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Wyszukujesz frazę "alpha" wg kryterium: Temat


Tytuł:
Determination of Track Density of Animal Bones using CN-85 Detector
Autorzy:
Kadhim, Yasser Ayad
Kadhim, Nada Farhan
Najam, Laith Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/1076660.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CN-85 Detector
alpha emitters
alpha particles
bones
Opis:
The aim of the study is to calculate the alpha emitters in bone samples of some animals by counting the tracks of alpha particles emitted from radioactive nuclei (Pb-210, Po-210, Ra-226) using the CN-85 detector. The detectors were kept with the samples in closed clear plastic cups at a 2 cm distance for 60 days. The track density in the detector, and, hence, the alpha emitters from the bones were counted with an optical microscope after etching the detectors with an etchant solution (NaOH). The results showed that the optimum etching time of CN-85 when using to detect alpha emitted from natural radionuclides were 40 mins and the highest track density were found in chicken, beef, and sheep respectively.
Źródło:
World News of Natural Sciences; 2019, 26; 138-145
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pokolenie Alpha – nowy wymiar tożsamości?
Generation Alpha – a new dimension of identity?
Autorzy:
Gruchoła, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/565363.pdf
Data publikacji:
2016
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
Internet Rzeczy
pokolenie Alpha
tożsamość
Internet of Things
Generation Alpha
identity
Opis:
Życie w społeczeństwie nieodłącznie wiąże się z procesami identyfikacji, klasyfikacji i autoklasyfikacji, co w połączeniu z wielością dóbr stwarza niejednolite a niekiedy zaskakujące manifestacje tożsamości, sposobów i stylów życia. Jednym z nich może być „zanurzenie” w technologiach komunikacyjnych i informacyjnych oraz w Internecie Rzeczy. Wraz z całą zawartością treściową i medialną są one źródłem oraz narzędziami kształtowania tożsamości. Przedmiotem teoretycznych analiz było pytanie: czy i w jakim zakresie technologie medialne determinują życie człowieka i jego tożsamość? Szczegółowej analizie – w kontekście Internetu Rzeczy - zostało poddane pokolenie Alpha. Jego prezentacja została poprzedzona syntezą generacji Y i Z. Omówienie kolejnych generacji poprzedziły rozważania terminologiczne dotyczące terminu „tożsamość” oraz „pokolenie”. Przyjęto tezę, iż użytkownicy mediów nie są grupą jednorodną, inny jest też rodzaj ich pierwszego i kolejnych kontaktów z technologiami medialnymi, inna wrażliwość i kompetencje. Główne zależności koncentrują się na podziale pokoleniowym. Data urodzenia odbiorców/użytkowników mediów w zdecydowanym stopniu determinuje ich tożsamość oraz styl życia. W publikacji zastosowano metodę analityczno-opisową.
Living in society is inherently connected with the processes of identification, classification and self-classification. This combined with the multiplicity of goods creates patchy and sometimes surprising manifestations of identity and lifestyles. One of such manifestations may be “immersion” in information and communication technologies, which becomes a source and a tool of shaping identity. The article examines the question of whether and, to what extent, media technologies determine man’s life and his/her identity. Generation Alpha is analyzed in detail in the context of the Internet of Things. This analysis is preceded by a synthesis of Generation Y and Z, with Generation X deliberately omitted. The discussion of the features characterizing representatives of these generations is preceded by theoretical considerations on the following terms: identity, generation and the Internet of Things. It has been assumed that media users are not a homogeneous group; they differ in terms of their first and subsequent contacts with media technologies, their sensitivity and competence. These differences are mainly dependent on in the generation they represent. The identity and lifestyle of customers/media users are mostly determined by when they were born. An analytical and descriptive method is employed in the article.
Źródło:
Rozprawy Społeczne; 2016, 10, 3; 5-13
2081-6081
Pojawia się w:
Rozprawy Społeczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resting state EEG rhythm characteristics associated with readiness for divergent thinking
Cechy rytmu EEG w spoczynku związane z gotowością do myślenia rozbieżnego
Autorzy:
Kozachuk, N.
Kachynska, T.
Zhuravlyov, O.
Zhuravlyova, O.
Powiązania:
https://bibliotekanauki.pl/articles/2048046.pdf
Data publikacji:
2021
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
alpha rhythm
electroencephalogram
brain
Opis:
Background. Local synchronization of the electrical activity of the cerebral cortex at rest with eyes open in persons with different levels of divergent thinking were studied. Material and methods. 95 men and 98 women aged 18-21 with different levels of divergent thinking were studied. The power of the EEG at rest with eyes closed and open was analyzed. Results. There were established differences in the extent of the depression depth, as well as in the activation of the EEG alpha rhythm, which is related to gender and level of productivity. Women have a greater depth of alpha rhythm depression than men. In subjects with high and medium levels of divergent thinking, alpha-rhythm depression was of a generalized nature, and in subjects with low levels of divergent thinking – local and topographically non-specific. Conclusions. These results indicate that the EEG response of readiness to perceive stimuli, which provides either very high or very low productivity of divergent thinking, is manifested in the dynamics of the biopotential power in the EEG alpha range.
Źródło:
Health Problems of Civilization; 2021, 15, 3; 234-241
2353-6942
2354-0265
Pojawia się w:
Health Problems of Civilization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modes of \((\alpha)\)-convergence of sequences of functions
Autorzy:
Athanassiadou, E.
Boccuto, A.
Papanastassiou, N.
Powiązania:
https://bibliotekanauki.pl/articles/746661.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
sympathetic convergence, fine convergence, sympathetic-\(\alpha\)-convergence, fine-\(\alpha\)-convergence
Opis:
In this paper we deal with continuous convergence and some related properties of sequences of functions. We present some conditions to get uniform convergence of the sequence involved to a constant function. As an application, we give a result on equivalence between modes of convergence.
Źródło:
Commentationes Mathematicae; 2013, 53, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alpha spectrometry in radiochemical analysis and its application in the study of the natural environment
Autorzy:
Skwarzec, Bogdan
Boryło, Alicja
Strumińska-Parulska, Dagmara
Powiązania:
https://bibliotekanauki.pl/articles/764019.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
alpha spectrometry, polonium, uranium, plutonium
Opis:
Alpha spectrometry is a highly sensitive and modern measurement technique which can be used to radiochemical and radiological studies of the natural environment. In the paper were presented the results on application of alpha spectrometry in the study for determination of natural (210Po, 210Pb, 234U, 238U) and artificial (238Pu, 239+240Pu and 241Pu) alpha and beta radionuclides in environment of Poland and Baltic Sea. Amongst the radionuclides, alpha particle emitters play the most important role as they are highly radiotoxic to organisms. The concentrations of alpha radionuclides in the environmental samples of Poland are characterized based on the environmental materials collected between 1998 and 2009. Biogeochemistry of polonium, uranium and plutonium in the southern Baltic Sea ecosystem combined with the use of radioactive disequilibrium 210Po/210Pb, 234U/238U and 238Pu/239+240Pu and 241Pu/239+240Pu allows you to identify the sources of these radionuclides in natural ecosystems. It also allows to determine their circulation in the environment (e. g. to assess the impact of the Chernobyl nuclear accident on the radioactive contamination of Poland). 
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2016, 71, 1
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Periprocedural decrease in tumor necrosis factor alpha is a risk factor for atrial fibrillation recurrence after ablation
Autorzy:
Szczerba, Ewa
Koźluk, Edward
Januszkiewicz, Łukasz
Lisicka, Monika
Nowak, Justyna
Kondracka, Agnieszka
Majstrak, Joanna
Rodkiewicz, Dariusz
Piątkowska, Agnieszka
Kiliszek, Marek
Opolski, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/25712809.pdf
Data publikacji:
2022-12-05
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
atrial fibrillation
ablation
TNF-alpha
Opis:
Background Concentration of tumor necrosis factor alpha (TNF-alpha) might be useful in selecting patients with paroxysmal atrial fibrillation (PAF) who will benefit the most from pulmonary vein isolation. Material and methods We performed prospective cohort study among patients with PAF who had sinus rhythm prior to undergoing either radiofrequency ablation or cryoablation procedure. Blood samples were collected at the start of the procedure and 16-24 h after. TNF-alpha concentrations were measured. Follow-up data was obtained during a structured telephone interview and 24-hour ECG Holter monitoring 12 months after the ablation procedure. Results Thirty seven patients were enrolled. After 12-month follow-up 27 patients maintained sinus rhythm, 8 had recurrence of AF and 2 were lost to follow-up. There was no significant correlation between TNF-alpha concentrations in any of the samples and the recurrence of arrhythmia (for pre-procedural samples: 1.75 pg/ml vs 1.74 pg/ml; p=0.72; for post-procedural samples: 1.49 pg/ml vs 1.79 pg/ml; p=0.16). In patients who had a recurrence of AF, we observed a decrease in the periprocedural TNF-alpha concentration (-0.12 pg/ml vs 0.05 pg/ml; p=0.05). Conclusions Neither pre- nor post-procedural TNF-alpha concentrations are predictive of ablation outcome in patients with PAF. We observed a decrease in the periprocedural TNF-alpha concentration in patients who had AF recurrence.
Źródło:
European Journal of Translational and Clinical Medicine; 2022, 5, 2; 16-23
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of trehalase from muscles of Ascaris suum [Nematoda]
Autorzy:
Dmitryjuk, M.
Zoltowska, K.
Powiązania:
https://bibliotekanauki.pl/articles/836267.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
trehalose
parasite
muscle
alpha-trehalase glucohydrolase
enzyme
Nematoda
Ascaris suum
trehalase
alpha-trehalase
tissue
Źródło:
Annals of Parasitology; 1998, 44, 3
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza porównawcza zintegrowanych układów napędowych
Comparative Analysis of Integrated Propulsion Systems
Autorzy:
Giernalczyk, M.
Herdzik, J.
Powiązania:
https://bibliotekanauki.pl/articles/360670.pdf
Data publikacji:
2005
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
integrowany układ napędowy
OMiUO 2005
Propac
Alpha
Propac system
Alpha system
integrated propulsion packages
Opis:
W artykule przedstawiono porównanie zintegrowanych układów napędowych dwóch firm MAN B&W oraz Wärtsilä-Sulzer. Omówiono zalety i wady tych układów. Wskazano na problemy eksploatacyjne. Zamieszczono rysunki prezentowanych układów.
Two integrated propulsion systems manufactured by MAN B&W and Wärtsilä, respectively, are compared. The advantages and disadvantages of these systems are discussed. Some operational problems are indicated. The presented systems are illustrated.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2005, 5 (77); 237-246
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Re-discovery of Lieberkuehnia wageneri Claparède et Lachmann, 1859 (Rhizaria, Foraminifera): Taxonomical and Morphological Studies Based on a Slovak Population
Autorzy:
MRVA, Martin
Powiązania:
https://bibliotekanauki.pl/articles/763670.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Alpha taxonomy, Foraminifera, nomenclature, moss, amoebae
Opis:
Lieberkuehnia wageneri Claparède et Lachmann, 1859, a poorly known freshwater foraminiferan, was re-discovered after 38 years in a moss sample from an oak-hornbeam forest in Malé Karpaty Mts. (Western Slovakia). The species was taxonomically revised, re-described using light microscopical observations, and its occurrence and ecology were reviewed. Its locomotive form is typical with membranous and flexible ovoid test having a single terminal aperture from which a broad pseudopodial network emerges on a pseudopodial peduncle. Additional data and details are described, illustrated and discussed. Lieberkuehnia wageneri is known from various freshwater, soil and marine habitats in Western and Middle Europe, suggesting a high ecological tolerance and wide distribution. It is hoped that the observations reported in this paper will aid the identification of this species based on the locomotive morphology at the light microscopical level.
Źródło:
Acta Protozoologica; 2009, 48, 2
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Muzyczna reprezentacja kosmogonicznej kategorii jedności w kantacie Alpha…. Konstantego Regameya
Autorzy:
Leszczyńska, Julia
Powiązania:
https://bibliotekanauki.pl/articles/2144035.pdf
Data publikacji:
2020
Wydawca:
Akademia Muzyczna im. Stanisława Moniuszki w Gdańsku
Tematy:
reprezentacja
kosmogonia
jedność
Alpha
Regamey Konstanty
Opis:
Kantata na tenor i orkiestrę symfoniczną Alpha… (1970) Konstantego Regameya jest niezwykłym dziełem muzycznym, które łączy muzyczne tradycje muzyki europejskiej z duchowością starożytnych Indii. Tekst wedyjskiego hymnu, wiedza i doświadczenie kompozytora-orientalisty oraz jego poetyka muzyczna niosą ze sobą liczne konteksty interpretacji. Artykuł stanowi próbę odczytania sensu muzycznego dzieła w świetle kosmogonicznej treści hymnu 129. Rigwedy, ze szczególnym uwzględnieniem reprezentacji kategorii jedności. Jej podstawą było odniesienie do poglądów estetycznych kompozytora oraz specyficznych cech twórczości, przede wszystkim polistylizmu. Szczególnie ważnym aspektem zdaje się fakt, że kompozytor, będący jednocześnie indologiem, sam dokonał tłumaczenia starohinduskiego tekstu dla potrzeb swojej kompozycji. Ładunek ekspresywny i energetyczny pełnego metafor i symboli tekstu został muzycznie przez niego zobrazowany w sposób wyrazisty i czytelny, a idee zawarte w tekście słownym, w tym transcendentalna jedność i jej reprezentacje spajają muzyczną całość, pomimo różnorodności stylów i technik stosowanych przez Regameya.
Źródło:
Aspekty Muzyki; 2020, 10; 201-226
2082-6044
Pojawia się w:
Aspekty Muzyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of salivary alpha amylase activity in smokers with periodontitis, Khartoum state, 2023
Autorzy:
Abd Alwhab Awad Allah, Fatima
Elrheima Ahmed, Hafsa Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/29519597.pdf
Data publikacji:
2023-12-31
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
alpha-amylase
periodontitis
saliva
smokers
Opis:
Introduction and aim. Smoking widely affect oral health, including its role in the development of periodontitis. Saliva contains an antioxidant system and various enzymes. The study was designed to evaluate the activity of salivary alpha amylase among individuals who smoke and have periodontitis. Material and methods. A total of 100 participants were included, with 50 cases (cigarette smokers with periodontitis) and the remaining 50 nonsmokers with healthy periodontium as the control group. Saliva samples were collected to measure salivary alpha amylase activity. Results. Smokers with periodontitis had significantly higher levels of salivary alpha amylase compared to the control group(177.96±14.5 vs 94.04±19.6 IU/mL, p<0.001). Additionally, there was a weak negative correlation between the level of alpha amylase and the age of the patients (p=0.01, r=0.376). However, no correlation was found between the level of alpha amylase and the duration of smoking (p=0.584, r=0.079). Conclusion. There is a significant increase in salivary alpha amylase levels among smokers with periodontitis. No correlation was found between age and salivary alpha amylase levels. However, a weak positive correlation was observed between the duration of smoking and salivary alpha amylase activity.
Źródło:
European Journal of Clinical and Experimental Medicine; 2023, 4; 692-695
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strongly gamma-starlike functions of order alpha
Autorzy:
Nunokawa, Mamoru
Sokół, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/747069.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Strongly starlike functions of order alpha
convex functions of order alpha
strongly starlike functions of order alpha
gamma-starlike functions
Nunokawa's Lemma.
Opis:
In this work we consider the class of analytic functions \(\mathcal{G}(\alpha,\gamma)\), which is a subset of gamma-starlike functions introduced by Lewandowski, Miller and Złotkiewicz in Gamma starlike functions, Ann. Univ. Mariae Curie-Skłodowska, Sect. A 28 (1974), 53–58. We discuss the order of strongly starlikeness and the order of strongly convexity in this subclass.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica; 2013, 67, 2
0365-1029
2083-7402
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification and genetics of betaglobulin [BgC1] and alphaglobulin [AmiF1] antigenic markers in cattle
Autorzy:
Wegrzyn, J
Skiba, E
Wegrzyn, Z
Powiązania:
https://bibliotekanauki.pl/articles/2047266.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
genetics
alpha-globulin
serum
cattle
antigenic determinant
protein
beta-globulin
genetic marker
alpha-microglobulin
Opis:
Alloantibodies detecting antigenic determinants called BgC1 and AmiF1 were obtained in cattle. The analysis of determinants' inheritance was done on 1754 offsprings after 72 sires and 1740 dams. The molecule-carriers of both traits were characterized using serological and physico-chemical methods. It was found that the identified determinants are markers of beta-globulin and alpha-microglobulin proteins, and of autosomal, dominant genes BgC1 and AmiF1 from independent loci, which control them.
Źródło:
Journal of Applied Genetics; 1996, 37, 3; 285-292
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved magnitude estimation of complex numbers using alpha max and beta min algorithm
Ulepszony algorytm aproksymacji modułu liczby zespolonej z wykorzystaniem metody alpha max beta min
Autorzy:
Smyk, R.
Czyżak, M.
Powiązania:
https://bibliotekanauki.pl/articles/267282.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
alpha max beta min algorithm
complex number
magnitude
algorytm alpha max beta min
aproksymacja modułu liczby zespolonej
Opis:
The paper presents an improved algorithm for calculating the magnitude of complex numbers. This problem, which is a special case of square rooting, occurs for example, in FFT processors and complex FIR filters. The proposed method of magnitude calculation makes use of the modified alpha max and beta min algorithm. The improved version of the algorithm allows to control the maximum magnitude approximation error by using an adequate number of approximation regions. In this way it is possible to reduce the maximum error to 3.95% for one region, and 0.24% and 0.06% for four and eight regions, respectively. This algorithm in its basic form requires only two multiplications by a constant and one addition which are preceded by the choice of greater of two arguments with respect to their absolute values. The improved version requires one general division to determine the proper approximation region. The algorithm implementation issues are considered in the accompanying paper.
W artykule przedstawiono ulepszony algorytm aproksymacji modułu liczby zespolonej. Wyznaczanie modułu liczby zespolonej wymagane jest przykładowo przy realizacji FFT i filtracji cyfrowej sygnałów zespolonych. Jest to specjalny przypadek obliczania pierwisatka kwadratowego. Wersja ulepszona algorytmu umożliwia pełną kontrolę maksymalnego błędu wyznaczania modułu liczby zespolonej. Możliwe jest to dzięki wyprowadzeniu ogólnej postaci algorytmu dla dowolnej liczby regionów aproksymacji. Umożliwia to redukcję wspomnianego błędu aproksymacji z 3,95% dla jednego regionu, do przykładowo 0,24% dla czterech regionów i 0,06% dla ośmiu regionów aproksymacji. Proponowana metoda bazuje na zmodyfikowanej wersji algorytmu alpha max beta min. Algorytm ten wymaga najpierw porównania wartości bezwzględnych części rzeczywistej i części urojonej liczby zespolonej w celu wyznaczenia większej z nich. Następnie algorytm w wersji podstawowej z jednym regionem aproksymacji konieczne jest wykonanie tylko dwóch mnożeń przez stałą oraz jednego sumowania. W wersji ulepszonej wykonywane jest dodatkowe dzielenie celem wyznaczenia odpowiedniego regionu aproksymacji. Zastosowano tu beziteracyjny algorytm dzielenia. Szczegółowe zagadnienia związane z implementacją układową ulepszonej wersji algorytmu zostały przedstawione w artykule towarzyszącym.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2016, 51; 167-171
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reclamation of spend moulding sands with the Carbophen 8178 resin
Regeneracja masy zużytej z żywicą Carbophen 8178
Autorzy:
Kamińska, J.
