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Tytuł:
DSPIC - Based impedance measuring instrument
Autorzy:
Santos, J.
Ramos, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/220477.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
impedance measurement
dsPIC
ADC
sine-fitting
Opis:
An implemented impedance measuring instrument is described in this paper. The device uses a dsPIC (Digital Signal Peripheral Interface Controller) as a processing unit, and a DDS (Direct Digital Synthesizer) to stimulate the measurement circuit composed by the reference impedance and the unknown impedance. The voltages across the impedances are amplified by programmable gain instrumentation amplifiers and then digitized by analog to digital converters. The impedance is measured by applying a seven-parameter sine-fitting algorithm to estimate the sine signal parameters. The dsPIC communicates through RS-232 or USB with a computer, where the measurement results can be analyzed. The device also has an LCD to display the measurement results.
Źródło:
Metrology and Measurement Systems; 2011, 18, 2; 185-198
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dos mitemas barrocos y una monja defensora de los negros (Yanga, Guadalupe y Sor Juana)
Autorzy:
Ramos, Raymundo
Powiązania:
https://bibliotekanauki.pl/articles/938146.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Źródło:
Revista del CESLA. International Latin American Studies Review; 2005, 7; 231-236
1641-4713
Pojawia się w:
Revista del CESLA. International Latin American Studies Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Capital punishment: a theoretical and cooperative analysis
Autorzy:
Ramos, Tainá Corrêa Barbosa
Powiązania:
https://bibliotekanauki.pl/articles/684936.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
capital punishment
theories of punishment
utilitarianism
retributivism
Opis:
Among all the different types of penalties that exist in the various juridical systems around the world, capital punishment, also known as the death penalty, is one of the most controversial ones. The discussion about its legitimacy and legality crosses social, philosophical, cultural, religious and historical fields. The present article aims to first analyze how capital punishment is treated in different parts of the world, whether it is present or not, and to later on focus on the attempts to justify such a harsh punishment, by both the retributive and utilitarian theories of punishment.
Źródło:
Adam Mickiewicz University Law Review; 2016, 6; 145-156
2450-0976
Pojawia się w:
Adam Mickiewicz University Law Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Railway geolocation and communication-management platforms
Autorzy:
Catalan Ramos, F.
Prieto Valderrey, I.
Hernandez Bajo, A.
Powiązania:
https://bibliotekanauki.pl/articles/393669.pdf
Data publikacji:
2009
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
kolej
zarządzanie
RENFE
railways
management
Opis:
The article gives a technical and functional description of the onboard tracking and communications-management platforms, as well as their associated control centres, supplied by GMV for the whole fleet of railway locomotives and motor cars of the Spanish railway operator RENFE.
Źródło:
Archives of Transport System Telematics; 2009, 2, 4; 31-36
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On roughness measurement by angular speckle correlation
Autorzy:
Salazar, F.
Belenguer, T.
García, J.
Ramos, G.
Powiązania:
https://bibliotekanauki.pl/articles/220643.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
roughness
speckle
non-destructive testing
Opis:
In this work, the influence of both characteristics of the lens and misalignment of the incident beams on roughness measurement is presented. To investigate how the focal length and diameter affect the degree of correlation between the speckle patterns, a set of experiments with different lenses is performed. On the other hand, the roughness when the beams separated by an amount are non-coincident at the same point on the sample is measured. To conclude the study, the uncertainty of the method is calculated.
Źródło:
Metrology and Measurement Systems; 2012, 19, 2; 373-380
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
When Reading Becomes a Game: Parallel Narratives in Portuguese Picturebooks
Autorzy:
Ramos, Ana Margarida
Powiązania:
https://bibliotekanauki.pl/articles/2031275.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Wrocławski. Oficyna Wydawnicza ATUT – Wrocławskie Wydawnictwo Oświatowe
Tematy:
postmodern picturebooks
wordless picturebooks
interactive reading
playfulness
metafiction
peritexts
Opis:
The aim of this text is to carry out an analysis of a specific picturebook type that includes two parallel narratives and can be read in two different directions. The first book under analysis, As duas estradas (2009) [Two Roads] (text by Isabel Minhós Martins), is organised using two verbal and visual narratives which tell the story of two partially simultaneous journeys in Portugal, from Lisbon to Alcobia doTejo, in two different cars by members of the same family. The second book, Olhe, por favor, não viu uma luzinha a piscar?/Corre, coelhinho, corre! (2013)[Follow the Firefly / Run, Rabbit, Run!], is a wordless picturebook that can be read in two directions, from left to right and from right to left, depicting two different visual narratives that take place in the same scenario, with different characters and specific plots. Highlighting the hybrid, multimodal and chamaeleon-like nature of the picturebook, our objective is to provide an opportunity to reflect upon this format of contemporary literature, which is in constant development and which allows increasingly more elaborate experimentation in order to stress the ludic or playful nature of picturebooks.
Źródło:
Filoteknos; 2020, 10; 345-357
2657-4810
Pojawia się w:
Filoteknos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR examination of free radicals thermally formed in vaselinum flavum
Autorzy:
Ramos, P.
Pilawa, B.
Powiązania:
https://bibliotekanauki.pl/articles/148032.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
vaselinum flavum
thermal sterilization
free radicals
EPR spectroscopy
Opis:
The popular pharmaceutical base used in pharmacy – vaselinum flavum – was studied by an X-band (9.3 GHz) EPR spectrometer in the range of microwave power of 2.2–70 mW. The samples were sterilized in hot air oven at temperatures: 160°C (120 min), 170°C (60 min), and 180°C (30 min). The aim of this work was to determine properties and free radical concentrations in vaselinum flavum thermally sterilized at different conditions. The changes in free radical system in vaselinum flavum during storage were analyzed. Free radicals were found in all the heated samples. The lowest free radical concentration was obtained for vaselinum flavum heated at 180°C for 30 min; so these parameters are proposed for the thermal sterilization of this pharmaceutical base. Interactions with oxygen decreased free radical concentration in vaselinum flavum during storage. Strong quenching of free radicals in vaselinum flavum was observed after 2 days for the samples sterilized at temperatures 160 and 180°C. Such an effect for vaselinum flavum heated at temperature 170°C was observed later, 13 days after sterilization. Fast spin-lattice relaxation processes exist in thermally sterilized vaselinum flavum. The EPR lines of heated vaselinum flavum were homogeneously broadened. EPR spectroscopy and its use for examining the thermal sterilization process in pharmacy was confirmed.
Źródło:
Nukleonika; 2015, 60, No. 3, part 1; 443-447
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From occupation to independence: contemporary East Timorese history and identity in Portuguese picturebooks
Autorzy:
Ramos, Ana Margarida
Powiązania:
https://bibliotekanauki.pl/articles/1388175.pdf
Data publikacji:
2016-05-29
Wydawca:
Uniwersytet Gdański. Wydawnictwo Uniwersytetu Gdańskiego
Tematy:
picturebooks
ideology
political
contemporary history
East Timor
Opis:
In Portugal, the suffering and struggle of the East Timorese people for independence started a social movement of solidarity with strong repercussions in the arts, namely music and literature. Children’s Literature depicted the theme of this period of oppression in East Timor, as well as the recognition of its independence and its right to freedom, in a picturebook selected for the White Ravens List in 2003 called East Timor – Island of the Rising Sun (2001), by João Pedro Mésseder and André Letria. This unusual picturebook, characterised by a very simple and sparse, almost poetic, text combined with large-format pictures, depicts this chapter of the contemporary history of East Timor in very specific way, resembling fairy tales or legends. The text and images are combined in order to promote symbolic readings, suggesting a magical/mystical environment that impresses readers. More than a decade later, recent struggles and stories from East Timor are still present in Portuguese picturebooks such as Lya/Lia (2014), by Margarida Botelho. The social change, path to democracy and educational development, as well as daily life and children’s pastimes are now the centre of a narrative that establishes the similarities and differences between modern-day Portugal and East Timor. Our aim is to analyse both the political and ideological perspectives present in these picturebooks aimed at very young readers, offering a broad vision of different realities and contexts, even when they deal with war, death and suffering, as was the case of the East Timorese fight for independence.
Źródło:
Problemy Wczesnej Edukacji; 2016, 34, 3; 58-68
1734-1582
2451-2230
Pojawia się w:
Problemy Wczesnej Edukacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The biological degradation of pure bone cement and bone cement with nanometals
Autorzy:
Świeczko-Żurek, Beata
Ramos, António
Żurek, Marcin
Pałubicka, Anna
Gajowiec, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/284131.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Źródło:
Engineering of Biomaterials; 2019, 22, no.153; 12
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Private Enforcement and Opt-out System Risks, Rewards and Legal Safeguards
Autorzy:
Ramos, Maria Elisabete
Powiązania:
https://bibliotekanauki.pl/articles/530274.pdf
Data publikacji:
2018-12-30
Wydawca:
Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
Tematy:
competition law
private enforcement
collective redress
opt-out system
Opis:
The EU Antitrust Damages Actions Directive does not include provisions for collective redress. Each EU member state is free to provide national regulation on this matter. The Portuguese legal system provided regulation on actio popularis since 1995. The ‘rational apathy’ of individual consumers may lead to non-reparation of damage and be of significant benefit for the company that is in breach of the law. The opt-out models solve the crucial economic problem caused by a large number of consumers or clients who have suffered a small loss because of competition law infringements. Under those circumstances, it is rational to be apathetic, because it can be foreseen that the cost of filing for compensatory damages will exceed the recovery obtained from the defendant. Such rational apathy of the parties injured by competition law infringements favours the wrongfully acting companies by not extracting their illegal gains from them. By not requiring the active consent of each of the claimants, the opt-out model is able to override rational apathy of consumers.
La Directive 2014/104/UE du Parlement Européen et du Conseil du 26 Novembre 2014 relative à certaines règles régissant les actions en dommages et intérêts en droit national pour les infractions aux dispositions du droit de la concurrence des États membres et de l’Union européenne n’offre pas des normes sur l’action collective. Chaque État-membre est libre d’adopter ses normes sur ce sujet. L’ordre juridique portugais prévoit des normes sur l’actio popularis, depuis 1995. L’apathie rationnelle de chaque consommateur peut déclencher la non réparation des dommages causés par l’infraction des normes de concurrence. Cet effet signifie un bénéfice pour les entreprises qui violent le droit de la concurrence.Le system opt-out donne la solution pour le problème causé pour des nombreux consommateurs qui souffrent des modestes dommages causés par des violations du droit de la concurrence. En ces situations, il est rationnel ne pas réagir, parce que les couts sont supérieurs aux bénéfices. Cette apathie rationnelle favorise les entreprises qui violent le droit de la concurrence. Le system opt-out est capable de surmonter les effets de l’apathie rationnel .
Źródło:
Yearbook of Antitrust and Regulatory Studies; 2018, 11(18); 85-114
1689-9024
2545-0115
Pojawia się w:
Yearbook of Antitrust and Regulatory Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variance components estimation in generalized orthogonal models
Autorzy:
Fernandes, Célia
Ramos, Paulo
Ferreira, Sandra
Mexia, João
Powiązania:
https://bibliotekanauki.pl/articles/729930.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
generalized orthogonal models
variance components
generalized cross nesting designs
Opis:
The model $y = ∑_{j=1}^w X_j β̲_j + e̲$ is generalized orthogonal if the orthogonal projection matrices on the range spaces of matrices $X_j$, j = 1, ..., w, commute. Unbiased estimators are obtained for the variance components of such models with cross-nesting.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2007, 27, 1-2; 99-115
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Turtle tracks from the Late Jurassic of Asturias, Spain
Autorzy:
Avanzini, M
Garcia-Ramos, J.C.
Lires, J.
Menegon, M.
Pinuela, L.
Fernandez, L.A.
Powiązania:
https://bibliotekanauki.pl/articles/20797.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Although tracks of dinosaurs are well known from Upper Jurassic sediments, tracks of non−dinosaurian vertebrates are fairly rare. The Upper Jurassic Lastres Formations of Asturias in northern Spain contain many vertebrate tracksites that include footprints and trackways of non−dinosaurian tetrapods. Several of these tracks are natural casts of pentadactyl to tridactyl footprints with digits connected by arched structures. The digits are short with deep scratch marks oriented anteriorly. The Asturian tracks show a high degree of morphological similarity to other specimens previously described as possible turtle tracks. Observations from extant turtle trackways show some surprising similarities with the fossil material. The tracks are here interpreted as having been made by turtles partially buoyed by water or by turtles walking in a slightly wet subaerial environment.
Źródło:
Acta Palaeontologica Polonica; 2005, 50, 4; 743-755
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algebraic structureof step nesting designs
Autorzy:
Fernandes, Célia
Ramos, Paulo
Mexia, João
Powiązania:
https://bibliotekanauki.pl/articles/729913.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
commutative Jordan algebras
cartesian product of commutative Jordan algebras
step nesting
variance components
UMVUE
Opis:
Step nesting designs may be very useful since they require fewer observations than the usual balanced nesting models. The number of treatments in balanced nesting design is the product of the number of levels in each factor. This number may be too large. As an alternative, in step nesting designs the number of treatments is the sum of the factor levels. Thus these models lead to a great economy and it is easy to carry out inference. To study the algebraic structure of step nesting designs we introduce the cartesian product of commutative Jordan algebras.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2010, 30, 2; 221-235
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sample partitioning estimation for ergodic diffusions: application to Ornstein-Uhlenbeck diffusion
Autorzy:
Ramos, Luís
Powiązania:
https://bibliotekanauki.pl/articles/729918.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
ergodic diffusions
martingale estimating functions
transition and invariant densities
maximum likelihood estimators
Opis:
When a diffusion is ergodic its transition density converges to its invariant density, see Durrett (1998). This convergence enabled us to introduce a sample partitioning technique that gives in each sub-sample, maximum likelihood estimators. The averages of these being a natural choice as estimators. To compare our estimators with the optimal we obtained from martingale estimating functions, see Sørensen (1998), we used the Ornstein-Uhlenbeck process for which exact simulations can be carried out.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2010, 30, 1; 117-122
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR studies of free radicals in thermally sterilized famotidine
Autorzy:
Ramos, P.
Pilawa, B.
Stroka, E.
Powiązania:
https://bibliotekanauki.pl/articles/148414.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
free radicals
thermal sterilization
famotidine
electron paramagnetic resonance (EPR) spectroscopy
Opis:
Free radicals formation in thermally sterilized famotidine was studied by the use of an X-band (9.3 GHz) electron paramagnetic resonance (EPR) spectroscopy. The influence of temperature and time of sterilization on free radicals generated in famotidine was determined. The best sterilization conditions for the tested drug were found. Sterilization was done according to the pharmaceutical norms at temperatures 160°C (120 min), 170°C (60 min), and 180°C (30 min). It was pointed out that the optimal temperature of thermal sterilization for famotidine was 170°C and time of heating 60 min in this conditions the lowest free radicals concentration was found. The highest free radicals concentration was measured in famotidine heated at 160°C during 120 min, the long time of sterilization is responsible for this effect. Free radicals concentration changes during storage of famotidine after thermal sterilization. Its value increased with storage time for the drug sterilized at both temperatures of 170°C and 180°C. Free radicals concentration decreases from 7 days after sterilization. Complex system of free radicals with the shape of EPR lines, dependent on microwave power exist in thermally sterilized famotidine. Slow spin-lattice relaxation processes, strong dipolar interactions characterize thermally sterilized famotidine. Microwave saturation indicates that EPR lines of famotidine are homogeneously broadened. The usefulness of EPR spectroscopy to examine of the sterilized drugs was evaluated.
Źródło:
Nukleonika; 2013, 58, 3; 413-418
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A framing theory empirical approach to the image of elderly population in the digital press of Castilla y León
Autorzy:
Antón Crespo, Margatia
Fernánandez Ramos, María Yolanda
Powiązania:
https://bibliotekanauki.pl/articles/666540.pdf
Data publikacji:
2016
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Opis:
Abstract: A framing theory empirical approach to the image of elderly population in the digital press of Castilla y León             The present paper shows the results of content analysis research conducted on media framing related to the third age population published by the most widespread online media in Castilla y León. This paper focuses on the analysis of the role of regional press when framing one of the oldest age groups both in Spain and in Europe; for this purpose, 799 pieces of news about the third age population were analyzed in several genres within the most widespread online formats throughout the region. For our goal Semetko and Valkenburg’s five news frames were analyzed in order to identify the latency and subjectivity of discourse in each of the pieces of news.  Keywords: mass media, news framing, content analysis, third-age populations.
Źródło:
Studia Politicae Universitatis Silesiensis; 2016, 17
1895-3492
2353-9747
Pojawia się w:
Studia Politicae Universitatis Silesiensis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Esteba Ramos, Diana, Grammaire, lexicographie et littérature espagnole: catalogue du fonds ancien de la Bibliothèque Nationale et Universitaire de Strasbourg (XVIE-XVIIE siècles)
Autorzy:
Núñez, Luis Pablo
Powiązania:
https://bibliotekanauki.pl/articles/2080920.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warszawski. Wydział Neofilologii
Źródło:
Itinerarios; 2016, 24; 333-335
1507-7241
Pojawia się w:
Itinerarios
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of microwave power on EPR spectra of thermally sterilized eucerinum anhydricum
Autorzy:
Ramos, P.
Pepliński, P.
Pilawa, B.
Powiązania:
https://bibliotekanauki.pl/articles/148715.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
EPR
microwave saturation
free radicals
eucerinum anhydricum
thermal sterilization
Opis:
Free radicals formed during thermal sterilization of eucerinum anhydricum – the pharmaceutical base were examined by an X-band (9.3 GHz) spectrometer. Eucerinum anhydricum was sterilized at different physical conditions according to the Polish Pharmacopeia norms. The samples were heated at temperatures: 160°C (120 min), 170°C (60 min), and 180°C (30 min). The aim of this study is to compare free radical concentration and effect of microwave power on EPR spectra of eucerinum anhydricum base thermally sterilized at different temperatures and periods of time. The effect of time storage on the free radicals in the heated samples was tested. Free radical concentrations in the sample stored 15 min strongly decreased with the increasing of sterilization temperature, probably as the result of recombination. Storage caused strong decrease of free radical concentrations in the samples, probably as the result of interactions with oxygen. It was observed to be independent of sterilization conditions from 2 days of storage and longer. Because of the lowest free radical concentration, for eucerinum anhydricum thermal sterilization at 180°C for 30 min is recommended. The sterilized samples should be stored at inert atmosphere without oxygen molecules. Fast spin-lattice relaxation processes existed in sterilized eucerinum anhydricum. The character of changes of amplitudes and linewidths of EPR lines with increasing of microwave power was the same for different storage times. The parameters of thermal sterilization and storage time influenced free radical concentration in eucerinum anhydricum, but magnetic spin-lattice interactions were unchanged. The usefulness of EPR spectroscopy in optimization of thermal sterilization process of eucerinum anhydricum was confirmed.
