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Tytuł:
Method for determination of potato starch reducing properties
Metoda oznaczania właściwości redukcyjnych skrobi ziemniaczanej
Autorzy:
Golachowski, A.
Leszczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/1396403.pdf
Data publikacji:
1985
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
starch
reducing power
reducing end-groups
dissolution in water
Opis:
The method for determination of the starch reducing power after dissolution in water at 121°C and for determination of the quanti ty of reducing end-groups by the Park and Johnson ferricyanide modified method, was elaborated.
Większość metod oznaczania właściwości redukcyjnych skrobi polega na jej rozpuszczeniu w roztworze wodorotlenku i określeniu ilości końcowych grup aldehydowych w łańcuchach skrobiowych jako substancji redukujących. Wyniki redukcyjności skrobi uzyskiwane tymi metodami są na ogół wyższe niż wynikałoby to z masy molowej skrobi oznaczonej metodami fizycznymi. Powodowane jest to procesami częściowej degradacji skrobi i powstawania różnych związków redukujących, zachodzącymi przypuszczalnie podczas wykonywania oznaczenia. Celem pracy było znalezienie warunków oznaczania redukcyjności skrobi zapewniających możliwie małą jej degradację. W opracowanej metodzie skrobię rozpuszczano w wodzie w podwyższonej temperaturze i ciśnieniu, a substancje redukujące oznaczano zmodyfikowaną metodą Parka i Johnsona. Otrzymane wyniki porównywano z rezultatami oznaczeń wykonanych metodą z kwasem 3,5-dwunitrosalicylowym. Wartości redukcyjności skrobi uzyskane przy zastosowaniu opracowanej metody były istotnie niższe od wyników oznaczeń metodą z kwasem dwunitrosalicylowym. Opracowana metoda jest powtarzalna, prosta i szybka w wykonaniu.
Źródło:
Acta Alimentaria Polonica; 1985, 11, 1; 125-132
0137-1495
Pojawia się w:
Acta Alimentaria Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanisms of Microbiological Corrosion Employing Iron-Reducing Bacteria
Autorzy:
Jamaluddin, Nur Ain Atiqah
Yusoff, Mahani
Wee, Seng Kew
Masri, Mohamad Najmi
Powiązania:
https://bibliotekanauki.pl/articles/2174587.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microbiological corrosion
iron-reducing bacteria
Opis:
Iron-reducing bacteria (IRB) seek to unravel iron corrosion for oil and gas steel pipeline failure. IRB continued to be dominating the microbiological corrosion of iron structures in steel by deteriorating steel surface via Fe(III) reduction. The mechanisms by IRB mediate Fe(III) reduction into Fe(II) for bacterial respiration to contribute to iron steel corrosion. However, the complexity of corrosion is not fully comprehended. It remains controversial due to the corrosion mechanisms proposed by IRB that may induce or inhibit corrosion when engaged with microbial biofilm. In this brief review, understanding microbiological corrosion mechanisms associated with IRB interactions may better understand microbiological corrosion and derive corrosion control.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1355--1358
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The possibilities of using sulphate-reducing bacteria for phenol degradation
Autorzy:
Rudzanova, Dominika
Luptakova, Alena
Macingova, Eva
Powiązania:
https://bibliotekanauki.pl/articles/110820.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
adaptation
biodegradation
phenol
sulphate-reducing bacteria
Opis:
Steel production processes generate the coke wastewaters contaminated predominantly by highly toxic phenol. Numbers of physical, chemical and physicochemical methods have been developed for the removal of phenol from coke wastewaters. Biological methods are eco-friendly and present appropriate alternative of conventional processes. Various microorganisms are able to degrade phenolic compounds including sulphate-reducing bacteria (SRB). In this work, we study the adaptation of SRB isolated from natural source to phenol and consequently the application of the adapted bacterial cultures for the biodegradation of phenol from model solutions. Two types of bacterial culture were used (monoculture containing SRB genera Desulfovibrio and mixed bacterial consortium containing SRB genera Desulfovibrio). In experiments the modified Postgate’s medium C was used - sodium lactate as the original energy and carbon source was replaced by phenol with concentration 10 mg/dm3 for adaptation and 50 mg/dm3 for biodegradation. The mixed bacterial consortium has been shown as more capable to be adapted and grow on phenol and it has the better potential for phenol biodegradation as the bacterial monoculture of SRB genera Desulfovibrio.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1148-1155
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania nad zmniejszeniem emisji CO i HC podczas rozruchu silnika o ZS w obniżonej temperaturze otoczenia
Researches on the redction of CO and HC emissions during start-up diesel engine at low ambient temperatures
Autorzy:
Koliński, K.
