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Wyświetlanie 1-6 z 6
Tytuł:
Eliminacja clostridium perfringens podczas kondycjonowania osadu czynnego nadmiernego
Elimination of clostridium perfringens during surplus activated sludge handling
Autorzy:
Grűbel, K
Chrobak, E
Rusin, A
Machnicka, A.
Powiązania:
https://bibliotekanauki.pl/articles/400040.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Clostridium perfringens
fala elektromagnetyczna
osad czynny nadmierny
materia organiczna
electromagnetic wave
surplus activated sludge
organic matter
Opis:
Praca przedstawia możliwość eliminacji Clostridium perfringens w procesie kondycjonowania osadu czynnego nadmiernego z wykorzystaniem promieniowania mikrofalowego. Na podstawie wyników badań stwierdzono, że promieniowanie mikrofalowe (700W i 900W) wykazuje dezintegrujące działanie wyrażone wzrostem wartości ChZT w cieczy nadosadowej: 12 krotny wzrost wartości ChZT przy mocy 700W i 13 krotny przy mocy promieniowania 900W. Fala elektromagnetyczna przyczyniła się do częściowej higienizacji osadu. Spowodowała redukcję liczby Clostridium perfringens odpowiednio o 52% i 56% w czasie 120s oddziaływania, przy mocy 700W i 900W. Redukcja ogólnej liczby bakterii pod wpływem mikrofal wyniosła 42% i 51% (odpowiednio dla 700W i 900W), a pałeczek z rodziny Enterobacteriaceae od 54% do 70% w zależności od mocy promieniowania, czasu działania i własności biochemicznej.
The work presents the possibility of elimination of Clostridium perfringens in surplus activated sludge handling by microwave radiation. An assessment of the impact of microwave radiation as a disintegration and higienisation method of surplus activated sludge was based on an analysis of the value of COD and changes in population of the bacteria Clostridium perfringens and overall sticks in the family Enterobacteriaceae. Basis on the results of the research was concluded that microwave radiation (700W and 900W) shows disintegration action expressed in COD value in the supernatant increase: 12 times increase value of COD with power 700W and 13 times for 900W radiation power. Electromagnetic wave contributed to partial higienisation of surplus activated sludge. The number of Clostridium perfringens decrease about 52% and 56% during the 120s of higienisation process with power 700W and 900W, respectively. Reduction of the overall number of bacteria under the influence of microwave radiation was 42% and 51% (respectively for 700W and 900W), and sticks from the family Enterobacteriaceae from 54% to 70% depending on the power of radiation, the time of operation and biochemical properties
Źródło:
Inżynieria Ekologiczna; 2013, 32; 40-47
2081-139X
2392-0629
Pojawia się w:
Inżynieria Ekologiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Naturalne i syntetyczne pochodne 5,8-chinolinodionu wykazujące aktywność biologiczną
Natural and synthetic 5,8-quinolinedione derivatives exhibited biological activity
Autorzy:
Kadela-Tomanek, M.
Chrobak, E.
Bębenek, E.
Boryczka, S.
Powiązania:
https://bibliotekanauki.pl/articles/172615.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
5,8-chinolinodion
streptonigryna
lawendamycyna
aktywność biologiczna
5,8-quinolinedione
streptonigrin
lavendamicin
biological activity
Opis:
The compounds produced by a living organisms are most commonly used as medicinal agents and starting materials to the preparation of new semi-synthetic derivatives. It is estimated that over 23% of currently used medicinal products are natural substances. Natural compounds and their semisynthetic derivatives are most often used in the treatment of cancer and the treatment of infectious diseases. One of the groups of compounds obtained from Gram-positive bacterium are 5,8-quinolinedione antibiotics, like: streptonigrin, lavendamycin and streptonigron. The all compounds exhibit high anticancer, antimicrobial and antiviral activity. Unfortunately due to high toxicity this alkaloids did not find place in the therapy. The mechanism of action depends on interaction of compounds with the nicotinamide quinone oxidoreductase 1 (NQO1). The 5,8-quinolinedione can be reduced by the NAD(P)H as a cofactor to form the semiquinone or hydroquinone intermediates. These compounds can react with oxygen yielding a regenerated 5,8-quinolinedione fragment and creating the hydroxyl radicals, which are ultimately responsible for the DNA strands cleavage. The structure–activity relationship study has shown that the most important part of the molecule is the 5,8-quinolinedione moiety. Furthermore, it was found, that the introduction of amine, hydroxyl or thiol substituents at position 6 or 7 of the 5,8-quinolinedione moiety results in an enhanced biological activity. A lot of synthetic derivatives of 5,8-quinolinediones which containing amine, alkoxyl and thiol groups at the C-6 or/and C-7 positions have been obtained during the last few years. Commonly this compounds are obtained in the reaction of 6,7-dichloro-5,8-quinolinedione with nucleophilic factor. Depending on the reaction conditions, mono- or di-substituted derivatives are obtained. Most of synthesized compounds exhibit high biological activity, like: anticancer, antibacterial, antiviral, anti-inflammatory.
