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    Wyświetlanie 1-6 z 6
    Tytuł:
    Comparative study of phenol degradation with a wild-type and genetically modified P. vesicularis (pBR322). plasmid stability and fame profiling
    Autorzy:
    Mrozik, A.
    Swędzioł, Ż.
    Miga, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/207456.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biodegradation
    phenols
    comparative studies
    fatty acid methyl ester
    phenol degradation
    plasmid stability
    biodegradacja
    kwasy tłuszczowe
    fenole
    badania porównawcze
    ester metylowy kwasu tłuszczowego
    degradacja fenolu
    stabilność plazmidu
    Opis:
    It was evidenced that P. vesicularis is an efficient degrader of phenol but does not have a reporter system for monitoring bacterial survival in the environment. Therefore, P. vesicularis (pBR322) has been constructed. In this study we experimentally confirmed that introduction of plasmid pBR322 into P. vesicularis did not change its ability to degrade phenol in liquid media and after its inoculation into sterile soil. Moreover, it has been shown that plasmid pBR322 was stable in P. vesicularis during all experiments. Additionally, the pattern of fatty acid methyl esters for P. vesicularis (pBR322) looked similar to that of P. vesicularis under phenol exposure. Some fatty acids, especially branched and cyclopropane ones were sensitive markers of phenol utilization. These findings indicate that P. vesicularis (pBR322) due to the presence of plasmid could be used instead of P. vesicularis in bioaugmentation of phenol-contaminated areas.
    Źródło:
    Environment Protection Engineering; 2015, 41, 1; 137-155
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    DETERMINATION OF FLUCONAZOLE AND ITS OXIDATION PRODUCTS WITH KINETIC EVALUATION UNDER POTASSIUM PERMANGANATE TREATMENT IN ACIDIC SOLUTIONS BY ULTRA PERFORMANCE LIQUID CHROMATOGRAPHY-TANDEM MASS SPECTROMETRY
    Autorzy:
    Hubicka, Urszula
    Krzek, Jan
    Żmudzki, Paweł
    Żuromska-Witek, Barbara
    Motyl, Dariusz
    Kryczyk, Agata
    Powiązania:
    https://bibliotekanauki.pl/articles/895338.pdf
    Data publikacji:
    2019-02-28
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    stability
    fluconazole
    oxidation studies
    kinetic evaluation
    UPLC/MS
    Opis:
    For the determination of fluconazole (FLU) oxidation stability under permanganate treatment at the acidic pH, a sensitive, reproducible, and stability-indicating ultra-performance liquid chromatography–mass spectrometry (UPLC/MS) method was developed. Three additional products (tR = 5.79, 6.98, 7.54) were observed besides the FLU (tR = 6.22). The proposed method was used to study the kinetics of FLU oxidative degradation. An oxidation process followed kinetics of the second-order reaction. The degradation rate constant and the corresponding half-life obtained for the FLU oxidative degradation were 0.5626 h-1 and 16.69 h, respectively. The putative oxidation products were characterized and their fragmentation pathways, on a basis of MS/MS data, were proposed.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 1; 19-27
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metody analityczne badania preparatów kosmetycznych - wczoraj i dziś
    Analitical methods for testing cosmetic products - in the past and nowadays
    Autorzy:
    Olejnik, Anna
    Gornowicz-Porowska, Justyna
    Gościańska, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/2200575.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    produkty kosmetyczne
    chromatografia
    spektrometria mas
    test aplikacyjny
    badania stabilności
    cosmetic products
    chromatography
    mass spectrometry
    application test
    stability studies
    Opis:
    The safety and quality of each cosmetic product is tested before it is introduced to the market. There are highly regulated requirements that producers should comply with. However, as the cosmetic products are highly complexed mixture of different ingredients, detailed characterization of their composition remains still a challenge. Currently, due to the development of modern technologies, a wide range of analytical methods are available. Scientists are increasingly adapting highly sophisticated and advanced techniques to precisely identify and quantify the components of cosmetic products. The aim of this article is to present the analytical methods applied to examine cosmetics taking into account their advantages and limitations. The progress made in recent years in the design of novel instruments leading to their greater efficiency, selectivity and sensitivity was also considered. The techniques that are commonly used in the quality control laboratories of cosmetic companies were presented. Cosmetics analysis is not only limited to the characterization of product itself. Today, in vivo tests are very essential to determine the efficacy of formulations directly on the skin surface. Therefore, in this article modern devices dedicated to theses analyses were described in detail.