Kmita, A.
Kolczyk, J.
Żymankowska-Kumon, S.
Powiązania:
https://bibliotekanauki.pl/articles/264190.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
masa formierska
technologia alpha-set
regeneracja mechaniczna
bentonite moulding sand
alpha-set technology
mechanical reclamation
Opis:
The aim of investigations was to collect the experimental data allowing the quality assessment of the reclaimed material obtained by means of the mechanical reclamation from spent sands with the Carbophen 8178 resin. The investigation program was as follows: - making the moulding sand with the Carbophen 8178 resin and its preparation for the primary reclamation; - carrying out the secondary reclamation of the spent sand in the experimental mechanical reclaimer, at several variable parameters (inclination, reclamation time, rotor rotational speed); - necessary instrumental tests of the reclaimed spent sand and the analysis of the obtained reclaimed materials Investigations were carried our for three positions of the apparatus: a = 0°, 3°, 6°. The reclamation was performed for each position at three rotational speeds of impact-abrasive elements. The reclamation process effects were checked after 5, 10, 15 and 20 minutes. The reclamation results for the average rotational speed of the rotor, being 700 rpm, are presented in the paper
Celem badań było zgromadzenie danych doświadczalnych pozwalających na oceną jakości re-generatu uzyskanego z masy zużytej z żywicą Carbophen 8178 sposobem regeneracji mechanicznej. Program badań własnych obejmował: - wykonanie masy z żywicą Carbophen 8178 i jej przygotowanie do regeneracji (regeneracja wstępna); - regenerację właściwą masy zużytej w doświadczalnym regeneratorze mechanicznym, przy szeregu zmiennych parametrów (nachylenie, czas regeneracji, prędkość obrotowa wirnika); - niezbędne badania instrumentalne regenerowanej masy zużytej oraz analiza uzyskanych regeneratów, Badania były przeprowadzone przy trzech położeniach aparatu: a = 0°, 3°, 6°. W każdym z zadanych położeń została przeprowadzona regeneracja masy przy trzech prędkościach obrotowych elementów udarowo-ściernych. Efekty procesu regeneracji badano po 5, 10, 15 i 20 minutach. W artykule zostały przedstawione wyniki regeneracji przy średniej prędkości obrotowej wirnika wynoszącej 700 obr/min.
Źródło:
Metallurgy and Foundry Engineering; 2012, 38, 2; 163-170
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Validation of the method for determination of plutonium isotopes in urine samples and its application in a nuclear facility at Otwock
Autorzy:
Rzemek, K.
Czerwiński, A.
Dymecka, M.
Ośko, J.
Pliszczyński, T.
Haratym, Z.
Powiązania:
https://bibliotekanauki.pl/articles/147900.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
alpha radioactive elements
internal contamination
plutonium
urine
Opis:
The studies aimed at determining low activities of alpha radioactive elements are widely recognized as essential for the human health, because of their high radiotoxicity in case of internal contamination. Some groups of workers of nuclear facility at Otwock are potentially exposed to contamination with plutonium isotopes. For this reason, the method for determination of plutonium isotopes has been introduced and validated in Radiation Protection Measurements Laboratory (LPD) of the National Centre for Nuclear Research (NCBJ). In this method the plutonium is isolated from a sample by coprecipitation with phosphates and separated on a AG 1-X2 Resin. After electrodeposition, the sample is measured by alpha spectrometry. Validation was performed in order to assess parameters such as: selectivity, accuracy (trueness and precision) and linearity of the method. The results of plutonium determination in urine samples of persons potentially exposed to internal contamination are presented in this work.
Źródło:
Nukleonika; 2015, 60, 1; 181-186
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pathophysiological roles of ERα in the ER signaling mediated oncogenesis of breast cancer
Autorzy:
Abda Neja, Sultan
Powiązania:
https://bibliotekanauki.pl/articles/2040136.pdf
Data publikacji:
2020-12-30
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
breast, cancer
estrogen receptor alpha
oncogenesis
Opis:
Introduction. Estrogen receptors (ER) are members of nuclear receptors that act in the ER signaling pathway regulating the pathophysiology of hormone-responsive target cells including breast tissue. Aim. This detailled review literature was written on the pathophysiology of ER signaling as well as the effect altered ERα and associated pathway derangement in the oncogenesis of breast cancer. Material and methods. This review was performed according to systematic literature search of three major bibliographic databases (Scopus, PubMed, and Cochran). Analysis of the literature. In this pathway, estrogen receptor alpha (ERα) is a key estradiol-17β (E2) induced transcription factor that has been implicated in the initiation and development of the major fraction of breast cancers. Hence understanding the ERα-mediated ER signaling that results in alterations from normal phenotypic features of breast tissue to the oncogenic features of breast cancer is important. The oncogenic effect of ERα in ER signaling is driven by combinations of molecular assets within the cancer cells. Normally, the transcriptional activity of ERα is controlled by tight regulation of its protein level inside the cells. Altered stability and activity of ERα due to its phosphorylation, ubiquitination, glycosylation, sumoylation, and acetylation events can trigger oncogenic ER signaling. Conclusion. The function and activity of ERα is also modulated by its interaction with coregulators as well as crosstalk with oncogenic factors from other oncogenic pathways. These all events increase the complexity of the progression of ER+ breast cancer and its response to endocrine therapy
Źródło:
European Journal of Clinical and Experimental Medicine; 2020, 4; 289-302
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on analytical procedure of plutonium separation from air aerosols collected on Petrianov filter
Autorzy:
Komosa, A.
Chibowski, S.
Orzeł, J.
Powiązania:
https://bibliotekanauki.pl/articles/148072.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
alpha spectrometry
Petrianov filter
plutonium
polonium
Opis:
A standard procedure for the determination of plutonium in soil was modified and applied for the assay of this element in dust and aerosols collected from ground-level air on a Petrianov filter, in an ASS-500 air monitoring station. The modification consists in replacing a dry ashing mineralization step by direct acid leaching. The problem of polonium interference with plutonium determination was also discussed and the concentration of polonium in air was estimated.
Źródło:
Nukleonika; 2001, 46, 4; 151-153
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DIPSACUS FULLONUM L. LEAVES AND ROOTS - IDENTIFICATION OF THE COMPONENTS OF THE ESSENTIAL OILS AND ALPHA-AMYLASE INHIBITORY ACTIVITIES OF METHANOLIC EXTRACTS
Autorzy:
Witkowska-Banaszczak, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/895320.pdf
Data publikacji:
2018-08-31
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
essential oil composition
methanolic extract
alpha-amylase inhibition
Opis:
Abstract: Dipsacus fullonum L. syn. D. sylvestris is a biennial plant from the Dipsacaceae family. It grows in Europe, North Africa and Asia Minor. It has been used in folk medicine mainly to treat Lyme disease. This study was undertaken to identify and compare the components of the essential oils from dried and fresh roots, which are usually applied as medicinal agents, as well as those of the essential oils from dried and fresh leaves, used less frequently. The essential oils from the Dipsacus fullonum leaves and roots were analysed by the GC and GC-MS analysis. 18 components were identified in the essential oil from the fresh leaves, whereas 37 were recognised in the oil from the dried leaves; 10 components were identified in the essential oil from the fresh roots and 40 in that from the dried roots. Phytol was the main component in the essential oil from the leaves, whereas n-hexadecanoic acid was predominant in the roots. The α -amylase inhibition has been proven for methanolic extracts of D. fullonum leaves and roots. The strongest activity was demonstrated by the extract from fresh leaves of D. fullonum and showed an effect about one hundred times weaker than acarbose.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 4; 951-957
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of crystals based on cesium iodide for measurements of gamma radiation and alpha particles
Autorzy:
Pereira, M. C. C.
Filho, T. M.
Hamada, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/148098.pdf
Data publikacji:
2009
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
scintillator
crystals
gamma radiation
alpha particles
luminescence
Opis:
During the past 50 years, scintillators have been among the most important nuclear radiation detectors. Inorganic scintillators are widely used in experimental nuclear physics, high energy physics, nuclear medicine, nuclear tomography, environmental studies and many other fields of use. Scintillation crystals based on cesium iodide (CsI) are matters of relatively low hygroscopy, high atomic number, easy handling and low cost, characteristics that favor their use as radiation detectors. In this work, the growth of pure CsI crystals, CsI:Br and CsI:Pb, using the Bridgman technique, is described. Ions of divalent lead (Pb2+) doped in the crystal structures are efficient emission centers and their application as scintillators is still the reason for intensive studies. Recently, promising results have been found for crystals of CsI doped by bromine (Br) for their use as radiation detectors. The concentration of the bromine doping element (Br) was studied in the range from 1.5 × 10–1 M to 10–2 M and the lead (Pb) in the range from 10–2 M to 5 × 10–4 M. To evaluate the scintillators developed, systematic measurements were carried out for luminescence emission and luminescence decay time for gamma radiation, Vickers microhardness assays, and analysis of crystals response to the gamma radiation, in the energy range from 350 keV to 1330 keV, and alpha particles from a 241Am source, with energy of 5.54 MeV. The obtained values for luminescence decay time for CsI:Br and CsI:Pb crystals, were from 13 to 19 ns.
Źródło:
Nukleonika; 2009, 54, 3; 151-155
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tutorial on operating characteristics of microprocessor-based multiterminal line current differential relays
Autorzy:
Kasztenny, B
Benmouyal, G
Altuve, H J
Fischer, N
Powiązania:
https://bibliotekanauki.pl/articles/410604.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
protective relaying
differential protection
Alpha Plane principle
Opis:
Line current differential (87L) protection schemes face extra challenges compared with other forms of differential protection, in addition to the traditional requirements of sensitivity, speed, and immunity to current transformer saturation. Some of these challenges include data communication, alignment, and security; line charging current; and limited communications bandwidth. To address these challenges, microprocessor-based 87L relays apply elaborate operating characteristics, which are often different than a traditional percentage differential characteristic used for bus or transformer protection. These sophisticated elements may include adaptive restraining terms, apply an Alpha Plane, use external fault detection logic for extra security, and so on. While these operating characteristics provide for better performance, they create the following challenges for users: x Understanding how the 87L elements make the trip decision. x Understanding the impact of 87L settings on sensitivity and security, as well as grasping the relationship between the traditional percentage differential characteristic and the various 87L operating characteristics. x Having the ability to transfer settings between different 87L operating characteristics while keeping a similar balance between security and dependability. x Testing the 87L operating characteristics. These issues become particularly significant in applications involving more than two currents in the line protection zone (multiterminal lines) and lines terminated on dual-breaker buses. This paper is a tutorial on this relatively new protection topic and offers answers to the outlined challenges.
Źródło:
Present Problems of Power System Control; 2013, 3; s. 5-73
2084-2201
Pojawia się w:
Present Problems of Power System Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of post-harvest maturation on the amylolytic activity of wheat grain and the properties of bread
Autorzy:
Szafrańska, Anna
Stępniewska, Sylwia
Powiązania:
https://bibliotekanauki.pl/articles/2148191.pdf
Data publikacji:
2021-12-30
Wydawca:
Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy
Tematy:
alpha-amylase
bread
mixolab
technological value
wheat
Opis:
The aim of this study was to determine the quantitative and qualitative changes in the starch complex and the amylolytic activity of wheat grain during its post-harvest maturity. This in- formation is necessary for the proper determination of the level of quality requirements for wheat grain purchased immediately after harvest. The common wheat cultivars: Kandela, Bamberka and KWS Ozon were tested during this study. Because of the variability of weather conditions, three wheat cultivars were tested (two winter wheat cultivars and one spring wheat cultivar) from two consecu- tive crop years. Immediately after grain harvest and during the next 12 weeks in two-weeks intervals the falling number, amylo- graph properties, rheological properties of dough and laboratory baking test was performed. Tested wheat cultivars were characterized by low amylolytic activity. Changes of the baking value of tested wheat cultivars during their post-harvest maturation were dependent on wheat cultivar and harvest year. Wheat from the 2016 harvest was char- acterized by significantly lower amylolytic activity compared to grain from 2015 harvest. Amylolytic activity decreased during post-harvest maturation, i.e. the falling number increased as well as the dough torque in point C4 and C5 of mixolab curve. There was also an increase in the volume of bread compared to the evaluation of the samples tested immediately after harvest. The highest values were obtained in the 4th week after harvest. The changes were dependent on wheat cultivar. However, in the case of the assessment of the rheological characteristics of the dough (except point C4) they were not statistically significant.
Źródło:
Polish Journal of Agronomy; 2021, 47; 58-67
2081-2787
Pojawia się w:
Polish Journal of Agronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Protestant Church Strategy in Building Spiritual Identity for Generation Alpha
Autorzy:
Gultom, Joni Manumpak Parulian
Powiązania:
https://bibliotekanauki.pl/articles/50127488.pdf
Data publikacji:
2023
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II
Tematy:
Generation Alpha
Church
Christian
healing
social media
Opis:
This research aims to explain Protestant Church strategy in building Christian identity for Generation Alpha (Gen Alpha) amidst the adverse effects of globalization. Currently, the generation is navigating the complex terrain of a postmodern era characterized by the pervasive dissemination of concepts such as skepticism, subjectivism, and relativism. Gen Alpha has experienced a profound shift in cultural values, with a marked transition from religiosity to secularity. Consequently, Church must direct its attention towards the ideological and spiritual well-being of the generation. The influence of distortionary forces on the perception of reality is a matter of concern, stemming from various sources such as peers in the community, the educational system, social media, and the vast expanse of the Internet. The result show that Gen Alpha has been raised in the context of post-Christian and post-Church cultural environments. In this research, a qualitative research approach is used, predominantly through an extensive review of pertinent literature. The examination commences with an in-depth exploration of Gen Alpha and the formation of spiritual identity. Subsequently, the strategic initiatives conducted by Protestant Church are examined and the initiatives include worship services, fatherly mentorship, and cultivating a strong Christian identity. The conclusion shows the collaborative efforts of Church with the pastoral team, in the construction of its ministry. This is characterized by the implementation of transpersonal actions, the guiding of healing initiatives for the needs of families, and the cultivation of personalized spiritual practices. An important component of the comprehensive strategy includes the training and education of fathers to assume a central role in building the spiritual development of children. Furthermore, Church values the spiritual building of children aged between 4 and 14 years to fortify Christian identity.
Źródło:
Verbum Vitae; 2023, 41, 4; 1027-1046
1644-8561
2451-280X
Pojawia się w:
Verbum Vitae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of magnitude calculation of complex numbers using improved alpha max plus beta min algorithm
Implementacja sprzętowa obliczania modułu liczby zespolonej z wykorzystaniem ulepszonego algorytmu alpha max plus beta min
Autorzy:
Smyk, R.
Czyżak, M.
Powiązania:
https://bibliotekanauki.pl/articles/268550.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
alpha max plus beta min algorithm
complex numbers
magnitude
FPGA
algorytm alpha max beta min
moduł liczby zespolonej
Opis:
The paper presents the hardware implementation of the improved alpha max plus beta min algorithm for calculating the magnitude of complex numbers. This version of the algorithm requires the general division which is performed using a noniterative multiplicative division algorithm. We analyze in detail the division algorithm, its error and the impact of finite word-length signal representations on the assumed total computation error. An analysis is performed to determine the binary length of operands at each stage of the magnitude calculator in order not to exceed the assumed total error. An FPGA implementation is presented along with its hardware requirement and delay.
W artykule przedstawiono układową implementację ulepszonego algorytmu wyznaczania modułu liczby zespolonej. Wersja ta wymaga realizacji dzielenia sprzętowego. Zaproponowano wykorzystanie własnej nieiteracyjnej metody dzielenia. Wykonano szczegółową analizę algorytmu dzielenia pod kątem wyznaczenia wpływu skończonej długości reprezentacji binarnych sygnału wejściowego i sygnałów wewnętrznych układu na całkowity błąd dzielenia. Oszacowano również błąd całkowity obliczania modułu liczby zespolonej wynikający z wykorzystania nieiteracyjnej metody dzielenia. Ostatecznie wyprowadzono zależności pozwalające na dobór długości binarnej reprezentacji współczynników algorytmu dzielenia, przy której nie zostanie przekroczony maksymalny błąd obliczania modułu wynikający z właściwości numerycznych. Finalnie przedstawiono realizację rozwiązania układowego dedykowanego dla FPGA wraz z wynikiem syntezy w środowisku Xilinx.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2016, 51; 173-179
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multifractal Nature of Diesel Engine Rattle Noise in Vehicle
Autorzy:
Puchalski, A.
Komorska, I.
Powiązania:
https://bibliotekanauki.pl/articles/176736.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical noise
mechanical vibration
multifractal formalism
alpha-stable distributions
Opis:
The investigation results of the emission of noises accompanying the diesel engine powertrain running in unloaded condition at low or idle speed, are presented in the hereby paper. The multifractal nature of the tested signals was confirmed by means of two groups of parameters. The proposed local parameters are based on the distribution of the probability density of measures, segregated into subsets according to pointwise Holder exponents. The obtained spectra constitute a set of multifractal measures related to singularities representing the local scaling of measures in various points of the time series. Global parameters were defined on the basis of multifractal measures of the parametrised Renyi’s entropy. These are properties treating summarily the whole spectrum of the emitted noise and reflecting changes of the vibroacoustic energy levels generated by noise sources. The tests encompassing simultaneous application of both groups of parameters confirmed their efficiency in the comparative analysis as well as in the subjective assessment of the noise level generated in the drive system of vehicles with diesel engines. This opens new possibilities within the simulation range of vehicle noises, for the needs of constructing the passive and active reduction systems of the effects of the vibroacoustic energy propagation.