Źródło:
Nukleonika; 2015, 60, No. 3, part 1; 439-442
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of bovine serum albumin glycated with glucose, galactose and lactose
Autorzy:
Ledesma-Osuna, Ana
Ramos-Clamont, Gabriela
Vázquez-Moreno, Luz
Powiązania:
https://bibliotekanauki.pl/articles/1040702.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
bovine serum albumin glycoconjugates
Maillard reaction
glycation
Opis:
The non-enzymatic reaction between reducing sugars and proteins, known as glycation, has received increased attention from nutritional and medical research. In addition, there is a large interest in obtaining glycoconjugates of pure well-characterized oligosaccharides for biological research. In this study, glycation of bovine serum albumin (BSA) by d-glucose, d-galactose and d-lactose under dry-heat at 60°C for 30, 60, 120, 180 or 240 min was assessed and the glycated products studied in order to establish their biological recognition by lectins. BSA glycation was monitored using gel electrophoresis, determination of available amino groups and lectin binding assays. The BSA molecular mass increase and glycation sites were investigated by mass spectrometry and through digestion with trypsin and chymotrypsin. Depending on time and type of sugar, differences in BSA conjugation were achieved. Modified BSA revealed reduction of amino groups' availability and slower migration through SDS/PAGE. d-galactose was more reactive than d-glucose or d-lactose, leading to the coupling of 10, 3 and 1 sugar residues, respectively, after 120 minutes of reaction. BSA lysines (K) were the preferred modified amino acids; both K256 and K420 appeared the most available for conjugation. Only BSA-lactose showed biological recognition by specific lectins.
Źródło:
Acta Biochimica Polonica; 2008, 55, 3; 491-497
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency Container Ports in Brazil: A DEA and FDH Approach
Autorzy:
Cabral, Alexandra Maria Rios
Ramos, Francisco S.
Powiązania:
https://bibliotekanauki.pl/articles/14476432.pdf
Data publikacji:
2018-03-15
Wydawca:
Wyższa Szkoła Bankowa we Wrocławiu
Tematy:
DEA
FDH
container terminal
Brazilian ports
port efficiency
technical efficiency
Opis:
Aim: This study aims to evaluate the technical efficiency of 44 Brazilian port terminals that handled containers in 2016. The evaluation will first proceed by identifying the main benchmarks. It will then provide an analysis of variables that may have an effect on technical efficiency as well as the nature of their relationship with the latter--namely: container movement and specialized terminals.   Design / Research methods: In this work we apply the techniques of Data Envelopment Analysis and Free Disposal Hull. Output-oriented models were constructed, using three inputs - berth depth, berth length and number of berths, and three outputs - number of containers handled, medium board measured in container handled per hour of mooring, and medium consignment rate measured in container throughput per ship.   Conclusions / findings: The main results show that half of the terminals have an inefficient infrastructure, with capacity larger than necessary to meet current demand for transportation of containers. In addition, there is a strong relationship between the efficiency and size of a terminal port and between the efficiency and degree of specialization. Moreover, the private use terminal of (TUP) Itacal and public quay OCRIM can serve as benchmarks for most of the terminals.   Originality / value of the article: Relatively few works in the literature tried to measure technical efficiency for developing countries. Besides that, none of the works found regarding Brazilian ports have shown the scenario after promulgation of the Port’s Law in 2013, and only a few used container cargo as focus. This article is of interest for scientists of the sector, exporters/importers, and Brazilian Government officers interested in observing the effects of public policies aimed at the sector. We also suggest future work concerning the sector's improvements which can follow from our findings. 
Źródło:
Central European Review of Economics and Management; 2018, 2, 1; 43-64
2543-9472
Pojawia się w:
Central European Review of Economics and Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of microwave power on EPR spectra of natural and synthetic dental biocompatible materials
Autorzy:
Adamczyk, J.
Ramos, P.
Pilawa, B.
Powiązania:
https://bibliotekanauki.pl/articles/147235.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
EPR
microwave saturation
paramagnetic centers
dental biocompatible materials
Opis:
Paramagnetic centers in the two exemplary synthetic and natural dental biocompatible materials applied in implantology were examined by the use of an X-band (9.3 GHz) electron paramagnetic resonance (EPR) spectroscopy. The EPR spectra were measured in the range of microwave power 2.2–70 mW. The aims of this work were to compare paramagnetic centers concentrations in different dental biocompatible materials and to determine the effect of microwave power on parameters of their EPR spectra. It is the very fi rst and innovatory examination of paramagnetic centers in these materials. It was pointed out that paramagnetic centers existed in both natural (~1018 spin/g) and synthetic (~1019 spin/g) dental biocompatible materials, but the lower free radical concentration characterized the natural sample. Continuous microwave saturation of EPR spectra indicated that faster spin-lattice relaxation processes existed in synthetic dental biocompatible materials than in natural material. Linewidths (ΔBpp) of the EPR spectra of the natural dental material slightly increased for the higher microwave powers. Such effect was not observed for the synthetic material. The broad EPR lines (ΔBpp): 2.4 mT, 3.9 mT, were measured for the natural and synthetic dental materials, respectively. Probably strong dipolar interactions between paramagnetic centers in the studied samples may be responsible for their line broadening. EPR spectroscopy is the useful experimental method in the examination of paramagnetic centers in dental biocompatible materials.
Źródło:
Nukleonika; 2015, 60, No. 3, part 1; 449-453
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of biological sensors appearance with ARIMA models as a tool for Integrated Pest Management protocols
Autorzy:
Fernandez-Gonzalez, M.
Ramos-Valcarcel, D.
Aira, M.J.
Rodriguez-Rajo, F.J.
Powiązania:
https://bibliotekanauki.pl/articles/50204.pdf
Data publikacji:
2016
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2016, 23, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Real Time PC Implementation of Power Quality Monitoring System Based on Multiharmonic Least-Squares Fitting
Autorzy:
Ardeleanu, A. S.
Ramos, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/220586.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power quality
real time
multiharmonic least-squares fitting
Opis:
In this paper, an algorithm that monitors the power system to detect and classify power quality events in real time is presented. The algorithm is able to detect events caused by waveform distortions and variations of the RMS values of the voltage. Detection of the RMS events is done by comparing the RMS values with certain thresholds, while detection of waveform distortions is made using an algorithm based on multiharmonic leasts-squares fitting.
Źródło:
Metrology and Measurement Systems; 2011, 18, 4; 543-554
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Abstract metaphorical classes: A perspective from distributed models of conceptual representations
Autorzy:
Khatin-Zadeh, Omid
Eskandari, Zahra
Banaruee, Hassan
Marmolejo-Ramos, Fernando
Powiązania:
https://bibliotekanauki.pl/articles/2129703.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
distributed models
abstract concepts
concrete concepts
metaphorical class
Opis:
This article looks at the semantic space of abstract and concrete concepts from the perspective of distributed models of conceptual representations. It focuses on abstract metaphorical classes and the mechanisms through which these concepts are processed. When the metaphor X is a Y is understood, X is included in the abstract metaphorical class of Y. This metaphorical class is abstract because the most of semantic features of Y are filtered out through a suppressive-oriented mode of processing. It is suggested that abstract metaphorical classes of living things are usually defined by a single or a very small set of semantic features. Therefore, such metaphorical classes are highly abstract. On the other hand, abstract metaphorical classes of nonliving things are defined by a relatively larger cluster of semantic features. Therefore, abstract metaphorical classes of nonliving things have a relatively higher degree of concreteness compared to those of living things. In other words, abstract metaphorical classes of living things and nonliving things are rather different in terms of nature and the structure of semantic space.
Źródło:
Polish Psychological Bulletin; 2019, 50, 2; 108-113
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR study of free radicals formed in fusidic acid and neomycin under UV irradiation
Autorzy:
Pierzchała, Ewa
Ramos, Paweł
Pilawa, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/895647.pdf
Data publikacji:
2019-04-30
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
free radicals
EPR spectroscopy
Dermatology
UV irradiation
fusidic acid
neomycin
Opis:
Free radicals in UV irradiated antibiotics used in dermatology were examined. Concentrations of free radicals in fusidic acid and neomycin, were determined. EPR spectra of the tested antibiotics were measured by electron paramagnetic resonance spectrometer with magnetic modulation of 100 kHz and numerical acquisition system the Rapid Scan Unit. The influence of microwave powers in the range of 2.2-70 mW on the spectra was obtained. Amplitudes (A) and linewidths (ΔBpp) of the EPR spectra, were analysed. The EPR spectra were homogeneously broadened. Fast spin-lattice relaxation processes existed in UV irradiated fusidic acid and neomycin, which EPR spectra were not saturated up to 70 mW. The influence of the time of UV irradiation on free radicals in the samples was observed. The samples were irradiated by UVA (315-400 nm) in the 30, 60, and 90 minute period. Free radical concentrations in the tested antibiotics exposed to UV were proportional to the amplitudes (A) of the EPR spectra. The highest amplitudes (A) were observed for the UV irradiated antibiotics during 60 minutes. The higher amplitudes (A) characterized fusidic acid than neomycin. Fusidic acid and neomycin used to treat bacterial infection of skin under UV irradiation may produce free radical toxic effects. The stronger photosensitivity characterized fusidic acid relatively to neomycin. EPR spectroscopy is the useful method to examine free radicals formed in antibiotics during photolysis.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 2; 215-223
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impurity-Related Nonlinear Optical Absorption in Delta-Doped Quantum Rings
Autorzy:
Restrepo, R.
Martínez-Orozco, J.
Barseghyan, M.
Mora-Ramos, M.
Duque, C.
Powiązania:
https://bibliotekanauki.pl/articles/1195152.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.-k
73.21.-b
78.67.-n
Opis:
Using a variational procedure within the effective mass approximation, we have calculated the hydrogenic impurity binding energy as well as the impurity-related nonlinear optical absorption in a single quantum ring with axial n-type delta-doping. The delta-like potential along the z-direction is analytically modeled with a Hartree-like confining profile fitted to a one-dimensional Thomas-Fermi-based potential in the local density approximation. Both on-center and on-edge impurity positions are considered and the energies of the impurity states are examined as functions of the vertical size of the ring. It is found that the effect of changes in the geometry of the quantum ring leads to a shifting of the resonant peaks of the intra-band optical spectrum.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 245-247
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania Rhizoma calami metodą EPR
EPR studies of Rhizoma calami
Autorzy:
Pawłowska-Góral, K.
Kurzeja, E.
Pilawa, B.
Ramos, P.
Powiązania:
https://bibliotekanauki.pl/articles/284544.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
Rhizoma calami
sterylizacja
wolne rodniki
spektroskopia EPR
sterilization
free radicals
EPR spectroscopy
Opis:
Przeprowadzono badania Rhizoma calami z zastosowaniem spektroskopii elektronowego rezonansu paramagnetycznego (EPR) na pasmo X (9.3 GHz). Porównano koncentrację i właściwości centrów paramagnetycznych w próbkach wyjściowych oraz sterylizowanych parą wodną. Wykazano, że wolne rodniki występują w obydwu badanych próbkach roślinnych. Ciągłe nasycenie mikrofalowe linii EPR wykazało jednorodne rozmieszczenie wolnych rodników oraz wolne procesy relaksacji spin-sieć w Rhizoma calami.
Rhizoma calami was examined by electron paramagnetic resonance (EPR) spectroscopy at X-band (9.3 GHz). Concentration and properties of paramagnetic centers in the original sample and sample sterilized by water vapour were compared. It was stated that free radicals exist in both the studied plant samples. Continuous microwave saturation of EPR lines proved homogeneous distribution of free radicals and slow spin-lattice relaxation processes in Rhizoma calami.
Źródło:
Engineering of Biomaterials; 2009, 12, no. 89-91; 160-162
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Repetition. A journey to the limits of the matrix
Powtórzenie. Podróż do granic matrycy
Autorzy:
Ramos Guadix, Juan Carlos
Powiązania:
https://bibliotekanauki.pl/articles/293726.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Kierkegaard Søren Aabye
repetition
matrix
print
intaglio printmaking
mimesis
powtórzenie
matryca
druk
intaglio
Opis:
This paper presents Søren Kierkegaard’s concept of repetition and attempts to draw an analogy between it and intaglio printmaking, in relation to three welldifferentiated moments. The first moment is the location of repetition in the context of individual existence and its relationship with the matrix as a unique thing. The second, its demanding nature, its search for freedom, where the question of printing is understood as the progress and process of transfer. In this stage repetition becomes an instantaneous demand and vindication. Thirdly, the paper analyses the relationship between repetition as a life event and the print as the process of appropriating a story by means of a graphic act. Here the analogy is drawn between the concept of repetition by Kierkegaard and the concept of repetition in the two completely opposing realities that comprise the natural reality of intaglio printmaking; the matrix and the print.
Autor artykułu przedstawia koncepcje powtórzenia Sørena Kierkegaarda, próbując nakreślić analogię między nią a grafiką intaglio (grafiką wklęsłodrukową) w odniesieniu do trzech różniących się od siebie momentów. Pierwszym z nich jest relacja powtórzenia wobec układu odniesienia, jakim jest indywidualna egzystencja i jej związek z matrycą jako bytem wyjątkowym. Po drugie, ponieważ w jego charakterze leży kategoryczny postulat wolności, który porusza kwestie drukowania jako procesu postępu i przekazu. Na tym etapie powtórzenie jest natychmiastowym żądaniem i realizacją. Na koniec analizowany jest związek między powtórzeniem jako wydarzeniem istnienia a drukiem jako procesem zawłaszczenia historii przez istnienie aktu graficznego. W tym kontekście autor zamierza ustanowić analogię między koncepcją powtórzenia Kierkegaarda a koncepcją powtórzenia dwóch całkowicie przeciwnych rzeczywistości, które składają się na naturalną rzeczywistość miedziorytu i systemów drukowania, takich jak matryca i druk.
Źródło:
Architectus; 2019, 3 (59); 19-22
1429-7507
2084-5227
Pojawia się w:
Architectus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algebraic structure for the crossing of balanced and stair nested designs
Autorzy:
Fernandes, Célia
Ramos, Paulo
Mexia, João
Powiązania:
https://bibliotekanauki.pl/articles/729814.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
balanced nested designs
stair nested designs
crossing
commutative Jordan algebras
variance components
inference
Opis:
Stair nesting allows us to work with fewer observations than the most usual form of nesting, the balanced nesting. In the case of stair nesting the amount of information for the different factors is more evenly distributed. This new design leads to greater economy, because we can work with fewer observations. In this work we present the algebraic structure of the cross of balanced nested and stair nested designs, using binary operations on commutative Jordan algebras. This new cross requires fewer observations than the usual cross balanced nested designs and it is easy to carry out inference.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2014, 34, 1-2; 71-88
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Network for EPR spectroscopic analysis as a tool in didactic process
Autorzy:
Bernaś, M.
Ramos, P.
Powiązania:
https://bibliotekanauki.pl/articles/332960.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
interoperacyjne urządzenia medyczne
zdalne szkolenia
algorytm najmniejszego błędu średniokwadratowego
medical devices interoperability
remote training
LMS
Opis:
The paper deals with a new training technologies' development based on distance learning web–services, implemented for laboratory of a Pharmacy Study branch at Medical University in Katowice. The discussed computing interfaces allow students to perform analysis of free radicals' spectra provided by EPR device. These training facilities are now available at home; at their remote terminal. The training resources consist of electronic ⁄ computer based training. The laboratory provide the students with an interface incorporated into simulation packages along with statistic apparatus for data analysis. The dynamically configured application provide the user with his individual set of training samples. Additionally it provides a valuable skill training for students, otherwise available only as part of master ofscience thesis work.
Źródło:
Journal of Medical Informatics & Technologies; 2010, 16; 77-82
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cloud Computing and Distance Learning in Computer Science
Chmura obliczeniowa i kształcenie na odległość w informatyce
Autorzy:
Brandao, Pedro Ramos
Powiązania:
https://bibliotekanauki.pl/articles/1365796.pdf
Data publikacji:
2020-12-29
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
Cloud Computing
Azure
nauczanie na odległość
WEB App
Virtual Labs
DevOps.
distance learning
Opis:
This work demonstrates that the use of laboratories for the development of curricular work in the area of information technology exclusively supported by cloud computing technology does not decrease the level of learning and assessment objects on the part of students. This scenario arose from the need to interrupt face-to-face classes in physical laboratories due to the COVID-19 Pandemic.
Z niniejszej pracy wynika, że wykorzystanie laboratoriów do opracowywania zajęć dydaktycznych w zakresie technologii informatycznych wspomaganych wyłącznie technologią przetwarzania w chmurze nie obniża poziomu uczenia się i obiektów oceniania po stronie studentów. Ten scenariusz powstał z potrzeby przerwania bezpośrednich zajęć tradycyjnych w laboratoriach fizycznych z powodu pandemii COVID-19.
Źródło:
International Journal of Research in E-learning IJREL; 2020, 6, 2; 1-20
2451-2583
2543-6155
Pojawia się w:
International Journal of Research in E-learning IJREL
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wolne rodniki w sterylizowanym termicznie verapamilu
Free radicals in thermally sterilized verapamil
Autorzy:
Ramos, P.
Pepliński, P.
Pilawa, B.
Powiązania:
https://bibliotekanauki.pl/articles/285536.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
werapamil
sterylizacja termiczna
wolne rodniki
spektroskopia EPR
verapamil
thermal sterilization
free radicals
EPR spectroscopy
Opis:
Zbadano generowanie wolnych rodników w werapamilu podczas sterylizacji termiczne w temperaturze 180 stopni C. Koncentrację i właściwości wolnych rodników analizowano z zastosowaniem spektroskopii elektronowego rezonansu paramagnetycznego (EPR) na pasmo X (9.3 GHz). Wykazano, że w procesie sterylizacji termicznej powstają w werapamilu stabilne wolne rodniki. Wolne procesy relaksacji spin-sieć oraz silne oddziaływania dipolowe występują w werapamilu. Badania metodą EPR wykazały, że sterylizacja wysokotemperaturowa nie jest zalecana dla werapamilu.
Free radical formation in verapamil during thermal sterilization at temperature 180 degrees of C was studied. Concentration and properties of free radicals were examined by the use of electron paramagnetic resonance (EPR) spectroscopy at X-band (9.3GHz). It was stated that stable free radicals are formed during thermal sterilization of verapamil. Slow spin-lattice relaxation processes and strong dipolar interactions exist in verapamil.EPR studies showed that sterilization at high temperature is not recommended for verapamil.
Źródło:
Engineering of Biomaterials; 2009, 12, no. 89-91; 163-165
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of seawater main components on frothability in the flotation of Cu-Mo sulfide ore
Autorzy:
Laskowski, J. S.
Castro, S.
Ramos, O.
