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Wyświetlanie 1-15 z 47
Tytuł:
Stripe Phases in the Hubbard Model
Autorzy:
Góra, D.
Rościszewski, K.
Oleś, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/2012901.pdf
Data publikacji:
2000-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.27.+a
74.72.-h
75.10.-b
64.60.-i
Opis:
We investigate the magnetic and charge ordering in the stripe phases obtained while using correlated wave functions for finite 8×8 clusters described by the Hubbard model with extended hopping. Nonmagnetic vertical (01) site-centered domain walls and (11) bond-centered stripes are found for the parameters of La$\text{}_{2-x}$Sr$\text{}_{x}$CuO$\text{}_{4}$ and YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{6+x}$, respectively, at doping δ=1/8. The obtained half-filled domain nonmagnetic walls reproduce the maxima observed in neutron scattering for La$\text{}_{2-x}$Sr$\text{}_{x}$CuO$\text{}_{4}$.
Źródło:
Acta Physica Polonica A; 2000, 97, 1; 225-228
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conceptual processes for zeolite membrane based hydroisomerization of light alkanes
Autorzy:
Maloncy, M. L.
Gora, L.
Jansen, J. C.
Maschmeyer, Th.
Powiązania:
https://bibliotekanauki.pl/articles/347005.pdf
Data publikacji:
2003
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
zeolite membrane
hydroisomerization
separation
conceptual process
hexane
heptane
Opis:
A zeolite membrane reactor concept for the hydroisomerization of n-hexane was applied experimentally. The results indicate separation selectivities with factors close to 20 for n-, mono- and dibranched components in a gas mixture, as well as nhexane conversions up to equilibrium values. The research octane number calculated for the product stream of the different experiments indicates numbers as high as 85. For the hydroisomerization of C7 alkanes, a concept of two reactors and a zeolite membrane was proposed and an industrial scale process was simulated. A high octane number product containing tribranched, and a part of dibranched, C7 isomers is predicted. Although the product yield was calculated to be only 24% of the process feed, there was an improvement in a research octane number from 57 for the feed to 92 for the product. Both processes show that the application of zeolite membranes in the hydroisomerization of light alkanes can results in a octane number higher, than in the "state of the art" processes. The membrane unit, however, is the main cost driver of the processes, thus, the economical feasibility of industrial scale light alkanes hydroisomerization processes using zeolite membranes is restricted to its further commercial development.
Źródło:
Ars Separatoria Acta; 2003, 2; 18-28
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Convex compact family of polynomials and its stability
Autorzy:
Góra, M.
Powiązania:
https://bibliotekanauki.pl/articles/255222.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
stability
convex set of polynomials
regular set
Opis:
Let P be a set of real polynomials of degree n. Set P can be identified with some subset P of Rn consists of vectors of coefficients of P. If P as a polytope, then to ascertain whether the entire family of polynomials P is stable or not, it suffices to examine the stability of the one-dimensional boundary sets of P. In present paper, we extend this result to convex compact polonomial families. Examples are presented to illustrate the results.
Źródło:
Opuscula Mathematica; 2005, 25, 2; 189-194
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oxidative metabolism, mutagenic and carcinogenic properties of some polycyclic aromatic hydrocarbons
Autorzy:
Łuczyński, M. K.
Góra, M.
Brzuzan, P.
Wilamowski, J.
Kozik, B.