Źródło:
Archives of Acoustics; 2017, 42, 3; 469-474
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The activity of cathepsin D and alpha-1 antitrypsin in hip and knee osteoarthritis
Autorzy:
Olszewska-Slonina, Dorota
Matewski, Dariusz
Jung, Stanislaw
Olszewski, Krzysztof
Czajkowski, Rafal
Braszkiewicz, Joanna
Wozniak, Alina
Kowaliszyn, Bogna
Powiązania:
https://bibliotekanauki.pl/articles/1039618.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
protease
cathepsin D
alpha 1-antitrypsin
antiprotease
cartilage
osteoarthritis
Opis:
The progress of cartilage decay during joint degeneration is not well monitored with biochemical methods. The role of cathepsin D (CAT-D) in articular cartilage deterioration remains unclear. The aim of this study is to assess the activity of CAT-D and alpha-1 antitrypsin (AAT) in blood in patients with hip or knee osteoarthritis. The activity of CAT-D and AAT in blood serum of 40 women and 21 men with hip or knee osteoarthritis was determined before total joint replacement, on the tenth day after surgery, and once in 54 healthy patients. The preoperative activity of CAT-D in patients with osteoarthritis was lower by 53.6% (11.00 ± 4.54 10-2 nM released tyrosine/mg protein/min, P < 0.001) and after surgery by 55.0% (10.67 ± 4.64 10-2 nM released tyrosine/mg protein/min, P < 0.001) when compared to its activity in healthy patients. There was no significant statistical difference between CAT-D activity before the surgery and its activity on the tenth day after it in the analyzed group (P< 0.496). Simultaneously, the preoperative activity of AAT in the OA (osteoarthritis) patients was by 25.5% (0.93 ± 0.32 mg inhibited trypsin/ml blood serum, P < 0.001) and postoperative was by 44.9% higher (1.26 ± 0.36 mg inhibited trypsin/ml blood serum, P < 0.001) than in healthy patients. The low CAT-D activity in osteoarthritis of big joints is associated with a decrease of cartilage cells during the degenerative process. The higher activity of acute phase protein AAT in OA patients' blood serum confirms the inflammatory component in the osteoarthritis process.
Źródło:
Acta Biochimica Polonica; 2013, 60, 1; 99-106
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some properties of the class \(\mathcal{U}\)
Autorzy:
Obradovic, Milutin
Tuneski, Nikola
Powiązania:
https://bibliotekanauki.pl/articles/1395941.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Analytic
class \(\mathcal{U}\)
starlike, \(\alpha\)-convex
Hankel determinant
Opis:
In this paper we study the class \(\mathcal{U}\) of functions that are analytic in the open unit disk \(D =\{z : |z| < 1\}\), normalized such that\(f(0) = f'(0)-1 = 0\) and satisfy \[\left|\left[\frac{z}{f(z)}\right]^2f'(z) - 1\right|< 1\quad  (z\in D).\]For functions in the class \(\mathcal{U}\) we give sharp estimates of the second and the third Hankel determinant, its relationship with the class of \(\alpha\)-convex functions, as well as certain starlike properties.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica; 2019, 73, 1
0365-1029
2083-7402
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbon-13 in alpha-cellulose of oak latewood (Jędrzejów, Southern Poland) during the Maunder Minimum
Autorzy:
Pazdur, A.
Korput, S.
Fogtman, M.
Szczepanek, M.
Hałas, S.
Krąpiec, M.
Szychowska-Krąpiec, E.
Powiązania:
https://bibliotekanauki.pl/articles/2058897.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
13C isotope
alpha-cellulose
Maunder Minimum
tree-rings
Opis:
We have studied the δ13C signature in latewood alpha-cellulose of an ancient oak (Quercus robur L.) from a Cisterian Abbey belfry in Jędrzejów (Southern Poland). The time scale for the delta 13C record during 1631-1765 AD was built on the basis of detailed dendrochronology studies. Techniques available for extraction of alpha-cellulose from small samples have been used, the mean value of alpha-cellulose extraction efficiency being ca. 35%. In the delta 13C record of alpha-cellulose the cooling between 1650-1700 AD is clearly visible as a decrease of about 1.5‰. This period is consistent with the interval of the lowest solaractivity between 1645 and 1715 AD, which is known as the Maunder Minimum. Anti-correlation between δ13C and δ13C during the Maunder Minimum was observed but δ13C record is delayed by about 30 years with respect to the Maunder Minimum.
Źródło:
Geological Quarterly; 2005, 49, 2; 165-172
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of the hop bitter acids during long-term storage of cones with different maturity degree
Autorzy:
Skomra, Urszula
Koziara-Ciupa, Marta
Powiązania:
https://bibliotekanauki.pl/articles/2148476.pdf
Data publikacji:
2020-03-31
Wydawca:
Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy
Tematy:
hop
alpha acids
beta acids
storage temperature
cones maturity
Opis:
The aim of the study was to assess the dynamicsof changes in the content of hop bitter acids during long-termstorage of cones that vary in maturity degree under differenttemperature conditions. The impact of the degree of maturityof hop cones on the stability of bitter acids during storage islittle known so far, and it is important, because due to the systematicincrease of the hop growing area on individual farms, thecone harvesting period is extended beyond the optimal phase oftechnological maturity. Hop cultivars belonging to two groupswere included in the study: bitter (Magnat, Magnum) and aroma(Puławski, Sybilla). Cones were collected on a few dates duringvegetation season, starting from the phase in which they reachedmaximum size until the beginning of physiological maturity.The dried cones were stored at +5 °C and +20 °C for 12 monthsand tested every three months for alpha and beta acid contentusing HPLC. Studies have shown that too early a hop harvestadversely affected bitter acid content. Storage temperature hadsignificant impact on the degradation of alpha and beta acids. Ata higher temperature the decrease in the content of these compoundswas greater. The tested hop cultivars were characterized bydifferent stability of bitter acids. The highest stability of alphaacids was observed for Sybilla, while the lowest for Magnat.The stability of alpha and beta acids during long-term storageof the raw material, especially at + 20oC, depended on the degreeof cones maturity. The aging rate of hop cones was not thesame throughout the storage period. For the first 3–6 months ata temperature of +5oC, the bitter acid content remained at a levelsimilar to the initial one, later a relatively rapid decrease in thecontent of these metabolites occurred. At higher temperatures,the bitter acid stabilization period was shorter.
Źródło:
Polish Journal of Agronomy; 2020, 40; 16-24
2081-2787
Pojawia się w:
Polish Journal of Agronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of weighted myriad filters to suppress impulsive noise in biomedical signals
Autorzy:
Pander, T.
Powiązania:
https://bibliotekanauki.pl/articles/1965811.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
weighted myriad filter
alpha-stable distribution
biomedical signals
Opis:
Biomedical signals are commonly recorded with many kinds of noise. One of these is a waveform of the electrical activity of muscles. This "natural" distortion is usually modelled with a white Gaussian noise. In order to suppress such noise a weighted myriad filter is applied. The weighted myriad filter belongs to a class of non-linear filters and requires knowledge about noise impulsiveness. An impulsive noise can be described with alpha-stable distributions. One objective of this paper is to apply alpha-stable distribution as a model of real-life muscle noise in ECG signals. The other objective of the paper is to apply a weighted myriad filter to suppress impulsive noise in biomedical (ECG) signals. The reference filters have been the Savitzky-Golay smoothing filter and the median filter. The obtained results have shown that alpha-stable distributions can be applied to model muscle noise and that a weighted myriad filter with a Chebyshev weighted function can effectively suppress such noise.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 2; 199-216
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Incrustation of alpha-particle emitters in the source backing: influence on activity measurements
Autorzy:
Jurado-Vargas, M.
Fernández-Timón, A.
Powiązania:
https://bibliotekanauki.pl/articles/146904.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
alpha-particle spectrometry
Monte Carlo (MC) simulation
SRIM
Opis:
Alpha particles emitted from radioactive sources are often measured using a 2pi counting geometry in order to determine the activity with a low deviation. The ratio C2pi/A (counting rate/activity) can, however, deviate from the theoretical value of 0.5 because of backscattering in the backing material, scattering and absorption of alpha particles in the source. The experimental counting rates are, therefore, corrected for these effects (backscattering for all sources, plus self-absorption for sources of non-negligible thickness) to determine the real source activity. However, the corrections needed for situations corresponding to alpha-particle sources in which the radionuclides are not deposited but incrusted in the backing material have not been considered. The aim of the present work was therefore to study the influence that incrustation in the backing can have on the total detection efficiency, and hence on the activity estimated for the source. To this end, we used the Monte Carlo computer code SRIM to model the behaviour of the alpha particles in the backing material.
Źródło:
Nukleonika; 2012, 57, 4; 569-573
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of risks and investments’ opportunities in water sector
Autorzy:
Zeneli, Fjona
Powiązania:
https://bibliotekanauki.pl/articles/1036616.pdf
Data publikacji:
2016
Wydawca:
Academicus. International Scientific Journal publishing house
Tematy:
opportunities
investment portfolio
water sector
beta
alpha
allocation
Opis:
While water demand is projected to grow by 41% by 2030, considering also the ultimate reserves of drinking water, it is believed that this element will attract the majority of investments in the coming decades. Opportunities in drinking water sector are numerous, because its process of providing and delivery of drinking water includes many aspects: management of infrastructure, design of technological solutions, conservation and water’s quality. These opportunities result from the difference between water supply and water demand; an increasingly difference that requires capital investments in production and water treatment technologies. Investments need to be combined with the knowledge on the legislation, regulatory framework and technological developments. This article may serve to clarify type of investments in drinking water sector, known by literature, to identify opportunities of investment in this sector, indicating the theoretical framework of beta and alpha risk ratio coefficient calculation and to suggest how these types of investments can be allocated to the investment portfolios.
Źródło:
Academicus International Scientific Journal; 2016, 13; 128-137
2079-3715
2309-1088
Pojawia się w:
Academicus International Scientific Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on the performance comparison of three optimal Alpha-Beta-Gamma filters and Alpha-Beta-Gamma-Eta filter for a high dynamic target
Autorzy:
Jeong, T.
Njonjo, A.W.
Pan, B.F.
Powiązania:
https://bibliotekanauki.pl/articles/116598.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
integrated navigation
Alpha-Beta-Gamma filter
Benedict-Bordner filter
Simpson filter
Gray-Murray filter
target dynamics
Alpha-Beta-Gamma-Eta filter
Kalman filter
Opis:
The Alpha-Beta-Gamma tracking filter is useful for tracking a constant acceleration target with zero lag error in the steady state. It, however, depicts a constant lag error for a maneuvering target. Various algorithms of the Alpha-Beta-Gamma tracking filter exist in literature and each one of them presents its own unique challenges and advantages depending on the design requirement. This study investigates the operation of three Alpha-Beta-Gamma tracking filter design methods which include Benedict-Bordner also known as the Simpson filter, Gray-Murray filter and the fading memory constant acceleration filter. These filters are then compared based on the ability to reduce noise and follow a maneuvering target with minimum lag error, against the jerky model Alpha-Beta-Gamma-Eta. Results obtained from simulations of the input model of the target dynamics under consideration indicate an improvement in performance of the jerky model in comparison with the constant acceleration models.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 1; 55-61
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on polycarbonate nanomembrane production based on alpha particles irradiation
Autorzy:
Ziaie, F.
Shadman, M.
Yeganegi, S.
Mollaie, A.
Majdabadi, A.
Powiązania:
https://bibliotekanauki.pl/articles/148096.pdf
Data publikacji:
2009
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
track-etched membrane
micro/nanofilter
alpha particles
chemical etching
polycarbonate
Opis:
Track-etched membranes were prepared in the Dosimetry Laboratory of Agricultural, Medical and Industrial Research School by exposing polycarbonate (PC) films with a thickness of about 20 μm to alpha particles emitted from 241Am followed by chemical etching in sodium hydroxide (NaOH) at different temperatures and solution concentrations. The PC films were prepared using the method of chemical solving, forming and drying in a vacuum oven. The etching rate of PC was related to the concentration of etching solution, etching temperature and time. Therefore, a series of track-etched membranes were produced using different etching parameters. The relation between the etching rate and the etching parameters were established from experimental data and can be used to control the average pore sizes of the PC track-etched membrane. The pore sizes and their structures were studied by an optical microscope (OM) and a scanning electron microscope (SEM) and the obtained results indicated that the pores across the PC films are cylindrically shaped.
Źródło:
Nukleonika; 2009, 54, 3; 157-161
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of alpha and gamma radiolysis on Pu retention in the solvent TBP/kerosene
Autorzy:
Gao, Y
Zheng, W.
Cao, X.
Chen, S.
Powiązania:
https://bibliotekanauki.pl/articles/148296.pdf
Data publikacji:
2014
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
purex process
TBP solvent
alpha radiolysis
gamma radiolysis
Pu retention
Opis:
In light of the issue of radiolysis of the solvent system in PUREX process, alpha and gamma radiation stability of tributyl phosphate (TBP)/kerosene (OK) have been studied in this paper, in which 238Pu dissolved in the organic phase and 60Co are selected as alpha and gamma irradiation sources, respectively. The amount of the degradation products not easily removed after the washing process has been measured by the plutonium retention. The effects of the absorbed dose, the TBP volume fraction, the cumulative absorbed dose and the presence of UO2 2+ and Zr4+ on the radiolysis of the solvents have been investigated. The results have indicated that the Pu retention increases with the increase of the absorbed dose after alpha or gamma irradiation, and is larger for the solvent containing less TBP. There is competition between UO2 2+ and Pu4+ to complex with the degradation products, and Zr4+ accelerates the radiolysis of the system.
Źródło:
Nukleonika; 2014, 59, 4; 123-128
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Image segmentation and matting based on the extended distance transform
Autorzy:
Łagodziński, P.
Smołka, B.
Powiązania:
https://bibliotekanauki.pl/articles/333431.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
matowienie
przekształcenia zdalne
segmentacja
segmentation
matting
alpha-blending
distance transform
Opis:
In this paper we present a novel semi-automatic method for image segmentation and matting that utilizes the newly proposed generalized distance transform to determine the hybrid distance between the foreground and background regions within the image. This distance values are then used to estimate the alpha matting coefficient needed for composing new image by blending the foreground objects into a new background image scene. The effectiveness of the proposed algorithm allows the user to work interactively and to obtain the desired results promptly after marking the regions by scribbling the image. In the paper we show, that the proposed method yields satisfactory results for gray scale and colour images.
Źródło:
Journal of Medical Informatics & Technologies; 2008, 12; 151-156
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Features of the cortical activity of men having a high or low alpha-frequency background of the eeg while performing alternate finger movements
Autorzy:
Morenko, A.
Tsos, A.
Kotsan, I.
Powiązania:
https://bibliotekanauki.pl/articles/2052222.pdf
Data publikacji:
2014
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
power
coherency
electroencephalogram
individual alpha-frequency
alternate movements by fingers
Opis:
The purpose of this paper is to identify the cerebral electrical activity features in men with a high or low α-frequency background while performing the alternate finger movements. A test group consisting of 104 healthy men from the ages of 19 to 21 was divided into two groups according to the magnitude of their individual α- frequency (ІАF) median –groups with high (n = 53, IAF ≥10,04 Hz) and low (n = 51, IAF ≤10,03 Hz) levels of ІАF. Changes in power and the coherence of the EEG oscillations during the alternate finger movements as well as intergroup differences were evaluated. Men with high a IAF are distinguished by higher rates of speed and accuracy in terms of their sensory-motor response. The role of inhibitory neural processes increases in the case of men whose frequencies are low. The implementation of alternating finger movements in male groups is accompanied by a decrease in the coherence of θ-, α1-, α3- EEG oscillations in the cortex in general, β- and γ-activity - in the rear temporal and occipital areas. In the frontal and central lobes of α2-, β- and γ- ranges an increase in EEG coherence fuctuations was observed. The power of θ-, α- and β1- waves, especially in the posterior cortex areas, decreases. A larger degree of low-frequency fuctuations in EEG power can be observed in the frontal area. Thus, more economical brain processes providing the processing of any sensory or motor information in men with a high IAF determine higher levels of the speed and accuracy of their sensorimotor responses. Men with a low IAF have lower ductility but a higher voltage of brain processes correlated with a decrease in the sensorimotor response of speed capabilities increasing the role of inhibitory effects.
Źródło:
Health Problems of Civilization; 2014, 08, 1; 24-31
2353-6942
2354-0265
Pojawia się w:
Health Problems of Civilization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detecting the relations between meteorological elements and alpha and beta activity concentration at Al-Tuwaitha site, Baghdad
Autorzy:
Naif, Salwa S.
Al-Rbayee, Thoalfaqar
Al-Jiboori, Monim H.
Powiązania:
https://bibliotekanauki.pl/articles/35544289.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
alpha activity
beta activity
airborne radioactivity
meteorology
Al-Tuwaitha site
Opis:
In this study, 50 samples of air particulates collected from different places in- and outside the Al-Tuwaitha nuclear site, south of Baghdad were used to measure daily gross alpha and beta activity concentrations (AAC and BAC) for the period from 28 January 2015 to 13 April 2017. At the same time, several meteorological factors such as air temperature, wind speed, wind direction, air pressure, relative humidity, and solar radiation, were also measured. Air stability classes were also derived from wind speed and solar radiation. AAC/BAC variations in the surface air layer were discussed in relation to these factors. The results show that there are inverse relations between AAC/BAC and wind speed and temperature, linear relations between AAC/ABC and air pressure and weak relations between AAC/BAC and relative humidity and solar radiation. Lastly, AAC/BAC measurements in unstable air are as large as in neutral air.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2021, 30, 3; 388-399
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hepatocyte nuclear factor 4 alpha P2 promoter variants associate with insulin resistance
Autorzy:
Saif-Ali, Riyadh
Harun, Roslan
Al-Jassabi, S.
Wan Ngah, Wan
Powiązania:
https://bibliotekanauki.pl/articles/1039910.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
insulin resistance
HNF4 alpha
single nucleotide polymorphisms
haplotypes
Opis:
This study aimed to investigate the associations of hepatocyte nuclear factor 4 (HNF4) alpha single nucleotide polymorphisms (SNPs) and haplotype with insulin resistance and metabolic syndrome parameters. Nine SNPs spanning the HNF4 alpha P2 promoter (rs4810424, rs1884613 and rs1884614) and coding region (rs2144908, rs6031551, rs6031552, rs1885088, rs1028583 and rs3818247) were genotyped in 160 subjects without diabetes or metabolic syndrome. The HNF4 alpha P2 promoter SNPs rs4810424, rs1884613 and rs1884614 were associated with insulin resistance (p = 0.017; 0.037; 0.024) and body mass index (BMI) (p = 0.03; 0.035; 0.039). The intron 1D SNP rs2144908 was associated with high-density lipoprotein cholesterol (HDLc) (p = 0.020) and the intron 9 SNP rs3818247 showed association with systolic (p = 0.02) and diastolic (p = 0.034) blood pressure. HNF4 alpha common haplotype CCCGTC associated with higher insulin resistance (p = 0.022), fasting blood glucose (FBG) (p = 0.035) and lower HDLc (p = 0.001). In conclusion, subjects with HNF4 alpha P2 variants and haplotypes have been shown to have a higher insulin resistance and are therefore at a higher risk for developing type 2 diabetes mellitus.