Powiązania:
https://bibliotekanauki.pl/articles/250196.pdf
Data publikacji:
2013
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
silnik Diesla
zmniejszenie emisji CO
zmniejszenie emisji HC
Diesel engine
reducing CO emission
reducing HC emission
Opis:
W artykule przedstawiono wyniki badań katalitycznego ograniczenia emisji tlenku węgla i weglowodorów podczas rozruchu silnika o ZS. Badania przeprowadzono na stanowisku w komorze klimatycznej w obniżonych temperaturach otoczenia: -7, -15 i -20°C. W badaniach zastosowano podgrzewany trójfunkcyjny reaktor katalityczny platynowo-palladowy z monolitem metalowym. Metodyka prowadzonych badań polegała na pomiarze stężenia toksycznych składników spalin przed i za z reaktorem katalitycznym przy jednoczesnym pomiarze parametrów rozruchu i pomiarze temperatur w wybranych miejscach silnika oraz reaktora katalitycznego. Emisję tlenku węgla i węglowodorów w okresie rozruchu ograniczono poprzez wstępne podgrzanie reaktora katalitycznego przed rozruchem za pomocą grzejnika elektrycznego. Przy podgrzaniu powierzchni reaktora do 400oC uzyskuje się w temperaturze otoczenia -7°C średnie obniżenie stężenia CO o 80...90%, natomiast węglowodorów o ok. 70%.
This article presents the results of the tests of catalytic reduction of carbon oxide and hydrocarbon emission during the self-ignition engine start-up. The tests were performed at the station in the climate chamber at lowered ambient temperatures: -7,-15 and -20°C. A heated three-function platinumpalladium catalytic reactor with a metal monolith was used in the tests. The test methodology included a measurement of toxic fume concentraction upstream and downstream the catalytic reactor at simultaneous measurement of the start-up parameters and measurement of temperatures in selected engine and catalytic reactor locations. Carbon oxide and hydrocarbon emission during the start-up period can be reduced by initial heating up the catalytic reactor before the start-up by means of an electric heater. When heating up the reactor surface up to 400oC at ambient temperature of -7°C, CO concentration can be reduced by 80...90% and the hydrocarbon concentration can be reduced by app. 70% on the average.
Źródło:
TTS Technika Transportu Szynowego; 2013, 10; 765-774, CD
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fossil bacteria in Cenomanian–Turonian phosphate nodules and coprolites, Bohemian Cretaceous Basin, Czech Republic
Autorzy:
Al-Bassam, K.
Halodová, P.
Powiązania:
https://bibliotekanauki.pl/articles/191836.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
sulphur-reducing bacteria
cyanobacteria
phosphogenesis
apatite
Cretaceous
Opis:
Phosphatized biomorphs, resembling modern and ancient bacteria, were identified for the first time in phosphate nodules, present at the base of the Bílá Hora Formation (uppermost Cenomanian - lower Turonian), and in phosphate coprolites at the base of the Teplice Formation (upper Turonian) in the Bohemian Cretaceous Basin. They are present in colonies as filaments, coccoids, strings, rods and outgrowths, associated with the phosphate as part of the rock constituents and display the characteristics of fossilized bacteria. Two types of bacteria were identified: chemotrophic, sulphur-reducing bacteria in the phosphate nodules and phototrophic cyanobacteria in the phosphate coprolites. Microanalysis of some of the fossil bacteria revealed a fluoride-rich calcium phosphate composition, compatible with the composition of bulk samples, in which carbonate-fluorapatite is the main mineral in the phosphate nodules and coprolites. The environmental indications of these fossil bacteria support the interpretation of an anoxic environment of phosphogenesis in the latest Cenomanian - earliest Turonian and variable redox conditions of coprolite phosphatization in the late Turonian. The potential microbial role in phosphogenesis in the former may have involved the suboxic breakdown of P-rich organic matter by sulphur-reducing bacteria and the release of phosphorus in the pore water, leading to the biochemical precipitation of phosphate. The latter involved initial P-storage by phototrophic bacteria in an oxic environment, followed by P-release below the sediment-water interface under suboxic conditions and subsequent phosphatization of the coprolites.
Źródło:
Annales Societatis Geologorum Poloniae; 2018, 88, 3; 257-272
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Side lobes reducing by variation of array apperture edge shape
Autorzy:
Gorobets, N.N.
Gorobets, Yu.N.
Kiyko, V.I.
Powiązania:
https://bibliotekanauki.pl/articles/308797.pdf
Data publikacji:
2000
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
phone antenna arrays
side lobes level reducing
Opis:
A possibility of side lobes level reducing in plane antenna array by creation of aperture comb edge in arrays with rectangular and circular aperture shape together with usage of different types of reducing to the array edges amplitude distributions is investigated by computer analysis. It is shown that usage of the comb structure in combination with the reducing amplitude distribution enables one to reach the side lobes level reducing in the array to -27 ÷ -29 dB.