Powiązania:
https://bibliotekanauki.pl/articles/363172.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
metabolizm tlenowy
właściwości mutagenne
właściwości rakotwórcze
wielopierścieniowe węglowodory aromatyczne
oxidative metabolism
mutagenic properties
carcinogenic properties
polycyclic aromatic hydrocarbons
Opis:
This attempt to synthesize the present state of knowledge on the correlation between the structure of chosen PAHs and their mutagenic or carcinogenic activity shows that the dependencies cannot be treated univocally. Extreme complexity of the subject, typical for investigations on the boundary between chemistry and biology, inclines one to search for new ways of synthesis of new compounds, which would be of interest for biologists studying the problem of chemical carcinogenesis. On the other hand, there is a strong need for elaborating a standardized test that would explicitly define the carcinogenic properties of a specific compound. The use of a variety of methods for the determination of carcinogenic potency of chemical compounds combined with simultaneous differentiation of structure of examined compounds, sometimes leads to contradictory conclusions. Correlation between mutagenic and carcinogenic activity of some compounds is also sometimes questionable. Modern molecular biology should allow for elaborating a method which would give a satisfactory and reliable answer to the fundamental question: is a specific compound carcinogenous for a human organism? And if so - to what extent?
Źródło:
Environmental Biotechnology; 2005, 1, 1; 16-28
1734-4964
Pojawia się w:
Environmental Biotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relative quantification of CYP1A gene expression in whitefish (Coregonus lavaretus) exposed to benzo[a]pyrene
Autorzy:
Brzuzan, P.
Jurczyk, Ł.
Łuczyński, M. K.
Góra, M.
Powiązania:
https://bibliotekanauki.pl/articles/363188.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
ekspresja genu CYP1A
sieja
benzo(a)piren
real-time PCR
benzo(a)pyrene
Coregonus lavaretus
CYP1A gene expression
RealTime PCR
relative quantification
Opis:
The expression of CYP1A (cytochrome P4501A) can be induced by a number of aromatic compounds in teleost fishes. We developed a real-time PCR assay for measuring relative quantities (RQ) of CYP1A mRNA in whitefish (Coregonus lavaretus). To test for the usefulness of the assay we performed a treatment study, using benzo[a]pyrene (B[a]P) a model CYP1A inducer. Primers for the CYP1A gene were adapted from the literature, whereas those for [beta]-actin (endogenous control) were designed from a region that was found to be conserved among salmonid [beta]-actin genes. A group of hatchery raised whitefish, with an average body mass of 15 g and total length of 12 cm were given an intraperitoneal injection (10 mg/kg) of B[a]P in corn oil (2 mg B[a]P/ml corn oil) or corn oil alone (Control). After 48 h, whitefish liver, head kidney and brains were collected for mRNA isolation and analysis. In all three tissues sampled, CYP1A mRNA was affected by treatment with B[a]P. Head kidney tissue showed the greatest induction potential (RQ=11.00) from base levels (RQ=1.00), followed by liver (RQ=9.45), and brain (RQ=3.76). These results demonstrated that CYP1A was highly inducible by B[a]P in whitefish head kidney and liver, and to some extent, in brain tissue. The approach presented here has the advantage of providing rapid and accurate measures of CYP1A induction in various tissues of fish responding to PAH contaminant exposure.
Źródło:
Environmental Biotechnology; 2005, 1, 1; 11-15
1734-4964
Pojawia się w:
Environmental Biotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and fungistatic activity of aryl-substituted naphthalene- and indene-2-carbonitriles
Autorzy:
Kozik, B
Burgieł, Z. J.
Sepioł, J. J.
Wilamowski, J.
Łuczyński, M. K.
Góra, M.
Powiązania:
https://bibliotekanauki.pl/articles/363192.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
grzyby fitopatogenne
WWA
aktywność fungistatyczna
ochrona roślin
phytopathogenic fungi
PAHs
fungistatic activity
plant protection
Opis:
4-Aryl-substituted 1-aminonaphthalene-2-carbonitriles and 3-phenyl-1-oxo-1H-indene-2-carbonitriles were prepared in a two--step synthesis from appropriate carbonyl compounds and were evaluated in vitro for growth-inhibiting activity against some phytopathogenic fungi: Fusarium culmorum, Penicillium expansum, Botrytis cinerea and Alternaria species. The results were compared with the activity of a commercial fungicide - captan. The highest fungistatic activity was revealed by 1-amino-4-phenylnaphthalene-2-carbonitrile. An efficient synthesis of 1-amino-4-arylnaphthalene-2-carbonitriles involves condensation of diarylacetaldehydes or 1,1-diarylacetones with malonodinitrile and cyclization of the obtained aryl-ylidenemalonodinitriles in concentrated sulfuric acid. The benzannulation reaction is accompanied by a quasi-aromatic rearrangement. The indenone derivatives were synthesized in the same manner from substituted benzophenones. As the formation of five-membered ring during the cyclization of diarylmethylidenemalonodinitriles was less effective, the rearrangement was not observed.