Źródło:
Acta Biochimica Polonica; 2011, 58, 2; 179-186
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Core structure of flavonoids precursor as an antihyperglycemic and antihyperlipidemic agent: an in vivo study in rats
Autorzy:
Najafian, Mahmoud
Ebrahim-Habibi, Azadeh
Yaghmaei, Parichehreh
Parivar, Kazem
Larijani, Bagher
Powiązania:
https://bibliotekanauki.pl/articles/1040323.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
diabetes
hyperglycemia
trans-chalcone
hyperlipidemia
benzylideneacetophenone
alpha-amylase inhibitor
Opis:
trans-Chalcone is the core structure of naringenin chalcone, located halfway in the biosynthesis pathway of flavonoids. Flavonoids have been reported as mammalian alpha-amylase inhibitors, a property which could be useful in the management of postprandial hyperglycemia in diabetes and related disorders. As a mammalian alpha-amylase inhibitor in vitro, the putative beneficial effect of trans-chalcone on diabetes was tested in a streptozotocin-induced rat model of diabetes type 1, and the results analyzed with commonly used statistical methods. Significant reduction of blood glucose levels and beneficial effect on dyslipidemia were observed in diabetic rats, as well as reduction of disturbing consequences of diabetes such as high urine volume and water intake. trans-chalcone was observed to have a weight loss-inductive effect, alongside with a reduction in food intake, which is suggestive of a therapeutic potential of this compound in overweight and obese patients.
Źródło:
Acta Biochimica Polonica; 2010, 57, 4; 553-560
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Paraconvex analysis
Autorzy:
Rolewicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/970560.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
funkcja parawypukła
różniczkowalność Frecheta
alpha(.)-paraconvex functions
Frechet differentiability
Opis:
In the theory of optimization an essential role is played by the differentiability of convex functions. In this paper we shall try to extend the results concerning differentiability to a larger class of functions called strongly alpha(.)-paraconvex. Let (X, (|.||) be a real Banach space. Let f(x) be a real valued strongly alpha(.)-paraconvex function denned on an open convex subset Omega [is a subset is] X, i.e. f(tx+(1-t)y)
Źródło:
Control and Cybernetics; 2005, 34, 3; 951-965
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ANALYTICAL STUDY AND ANTIMICROBIAL ACTIVITY OF ALPHA-DEFENSIN 2 DISSOLVED IN PHARMACOPOEIA BUFFERS WITH DIFFERENT pH
Autorzy:
Amerikova, Meri N.
Zaharieva, Maya M.
Andonova, Lily A.
Pencheva-El Tibi, Ivanka P.
Maslarska, Vania
Najdenski, Hristo M.
Powiązania:
https://bibliotekanauki.pl/articles/895300.pdf
Data publikacji:
2020-02-29
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
pH
antimicrobial activity
analytical study
alpha-defensin 2
buffers
Opis:
Human neutrophil peptides (HNPs, alpha-defensins) are a group of six defensins being considered as new antimicrobial drugs because of their multifunctional efficiency against bacteria, viruses and fungi. Regardless of the unique biological properties alpha-defensins are unstable compounds and their activity depends on many physical and chemical factors as well as on the kind of the used cultivation media. This leads to research difficulties and obstructions in their therapeutic application. The purpose of this study was to determine antibacterial activity of alpha-defensin 2 dissolved in pharmacopeia buffers and in parallel to develop selective and accurate analytical tests for identification and assay of alpha-defensin 2 in the course of study. The antibacterial effect of alpha-defensin 2 was determined against the strain Escherichia coli (ATCC 25922). It was found that 10 mg/l of Human neutrophil peptide-2 (HNP-2, alpha-defensin 2) dissolved in pH 9.0 buffer caused 90% inhibition of the bacterial respiratory activity. This buffer was considered as a suitable environment for deploying the antibacterial activity of the alpha-defensin. А selective MS analysis method for identification of alpha-defensin 2 in sample mixtures was developed. Also HPLC method with alternative selectivity was elaborated for identification and assay of mixtures containing alpha-defensin 2 and aminoacids in Mueller Hinton broth. The procedure includes development of system suitability test determination.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2020, 77, 1; 3-10
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The handling of missing binary data in language research
Autorzy:
Pichette, Francois
Beland, Sebastien
Jolani, Shahab
Leśniewska, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/780779.pdf
Data publikacji:
2015-03-01
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
missing data
Cronbach's alpha
participant exclusion
second language testing
Opis:
Researchers are frequently confronted with unanswered questions or items on their questionnaires and tests, due to factors such as item difficulty, lack of testing time, or participant distraction. This paper first presents results from a poll confirming previous claims (Rietveld & van Hout, 2006; Schafer & Gra- ham, 2002) that data replacement and deletion methods are common in research. Language researchers declared that when faced with missing answers of the yes/no type (that translate into zero or one in data tables), the three most common solutions they adopt are to exclude the participant’s data from the analyses, to leave the square empty, or to fill in with zero, as for an incorrect answer. This study then examines the impact on Cronbach’s α of five types of data insertion, using simulated and actual data with various numbers of participants and missing percentages. Our analyses indicate that the three most common methods we identified among language researchers are the ones with the greatest impact  n Cronbach's α coefficients; in other words, they are the least desirable solutions to the missing data problem. On the basis of our results, we make recommendations for language researchers concerning the best way to deal with missing data. Given that none of the most common simple methods works properly, we suggest that the missing data be replaced either by the item’s mean or by the participants’ overall mean to provide a better, more accurate image of the instrument’s internal consistency.
Źródło:
Studies in Second Language Learning and Teaching; 2015, 5, 1; 153-169
2083-5205
2084-1965
Pojawia się w:
Studies in Second Language Learning and Teaching
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioethanol Production from Chlorella Pyrenoidosa by Using Enzymatic Hydrolysis and Fermentation Method
Autorzy:
Yerizam, Muhammad
Jannah, Asyeni Miftahul
Aprianti, Nabila
Powiązania:
https://bibliotekanauki.pl/articles/2202327.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Chlorella pyrenoidosa
hydrolysis
enzyme
alpha-amylase
glucose
fermentation
bioethanol
Opis:
Starch can be found in microalgae, the raw material for the third generation of bioethanol production. One of them is C. pyrenoidosa. This study was conducted to analyze the effect of α-amylase enzyme concentration on the glucose contents produced and the effects of fermentation time on bioethanol contents produced. The hydrolysis process of this study was conducted using an α-amylase enzyme produced by A. niger. Several analyses in this research were carried out, including the analysis of enzyme activity using the Fuwa method, the analysis of glucose levels from enzymatic hydrolysis using the DNS method, and the analysis of bioethanol contents using the density method and GC-MS. The highest glucose content was 0.67 mg/mL, which was obtained from the addition of 40% (v/w) α-amylase enzyme, and the yield of bioethanol content from the sample treated 40% (v/w) α-amylase enzyme and fermented for 9 days was the optimum, which produced 28.07% of bioethanol content.
Źródło:
Journal of Ecological Engineering; 2023, 24, 1; 34--40
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Funkcjonowanie pokolenia Alpha – wyzwania i zagrożenia. Rola edukacji medialnej w kształtowaniu nowej generacji
Autorzy:
Dacka, Monika
Powiązania:
https://bibliotekanauki.pl/articles/33964817.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Alpha generation
media education
family and school environment
challenges
digital hygiene
pokolenie Alpha
edukacja medialna
środowisko rodzinne i szkolne
wyzwania
higiena cyfrowa
Opis:
Celem artykułu jest przedstawienie specyfiki funkcjonowania pokolenia Alpha oraz ukazanie znaczenia podejmowania edukacji medialnej przez środowisko rodzinne i szkolne dla utrzymania higieny cyfrowej tej generacji. Artykuł ma charakter teoretyczny i obejmuje charakterystykę pokolenia Alpha, w tym ukazanie mocnych i słabszych stron tej grupy generacyjnej. Istotną częścią jest przedstawienie ważności edukacji medialnej dla kształtowania właściwych postaw, myślenia, rozumowania i wartości młodego pokolenia. Współczesne dzieci bywają opisywane jako pokolenie ekranów dotykowych czy też pierwsza generacja, która urodziła się w mediatyzowanych środowiskach domowych. Od najmłodszych lat korzystają z mediów ekranowych (telewizorów, komputerów, smartfonów, tabletów czy gier komputerowych). Dostępność osiągnięć technologicznych niewątpliwie wpływa na rozwój dzieci w sferze emocjonalnej, społecznej i motywacyjnej. Podjęte rozważania ukazują z jednej strony potencjał młodej generacji, jej potrzeby, możliwości, specyfikę funkcjonowania, a z drugiej wskazują na zasadność podejmowania edukacji medialnej. Celem dobrego wychowania medialnego powinno być również rozwijanie empatii, samodzielności, życzliwości i samokontroli oraz rozbudzanie ciekawości intelektualnej. Kształtowanie właściwych nawyków w zakresie higieny cyfrowej powinno stanowić jedno z ważniejszych zadań współczesnego procesu edukacji. Właściwe użytkowanie inteligentnych urządzeń technologicznych może przyczynić się do rozwijania poznawczych, językowych i społecznych umiejętności najmłodszych.
The aim of the article is to present the specifics of the functioning of the Alpha generation and to show the importance of undertaking media education by the family and school environment in order to maintain the digital hygiene of this generation. The article is theoretical in nature and covers the characteristics of the Alpha generation, including the presentation of the strengths and weaknesses of this generational group. An important part is the presentation of the importance of media education for shaping the right attitudes, thinking, reasoning, and values of the younger generation. Today’s children are sometimes described as the touchscreen generation or the first generation to be born into mediatized home environments. From an early age, they use screen media (televisions computers, smartphones, tablets, or computer games). The availability of technological achievements undoubtedly affects children’s development in the emotional, social, and motivational spheres. The considerations undertaken show, on the one hand, the potential of the young generation, their needs, possibilities, and the specificity of functioning, and, on the other, indicate the legitimacy of undertaking media education. The aim of good media education should also be to develop empathy, self-reliance, kindness, and self-control as well as to arouse intellectual curiosity. Shaping proper digital hygiene habits should be one of the most important tasks of the modern education process. The proper use of smart technological devices can contribute to the development of the cognitive, linguistic, and social skills of the youngest.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio J – Paedagogia-Psychologia; 2023, 36, 2; 109-123
0867-2040
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio J – Paedagogia-Psychologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uranium and polonium activities in karst water of the Niedźwiedzia Cave system (Sudety Mts.)
Autorzy:
Gąsiorowski, Michał
Hercman, Helena
Sekudewicz, Ilona
Mulczyk, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1836249.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
isotopic tracers
water circulation
alpha spectroscopy
234U/238U ratio
Opis:
Polonium and uranium activities were measured in surface and karst water in the Kleśnica Stream catchment and the Niedźwiedzia Cave system (Sudety Mts., South-West Poland). The highest polonium concentration was recorded in surface water during flood events and in a sinter pool, located close to the touristic trail inside the cave. It points to a detrital source of the polonium and its transport in water absorbed by the clay fraction. Uranium activity increases downstream in the surface water of the Kleśnica Stream, indicating significant input of 234U and 238U from an area of outcropping marble. Water, autochthonous in the marble, that originated from precipitation and infiltration directly into the cave system is characterized by low uranium content. However, the uranium activity increases with the time of water percolation in the soil and epikarst zone and is higher at the lower cave level than at the upper and middle levels. Po and U activities were used as tracers for the area of water recharge and the mode of circulation. The results point to atmospheric precipitation as the almost exclusive source of water at the upper and middle cave levels, while water at the active level of the cave is a mixture of precipitation, infiltrating directly from the area above the cave passages, and horizontal flow, originating out of the marble outcrop.
Źródło:
Annales Societatis Geologorum Poloniae; 2020, 90, 4; 505-512
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Ring Spun Yarn Wickability Using the Post-Hoc Test
Autorzy:
Elkateb, Sherien N.
Powiązania:
https://bibliotekanauki.pl/articles/24200942.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
wickability
ring spun yarn
ANOVA
Post hoc test
Bonferroni alpha
Opis:
Yarn wickability achieves high thermo-physiological comfort. Therefore, this paper aimed to investigate yarn wickability and analyze statistically factors affecting yarn wicking performance. Methodology consists of testing wicking height for ring spun yarn produced from three levels of fibre types and twist factors at two levels of doubling. Statistical tools such as ANOVA, T-test and Post-hoc tests analyzed the impacts on wicking heights. Findings showed that the Post-hoc test represented the variation between groups more accurately than ANOVA. Furthermore, a comparison of Bonferroni Alpha with T-test p-values revealed that yarn wicking was significantly affected by interactions of fibre type, doubling, and twist level.
Źródło:
Fibres & Textiles in Eastern Europe; 2023, 31, 1; 78--82
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bench testing and simulation model of a cogeneration system with a stirling engine
Autorzy:
Chmielewski, A.
Gumiński, R.
Lubikowski, K.
Radkowski, S.
Szulim, P.
Powiązania:
https://bibliotekanauki.pl/articles/242327.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
Stirling engine
Alpha
Simulink
Sankey diagram
helium and nitrogen
cogeneration
Opis:
Cogeneration systems using a Stirling engine [2] are currently being developed and promoted by the European Union [1]. On the other hand, the EU climatic package obligates Polish energy producers to buy 100% CO2 emission rights from 2020 onwards. At that time, according to the experts a ton of CO2 could reach the price of 63.5 Euro. Attention is drawn to the fact that it is only then that nuclear power plants will become profitable, in the same way as wind power plants. This could result in substantial growth of energy prices, both for the economy and for households [3]. The paper presents the experimental research of a cogeneration system with a one-way Alpha type Stirling engine. The impact of the upper heat source and the type of working gas (helium and nitrogen) on the load capacity of the cogeneration system was studied. Based on a Sankey diagram, the power spread of the cogeneration system was analysed. On the basis of experimental research, a model was created of a cogeneration system consisting of the following submodels: Stirling engine of the second order, belt transmission, electric motor and an electrochemical battery. The Stirling engine was installed in a testbed, in the mechatronic lab at the Faculty of Automotive and Construction Machinery Engineering (SIMR) of Warsaw University of Technology. Furthermore, the impact of regenerator efficiency on the efficiency of the Stirling Engine was examined, which in turns impacts the efficiency of the entire cogeneration system.
Źródło:
Journal of KONES; 2013, 20, 3; 97-104
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Weyls theorem for algebraically k-quasiclass a operators
Autorzy:
Gao, F.
Fang, X.
Powiązania:
https://bibliotekanauki.pl/articles/256003.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
algebraically k-quasiclass A operator
Weyl's theorem
alpha-Weyl's theorem
Opis:
If T or T* is an algebraically k-quasiclass A operator acting on an infinite dimensional separable Hilbert space and F is an operator commuting with T, and there exists a positive integer n such that Fn has a finite rank, then we prove that Weyl's theorem holds for ∫ (T)+F for every ∫∈ H(σ (T)), where H(σ (T)) denotes the set of all analytic functions in a neighborhood of σ (T). Moreover, if T* is an algebraically k-quasiclass A operator, then α-Weyl's theorem holds for ∫(T). Also, we prove that if T or T* is an algebraically k-quasiclass A operator then both the Weyl spectrum and the approximate point spectrum of T obey the spectral mapping theorem for every ∫∈ H(σ (T)).
Źródło:
Opuscula Mathematica; 2012, 32, 1; 125-135
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SILDENAFIL UPREGULATES TUMOR NECROSIS FACTOR α PRODUCTION IN PERIPHERAL BLOOD MONONUCLEAR CELLS OF HEALTHY MEN - PRELIMINARY REPORT
Autorzy:
Kaleta, Beata
Boguska, Agnieszka
Borysowski, Jan
Górski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/895585.pdf
Data publikacji:
2019-02-28
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
cytokines
tumor necrosis factor alpha
Sildenafil
peripheral blood mononuclear cells
Opis:
Sildenafil is a selective type 5 phosphodiesterase (PDE5) inhibitor, commonly used in the treatment of erectile dysfunction (ED) and pulmonary arterial hypertension (PAH). The results of recent studies suggest that this drug modulates function of the immune system. However, only few studies were performed in humans. Therefore, the aim of this study was to investigate the ability of sildenafil to regulate the production of pro-inflammatory cytokines including tumor necrosis factor alpha (TNF-α), interleukin (IL)-1β and IL-6 in peripheral blood mononuclear cells (PBMCs) from healthy men. Phorbol myristate acetate (PMA) - stimulated and unstimulated PBMCs from 16 participants were cultured in the absence or presence of sildenafil (400 ng/ml and 4 µg/ml). TNF-α, IL-1β and IL-6 concentrations in culture supernatants were measured by enzyme-linked immunosorbent assay (ELISA). Cell viability was assessed by trypan blue staining. Sildenafil at a concentration of 400 ng/ml significantly increased TNF-α production in stimulated PBMCs (p<0.05) but had no effects on IL-1β and IL-6. The drug did not affect PBMCs viability. This is the first report describing such effects of sildenafil in humans.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 1; 123-128
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CVD diamond detectors for fast alpha particles escaping from the tokamak D-T plasma
Autorzy:
Wodniak, I.
Drozdowicz, K.
Dankowski, J.
Gabańska, B.
Igielski, A.
Kurowski, A.
Marczewska, B.
Nowak, T.
Woźnicka, U.
Powiązania:
https://bibliotekanauki.pl/articles/146634.pdf
Data publikacji:
2011
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
CVD diamond detector
lost alpha particles
high temperature plasma diagnostics
Opis:
Measurements of the so-called lost alpha particles escaping from thermonuclear plasma in future tokamaks (such as ITER) for energy production would be essential for monitoring the energy balance in these devices. The detection would have to be carried out in a harsh environment (with high nuclear radiation fluxes, high temperature, etc.), which limits the use of common semiconductors for charged particle detection. Diamond seems to be an attractive material for alpha particle detectors in these conditions. In this paper an analysis of properties of a diamond detector for spectrometric alpha measurements is reported. A high purity CVD (chemical vapour deposition) single crystal diamond detector was used, fabricated for this dedicated application by the Diamond Detector Ltd. The energy calibration was carried out using a triple alpha particle isotope source, AMR33 (239Pu, 241Am, 244Cm). A very good energy resolution, ca. 20 keV at ca. 5.5 MeV had been obtained, which is comparable to that of the silicon detector. The linearity of the diamond detector amplitude response to the alpha particle energy was analyzed with the use of mono-energetic (0.4–2 MeV) ion beam from a Van de Graaff accelerator. Results of the measurements using the AMR33 source deviate at most 30 keV from the calibration line obtained in this way.