Źródło:
Journal of Telecommunications and Information Technology; 2000, 1-2; 85-89
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase change of chlorite in reducing atmosphere
Autorzy:
Liu, X.
Yu, Y.
Chen, W.
Powiązania:
https://bibliotekanauki.pl/articles/110704.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
chlorite
phase change
magnetizing
reducing roasting
magnetite
Opis:
Magnetizing roasting is an important pre-treatment technique for beneficiation of hematite and limonite ores. Reduction mechanisms of these iron minerals have been fully studied while the mechanism of reduction of chlorite is not well understood. In this study, a reduction roasting study examining the phase change of chlorite with roasting temperature was undertaken. The major finding from this study was that chlorite partially was reduced to magnetite by carbon at 750 ⁰C, and the newly formed magnetite was finely disseminated within quartz and olivine. It was demonstrated that these locked magnetite particles would be reported to iron concentrate by low intensity magnetic separation resulting in high impurity content, especially SiO2 and Al2O3 contents in the concentrate.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 2; 607-614
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bilateral risk-reducing mastectomy – surgical procedure, complications and financial benefit
Autorzy:
Gierej, Piotr
Rajca, Bartosz
Górecki-Gomoła, Adam
Powiązania:
https://bibliotekanauki.pl/articles/1391543.pdf
Data publikacji:
2021
Wydawca:
Index Copernicus International
Tematy:
prophylactic mastectomy
risk-reducing mastectomy
breast reconstruction
Opis:
Risk-reducing mastectomy is a recognized prophylactic treatment for women at high and very high risk of breast cancer development in many countries. In surgical treatment, mastectomy with simultaneous reconstruction is preferred. The most common method is simultaneous reconstruction with the use of implants, but an equivalent method with a comparable or lower complication rate is simultaneous reconstruction with own tissues, taking into account free tissue flaps. The patient should be informed about the high risk of complications, possible deterioration of the life quality and high rate of corrective reoperations. In order for this form of the most effective and financially measurable health prophylaxis to be actually implemented, it is necessary to rationally evaluate the procedure and differentiate its costs depending on the type of reconstruction performed.
Źródło:
Polish Journal of Surgery; 2021, 93, 3; 48-54
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comprehensive circumscribing of non-linearity cases of a water supply system with smooth flow control
Autorzy:
Orłowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/241404.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
flow reducing valve
non-linearity of system
pressure reducing valve
steady flow
variable frequency drives
water supply system
Opis:
The descriptions found in the literature, of cases of even relatively strong non-linearity of the water supply systems, as well as their mathematical treatment, are rare and incomplete. They refer mainly to the non-linearity with respect to smooth flow control components (for instance, to the operation of pressure reducing valves (PRV), flow reducing valves (FRV) and pumps with motors equipped with smooth rotational speed control - variable frequency drives (VFD)). The article proposes a formally correct method of a comprehensive solution of the above non-linearity cases based on successive simulations with some dynamic analysis of the sensitivity of the system to the operation of the smooth control components mentioned. An appropriate algorithm controlling the effectiveness of the calculations secures correct description of the behaviour of the system for an arbitrary, in practice, method of control of flows, even if all the proposed smooth control methods are used simultaneously. The effects of the use of the solutions presented in mathematical modelling are illustrated by selected results of simulation carried out for an existing water supply system.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2006, 53, 1; 7-30
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mozliwosci ograniczenia zawartosci cukrow redukujacych w bulwach ziemniaka
Autorzy:
Zgorska, K
Frydecka-Mazurczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/835700.pdf
Data publikacji:
1994
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
ziemniaki
zawartosc cukrow redukujacych
bulwy
cukry redukujace
przetworstwo ziemniaka
potato
reducing sugar content
tuber
reducing sugar
potato processing
Źródło:
Ziemniak Polski; 1994, 2; 27-30
1425-4263
Pojawia się w:
Ziemniak Polski
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ARDRA studies of the ribosomal RNA operon within the Desulfovibrio desulfuricans strains
Autorzy:
Szczerba, Joanna
Bednarek, Ilona
Dzierżewicz, Zofia
Powiązania:
https://bibliotekanauki.pl/articles/1039689.pdf
Data publikacji:
2009
Wydawca:
Śląski Uniwersytet Medyczny w Katowicach
Tematy:
desulfovibrio desulfuricans
restriction enzymes
ribotyping
sulphate-reducing bacteria
Opis:
BACKGROUND Desulfovibrio desulfuricans belong to the heterogeneous group of anaerobic, sulphate-reducing bacteria (SRB), widely distributed in various environments. As a result of dissimilatory sulphate reduction, they release hydrogen sulphide (H2S), which has a cytotoxic effect in human and animal organisms. It has been shown by many authors, that Desulfovibrio was the genus predominating in patients with ulcerative colitis. Some of these bacteria can act as opportunistic pathogens associated with primary bacteremia and abdominal infections such as abscesses. MATERIAL AND METHODS Fifteen (soil and intestinal) strains of Desulfovibrio desulfuricans species were cultured in modified sulphate-free Postgate’s liquid medium with pyruvate for 10 days. Bacterial DNA was extracted by using a commercially available kit and DNA was used as a template for amplification of the full-length 16S, 23S rDNA and the intergenic spacer region. Digested with restriction enzymes (AluI, EcoRI, HaeIII, HindIII, HinfI, MboI and PstI) PCR amplicons were resolved by electrophoresis on 2% agarose gels. RESULTS Digestion of rrn operon of Desulfovibrio desulfuricans by seven restriction enzymes allowed to obtain the characteristic restriction profiles for all 15 investigated strains. The results allow us to suggest three of used enzymes: HinfI, AluI and HaeIII as a useful for confirmation of the similarity within of rrn operon of isolates belonging to this species. Considering the restriction profiles received with HindIII, and EcoR1 enzymes it seems that their application is insufficient, but PstI enzyme is not acceptable for the analysis of rrn operon of these bacteria. CONCLUSIONS The obtained data have shown that ARDRA can be used for establishment of phylogenetic relations among isolates of Desulfovibrio desulfuricans species, providing the appropriate restriction enzyme is used.