Powiązania:
https://bibliotekanauki.pl/articles/109747.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
seawater
froth stability
Cu-Mo flotation
magnesium ions
molybdenite flotation
Opis:
The main problem in the flotation of Cu-Mo sulfide ores in seawater is poor floatability of molybdenite at pH>9.5. Froth stability plays a very important role in determining concentrate grade and recovery in flotation operations and in this paper both floatability and frothability have been tested. The frothability have been studied by measuring froth equilibrium layer thickness in a modified laboratory flotation cell. Two chemical aspects of seawater need to be considered: the content of NaCl (around 87% of salinity), and the concentration of secondary ions (around 13%) (sulfate, magnesium, calcium, bicarbonate ions, etc.). Seawater, NaCl solutions, and seawater’s ions were found to depress frothability. The effect of pH on frothability over the pH range from 9.5 to 11, which is very strong in freshwater, becomes negligible in seawater and the tested electrolyte solutions. The analysis of the relationship between the mechanisms of molybdenite depression and the loss of frothability in seawater implies that the effects of the studied ions on molybdenite floatability and on pulp frothability are different. While depression of molybdenite floatability could be tracked down to magnesium hydroxide precipitation as a main culprit, the depression of frothability is a much more complicated issue.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 1; 17-29
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnitude Modelling of HRTF Using Principal Component Analysis Applied to Complex Values
Autorzy:
Ramos, O. A.
Tommasini, F. C.
Powiązania:
https://bibliotekanauki.pl/articles/177682.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
head related transfer functions
HRTF
principal components analysis
PCA
binaural audition
auditory perception
Opis:
Principal components analysis (PCA) is frequently used for modelling the magnitude of the head- related transfer functions (HRTFs). Assuming that the HRTFs are minimum phase systems, the phase is obtained from the Hilbert transform of the log-magnitude. In recent years, the PCA applied to HRTFs is also used to model individual HRTFs relating the PCA weights with anthropometric measurements of the head, torso and pinnae. The HRTF log-magnitude is the most used format of input data to the PCA, but it has been shown that if the input data is HRTF linear magnitude, the cumulative variance converges faster, and the mean square error (MSE) is smaller. This study demonstrates that PCA applied directly on HRTF complex values is even better than the two formats mentioned above, that is, the MSE is the smallest and the cumulative variance converges faster after the 8th principal component. Different objective experiments around all the median plane put in evidence the differences which, although small, seem to be perceptually detectable. To elucidate this point, psychoacoustic discrimination tests are done between measured and reconstructed HRTFs from the three types of input data mentioned, in the median plane between −45◦ and +90◦.
Źródło:
Archives of Acoustics; 2014, 39, 4; 477-482
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parasitological surveillance in a rat (Rattus norvegicus) colony in Sao Paulo Zoo animal house
Autorzy:
Chagas, Carolina Romeiro Fernandes
Gonzalez, Irys Hany Lima
Favoretto, Samantha Mesquita
Ramos, Patrícia Locosque
Powiązania:
https://bibliotekanauki.pl/articles/972176.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
protozoa
helminth
zoos
Rattus norvegicus
Opis:
Rattus norvegicus (Mammalia: Rodentia) is a widespread and synanthropic rodent, broadly used in medical experiments. It can also be used for feeding captive animals in zoos. Parasitological surveys are important to guarantee the health of both the animals and the staff responsible for their management. The aim of this study was to identify intestinal parasites of Rattus norvegicus offered as food to captive animals from São Paulo Zoo, and demonstrate the importance of sanitary hurdling, disease control and biosecurity. The identified protozoan parasites were Eimeria sp., Entamoeba sp., Spironucleus sp., Giardia sp., Tritrichomonas sp., Chilomastix sp., unidentified cysts and non-sporulated coccidians oocysts (Isospora/Eimeria). The following helminths were found: Syphacia muris, Rodentolepis nana and Aspiculuris tetraptera.
Źródło:
Annals of Parasitology; 2017, 63, 4; 291-297
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Novel System Architecture for an Improved Self-care Solution – Conceptual Design and Key Components
Autorzy:
Santos, Patrick
Ramos, Jorge
Seabra, Eduardo
Castro, José
Powiązania:
https://bibliotekanauki.pl/articles/1839314.pdf
Data publikacji:
2020
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
adaptive interfaces
big data analytics
data mining
user profiling
Opis:
The high penetration rate that mobile devices enjoy in to day’s society has facilitated the creation of new digital services, with those offered by operators and content providers standing out. However, even this has failed to encourage consumers to express positive opinions on telecommunication services, especially when compared with other sectors. One of the main reasons of the mistrust shown is the low level of quality of customer service provided an area that generates high costs for the operators themselves, due to the high number of people employed at call centers in order to handle the volume of calls received. To face these challenges, operators launched self-care applications in order to provide customers with a tool that would allow them to autonomously manage the services they have subscribed. In this paper, we present an architecture that provides customized information to customers – a solution that is separate from mobile operating systems and communication technologies.
Źródło:
Journal of Telecommunications and Information Technology; 2020, 4; 88-97
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
El indigenismo en México como racismo de Estado: mestizaje asimilacionista y esterilización forzada
Autorzy:
Pedraza Ramos, Alejandro Karin
Powiązania:
https://bibliotekanauki.pl/articles/1186537.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Warszawski. Wydział Neofilologii
Tematy:
indigenismo
racismo de Estado
esterilización forzada
mestizaje
discriminación
indigenism
State racism
forced sterilization
miscegenation
discrimination
Opis:
En este trabajo se exploran diferentes dimensiones del racismo, para construir una categoría de racismo de Estado que permita analizar el dispositivo indigenista con un objetivo doble: primero, exponer los esfuerzos por sistematizar las teorías y prácticas racistas que fundamentan la intervención organizada y regulada sobre la población indígena. Segundo, mostrar cómo, a pesar de que las políticas indigenistas se han modifi cado sustancialmente, el racismo de Estado subsiste, no tanto por sus formas –que en buena medida se ocultan–, sino por sus fundamentos y objetivos, es decir: la discriminación, subordinación, egregación, explotación, despojo y exterminio de las etnias culturalmente diferenciadas. Para ello se analizan dos dispositivos paradigmáticos de las políticas indigenistas: el mestizaje asimilacionista y la esterilización forzada.
Źródło:
Itinerarios; 2019, 29; 215-236
1507-7241
Pojawia się w:
Itinerarios
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ukraine in Transformation. From Soviet Republic to European Society [Украина в трансформации. От советской республики до европейского общества], eds. A. Veira-Ramos, T. Liubyva, E. Golovakha, Palgrave Macmillan, Cham 2020, ss. 282
Autorzy:
Pietrasik, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/1934097.pdf
Data publikacji:
2021-12-31
Wydawca:
Wydawnictwo Adam Marszałek
Źródło:
Studia Orientalne; 2021, 2(20); 218-223
2299-1999
Pojawia się w:
Studia Orientalne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Double-Donor Energy Structure in Concentric Quantum Rings under Magnetic Field and Hydrostatic Pressure
Autorzy:
Fulla, M.
Marín, J.
Londoño, D.
Duque, C.
Mora-Ramos, M.
Powiązania:
https://bibliotekanauki.pl/articles/1194836.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Eq
73.20.Hb
73.21.La
Opis:
A model for an artificial hydrogen molecule consisting of two positive on-axis Coulombic centers and two electrons coupled to them inside a double concentric quantum ring is considered. Such a nanostructure is assumed to be under the influence of external probes like hydrostatic pressure and magnetic field. By using the adiabatic approximation, the ground state energy is calculated as a function of the outer center line radius and the impurity Coulombic center separation, for different values of the hydrostatic pressure and magnetic field strength. In contrast to the single properties imposed by nature on the actual hydrogen molecule, our model allows us to explore a great variety of properties of the artificial hydrogen molecule by changing the ring dimensions. The artificial hydrogen molecule energy structure may be tuned by changing the external field strengths.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 220-223
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear Optical Rectification and Second Harmonic Generation in 2D Quantum Rings under Electric Field and Magnetic Fields
Autorzy:
Morales, A.
Mora-Ramos, M.
Duque, C.
Powiązania:
https://bibliotekanauki.pl/articles/1195016.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.-k
73.21.-b
78.67.-n
Opis:
By using the effective mass and parabolic band approximations, the nonlinear optical rectification and the second harmonic generation are calculated in a two-dimensional quantum ring under the simultaneous effects of perpendicularly applied magnetic field and in-plane applied electric field. The geometry of the ring is modeled via the combined influences of a parabolic and inverse square confining potentials. The exact solutions for the two-dimensional motion of the conduction band electrons are used as the basis for a perturbation-theory treatment of the static electric field effect. The variation of one of the different potential energy parameters, for a fixed configuration of the remaining ones, leads to either blueshifts or redshifts of the resonant peaks as well as to distinct rates of change for their amplitudes.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 195-197
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Responses in Asymmetric Inverse Parabolic Quantum Wells: Effects of Laser Fields and Hydrostatic Pressure
Autorzy:
Mora-Ramos, M.
Morales, A.
Duque, C.
Powiązania:
https://bibliotekanauki.pl/articles/1207558.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.-k
73.63.Hs
73.21.-b
74.25.Gz
Opis:
We report the theoretical calculation of the electronic states in a $Al_{x}Ga_{1-x}As$-based quantum well with inverse parabolic confinement under the combined effects of the intense laser field and hydrostatic pressure. Calculations are in the effective mass and parabolic band approximations and using a variational procedure and the so-called Floquet method in order to obtain the energies and wave functions for the conduction band states. We use the obtained information to investigate the intersubband-related nonlinear optical absorption and optical rectification coefficients.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 202-204
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$D_2^+$ Molecular Complex in Ring-Like Nanostructures: Hydrostatic Pressure and Electromagnetic Field Effects
Autorzy:
Fulla, M.
Marín, J.
Gutiérrez, W.
Duque, C.
Mora-Ramos, M.
Powiązania:
https://bibliotekanauki.pl/articles/1215648.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Eq
73.20.Hb
73.21.La
Opis:
In this work we investigate the energy states in a $D_2^+$ complex formed by the coupling of a conduction band electron and two donor centers in a quantum ring with rectangular cross-section. The influences of externally applied probes like electric and magnetic fields and hydrostatic pressure together with the change in the relative position between the two Coulombic centers are particularly studied, highlighting the important contribution of the repulsive inter-center interaction. The destruction of the Aharonov-Bohm oscillations of the ground state associated with the localization of the electron states in the system is discussed.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 241-244
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Właściwości paramagnetyczne biomateriałów
Paramagnetic properties of biomaterials
Autorzy:
Pilawa, B.
Adamczyk, J.
Zdybel, M.
Wilczyński, S.
Ramos, P.
Czyżyk, D.
Kościelniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/283897.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
biomateriały
paramagnetyzm
centra paramagnetyczne
wolne rodniki
EPR
biomaterials
paramagnetism
paramagnetic centers
free radicals
Opis:
Paramagnetyczne biomateriały mogą być wysoce reaktywne oraz mogą ulegać destrukcji w wyniku reakcji wolnorodnikowych. W pracy przedstawiono znane z literatury naukowej badania właściwości paramagnetycznych biomateriałów z zastosowaniem spektroskopii elektronowego rezonansu paramagnetycznego (EPR). Wskazano także paramagnetyczne biomateriały, które nie były dotąd analizowane metodą EPR.
Paramagnetic biomaterials may be very reactive and they may be destroyed by free radical reactions. In this work the known from scientific publications electron paramagnetic resonance (EPR) studies of paramagnetic properties of biomaterials are presented. Unexamined by EPR paramagnetic biomaterials were also described.
Źródło:
Engineering of Biomaterials; 2009, 12, no. 89-91; 166-168
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Spectral Subtraction Based Algorithm for Real-time Noise Cancellation with Application to Gunshot Acoustics
Autorzy:
Ramos, A. L. L.
Holm, S.
Gudvangen, S.
Otterlei, R.
Powiązania:
https://bibliotekanauki.pl/articles/226624.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gunshot acoustics
noise cancellation
spectral suppression
counter sniper systems
Opis:
This paper introduces an improved spectral subtraction based algorithm for real-time noise cancellation, applied to gunshot acoustical signals. The derivation is based on the fact that, in practice, relatively long periods without gunshot signals occur and the background noise can be modeled as being short-time stationary and uncorrelated to the impulsive gunshot signals. Moreover, gunshot signals, in general, have a spiky autocorrelation while typical vehicle noise, or related, is periodic and exhibits a wider autocorrelation. The Spectral Suppression algorithm is applied using the pre-filtering approach, as opposed to post-filtering which requires a priori knowledge of the direction of arrival of the signals of interest, namely, the Muzzle blast and the Shockwave. The results presented in this work are based on a dataset generated by combining signals from real gunshots and real vehicle noise.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 1; 93-98
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the use of multi-harmonic least-squares fitting for THD estimation in power quality analysis
Autorzy:
Ramos, P. M.
Janeiro, F. M.
Radil, T.
Powiązania:
https://bibliotekanauki.pl/articles/220641.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
harmonic analysis
power quality
signal reconstruction
spectral analysis
harmonic distortion
Opis:
The quality of the supplied power by electricity utilities is regulated and of concern to the end user. Power quality disturbances include interruptions, sags, swells, transients and harmonic distortion. The instruments used to measure these disturbances have to satisfy minimum requirements set by international standards. In this paper, an analysis of multi-harmonic least-squares fitting algorithms applied to total harmonic distortion (THD) estimation is presented. The results from the different least-squares algorithms are compared with the results from the discrete Fourier transform (DFT) algorithm. The algorithms are assessed in the different testing states required by the standards.
Źródło:
Metrology and Measurement Systems; 2012, 19, 2; 295-306
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Transmission of the Agnus Castus Herbal: From Manuscript to Early Print
Autorzy:
Esteve-Ramos, María José
Powiązania:
https://bibliotekanauki.pl/articles/2084579.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
manuscripts
Agnus Castus Herbal
materia medica
scientific English
Middle English
Early Modern English
manuskrypty
naukowy angielski
średnioangielski
wczesna angielszczyzna
Opis:
This article aims at understanding how scientific writing was evolving from the medieval to the Early Modern times through the study of two copies of the same text belonging to both periods: the Agnus Castus Herbal. This text offers the possibility of studying the fluidity of this specific type of discourse in a time of a profound technological innovation, reflecting the way the texts were not only produced but also perceived. For those making decisions on how to present this old material to new readers and through a new medium, the influence of the new humanist views and the powerful middle-class may have influenced the final resolutions. The Agnus Castus Herbal was a very popular tract in the Middle Ages, a fundamental part of medical treatments at the time, and was probably still of great interest in the early sixteenth century. Its Early Modern English counterpart – published in 1525 – is the first Herbal printed in England.
Celem artykułu jest zrozumienie jak piśmiennictwo naukowe ewoluowało od średniowiecza do czasów nowożytnych. Badanie oparte jest na dwóch kopiach zielnika (Agnus Castus Herbal), który powstał w obu badanych okresach. Analiza tego tekstu pozwala zaobserwować zmiany jakie zachodziły w tego typu tekstach, oraz jak zmiany technologiczne wpłynęły na produkcję oraz postrzeganie zielników. Agnus Castus Herbal był bardzo popularnym traktatem w średniowieczu i prawdopodobnie nadal cieszył się dużym zainteresowaniem na początku XVI wieku. Jego wczesnoangielski odpowiednik – wydany w 1525 r. – jest pierwszym zielnikiem wydrukowanym w Anglii.
Źródło:
Kwartalnik Neofilologiczny; 2021, 3; 319-333
0023-5911
Pojawia się w:
Kwartalnik Neofilologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza układu centrów paramagnetycznych w termicznie sterylizowanym diklofenaku
Free radicals system analysis in thermally sterilized diclofenac
Autorzy:
Pilawa, B.
Ramos, P.
Wilczyński, S.
Czyż, K.
Powiązania:
https://bibliotekanauki.pl/articles/286239.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
diklofenak
wolne rodniki
leki przeciwzapalne
diclofenac
free radicals
anti-inflammatory drugs
Opis:
Wolne rodniki mogą powstawać m.in. w procesie fotolizy, radiolizy, termolizy i sonolizy oraz w wybranych reakcjach chemicznych [1-3]. Termoliza jest procesem polegającym na hemolitycznym rozpadzie wiązania kowalencyjnego w cząsteczce w wyniku zaabsorbowanej energii cieplnej [2,3]. Zjawisko takie może zachodzić podczas termicznej sterylizacji leków, a produkty rozpadu cząsteczki, w tym szczególnie niebezpieczne wolne rodniki, mogą zanieczyszczać sterylizowaną substancję leczniczą. Wolne rodniki zawarte w substancji leczniczej mogą powodować w organizmie efekty toksyczne. Nie znane są właściwości wolnych rodników w większości sterylizowanych substancji leczniczych. W niniejszej pracy wykonano analizę układu wolnych rodników w sterylizowanym termicznie diklofenaku. Diklofenak należy do grupy niesteroidowych leków przeciwzapalnych - NLPZ [4]. Wykazuje silne działanie przeciwzapalne, przeciwbólowe, przeciwgorączkowe. Diklofenak wiąże się z dwoma izoformami cyklooksygenazy (COX1 i COX 2) poprzez co blokuję syntezę prozapalnych prostaglandyn z kwasu arachidono- wego. Techniką pozwalającą na ocenę koncentracji wolnych rodników zanieczyszczających termicznie sterylizowane substancje lecznicze jest spektroskopia elektronowego rezonansu paramagnetycznego EPR. Pomiary EPR wykonano za pomocą spektrometru elektronowego rezonansu paramagnetycznego na pasmo X (9.3GHz) produkcji RADIOPAN-Poznań. Zastosowano modulację pola magnetycznego wynoszącą 100kHz. Częstotliwość promieniowania mikrofalowego rejestrowano miernikiem MCM 101 produkcji RADIOPAN-Poznań. Widma EPR rejestrowano w postaci pierwszej pochodnej absorpcji przy wysokim tłumieniu 15B, aby uniknąć nasycenia mikrofalowego linii. W pracy wykonano badania wolnych rodników w diklofenaku sterylizowanym termicznie. Sterylizację termiczną leku prowadzono w sterylizatorze z wymuszonym obiegiem powietrza w temperaturze180oC. Próbkę ogrzewano w czasie 30 minut. Dla diklofenaku wyjściowego nie poddanego obróbce termicznej nie rejestrowano widm EPR. Oznacza to, że w badanej substancji leczniczej nie występują wolne rodniki. Widma EPR diklofenaku ogrzewanego w temperaturze 180°C charakteryzowała wysoka asymetria. W pracy zbadano zmiany tej asymetrii w zależności od stosowanej mocy mikrofalowej. Zdefiniowano następujące parametry asymetrii poddane analizie: A1/A2, A1-A2, B1/B2, B1-B2. Zasady wyznaczania parametrów asymetrii pokazano na RYSUNKU 1. Na RYSUNKU 1 a i b przedstawiono zależność parametrów A1/A2 i B1/B2, od mocy mikrofalowej wyrażonej w jednostkach względnych (M/M0). Widać wyraźnie, że parametry te zależą w znacznym stopniu od mocy mikrofalowej. Wszystkie zbadane parametry maleją ze wzrostem mocy mikrofalowej. Zmiana parametrów asymetrii kształtu linii EPR wskazuje na występowanie więcej niż jednej grupy wolnych rodników w sterylizowanym termicznie diklofenaku. Średni współczynnik rozszczepienia spektroskopowe¬go g wynoszący 2,0027 świadczy, że niesparowane elektrony zlokalizowane są na atomach tlenu. Zarejestrowano również wpływ mocy mikrofalowej na podstawowe parametry linii EPR termicznie sterylizowanego diklofenaku. Amplituda linii EPR rośnie ze wzrostem mocy mikrofalowej, osiąga wartość maksymalną, a następnie maleje ze wzrostem mocy mikrofalowej. Szerokość linii EPR diklofenaku rośnie ze wzrostem mocy mikrofalowej. Zależności te są charakterystyczne dla wolnych rodników rozmieszczo¬nych jednorodnie w próbce. Oznacza to, że wykonany proces sterylizacji termicznej powoduje generowanie wolnych rodników w całej objętości próbki. Otrzymane wyniki badań spektroskopowych z wykorzystaniem metody elektronowego rezonansu paramagnetycznego wskazują na silne oddziaływania magnetyczne spin-spin w sterylizowanym diklofenaku. Oddziaływania te poszerzają linie EPR (ABpp=0,80mT) i są charakterystyczne dla wolnych rodników położo¬nych blisko siebie w strukturze molekularnej leku. Przeprowadzone analizy pozwalają wyciągnąć następujące wnioski: sterylizacja termiczna diklofenaku w temperaturze 180°C powoduje powstawanie wolnych rodników w leku. Wolne rodniki nie występują w diklofenaku nie poddanym sterylizacji. Zmian asymetrii linii EPR wraz ze wzrostem mocy mikrofalowej jest charakterystyczna dla złożonego układu wolnych rodników w próbce. Wolne rodniki w sterylizowanym termicznie diklofenaku są rozmieszczone jednorodnie, na co wskazuje charakter zmian parametrów linii EPR wraz ze wzrostem mocy mikrofalowej. Wolne rodniki w sterylizowanym termicznie diklofenaku są rozmieszczone blisko siebie, na co wskazuje poszerzenie dipolowe linii EPR. W diklofenaku sterylizowanym termicznie zachodzą wolne procesy relaksacji spin- sieć. Spektroskopia EPR jest metodą przydatną do oceny właściwości wolnordnikowych sterylizowanego termicznie diklofenaku.
