998 resultados para Flavobacterium columnare G4
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von M. Präger
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y. l. ʿal pi kitve yad ʿim mavo ṿe-heʿarot ʿa. y. Yaʿaḳov Ḳopel Dushinsḳi
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Eocene diatom and silicoflagellate complexes from deposits of the Kronotsky Bay are presented. Pro tempore they are the most ancient finds of fossil phytoplankton with silica skeletons in the Northwest Pacific. More than 130 diatom species belonging to 59 genera and 24 silicoflagellate species belonging to 5 genera have been determined. Three Middle Eocene complexes (of the Lisitzinia kanayai, Lisitzinia inconspicua var. trilobata, and Praecymatosira monomembranaceae zones) and one presumably Middle-Late Eocene complex (of the zone with Rylandsia conniventa) of diatoms have been identified. For the first time a large silicoflagellate complex attributable to the Dictyocha hexacantha zone is presented. It is assumed that the complexes formed mainly in bathyal conditions at relatively high (close to sub-tropical) temperatures of surface waters.
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The microbial population in samples of basalt drilled from the north of the Australian Antarctic Discordance (AAD) during Ocean Drilling Program Leg 187 were studied using deoxyribonucleic acid (DNA)-based methods and culturing techniques. The results showed the presence of a microbial population characteristic for the basalt environment. DNA sequence analysis revealed that microbes grouping within the Actinobacteria, green nonsulfur bacteria, the Cytophaga/Flavobacterium/Bacteroides (CFB) group, the Bacillus/Clostridium group, and the beta and gamma subclasses of the Proteobacteria were present in the basalt samples collected. The most dominant phylogenetic group, both in terms of the number of sequences retrieved and the intensities of the DNA bands obtained with the denaturing gradient gel electrophoresis analysis, was the gamma Proteobacteria. Enrichment cultures showed phylogenetic affiliation with the Actinobacteria, the CFB group, the Bacillus/Clostridium group, and the alpha, beta, gamma, and epsilon subclasses of the Proteobacteria. Comparison of native and enriched samples showed that few of the microbes found in native basalt samples grew in the enrichment cultures. Only seven clusters, two clusters within each of the CFB and Bacillus/Clostridium groups and five clusters within the gamma Proteobacteria, contained sequences from both native and enriched basalt samples with significant similarity. Results from cultivation experiments showed the presence of the physiological groups of iron reducers and methane producers. The presence of the iron/manganese-reducing bacterium Shewanella was confirmed with DNA analysis. The results indicate that iron reducers and lithotrophic methanogenic Archaea are indigenous to the ocean crust basalt and that the methanogenic Archaea may be important primary producers in this basaltic environment.
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Nouiter impressi ac alme correcti, cum reportorio
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Sign.: []8, a-c8, d4, e-i8, k10, 2a-2d8, 2e6, 2f-2g8, 2h6, A-F8, G4, H-I8, K4, 4a8, 4b10, 4c8, 4d10, 4e4, 2[alfa]-2[delta]8, 2[épsilon]4
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Sign.: []8, a-c8, d4, e-i8, k10, 2a-2d8, 2e6, 2f-2g8, 2h6, A-F8, G4, H-I8, K4, 4a8, 4b10, 4c8, 4d10, 4e4, 2[alfa]-2[delta]8, 2[épsilon]4
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Capitulares grab. xil.
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Marca tip. en G4r (Vindel, 28)
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Marca tip. en 2M7v (Vindel, 29)
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Apendice en español
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Sign.: a-c4, e-g4, A-Z4, Aa-Oo4