Źródło:
Environmental Biotechnology; 2006, 2, 1; 20-25
1734-4964
Pojawia się w:
Environmental Biotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cyclopenta[c]phenanthrene induction of CYP1A in brain of rainbow trout (Oncorhynchus mykiss)
Autorzy:
Brzuzan, P.
Woźny, M.
Łuczyński, M. K.
Góra, M.
Ciesielski, S.
Kuźmiński, H.
Powiązania:
https://bibliotekanauki.pl/articles/363272.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
benzo(a)piren
mózg
CYP1A
cyklopenta[c]fenantren
absolutna kwantyfikacja mRNA
pstrąg tęczowy
benzo(a)pyrene
brain
cyclopenta[c]phenanthrene
mRNA absolute quantification
rainbow trout
Opis:
We assessed the effects of cyclopenta[c]phenanthrene (CP[c]Ph) and benzo[a]pyrene (B[a]P; positive control) on CYP1A gene expression in brain of juvenile rainbow trout (Oncorhynchus mykiss) using the quantitative reverse transcription polymerase chain reaction (Q-RT-PCR). A group of hatchery raised rainbow trout, with an average body mass of 49.4 g and total length of 15.5 cm were given an intraperitoneal injection (10 mg*kg-1) of either CP[c]Ph or B[a]P in corn oil (2 mg*mi-1 corn oil) or corn oil alone (control). After 24 and 48 h, trout brains were collected for mRNA isolation and analysis. After 24 hours of the exposure, only B[a]P-treated rainbow trout had 10-fold higher number of CYP1A transcripts (mean = 3.63*106 transcripts*µg-1 total RNA) than control fish (3.24*105 transcripts*µg-1 total RNA; Tukey test, P<0.05). After 48 hrs, significantly higher levels of CYP1A expression (Tukey test, P<0.001) were found in either CP[c]Ph- or B[a]P- induced group (1.45*106 and 6.92*106 transcriptsźµg-1 total RNA, respectively) over a control group (mean=1.41*105 transcripts*µg-1 total RNA). The finding that CYP1A in brain tissue was inducible by CP[c]Ph, a polycyclic aromatic hydrocarbon (PAH) of different than B[a]P planar characteristics, may further validate the use of rainbow trout brain CYP1A mRNA levels as a biomarker of PAH exposure.
Źródło:
Environmental Biotechnology; 2007, 3, 1; 10-14
1734-4964
Pojawia się w:
Environmental Biotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CYP1A gene expression in adipose fin of rainbow trout (Oncorhynchus mykiss Walbaum) exposed to benzo[a]pyrene
Autorzy:
Brzuzan, P.
Woźny, M.
Łuczyński, M. K.
Góra, M.
Powiązania:
https://bibliotekanauki.pl/articles/363276.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
płetwa tłuszczowa
benzo(a)piren
CYP1A mRNA
skrzela
pstrąg tęczowy
real-time PCR
adipose fin
benzo(a)pyrene
gill
rainbow trout
Real-Time PCR
Opis:
Proximate to the environment, adipose fin of fish may be considered as a lipid storing tissue, and thus can be a target for either waterborne or dietary polycyclic aromatic compounds (PACs). We determined the effects of benzo[a]pyrene (B[a]P), a model PAC member, on CYP1A gene expression in adipose fin and compared that with the effects in gill of juvenile rainbow trout (Oncorhynchus mykiss Walbaum) using the quantitative reverse transcription polymerase chain reaction (Q-RT-PCR). The results of the study demonstrated that constitutive CYP1A mRNA was present in adipose fin of rainbow trout, but the transcripts were far less abundant than those in gill tissue. We confirmed high CYP1A gene induction potential of the gills in rainbow trout injected with benzo[a]pyrene, but also showed moderately and transiently induced CYP1A mRNA in adipose fin. The modest and transitory gene expression may preclude rainbow trout adipose fin CYP1A mRNA levels from using it as an indicator of sustained exposure of fish to the polycyclic aromatic compounds.