Free radicals can be generated in photolysis, radiolysis, thermolysis and sonolysis processes and during some chemical reactions [1-3]. Thermolysis is defined as homolytic dissociation of covalent bond as result of thermal energy absorption [2,3]. This phenomenon can proceed during thermal drag sterilization, and degradation products, especially dangerous free radicals, can decontaminate of medicinal substance. Free radicals in remedial substance can cause toxic effects in human body. Properties of free radicals in the most of sterilized medicinal substances are unknown. In the present study free radicals system of thermally sterilized diclofenac was performed. Diclofenac belongs to non-steroidal anti-inflammatory drug (NSAID) [4]. Diclofenac has analgesic, antipyretic and anti-inflammatory activities. Diclofenac binds to and chelates both isoforms of cyclooxygenase (COX-1 and COX-2), thereby blocking the conversion of arachidonic acid (AA) to pro-inflammatory prostaglandins. Electron paramagnetic resonance spectroscopy (EPR) was applied as the experimental technique to evaluate concentration of free radicals decontaminating thermally sterilized medicinal substance. Measurements of EPR spectra were done by the use of EPR spectrometer at X-band (9.3GHz) produced by RADIOPAN Firm (Poznań). Modulation of magnetic field of 100kHz was applied. Microwave frequency was evaluated using MCM 101 frequency recorder produced by RADIOPAN - Poznań. The first-derivative EPR spectra were recorded with high microwave power attenuation 15dB to avoid the microwave saturation. In the present study free radicals in thermally sterilized diclofenac were studied. Thermal sterilization of the drug was performed in hot air oven with air circulating at 180°C. Sample was heated during 30 minutes. Samples of diclofenac not heated with high temperature gave no EPR signals. It indicates that stabile free radicals do not exist in initial medicinal substance. The EPR spectra of high temperature operated diclofenac are characterize by high asymmetry. In present study dependence of asymmetry on microwave power was investigated. Following parameters of asymmetry were analyzed: A1/A2, A1-A2, B1/B2, B1-B2. Principles of asymmetry parameters determination were performed on FIGURE 1. On FIGURE 1 dependence of EPR lines A1/A2 (a) and B1/B2 parameters on microwave power M/M0 in relative units stated were performed. It was shown that these parameters strongly depend on microwave power. Changes of asymmetry line parameters indicates presence of a few types of free radicals in thermally sterilized diclofenac. Mean g-factor with 2.0027 value indicates that unpaired electrons are located on oxygen atoms. Influence of microwave power on basis EPR parameters for thermally sterilized diclofenac was recorded. Amplitude rises with microwave power increase, reaches maximum value and than decreases with microwave power increase. This kind of relationship indicates that free radicals are homogenously spread in whole sample. It means that thermal sterilization processes generate free radicals in whole volume of the sample. Received spectroscopic results obtained by electron paramagnetic spectroscopy application indicates on strong spin-spin magnetic interactions in sterilized diclofenac. This interactions causing broadening EPR lines (ABpp= 0,80 m T) are characteristic for close located free radicals in molecular structure of the drug. The results of the conducted studies allow the statement that: thermal sterilization at 180°C produce free radicals in diclofenac. Free radicals do not exist in non-sterilized diclofenac. Changes of line asymmetry are characteristic for complex free radicals system in the sample. Changes of EPR line parameters indicate on homogenous spread of free radicals in thermally sterilized diclofenac. Broadening EPR lines inform that free radicals are close located to each other. Slowly spin-lattice relaxation processes proceed in thermally sterilized diclofenac. EPR spectroscopy is useful technique to evaluation free radicals properties in thermally sterilized diclofenac.
Źródło:
Engineering of Biomaterials; 2008, 11, no. 81-84; 57-58
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cap Formation Induced by Concanavalin A in Pathogenic Free-living Amoebae
Autorzy:
González-Robles, A.
Cristóbal-Ramos, A. R.
González-Lázaro, M.
Omaña-Molina, M.
Martínez-Palomo, A.
Powiązania:
https://bibliotekanauki.pl/articles/763565.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Free-living amoebae, Con A, capping, polar redistribution
Opis:
Morphological differences in cap formation were found when trophozoites of different free-living amoebae were treated with the lectin Concanavalin A, which resulted in a rapid redistribution of certain surface components to form small clusters and membrane-folded structures of diverse sizes. Acanthamoeba castellanii, Acanthamoba polyphaga and Naegleria lovaniensis exhibited characteristic caps, however, in A. castellanii this structure was larger and included several folds of the plasma membrane; furthermore, some of these caps had vacuoles containing a fi bro granular content. In contrast, the caps formed by A. polyphaga and N. lovaniensis lacked vacuoles. Regarding Naegleria fowleri, the trophozoites did not produce a defi ned cap, and only small patches of lectin-bound surface receptor complexes were observed at one pole of the cell body. In the free-living amoebae studied, it was not possible to correlate the shape and size of cap with pathogenicity.
Źródło:
Acta Protozoologica; 2011, 50, 2
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of Goertzel-based frequency estimation for power quality monitoring in embedded measurement systems
Autorzy:
Rodrigues, Nuno M.
Janeiro, Fernando M.
Ramos, Pedro M.
Powiązania:
https://bibliotekanauki.pl/articles/2173880.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power quality
frequency estimation
non-integer Goertzel
frequency interpolation
embedded measurement systems
Opis:
International standards from IEC and IEEE regulate power grid parameters such as the RMS value, frequency, harmonic and interharmonic distortion, unbalance or the presence of transients, that are important to assure the quality of distributed power. Standard IEC 61000-4-30 suggests the zero crossing algorithm for the measurement of the power grid frequency, but also states that different algorithms can be used. This paper proposes a new algorithm, the Fractional Interpolated Discrete Fourier Transform, FracIpDFT, to estimate the power grid frequency, suitable for implementation in resource limited embedded measurement systems. It is based on the non-integer Goertzel algorithm followed by interpolation at non-integer multiples of the DFT frequency resolution. The proposed algorithm is validated and its performance compared with other algorithms through numerical simulations. Implementation details of the FracIpDFT in an ARM Cortex M4 processor are presented along with frequency measurement results performed with the proposed algorithm in the developed system.
Źródło:
Metrology and Measurement Systems; 2022, 29, 3; 455--468
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bacterial recognition of thermal glycation products derived from porcine serum albumin with lactose
Autorzy:
Sarabia-Sainz, Andre-i
Ramos-Clamont, Gabriela
Winzerling, Joy
Vázquez-Moreno, Luz
Powiązania:
https://bibliotekanauki.pl/articles/1039957.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
neoglycans
bacterial recognition
E. coli K88 adhesion
glycation of serum albumin
Opis:
Recently, glyco-therapy is proposed to prevent the interaction of bacterial lectins with host ligands (glycoconjugates). This interaction represents the first step in infection. Neoglycans referred to as PSA-Lac (PSA-Glu (β1-4) Gal) were obtained by conjugation of porcine serum albumin (PSA) with lactose at 80 °C, 100 °C and 120 ºC. Characterization studies of the products showed that PSA could contain 1, 38 or 41 added lactoses, depending on the reaction temperature. These neoglycans were approximately 10 times more glycated than PSA-Lac obtained in previous work. Lactose conjugation occurred only at lysines and PSA-Lac contained terminal galactoses as confirmed by Ricinus communis lectin recognition. Furthermore, Escherichia coli K88+, K88ab, K88ac and K88ad adhesins showed affinity toward all PSA-Lac neoglycans, and the most effective was the PSA-Lac obtained after 100 ºC treatment. In vitro, this neoglycan partially inhibited the adhesion of E. coli K88+ to piglet mucin (its natural ligand). These results provide support for the hypothesis that glycated proteins can be used as an alternative for bioactive compounds for disease prevention.
Źródło:
Acta Biochimica Polonica; 2011, 58, 1; 95-100
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ESR Studies of Paramagnetic Centers in Pharmaceutical Materials - Cefaclor and Clarithromycin as an Example
Autorzy:
Skowronska, A.
Wojciechowski, M.
Ramos, P.
Pilawa, B.
Kruk, D.
Powiązania:
https://bibliotekanauki.pl/articles/1490205.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.15.La
87.64.kj
87.64.kh
75.10.Dg
Opis:
Electron spin resonance (ESR) studies of two antibiotics, Cefaclor and Clarithromycin, have been performed in order to investigate concentration and dynamics of free radicals generated in these compounds due to thermal sterilization. For Cefaclor three combinations of temperature and heating time have been applied: 160°C, 170°C, 180°C for 120 min, 60 min, and 30 min, respectively, according to the pharmaceutical sterilization norm. Clarithromycin has been heated at 160°C for 120 min. The ESR lineshape has been investigated versus microwave power ranging from 2.2 mW to 70 mW. Electron spin-spin relaxation time has been estimated from the ESR lineshape analysis. Concentrations of radicals generated due to different sterilization procedures have been compared with the purpose to select the best sterilization scheme.
Źródło:
Acta Physica Polonica A; 2012, 121, 2; 514-517
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Entre el cuerpo y el espíritu en la poesía de Piedra y Cielo
Between the body and the spirit in the poesy of “Piedra y Cielo”
Autorzy:
Ortiz Ramos, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/1368360.pdf
Data publikacji:
2021-02-02
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
body
spirit
Piedra y Cielo
Colombian poetry
Opis:
The two seemingly opposing realities: the body and the spirit, have always been the source of the inspiration for the artists of the different times and cultures. In Colombia of the 1940s the new poetry group was developed and called “Piedra y Cielo.” The group redefined the Colombian poetry of those times by introducing numerous changes and innovations. The name of the group (which literally means ‘the Stone and the Sky’) alludes to the two dimensions of ourlife: the corporeal and the spiritual. Hence, the naming suggests that the poetry created by the group would seek for and demonstrate the relationship between the two dimensions. Thus, this article is to analyse the way that the “Piedra y Cielo” poets understood the role of the relationship in question while working on their poems ‒ in accordance with their theoretical commentaries and how they reflected this understanding in their poetry.
Źródło:
Romanica Silesiana; 2019, 15, 1; 130-143
1898-2433
2353-9887
Pojawia się w:
Romanica Silesiana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strategies for smart mobility: perspectives vision 4.0
Strategie dla inteligentnej mobilności: wizja perspektywiczna 4.0
Autorzy:
Ramos, Y.
Powiązania:
https://bibliotekanauki.pl/articles/248220.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Komunikacji Rzeczpospolitej Polskiej
Tematy:
urban mobility
smart strategies
social-economy transport arena
engineering role
mobilność miejska
inteligentne strategie
socjo-ekonomiczna arena transportu
rola inżynierii
Opis:
The future of mobility is more and more impacting how businesses operate in many industries, and it is already changing social behaviours. Many companies already announced their fully self-driving car projects [3], others are connecting millions of vehicles this year, more than in any other wireless category, including smartphones, and these developments are just the first tentative steps toward a new mobility ecosystem in the new industrial environments that are defined by Industry 4.0 and the Internet Of Things. From another perspective, movement and mobility are the core dynamics of our societies as its centrality is social, economic and urbanistic. Today mobility has become indispensable for access to most goods, services and social relations and being able to move around to and in cities, actually governs access to housing, work, education, culture, sports, business, new opportunities of personal and professional life. Societies become increasingly complex and diverse, designing and engineering these new societies and ecosystems is the key competence of us, engineers and architects. The goal of this article is to define and propose smart strategies for modern mobility where moving from A to B is not anymore a physical possibility, but where strategic thinking comes into account and empowers our engineering SWISSENGINEERING communities so to highly and efficiently contribute to the governance and operations of the socio-economical arena of our everyday lives.
Nowoczesne rozwiązania w zakresie mobilności już dziś wywierają istotny wpływ na funkcjonowanie firm w wielu gałęziach przemysłu, powodując zmiany zachowań społecznych. Wiele wiodących firm zapoczątkowało projekty w pełni samosterujących bezobsługowych samochodów, inni łączą miliony pojazdów w inteligentną sieć, w tym roku większą niż w każdej innej kategorii urządzeń bezprzewodowych, w tym smartfonów. Te zmiany to tylko pierwsze nieśmiałe kroki w kierunku nowego ekosystemu mobilności, w nowych środowiskach przemysłowych, które są zdefiniowane jako „Przemysł 4.0” i „Internet Rzeczy”. Z innej perspektywy, ruch i mobilność to podstawowe uwarunkowania dynamiki społeczeństw, decydujące o ich centralnej roli społecznej, gospodarczej i geopolitycznej. Dzisiaj mobilność staje się niezbędna z uwagi na dostęp do większości towarów, usług i relacji społecznych. Transport umożliwia poruszanie się w miastach, faktycznie regulując dostęp do mieszkania, pracy, edukacji, kultury, sportu, biznesu, nowych możliwości życia osobistego i zawodowego. Społeczeństwa stają się coraz bardziej złożone i zróżnicowane, zatem projektowanie mobilności oraz inżynieria transportu dla tych nowych społeczności i ekosystemów stanowi naszą, architektów i inżynierów, kluczową kompetencję. Niniejszy artykuł ma na celu zdefiniowanie i zaprezentowanie inteligentnych strategii dla nowoczesnej mobilności, gdzie przemieszczanie się z punktu A do B nie jest już fizycznym zjawiskiem, ale gdzie jest brane pod uwagę strategiczne myślenie, co upoważnia społeczności naszych inżynierów do współtworzenia skutecznego zarządzania i obsługi działań w ramach społeczno-ekonomicznej przestrzeni naszego codziennego życia.
Źródło:
Zeszyty Naukowo-Techniczne Stowarzyszenia Inżynierów i Techników Komunikacji w Krakowie. Seria: Materiały Konferencyjne; 2016, 4(111); 89-98
1231-9171
Pojawia się w:
Zeszyty Naukowo-Techniczne Stowarzyszenia Inżynierów i Techników Komunikacji w Krakowie. Seria: Materiały Konferencyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free radical formation in salicylic acid and heating parameters – application of EPR, UV-Vis, TGA and colorimetry examination to optimize thermal sterilization
Autorzy:
Ramos, Paweł
Pilawa, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/895669.pdf
Data publikacji:
2020-06-29
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
free radicals
EPR spectroscopy
salicylic acid
UV-Vis spectrophotometry
thermogravimetry
thermal sterilization
Opis:
Salicylic acid heated at different temperatures and times was examined by an X-band (9.3 GHz) EPR spectroscopy, UV-Vis spectrophotometry, TGA and colorimetry test to optimize its thermal sterilization process. Free radical formation (~1018 spin/g) during thermal sterilization of salicylic acid according to the pharmaceutical norms at temperature 120oC and time of 120 minutes was compared with those for heating at the new tested temperatures and times: 130oC and 60 minutes, and 140oC and 30 minutes. It was obtained that the relatively lower free radical concentrations characterized salicylic acid heated at temperatures (times): 120oC (120 minutes), and 130oC (60 minutes), than at temperature (time) 140oC (30 minutes). So treatment at temperature 120oC during 120 minutes, and temperature 130oC during 60 minutes, were recommended as the optimal for thermal sterilization of salicylic acid. Salicylic acid should not be sterilized at temperature 140oC during 30 minutes, because of the highest free radical formation. Free radical systems of thermally treated salicylic acid revealed complex character. Fast spin-lattice relaxation processes existed in heated salicylic acid. Strong dipolar interactions characterized all the heated salicylic acid samples. EPR spectroscopy, UV-Vis spectrophotometry, thermogravimetry, and color measurement may be helpful besides microbiological analysis to optimize thermal sterilization conditions of salicylic acid.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2020, 77, 3; 431-441
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the presence of a pustulated temnospondyl in the Lower Triassic of southern Brazil
Autorzy:
Dias-da-Silva, S.
Ramos Ilha, A.L.
Powiązania:
https://bibliotekanauki.pl/articles/22350.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
temnospondyl
Lower Triassic
Brazil
Temnospondyli
Plagiosauridae
paleobiogeography
Sanga do Cabral Formation
Sangaia lavinai
South America
Opis:
The fossil record of temnospondyls in South America has been greatly expanded in the last 10 years, increasing their overall significance. They occur in Argentina, Brazil, and Uruguay, and range from the Guadalupian to the Late Triassic. The Early Triassic temnospondyl record in southern Brazil is mainly composed of fragmentary specimens, usually represented by dermal skull bones from the Sanga do Cabral Formation. Some of these fragments were tentatively referred to Lydekkerinidae and Rhytidosteidae based on their characteristic ridge−grooved “spider−web” pattern of ornamentation. In this contribution we report, for the first time, a temnospondyl skull fragment with pustulated sculpturing pattern, which is tentatively ascribed to Plagiosauridae. This new record could indicate the presence of a new temnospondyl taxon for the Lower Triassic of South America.