WSTĘP: Bakterie Desulfovibrio desulfuricans należą do szerokiej grupy beztlenowych bakterii redukujących siarczany (BRS), rozpowszechnionej w różnych środowiskach. Jako rezultat dysymilacyjnej redukcji siarczanów uwalniają do środowiska siarkowodór (H2S), który wpływa cytotoksycznie na organizm ludzi i zwierząt. Wielu autorów wykazało, iż rodzaj Desulfovibrio jest dominujący u osób cierpiących z powodu wrzodziejącego zapalenia okrężnicy. Ponadto niektóre gatunki tego rodzaju odgrywają role oportunistycznych patogenów wywołując bakteriemię, infekcje w obrębie jamy brzusznej oraz wrzody. MATERIAŁY I METODY: Piętnaście szczepów Desulfovibrio desulfuricans (glebowych i jelitowych) hodowanych było na modyfikowanym podłożu Postgata z dodatkiem pirogronianu przez 10 dni. Po wyizolowaniu genomowego DNA tych bakterii przeprowadzono reakcje PCR w celu namnożenia fragmentu operonu rrn obejmującego geny 16S, 23S oraz odcinek zmienny pomiędzy nimi. Otrzymane amplikony poddane zostały trawieniu enzymami restrykcyjnymi (AluI, EcoRI, HaeIII, HindIII, HinfI, MboI and PstI), a otrzymane fragmenty rozdzielono w 2% żelu agarozowym. REZULTATY: Przeprowadzona analiza restrykcyjna operonu rrn bakterii Desulfovibrio desulfuricans pozwoliła na otrzymanie charakterystycznych profili restrykcyjnych dla wszystkich piętnastu badanych szczepów. Uzyskane rezultaty pozwoliły uznać trzy z zastosowanych enzymów (HinfI, AluI oraz HaeIII) za odpowiednie do potwierdzenia podobieństw w obrębie operonu rrn bakterii tego gatunku. Biorąc pod uwagę profile otrzymane po trawieniu enzymami HindIII, EcoR1, możemy stwierdzić ich małą użyteczność w analizach operonu rrn gatunku Desulfovibrio desulfuricans, zaś enzym PstI w ogóle nie nadaje się do tego celu.
Źródło:
Annales Academiae Medicae Silesiensis; 2009, 63, 1; 7-13
1734-025X
Pojawia się w:
Annales Academiae Medicae Silesiensis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical composition of edible potato tubers in retail outlets in east-central Poland
Autorzy:
Zarzecka, K.
Gugała, M.
Mystkowska, I.
Zarzecka, M.
Powiązania:
https://bibliotekanauki.pl/articles/124548.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
potato
vitamin C
reducing sugars
sucrose
total protein
Opis:
The work was an attempt to determine and describe certain quality characteristics of edible potato on sale in Siedlce and Międzyrzec Podlaski. Potato tubers for examination were purchased in 3 kinds of retail outlets (ten shops of each kind) in east-central Poland. A total of 90 samples were collected to determine tuber size, protein and vitamin C content, reducing sugars and sucrose content. Potatoes purchased in all kinds of outlets met the standards set for tuber size. Potatoes bought in supermarkets had a better chemical composition than tubers purchased in groceries or fruit and vegetable shops. All the potato tubers were a good staple.
Źródło:
Journal of Ecological Engineering; 2015, 16, 1; 57-61
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Empirical methods of reducing the observations in geodetic networks
Autorzy:
Kadaj, R.
