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Wyszukujesz frazę "Kot, B" wg kryterium: Autor


Wyświetlanie 1-6 z 6
Tytuł:
Thermoanalytical investigations of edible oils and fats. Part II Kinetics of thermo-oxidative decomposition of soybean and sunflower oils
Termoanalityczne badania olejów i tłuszczów jadalnych. Cz.II Kinetyka termoutleniającego rozkładu oleju sojowego i słonecznikowego
Autorzy:
Kowalski, B.
Kot, B.
Powiązania:
https://bibliotekanauki.pl/articles/1399530.pdf
Data publikacji:
1989
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
edible oils
soybean oil
sunflower oil
kinetics of oxidation
thermal analysis
differential scanning calorimetry
Opis:
Soybean (SBO) and sunflower (SFO) oils were oxidized in an atmosphere of oxygen in the cell of the Differential Scanning Calorimeter (DSC). The peak maximum temperatures on monitored differential heat flow curves were measured and used for the calculation of Arrhenius activation energy and kinetic parametres of the process.
Oleje sojowy (SBO) i słonecznikowy (SFO) utleniano w komorze kalorymetru skanningowego (DSC) tlenem przepływającym przez komorę z szybkością 100 cm³/min. Postęp reakcji śledzono rejestrując różnicowy przepływ ciepła kompensujący efekt energetyczny reakcji. Stosując różne szybkości ogrzewania reagującego układu (β) oznaczono z termogramów temperaturę maksimum piku (Tmax) Liniowe w półlogarytmicznym układzie współrzędnych zależności lg β = f(Tmax) pozwoliły na wyznaczenie wartości dlg ζ(dT⁻¹ max). Z otrzymanych danych obliczono energię aktywacji proce u otrzymując dla oleju sojowego ESBO = 62800 J/mol i słonecznikowego ESFO = 60700 J/mol. Wartości te zostały użyte do wyznaczenia temperaturowych zależności zmian stałych szybkości reakcji (k) i połówkowych czasów reakcji (τ) przyjmując że są to reakcje pierwszego rzędu. Sparametryzowane ilościowo ujęcie kinetyki procesu termoutleniania badanych olejów jest spójne z oznaczanymi metodą chromatografii gazowej zawartościami kwasów tłuszczowych w olejach. Otrzymane wyniki dyskutowano ze względu na chemizm wolnorodnikowego mechanizmu procesu auto utleniania lipidów. Wskazano na możliwość zastosowania wyznaczonych parametrów do oceny odporności olejów na rozkład termoutleniający oraz wykorzystania danych w obliczeniach projektowo-inżynieryjnych. Oceniono, że metoda DSC jest szczególnie użyteczna w badaniach tennoanalitycznych i kinetycznych tak złożonych układów jak oleje roślinne.
Źródło:
Acta Alimentaria Polonica; 1989, 15(39), 1; 55-62
0137-1495
Pojawia się w:
Acta Alimentaria Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ komponentów organicznych na zmiany właściwości rekultywowanych gleb leśnych na siedlisku boru suchego
Influence of organic components on changes of the properties of reclaimed soils damaged by fire from coniferous dry forest
Autorzy:
Królak, B.
Kot, B.
Sterniczuk, K.
Troć, A.
Zychowicz, E.
Powalska, E.