Źródło:
Acta Palaeontologica Polonica; 2009, 54, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High incidence of acute leukemia in the proximity of some industrial facilities in El Bierzo, northwestern Spain
Autorzy:
Rodríguez-García, José A.
Ramos, Fernando
Powiązania:
https://bibliotekanauki.pl/articles/2180111.pdf
Data publikacji:
2012-03-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
acute leukemia
Benzo(a)pyrene
industrial facilities
electromagnetic radiation
power lines
thermoelectric power plant
Opis:
Objectives: To estimate the incidence of acute leukemia (AL) in El Bierzo (BZ) and to carry out a cross-association analysis in order to suggest some etiological clues. Materials and Methods: We registered all new AL cases diagnosed 2000–2005. Annual standardized incidence rate (SIR) was calculated by the direct method. A cross-association analysis was performed by non-parametric methods and we checked the potential interaction between putative etiological factors by calculating Chi-square-for-trend. Results: SIR was 5.1 cases per 100 000, surpassing the Spanish, European and world average figures and heterogeneous throughout the region. We detected a negative correlation between acute myeloblastic leukemia (AML) SIR in every municipality and both the air distance to the nearest thermoelectric power plant (TPP) (Rho = –0.409; p = 0.01) and to the point of maximum density of the high-power lines (HPL) network (Rho = –0.329; p = 0.04). Accordingly, SIR was higher in the municipalities situated < 7.5 km away from TPP (9.58 vs. 1.72; p = 0.004) or < 10 km away from HPL (3.90 vs. 3.19; p = 0.045). A positive relation between both factors was observed (Chi-square-for-trend = 9.209; p = 0.006). Conclusions: SIR of AL in BZ is higher than the Spanish average and that of most countries in the world. Residing near TPP or HPL confers a higher risk of AML, with synergistic effect between both factors.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2012, 25, 1; 22-30
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Powstawanie wolnych rodników podczas rozkładu termicznego monoazotanu izosorbitolu
Formation of free radicals during thermal decomposition of isosorbide mononitrate
Autorzy:
Ramos, P.
Pilawa, B.
Kawka, M.
Powiązania:
https://bibliotekanauki.pl/articles/284359.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
monoazotan izosorbitolu
rozkład termiczny
wolne rodniki
spektroskopia EPR
isosorbide mononitrate
thermal decomposition
free radicals
EPR spectroscopy
Opis:
Wykonano badania wolnych rodników generowanych w monazotanie izosorbitolu pod wpływem wysokiej temperatury. Wyznaczono metodą elektronowego rezonansu paramagnetycznego (EPR) koncentrację wolnych rodników w próbce. Zbadano wpływ mocy mikrofalowej na kształt widm EPR monoazotanu izosorbitolu. Analizowano procesy relaksacji spin-spin i spin-sieć. Określono wpływ czasu przechowywania próbki po rozkładzie termicznym na wolne rodniki w leku.
Studies of free radicals formed in isosorbide mononitrate upon high temperature were performed.. Free radical concentration in the sample was determined by electron paramagnetic resonance (EPR) method. Influence of microwave power on lineshape of EPR spectra of isisorbide mononitrate was examined. Spin-spin and spin-lattice relaxation proccesses were analysed. The effect of storage time of the sample on free radicals in the drug was determined.
Źródło:
Engineering of Biomaterials; 2009, 12, no. 89-91; 157-160
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Explanatory contribution of Social Responsibility and Organizational Justice on Organizational Commitment: An exploratory study in a Higher Public Education institution
Autorzy:
Rafael, Graça
Gonçalves, Gabriela
Santos, Joana
Orgambídez-Ramos, Alejandro
Sousa, Cátia
Powiązania:
https://bibliotekanauki.pl/articles/2128129.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Social Responsibility
Organizational Commitment
Organizational Justice
Structural Equation Model
Opis:
This study aimed to analyze the explanatory contribution of social responsibility and organizational justice on commitment through the setting up of a theoretical model in order to better understand the relationships that are established between these constructs. The empirical study was developed in a public higher education institution with a sample of 233 employees, professors and staff. The proposed model was estimated using a structural equation model. It was possible to observe a relationship between interactional justice perceptions and social responsibility and there contribute to the explanation of organizational affective commitment. At the same time, it was possible to observe a relationship between distributive justice and social responsibility of employees.
Źródło:
Polish Psychological Bulletin; 2017, 4; 470-480
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trace fossils from the Upper Cretaceous Capacete Formation, Sanfranciscana Basin, Central Brazil
Autorzy:
Sedorko, Daniel
Alessandretti, Luciano
Warren, Lucas Veríssimo
Verde, Mariano
Rangel, Caio César
Ramos, Kimberly Silva
Netto, Renata Guimarães
Powiązania:
https://bibliotekanauki.pl/articles/1836263.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
meandering fluvial system
insects
continental trace fossils
Scoyenia ichnofacies
Opis:
The Upper Cretaceous Capacete Formation, from the intracratonic Sanfranciscana Basin, central Brazil, consists of epiclastic sediments with a significant aeolian contribution. This unit has been traditionally interpreted as deposited by alluvial fans distally grading to braided rivers in an arid- to semiarid climate within the central part of southwestern Gondwana. Locally, some expositions with wide lateral extension show architectural elements indicative of deposition in meandering rivers, such as floodplain fines (FF) interbedded with crevasse splay (CR), lateral-accretion macroforms (LA), and channels (CH). Bioturbation within the meandering fluvial deposits is commonly associated with the floodplain element, mainly occurring in fine-grained sandstone and mudstone. The lateral-accretion elements and channel deposits are barren of trace fossils. Sandstone with climbing ripples (Sr) from the element CR show low bioturbation of meniscate trace fossils assigned to Taenidium, Beaconites, and Scoyenia ichnogenera. Simple vertical and horizontal burrows identified as Skolithos and Palaeophycus occur associated with Taenidium and Camborygma in sandstone facies (Sr, St and Sh), as well as rhizoliths, representing the Scoyenia ichnofacies. The predominance of trace fossils related to the FF and CR architectural elements attests to the colonization mostly by insects in episodic and vegetated flood plains of the meandering river system from the Capacete Formation. Thus, despite the primarily arid to semiarid conditions interpreted for the inner parts of the newly formed South American continent during the Upper Cretaceous, our new data support deposition under humid conditions in some intervals of the Capacete Formation from the Sanfranciscana Basin.
Źródło:
Annales Societatis Geologorum Poloniae; 2020, 90, 3; 247-260
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unusual environmental conditions preserve a Permian mesosaur-bearing Konservat-Lagerstatte from Uruguay
Autorzy:
Pineiro, G.
Ramos, A.
Goso, C.
Scarabino, F.
Laurin, M.
Powiązania:
https://bibliotekanauki.pl/articles/22526.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
unusual environment
environment condition
paleontology
Permian
mesosaur
Konservat-Lagerstatte
Uruguay
Lower Permian
Mesosauridae
Pygocephalomorpha
hypersaline environment
Mangrullo Formation
Opis:
The environmental characterization of the Lower Permian mesosaur−bearing strata of the Mangrullo Formation (Paraná Basin, northeastern Uruguay) has been controversial. Historically, marine conditions were suggested for this unit, despite the absence of any normal marine fossils. More recently, some authors have argued for freshwater to brackish settings, inferring fluctuating environmental conditions, which would have generated abrupt changes in the composition of the communities. Mesosaurs are the only tetrapods found in this unit, and they colonized the basin at the time of highest isolation, and apparently increased salinity, coincident with a gradual global rise in aridity. An assemblage of extremely low diversity (the “mesosaur community”) developed, with mesosaur reptiles, pygocephalomorph crustaceans, and the vermiform producers of the trace fossil Chondrites as the dominant components. This community may have existed under temporary hypersaline, lagoon−like conditions, as suggested by ecological, anatomical and physiological attributes of its member taxa. This interpretation is supported by sedimentological and mineralogical features of the enclosing rocks, also seen in the correlative Brazilian Iratí and South African Whitehill formations. In the Uruguayan deposits, as well as in their Brazilian correlatives, relatively close volcanic events affected the basin. This particular environment, where bottom waters were depleted of oxygen and hypersaline, retarded decay of the carcasses, and precluded the development of bioturbating organism, and together with bacterial sealing, favoured exquisite preservation of the fossils, including soft tissues. This leads us to consider the fossil−bearing strata of the Mangrullo Formation as a Konservat−Lagerstätte, the oldest known for South America.
Źródło:
Acta Palaeontologica Polonica; 2012, 57, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intense Laser Field Effects on the Shallow-Donor Impurity States in Rectangular-Shaped Quantum Well Wires
Autorzy:
Duque, C.
Mora-Ramos, M.
Yesilgul, U.
Ungan, F.
Sakiroglu, S.
Kasapoglu, E.
Sari, H.
Sökmen, I.
Powiązania:
https://bibliotekanauki.pl/articles/1195307.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.Ey
78.67.De
78.67.-n
Opis:
Using the effective mass and parabolic band approximations, the binding energy of a shallow donor impurity is calculated in a GaAs-(Ga,Al)As quantum well wire of rectangular transversal section, under the combined effects of two independent axially-applied intense laser radiation fields and a static electric field oriented in the cross-section plane. The lateral size of the rectangular cross-section is assumed to be larger than 10 nm, in such a way that the uncorrelated electron motion along the x and y directions can be considered uncoupled. The impurity-related states are calculated by means of a variational procedure using a three-dimensional hydrogen-like trial wave function. The intense laser field effects are introduced via the combination of the Floquet method for the laser-modified confinement potential shape and the inclusion of a two-interaction centers model for the Coulombic coupling. It is shown that, according to the polarization of the incident radiation, the quantum well wire can evolve from a single 1D-heterostructure towards a configuration of two-well defined or four-well defined laser-induced parallel coupled quantum well wires. The obtained results also show that the binding energy is strongly dependent on the impurity position and on the strength of the intense laser field parameter.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 198-201
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical and chemical characterization of masa and tortillas from parental lines, crosses, and one hybrid
Autorzy:
Valderrama-Bravo, C.
Dominguez-Pacheco, A.
Hernandez-Aguilar, C.
Zepeda-Bautista, R.
del Real-Lopez, A.
Pahua-Ramos, M.E.
Arellano-Vazquez, J.L.
Moreno-Martinez, E.
Powiązania:
https://bibliotekanauki.pl/articles/24739.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Opis:
In maize plant breeding aimed at producing a hybrid, it is necessary to characterize the parents and hybrids by their agronomic aspects and grain quality so that the processing industry may offer consumers a quality product and also improve its efficiency. This study evaluated the viscoelastic parameters of masa and the chemical and texture properties of tortillas obtained from parent lines (M-54, M55, and CML-242), two single crosses (M54xM55 and M55xM54), and one hybrid (H-70). The morpho- logy of the maize grains and tortillas was analyzed using scanning electron microscopy. The firmness of masa obtained from CML-242 and H-70 maize was higher than that from the other maize genotypes. M-54 tortillas showed the lowest crude fiber content. Otherwise, tortillas obtained from the M55xM54 hard grain had the lowest fat content and extensibility, while H-70 tortillas showed an intermediate breaking point and extensibility. M-54 and M54xM55 tortillas were softer due to their more swollen starch granules. In contrast, rigid tortillas were obtained from CML-242 and H-70. Grain hardness causes different morphology in starch and tortilla of maize genotypes. However, grain hardness did not influence the characteristics of texture in tortillas.
Źródło:
International Agrophysics; 2017, 31, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biased versus unbiased randomness in homo-polymers and copolymers of amino acids in the prebiotic world
Autorzy:
Mosqueira, Fernando
Negron, Alicia
Ramos, Sergio
Polanco, Carlos
Powiązania:
https://bibliotekanauki.pl/articles/1039646.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
polarity of amino acids
homo-peptides
prebiotic co-polypeptides
lysine
Markov chain
prebiotic homo polymerization of amino acids
Opis:
The polymerization of amino acids under anhydrous prebiotic conditions was first studied several decades ago. Here we use a stochastic model stressing the relevant role of the polarity of amino acids in the formation of oligopeptides in a prebiotic milieu. Our goal is to outline the predominance of co-polypeptides over homo-polypeptides, resulting not only from the randomness, but also from polarity properties of amino acids. Our results conclude that there was a higher probability of the formation of co-polypeptides than of homo-polymers. Besides, we may hypothesize that the former would have a more ample spectrum of possible chemical functions than homo-polypeptides.
Źródło:
Acta Biochimica Polonica; 2012, 59, 4; 543-547
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie spektroskopii EPR do badania wolnych rodników generowanych termicznie w drotawerynie
Application of EPR spectroscopy for examination of thermally formed free radicals in drotaverine
Autorzy:
Ramos, Paweł
Pilawa, Barbara
Adamski, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/1035082.pdf
Data publikacji:
2014
Wydawca:
Śląski Uniwersytet Medyczny w Katowicach
Tematy:
drotaweryna
wolne rodniki
termoliza
spektroskopia epr
drotaverine
free radicals
thermolysis
epr spectroscopy
Opis:
INTRODUCTION Microorganisms should be removed from drugs during their production, however, sterilization processes should not produce free radicals. Free radicals in drotaverine were studied. The applicability of thermal sterilization for drotaverine was investigated. MATERIAL AND METHODS Drotaverine heated to 160oC was examined by the EPR method. Free radical concentration, their distribution in the sample, the complex character of the free radical system and magnetic spin-spin interactions in the drug were determined. Changes in the free radical concentration in drotaverine during storage after sterilization also were examined. The sterilization conditions were chosen according to pharmakopeal norms. The analysed drug was sterilized in dry hot air. RESULTS EPR lines were not obtained for drotaverine before sterilization. It was demonstrated that drotaverine after thermal sterilization at temperature 160oC contains free radicals and exhibits EPR spectra. The free radical concen-tration in drotaverine changes with storage time after thermal treatment. Interactions with oxygen are probably responsible for this effect. The free radicals are homogeneously distributed in drotaverine since characteristic correlations between the amplitudes and linewidths of the EPR lines and microwave power were observed. The free radicals are closely located to one another in drotaverine and they strongly interact in a dipolar manner, which cause broadening of the EPR spectra. Continuous microwave saturation of the EPR spectra revealed that slow spin-lattice relaxation processes occur in thermally sterilized drotaverine. The shape of the EPR spectra and asymmetry parameters of the test drug change with increasing microwave power, indicating the complex nature of the free radicals in the sample. CONCLUSIONS Drotaverine should not be thermally sterilized because of free radical formation. The obtained results confirmed the usefulness of EPR spectroscopy to examine thermally sterilized drugs. The EPR method may be used as a supplement to microbiological tests.
WSTĘP Leki wymagają usunięcia drobnoustrojów podczas ich produkcji, jednak procesy sterylizacji nie powinny generować wolnych rodników. Zbadano wolne rodniki w drotawerynie. Sprawdzono, czy sterylizacja termiczna może być w tym przypadku stosowana. MATERIAŁY I METODY Zbadano drotawerynę ogrzewaną w 160oC metodą EPR. Wyznaczono koncentrację wolnych rodników, określono sposób ich rozmieszczenia w ogrzanej próbce, złożoność układu wolnorodnikowego oraz oddziaływania magnetyczne spin-spin. Zbadano również zmiany koncentracji wolnych rodników w drotawerynie podczas przechowywania leku po sterylizacji. Warunki sterylizacji termicznej wybrano zgodnie z obowiązującymi normami farmakopealnymi. Lek sterylizowano suchym gorącym powietrzem. WYNIKI Nie uzyskano linii EPR dla drotaweryny przed sterylizacją. Wykazano, że drotaweryna po sterylizacji termicznej w temp. 160oC zawiera wolne rodniki i wykazuje widma EPR. Koncentracja wolnych rodników w drotawerynie zmienia się wraz z czasem przechowywania leku po obróbce termicznej. Za efekt ten odpowiadają prawdopodobnie oddziaływania z tlenem. Wolne rodniki w drotawerynie rozmieszczone są jednorodnie, ponieważ zaobserwowano charakterystyczne dla tego przypadku zależności amplitudy i szerokości linii EPR od mocy mikrofalowej. Wolne rodniki w drotawerynie są położone blisko siebie i silnie oddziałują dipolowo, co powoduje poszerzenie widm EPR. Ciągłe nasycenie mikrofalowe widm EPR wykazało, że w drotawerynie sterylizowanej termicznie zachodzą wolne procesy relaksacji spin-sieć. Kształt widm EPR i parametry asymetrii testowanego leku zmieniają się wraz ze wzrostem mocy mikrofalowej, co wskazuje na złożony charakter układu wolnych rodników w próbce. WNIOSKI Drotaweryna nie powinna być sterylizowana termicznie ze względu na generowanie wolnych rodników. Uzyskane rezultaty potwierdziły przydatność spektroskopii EPR do badania leków sterylizowanych termicznie. Metoda EPR może być wykorzystana jako uzupełnienie testów mikrobiologicznych.
Źródło:
Annales Academiae Medicae Silesiensis; 2014, 68, 1; 28-37
1734-025X
Pojawia się w:
Annales Academiae Medicae Silesiensis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plant hemoglobins can be maintained in active form by reduced flavins and confer tolerance to nitro-oxidative stress
Autorzy:
Sainz, M.
Perez-Rontome, C.
Ramos, J.
Mulet, J.
James, E.
Becana, M.
Powiązania:
https://bibliotekanauki.pl/articles/81132.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plant
hemoglobin
nitric oxide
nonsymbiotic hemoglobin
flavin
chloroplast
thylakoid
oxidative stress
methyl viologen
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frecuencia léxica y secuenciación del vocabulario en lecturas graduadas del español
Lexical frequency and vocabulary sequencing in Spanish graded readers
Autorzy:
García Salido, Marcos
Vincze, Orsolya
Orol González, Ana
Alonso Ramos, Margarita
Powiązania:
https://bibliotekanauki.pl/articles/676256.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
nivelación del vocabulario
nivelación de colocaciones
frecuencia léxica
vocabulary grading
collocations grading
lexical frequency
Opis:
This article examines the distribution of words and collocations in a corpus of Spanish graded readers across different levels of proficiency. The main aim is to verify whether there is any relation between lexical frequency as registered in a general corpus of Spanish and the distribution of vocabulary items (single words and collocations) in texts of different levels, such that there is an increase of infrequent items as the proficiency level rises. Such a relation cannot be taken for granted in the case of Spanish graded readers, since a review of the literature suggests that factors other than vocabulary selection (namely, grammatical features) have been given priority in creating texts for a given proficiency level.
El presente artículo estudia la distribución de palabras y colocaciones presentes en un corpus de lecturas graduadas del español a través de los distintos niveles de aprendizaje. El objetivo principal es verificar si se da una correlación entre la frecuencia léxica tal como se registra en un corpus del español general y la distribución de los elementos del vocabulario (formas univerbales y pluriverbales) en textos de diferente nivel, de manera que los elementos infrecuentes sean más numerosos conforme el nivel sube. Esta correlación no se puede dar por supuesta en las lecturas graduadas en español, pues un repaso a la bibliografía relevante indica que se ha dado prioridad a factores distintos a la selección del vocabulario en la creación de este tipo de materiales (en concreto, al componente gramatical).