Powiązania:
https://bibliotekanauki.pl/articles/145336.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
odwzorowanie kartograficzne
obserwacja geodezyjna
mapowanie
cartographic mapping
reducing of geodetic observations
empirical methods of reducing observations
mapping of long geodesics
Opis:
The paper presents empirical methodology of reducing various kinds of observations in geodetic network. A special case of reducing the observation concerns cartographic mapping. For numerical illustration and comparison of methods an application of the conformal Gauss-Krüger mapping was used. Empirical methods are an alternative to the classic differential and multi-stages methods. Numerical benefits concern in particular very long geodesics, created for example by GNSS vectors. In conventional methods the numerical errors of reduction values are significantly dependent on the length of the geodesic. The proposed empirical methods do not have this unfavorable characteristics. Reduction value is determined as a difference (or especially scaled difference) of the corresponding measures of geometric elements (distances, angles), wherein these measures are approximated independently in two spaces based on the known and corresponding approximate coordinates of the network points. Since in the iterative process of the network adjustment, coordinates of the points are systematically improved, approximated reductions also converge to certain optimal values.
Źródło:
Geodesy and Cartography; 2016, 65, 1; 13-40
2080-6736
2300-2581
Pojawia się w:
Geodesy and Cartography
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production of ethanol from wheat straw
Autorzy:
Smuga-Kogut, M.
Wnuk, A. D.
Zgórska, K.
Kubiak, M. S.
Wojdalski, J.
Kupczyk, A.
Szlachta, J
Luberański, A.
Powiązania:
https://bibliotekanauki.pl/articles/778125.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
wheat straw
chemical processing
enzymatic hydrolysis
reducing sugars
ethanol
Opis:
This study proposes a method for the production of ethanol from wheat straw lignocellulose where the raw material is chemically processed before hydrolysis and fermentation. The usefulness of wheat straw delignification was evaluated with the use of a 4:1 mixture of 95% ethanol and 65% HNO3 (V). Chemically processed lignocellulose was subjected to enzymatic hydrolysis to produce reducing sugars, which were converted to ethanol in the process of alcoholic fermentation. Chemical processing damages the molecular structure of wheat straw, thus improving ethanol yield. The removal of lignin from straw improves fermentation by eliminating lignin’s negative influence on the growth and viability of yeast cells. Straw pretreatment facilitates enzymatic hydrolysis by increasing the content of reducing sugars and ethanol per g in comparison with untreated wheat straw.
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 3; 89-94
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Activity and kinetic properties of phosphotransacetylase from intestinal sulfate-reducing bacteria
Autorzy:
Kushkevych, Ivan
Powiązania:
https://bibliotekanauki.pl/articles/1039142.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
sulfate-reducing bacteria
phosphotransacetylase
kinetic analysis
inflammatory bowel diseases
Opis:
Phosphotransacetylase activity and the kinetic properties of the enzyme from intestinal sulfate-reducing bacteria Desulfovibrio piger and Desulfomicrobium sp. has never been well-characterized and has not been studied yet. In this paper, the specific activity of phosphotransacetylase and the kinetic properties of the enzyme in cell-free extracts of both D. piger Vib-7 and Desulfomicrobium sp. Rod-9 intestinal bacterial strains were presented at the first time. The microbiological, biochemical, biophysical and statistical methods in this work were used. The optimal temperature and pH for enzyme reaction was determined. Analysis of the kinetic properties of the studied enzyme was carried out. Initial (instantaneous) reaction velocity (V0), maximum amount of the product of reaction (Pmax), the reaction time (half saturation period, τ) and maximum velocity of the phosphotransacetylase reaction (Vmax) were defined. Michaelis constants (Km) of the enzyme reaction (3.36 ± 0.35 mM for D. piger Vib-7, 5.97 ± 0.62 mM for Desulfomicrobium sp. Rod-9) were calculated. The studies of the phosphotransacetylase in the process of dissimilatory sulfate reduction and kinetic properties of this enzyme in intestinal sulfate-reducing bacteria, their production of acetate in detail can be perspective for clarification of their etiological role in the development of the humans and animals bowel diseases. These studies might help in predicting the development of diseases of the gastrointestinal tract, by providing further details on the etiology of bowel diseases which are very important for the clinical diagnosis of these disease types.
Źródło:
Acta Biochimica Polonica; 2015, 62, 1; 103-108
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of simulator training to mitigate risks in Arctic shipping operations
Autorzy:
Røds, J. F.
Gudmestad, O. T.