Powiązania:
https://bibliotekanauki.pl/articles/1292980.pdf
Data publikacji:
2017
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
siedliska lesne
siedlisko boru suchego
rekultywacja gleb
dodatki do gleb
dodatki organiczne
kompost
osady sciekowe
torf ogrodniczy
gleby lesne
gleby rekultywowane
wlasciwosci chemiczne
wlasciwosci mikrobiologiczne
compost
sewage sludge
peat
soil chemical properties
microbiological analysis of soil
Opis:
The main objective of the study was to analyse the influence of compost produced from urban green waste, sewage sludge from municipal treatment plants and horticultural peat on changes of selected chemical and microbiological parameters of forest soil reclaimed after a fire. Soil samples were collected one and two years after the components had been applied to the soil. The results from experimental sites were compared with those from control samples. In the soil samples the following parameters were determined: content of carbon and nitrogen, reaction, hydrolytic acidity and the total amount of alkaline cations. Also the total number of bacteria and fungi, including moulds and yeast, was analysed. A year after components application, pH and the number of yeasts and moulds in the soil increased. After two years the content of nitrogen and the total number of bacteria in the soil increased as well. The most beneficial effect on changes in soil properties had the application of sewage sludge, which manifested itself in a decrease of the C/N ratio. This indicated the suitability of sewage sludge in reclamation of poor forest habitats. Peat underwent the slowest mineralization among all the organic components applied to the soil.
Źródło:
Leśne Prace Badawcze; 2017, 78, 2
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Motility activity, slime production, biofilm formation and genetic typing by ERIC-PCR for Pseudomonas aeruginosa strains isolated from bovine and other sources (human and environment)
Autorzy:
Wolska, K.
Szweda, P.
Lada, K.
Rytel, E.
Gucwa, K.
Kot, B.
Piechota, M.
Powiązania:
https://bibliotekanauki.pl/articles/30220.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The molecular-typing strategy, ERIC-PCR was used in an attempt to determine the genomic relationship of 28 P. aeruginosa strains isolated from faeces of healthy bovine, bovine mastitis and from faeces of hospital patients as well as from environment. ERIC-PCR fingerprinting revealed large molecular differentiation within this group of isolates. Twenty two out of 28 strains tested generated unique patterns of DNA bands and only three genotypes consisted of two isolates each were identified. We also tested the P. aeruginosa isolates for their ability to form a biofilm on abiotic surfaces including polyvinylchloride and polystyrene. Different biofilm-forming abilities were demonstrated among strains; however, most of them (64.3%) showed moderate-biofilm forming ability. The strains with increased swimming and twitching motility displayed elevated biofilm formation. However, a negative correlation was found between slime and initial biofilm production. On the basis of the results obtained, we suggest that there are no major differences in phenotypic properties between P. aeruginosa strains isolated from different sources.
Źródło:
Polish Journal of Veterinary Sciences; 2014, 17, 2; 321-329
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of classical enterotoxin genes in staphylococci from milk of cows with- and without mastitis and the cowshed environment
Autorzy:
Piechota, M.
Kot, B.
Zdunek, E.
Mitrus, J.
Wicha, J.
Wolska, M.K.
Sachanowicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/31921.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The aim of this study was to analyze by PCR 185 isolates of Staphylococcus from milk of cows with- and without mastitis and from the cowsheds environment for their potential ability to produce five classical staphylococcal enterotoxins. Among S. aureus isolates 8 (32%) carried enterotoxin genes and only 2 of them had more than one gene. The enterotoxin genes were detected in 22 (13.7%) coagulase-negative staphylococci (CNS) isolates, among them in 9 (11.4%) isolates of S. xylosus, 5 (16.7%) S. sciuri, 3 (10.3%) S. epidermidis and in 5 (22.7%) Staphylococcus spp. In some CNS 2 or 3 genes were detected simultaneously. Among the investigated enterotoxin genes, sec was the most prevalent (70%). The genes encoding enterotoxin B and D were detected in 5 (16.7%) and 6 (20%) isolates, respectively. The lowest number of isolates had sea and see genes.The genes encoding enterotoxins were often identified in staphylococci from milk of cows with mastitis (73.4% of detected genes), while only 6 (20%) isolates from milk of cows without mastitis and 2 (6.6%) isolates from cowshed environment were positive for enterotoxin genes.The results showed that CNS from bovine milk, like S. aureus, carried enterotoxin genes and may pose a risk for public health.