Źródło:
e-Scripta Romanica; 2018, 5; 39-60
2392-0718
Pojawia się w:
e-Scripta Romanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combined Analyses of Ion Beam Synthesized Layers in Porous Silicon
Autorzy:
Ramos, A. R.
Pászti, F.
Horváth, Z. E.
Vázsonyi, É.
Conde, O.
da Silva, M. F.
da Silva, M. R.
Soares, J. C.
Powiązania:
https://bibliotekanauki.pl/articles/2028988.pdf
Data publikacji:
2001-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
61.18.Bn
61.43.Gt
68.55.Ln
Opis:
High dose ion implantation was used to form polycrystalline silicide films on porous silicon with different native concentrations of light impurities (C and O). Porous silicon layers severalμm thick were implanted with 170 keV Cr$\text{}^{+}$ ions to fluences of 3×10$\text{}^{17}$ ions/cm$\text{}^{2}$ both at room temperature and 450ºC. Similar samples were implanted with 100 keV Co$\text{}^{+}$ ions to fluences of 2×10$\text{}^{17}$ ions/cm$\text{}^{2}$ at room temperature, 350ºC, and 450ºC. The formed silicide compounds were studied by Rutherford backscattering spectrometry, elastic recoil detection, glancing incidence X-ray diffraction, and four point-probe sheet resistance measurements. Selected Co implanted samples were analysed by cross-section transmission electron microscopy. Results show that the light impurities were partially expelled from the forming silicide layer. Combining cross-section transmission electron microscopy with ion beam methods it was possible to show that, in the implanted region, the porous structure collapses and densifies during implantation, but the underlying porous silicon remains intact. The layer structure, as well as the quality and type of the formed silicide, were found to depend on the original impurity level, implantation temperature, and annealing.
Źródło:
Acta Physica Polonica A; 2001, 100, 5; 773-780
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative 2-D electrophoresis of salivary proteins in Triatoma dimidiata and Rhodnius prolixus (Hemiptera: Reduviidae) and major cross-reactive antigens
Autorzy:
Monteon, Victor
May-Gil, Ivan
Acosta-Viana, Karla
Ramos-Logonio, Angel
Hernandez, Oscar
Lopez, Ruth
Powiązania:
https://bibliotekanauki.pl/articles/972107.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
salivary proteins
2-d analysis
immunogens
Rhodinius prolixius
Triatoma dimidiata
Opis:
An immune response to triatomine’s saliva is an immunological marker of exposure to triatomine bites. However, considerable variability in salivary protein profiles did exist among species. In the present work, we compare salivary proteins from Mexican Triatoma dimidiata and Rhodnius prolixus using 2-D electrophoresis. A clear differential saliva profile was found to exist between these two triatomine species. Fewer protein spots were detected in R. prolixus than in T. dimidiata. More than half of the proteins had an isoelectric point between 5 and 7 and a molecular weight between 10 and 30 kDa in T. dimidiata. Mice exposed to T. dimidiata saliva mount an immune response to three major cross-reacting antigens in R. prolixius saliva with weights of 10 kDa and 55 kDa. Our findings may alert for the presence of cross-reacting antigens between triatomine species in regions where two or more species are overlapping in the same geographical area.
Źródło:
Annals of Parasitology; 2017, 63, 2; 121-125
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pre-exposure to faeces or saliva of Triatoma dimidiata decreases parasitemia in mice challenged with Trypanosoma cruzi: a description of the inflammatory reaction at the inoculation site
Autorzy:
Monteon, V.
Quen-Ramirez, E.
Macedo-Reyes, V.
Lopez, R.
Acosta-Viana, K.
Pennigton, P.
Ramos-Ligonio, A.
Powiązania:
https://bibliotekanauki.pl/articles/6253.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Parazytologiczne
Opis:
Under natural conditions, Trypanosoma cruzi infection is transmitted to mammals when faeces contaminated with metacyclic trypomastigotes gain access through skin lesions, mucosa or bite wounds. Natural infection of bugs with T. cruzi can vary greatly from less than 1% up to 70%, depending on triatomine species: in the case of Triatoma dimidiata, the percentage of infection is around 30%. In this work uses biological fluids (saliva and faeces) from Triatoma dimidiata to inoculate experimental animals once or multiple times, before inoculation with faeces contaminated with metacyclic trypomastigotes discrete type unit Ia (TcI). The site of infection was analyzed for histological changes based on hematoxile-eosine technique and toluide blue stain for mast cells. Inoculation with saliva led to the recruitment of eosinophils and mononuclear cells at the inoculation site, whereas inoculation with faeces led to the recruitment of neutrophils. Mice inoculated multiple times exhibited a strong inflammatory reaction from the first hour. Mono- or multi-exposure to T. dimidiata fluids before inoculation with metacyclic trypomastigotes helped to control the level of parasitemia. Previous contact with saliva or faeces of T. dimidiata reduces parasitemia in T. cruzi I -infected mice.
Źródło:
Annals of Parasitology; 2016, 62, 3
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of storage time on microwave saturation of EPR spectra of thermally sterilized streptomycin and its practical applications
Autorzy:
Ramos, P.
Pilawa, B.
Bernaś, M.
Powiązania:
https://bibliotekanauki.pl/articles/333612.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
spektroskopia elektronowego rezonansu paramagnetycznego
nasycenie mikrofalowe
wolne rodniki
streptomycyna
sterylizacja prądu termicznego
EPR spectra
microwave saturation
free radicals
streptomycin
thermal sterilization
Opis:
Electron paramagnetic resonance spectroscopy at X-band (9.3 GHz) is used as the tool of optimalization of storage of thermally sterilized aminoglycoside antibiotic - streptomycin. Thermal sterilization at different conditions was performed according to the norms. Changes in free radicals system of this drug during storage after sterilization were detected. Lineshape analysis and microwave saturation of EPR spectra were done. Free radical concentrations were determined. Microwave saturation EPR analysis is proposed as useful method to determine the best conditions of storage of sterilized drugs.
Źródło:
Journal of Medical Informatics & Technologies; 2010, 15; 185-191
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Separation of groups of free radicals from noised EPR spectrum using genetic algorithm and gradient method
Autorzy:
Bernas, M.
Ramos, P.
Powiązania:
https://bibliotekanauki.pl/articles/951652.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
signal filtering
genetic algorithms
spectra analysis
free radicals
EPR spectroscopy
function approximation
filtrowanie sygnału
algorytmy genetyczne
analiza widma
wolne rodniki
spektroskopia EPR
aproksymacja funkcji
Opis:
Different groups of free radicals exist in biological material like animal tissues or plants parts. The processes like heating or cooling creates additional types of free radicals groups in this organic matter, due to changes in chemical bonds. The paper proposes a method to determine types and concentrations of different groups of free radicals in the matter processed in various temperatures. The method extracts the spectrum of free radicals using electron paramagnetic resonance with the microwave power of 2.2 mW. Then an automatic method to find a best possible fit using limited number of theoretical mathematical functions is proposed. The match is found using spectrum filtration, and a genetic algorithm implementation supported by a Gradient Method. The obtained results were compared against the samples prepared by an expert. Finally, some remarks were given and new possibilities for future research were proposed.
Źródło:
Journal of Medical Informatics & Technologies; 2013, 22; 117-123
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Epidemiology of animal bites and other potential rabies exposures and anti-rabies vaccine utilization in a rural area in Southern Ethiopia
Autorzy:
Ramos, J.M.
Melendez, N.
Reyes, F.
Gudiso, G.
Biru, D.
Fano, G.
Aberra, G.
Tessema, D.
Tesfamariam, A.
Balcha, S.
Gutierrez, F.
Powiązania:
https://bibliotekanauki.pl/articles/52238.pdf
Data publikacji:
2015
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2015, 22, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Portuguese version of the Swedish Occupational Fatigue Inventory (SOFI) among assembly workers: Cultural adaptation, reliability and validity
Autorzy:
Santos, Joana
Carvalhais, Carlos
Ramos, Catarina
Coelho, Tiago
Monteiro, Pedro R.
Vaz, Mário A.
Powiązania:
https://bibliotekanauki.pl/articles/2161877.pdf
Data publikacji:
2017-05-08
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
reliability
confirmatory factor analysis
validity
cultural adaptation
perceived fatigue
Swedish Occupational Fatigue Inventory
Opis:
Objectives Reliable and valid instruments are essential for understanding fatigue in occupational settings. This study analyzed the psychometric properties of the Portuguese version of the Swedish Occupational Fatigue Inventory (SOFI). Material and Methods A cross-sectional study was conducted with 218 workers from an automotive industry involved in assembly tasks for fabrication of mechanical cables. Convergent and discriminant validity, internal consistency reliability and confirmatory factor analysis were performed. Results Results showed adequate fit to data, yielding a 20-item, 5-factor structure (all intercorrelated): Chi²/df (ratio Chi² and degrees of freedom) = 2.530, confirmatory fit index (CFI) = 0.919, goodness of fit index (GFI) = 0.845, root mean square error of approximation (RMSEA) = 0.084. The SOFI presented an adequate internal consistency, with the sub-scales and total scale presenting good reliability values (Cronbach’s α values from 0.742 to 0.903 and 0.943 respectively). Conclusions Findings suggest that the Portuguese version of the SOFI may be a useful tool to assess fatigue and prevent work-related injuries. In future research, other instruments should be used as an external criterion to correlate with the SOFI dimensions. Int J Occup Med Environ Health 2017;30(3):407–417
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2017, 30, 3; 407-417
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of the physicochemical, performance, and consumer-information characteristics of commercial nonmedicated shampoo for dogs
Autorzy:
Peña-Corona, S.I.
Juárez-Rodríguez, I.
Vargas-Estrada, D.
Amador-González, E.
Arvizu-Tovar, L.
Soberanis-Ramos, O.
Powiązania:
https://bibliotekanauki.pl/articles/16539147.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
veterinary shampoo
quality control
sensory evaluation
performance evaluation
label
animal welfare
dog bath
Opis:
The aim was to analyze the quality of commercial shampoo without prophylactic effect for dogs. The analysis was based on the evaluations and requirements established for human-line products since there is no guide for veterinary products in Mexico; such evaluations have not been carried out or published in Mexico. Physicochemical, sensory, performance, and consumer information tests of the shampoo were carried out. The sample consisted of twenty products marketed in Mexico City. During the evaluation of the label, a serious non-compliance with applicable regulations was found. The pH of the products ranged between 5.6 and 8.4; Significant differences (p<0.05) were found between the three groups with low (6.1), medium (7.2), and high (8.1) pH. Viscosity values were from 1131 to 3102. For the foam index, no statistically significant differences were found. 100% of the products analyzed complied with the rest of the quality tests carried out. The results of the quality analysis in this study will allow veterinarians specializing in small species to better select and recommend the products for their use and inform dog owners, about the safety, and value of the products.
Źródło:
Polish Journal of Veterinary Sciences; 2022, 25, 2; 213-221
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High performance quantum key distribution prototype system using a commercial off-the-shelf solution: experimental and emulation demonstrations
Autorzy:
Lopez-Leyva, J. A.
Ruiz-Higuera, J.
Arvizu-Mondragon, A.
Santos-Aguilar, J.
Ramos-Garcia, R.
Ponce-Camacho, M.
Powiązania:
https://bibliotekanauki.pl/articles/174150.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
quantum cryptography
final secret key rate
FSecKR
coherent states
Opis:
A continuous variable-quantum key distribution system prototype that uses weak coherent states with a diffused phase, commercial off-the-shelf devices, complete free space 90-degrees hybrid and simplified quantum protocol is proposed in this paper. In general, the quantum transmitter-receiver shows an experimental average quantum bit error rate of 30% using auto-homodyne detection with 0.25 photons per pulse in locking phase mode. The emulated final secret key rate measurements were 20 and 40 Kbps for minimum (30 Mbps) and maximum (90 Mbps) throughput, respectively, in a real traffic network using databases for the quantum keys generated by two true random number generators.
Źródło:
Optica Applicata; 2017, 47, 3; 411-419
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie właściwości wolnych rodników w streptomycynie sterylizowanej radiacyjnie i termicznie
Comparison of free radicals properties in radiosterilised and thermal sterilized streptomycin
Autorzy:
Wilczyński, S.
Ramos, P.
Pilawa, B.
Ptaszkiewicz, M.
Swakoń, J.
Olko, P.
Powiązania:
https://bibliotekanauki.pl/articles/283986.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
wolne rodniki
sterylizacja termiczna
sterylizacja radiacyjna
streptomycyna
EPR
free radicals
thermal sterilization
radiosterilization
streptomycin
Opis:
Sterylność substancji leczniczej jest niezwykle istot-na z punktu widzenia bezpieczeństwa farmakoterapii. Sterylizacja leków może powodować powstawanie wolnych rodników. Porównano właściwości wolnych rodników powstających pod wpływem promieniowania termicznego (180°C/30 minut) i promieniowania gamma (25kGy) w streptomycynie. Badania prze-prowadzono przy użyciu techniki elektronowego rezonansu paramagnetycznego EPR na pasmo X. Zarówno dla próbek sterylizowanych termicznie jak i radiacyjnie zarejestrowano szerokie linie EPR. Obydwie metody sterylizacji prowadzą do powstania wysokich koncentracji wolnych rodników (1016–1018 spin/g). Porównanie parametrów linii EPR dla sterylizacji termicznej i radiacyjnej wskazuje na podobne właściwości wolnych rodników w sterylizowanej próbce – niesparowane elektrony zlokalizowane na atomie tlenu. Więcej wolnych rodników, w przypadku zastosowanych parametrów sterylizacji, powstaje w próbkach sterylizowanych radiacyjnie.
Sterility of medical substances plays significant role from the point of view of pharmacotherapy safety. Drugs sterilization can cause free radicals forming. It was compared free radicals properties forming in streptomycin under the influence thermal radiation (180°C/30 minutes) and gamma radiation (25kGy). Presented studies were performed by use of X band electron paramagnetic spectrometer. Both for thermal sterilized samples as well as for radiosterilized broad EPR lines were recorded. Both methods of sterilization lead to forming of high concentrations of free radicals (1016–1018spin/g). Comparing of EPR lines parameters for thermal sterilization and radiosterilization point at similar free radicals properties in the studied samples – unpaired electrons located on oxygen atoms. More free radicals, in case of used sterilization parameters, create in radiosterilized samples.
Źródło:
Engineering of Biomaterials; 2009, 12, no. 89-91; 171-173
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania FT-IR i EPR zmian struktury chemicznej ampicyliny podczas sterylizacji termicznej
FT-IR and EPR studies of changes of chemical structure of ampicyline during thermal sterilization
Autorzy:
Krztoń, A.
Liszka, B.
Ramos, P.
Pilawa, B.
Powiązania:
https://bibliotekanauki.pl/articles/284230.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
ampicylina
sterylizacja termiczna
FTIR
wolne rodniki
EPR
ampicyline
thermal sterilization
free radicals
Opis:
Zbadano zmiany struktury chemicznej oraz generowanie wolnych rodników w ampicylinie podczas sterylizacji w temperaturach 160 stopni C, 170 stopni C i 180 stopni C. Jako metody badawcze zastosowano spektroskopię FT-IR i EPR.. Wykazano, że sterylizacja w temperaturach od 160 stopni C do 180 stopni C powadzi do zmian struktury chemicznej ampicyliny oraz powoduje powstawanie dużej ilości wolnych rodników w próbce. Widma FT-IR uwidaczniają częściową degradację grupy karboksylowej w trakcie ogrzewania leku. Zależność kształtu widm EPR od mocy mikrofalowej wskazuje na złożony charakter układu centrów paramagnetycznych sterylizowanej ampicyliny.
Changes of chemical structure and formation of free radicals in ampicyline during sterilization at temperatures 160 degrees of C, 170 degrees of C, and 180 degrees of C were studied. FT-IR and EPR were applied as experimental methods. It was proved that sterilization at temperatures from 160 degrees of C to 180 degrees of C lead to changes of chemical structure of the ampicyline and causes formation of high amount of free radicals. FT-IR spectra show that carboxyl groups are partly evolved during heating of this drug. Dependence of lineshape of EPR spectra on microwave power indicates complex character of paramagnetic centers system of ampicyline.
Źródło:
Engineering of Biomaterials; 2009, 12, no. 89-91; 154-157
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High performance type-II InAs/GaSb superlattice infrared photodetectors with a short cut-off wavelength
Autorzy:
Delmas, Marie
Ramos, David
Ivanov, Ruslan
Žurauskaitė, Laura
Evans, Dean
Rihtnesberg, David
Almqvist, Susanne
Becanovic, Smilja
Costard, Eric
Höglund, Linda
Powiązania:
https://bibliotekanauki.pl/articles/2204225.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
infrared detectors
short-wavelength infrared
InAs/GaSb superlattice
type-II superlattice
Opis:
This work investigates the potential of InAs/GaSb superlattice detectors for the shortwavelength infrared spectral band. A barrier detector structure was grown by molecular beam epitaxy and devices were fabricated using standard photolithography techniques. Optical and electrical characterisations were carried out and the current limitations were identified. The authors found that the short diffusion length of ~1.8 µm is currently limiting the quantum efficiency (double-pass, no anti-reflection coating) to 43% at 2.8 µm and 200 K. The dark current density is limited by the surface leakage current which shows generation-recombination and diffusion characters below and above 195 K, respectively. By fitting the size dependence of the dark current, the bulk values have been estimated to be 6.57·10ˉ⁶ A/cm² at 200 K and 2.31·10ˉ⁶ A/cm² at 250 K, which is only a factor of 4 and 2, respectively, above the Rule07.
Źródło:
Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144555
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Can angiotensin-converting enzyme inhibitors interfere with the free radicals? Measurement of antioxidant capacity using DPPH radical reduction examined by UV-VIS method
Autorzy:
Ramos, Paweł
Juszczak, Anna
Szczołko, Wojciech
Pilawa, Barbara
Stanisz, Beata J.