Powiązania:
https://bibliotekanauki.pl/articles/949947.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
maritime education and training (MET)
simulator training
maritime simulator training
Arctic Shipping Operations
polar code
polar region
risk reducing
risk reducing measure
Opis:
Over the recent years, ship traffic in the polar areas has increased. There is reason to believe that this traffic, and especially the cruise traffic, will increase further as the ice retracts towards the poles. There is also reason to believe that with the continued focus and exposure of the Polar Region, the cruise tourism to the region will grow. The increased presence in the polar areas will create positive repercussions for several actors, both on sea and land. There will, however, also be challenges associated with the growing presence in the polar areas. Vessels will be operating at long distances to other vessels and land infrastructures. These vessels will also be operating in climate and conditions that will put extra pressure on both vessel and crew. These challenges need to be solved in order for the ship industry to operate safely in the Polar Region. To ensure that companies operating in these areas identify and manage these challenges, the International Maritime Organization (IMO) developed the Polar Code (2017) with the intent of increasing the safety for vessels operating in polar waters, and to reduce the impact on humans and environment in this remote, vulnerable and harsh area. This code defines a number of requirements, with which the vessels should operate in accordance with. In this paper, we reveal which challenges the vessel and its crew need to deal with when navigating in polar waters. The challenges will be analysed and assessed through the use of a preliminary qualitative risk analysis to determine the potential hazards the vessel is exposed to under operations in polar waters, and to find out what level of risk the different hazards represents for the vessel and its crew. The main objective of the paper is to find out how the risk levels can be reduced, with particular focus on the use of simulator training as a risk reducing measure. The final goal is to measure the risk towards acceptance criteria, which have been determined prior to conducting the analysis.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 2; 375-379
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of a molybdenum-reducing bacterium with the ability to degrade phenol, isolated in soils from Egypt
Autorzy:
Ibrahim, Y.
Abdel-Mongy, M.
Shukor, M.S.
Hussein, S.
Ling, A.P.K.
Shukor, M.Y.
Powiązania:
https://bibliotekanauki.pl/articles/80115.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
molybdenum
molybdenum-reducing bacteria
contaminated soil
bioremediation
nonylphenol
phenol
Egypt
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2015, 96, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wielkość erozji wodnej obliczona metodą USLE
Comparison of the water erosion magnitude estimated by the modified USLE methods
Autorzy:
Kowalczyk, A.
Twardy, S.
Powiązania:
https://bibliotekanauki.pl/articles/338170.pdf
Data publikacji:
2012
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
erozja
metody ograniczania erozji
methods for reducing erosion
soil erosion
Opis:
W pracy określono ilość erodowanej gleby metodą standardową, opracowaną przez Wischmeiera i Smitha, zmodyfikowaną przez Barriosa i zmodyfikowaną przez Jianguo Ma, na długości cieku głównego. Na podstawie wyników ze zlewni Bystrzycy Dusznickiej stwierdzono, że maksymalne natężenie erozji wodnej gleb występuje na terenach użytkowanych rolniczo. Wyniki uzyskane za pomocą omawianego modelu USLE (ang. "Universal soil loss equation") wg Barriosa różnią się o ok. 17% od uzyskanych z zastosowaniem pozostałych metod, co wynika ze sposobu obliczania współczynników L i S. Przeprowadzono również obliczenia, dotyczące wpływu zmian sposobu uprawy, z których wynika, że korzystniejsze jest wykonywanie zabiegów uprawnych (orki i innych) wzdłuż warstwic. Zmniejszyło to masę erodowanej gleby o 33% dla standardowej wersji modelu, a dla pozostałych metod o ok. 71%.
In this work the water erosion magnitude was estimated by the standard method developed by Wischmeier and Smith, modified by Barrios and Jianguo Ma on the length of the main watercourse. On the basis on the results for the Bystrzyca Dusznicka catchment it was found that the maximal intensity of the soil water erosion occurs in the agriculturally utilised land. The results obtained using the discussed USLE model (Universal soil loss equation) by Barrios differs from the values obtained using the other methods of about 17%. This is the result ofthe differences in methods for calculating the L and S coefficients. A simulation of changes of different kinds of land use has also been made. It was concluded that the most favourable is contour cultivation.
Źródło:
Woda-Środowisko-Obszary Wiejskie; 2012, 12, 1; 83-92
1642-8145
Pojawia się w:
Woda-Środowisko-Obszary Wiejskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis forming the diameter reduction of the tube to the cylinder hydraulic shock absorber
Autorzy:
Świątoniowski, A.
Szostak, J.
Gomułka, K.