Źródło:
Environmental Biotechnology; 2007, 3, 1; 20-24
1734-4964
Pojawia się w:
Environmental Biotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary evaluation of mutagenic activity of two amino derivatives of cyclopenta[c]phenanthrene
Autorzy:
Łuczyński, M. K.
Góra, M.
Mielżyńska, D.
Brzuzan, P.
Tejs, S.
Pirogowicz, P.
Luczynski, M.
Powiązania:
https://bibliotekanauki.pl/articles/363278.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
test Amesa
fenantren
mutacje DNA
WWA
Ames test
phenanthrene
DNA mutations
PAHs
Opis:
The mutagenicity of two, newly synthesized amino-derivatives of cyclopenta[c]phenanthrene (CP[c]Ph) was investigated in the Ames test using TA98 and TA100 histidine dependent Salmonella typhimurium strains. Neither of the examined compounds showed mutagenic activity without metabolic activation. The incorporation of an activation system caused high mutagenicity of CP[c]Ph derivatives in both S. typhimurium strains. The results are compared with the previous data on the mutagenic activity of unsubstituted CP[c]Ph and possible mechanisms of activation are discussed.
Źródło:
Environmental Biotechnology; 2007, 3, 1; 15-19
1734-4964
Pojawia się w:
Environmental Biotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of the convex combination of polynomials
Autorzy:
Góra, M.
Powiązania:
https://bibliotekanauki.pl/articles/970377.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
Hurwitz stability
Schur stability
roots of polynomials
convex combination of polynomials
Opis:
In this paper, we consider the convex combination of polynomials. We provide a necessary and sufficient condition for Hurwitz stability of the convex combination of m real polynomials (m ≥ 3) whose degrees may be different and both necessary, and necessary and sufficient conditions for Hurwitz and Schur stability of the convex combination of two complex polynomials. We show also that the convex combination of two polynomials whose degrees are respectively odd and even, is never Schur stable. We give a few examples completing the results.
Źródło:
Control and Cybernetics; 2007, 36, 2; 425-442
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cathelicidin LL-37, granzymes, TGF-beta1 and cytokines levels in induced sputum from farmers with and without COPD
Autorzy:
Golec, M
Reichel, C.
Mackiewicz, B.
Skorska, C.
Curzytek, K.
Lemieszek, M.
Dutkiewicz, J.
Gora, A.
Ziesche, R.
Boltuc, J.
Sodolska, K.
Milanowski, J.
Spiewak, R.
Powiązania:
https://bibliotekanauki.pl/articles/49729.pdf
Data publikacji:
2009
Wydawca:
Instytut Medycyny Wsi
Tematy:
cathelicidin LL-37
peptide
chronic obstructive pulmonary disease
COPD zob.chronic obstructive pulmonary disease
sputum
farmer
human disease
organic dust
ELISA test
spirometric value
sputum sample
dust exposure
cytokine
lipopolysaccharide
Źródło:
Annals of Agricultural and Environmental Medicine; 2009, 16, 2; 289-297
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nowe znalezisko ciosu mamuta w Karpatach Zachodnich
A new find of mammoth tusk in the Western Carpathians
Autorzy:
Cieszkowski, M.
Zuchiewicz, W.
Alexandrowicz, W. P.
Wojtal, P.
Ślączka, A.
Góra, S.
Fryś, P.