Źródło:
Nukleonika; 2011, 56, 2; 143-147
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fe-modified activated carbon obtained from biomass as a catalyst for α-pinene autoxidation
Autorzy:
Kamińska, Adrianna
Maciejewska, Nikola
Miądlicki, Piotr
Kiełbasa, Karolina
Sreńscek-Nazzal, Joanna
Michalkiewicz, Beata
Powiązania:
https://bibliotekanauki.pl/articles/1849280.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
activated carbon
carbonaceous catalysts
autoxidation
alpha-pinene
iron particles
biomass
Opis:
The presented work describes the autoxidation of alpha-pinene for the first time using a catalyst based on activated carbon from biomass with introduced Fe. The raw material for the preparation of the carbon material was waste orange peel, which was activated with a KOH solution. The following instrumental methods characterized the obtained catalyst (Fe/O_AC):N2 adsorption at 77 K, XRD, UV, SEM, TEM, X-ray microanalysis, and catalytic studies. It was shown that the Fe/O_AC catalyst was very active in the autoxidation of alpha-pinene. The main reaction products were: alpha-pinene oxide, verbenone, verbenol, and campholenic aldehyde.
Źródło:
Polish Journal of Chemical Technology; 2021, 23, 2; 73-80
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Commercial Kevlar derived activated carbons for CO2 and C2H4 sorption
Autorzy:
Kaliszewski, M.
Zgrzebnicki, M.
Kałamaga, A.
Pinjara, S.
Wróbel, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/1849281.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
activated carbon
carbonaceous catalysts
autoxidation
alpha-pinene
iron particles
biomass
Opis:
The carbonaceous precursor was obtained via pyrolysis of commercial aramid polymer (Kevlar). Additionally the precursor was activated at 1000°C in CO2 atmosphere for different times. Obtained materials were characterised by BET; XPS; SEM and optical microscopy. The sorption capacities were determined by temperature swing adsorption performed in TGA apparatus for CO2 and C2H4 gases. The obtained materials exhibit high difference in sorption of these gases i.e. 1.5 and 2.8 mmol/g @30°C respectively and high SSA ~1600 m2/g what can be applied in separation applications. The highest uptakes were 1.8 and 3.1 mmol/g @30°C respectively. It was found that the presence of oxygen and nitrogen functional groups enhances C2H4/CO2 uptake ratio.
Źródło:
Polish Journal of Chemical Technology; 2021, 23, 2; 81-87
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-Classical Risk Measures on the Warsaw Stock Exchange – the Application of Alpha-Stable Distributions
Nieklasyczne miary ryzyka na przykładzie Giełdy Papierów Wartościowych w Warszawie – zastosowanie rozkładów alfa-stabilnych
Autorzy:
Krężołek, Dominik
Powiązania:
https://bibliotekanauki.pl/articles/904810.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
alpha-stable distributions
Value-at-Risk
Expected Shortfall
Median Shortfall
heavy tails
Opis:
The subject of this paper is the presentation of application of the alpha-stable distributions methodology in investment risk measurement. The non-classical risk measures based on Value-at-Risk are presented: Expected Shortfall and Median Shortfall, for given quantiles. The analysis is made using daily log-returns from the WSE. The results show better estimation of empirical risk values using probability distributions belonging to the family of stable ones.
Przedmiotem artykułu jest prezentacja zastosowania metodologii rozkładów alfa-stabilnych w pomiarze ryzyka inwestycyjnego. Wykorzystano nieklasyczne mierniki ryzyka bazujące na metodologii Value-at-Risk: Expected Shortfall oraz Median Shortfall dla wybranych rzędów kwantyli. Badanie przeprowadzono dla dziennych logarytmicznych stóp zwrotu wybranych walorów Giełdy Papierów Wartościowych w Warszawie. Wyniki pokazują lepsze oszacowania rzeczywistych miar ryzyka przy wykorzystaniu rozkładów prawdopodobieństwa z rodziny stabilnych.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2013, 286
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectral analysis of EEG signals among people with different levels of personal anxiety
Autorzy:
Shvaiko, S.
Dmytrotsa, O.
Poruchynska, T.
Poruchynsky, A.
Zhuravlov, O.
Morenko, A.
Powiązania:
https://bibliotekanauki.pl/articles/972745.pdf
Data publikacji:
2018
Wydawca:
Instytut Medycyny Wsi
Tematy:
personal anxiety
encephalogram
alpha
beta
delta
theta rhythms
spectral intensity of rhythm
Opis:
Introduction. The study of electrical activity peculiarities in the cerebral cortex among people with different levels of anxiety and the dependence of EEG rhythms from the level of personal anxiety (PA) is relevant and needs to be studied. As a result of our research, we have found that during the baseline EEG among people with a moderate level of personal anxiety, the intensity of alpha rhythm predominates in the posterior areas of the cerebral cortex. People with a high level of PA had the highest rates of beta rhythm intensity. An inverse relationship between EEG main rhythms and the level of anxiety is noted. Thus, people, who were involved in our study, with the moderate level of PA had the following results: the steadier the PA, the less the intensity of the PA level. People with a high level of PA had positive connections between the alpha and beta rhythms and level of anxiety, as well as a higher activity in the right-hemisphere of the cortex, which indicates the contribution of this hemisphere in the high level PA in studies. Materials and method. The power of EEG rhythms among people (aged 18–22) with different levels of anxiety was studied. Registration of the cerebral cortex electrical activity was carried out using the «Neurocom».device. During the electroencephalogram recording, electrodes were placed on the international system 10/20. The spectral power values were analyzed in the standard physiological frequency bands: delta (1–4 Hz), theta (4–8 Hz), alpha (8–14 Hz), beta (14–35 Hz). For the spectral EEG characteristics, an absolute (ACP, μV) and relative spectral power (RSP, %) were used. The analysis of power indices was carried out in a state of rest with closed eyes (baseline),and a state of rest with open eyes during task solving as an emotional load. Results. We have found that during the EEG baseline people with the moderate level of PA had high indexes of alpha rhythm in the posterior areas of the cerebral cortex. Eyes’ opening caused an increase of the intensity of theta rhythm in the frontal area of the cerebral cortex. During the intellectual task conducting, we noticed that the increase of intensity of beta rhythm in the frontal, temporal and end-lobe parts, whereas in the central and vertex parts of the cortex the intensity of theta rhythm predominated. Among people with a high level of PA during the baseline probe, the highest rates of beta rhythm intensity in the posterior areas of the cerebral cortex were fixed. In the state of rest with open eyes, the activity of theta rhythm was revealed. The alpha rhythm had the highest rates of intensity in the posterior area of the right hemisphere. During the intellectual task, the intensity of beta rhythm predominated. In the frontal and central parts of the cortex, the intensity of theta rhythm predominated. Conclusions. During the baseline probe among people with a moderate level of PA, the intensity of alpha rhythm in the posterior areas of the cerebral cortex predominated, among people with a high level of PA – beta rhythm. eyes open caused an increase in the intensity of theta rhythm in the frontal area of the cerebral cortex of people with a moderate level of PA, and alpha rhythm in the posterior area of the right hemisphere. During the intellectual task conducted among people with a moderate level of PA, we noticed an increase in beta rhythm intensity in the frontal, temporal and end-lobe parts, but in the central and vertex parts of the cortex the intensity of theta rhythm predominated. While in another group of people who were involved in study, the intensity of beta rhythm predominated; in the frontal and central parts – theta rhythm. With a moderate level of PA, there were significant negative links between the level of anxiety and intensity of alpha, beta, theta rhythms. With a high level of PA, positive links between the intensity of alpha and beta rhythms and the level of anxiety were noticed; the intensity of EEG rhythms in this group of examined people was correlated with the right parts of the brain, which indicates to a big contribution of this part in the high level of PA among the examined people.
Źródło:
Journal of Pre-Clinical and Clinical Research; 2018, 12, 1; 22-25
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary evaluation of maternotoxic effect of Ascaris alpha-chymotrypsin inhibitor in mice
WSTĘPNA OCENA TOKSYCZNEGO DZIAŁANIA INHIBITORA о-СНУМОТВУРЗУМУ 7 ASCARIS NA ORGANIZM CIĘŻARNYCH MYSZY
Autorzy:
Blaszkowska, J.
Kadłubowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/2148308.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
parasite
pregnancy
mouse
mice
Ascaris
host organism
toxic effect
alpha-chymotrypsin inhibitor
Opis:
Administration intraperitoneally of the Ascaris α-chymotrypsin inhibitor (40-300 mg/kg/day.) at a late stage of organogenesis (8-12 days of gestation) disturbed course of mouse pregnancy. The low doses of α-chymotrypsin inhibitor (40-80 mg/kg/day) significantly decreased the number of live fetuses per litter, increased the number of fetal resorptions. The symptoms of matemal toxicity that occurred after administration of the highest doses of the inhibitor (80-300 mg/kg/day) to pregnant mice included: decreased body weight gain as compared to control, vaginal hemorrhage, intrauterine resorption of litters, abortions, altered behaviour of animals immediately after injection and death. There is a linear interrelationship between the logarithm of the doses of the inhibitor and mortality of pregnant mice. The DL50 value of the inhibitor for female was 116 mg/kg /day (confidence interval: 95.5-140.0 mg/kg/day).
Źródło:
Wiadomości Parazytologiczne; 2001, 47, 4; 705-710
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in electroencephalogram (EEG) power during subdominant (LEFT) hand finger movements in females with different alpha rhythm characteristics
Zmiany mocy elektroencefalogramu w trakcie wykonywania ruchów palcami mniej dominującej (lewej) ręki u kobiet z różnymi zmiennymi rytmu alfa
Autorzy:
Morenko, A.
Morenko, O.
Dmytrotsa, O.
Poruchynsky, A.
Korzhyk, O.
Powiązania:
https://bibliotekanauki.pl/articles/2048937.pdf
Data publikacji:
2020
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
brain
motor activity
attention
alpha rhythm
mózg
aktywność motoryczna
uwaga
rytm alfa
Opis:
Background. This study investigates the indicators of electroencephalographic (EEG) oscillatory activity and processes that are correlated with manual movements executed by the subdominant (left) hand in women with a high or a low individual α-frequency. Material and methods. 113 healthy right-handed women from the ages of 19 to 21 were divided randomly into two experimental groups with high (n = 59, IαF > 10.25 Hz) and low (n = 54, IαF ≤ 10.25 Hz) individual EEG α-frequency (IαF). EEG power during flexion or extension of the subdominant hand fingers was evaluated. Results. Manual movements performed by women, especially those exhibiting high modal α-frequency, were accompanied by reduced α and β power in mid and posterior cortical areas. These changes occurred in combination with a local power increase in α1-oscillations in the frontal leads. A local increase of α3-activity in the frontal cortex areas was also revealed in women with low IαF. In this same group of women, generalized increases in EEG power of θ-, β- and γ-oscillations were observed in the cortex. Conclusions. These results revealed a greater redundancy of brain processes in women with low IαF power compared to women with high α-frequency.
Wprowadzenie. Niniejsza praca poświęcona jest badaniu wskaźników elektroencefalograficznej aktywności oscylacyjnej i procesów, które są skorelowane z ruchami manualnymi, u kobiet z wysoką lub niską indywidualną częstotliwością α określoną podczas ruchów manualnych wykonywanych przez mniej dominującą (lewą) rękę. Materiał i metody. 113 zdrowych praworęcznych kobiet w wieku od 19 do 21 lat zostało podzielonych na dwie grupy eksperymentalne z wysoką (n = 59, IαF ≥ 10,254 Hz) i niską (n = 54, IαF ≤ 10,25 Hz) indywidualną wartością częstotliwości EEG α (IαF). U tych kobiet oceniona została aktywność EEG podczas zginania lub prostowania mniej dominujących palców. Wyniki. Ruchom manualnym wykonywanym przez kobiety, zwłaszcza o wysokiej modalnej częstotliwości α, towarzyszyło pewne zmniejszenie mocy fal EEG α i β w środkowych i tylnych obszarach kory mózgowej. Takie zmiany połączono z lokalnym wzrostem mocy w oscylacjach α1 w przednich przewodach. Lokalny wzrost aktywności α3 w obszarach kory czołowej został również ujawniony u kobiet z niską wartością IαF. Pewne uogólnione zwiększenie mocy fal EEG oscylacji θ, β i γ zaobserwowano w korze kobiet należących do tej grupy. Wnioski. Wyniki ujawniają większą nadmiarowość procesów mózgowych u kobiet z małą mocą fal IαF w porównaniu z kobietami z wysoką częstotliwością α.
Źródło:
Health Problems of Civilization; 2020, 14, 1; 63-69
2353-6942
2354-0265
Pojawia się w:
Health Problems of Civilization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and manipulating fuzzy regions: strategies to define the topological relation between two fuzzy regions
Autorzy:
Schmitz, A.
Morris, A.
Powiązania:
https://bibliotekanauki.pl/articles/970475.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
region rozmyty
relacja topologiczna
GIS
fuzzy regions
alpha-cuts
topological relations
Opis:
Topological relations between geographic objects are among the most important kinds of relations to manage in Geographic Information Systems (GIS). However, it its very expensive in storage space to keep these relations explicitly stored. Therefore, the relations are usually not directly stored, but they are inferred from the geometry of the objects. Furthermore, the inference of the topological relations is very expensive in processing time, especially when managing complex geographic objects such as fuzzy regions, or regions with multiple alpha-cuts. In this paper we argue that the topological relations between two regions with multiple alpha-cuts can be defined using the topological relations between the crisp regions that compose these two regions. In addition, we present strategies to define the topological relation between two regions with multiple alpha-cuts, with the intent to minimize the number of overlays of crisp regions to be executed to define the topological relationship between the two regions.
Źródło:
Control and Cybernetics; 2006, 35, 1; 73-95
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optymalizacja procesu rozdzielania tryptofanu i proliny w układzie faz odwróconych z wykorzystaniem mikrochromatografii cienkowarstwowej (micro-TLC) w warunkach kontrolowanej temperatury
Optimization of separation protocol of tryptophan and proline in a reversed-phase system using temperature-controlled micro-thin-layer chromatography (micro-TLC)
Autorzy:
Zarzycki, P. K.
Ślączka, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/153060.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mikrochromatografia cienkowarstwowa (micro-TLC)
tryptofan
prolina
aminokwasy
ninhydryna
współczynnik rozdzielenia α
współczynnik rozdzielenia alpha
micro-chromatography (micro-TLC)
amino acids
tryptophan
proline
ninhydrin
separation factor alpha
separation factor α
Opis:
Chromatografia cienkowarstwowa jest dogodną metodą do tzw. analiz przesiewowych (z ang. screen analysis) oraz szybkiego badania profili retencji z użyciem różnych faz ruchomych. Nasze badania dotyczą zastosowania termostatowanej mikrochromatografii cienkowarstwowej do optymalizacji procesu rozdzielania wybranych aminokwasów tryptofanu i proliny w układzie faz odwróconych (RP). Uzyskane dane retencyjne umożliwiły określenie optymalnych warunków rozdzielania przy zastosowaniu prostego parametru optymalizacji: maksymalnej wartości współczynnika rozdzielenia (αmax). Parametr ten był obliczany z dokładnością 2% stężenia binarnej fazy ruchomej w zakresie od 0 do 100%, na podstawie danych eksperymentalnych uzyskanych z rozdzielczością 20%. Wybrane kryterium optymalizacji umożliwia bezpośrednie przeniesienie uzyskanych wyników na systemy rozdzielania typu RP z użyciem kolumny zamiast płytek np. wysokosprawnej chromatografii kolumnowej (HPLC).
Thin-layer chromatography (TLC) and high-performance thin-layer chromatography (HPTLC) are commonly used in separation, identification, purification and quantification of different analytes present in complex biological, environmental and pharmaceutical samples. Planar chromatography can be also applied to screen analysis and fast exploration of chromatographic retention profiles using different concentrations of mobile phases components. This method does not require expensive equipment, tedious and time-consuming sample pretreatments and, what is important, allows a parallel separation of many samples at the same time. The spots or bands sprayed onto the TLC plate can be easily detected under visible and UV light (usually 254nm, 366nm) or by post-chromatographic derivatization with visualization reagents, and then digitalized using office scanners. It should be noted that the great advantage of micro-planar chromatography compared to the regular sized TLC is low consumption of the eluents (usually less than 1 mL per analytical run) as well as short analysis time, due to mobile phase migration distance less than 50 mm. Under particular cases (high temperature and low viscosity eluents like acetone, dichloro-methane or n-hexane), non-forced eluent flow micro-chromatographic analysis can be completed within less than 5 minutes. This work is focused on optimization of separation process of two amino acids including tryptophan and proline (Fig. 1) under reversed-phase micro-chromatographic conditions. Particularly, selected amino acids were chromatographed on HPTLC RP-18W (wettable with water) 25 x 50 mm cutted plates using thermostated horizontal micro-chamber and unsaturated conditions (Fig. 2). The target components were sprayed on the start line (1Μg per lane) using a semi-automatic sampler (Linomat 5, Camag). The plates were developed with n-propanol: water binary mixtures as the mobile phases. Different concentrations of alcohol ranging from 0 to 100% (v/v) with steps of 20% were applied. The temperature of chromatographic separation was set at 40oC and chromatographic runs were completed within 10-30 minutes, depending on the water concentration in the mobile phase. The amino acids were visualized by dipping the plates in ninhydrin solution (prepared for concentration 0.3% in ethanol) followed by heating at 120°C for 10 minutes. Picture acquisition was performed using a Plustek OpticPro S12 scanner with an 8-bit per channel color deep mode, 300 DPI resolution, and saved as TIFF files. Retention data were derived from the plates via densitometric scans obtained with help of ImageJ freeware (http://rsb.info.nih.gov/ij). Using the raw retention data set (RF values, retardation factor), the chromatographic profiles of amino acids were calculated with step of 2% (Fig. 3A). Based on the curves observed and relationship RM = logk, where RM and k correspond to mobility and retention factors, respectively, a simple optimization criterion expressed as a separation factor (α) was calculated (Fig. 3B). Using this plot, the best separation conditions of target components were selected taking into account the maximum value of the separation factor (αmax). Due to the equal spot shape of amino acids investigated across the whole range of the mobile phases composition, such approach involving the α values allows fast optimization of separation in planar chromatography and direct application of selected conditions into column chromatographic systems based on e.g. high-performance liquid chromatography (HPLC). It should be noted that the advantages of retention data screening using micro-TLC are very low mobile phase consumption (at level of 300 ΜL per chromatographic run), short analysis time and effective detection of UV-Vis transparent substances using simple visualization reagent.
Źródło:
Pomiary Automatyka Kontrola; 2011, R. 57, nr 6, 6; 624-626
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A practical algorithm management of patients with benign prostatic hyperplasia
Autorzy:
Dutkiewicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/3168.pdf
Data publikacji:
2008
Wydawca:
Instytut Medycyny Wsi
Tematy:
algorithm management
human disease
patient
benign prostate hyperplasia
hyperplasia
man
urinary outflow obstruction
enlargement
prostate
alpha1-adrenoreceptor blocker
5-alpha-reductase inhibitor
combination therapy
surgical treatment
Źródło:
Journal of Pre-Clinical and Clinical Research; 2008, 02, 2
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Approaches to the Book Alpha Meizon of Aristotle’s Metaphysics and to its Unique Neoplatonic Commentary by Asclepius of Tralles
Autorzy:
Wesoły, Marian
Powiązania:
https://bibliotekanauki.pl/articles/633509.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
R. Loredana Cardullo
Il libro Alpha della Metafisica di Aristotele tra storiografia e teoria
A sclepio di Tralle
Commentario al libro Alpha Meizon (A) della Metafisica
Aristotele
Opis:
R. Loredana Cardullo (a cura di), Il libro Alpha della Metafisica di Aristotele tra storiografia e teoria, Catania 2009, pp. 294. R. Loredana Cardullo, A sclepio di Tralle. Commentario al libro Alpha Meizon (A) della Metafisica di Aristotele. Intoduzione, testo greco, traduzione e note di commento, Acireale-Roma 2012, pp. 512.Paris 2012, pp. 164.