Źródło:
Polish Journal of Veterinary Sciences; 2014, 17, 3
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phenotypic and genotypic antimicrobial resistance of staphylococci from bovine milk
Autorzy:
Kot, B.
Piechota, M.
Wolska, K.M.
Frankowska, A.
Zdunek, E.
Binek, T.
Klopotowska, E.
Antosiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/31274.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The aim of this study was to examine phenotypic and genotypic antimicrobial resistance of staphylococci from milk samples from cows with subclinical and clinical mastitis and from cows without mastitis symptoms to methicillin, tetracyclines, macrolides and lincosamides (ML). Of 207 strains, including 34 S. aureus and 173 coagulase-negative staphylococci (CNS), 11 (6.4%) CNS strains were phenotypically resistant to methicillin. The mecA gene was detected by PCR only in two S. xylosus strains and one strain of S. epidermidis and S. simulans. No methicillin-resistant S. aureus strains were observed. In methicillin-resistant strains with mecA, gene resistance to other investigated antibiotics was not observed. Phenotypic resistance to tetracycline was detected in 11.0% of CNS strains and 47.4% of them carried the tetK gene. Of 173 CNS strains studied, 27 (15.6%) were resistant to at least one ML antibiotic. The resistance gene ermC was detected in 55.5% of the 27 ML-resistant strains. The ermA and ermB genes were detected in 14.8% and 11.1% of ML-resistant CNS strains, respectively. Antimicrobial resistance to methicillin, tetracyclines and macrolides was detected more frequently in staphylococcal strains from clinical mastitis compared to animals with subclinical symptoms and without mastitis, while the resistance to lincosamides showed a similar frequency in all groups of cows. In conclusion, CNS species from bovine milk differ in phenotypic and genotypic antimicrobial resistance profiles, and the use of PCR technique alone for the detection of methicillin, macrolide, lincosamide and tetyracycline resistance in CNS from cattle is not reliable.
Źródło:
Polish Journal of Veterinary Sciences; 2012, 15, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antimicrobial resistance and genotypes of staphylococci from bovine milk and the cowshed environment
Autorzy:
Kot, B.
Piechota, M.
Antos-Bielska, M.
Zdunek, E.
Wolska, K.M.
Binek, T.
Olszewska, J.
Gulinski, P.
Trafny, E.A.
Powiązania:
https://bibliotekanauki.pl/articles/30335.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Investigation of antimicrobial resistance and genetic relatedness of staphylococci from milk of cows with mastitis and cowshed environment was the aim of this study. Antimicrobial resistance against 14 antimicrobials were determined by using a disc diffusion method. Genetic similarity between the most frequently isolated species was analysed by PFGE (pulsed-field gel electrophoresis). Haemolytic activity, DNase, protease and esterase production was also investigated. Coagulase-negative Staphylococcus species were isolated from 30.8% of milk samples from cows with mastitis. The most frequently isolated species was Staphylococcus xylosus and yield of these organisms was significantly associated with milk of mastitis cows. S. epidermidis was a predominant penicillin-resistant species. High frequency of resistance to lincomycin was observed among isolates of S. sciuri (54.2%) and S. xylosus (25.9%) from cows with mastitis. PFGE (pulsed-field gel electrophoresis) analysis of 29 Staphylococcus aureus isolates showed the presence of 17 PFGE pulsotypes. Isolates of S. sciuri (n=36) had unique PFGE patterns. Some S. xylosus isolates from milk and milker’s hands had the same PFGE pulsotypes, and this observation could indicate that dairyman may be a potential source of the infection. The pulsotype of each of the remaining isolates of S. xylosus suggested that they might have come from common environmental sources; however, these isolates differed in antibiotic resistance pattern or virulence traits. Therefore, knowledge about antibiotic sensitivity pattern and virulence factors of a CNS isolate, besides its genotype, may be informative in tracking the source of the infection.
Źródło:
Polish Journal of Veterinary Sciences; 2012, 15, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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