Źródło:
Wiadomości Chemiczne; 2017, 71, 11-12; 795-815
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aktywność biologiczna związków acetylenowych pochodzenia naturalnego
Biological activity of acetylene compounds of natural origin
Autorzy:
Kadela-Tomanek, M.
Chrobak, E.
Bębenek, E.
Lubczyńska, A.
Siudak, S.
Wójcik, A.
Otulakowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/171688.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
produkty naturalne
pochodne acetylenowe
cytotoksyczność
natural products
acetylenic derivatives
cytotoxicity
Opis:
The natural acetylenic products containing at least one a carbon-carbon triple bond, are important class of compounds widely distributed in the environment. Development of spectroscopic techniques and methods for the isolation of metabolites allowed the extraction of natural acetylenic compounds. The most of these substances have been obtained from marine organisms, such as: cyanobacteria, algae and sponges. The next source of metabolites are herbal plants, which were used in the Chinese traditional medicine. A many of them show interesting biological activity. The first isolated natural compound possessing an acetylenic unit was dehydromatricaria ester, which was obtained from rhizome European goldenrod (Solidago virgaurea). To present day have been found and researched more than 2000 natural acetylenic metabolites. Due to the chemical structure, natural acetylenic compounds were divided into six groups: peptides, aromatic compounds, enediyne antibiotics, sterols, carotenoids, and poliacetylenic compounds . This article focuses natural acetylenic substances, which exhibit interesting biological properties, particularly anticancer ones. The review presents many of such metabolites, including fatty alcohols, ketones, acids, ethers, and carotenoids.
Źródło:
Wiadomości Chemiczne; 2016, 70, 9-10; 613-632
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Crystal Structure and Magnetic Properties οf Selected fcc FeNi and $Fe_{40}Ni_{40}B_{20}$ Alloys
Autorzy:
Kądziołka-Gaweł, M.
Zarek, W.
Popiel, E.
Chrobak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1539142.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ga
82.80.Ej
Opis:
The crystal structure and magnetic properties of polycrystalline alloys $Fe_{62.5}Ni_{37.5},$ $Fe_{60}Ni_{40},$ $Fe_{50}Ni_{50}$ obtained by arc-melting and $Fe_{40}Ni_{40}B_{20}$ alloy obtained by melt spinning technique were investigated by X-ray, magnetostatic and Mössbauer effect methods. The X-ray measurements show that $Fe_{40}Ni_{40}B_{20}$ alloy has a face-centered structure (fcc) which means that boron did not cause an amorphous rendering. The lattice constants for this alloy (a = 3.53 Å) is smaller than for FeNi alloys (a > 3.57 Å) which suggests that boron atoms were built-in in the crystal lattice. The Curie temperature of this alloy is more than 150 K higher in comparison with the of FeNi alloys, but the magnetic moment connected with this alloy is more than 0.17 $μ_{B}$/atom smaller than the magnetic moments of FeNi alloys. The shape of hyperfine field distribution for $Fe_{40}Ni_{40}B_{20}$ is similar to the shape of hyperfine field distribution for the investigated fcc $Fe_{62.5}Ni_{37.5}$ alloy, but both are different from another investigated hyperfine field distribution of FeNi alloys.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 412-414
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Size Effect of Hard Magnetic Properties of Fe-Nb-B-Tb Milled Alloys
Autorzy:
Granek, K.
Ziółkowski, G.
Chrobak, A.
Klimontko, J.
Talik, E.
Powiązania:
https://bibliotekanauki.pl/articles/1030390.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
75.50.Tt
75.60.d
76.80.+y
Opis:
The paper refers to magnetic and structural properties of powders made of Fe-Nb-B-Tb ultra-high coercive alloy. The initial alloy was milled in a low energy mill for 1 h and 14 h. With increasing milling time we observed gradual deterioration of hard magnetic properties i.e. the coercive field decreases from 5.51 T to 0.14 T for the bulk alloy and 14 h milled powder, respectively. However, for the 1 h milling time the micrometric powder reveals quite high coercivity of 2.77 T which is promising for possible applications in magnetic composites.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 645-647
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the boron addition on the structure of the Ni-Mn-Co-In alloys
Autorzy:
Prusik, K.
Matyja, E.
Zubko, M.
Kubisztal, M.
Chrobak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1153865.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Lp
71.20.Be
Opis:
Series of Ni_{45.5-x}Co_{4.5}Mn_{36.6}In_{13.4}B_{x} (at.%, x=0, 0.05, 0.1, 0.5, 1.0) polycrystalline magnetic shape memory alloys produced by the induction melting were examined in terms of the structure and transition temperatures. The structure of the alloys was determined by the X-ray diffraction and transmission electron microscopy. Scanning electron microscopy and electron backscattering diffraction techniques were applied to obtain the microstructure and texture of alloys. Boron addition promotes nucleation of the second Co-rich and In-poor phase as well as causes decrease of the martensitic transformation temperatures.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1023-1025
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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