Źródło:
Peitho. Examina Antiqua; 2013, 4, 1; 307-310
2082-7539
Pojawia się w:
Peitho. Examina Antiqua
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czynniki dobrej odpowiedzi na leczenie przeciwwirusowe zakażenia HBV
Factors that predict response to hepatitis B treatment
Autorzy:
Janocha-Litwin, Justyna
Simon, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/552866.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych
Tematy:
hepatitis B
predictors of response
treatment
interferon alpha
nucleo-ti(-si)de analogues
Opis:
Duża liczba osób zakażonych wirusem zapalenia wątroby typu B na świecie i w Polsce oraz ograniczona dostępność i skuteczność leczenia przyczynowego wymusza poznanie czynników odpowiedzi na stosowaną terapię. Ma to na celu wybranie jak najlepszego leku oraz możliwość modyfikacji leczenia w trakcie terapii. W pracy omówiono poznane czynniki/znaczniki odpowiedzi na leczenie zakażenia HBV. Czynnikami dobrej odpowiedzi na terapię PEG-IFN wyjściowo są: niska wiremia HBV DNA , obecność HBeAg, wysoka aktywność Al at, genotyp A lub B HBV oraz wysoka aktywność zapalna w badaniu histopatologicznym bioptatu wątroby. Monitorowanie skuteczności leczenia przeciwwirusowego oceną wiremii HBV DNA metodą PCR , ilościowego oznaczania HBsAg, HBeAg i kinetyki spadku tych stężeń umożliwia modyfikację leczenia w trakcie jego trwania. Dalej istnieje potrzeba selekcjonowania nowych czynników pozwalających przewidywać skuteczność prowadzonego leczenia przeciwwirusowego u zakażonych HBV w celu ograniczenia ryzyka rozwoju odległych powikłań, tj. rozwoju marskości wątroby ze wszystkimi następstwami, oraz raka wątrobowokomórkowego
A large number of people infected with hepatitis B virus in Poland and the world as well as limited availability and efficiency of causal therapy necessitate further research on predictors of response to the therapy. It has to provide choosing the best medication and capability to modify the therapy. The paper discusses predictors of responses to the HBV therapy. Factors associated with response to PEG-IFN therapy are: low HBV DNA level, HBeAg presence, high Al at activity and active inflammation in histopathological examination of the liver biopsy. Modification of the therapy is possible by monitoring its effectiveness by using the assessment of HBV DNA levels with PCR method, HBsAg quantification and kinetics of the decrease in their concentrations. There is still a need to discover new factors that will let predict the efficiency of the antiviral therapy in HBV positive patients to decrease the risk of developing the long-term complications such as liver cirrhosis and hepatocellular cancer
Źródło:
Family Medicine & Primary Care Review; 2014, 1; 44-47
1734-3402
Pojawia się w:
Family Medicine & Primary Care Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Induced m=0 instability in fast ablative capillary discharges and possible utilisation for X-ray lasers
Autorzy:
Ellwi, S.
Andreic, Z.
Ferri, S.
Juschkin, L.
Koshelev, K.
Kunze, H.
Powiązania:
https://bibliotekanauki.pl/articles/146997.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Balmer-alpha of CVI
capillary discharge
charge exchange
induced instability
X-ray lasers
Opis:
High current linear discharges confined by their own magnetic field are subject to magneto-hydrodynamic instabilities which perturb a straight plasma column. An example is the m=0 mode, which is characterised by the development of necks contracting rapidly towards the axis with the ion sound speed. Discharges through capillaries were assumed to be stable hitherto, but by cutting capillaries lengthwise after a few shots hot spot traces clearly imprinted on the inner wall of the capillary are observed. They are interpreted as marks of an m=0 instability, and this interpretation is substantiated by a series of time-gated pinhole images, which show that the hot plasma region is clearly detached from the wall at the second current maximum and concentrated on the axis thus making the development of the instability possible. The instability occurs only with a specific sample of polyacetal as wall material, and its axial wavelength increases with the length of the capillary. By modulating respectively the inner wall of the capillary the wavelength can be imposed within limits. This is exploited for a soft X-ray laser scheme based on charge exchange pumping of bare carbon ions of hot plasma streaming from the necks and colliding with cold plasma outside the neck regions. Exponential growth of the Balmer-alfa line of CVI at 18.22 nm is realised.
Źródło:
Nukleonika; 2001, 46, 1; 1-3
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Filtration approach to mitigate indoor thoron progeny concentration
Autorzy:
Wang, J.
Meisenberg, O.
Chen, Y.
Karg, E.
Tschiersch, J.
Powiązania:
https://bibliotekanauki.pl/articles/148751.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
filtration
thoron progeny
potential alpha energy concentration (PAEC)
equilibrium equivalent concentration (EEC)
mitigation
Opis:
This study investigates filtration of air as potential mitigation method of thoron progeny exposure. The experiments were conducted in a model room (volume 7.1 m3) which was equipped with a pump and an HEPA (high efficiency particulate air) filter. Filtration at a rate of 0.2, 0.4, 0.5 and 0.8 h–1 during 88 h proved an effective practice in reducing the total indoor thoron decay product concentration. The results indicate that 0.4–0.8 h–1 filtration rate had almost the same filtration efficiency in decreasing the total thoron EEC (equilibrium equivalent concentration) by 97 per cent while 80 per cent of total thoron EEC were reduced by 0.2 h–1 filtration rate; meanwhile, the unattached thoron EEC rose significantly by 190, 270, 290 per cent, respectively under 0.4–0.8 h–1 filtration rate, whereas 0.2 h–1 filtration rate increased unattached thoron EEC by 40 per cent. The aerosol number size distribution variation reveals that filtration operation removes smaller particles faster or earlier than the larger ones. The annual effective dose calculated was reduced by 91–92 per cent at a filtration rate of 0.4–0.8 h–1 while 75 per cent reduced at 0.2 h–1 filtration rate after 88 h filtration process.
Źródło:
Nukleonika; 2010, 55, 4; 445-450
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in the alkaloid, alpha-galactoside and protein fractions content during germination of different lupin species
Autorzy:
Chilomer, K
Zaleska, K.
Ciesiolka, D.
Gulewicz, P.
Frankiewicz, A.
Gulewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/57288.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
alkaloid
alpha-galactoside
protein fraction
protein content
germination
lupin
plant species
amino acid
Opis:
The objective of our studies were seeds of two lupin species Lupinus luteus L. and Lupinus angustifolius L. cvs. Lord and Graf respectively. Lupin seeds were germinated at 15 and 24°C and during two, three and four days. In the lupin sprouts antinutritional factors: alkaloids and raffinose family oligosaccharides (RFOs) and five nitrogen fractions: non protein (Nnp), albumin (A), globulin (G), glutelin and prolamin (Gt+P) and nitrogen residue fraction (Nr) were determined. The level of these compounds was compared with the proper ones of initial material (not germinated seeds). These studies showed that the germination process clearly affects the decrease of antinutritional factors: RFOs and alkaloids. The decrease level of these compounds depended on such factors like, lupin species and used germination conditions. It was found on the base of nitrogen analysis of particular protein fractions that the germination process of lupin seeds causes deep quantitative and qualitative changes in fractional composition of lupin proteins. It especially concerns the decrease of globulin and residual fraction content and distinct increase of Nnp fraction. The changes in other fractions were not so unequivocal in comparison with the mentioned above and depended on lupin species, temperature and time of germination. Qualitative changes of A, G and Gt+P fractions caused by germination were confirmed by gel electrophoresis (SDS-PAGE). The amino acid analysis of seeds and sprouts of Nnp fractions showed an increased content of Asp, Ser, Ala, Pronon essential amino acids (NEAA), and Val, Met, iLeu, Leu, Thressential amino acids (EAA). Simultaneously a decrease of Glu, Arg (NEAA), Phe, Lis, Cys (EAA) contents was observed. Generally the germination process causes the decrease of total NEAA and an increase of total EAA in Nnp fractions of both lupin species.
Źródło:
Acta Societatis Botanicorum Poloniae; 2010, 79, 1; 11-20
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution and pharmacology of alpha 2-adrenoceptors in the central nervous system
Autorzy:
MacDonald, E
Scheinin, M.
Powiązania:
https://bibliotekanauki.pl/articles/69473.pdf
Data publikacji:
1995
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
brain
alpha 2-adrenoceptor
idazoxan
atipamezole
dexmedetomidine
noradrenergic neuron
pharmacology
central nervous system
Źródło:
Journal of Physiology and Pharmacology; 1995, 46, 3
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie radionuklidu 210Po w badaniach osadów dennych
The use of 210Po radionuclide in sediment research
Autorzy:
Szarlowicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/126279.pdf
Data publikacji:
2018
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
210Po
osady denne
spektrometria alfa
zmiany środowiskowe
sediments
alpha spectrometry
environmental changes
Opis:
Pierwiastki promieniotwórcze stanowią nieodłączną część środowiska naturalnego. Ich obecność w różnych komponentach środowiska, w tym osadów dennych, jest wykorzystywana np. do oceny stanu środowiska wodnego. Radionuklid 210Po jest alfa emiterem, pochodzącym z szeregu uranowo-radowego. Celem pracy było oznaczenie 210Po w 1 cm warstwach osadów dennych pobranych z Toporowych Stawów (Niżni i Wyżni) usytuowanych na terenie Tatr. Zawartości polonu wzdłuż profilu głębokościowego wykorzystano do interpretacji zmian środowiskowych, jakie miały miejsce w zlewniach obu jezior. Próbki osadów pobrano za pomocą czerpacza firmy Limnos, podzielono na 1 cm warstwy, wysuszono w temperaturze pokojowej i poddano analizie radiochemicznej. Uzyskane źródła promieniotwórcze 210Po zmierzono w spektrometrze promieniowania alfa. Radioaktywność 210Po w Toporowych Stawach mieści się w zakresie od 23,6±2,4 do 692±42 Bq·kg-1 (Niżni); 40,9±3,7 do 575±48 Bq·kg-1 (Wyżni). W obu stawach obserwowano spadek radioaktywności 210Po z tym, że w Wyżnim ma ona charakter nieregularny. Podsumowując, stwierdzono, że położenie, otoczenie i niska retencja wód (Wyżni) wpływają na zawartość 210Po. Uzyskane wyniki pozwalają na sformułowanie wniosków w zakresie źródeł dostawy materiału i czynnikach mających wpływ na proces sedymentacji. Mogą być również wykorzystywane w celach geochronologicznych (metoda 210Pb), do przedstawienia zmian, jakie miały miejsce w otoczeniu zlewni na przestrzeni 200 lat.
Radioactive elements are an integral part of the natural environment. Their presence in various components of the environment, including sediments, is used for estimation of the state of the water ecosystem. Radionuclide 210Po is a decay product in the uranium-radium series. The aim of this work was to determine 210Po radioactivity in 1 cm layer collected from Toporowe Stawy Lakes (Tatra mountains). The radioactivity of 210Po was used as indicators for studying environmental changes in the area of lakes. Sediments’ cores were sampled using Limnos gravity corer. The cores were sliced to 1 cm layers in situ, and packed into polyethylene vessels. Before radiochemical analysis the samples were air dried. The alpha sources of 210Po were measured in alpha spectrometer. The 210Po radioactivity varied in the range from 23.6±2.4 to 692±42 Bq·kg-1 (Nizni); 40.9±3.7 to 575±48 Bq·kg-1 (Wyzni). In both lakes, the decrease in the radioactivity was observed. In Wyzni lake there are some irregularities down the sediment core. It can be concluded that the location, environment and low water balance (Wyzni) affect the 210Po content. The obtained results allow to estimate sources of material delivery and factors influence on the value of sedimentation rate. They can be used also for geochronology research (210Pb method), to show environmental changes in the past 200 years.
Źródło:
Proceedings of ECOpole; 2018, 12, 2; 579-585
1898-617X
2084-4557
Pojawia się w:
Proceedings of ECOpole
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Taking a Stand through Digital Games - An empirical procedure among consciousness, learning and participation
Autorzy:
Gandolfi, Enrico
Powiązania:
https://bibliotekanauki.pl/articles/1037577.pdf
Data publikacji:
2018
Wydawca:
Academicus. International Scientific Journal publishing house
Tematy:
creative methods
crusader kings 2
qualitative methodology
sid meier’s alpha centauri
sustainability
Opis:
The article focuses on an empirical procedure aimed to harness digital games in exploring sensible issues in social research. By merging qualitative and creative methods and taking into account suggestions from Sociology, Media Studies, and Game Studies, the suggested approach combines single interviews, focus groups and participative design exercises according to a creative learning path. In order to put its effectiveness to the test, four groups of players (N: 20) with different attitudes toward play were recruited for addressing the theme of sustainability. The digital games Crusader Kings 2 and Sid Meier’s Alpha Centauri were selected as facilitating tools due to the related pertinence. Results show an increment of consciousness and awareness about the topic and a noteworthy potential in engaging subjects and stimulating their feedback in empirical investigations. In turn, some limits emerged to the extent that further interventions are required to stress and relativize the proposal.
Źródło:
Academicus International Scientific Journal; 2018, 17; 62-81
2079-3715
2309-1088
Pojawia się w:
Academicus International Scientific Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the new Monte Carlo code AlfaMC to the calibration of alpha-particle sources
Autorzy:
Jurado Vargas, M.
Fernández Timón, A.
García Orellana, C.
Powiązania:
https://bibliotekanauki.pl/articles/148497.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
alpha-particle spectrometry
code AlfaMC
Monte Carlo simulation
scattering and self-absorption
Opis:
Measurements of α-particle sources require corrections to the counting rate due to scattering and self- -absorption in the source and the backing material. In this study, we describe a simple procedure to estimate these corrections using the new Monte Carlo code AlfaMC to consider the effects of scattering and self-absorption conjointly, and so to determine the activity of α emitters. The procedure proposed was applied to 235UO2 sources deposited on highly polished platinum backings. In general, the dependence of the efficiency with source thickness was in good agreement with a simple model considering a linear and a hyperbolic behavior for thin and thick sources, respectively, although significant deviations from this model were found for very thin sources. For these very thin sources, the Monte Carlo simulation revealed to be as a required method in the primary calibration of α-particle sources. The efficiency results obtained by simulation with AlfaMC were in agreement with available efficiency data.
Źródło:
Nukleonika; 2015, 60, No. 3, part 2; 651-655
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Activity of alpha-fucosidase and beta-glucuronidase in serum and urine of patients administered parenteral nutrition
Autorzy:
Raczkowska, K.
Szajda, S.D.
Raczkowski, K.
Zasadowska, W.
Chojnowska, S.
Kepka, A.
Zalewska-Szajda, B.
Waszkiewicz, N.
Knas, M.
Snarska, J.
Zwierz, K.
Ladny, J.R.
Powiązania:
https://bibliotekanauki.pl/articles/874170.pdf
Data publikacji:
2013
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
alpha-fucosidase
beta-glucuronidase
serum
urine
patient
parenteral nutrition
malnutrition
enzyme activity
Opis:
Background. In hospital patients suffering from adverse clinical and biochemical symptoms of malnutrition, it is often necessary to employ parenteral nutrition to avoid the body’s tissue becoming broken down by being metabolised. Thus, the patient’s welfare and survival can be supported throughout any periods of medical crisis. Two of the enzymes responsible for metabolising glycoconjugates are a-fucosidase (FUC) and p-glucuronidase (GLU), present in lysosomes. They release fucose or glucuronic acid from the non-reducing end of oligosaccharide chains. Objective. To determine the effect of parenteral nutrition administered to ill patients, on glycoconjugate metabolism, by measuring serum and urinary activities of FUC and GLU. Material and methods. Blood samples and the daily urine collection were taken from 23 patients’ who had been undergoing parenteral nutrition for either 5 or 10 days, as well as from a baseline sample. Enzyme activities in serum and urine were determined by the method of Zwierz et al. Results. Serum FUC activities were significantly lower after 10 days compared to 5, (p< 0.0172), whereas GLU activities were significantly lower after both 5 and 10 days, (p< 0.0007 and p< 0.0208 respectively), compared to levels before starting parenteral nutrition. GLU activities were however higher after 10 days than those after 5 days, (p< 0.0023). In urine, FUC activities were significantly decreased after 10 days compared to 5 days after starting parenteral nutrition, (p< 0.0245). Urine GLU activities were unaffected by parenteral nutrition nor was any effect seen on FUC or GLU activities when calculated per 1mg creatinine. Conclusions. Serum FUC and GLU activities can be used for assessing the effect of parenteral nutrition on glycoconjugate metabolism. The significant decreases of serum GLU activity observed after 5 and 10 days, may serve to indicate that the components of parental nutrition are appropriate and that the body has become suitably adapted to this form of nutrition.