Kursa, G.
Powiązania:
https://bibliotekanauki.pl/articles/2066180.pdf
Data publikacji:
2009
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
ciosy mamuta
Karpaty Zachodnie
Źródło:
Przegląd Geologiczny; 2009, 57, 2; 144-146
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occupational exposure to organic dust, microorganisms, endotoxin and peptidoglycan among plants processing workers in Poland
Autorzy:
Gora, A
Mackiewicz, B.
Krawczyk, P.
Golec, M.
Skorska, C.
Sitkowska, J.
Cholewa, G.
Larsson, L.
Jarosz, M.
Wojcik-Fatla, A.
Dutkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/50063.pdf
Data publikacji:
2009
Wydawca:
Instytut Medycyny Wsi
Tematy:
occupational exposure
organic dust
dust
microorganism
endotoxin
plant processing
worker
Polska
peptidoglycan
bioaerosol
agricultural industry
Źródło:
Annals of Agricultural and Environmental Medicine; 2009, 16, 1; 143-150
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robot przemysłowy w doju krów
Industrial robot in milking of the cows
Autorzy:
Juszka, H.
Kapłon, T.
Tomasik, M.
Góra, K.
Powiązania:
https://bibliotekanauki.pl/articles/239224.pdf
Data publikacji:
2009
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
robot
dój
krowa
symulacja komputerowa
cow
milking
computer simulation
Opis:
Przedstawiono przykład wykorzystania środowiska programistycznego RoboguideŽ SimPRO, służącego do programowania robotów przemysłowych firmy FANUC w doju krów. Zaprojektowano system z jednym robotem przemysłowym obsługującym zakładanie i zdejmowanie kubków udojowych na dwóch stanowiskach udojowych. Przedstawiono wyniki symulacji komputerowej stworzonego programu sterującego.
Paper presents an example of applying RoboguideŽ SimPRO programme environment (provided for programming of FANUC industrial robots) in the process of milking cows. The system with one industrial robot was designed to servicing the installation and removal of teat-cups on two milking stands. Computer simulation results of created steering programme were presented.
Źródło:
Problemy Inżynierii Rolniczej; 2009, R. 17, nr 4, 4; 109-113
1231-0093
Pojawia się w:
Problemy Inżynierii Rolniczej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary evaluation of ER- and AhR-mediated gene expression patterns in rainbow trout (Oncorhynchus mykiss) liver after short-term exposure to zearalenone in binary mixtures
Autorzy:
Woźny, M.
Brzuzan, P.
Wolińska, L.
Góra, M.
Łuczyński, M. K.
Powiązania:
https://bibliotekanauki.pl/articles/363144.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
receptor AhR
benzo(a)piren
ścieżka sygnałowa
17beta-estradiol
receptor estrogenowy
zearalenone
aryl hydrocarbon receptor
benzo(a)pyrene
crosstalk
estrogen receptor
Opis:
While estrogenic properties of mycotoxin zearalenone (ZEA) has been an extensively studied issue, little is known about molecular background of its biological responses that cannot be simply explained by the estrogenic potential. The present study describes effects of ZEA (10mg*kg-1 body weight) in binary mixtures either with benzo[a]pyrene (B[a]P), or with 17β-estradiol (E2) on ER- and AhR-dependent gene expression in juvenile rainbow trout liver, evaluated using Real-Time qPCR. The study revealed dual nature of ZEA, as the treatment with this compound alone increased mRNA levels of both ER- and AhR-mediated gene expression. However, our results did not show any synergistic or additive effect of ZEA in binary mixures with E2 or B[a]P on studied gene expression levels. Whether the intriguing potential of ZEA to elicit distinct signals was a result of binding affinity to AhR or/and ER and AhR mutual receptor interactions, should be investigated in further experiments.
Źródło:
Environmental Biotechnology; 2010, 6, 1; 16-23
1734-4964
Pojawia się w:
Environmental Biotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 47

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