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Wyszukujesz frazę "1-dependence" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Polarization angle dependence of stark absorption spectra of spirilloxanthin bound to the reconstituted LH1 complexes using LH1-subunits isolated from the purple photosynthetic bacterium Rhodospirillum rubrum
Autorzy:
Horibe, Tomoko
Nakagawa, Katsunori
Kusumoto, Toshiyuki
Fujii, Ritsuko
Cogdell, Richard
Nango, Mamoru
Hashimoto, Hideki
Powiązania:
https://bibliotekanauki.pl/articles/1039786.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
spirilloxanthin
Rhodospirillum rubrum
Stark absorption spectroscopy
polarization angle dependence
reconstitution
carotenoid
LH1 complex
Opis:
Reconstituted LH1 complexes were prepared using the LH1 subunit-type complexes, isolated from the purple photosynthetic bacterium Rhodospirillum (Rs.) rubrum, and purified all-trans spirilloxanthin. Stark absorption spectra of spirilloxanthin bound to both the native and reconstituted LH1 complexes were compared in different polarization angles (χ) against the external electric field. From the polarization angle dependence of the Stark absorption spectra, two angles were determined in reference to the direction of transition dipole moment (m) of spirilloxanthin: one is the change in polarizability upon photoexcitation (Δα), θΔα and the other is the change in static dipole moment upon photoexcitation (Δμ), θΔμ. Despite the symmetric molecular structure of all-trans spirilloxanthin, its Stark absorption spectra show pronounced values of Δμ. This large Δμ values essentially caused by the effect of induced dipole moment through Δα both in the cases for native and reconstituted LH1 complexes. However, slightly different values of θΔα and θΔμ observed for the native LH1 complex suggest that spirilloxanthin is asymmetrically distorted when bound to the native LH1 complex and gives rise to intrinsic Δμ value.
Źródło:
Acta Biochimica Polonica; 2012, 59, 1; 97-100
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On 1-dependent ramsey numbers for graphs
Autorzy:
Cockayne, E.
Mynhardt, C.
Powiązania:
https://bibliotekanauki.pl/articles/744249.pdf
Data publikacji:
1999
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
1-dependence
irredundance
CO-irredundance
Ramsey numbers
Opis:
A set X of vertices of a graph G is said to be 1-dependent if the subgraph of G induced by X has maximum degree one. The 1-dependent Ramsey number t₁(l,m) is the smallest integer n such that for any 2-edge colouring (R,B) of Kₙ, the spanning subgraph B of Kₙ has a 1-dependent set of size l or the subgraph R has a 1-dependent set of size m. The 2-edge colouring (R,B) is a t₁(l,m) Ramsey colouring of Kₙ if B (R, respectively) does not contain a 1-dependent set of size l (m, respectively); in this case R is also called a (l,m,n) Ramsey graph. We show that t₁(4,5) = 9, t₁(4,6) = 11, t₁(4,7) = 16 and t₁(4,8) = 17. We also determine all (4,4,5), (4,5,8), (4,6,10) and (4,7,15) Ramsey graphs.
Źródło:
Discussiones Mathematicae Graph Theory; 1999, 19, 1; 93-110
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Event-related potentials (ERP) and SGIP1 gene polymorphisms in alcoholics: relation to family history of alcoholism and drug usage
Autorzy:
Chwedorowicz, Roman
Raszewski, Grzegorz
Kapka-Skrzypczak, Lucyna
Sawicki, Krzysztof
Studziński, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/991182.pdf
Data publikacji:
2016
Wydawca:
Instytut Medycyny Wsi
Tematy:
alcohol dependence
event-related potentials
resting theta eeg power
sgip1 snps
Opis:
Objective. The electrophysiological characteristics may serve as valuable biomarkers for the genetic vulnerability underlying alcoholism. The purpose of this study was to evaluate the potential associations between single nucleotide polymorphisms (SNPs) located in the SGIP1 gene and the theta ERP quantitative traits. Method. The theta band (4–7 Hz) visual ERP occurring in the P300 response in the resting EEG were examined to explore the electrophysiological effects of alcohol on the brain in five regions: frontal, central, parietal, temporal and occipital in patients with alcohol addiction. In addition, we tested the potential associations between single nucleotide polymorphisms (SNPs) located in the SGIP1 gene and ERP quantitative traits. Results. We found that the amplitude of the auditory P300 response differed considerably among groups of alcoholics in the frontal, central and temporal areas of the brain and it was lower in the studied brain regions in alcoholics in comparison to non-alcoholics. However, among subjects in the young adult group (GR-1) there was no statistical difference in amplitude of P300 response with control subjects in all studied brain regions in comparison with non-alcoholics. Moreover, we revealed that SNP rs10889635 had a significant effect on P300 amplitude in the central and temporal regions. The reduced P300 amplitude was in AA carriers in comparison to both carriers of GG and GA alleles. Conclusion. The present study demonstrated a possible association of target P300 evoked theta and of alcohol dependence with SNPs from the gene SGIP1 in the region of rs10889635, but further studies are required.
Źródło:
Annals of Agricultural and Environmental Medicine; 2016, 23, 4
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the frequency of the transforming growth factor beta-1 sequence polymorphisms in patients with alcohol dependence syndrome
Autorzy:
Augustyńska, Beata
Araszkiewicz, Aleksander
Woźniak, Marcin
Grzybowski, Tomasz
Skonieczna, Katarzyna
Woźniak, Alina
Żyła, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/1039134.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
transforming growth factor TGFβ-1
alcohol dependence syndrome
TGF-β1 gene
Opis:
Alcohol abuse is one of the most significant factors in the development of liver fibrosis. The pathomechanism of liver fibrosis is the same regardless of its etiology. Fibrosis is a sign of an imbalance between the synthesis of the extracellular matrix components and their degradation. Among the many cytokines that affect hepatic stellate cell activation it seems that transforming growth factor beta (TGF-β) is the most significant, either as the direct factor stimulating polymerase chain reaction (HSC) proliferation and transformation into myofibroblasts, or as the direct factor causing an increase in the activity of genes responsible for the synthesis of extracellular matrix components. The aim of the study was to reveal possible dependencies and differences between the presence of certain alleles of the TGF-β1 gene and its blood level in the study and control group. Blood samples were obtained from 39 patients, the control group consisted of 21 patients. The results obtained in the course of this study showed no statistically significant differences between the frequencies of particular polymorphisms. In the case of haplotype frequencies, insignificant differences were found for the algorithm Excoffier-Laval-Balding predicted haplotypes while one significant difference between the study and control groups was detected in case of the TC haplotype frequency predicted using the Expectation-Maximization algorithm. However, the difference in frequency of TC haplotype predicted by both algorithms was not significant. Genetic analysis of two single nucleotide polymorphisms (SNPs) in exon I of the TGF-β1 gene did not show significant differences between the occurrence of particular polymorphisms and haplotypes in the populations under study.
Źródło:
Acta Biochimica Polonica; 2015, 62, 1; 63-67
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
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