Wprowadzenie. Kliniczne lub biochemiczne objawy niedoborów pokarmowych stwarzają konieczność wdrożenia żywienia pozajelitowego w celu ograniczenia katabolizmu własnych tkanek i stworzenia warunków umożliwiających choremu przetrwanie krytycznego okresu, a-fukozydaza (FUC) i P-glukuronidaza (GLU) są enzymami lizosomalnymi uczestniczącymi w katabolizmie glikokoniugatów. Odcinają fukozę (FUC) lub kwas glukuronowy (GLU) od nieredukującego końca łańcuchów oligosacharydowych. Cel . Celem badań było zbadanie wpływu żywienia pozajelitowego na katabolizm glikokoniugatów poprzez ocenę aktywności FUC i GLU w surowicy krwi i moczu chorych żywionych pozajelitowo. Materiał i metody. Krew z żyły łokciowej oraz mocz z dobowej zbiórki pobrano od 23 pacjentów żywionych pozajelitowo trzykrotnie: przed rozpoczęciem żywienia pozajelitowego, w piątej oraz dziesiątej dobie alimentacji dożylnej. Aktywność FUC i GLU w surowicy krwi i moczu oznaczano metodą kolorymetryczną Zwierza i wsp. Wyniki. W trakcie żywienia pozajelitowego, stężenie aktywności FUC w surowicy krwi uległo istotnemu obniżeniu w dziesiątej dobie (p<0,0172), w porównaniu do doby piątej, żywienia pozajelitowego. Stężenie aktywności GLU istotne obniżyło się (p<0,0007) w piątej oraz (p<0,0208) dziesiątej dobie, w porównaniu do aktywności przed zastosowaniem żywienia pozajelitowego. Stężenie aktywności GLU istotnie rosło (p<0,0023) w dziesiątej dobie, w porównaniu do piątej doby żywienia pozajelitowego. Stężenie aktywności FUC w moczu uległo istotnemu obniżeniu (p<0,0245) w dziesiątej dobie, w porównaniu do piątej doby żywienia pozajelitowego. Żywienie pozajelitowe nie wpływa istotnie na stężenie aktywności GLU w moczu oraz moczowe aktywności FUC i GLU przeliczane na 1 mg kreatyniny. Wnioski. Stężenia aktywności FUC i GLU w surowicy mogą być użyte do oceny wpływu żywienia pozajelitowego na katabolizm glikokoniugatów. Istotne obniżenie aktywności GLU w surowicy krwi w 5 i 10 dniu pozajelitowego żywienia, może świadczyć o prawidłowym doborze składników i adaptacji organizmu do żywienia pozajelitowego.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2013, 64, 3
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary evaluation of maternotoxic effect of Ascaris alpha-chymotrypsin inhibitor in mice
Autorzy:
Blaszkowska, J
Kadlubowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/839388.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
parasite
pregnancy
mouse
mice
Ascaris
host organism
toxic effect
alpha-chymotrypsin inhibitor
Opis:
Administration intraperitoneally of the Ascaris α-chymotrypsin inhibitor (40-300 mg/kg/day.) at a late stage of organogenesis (8-12 days of gestation) disturbed course of mouse pregnancy. The low doses of α-chymotrypsin inhibitor (40-80 mg/kg/day) significantly decreased the number of live fetuses per litter, increased the number of fetal resorptions. The symptoms of matemal toxicity that occurred after administration of the highest doses of the inhibitor (80-300 mg/kg/day) to pregnant mice included: decreased body weight gain as compared to control, vaginal hemorrhage, intrauterine resorption of litters, abortions, altered behaviour of animals immediately after injection and death. There is a linear interrelationship between the logarithm of the doses of the inhibitor and mortality of pregnant mice. The DL50 value of the inhibitor for female was 116 mg/kg /day (confidence interval: 95.5-140.0 mg/kg/day).
Źródło:
Annals of Parasitology; 2001, 47, 4
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intensyfikacja wykorzystania ekstraktu chmielowego do produkcji piwa
Autorzy:
Skorek, U.
Hubicki, Z.
Rój, E.
Powiązania:
https://bibliotekanauki.pl/articles/143392.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:
ekstrakt chmielowy
alfa-kwasy
izomeryzacja
produkcja piwa
hop extract
alpha-acids
isomerization
beer production
Opis:
Dokonano przeglądu metod intensyfikacji wykorzystania ekstraktów chmielowych poprzez ich izomeryzację. Omówiono dostępne izomery w obrocie handlowym wraz z ich charakterystyką. Przedstawiono Nowe Międzynarodowe Normy do analizy ilościowej zizomeryzowanych a-kwasów metodą chromatografii HPLC .
Źródło:
Chemik; 2011, 65, 3; 160-163
0009-2886
Pojawia się w:
Chemik
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FPGA realization of an improved alpha max plus beta min algorithm
Autorzy:
Czyżak, M.
Smyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/376709.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
square root computation
alpha max plus beta min algorithm
field programmable gate array (FPGA)
Opis:
The improved version of the alpha max plus beta min square-rooting algorithm and its realization in the Field Programmable Gate Array (FPGA) are presented. The algorithm computes the square root to calculate the approximate magnitude of a complex sample. It is especially useful for pipelined calculations in the DSP. The improved version allows to reduce the peak error from about 4% to 0.33%. This is attained by determination of the approximate ratio of arguments and adequate selection of algorithm coefficients. Four approximation regions are used and hence four sets of coefficients. Also a Xilinx FPGA implementation for 12-bit sign magnitude numbers is shown.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2014, 80; 151-160
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-standard analysis revisited: An easy axiomatic presentation oriented towards numerical applications
Autorzy:
Benci, Vieri
Cococcioni, Marco
Fiaschi, Lorenzo
Powiązania:
https://bibliotekanauki.pl/articles/2055153.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
Alpha Theory
non-standard analysis
non Archimedean analysis
algorithmic numbers
non Archimedean scientific computing
Opis:
Alpha-Theory was introduced in 1995 to provide a simplified version of Robinson’s non-standard analysis which overcomes the technicalities of symbolic logic. The theory has been improved over the years, and recently it has been used also to solve practical problems in a pure numerical way, thanks to the introduction of algorithmic numbers. In this paper, we introduce Alpha-Theory using a novel axiomatic approach oriented towards real-world applications, to avoid the need to master mathematical logic and model theory. To corroborate the strong link of this Alpha-Theory axiomatization and scientific computations, we report numerical illustrative applications never carried out by means of non-standard numbers within a computer, i.e., the computation of the eigenvalues of a non-Archimedean matrix, some computations related to non-Archimedean Markov chains, and the Cholesky factorization of a non-Archimedean matrix. We also highlight the differences between our numerical routines and pure symbolic approaches: as expected, the former scales better when the dimension of the problem increases.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2022, 32, 1; 65--80
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Omeprazole fails to suppress up-regulation of gastric mucosal endothelin-converting enzyme-1 by Helicobacter pylori lipopolysaccharide
Autorzy:
Slomiany, B.L.
Piotrowski, J.
Slomiany, A.
Powiązania:
https://bibliotekanauki.pl/articles/69480.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
omeprazole
sulglycotide
tumour necrosis factor-alpha
lipopolysaccharide
acute gastritis
gastric mucosa
ebrotidine
Helicobacter pylori
Źródło:
Journal of Physiology and Pharmacology; 2000, 51, 3
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deconvolution of alpha spectra from air filters applied for measurements of the short-lived radon progeny concentration
Autorzy:
Skubacz, K.
Powiązania:
https://bibliotekanauki.pl/articles/148906.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
alpha spectroscopy
ambient pressure
spectrum analysis
non-linear regression
radon progeny
thoron progeny
Opis:
The paper contains a description of a method for the analysis of the complex alpha spectra generated during the measurement of the activity of filters outside of a vacuum chamber under environmental conditions. The peaks corresponding to the energies of alpha particles emitted by the specific isotopes are particularly large on the low-energy side of the peak maximum, and the energy resolution strongly depended on the applied filters. The analysis was based on the non-linear regression to a function designed for four, six and eight parameters. Satisfactory results were obtained for each of these functions, and the best-fitting results were achieved for the eight-parameter function. In addition, the uncertainties related to the estimated parameters, as well as the signals corresponding to functions that describe the shape of the energy peak, have been evaluated. There are also examples of the implementation of the method with respect to short-lived radon progeny and thoron decay products.
Źródło:
Nukleonika; 2017, 62, 3; 229-234
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of proteolysis inhibitors from Ascaris lumbricoides suis on developing chicken embryos
Autorzy:
Blaszkowska, J.
Wojcik, A.
Powiązania:
https://bibliotekanauki.pl/articles/840148.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
parasite
Ascaris lumbricoides suis
trypsin inhibitor
proteolysis
chicken
inhibitor
embryo
alpha-chymotrypsin inhibitor
Źródło:
Annals of Parasitology; 1998, 44, 3
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Protective role of endogenous nitric oxide (NO) in lipopolysaccharide - induced pancreatic damage. (A new experimental model of acute pancreatitis)
Autorzy:
Jaworek, J.
Jachimczak, B.
Bonior, J.
Kot, M.
Tomaszewska, R.
Karczewska, E.
Stachura, J.
Pawlik, W.
Konturek, S.J.
Powiązania:
https://bibliotekanauki.pl/articles/69269.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
acute pancreatitis
pancreatic damage
tumour necrosis factor-alpha
lipopolysaccharide
nitric oxide
pancreatic inflammation
Źródło:
Journal of Physiology and Pharmacology; 2000, 51, 1
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie ilościowego oznaczania octanu α-tokoferolu w preparatach farmaceutycznych metodą mikroemulsyjnej chromatografii elektrokinetycznej oraz ultraszybkiej chromatografii cieczowej
Comparison of quantitative determination of α-tocopherol acetate in pharmaceutical preparations by microemulsion electrokinetic chromatography and ultrafast liquid chromatography
Autorzy:
Wideł, D.
Oszczudłowski, J.
Witkiewicz, Z.
Moczulski, M.
Powiązania:
https://bibliotekanauki.pl/articles/142649.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:
mikroemulsyjna chromatografia elektrokinetyczna
witamina E
octan α-tokoferolu
octan alpha-tokoferolu
mikroemulsja
ultraszybka chromatografia cieczowa
microemulsion electrokinetic chromatography
vitamin E
α tocopherol acetate
alpha tocopherol acetate
microemulsion
ultrafast liquid chromatography
Opis:
W artykule opisano zastosowanie mikroemulsyjnej chromatografii elektrokinetycznej (MEEKC) do ilościowego oznaczania witaminy E w postaci octanu α-tokoferolu. Analizę wykonano za pomocą aparatury do elektroforezy kapilarnej, zaopatrzonej w detektor z matrycą diodową. W kapilarze stosowano mikroemulsję o składzie: 10% (w/w) SDS, 6,6% (w/w) 1-butanolu, 0,8% (w/w) n-oktanu, 12,5% (w/w) 2-propanolu, 40% (w/w) buforu fosforanowego o pH=2,5 oraz 30,1% (w/w) wody demineralizowanej. Oznaczanie ilościowe witaminy E wykonano metodą wzorca zewnętrznego z wykorzystaniem oprogramowania 32 Karat ver. 8.0 Beckman Coulter Inc. Dodatkowo wykonano oznaczanie ilościowe witaminy E metodą ultraszybkiej chromatografii cieczowej (UFLC) w celu porównania wyników z metodą MEEKC.
In the present work microemulsion electrokinetic chromatography (MEEKC) was applied for quantitative determination of vitamin E in α-tocopherol acetate form. Capillary electrophoresis system with diode array detector was used to perform the analysis. Microemulsion consists of: 10 % (w/w) SDS, 6.6 % (w/w) 1-butanol, 0.8 % (w/w) n-octane, 12.5 % (w/w) 2-propanol, 40% (w/w) phosphate buffer with pH=2.5 and 30.1 % (w/w) demineralized water, was used in capillary. The quantitative determination of vitamin E was performed with the external standard method with the use of the 32 Carat ver. 8.0 software from Beckman Coulter Inc. Additionally the quantitative determination of the vitamin E by ultrafast liquid chromatography (UFLC) method was performed for the purpose of the comparison of results with the MEEKC method.
Źródło:
Chemik; 2013, 67, 2; 111-118
0009-2886
Pojawia się w:
Chemik
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
9alpha-hydroxyparthenolide in Zoegea leptaurea subsp. mesopotamica (Czerep.) Rech. (Asteraceae)
9alfa-hydroksypartenolid w Zoegea leptaurea subsp. mesopotamica (Czerep.) Rech. (Asteraceae)
Autorzy:
Nawrot, J.
Dawid-Pac, R.
Kaczerowska-Pietrzak, K.
Urbanska, M.
Nowak, G.
Powiązania:
https://bibliotekanauki.pl/articles/72392.pdf
Data publikacji:
2015
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:
9-alpha-hydroxyparthenolide
isolation
identification
spectral analysis
plant material
Zoegea leptaurea ssp.mesopotamica
Compositae
chemotaxonomy
Opis:
From the aerial parts of Zoegea leptaurea subsp. mesopotamica (Czerep.) Rech. (syn Zoegea mesopotamica Czerep.), 9α-hydroxyparthenolide was isolated. This compound was identified by spectral methods (1H NMR and 13C NMR). This research confirmed earlier indications about the presence of 4,5-epoxygermacranolides in the Zoegea L. genus. Thus, distinctive chemistry feature of plants in this taxon has chemotaxonomic implications.
Z ziela Zoegea leptaurea subsp. mesopotamica (Czerep.) Rech. (syn Zoegea mesopotamica Czerep.) wyizolowano 9α-hydroksypartenolid. Związek ten zidentyfikowano za pomocą analiz spektralnych (1H NMR i 13C NMR). Potwierdzono tym samym wcześniejsze doniesienia o występowaniu 4,5-epoksygermakranolidów w rodzaju Zoegea L. Uzyskane dane mają walor chemotaksonomiczny.
Źródło:
Herba Polonica; 2015, 61, 2
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sample clean-up by on-line chromatography for the determination of Pu and Am in sediments
Oczyszczanie próbek przez ciągłą chromatografię przy oznaczaniu Pu i Am w osadach
Autorzy:
Jernstrom, J.
Betti, M.
Powiązania:
https://bibliotekanauki.pl/articles/340747.pdf
Data publikacji:
2004
Wydawca:
Główny Instytut Górnictwa
Tematy:
pluton
spektrometria alfa
spektrometria masowa
technika ciekłych scyntylatorów
plutonium
alpha spectrometry
mass spectrometry
liquid scintilation
Źródło:
Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa; 2004, 1; 104-104
1643-7608
Pojawia się w:
Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quercetin: health benefits with relevance to TNF-alpha-linked inflammatory diseases
Autorzy:
Harrison, A.P.
Cooper, R.G.
Powiązania:
https://bibliotekanauki.pl/articles/3012.pdf
Data publikacji:
2008
Wydawca:
Instytut Medycyny Wsi
Tematy:
quercetin
health benefit
tumour necrosis factor-alpha
human disease
inflammatory disease
flavonoids
fruit
human health
Źródło:
Journal of Pre-Clinical and Clinical Research; 2008, 02, 2
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of magnetic fields on the activity of enzymes: alpha- and beta-amylase and glutathione S-transferase [GST] in wheat plants
Autorzy:
Rochalska, M.
Grabowska, K.
Powiązania:
https://bibliotekanauki.pl/articles/25053.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
wheat plant
magnetic field
glutathione S-transferase
beta-amylase
enzyme
alpha-amylase
magnetic biostimulation
germination
Źródło:
International Agrophysics; 2007, 21, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dietary supplementation with phytohemagglutinin in combination with alpha-ketoglutarate limits the excretion of nitrogen via urinary tract
Autorzy:
Filip, R
Wdowiak, L.
Harrison, A.P.
Pierzynowski, S.G.
Powiązania:
https://bibliotekanauki.pl/articles/51877.pdf
Data publikacji:
2008
Wydawca:
Instytut Medycyny Wsi
Tematy:
excretion
urinary tract
nitrogen elimination
dietary supplementation
rat
gastrointestinal tract
phytohemagglutinin
alpha-ketoglutaric acid
Źródło:
Annals of Agricultural and Environmental Medicine; 2008, 15, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A GIS-based Fuzzy Multi-Criteria Analysis Approach to Industrial Site Selection
Autorzy:
Buchynska, Iryna
Powiązania:
https://bibliotekanauki.pl/articles/411084.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
geographic information systems
multiple-criteria decision analysis
fuzzy set theory
alpha-cut
site selection
Opis:
The paper proposes a methodology for fuzzy multi-criteria analysis of decisions in a raster-based geographical information system (GIS) to determine the optimal locations for territorial objects. Recommendations about the stages of choosing alternatives for spatial and non-spatial constraints are given. It is shown that the fuzzyfication of criteria, that is, the conversion of their attribute values into a fuzzy set, based on expert evaluation of a fuzzy membership function, allows screening alternatives by determining thresholds of alpha-cut of fuzzy sets for each criterion, followed by combining criteria attributes using aggregation operators: minimum, maximum, weighted sum, OWA operator Jager. Adding to the procedure of multicriteria analysis of the additional stage of filtration of alternatives gives the opportunity to reduce the number of alternatives, and in the future and the processing time of the criteria layers by aggregator operators. The proposed algorithm for screening alternatives can be performed in a GIS environment using Fuzzy Membership, Overlay and raster calculators tools.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2019, 8, 3; 17-22
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena aktywności α-amylazy w ziarnie odmian kukurydzy zwyczajnej (Zea mays L.) w aspekcie ich wykorzystania do produkcji bioetanolu
Analysis of α-amylase activity in grain of maize (Zea mays L.) cultivars in respect of their application to bioethanol production
Autorzy:
Pol-Szyszko, Magdalena
Masojč, Piotr
Doniec, Izabela
Wenda, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/42925078.pdf
Data publikacji:
2009
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
alfa-amylaza
liczba opadania
bioetanol
kukurydza zwyczajna
Zea mays
alpha-amylase
falling number
bioethanol
Opis:
Wzrastające zanieczyszczenie środowiska naturalnego, postępujący deficyt surowców kopalnianych oraz rosnące koszty pozyskiwania paliw konwencjonalnych spowodowały poszukiwanie alternatywnych źródeł energii. Celem pracy było wskazanie odmian kukurydzy zwyczajnej przydatnych do produkcji bioetanolu ze względu na wysoką aktywność amylolityczną ziarna. Aktywność α- amylazy oceniono metodą dyfuzji w żelu agarozowym i na podstawie liczby opadania według metodyki Hagberga-Pertena. Aktywność α- amylazy wahała się w granicach od 0,11 U·ml-1 (Prosna) do 15,45 U·ml-1 (Król) a liczba opadania od 61,0 s (Wilga) do 365,5 s (Blask). Najwyższą aktywność α- amylazy i niską liczbę opadania wykazały odmiany Wigo, Wilga, Cyrkon, Kosmo 230, Boruta, Kasia, Nimba, Iman, Król i Nysa. Ze względu na dużą zawartość endogennej alfa-amylazy, odmiany te mogą okazać się przydatne do produkcji bioetanolu.
Rising pollution of the environment, progressive shortage of natural resources, and rising costs of getting conventional fuel caused a search for alternative energy sources. The aim of the paper was to indicate the varieties of corn useful in production of bioethanol for the sake of high amylolythic activity of the grain. The activity of alpha-amylase was estimated with the method of diffusion in agarose gel and on the basis of the falling number according to the Hagberg-Perten’s methodology. The activity of alpha-amylase varied between 0,11 (Prosna) to 15,45 U·ml-1 (Król), and the falling number between 61.0 s (Wilga) and 365.5 s (Blask). The highest activity of alpha-amylase and low falling number showed the varieties Wigo, Wilga, Cyrkon, Kosmo 230, Boruta, Kasia, Nimba, Iman, Król and Nysa. Because of high content of endogenous alpha-amylase these varieties can turn out to be useful in production of bioethanol.