    Źródło:
    Wiadomości Chemiczne; 2022, 76, 7-8; 607--633
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Praktyka laboratoryjna i warunki jej stabilności. Wokół stanowisk Pawła Zeidlera oraz Iana Hackinga
    Laboratory Practice and Conditions of Its Stability. Remarks on Paweł Zeidler’s and Ian Hacking’s Views
    Autorzy:
    Bińczyk, Ewa
    Powiązania:
    https://bibliotekanauki.pl/articles/577432.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Socjologia wiedzy naukowej
    studia nad nauką oraz technologią
    nowy eksperymentalizm
    praktyka laboratoryjna
    stabilność nauki
    rola metafor w nauce
    krytyka reprezentacjonizmu
    teza Duhema
    solidne dopasowanie
    interaktywna stabilizacja
    metrologia
    Sociology of Scientific Knowledge
    Science and Technology Studies
    New Experimentalism
    laboratory practice
    stability of science
    the role of metaphors in science
    the criticism of representationalism
    Duhem thesis
    robust fit
    interactive stabilization
    metrology
    Opis:
    The article presents the specificity of standpoints in which laboratory, instrumental and practical aspect of science is strongly underlined. This is mainly Sociology of Scientific Knowledge (Science and Technology Studies, STS), but also the interesting conception of a Polish philosopher, Paweł Zeidler, who analyses laboratory practice of chemistry. The text indicates the originality of Zeidler’s view, its merits and weak points. The author polemicizes with Zeidler and proposes an alternative interpretation of Ian Hacking’s perspective, who describes the roots of stability of laboratory practice.
    Źródło:
    Zagadnienia Naukoznawstwa; 2012, 48, 3 (193); 163-183
    0044-1619
    Pojawia się w:
    Zagadnienia Naukoznawstwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on stability of emulsions containing carotenoids
    Autorzy:
    Igielska-Kalwat, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/1038379.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    carotenoids
    particle size
    semisolid formulations
    stability studies
    Opis:
    Emulsions are commonly used to improve aesthetics but they may also be applied to deliver active ingredients. Recently, a group of pigments known as carotenoids has been added to emulsions as an active compound mainly due to their antioxidant properties. The stability of these formulations is a critical parameter for both, pharmaceutical and cosmetics industry. Therefore, in this study two analytical methods, multiple light scattering and laser diffraction, were tested to determine the stability of various emulsions containing carotenoids (β-carotene, lycopene, astaxanthin). Even small changes in stability of emulsions were determined very early. The results of both methods proved that the type of carotenoid used did not influence the emulsions' stability. The stability of emulsions depends mainly on the preparation methods and on the type of emulsifier applied.
    Źródło:
    Acta Biochimica Polonica; 2018, 65, 3; 455-463
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, characterization, biological activity of Schiff bases derived from 2-bromo-4-methyl aniline and its potentiometric studies with Cu(II), Co(II) and Ni(II) ions
    Autorzy:
    Upadhyay, Surbhi V.
    Zala, Raksha V.
    Bhatt, Keyur D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030767.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    2-bromo-4-methyl aniline
    Antimicrobial activity
    Irving-Rossotti
    Potentiometric studies
    Schiff base
    Stability constant
    Opis:
    Schiff bases namely, 2-bromo-4-methyl-N-(2-nitrobenzylidene)aniline; 2-bromo-4-methyl-N-(2,4,5-trimethoxybenzylidene)aniline; 2-bromo-N-(4-methoxybenzylidene)-4-methylaniline and N-((1H-indol-3-yl)methylene-2-bromo-4-methylaniline have been synthesized and characterized by elemental analysis, FT-IR, Mass and 1H-NMR spectroscopy. Schiff bases have been screened for Antimicrobial activity against bacteria and fungi by using MIC determination. Binary complexes of Co(II), Ni(II) and Cu(II) with Schiff bases in solution have been studied potentiometrically in 60:40 % (V/V) 1,4-dioxane-water system at constant temperature 27 ±0.5 ºC and at an ionic strength of 0.1 M KNO3. The order of stability constant of formed binary complexes in solution was examined.
    Źródło:
    World Scientific News; 2020, 145; 1-15
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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