Powiązania:
https://bibliotekanauki.pl/articles/245171.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
reducing tube
MESS
cylinder hydraulic shock absorber
DEFORM 3D
Opis:
The article presents the process of reducing the pipe and the influence of the shape of the tool on the geometric parameters of the cylinder. Charge material tube is precision welded cold drawn with an outer diameter ø 57 mm, made of stainless E355. Reduced pipe is used for cylinder hydraulic shock absorber. Formed cylinder is part of the structure MacPherson strut front suspension vehicle. Tube reduction process is carried out with cold working by using a hydraulic press. Analysed the influence of the diameter of the tool ø and profile angle transition into basic the geometric parameters of the deformed cylinder: inner diameter, wall thickness, pipe cylindrical deviation effect. The result of numerical simulation is a map of HMH stress. As well as the effect of the transition profile, angle the value of the tool diameter of the inner pipe, wall thickness and the value of cylindrical deviation effect. In this paper a comparative analysis of the outer diameter, inside diameter and cylindrical deviation effect for physical and numerical studies. Simulation of reduce tubes was carried out with DEFORM 3D software based on the finite element method. Numerical analysis allowed for a detailed knowledge of the specifics of the process and a comprehensive analysis of phenomena that are not possible to explore traditional methods.
Źródło:
Journal of KONES; 2014, 21, 1; 281-286
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pilotnye proekty individual’nyh zilyh domov s nizkim i ul’tranizkim energopotrebleniem s ispol’zovaniem bazovyh principov koncepcii passivnogo doma v Rossii
Pilot projects of individual residential houses for low and very low energy consumption with the use of the basic principles of passive house concept in Russia
Autorzy:
Elohov, A.
Powiązania:
https://bibliotekanauki.pl/articles/2065116.pdf
Data publikacji:
2012
Wydawca:
Politechnika Częstochowska
Tematy:
energy efficient buildings
passive house
reducing the cost of construction
Opis:
V Rossii realizovano (ili v processe realizacii) neskol’ko ob’ektov s ispol’zovaniem bazovyh komponentov passivnogo doma v Moskve i Moskovskoj oblasti, Ekaterinburge, Niznem Novgorode i Sankt-Peterburge. Pilotnye proekty otnosatsa k zdaniam s nizkim potrebleniem teplovoj energii na otoplenie. Dla dostizenia kriteriev standarta passivnogo doma pri proektirovanii neobhodimo kacestvenno vypolnit’ 5 osnovnyh trebovanij, a imenno: horosaa teploizolacia, otsutstvie teplovyh mostov v orgazdauscih konstrukciah, effektivnye okna, sertificirovannye dla passivnogo doma, germeticnaa vnutrennaa obolocka, mehaniceskaa sistema ventilacii s vysokoeffektivnoj rekuperaciej tepla. V nastoascij moment suscestvuet rad metodik dla kontrola za kacestvom stroitel’stva: teplovizionnoe obsledovanie, test BlowerDoor. Odnoj iz osnovnyh zadac i problemnyh voprosov avlaetsa snizenie stoimosti stroitel’stva takih zdanij v Rossii do urovna standartnyh zdanij.
There are realized a few projects using basic components of passive house in Russia: Moscow region, Yekaterinburg, Nizhny Novgorod and St. Petersburg. Pilot projects have low and ultra-low energy consumption for space heating. Energy efficient buildings and passive houses should the following have main features: good insulation, no thermal bridges, effective windows, certified for passive house; internal building envelope; mechanical ventilation system with highly efficient heat recovery coefficient. It also requires quality control of construction: heat monitoring with thermal imager and BlowerDoor test. One of the main purposes and problematic questions is reducing the cost of construction of buildings in Russia to the level of standard buildings.
Źródło:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2012, 2 (10); 13--21
2299-8535
2544-963X
Pojawia się w:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Henkin semantics for reasoning with natural language
Autorzy:
Hahn, M.
Richter, F.
Powiązania:
https://bibliotekanauki.pl/articles/103815.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Podstaw Informatyki PAN
Tematy:
Henkin semantics
reasoning
reducing higher-order reasoning
first-order reasoning
Opis:
The frequency of intensional and non-first-order definable operators in natural languages constitutes a challenge for automated reasoning with the kind of logical translations that are deemed adequate by formal semanticists. Whereas linguists employ expressive higher-order logics in their theories of meaning, the most successful logical reasoning strategies with natural language to date rely on sophisticated first-order theorem provers and model builders. In order to bridge the fundamental mathematical gap between linguistic theory and computational practice, we present a general translation from a higher-order logic frequently employed in the linguistics literature, two-sorted Type Theory, to first-order logic under Henkin semantics. We investigate alternative formulations of the translation, discuss their properties, and evaluate the availability of linguistically relevant inferences with standard theorem provers in a test suite of inference problems stated in English. The results of the experiment indicate that translation from higher-order logic to first-order logic under Henkin semantics is a promising strategy for automated reasoning with natural languages.
Źródło:
Journal of Language Modelling; 2015, 3, 2; 513-568
2299-856X
2299-8470
Pojawia się w:
Journal of Language Modelling
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Creating Virtual Environment for Educational Purposes of Schools and Universities
Autorzy:
Kacprzak, B.
Goetzen, P.
Marchlewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/108717.pdf
Data publikacji:
2012
Wydawca:
Społeczna Akademia Nauk w Łodzi
Tematy:
virtualization, database
VMware
ESXi
Linux
education
reducing costs
saving time
Opis:
The objective of this paper is to present how to prepare and setup the virtual machine environment on PC to improve speed, quality and overall feeling of education process with reducing costs of hardware and software. This project is a response to problem arising in most educational agencies and training centers. It is a result of continuously growing amount of data to process in today’s world. What is more, the range of subjects to teach widens everyday because of market needing versatile specialist on every level. As a result, the students nowadays have to get to know variety of systems, software and ideas in short period of time.
Źródło:
Journal of Applied Computer Science Methods; 2012, 4 No. 1; 29-44
1689-9636
Pojawia się w:
Journal of Applied Computer Science Methods
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reducing the Vat Gap in Poland
Autorzy:
Simińska-Domańska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/2034613.pdf
Data publikacji:
2019-07-31
Wydawca:
Wyższa Szkoła Finansów i Prawa w Bielsku-Białej
Tematy:
Value Added Tax
tax audits
frauds
reducing the VAT gap
Opis:
The main goal of the paper is to study the effectiveness of legal changes introduced in 2016 which were aimed at reduction of the VAT gap in Poland. The study consists of a normative, legal and quantitative analysis of data provided by the Ministry of Finance and shows the financial scale of VAT gap reduction. The thesis put forward in the paper assumes that the changes in law introduced in 2016 made it possible to effectively reduce the VAT gap in Poland and to tighten the system of VAT collection. The author managed to confirm the thesis in the course of the conducted research. The paper also emphasizes that the Polish tax on goods and services is well harmonized with its EU counterpart. Also the activities aimed at combating the phenomenon of VAT fraud seem to have brought positive results. At the same time, the central invoice register which is due to be implemented in July 2019, is expected to be a significant improvement.
Źródło:
Zeszyty Naukowe Wyższej Szkoły Finansów i Prawa w Bielsku-Białej; 2019, 2; 39-44
2084-1809
Pojawia się w:
Zeszyty Naukowe Wyższej Szkoły Finansów i Prawa w Bielsku-Białej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biocorrosion of dental alloys due to Desulfotomaculum nigrificans bacteria
Autorzy:
Mystkowska, J.
Powiązania:
https://bibliotekanauki.pl/articles/306868.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
biokorozja
bakterie
siarczany
XPS
biocorrosion
sulfate-reducing bacteria
Desulfotomaculum nigrificans
Aphelion
Opis:
Purpose: Degradation processes of metallic biomaterials in the oral cavity limit the stability and reliability of dental materials. The influence of environment bacteria Desulfotomaculum nigrificans sulfate reducing bacteria on the corrosion processes of Co-Cr-Mo and Ti-6Al-4V alloys was assessed. Methods: After 28 and 56 days of contact of the materials with the bacterial environment, the surfaces of the tested biomaterials were observed by means of confocal scanning laser microscopy (CSLM), and their chemical composition was studied using X-Ray Photoelectron Spectrometry (XPS). Results: Corrosive changes and the presence of sulfur (with medium atomic concentration of 0.5% for Co-Cr-Mo and 0.3% for Ti-6AL-4V) were observed on the surface of the biomaterials. Image analysis conducted using APHELION software indicated that corrosion pits took up approx. 2.3% and 1.8% (after 28 days) and 4.2% and 3.1% (after 56 days) of the total tested surfaces of cobalt and titanium alloys respectively. The greatest number of corrosion pits had a surface area within the range of 1-50 m2. They constituted from 37% until 83% of all changes, depending on the type of material. Conclusions: An evident influence of the SRB on the cobalt and titanium alloys surfaces was observed. Significant corrosive losses caused by the activity of micro-organisms were stated on the studied metallic surfaces. The results of this study have much cognitive and utilitarian significance.
Źródło:
Acta of Bioengineering and Biomechanics; 2016, 18, 4; 87-96
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental analysis by measurement of surface roughness variations in turning process of duplex stainless steel
Autorzy:
Krolczyk, G. M.
Legutko, S.
Powiązania:
https://bibliotekanauki.pl/articles/220659.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
turning
coatings
friction-reducing
optical microscopy
surface roughness analysis and models
Opis:
The objective of the investigation was to identify surface roughness after turning with wedges of coated sintered carbide. The investigation included predicting the average surface roughness in the dry machining of Duplex Stainless Steel (DSS) and the determination of load curves together with roughness profiles for various cutting conditions. The load curves and roughness profiles for various cutting wedges and variable cutting parameters were compared. It has been shown that dry cutting leads to a decrease in friction for lubricated surfaces, providing a small initial contact area where the surface is contacted. The study has been performed within a production facility during the production of electric motor parts and deep-well pumps.
Źródło:
Metrology and Measurement Systems; 2014, 21, 4; 759-770
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
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