Powiązania:
https://bibliotekanauki.pl/articles/895342.pdf
Data publikacji:
2019-04-30
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
free radicals
antioxidant
UV-Vis spectrophotometry
angiotensin-converting enzyme inhibitors (ACE-I)
Opis:
A negative impact of radicals on human’s health is responsible for growing research interest in antioxidant properties of substances, which protect organisms from the damaging influence of these reactive species. Angiotensin-converting enzyme inhibitors (ACE-I) are the most popular drugs used in cardiovascular diseases. There are a lot of clinical reports that ACE-I have antioxidant properties, due to the fact, that prolonged use improves conditions of patients with neurodegenerative disorders and slow inflammatory processes. The paper shows the antioxidant properties of a selected ACE-I: cilazapril, ramipril, imidapril, lisinopril, perindopril, and quinapril. Among numerous methods for antioxidant activity estimation, DPPH reduction is the most popular and commonly used one due to its ease, speed, sensitivity and the usage of stable radicals. UV-Vis spectrophotometry was used to examine interactions of chosen ACE-I with model-free radicals. Absorption of UV-Vis spectra of DPPH (reference), and DPPH interacting with the tested ACE-I were compared. For all tested ACE-I kinetics of their interaction with DPPH, up to 30 minutes, were obtained. The strongest interaction with DPPH was observed for imidapril and cilazapril and the lowest interaction for lisinopril. Studies have shown usefulness UV-Vis spectrophotometry for obtaining information on interactions of ACE-I with model-free radicals.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 2; 233-239
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnosis of cutaneous anthrax in resource-poor settings in West Arsi Province, Ethiopia
Autorzy:
Pérez-Tanoira, Ramón
Ramos, Jose Manuel
Prieto-Pérez, Laura
Tesfamariam, Abraham
Balcha, Seble
Tissiano, Gabre
Cabello, Alfonso
Cuadros, Juan
Rodríguez-Valero, Natalia
Barreiro, Pablo
Reyes, Francisco
Górgolas, Miguel
Powiązania:
https://bibliotekanauki.pl/articles/986707.pdf
Data publikacji:
2017
Wydawca:
Instytut Medycyny Wsi
Tematy:
bacillus anthracis
cutaneous anthrax
ethiopia
Opis:
Introduction. Cutaneous anthrax is a zoonotic disease caused by the spore-forming bacterium Bacillus anthracis, which typically presents with ulcers after contact with animals or animal products, and is rarely seen in high-income countries but is common in those with low- and middle-incomes. Objective. The aim of this study is to show the main clinical characteristics of cutaneous anthrax in endemic areas. Materials and method. The study describes the main clinical characteristics of cutaneous anthrax in eight patients (six female and two male, age range 1 – 56 years) admitted to the rural General Hospital of Gambo, West Arsi Province of Ethiopia from 2010–2013. Results. In all cases, lesions began as an erythematous papule located on exposed sites (n=7 head; n=1 thigh) and subsequently became a necrotic black eschar surrounded by an edematous halo. Two patients presented with painful ipsilateral adenopathy near the black eschar. Four patients developed a malignant pustule on the suborbital region of the face. Patients responded positively to treatment, and the lesions resolved, leaving eschars. However, one patient suffered the loss of an eyeball, and another died 12 hours after starting treatment. Conclusions. Physicians working in rural areas of resource-poor settings should be trained in the clinical identification of cutaneous anthrax. Early antibiotic treatment is essential for decreasing morbidity and mortality.
Źródło:
Annals of Agricultural and Environmental Medicine; 2017, 24, 4
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena koncentracji, trwałości i typu wolnych rodników powstających w tramadolu pod wpływem wysokiej temperatury
Evaluation of concentration, stability and types of free radicals generated in tramadole exposed to high temperature
Autorzy:
Pilawa, B.
Wilczyński, S.
Ramos, P.
Tomasik, A.
Powiązania:
https://bibliotekanauki.pl/articles/283751.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
wolne rodniki
tramadol
leki
free radicals
tramadole
drugs
Opis:
Wpływ wysokiej temperatury na substancje biologicznie czynne jest szczególnie istotny w kontekście termicznej sterylizacji leków. Wysoka temperatura, zabójcza dla mikroorganizmów, może powodować zrywanie się wiązań chemicznych a co za tym idzie powstawanie produktów rozpadu. Wśród produktów rozpadu powstających pod wpływem działania wysokiej temperatury w substancjach leczniczych szczególne miejsce zajmują wolne rodniki. Ich wyjątkowa pozycja wynika z faktu, iż nawet niewielkie koncentracje wolnych rodników mogą powodować niebezpieczne następstwa podczas farmakoterapii zanieczyszczonymi substancjami leczniczymi. Ważny jest fakt, że wolne rodniki mogą negatywnie wpływać na pacjenta nawet w bardzo niewielkich stężeniach. Dotyczy to zwłaszcza leków podawanych parenteralnie, między innymi tramadolu. Tramadol jest syntetycznym lekiem przeciwbólowym o opioidowym i nieopioidowym mechanizmie działaniu [1-2]. Metodą, która pozwala na ilościowe oraz jakościowe pomiary wolnych rodników w termicznie sterylizowanych lekach jest spektroskopia elektronowego rezonansu paramagnetycznego EPR. Sterylizację termiczną tramadolu wykonano w suszarce z wymuszonym obiegiem powietrza w temperaturze 180°C. Czas sterylizacji wynosił 30 minut. Próbki miały postać sproszkowaną. Pomiary EPR wykonano za pomocą spektrometru elektronowego rezonansu paramagnetycznego na pasmo X (9.3GHz) produkcji RADIOPAN - Poznań. Zastosowano modulację pola magnetycznego wynoszącą 100kHz. Częstotliwość promieniowania mikrofalowego rejestrowano miernikiem MCM 101 produkcji RADIOPAN - Poznań. Widma EPR rejestrowano w postaci pierwszej pochodnej absorpcji przy wysokim tłumieniu 15dB, aby uniknąć nasycenia mikrofalowego linii. Całkowita moc mikrofalowa wytwarzana przez klistron wynosiła około 2.2mW. Wyznaczono następujące parametry widm EPR: amplitudę linii, szerokość linii oraz współczynnik rozszczepienia spektroskopowego g. Określono również koncentrację wolnych rodników oraz ich stabilność. Wzorcem zewnętrznym służącym wyznaczeniu koncentracji wolnych rodników w termicznie sterylizowanym tramadolu była ultramaryna. Natomiast wzorcem pomocniczym na trwale umieszczonym we wnęce rezonansowej był kryształ rubinu. Określono także wpływ mocy mikrofalowej na podstawowe parametry widm EPE - amplitudę i szerokość linii EPR. Dla tramadolu nie poddanego obróbce termicznej, nie obserwowano widm EPR. Oznacza to, że w badanej substancji leczniczej nie występują trwałe centra paramagnetyczne. Widma EPR badanego leku sterylizowanego w temperaturze 180°C stanowią asymetryczne szerokie linie (RYS. 1), co wskazuje na silne oddziaływania magnetyczne spin-spin w sterylizowanym termicznie tramadolu. Oddziaływania te poszerzają linie EPR i są charakterystyczne dla wolnych rodników położonych blisko siebie w strukturze molekularnej leku. Zarejestrowano wpływ mocy mikrofalowej na amplitudę i szerokość linii EPR. Taki charakter zmian (RYS. 2) wskazuje, że wolne rodniki w termicznie sterylizowanym tramadolu są rozmieszczone jednorodnie w całej objętości próbki. Zaobserwowano wpływ czasu przechowywania na koncentracje wolnych wodników (proporcjonalną do wartości amplitudy linii EPR) w termicznie sterylizowanym tramadolu (RYS. 3). Ilość wolnych rodników maleje w kolejnych dniach pomiarowych. Zjawisko to może być związane z procesami rekombinacji pomiędzy blisko siebie położonymi wolnymi rodnikami oraz interakcji z paramagnetycznym tlenem atmosferycznym. Nie zaobserwowano wpływu czasu przechowywania na szerokość linii EPR tramadolu. Wyznaczono współczynnik rozszczepienie spektroskopowego g świadczący o typie wolnych rodników znajdujących się w próbce. Otrzymany wynik g=0,0027 sugeruje, że niesparowane elektrony zlokalizowane są na atomach tlenu. Nie zaobserwowano wpływu czasu przechowywania na średni współczynnik rozszczepienia spektroskopowego g. Wszystkie przedstawione dane wskazują, że wysoka temperatura (180°C) powoduje generowanie się dużej ilości wolnych rodników. Asymetryczne, złożone linie EPR wskazują na istnienie kilku typów wolnych rodników w tramadolu poddanemu obróbce termicznej. Poszerzenie dipolowe linii EPR sugerują niewielkie odległości pomiędzy wolnymi rodnikami. Nasycenie mikrofalowe widm EPR wskazuje na jednorodne rozmieszczenie wolnych rodników w sterylizowanym termicznie tramadolu. Wraz z czasem przechowywania koncentracja wolnych rodników maleje.
Influence of high temperature on biologic active substances is particularly important in context of thermally sterilized drugs. High temperature, lethal for microorganisms, can cause cleavage of chemical bonds and consequent degradation products forming. Among degradation products formed under the influence of high temperature, free radicals are particularly important. Its special status result from fact that even very few free radicals concentrations can cause dangerous sequences during contaminated substances pharmacotherapy. It is important that free radicals even in very few concentrations can have negative influence on patients. It concerns especially parenterally administrated drugs, inter alia tramadole. Tramadole is a synthetic drug that acts analgesic with opioid and non-opioid effect [1,2]. EPR spectroscopy brings information about types and amount of free radicals in thermally sterilized drugs. Thermal sterilization of tramadole was performed in hot air oven with air circulating at 180°C. Sterilization was performed during 30 minutes. Powdered samples were analyzed. Measurements of EPR spectra were done by the use of EPR spectrometer produced by RADIOPAN Firm (Poznań). Modulation of magnetic field of 100kHz was applied. Microwave frequency was evaluated using MCM 101 frequency recorder produced by RADIOPAN - Poznań. The first-derivative EPR spectra were recorded with high microwave power attenuation 15dB to avoid the microwave saturation. Total microwave power produced by klystron was about 2.2mW. The following EPR parameters were determined: amplitude, linewidth and g-factor. Free radicals concentration and stability were also evaluated. Ultramarine was used as reference of paramagnetic centers concentration. A ruby crystal, permanently placed in resonance cavity, was the second reference. Influence of microwave power on basic EPR parameters: amplitude and linewidth of EPR lines were tested. For not heated tramadole EPR spectra were not observed. It indicates absence of stabile paramagnetic centers in initial substance. EPR spectra of the studied drug sterilized at 180°C have asymmetric, broad lines what indicates strong spin-spin magnetic interactions in thermally sterilized tramadole. These interactions causing broadening EPR lines and are characteristic for close located free radicals in molecular structure of the drug. Influence of microwave power on EPR line amplitude was observed. This kind of relationship indicates that free radicals in thermally sterilized tramadole are homogenously located in whole sample volume. Influence of sample storage on free radicals concentration (proportionally to amplitude value) was observed. This phenomenon can be related with recombination processes between close located to each other free radicals and interactions with paramagnetic oxygen molecules. Influence of time of storage on EPR linewidths was not observed. g-factor, free radical type determining, was evaluate. Determined result g=2.0027, suggest that unpaired electrons are located on oxygen atoms. Influence of time of storage on average g - factor value was not observed. All presented data point that high temperature (180°C) cause big amount of free radicals creating. Asymmetric, complex EPR lines indicate on few types of free radicals existing in tra- madole expose to high temperature. Dipole boarded EPR lines suggest little distance between free radicals. Microwave saturation of EPR lines indicates homogeneous distribution of free radicals in thermally sterilized tramadole. Free radicals concentration decrease with increasing time of storage.
Źródło:
Engineering of Biomaterials; 2008, 11, no. 81-84; 63-64
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concept Maps and Obliteration in Bilinguals
Autorzy:
Gómez Ramos, José Luis
Bravo Palomares, Silvia María
Powiązania:
https://bibliotekanauki.pl/articles/43467352.pdf
Data publikacji:
2024
Wydawca:
Uniwersytet Dolnośląski DSW. Wydawnictwo Naukowe DSW
Tematy:
concept maps
long-term memory
CLIL
bilingual education
instructional design
Opis:
This study examines the effectiveness of concept maps in promoting long-term memory among Content and Language Integrated Learning (CLIL) students. It focuses on the accuracy of content transmission and the acquisition of meaningful learning in bilingual education by connecting new and carefully organized information to students' prior knowledge. Thus, the research assesses the use of concept maps as instructional tools in foreign language (L2, or 'second language') settings, addressing a lack of evidence regarding their effectiveness. It also considers how concept mapping affects long-term memory through factors such as perception, processing, cognition, and transfer. The study examines how bilingualism, bilingual education, and curricular content influence instructional design when using concept maps. The study involved 60 Spanish primary education students attending a semi-public bilingual school. The research results aim to contribute to the development of effective teaching strategies and instructional design in CLIL classrooms, ultimately enhancing students' long-term memory and learning outcomes.
Źródło:
Teraźniejszość – Człowiek – Edukacja; 2024, 26, 1(95); 9-32
1505-8808
2450-3428
Pojawia się w:
Teraźniejszość – Człowiek – Edukacja
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ ogrzewania w temperaturze 180°C na paramagnetyczne właściwości diklofenaku - badania EPR
Effect of heating at 180°C on paramagnetic properties of diclofenac - EPR studies
Autorzy:
Ramos, P.
Pilawa, B.
Wilczyński, S.
Czyż, K.
Adamczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/284672.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
diklofenak
centra paramagnetyczne
wolne rodniki
spektroskopia EPR
diclofenac
paramagnetic centers
free radicals
EPR spectroscopy
Opis:
Przeprowadzono badania wolnych rodników powstających w diklofenaku podczas ogrzewania w temperaturze 180°C. Jako technikę badawczą zastosowano spektroskopię elektronowego rezonansu paramagnetycznego (EPR). Dla wyjściowej próbki diklofenaku nie poddanego obróbce termicznej nie obserwowano widm EPR. Asymetryczne linie EPR rejestrowano natomiast w przypadku ogrzewanego diklofenaku. Zbadano wpływ czasu przechowywania na właściwości i koncentrację wolnych rodników w ogrzewanym diklofenaku. Stwierdzono, że w diklofenaku poddanym obróbce termicznej występuje duża ilość wolnych rodników (∼10(19) spin/g). Koncentracja wolnych rodników w ogrzewanym diklofenaku rośnie podczas przechowywania próbki. Oddziaływania wolne rodniki - tkanki mogą być odpowiedzialne za efekty toksyczne w organizmie oraz zmiany struktury biomateriałów. Obróbkę termiczną w przypadku diklofenaku należy więc odrzucić jako metodę sterylizacji leku. W pracy opisano wpływ mocy mikrofalowej na kształt, amplitudę i szerokość linii EPR dikofenaku. Metodą ciągłego nasycenia mikrofalowego linii EPR wykazano, że w diklofenaku zachodzą wolne procesy relaksacji spin-sieć.
Electron paramagnetic resonance (EPR) examinations of free radicals formed in diclofenac heated at 180°C were performed. EPR spectrum for the non-heated sample was not obtained. Asymmetrical EPR lines were measured for the studied heated drug. Properties and free radicals concentration in heated diclofenac during storage of the sample were studied. High amount of free radicals (∼10(19) spin/g) characterizes diclofenac after heating of the sample. Free radicals concentration in heated diclofenac increases with increasing storage time of the sample. Free radicals - tissues interactions may be accompanied by toxic effects in organisms and changes of biomaterial's structure, so thermal sterilization is rather rejected as sterlization process for diclofenac. Influence of microwave power on lineshape, amplitudes and linewidth of EPR spectra was described. Continuous microwave saturation of EPR lines points out that slow spin-lattice relaxation processes exist in the heated diclofenac.
Źródło:
Engineering of Biomaterials; 2009, 12, 87; 7-12
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure, Morphology and Electrical Properties of CaTiO3 Ceramics Synthesized by the Solid-State Reaction Method
Autorzy:
Rocha-Rangel, E.
López-Hernández, J.
Castillo-Martínez, J. A.
Osorio-Ramos, J. J.
Calles-Arriaga, C. A.
Estrada-Guel, I.
Martínez-Sánchez, R.
Powiązania:
https://bibliotekanauki.pl/articles/352238.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CaTiO3
solid state synthesis
electrical properties
insulating ceramics
Opis:
In this paper, explain the preparation of CaTiO3 ceramics synthesized by the solid-state reaction method. Calcium carbonate and titanium dioxide were high energy mixed in stoichiometric amounts, and the obtained mixture was calcined at different temperatures (800, 900, 1000 and 1300ºC) for 2h. The obtained samples were characterized by measurement of particle size, Energy Dispersive X-Ray (EDX) Analysis; differential thermal analysis, X-ray diffraction and SEM images. XRD patterns indicated that CaTiO3 ceramics with the structure of perovskite is obtained from calcined powders at 1,300°C for 2h. SEM images show the formation of a very fine and homogeneous morphology. The measured values of electrical resistivity were within the typical range of insulating materials and approach values corresponding to insulating ceramics.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1749-1753
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THE INFLUENCE OF STORAGE TEMPERATURE AND UV-IRRADIATION ON FREE RADICAL SCAVENGING PROPERTIES OF ETHANOLIC EXTRACTS OF PROPOLIS
Autorzy:
Komosińska-Vassev, Katarzyna
Olczyk, Paweł
Ramos, Paweł
Mencner, Lukasz
Derkacz, Alicja
Waluga, Ewa
Krysik, Katarzyna
Olczyk, Krystyna
Pilawa, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/895577.pdf
Data publikacji:
2018-01-31
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
EPR spectroscopy
DPPH
free radical scavenging
ethanol extracts of propolis
UV-irradiation
Opis:
The free radical scavenging activity of ethanolic extracts of propolis (EEP) at the concentrations of 3%, 7%, and 10% was examined. The impact of storage temperature and exposure to ultraviolet (UV) light on the interactions of extracts of propolis with the model DPPH free radicals was also determined. The quenching of an X-band electron paramagnetic resonance spectra of DPPH free radicals by the extracts stored at room temperature, heated at the temperature of 50 oC and exposed to UV-irradiation, were compared. The examined propolis ethanolic extracts revealed an antioxidative character. The storage of the samples at a higher temperature (50 oC) caused a decrease of the scavenging activity equaling to 7% and 10% EEP. UV-irradiation of the 3% EEP increased the quenching of DPPH free radical lines. The reverse effect was observed for the 7% and 10% propolis extracts. The 3% ethanolic extract of propolis is more stable for storage at 50ºC, and less than other analyzed EEP susceptible for UV-irradiation. Alterations of the antioxidative properties of the analyzed EEP and changes in the kinetics of their interactions with free radicals, indicate that 3%, 7%, and 10% propolis extracts should not be exposed to the temperature of 50 oC and UV-irradiation.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2018, 74, 6; 1833-1840
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of ultrasonic soldering of Ti and Ni with Ni/Al reactive multilayer deposition
Charakterystyka ultradźwiękowego lutowania Ti i Ni z reaktywnym osadzaniem wielowarstwowym Ni/Al
Autorzy:
Hodulova, Erika
Ramos, Ana Sofia
Kolenak, Roman
Kostolny, Igor
Simekova, Beata
Kovarikova, Ingrid
Powiązania:
https://bibliotekanauki.pl/articles/115196.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
osadzanie reaktywne
osadzanie wielowarstwowe
lutowanie ultradźwiękowe
reactive deposition
multilayer deposition
ultrasonic soldering
Opis:
The joining of Ti and Ni at low temperatures was analysed in this work. For joining pure Ti and Ni coins of 1.5 mm in thickness were used. Reactive multilayer thin films/foils with nanometric period (bilayer thickness), in particular Ni/Al multilayers, have been used to promote joining in two thickness of 28 and 55 nm. The ultrasonic soldering with SnAgTi active solder has been used for “hard-to-solder” material. The structural evaluation of soldered joint was studied by optical microscopy and EDX analysis. The structural analysis was focused to the creation of intermetallic layers in the joint interface. The mechanical properties of solder joints were tested by shear strength.
