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A Temperature Dependence of the Intra- and Extracellular Fatty-Acid Composition of Green Algae and Cyanobacterium / N. N. Sushchik [et al.] // Russian Journal of Plant Physiology. - 2003. - Vol. 50, Is. 3. - P374-380, DOI 10.1023/A:1023830405898 . - ISSN 1021-4437
Кл.слова (ненормированные):
Cyanobacterium -- Fatty acids -- Green algae -- Lipids -- Secretion -- algae -- Bacteria (microorganisms) -- Botryococcus braunii -- Chlorella vulgaris -- Chlorophyta -- Eukaryota -- Prokaryota -- Spirulina -- Spirulina platensis
Аннотация: The effect of ambient temperature on the composition of intracellular fatty acids and the release of free fatty acids (FFA) into a medium by cyanobacterium Spirulina platensis and eukaryotic microalgae, Chlorella vulgaris and Botryococcus braunii, was studied using their batch cultures. It was found that all the species studied, regardless of their taxonomic status, responded to the temperature regime by similar changes in their intracellular fatty acid composition: the relative content of more unsaturated fatty acids decreased with the elevation of temperature. At the same time, in the prokaryote, this temperature shift blocked, first of all, the elongation of 16: 0 to 18:0 and then their further desaturation. In eukaryotes, the change in the desaturation of dienoic to trienoic fatty acids was the most pronounced process. The ratio of dienoic to trienoic fatty acids remained almost unchanged in S. platensis. The relative content of extracellular unsaturated FFA increased in the prokaryotic organism S. platensis at a higher temperature. But no significant changes in the composition of extracellular unsaturated FFA were detected in eukaryotic algae upon temperature elevation.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Sushchik, N.N.; Kalacheva, G.S.; Zhila, N.O.; Gladyshev, M.I.; Volova, T.G.

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Seasonal dynamics of amino acids in two small Siberian reservoirs dominated by prokaryotic and eukaryotic phytoplankton / G. S. Kalachova [et al.] // Aquatic Ecology. - 2004. - Vol. 38, Is. 1. - P3-15, DOI 10.1023/B:AECO.0000021044.55658.71 . - ISSN 1386-2588
Кл.слова (ненормированные):
Amino acids -- Blooms -- Cyanobacteria -- Phytoplankton -- amino acid -- biomass -- phytoplankton -- reservoir -- seasonal variation -- Eurasia -- Siberia -- Cyanobacteria -- Eukaryota -- Prokaryota
Аннотация: The comparison of the dynamics of phytoplankton biomass and total amino acid composition was made for two water bodies: in one the phytoplankton were dominated by prokaryotes (i.e., there was a bloom of cyanobacteria) and by eukaryotic microalgae in the other. The dynamics of phytoplankton biomass and of total amino acid composition of water were investigated during the vegetation season. It was found that the only factor that significantly changed the percentages of amino acids in water was the bloom of cyanobacteria in the "blooming" water body. During the bloom of cyanobacteria, the absolute and relative content of the Leu-Glu group increased, while the contents of other acids generally dropped. Before and after the bloom, no significant variations in the total amino acid composition were recorded. In the reservoir where eukaryotic microalgae dominated, no significant variations in amino acid composition were recorded during the season.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State University, Svobodny av. 79, Krasnoyarsk, 660041, Russian Federation
Krasnoyarsk State Agric. University, Mira av., 88, Krasnoyarsk, 660049, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Kalachova, G.S.; Kolmakova, A.A.; Gladyshev, M.I.; Kravchuk, E.S.; Ivanova, E.A.

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Phylogenetic diversity of winter bacterioplankton of eutrophic Siberian reservoirs as revealed by 16S rRNA gene sequences / M. Yu. Trusova, M. I. Gladyshev // Microbial Ecology. - 2002. - Vol. 44, Is. 3. - P252-259, DOI 10.1007/s00248-002-2020-1 . - ISSN 0095-3628
Кл.слова (ненормированные):
bacterioplankton -- community composition -- community dynamics -- genetic variation -- phylogenetics -- reservoir -- winter -- Russian Federation -- Actinobacteria -- Bacteria (microorganisms) -- Bacteroides -- Betaproteobacteria -- Cyanobacteria -- Cytophaga -- Flavobacterium -- Prokaryota -- Proteobacteria -- bacterial DNA -- fresh water -- RNA 16S -- animal -- article -- bacterium -- chemistry -- DNA sequence -- genetic variability -- genetics -- microbiology -- molecular genetics -- phylogeny -- plankton -- Russian Federation -- season -- Animals -- Bacteria -- DNA, Bacterial -- Fresh Water -- Molecular Sequence Data -- Phylogeny -- Plankton -- RNA, Ribosomal, 16S -- Seasons -- Sequence Analysis, DNA -- Siberia -- Variation (Genetics)
Аннотация: Using 16S rRNA gene sequence analyses we investigated the bacterial diversity of winter bacterioplankton of two eutrophic Siberian reservoirs. These reservoirs show similarity in phytoplankton community composition in spring and autumn but tend to differ in summer in exhibiting cyanobacterial bloom. Forty-eight unique partial 16S RNA gene sequences retrieved from two libraries were mostly affiliated with the class Actinobacteria, ? subdivision of the class Proteobacteria, and the phylum Cytophaga-Flavobacterium-Bacteroides. The clone library of the pond exhibiting summer cyanobacterial bloom showed more diversity in sequence composition. A significant number of bacterial 16S rRNA gene clones were closely related to freshwater bacteria previously found in different aquatic ecosystems. This finding confirms the assumption that some bacterial clades are globally distributed.

Scopus
Держатели документа:
Inst. of Biophys. of Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Trusova, M.Yu.; Gladyshev, M.I.

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