Źródło:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin; 2009, 254; 75-81
0373-7837
2657-8913
Pojawia się w:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of alpha-chymotrypsin inhibitor from Ascaris lumbricoides suum on chick embryos
Autorzy:
Blaszkowska, J
Powiązania:
https://bibliotekanauki.pl/articles/838045.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
parasite
pathological change
alpha-chymotrypsin
Ascaris lumbricoides suum
mortality
host organism
Leghorn breed
inhibitor
chicken
embryo
Opis:
It has been found that alpha-chymotrypsin inhibitor isolated from Ascaris lumbricoides suum acts embryotoxically on the Leghorn chicken embryo. An increase in embryo mortality with increasing dose of the inhibitor has been observed after its administration into the yolk sac on day 4, 8 or 13 of incubation. There is a linear interrelationship between the logarithm of the dose of alpha-chymotrypsin inhibitor and the mortality of chickens. The LD50 values foralpha-chymotrypsin inhibitor increased for injections performed at later stages of embryo development. A significant decrease of mean mass of chicks injected with alpha-chymotrypsin inhibitor in comparison with control groups was observed. There was a more frequent occurrence of developmental abnormalities and pathological changes in groups of hatched chicks which received the Ascaris inhibitor.
Źródło:
Annals of Parasitology; 1998, 44, 1
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of in vitro culture conditions for obtaining flax (Linum usitatissimum L. cv. Modran) cell suspension culture
Autorzy:
Seta-Koselska, A.
Skorzynska-Polit, E.
Powiązania:
https://bibliotekanauki.pl/articles/81015.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Linum usitatissimum
flax
in vitro culture
alpha-linolenic acid
phytochemical
lignan
callus culture
cell suspension culture
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2017, 98, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An application of LSC method for the measurement of gross alpha and beta activities in spiked water and drinking water samples
Autorzy:
Çakal, G. Ö.
Güven, R.
Yücel, H.
Powiązania:
https://bibliotekanauki.pl/articles/146427.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
alpha activity
beta activity
drinking water
liquid scintillation counting (LSC)
pulse shape analysis (PSA) calibration
quench
Opis:
In this study, after the pulse shape calibration of a liquid scintillation counting (LSC) spectrometer (Quantulus 1220), the efficiency was determined depending on sample quenching parameters. Then, gross alpha and beta activities in two spiked water samples obtained from International Atomic Energy Agency (IAEA) were used for the validation of the ASTM D7283-06 method, which is a standard test method for alpha and beta activity in water by LSC. Later, the drinking water samples (35 tap water and 9 bottled water) obtained from different districts of Ankara, Turkey, were measured. The maximum gross alpha activities are measured to be 0.08 Bq/L for tap waters and 0.13 Bq/L for bottled waters, whereas the maximum gross beta activities are found to be 0.18 Bq/L for tap waters and 0.16 Bq/L for bottled waters. These results indicate that these drinking water samples are below the required limits, which are 0.1 Bq/L for alpha emitting radionuclides and 1 Bq/L for beta emitting radionuclides. As a result, gross alpha and beta activities in drinking water of Ankara were determined accurately by this validated LSC method. It is also worth noting that LSC is a rapid and accurate method for the determination of gross alpha and beta activities without requiring a tedious sample preparation.
Źródło:
Nukleonika; 2015, 60, No. 3, part 2; 637-642
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anti-pathogenic properties of plant peptide hormone phytosulfokines [PSKs] and its selected analogues
Autorzy:
Bahyrycz, A.
Saniewska, A.
Konopinska, D.
Powiązania:
https://bibliotekanauki.pl/articles/55358.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
antipathogenic property
Botrytis tulipae
antifungal activity
Phoma narcissi
phytosulphokine-alpha
plant peptide hormone
phytosulphokine-beta analogue
Opis:

Phytosulfokine-α (PSK-α) (H-Tyr(SO3H)-Ile-Tyr(SO3H)-Thr-Gln- OH) (I), a sulfated growth factor universally found in both monocotyledons and dicotyledons, strongly promotes proliferation of plant cells in culture. The C-terminal truncated analog named PSK-β (Tyr(SO3H)-Ile-Tyr(SO3H)-Thr) (II) showed a 10-fold lower activity than that of the parent pentapeptide. Because PSK-α promotes proliferation and differentiation during the plant growth we undertook the studies on the influence of PSK-α on plant defense mechanisms in that period. In present studies on PSK-α (I), PSK-β (II), and its analogues, we performed a search of another biological properties. The aim of our investigation was evaluation of PSK-α, PSK-β and their selected analogues in relation to growth and development of plant pathogens, such as Phoma narcissi and Botrytis tulipae. In these studies we elaborated the synthesis of PSK-α or PSK-β and their 22 analogues modified by natural and non-natural amino acid residues. Peptides were synthesized by the solid phase method according to the Fmoc procedure on a Wang-resin. Free peptides were released from the resin by 95% TFA in the presence of EDT. Biological effect of these peptides was evaluated by test on the growth and development of pathogens of P. narcissi and B. tulipae.

Źródło:
Pestycydy; 2008, 1-2; 109-117
0208-8703
Pojawia się w:
Pestycydy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The expression profile of galactinol synthase genes (VhGolS1 and VhGolS2) in developing Vicia hirsuta ([L.] S.F. Gray) seeds
Autorzy:
Podlinski, P.
Gojlo, E.
Pupel, P.
Jastrzebski, J.P.
Paukszto, L.
Gorecki, R.J.
Powiązania:
https://bibliotekanauki.pl/articles/80158.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
expression profile
galactinol synthase
alpha-D-galactoside
galactosyl cyclitol
Vicia hirsuta
seed
gene expression
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ nurkowania na PAI - 1 I ALFA2-antyplazminy oraz aktywność fibrynolityczna
Decreased levels of PAI-1 and alpha2-antiplasmin contribute to enhanced fibrynolitic activity in divers
Autorzy:
Radziwon, P.
Olszański, R.
Tomaszewski, R.
Lipska, A.
Dąbrowiecki, Z.
Korzeniewski, K.
Siermontowski, P.
Boczkowska-Radziwon, B
Powiązania:
https://bibliotekanauki.pl/articles/366342.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Medycyny i Techniki Hiperbarycznej
Tematy:
alfa2-antyplazmina
choroba dekompresyjna
PAI-1
PAP
t-PA
alpha2-antiplasmin
decompression sickness
Opis:
Praca mówi o nie zbadanych dotychczas dokładnie powiązaniach choroby dekompresyjnej z zagadnieniami hemostazy a szczególnie fibrynolizy. Badany był wpływ ekspozycji hiperbarycznej na główne składniki systemu fibrynolizy. Dwie grupy młodych mężczyzn poddawane były ekspozycjom hierbarycznym do ciśnienia 400 kPa - grupa I - i 700 kPa - grupa II. Stosowano dekompresję powietrzna. Po ekspozycji badano nurków na obecność objawów choroby dekompresyjnej, a także poszukiwano pęcherzyków gazu w naczyniach żylnych metoda Dopplera. 15 minut po zakończeniu dekompresji pobierano krew do badań koagulologicznych. Badano stężenie i aktywność t-PA i PAI-1, stężenie PAP i alfa2-antyplazminy. W grupach badawczych nie stwierdzono wykładników choroby dekompresyjnej ani nadmiernej ilości pęcherzyków wewnątrznaczyniowych. Stwierdzono miedzy innymi spadek poziomu alfa2-antyplazminy, spadek stężenia i aktywności PAI-1. Nie zaobserwowano zmian w zakresie czynnika XII jak i t-PA. Ekspozycja hiperbaryczna i dekompresja indukuje fibrynolize, nawet bez obecności pęcherzyków gazowych.
There are a number of reported cases of decompression sickness (DCS) with haemorrhages. These cases have not been sufficiently investigated and thus bleeding complications could not be directly correlated to the enhanced fibrinolysis. The effect of hyperbaric exposition and decompression on the main components of fibrynolitic system have been measured. Two groups of 25 male divers each, were subjected to hyperbaric exposures to the pressure of either 400 kPa - group I - or 700 kPa - group II followed by a staged decompression. The divers were monitored for clinical symptoms of DCS and checked for Doppler-detected venous gas bubbles. Venous blood was drawn from divers before exposition and 15 minutes after decompression. The concentrations and activities of t-PA and PAI-1 as well as concentrations of PAP and alpha2-antiplasmin and activity of factor XIIa were measured. In all groups of divers no cases of DCS as well as detectable gas bubbles were noted. We observed elevated concentration of PAP, decreased concentration of alpha2-AP, decreased PAI-1 concentration and activity. There were no significant changes in factor XIIa activity as well a of t- PA concentration and activity. Hyperbaric exposition and decompression induce activation of fibrynolisis, even in the absence of detectable gas bubbles. Fibrynolitic activity increases mainly due to decrease of PAI-1 concentration and activity. Further clinical trials are necessary for the estimation of the importance of activation of fibrynolisis with decreased level of PAI-1 and alpha2-AP as possible risk factor for bleeding in divers.
Źródło:
Polish Hyperbaric Research; 2007, 3(20); 33-42
1734-7009
2084-0535
Pojawia się w:
Polish Hyperbaric Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new generalization of the Pareto distribution and its applications
Autorzy:
Almetwally, Ehab M.
Ahmad, Hanan A. Haj
Powiązania:
https://bibliotekanauki.pl/articles/1059040.pdf
Data publikacji:
2020-12-04
Wydawca:
Główny Urząd Statystyczny
Tematy:
Marshall-Olkin distribution
alpha power transformation
maximum likelihood estimator
maximum product spacings
bayes estimation
simulation
Opis:
This paper introduces a new generalization of the Pareto distribution using the Marshall Olkin generator and the method of alpha power transformation. This new model has several desirable properties appropriate for modelling right skewed data. The Authors demonstrate how the hazard rate function and moments are obtained. Moreover, an estimation for the new model parameters is provided, through the application of the maximum likelihood and maximum product spacings methods, as well as the Bayesian estimation. Approximate confidence intervals are obtained by means of an asymptotic property of the maximum likelihood and maximum product spacings methods, while the Bayes credible intervals are found by using the Monte Carlo Markov Chain method under different loss functions. A simulation analysis is conducted to compare the estimation methods. Finally, the application of the proposed new distribution to three real-data examples is presented and its goodness-of-fit is demonstrated. In addition, comparisons to other models are made in order to prove the efficiency of the distribution in question.
Źródło:
Statistics in Transition new series; 2020, 21, 5; 61-84
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obciążenie estymatora współczynnik alfa Jensena a interpretacje parametrów klasycznych modeli market-timing
The Influence of the Bias of the Jensens Alpha Coefficient Estimator on Interpreting the Parameters of the Classical Market-Timing Models
Autorzy:
Olbryś, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/1830763.pdf
Data publikacji:
2011-06-30
Wydawca:
Główny Urząd Statystyczny
Tematy:
alfa Jensena
selektywność
modele market-timing
Jensen’s alpha coefficient
selectivity
classical market-timing models
Opis:
W 1968 roku ukazał się w „The Journal of Finance” artykuł M.C. Jensena The performance of mutual funds in the period 1945 – 1964, w którym m.in. wprowadzony został współczynnik α, zwany w literaturze przedmiotu alfą Jensena, jako miara umiejętności zarządzającego portfelem inwestycyjnym w zakresie selektywności aktywów. Wnioski Jensena odnośnie interpretacji można podsumować następującym stwierdzeniem: estymator ˆα może być dodatni z dwóch powodów: 1) dodatkowych zysków osiąganych przez menadżera wykorzystującego swoje umiejętności w zakresie doboru aktywów; 2) dodatniego obciążenia estymatora parametru α. W roku 1977, również w „The Journal of Finance, ukazał się z kolei artykuł D. Granta Portfolio performance and the „cost” of timing decisions, w którym Autor podważa prawdziwość wzoru przedstawionego przez Jensena pisząc wprost o błędzie matematycznym w przekształceniach. Prezentuje własne wyprowadzenie wzoru i podaje nową interpretację, według której estymator współczynnika alfa jest obciążony ujemnie. Wprowadza to sporo zamieszania w literaturze przedmiotu, ponieważ część autorów powołuje się w swoich pracach na interpretację Jensena, natomiast część na interpretację Granta. W konsekwencji wnioski dotyczące wyników badań empirycznych na rynkach funduszy inwestycyjnych, w zakresie umiejętności stosowania przez zarządzających funduszami technik market-timing oraz selektywności aktywów, nie są jednoznaczne. Głównym punktem artykułu jest wyprowadzenie spornego wzoru, w celu wyciągnięcia ostatecznych wniosków dotyczących statystycznego oddziaływania obciążenia estymatora współczynnika alfa Jensena na pozostałe parametry modelu regresji. Dodatkowo przedstawione zostaną przykłady klasycznych modeli market-timing polskich funduszy inwestycyjnych akcji, jak również zostanie zbadana stabilność parametrów otrzymanych modeli ekonometrycznych w okresie styczeń 2003 – grudzień 2010.
Jensen’s alpha coefficient was introduced in 1968 as a measure of the manager’s ability to forecast future security prices (M.C. Jensen, The performance of mutual funds in the period 1945 – 1964, „The Journal of Finance”). The paper concluded that the performance measure ? may be positive for two reasons: 1) extra returns earned on the portfolio due to the manager’s ability and/or 2) a positive â estimator bias. In 1977, D.Grant (Portfolio performance and the „cost” of timing decisions, „The Journal of Finance”) stated that Jensen’s original work contained a mathematical error and a conceptual problem. He propounded a new equation which differed from that of Jensen in both direction and magnitude of the â estimator bias. Grant’s new approach caused serious confusion about the subject as some authors now quote after Jensen and some after Grant. Consequently, the conclusions concerning managed mutual funds’ portfolios performance are often ambiguous. The aim of this paper is to resolve this ambiguity and to determine which alpha coefficient interpretation is correct. The paper contains a proof of Jensen’s equation. We also present the examples of the classical T-M and H-M market-timing models in the case of Polish equity open-end mutual funds and test their stability in the period Jan 2003-Dec 2010.
Źródło:
Przegląd Statystyczny; 2011, 58, 1-2; 42-59
0033-2372
Pojawia się w:
Przegląd Statystyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interaction between larval alpha-amylase of the tomato leaf miner, Tuta absoluta Meyrick (Lepidoptera: Gelechiidae) and proteinaceous extracts from plant seeds
Autorzy:
Esmaeily, M.
Bandani, A.R.
Powiązania:
https://bibliotekanauki.pl/articles/65574.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
interaction
larva
alpha-amylase
tomato leafminer
Tuta absoluta
Lepidoptera
Gelechiidae
plant extract
seed
plant seed
Opis:
The tomato leaf miner, Tuta absoluta Meyrick (Lepidoptera: Gelechiidae), is one of the most destructive pest of solanaceae and it prefers tomato (Solanum lycopersicum L.). The aim of the current study was to investigate the effects of a wide range of seed proteinaceous extracts from different plant families against T. absoluta α-amylase activity. The effect of pH on the inhibitory activity of seed extracts showed that seed extracts of amaranth along with a wheat cultivar (Alvand, Aflak, Sarvdasht, Alborz, and Kavir) produced more than a 50% inhibition of the insect amylase. Aflak wheat seed extract at 10 μg, inhibited 81% of the insect amylase. This percent was the highest inhibition achieved. The other proteinaceous seed extracts had a lower effect on the enzymatic activity. Probit analysis showed that Aflak, Kavir, Alborz, Alvand, Sarvdasht, and amaranth inhibited the amylase activity with an I50 of 1.94, 3.24, 3.46, 3.31, 4.97, and 15.39 μg, respectively. The effect of pH on the inhibition of the α-amylase showed the highest inhibition of Amaranth and wheat, at a pH value of 8.0, which corresponds to the pH of the insect’s gut. Gel electrophoresis assays confirmed the spectrophotometric assays showing that the α-amylase of the insect gut was affected by the presence of the seed extracts. In the gel assay, a high concentration (14 μg protein) of amaranth proteinaceous seed extract greatly decreased the intensity of the α-amylase band. A high concentration of the Aflak wheat cultivar (10 μg protein) caused the disappearance of the amylase band in the gel. Thus, it is concluded that the physiochemical environment of the insect gut affects the interaction between digestive α-amylase and the metabolites. The experiments showed that seed proteinaceous extracts from non-host plant species, produced more inhibition of the insect amylase when compared to the host plant species. It appears that with evolution, adaptation took place so that insect/s could overcome the plant metabolites.
Źródło:
Journal of Plant Protection Research; 2015, 55, 3
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Political Processes and the War in Ukraine on the Formation of Generation Alpha and the iGeneration (Z): Defining Specific Features
Влияние политических процессов и войны на Украине на формирование поколений Альфа и iGeneration (Z): определение особенностей
Autorzy:
Kryvachuk, Liudmyla
Powiązania:
https://bibliotekanauki.pl/articles/2053362.pdf
Data publikacji:
2022-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
Ukraine
political processes
hybrid war
Russian-Ukrainian war
social
policy
social problems
children
young
generation
iGeneration (Z)
generation Alpha
Украина
политические процессы
гибридная война
российско-украинская война
социальная политика
социальные проблемы
дети
молодёжь
поколение
generation Alpha.
Opis:
The article attempts to analyse and define the specific features of the iGeneration (Z) and Generation Alpha in Ukraine in the context of the political processes and the war taking place in Ukrainian society. The article discusses the generation issues, taking into account the characteristics of the iGeneration (Z) and Generation Alpha. Assuming that a generation is an identifiable group of people who share a similar time of birth and significant events at critical stages of development, the article presents an original approach to determining the specific features of the iGeneration (Z) and Generation Alpha in Ukraine. The Orange Revolution (2004), the Revolution of Dignity (2014) and the hybrid war (2014-2022) and Russian-Ukrainian war (from 24.02.2022) had a significant impact on the formation of the iGeneration (Z) and Generation Alpha in Ukraine.
В статье представлены анализ и определение специфики поколений iGeneration (Z) и Generation Alpha в контексте политических и социальных процессов в украинском обществе. А также влияния гибридной войны (2014-2022) и российско-украинской войны (2022) на формирование поколений iGeneration (Z) и Generation Alpha в Украине. В статье рассматриваются вопросы формирования поколений с учетом особенностей iGeneration (Z) и Generation Alpha, поколение рассматривается как группа людей, которую объединяет время рождения и значимые события на критических этапах его развития и формирования. В статье представлен оригинальный авторский подход к определению специфики поколений iGeneration (Z) и Generation Alpha в Украине. Показано, что существенное влияние на формирование поколений iGeneration (Z) и Generation Alpha в Украине оказали Оранжевая революция (2004), Революция Достоинства (2014), гибридная война (2014-2022) и российско-украинская война (2022).
Źródło:
Nowa Polityka Wschodnia; 2022, 2(33); 66-89
2084-3291
Pojawia się w:
Nowa Polityka Wschodnia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Content of saccharides and activity of alpha-glycosidases in Galleria mellonella larvae infected with entomopathogenic nematodes Heterorhabditis zealandica
Autorzy:
Zoltowska, K.
Powiązania:
https://bibliotekanauki.pl/articles/841107.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
Galleria mellonella
alpha-glycosidase
saccharide
content
Heterorhabditis zealandica
enzyme activity
nematode
parasitic infection
larva
entomopathogenic nematode
glycosidase
Źródło:
Annals of Parasitology; 2004, 50, 3
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł

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