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Seed survival ofAvena fatua L. var.fatua at various depths (0 to 50 cm) in a degraded chernozem was studied over a period of eight years. Statistical evaluation showed that seeds survived significantly during the first two years at depths of 0 to 20 cm, while at depths of 30 to 50 cm seeds statistically survived in the course of four years. After six years significant withering was observed within the whole soil profile, though 1% of seeds remained viable even until the eighth year. A tendency for prolonged survival of small seeds, and partly of medium ones, was observed in deeper soil layers in the sixth and seventh year. 相似文献
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Marian Buchlovič Zdeněk Kříž Ctirad Hofr Milan Potáček 《Bioorganic & medicinal chemistry》2013,21(5):1078-1081
Novel approach to functionalized polycyclic aromatic hydrocarbons (PAHs) is presented. Incorporation of cyclic nitrone framework into the structure of PAHs was studied with respect to their anti-proliferative activities and interaction with double stranded DNA. Theoretical docking studies and UV titration methods were used for preliminary evaluation of binding of new PAH derivatives to DNA structure. 相似文献
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Ingrid ?kodová Zdeněk Verner Fréderic Bringaud Peter Fabian Julius Luke? Anton Horváth 《Eukaryotic cell》2013,12(12):1664-1673
Glycerol-3-phosphate dehydrogenases (G3PDHs) constitute a shuttle that serves for regeneration of NAD+ reduced during glycolysis. This NAD-dependent enzyme is employed in glycolysis and produces glycerol-3-phosphate from dihydroxyacetone phosphate, while its flavin adenine dinucleotide (FAD)-dependent homologue catalyzes a reverse reaction coupled to the respiratory chain. Trypanosoma brucei possesses two FAD-dependent G3PDHs. While one of them (mitochondrial G3PDH [mtG3PDH]) has been attributed to the mitochondrion and seems to be directly involved in G3PDH shuttle reactions, the function of the other enzyme (putative G3PDH [putG3PDH]) remains unknown. In this work, we used RNA interference and protein overexpression and tagging to shed light on the relative contributions of both FAD-G3PDHs to overall cellular metabolism. Our results indicate that mtG3PDH is essential for the bloodstream stage of T. brucei, while in the procyclic stage the enzyme is dispensable. Expressed putG3PDH-V5 was localized to the mitochondrion, and the data obtained by digitonin permeabilization, Western blot analysis, and immunofluorescence indicate that putG3PDH is located within the mitochondrion. 相似文献
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