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[Characteristics of oxygen metabolism in the obligate phototrophic blue-green alga Anabaena variabilis in darkness]. 1975

O Iu Sentsova, and K A Nikitina, and M V Gusev

The rate of endogenous respiration of the cells of Anabaena variabilis in the mineral medium in the darkness decreases gradually during 30 to 40 days and is then maintained at a low level. The rate of oxygen uptake was the same in the cells grown in aerobic and anaerobic conditions in the darkness. The ability for oxygen evolution in the light is maintained in the anaerobic cells for a longer time, and the biomass yield and the content of phycocyanin in the cells decrease at a lower rate in anaerobic conditions. Therefore, under certain conditions of the medium, the processes related to the cell survival in the darkness are directed to preserve the photosynthesizing apparatus, and oxygen is a factor accelerating the death while anaerobic conditions delay destruction of the cells in the darkness.

UI MeSH Term Description Entries
D010101 Oxygen Consumption The rate at which oxygen is used by a tissue; microliters of oxygen STPD used per milligram of tissue per hour; the rate at which oxygen enters the blood from alveolar gas, equal in the steady state to the consumption of oxygen by tissue metabolism throughout the body. (Stedman, 25th ed, p346) Consumption, Oxygen,Consumptions, Oxygen,Oxygen Consumptions
D010798 Phycocyanin The metal-free blue phycobilin pigment in a conjugated chromoprotein of blue-green algae. It functions as light-absorbing substance together with chlorophylls. C-Phycocyanin,C Phycocyanin
D002734 Chlorophyll Porphyrin derivatives containing magnesium that act to convert light energy in photosynthetic organisms. Phyllobilins,Chlorophyll 740
D003624 Darkness The absence of light. Darknesses
D000332 Aerobiosis Life or metabolic reactions occurring in an environment containing oxygen. Aerobioses
D000458 Cyanobacteria A phylum of oxygenic photosynthetic bacteria comprised of unicellular to multicellular bacteria possessing CHLOROPHYLL a and carrying out oxygenic PHOTOSYNTHESIS. Cyanobacteria are the only known organisms capable of fixing both CARBON DIOXIDE (in the presence of light) and NITROGEN. Cell morphology can include nitrogen-fixing heterocysts and/or resting cells called akinetes. Formerly called blue-green algae, cyanobacteria were traditionally treated as ALGAE. Algae, Blue-Green,Blue-Green Bacteria,Cyanophyceae,Algae, Blue Green,Bacteria, Blue Green,Bacteria, Blue-Green,Blue Green Algae,Blue Green Bacteria,Blue-Green Algae
D000693 Anaerobiosis The complete absence, or (loosely) the paucity, of gaseous or dissolved elemental oxygen in a given place or environment. (From Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed) Anaerobic Metabolism,Anaerobic Metabolisms,Anaerobioses,Metabolism, Anaerobic,Metabolisms, Anaerobic

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