W pracy przeanalizowano łączenie Ti i Ni w niskich temperaturach. Do łączenia użyto czystych monet Ti oraz Ni o grubości 1,5 mm. Reaktywne wielowarstwowe cienkie powłoki z okresem nanometrycznym (grubość dwuwarstwowa), w szczególności wielowarstwowe Ni/Al, zastosowano do promowania łączenia w dwóch grubościach 28 i 55 nm. Lutowanie ultradźwiękowe z aktywnym lutem SnAgTi zastosowano do materiałów "trudnych do lutowania". Ocenę strukturalną lutowanego złącza zbadano za pomocą mikroskopii optycznej i analizy EDX. Analiza strukturalna koncentrowała się na tworzeniu warstw międzymetalicznych na granicy faz złącza. Właściwości mechaniczne złączy lutowanych zbadano na wytrzymałość na ścinanie.
Źródło:
Welding Technology Review; 2019, 91, 9; 51-57
0033-2364
2449-7959
Pojawia się w:
Welding Technology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oxide Layer Evolution of Cast Fe24Cr12NiXNb Heat-Resistant Cast Steels at 900°C in Atmospheric Air
Autorzy:
Ramos, P. A.
Coelho, R. S.
Pinto, H. C.
Soldera, F.
Mücklich, F.
Brito, P. P.
Powiązania:
https://bibliotekanauki.pl/articles/1837826.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
austenitic cast steel
microstructure
Nb-alloyed steels
oxidation
staliwo austenityczne
mikrostruktura
stal stopowa
utlenianie
Opis:
The austenitic stainless steels are a group of alloys normally used under high mechanical and thermal requests, in which high temperature oxidation is normally present due to oxygen presence. This study examines the oxide layer evolution for Fe24Cr12NiXNb modified austenitic stainless steel A297 HH with 0,09%Nb and 0,77%Nb content at 900°C under atmospheric air and isothermal oxidation. The modifiers elements such as Mo, Co and Ti, added to provide high mechanical strength, varied due to the casting procedure, however main elements such as Cr, Ni, Mn and Si were kept at balanced levels to avoid microstructure changing. The oxide layer analysis was performed by confocal laser scanning microscopy (CLS) and scanning electron microscopy (SEM). The elemental analysis of the different phases was measured with energy dispersive X-ray spectroscopy (EDX). The Nb-alloyed steel generated a thicker Cr oxide layer. Generally elemental Nb did not provide any noticeable difference in oxide scale growth, for the specific range of Nb amount and temperature studied. High temperature oxidation up to 120h was characterized by protective Cr oxidation, after this period a non-protective Fe-based oxidation took place. Cr, Fe and Ni oxides were observed in the multilayer oxide scale.
Źródło:
Archives of Foundry Engineering; 2021, 21, 1; 125-131
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of air profiling and frother concentration on a flotation bank performance
Autorzy:
Maldonado, Miguel
Ramos, Ignacio
Pinto, Alonso
Gomez, Cesar O.
Powiązania:
https://bibliotekanauki.pl/articles/29596463.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation banks
air profiling
frother
Opis:
The impact of air distribution on the metallurgical performance of a flotation bank operating with a mineral slurry having a moderate and high frother concentration is assessed. A flotation bank of two and three 5L Denver cells was implemented, and air flow was distributed down the bank as increasing and decreasing profiles. It was observed that when operating the bank configurations with a moderate frother concentration (10 ppm DF 400) the increasing profile provided the highest Cu enrichment ratio at the expense of a slight reduction in Cu recovery. This increase in selectivity was mainly due to a significant reduction in the water recovery and mass-pull in the first cell. When the bank operated with a high frother concentration, i.e., well beyond the CCC, a significant increase in water recovery was observed, producing a significant loss in selectivity that could not be compensated by air profiling.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 186274
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ESTATUTO DA METRÓPOLE E GESTÃO DE AGLOMERADOS URBANOS NO BRASIL
Statute of the Metropolis and Management of Urban Agglomerations in Brazil
Autorzy:
MOULIN S. PENALVA SANTOS, Angela
RAMOS PRADO VASQUES, Pedro Henrique
Powiązania:
https://bibliotekanauki.pl/articles/486088.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
política urbana
federalismo
coordenação interfederativa
Estatuto da Metrópole
aglomerações urbanas
Urban policy
federalism
interfederative coordination
Statute of the Metropolis
urban agglomerations
Opis:
O Brasil está organizado como uma federação tripartite, em que os municípios lograram a condição de entes federativos e responsáveis pela política urbana. Esta, no entanto, não se resume à ordenação do uso do solo, mas também a políticas setoriais, como o saneamento, a habitação e mobilidade, que geralmente extravasam as fronteiras municipais. Nesse contexto, a lei do Estatuto da Metrópole veio preencher uma lacuna nas formas de coordenação interfederativa para a gestão de territórios que constituem aglomerações urbanas, mas não são entes federativos. Trata-se de um importante avanço normativo que, no entanto, está a espera de avanços na cooperação federativa para o financiamento dos serviços de interesse interfederativo.
Brazil is politically and administratively organized as a tripartite federation, in which municipalities have achieved the status of federative entities and are now responsible for the urban policy. This, however, is not just about land use planning, but it also concerns sectoral policies such as sanitation, housing and mobility, which often go beyond municipal boundaries. In this context, the Statute of the Metropolis Act has filled a gap in the forms of interfederative coordination for the management of territories that constitute urban agglomerations, but are not federal entities. This is an important policy development, however, which is still awaiting progress in the federative cooperation for the financing of interfederative interest services.
Źródło:
Revista del CESLA. International Latin American Studies Review; 2016, 19; 125-152
1641-4713
Pojawia się w:
Revista del CESLA. International Latin American Studies Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-step etch in n-on-p type-II superlattices for surface leakage reduction in mid-wave infrared megapixel detectors
Autorzy:
Ramos, David
Delmas, Marie
Ivanov, Ruslan
Žurauskaitė, Laura
Evans, Dean
Almqvist, Susanne
Becanovic, Smilja
Hellström, Per-Erik
Costard, Eric
Höglund, Linda
Powiązania:
https://bibliotekanauki.pl/articles/2204214.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
infrared detector
surface leakage
type-II superlattice
megapixel
n-on-p
Opis:
This work investigates the potential of p-type InAs/GaSb superlattice for the fabrication of full mid-wave megapixel detectors with n-on-p polarity. A significantly higher surface leakage is observed in deep-etched n-on-p photodiodes compared to p-on-n diodes. Shallowetch and two-etch-step pixel geometry are demonstrated to mitigate the surface leakage on devices down to 10 μm with n-on-p polarity. A lateral diffusion length of 16 μm is extracted from the shallow etched pixels, which indicates that cross talk could be a major problem in small pitch arrays. Therefore, the two-etch-step process is used in the fabrication of 1280 × 1024 arrays with a 7.5 μm pitch, and a potential operating temperature up to 100 K is demonstrated.
Źródło:
Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144556
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nitrate Reductase Activity in Eucalyptus urophylla and Khaya senegalensis Seedlings: Optimization of the in vivo Assay
Autorzy:
Barbosa, Mateus Pires
do Bonfim, Raul Antonio Araújo
da Silva, Leandro Dias
Souza, Mikaela Oliveira
de Souza Soares, Poliana Prates
Sá, Milton Carriço
Cairo, Paulo Araquém Ramos
Powiązania:
https://bibliotekanauki.pl/articles/2027823.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
nitrogen assimilation
enzymatic activity
in vivo assay
woody plant
Opis:
Nitrate assimilation in the plant cell is mainly regulated by the enzyme nitrate reductase (EC 1.6.6.1), which catalyzes the nitrate to nitrite reduction. Nitrate reductase activity (NRA) is measured at the major nitrate reduction site, which can be the root or shoot, depending on the species. The in vivo assay has often been used for NRA measurement, and protocol also usually varies with the species. The goals of this study were: (1) to identify the major nitrate reduction site in seedlings of two tree species, Eucalyptus urophylla and Khaya senegalensis, and (2) to optimize the in vivo nitrate reductase assay at the major nitrate reduction site in these species. Healthy seedlings aged 180 and 160 days, respectively, were selected for NRA measurement in fully expanded leaves and main root. After identifying the main nitrate reduction site of each species, the effects of variations in temperature, nitrate concentration and pH in the incubation medium were assessed. The results showed that the leaf and the root are the major nitrate reduction site of Eucalyptus urophylla and Khaya senegalensis, respectively. The optimal conditions for the in vivo assay in the leaf were 35 °C, $KNO_3$ 100 mM, and pH 7.0, whereas for the root they were 30 °C, $KNO_3$ 100 mM, and pH 7.5.
Źródło:
Journal of Ecological Engineering; 2022, 23, 2; 204-211
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A systematic review to determine reliability and usefulness of the field-based test batteries for the assessment of physical fitness in adolescents – The ASSO Project
Autorzy:
Bianco, Antonino
Jemni, Moném
Thomas, Ewan
Patti, Antonino
Paoli, Antonio
Ramos Roque, Joana
Palma, Antonio
Mammina, Caterina
Tabacchi, Garden
Powiązania:
https://bibliotekanauki.pl/articles/2177376.pdf
Data publikacji:
2015-05-26
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
fitness tests
adolescents
health education
ASSO project
physical fitness
school context
Opis:
The aim of the present review is to investigate the main field-based tests, used alone or included in sport or fitness batteries, for the assessment of health- and skill-related physical fitness components in adolescents. Different scientific databases were searched through using the selected key words related to physical fitness and its components for adolescence. The search focused on original articles and reviews/meta-analyses using valid, reproducible and feasible tests that fit within the school environment. A total of 100 scientific manuscripts were included in the qualitative synthesis. The present systematic review pointed out 5 fitness tests that well adapt to the evaluation of the components of physical fitness of adolescents within a school environment: the 20 m shuttle run test for cardio-respiratory endurance; the handgrip strength test for upper body maximal strength; the standing broad jump test for lower body maximal strength; the sit-up test to exhaustion for muscular endurance and the 4×10 m shuttle run test for speed, agility and coordination. These fitness tests have been finally selected and incorporated into the Adolescents and Surveillance System for the Obesity prevention – Fitness Test Battery (ASSO-FTB), and will be adopted within the ASSO Project for evaluation purposes. This instrument could be also provided to teachers and people working in schools in order to assess physical fitness of adolescents over time and prevent obesity and related diseases.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2015, 28, 3; 445-478
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania charakterystyk reologicznych emulsji pierwotnych wykorzystywanych do produkcji szybko rozpadających się tabletkowanych emulsji suchych
A study on rheological characteristics of primary pharmaceutical emulsions used in production of fast disintegrating dry emulsion tablets
Autorzy:
Kulawik, A.
Tal-Figiel, B.
Incinillas-Ramos, N.
Powiązania:
https://bibliotekanauki.pl/articles/2070727.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
charakterystyki reologiczne
emulsje suche
stabilność i starzenie emulsji
rheological characteristics
dry emulsion
emulsion stability and aging
Opis:
Celem pracy jest przedstawienie wyników badań charakterystyk re-ologicznych emulsji pierwotnych wykorzystywanych do otrzymywania szybko rozpadających się tabletkowanych emulsji suchych. Badania reologiczne obejmowały charakterystykę reologiczną (krzywą płynięcia, lepkość emulsji) oraz wpływ rodzaju i stężenia fazy tłuszczowej, emulgatora i innych dodatkowych składników na stabilność i starzenie emulsji.
The study concerns rheological characteristics of primary pharmaceutical emulsions used in obtaining fast disintegrating dry emulsion tablets. An influence of different type of emulsifier, oil phase type and concentration on emulsion stability and aging was investigated.
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 5; 64-66
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of UVC radiation on interaction of selected antifungal drugs (azole derivatives) with model DPPH free radical
Wpływ promieniowania UVC na oddziaływanie z modelowym wolnym rodnikiem DPPH wybranych leków przeciwgrzybiczych pochodnych azoli
Autorzy:
Ramos, Paweł
Pepliński, Piotr
Pilawa, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/1035433.pdf
Data publikacji:
2020
Wydawca:
Śląski Uniwersytet Medyczny w Katowicach
Tematy:
antifungal drugs
free radicals
uvc radiation
uv-vis spectrophotometry
colourimetry
leki przeciwgrzybicze
wolne rodniki
promieniowanie uvc
spektrofotometria uv-vis
kolorymetria
Opis:
INTRODUCTION: Fungal lesions are accompanied by inflammation, during which large amounts of free radicals are formed. Antifungal drugs, which have an additional antioxidant effect, could contribute to a faster recovery. An important role in ensuring effective and safe pharmacotherapy of fungal lesions is played by proper drug storage and appro-priate patient actions during treatment. Ultraviolet radiation can generate free radicals in a drug due to photolysis. A drug containing free radicals may cause toxic effects in the body. The aim of the study was to research the antioxidant properties of selected antifungal drugs of azole derivatives. Addi-tionally, the impact of UVC radiation on the tested drugs and their interaction with the DPPH free radical was studied. MATERIAL AND METHODS: The tested azole samples were exposed to 24-hour UVC radiation. The interaction of drug samples with a model DPPH free radical, before and after exposure to UV radiation, was studied. UV-Vis spectroscopy and colourimetry in the CIE Lab colour analysis system were used as the research techniques. RESULTS: Among the initial samples of the tested drugs only ketoconazole interacted with the DPPH free radical, causing its extinction. Exposure to UVC radiation increased the antioxidant properties in ketoconazole and miconazole. The CIE Lab parameters, UV spectra and interaction kinetics of those two drugs with DPPH were different after UVC exposure, which may indicate changes in ketoconazole and miconazole. The highest stability to ultraviolet radiation was shown by fluconazole, whose CIE Lab parameters, UV spectra and interaction with DPPH did not change after exposure of the sample to light radiation. CONCLUSIONS: The research using UV-Vis spectrophotometry and colourimetry enabled the impact of UVC radiation on selected antifungal drugs to be evaluated, including evaluation of their interaction with the model DPPH free radical. It is recommended to protect ketoconazole and miconazole from exposure to light. It is also advisable to protect patients from the sun during pharmacotherapy with these drugs.
WSTĘP: Zmianom grzybiczym towarzyszy stan zapalny, w trakcie którego wytwarzane są duże ilości wolnych rodników. Leki działające przeciwgrzybiczo, wykazujące dodatkowo działanie antyoksydacyjne, mogłyby się przyczynić do szybszego powrotu do zdrowia. Ważną rolę w zapewnieniu skutecznej i bezpiecznej farmakoterapii zmian grzybiczych odgrywają prawidłowe przechowywanie leku oraz odpowiednie postępowanie pacjenta w trakcie leczenia. Promieniowanie ultrafioletowe może generować wolne rodniki w leku w procesie fotolizy. Lek zawierający wolne rodniki może powodować efekty toksyczne w organizmie. Celem pracy było zbadanie właściwości antyoksydacyjnych wybranych leków przeciwgrzybiczych pochodnych azoli. Dodatkowo sprawdzono wpływ promieniowania UVC (ultraviolet C) na badane leki oraz ich oddziaływanie z modelowym wolnym rodnikiem DPPH (2,2-Diphenyl-1-picrylhydrazyl). MATERIAŁ I METODY: Badane próbki azoli poddano 24-godzinnej ekspozycji na promieniowanie UVC. Zbadano oddziaływanie próbek leków z modelowym wolnym rodnikiem DPPH przed i po naświetlaniu ich promieniowaniem ultrafioletowym. Jako techniki badawcze zastosowano spektroskopię UV-Vis (ultraviolet-visible) oraz kolorymetrię w układzie analizy barwy CIE Lab. WYNIKI: Spośród wyjściowych próbek badanych leków tylko ketokonazol oddziaływał z wolnym rodnikiem DPPH, powodując jego wygaszenie. Ekspozycja na promieniowanie UVC powodowała wzrost właściwości antyoksydacyjnych w ketokonazolu oraz w mikonazolu. Parametry CIE Lab, widma UV oraz kinetyka oddziaływania z DPPH obu leków były odmienne po naświetlaniu promieniowaniem UVC, co może wskazywać na zmiany zachodzące w ketokonazolu i mikonazolu. Największą stabilność na promieniowanie ultrafioletowe wykazywał flukonazol, którego parametry CIE Lab, widma UV oraz oddziaływanie z DPPH nie zmieniły się po naświetlaniu próbki. WNIOSKI: Badania z zastosowaniem spektrofotometrii UV-Vis oraz kolorymetrii pozwoliły na ocenę wpływu promieniowania UVC na wybrane leki przeciwgrzybicze, w tym na ocenę ich oddziaływania z modelowym wolnym rodnikiem DPPH. Zaleca się ochronę ketokonazolu i mikonazolu przed światłem. Wskazana jest również ochrona przed słońcem pacjentów w trakcie farmakoterapii tymi lekami.
Źródło:
Annales Academiae Medicae Silesiensis; 2020, 74; 77-90
1734-025X
Pojawia się w:
Annales Academiae Medicae Silesiensis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nutritional and antioxidant profile of the Physalis fruit grown in three Andean regions of Peru
Autorzy:
Obregón-La Rosa, A.J.
Contreras-López, E.
Juárez, E.F.
Barrón, U.G.
Muñoz, A.M.
Ramos-Escudero, F.
Powiązania:
https://bibliotekanauki.pl/articles/28765541.pdf
Data publikacji:
2023
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Opis:
Background. Physalis peruviana L. fruit contains nutritional and bioactive compounds of immense importance to public health and represents a potential ingredient for the development of functional foods and beverages. Objective. This study aimed to determine the chemical and nutritional composition as well as the antioxidant capacity of the P. peruviana L. fruit grown in Peru in three areas of the Central Andean region. Material and methods. Proximal and physicochemical analyses and estimation of mineral content, vitamin C, total carotenoids, total polyphenols, and antioxidant capacity (2, 2-diphenyl-1-picrylhydrazyl [DPPH] and 2, 2′-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) [ABTS] assays) were performed using standardized methods. Results. The fruits were collected from three regions of the Peruvian Andes (Ancash, Cajamarca, and Cusco). The results showed that the content of potassium (306.54–327.60 mg/100 g) and iron (12.93–14.47 mg/kg) was prominent. The Physalis fruit had high levels of vitamin C (47.20–52.20 mg/100 g), total polyphenols (68.17–83.40 mg equivalents of gallic acid/100 g), and carotenoids (1.12–1.73 mg β-carotene/100 g). Higher values for antioxidant capacity were obtained with the ABTS method (896–1003.33 μmol Trolox/100 g) than with the DPPH method (290–309 μmol Trolox/100 g). Conclusions. This study confirms that the P. peruviana fruit has properties that could provide important health benefits and that it could be used for the development of functional foods and food supplement.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2023, 74, 1; 49-57
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-100 z 110

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