Photosynthetic Activity during the Division Cycle in Synchronized Euglena gracilis
نویسندگان
چکیده
منابع مشابه
Photosynthetic activity during the division cycle in synchronized Euglena gracilis.
Axenic populations of the photosynthetic protozoan Euglena gracilis, grown with autotrophic nutrition, were synchronized with respect to cell division by culture on an alternating light-dark cycle. No cell divisions occurred in the light periods; approximately 100% of the cells divided in the dark periods. In such cultures, the synthesis of photosynthetic pigments and accumulation of polysaccha...
متن کاملPhotosynthetic products of division synchronized cultures of euglena.
Rates and products of photosynthetic (14)CO(2) fixation by division synchronized cultures of Euglena gracilis strain Z were determined over the cycle. Rate of (14)CO(2) fixation doubled in a continuous manner throughout the light phase followed by a slight reduction of photosynthetic capacity in the dark phase. Greater (14)C incorporation into the nucleic acid-polysaccharide fraction occurred w...
متن کاملPeriodic Increase in Deoxyribonuclease Activity during the Cell Cycle in Synchronized Euglena
The deoxyribonucleases have numerous biological functions in cellular growth and development (1-3) . These include repair mechanisms for damaged DNA molecules, protective mechanisms against viral infection, promotion by viral DNases of intracellular viral growth, and intracellular digestive functions carried out by acid nucleases located in the lysosomes . Accumulating evidence indicates that a...
متن کاملThe ultrastructure of cell division in Euglena gracilis.
The ultrastructure of mitosis in Euglena gracilis was investigated. At preprophase the nucleus migrates anteriorly and associates with the basal bodies. Flagella and basal bodies replicate at preprophase. Cells retain motility throughout division. The reservoir and the prophase nucleus elongate perpendicular to the incipient cleavage furrow. One basal body pair surrounded by a ribosome-free zon...
متن کاملEvidence of Reentrance of Glycolate Carbon into the Photosynthetic Carbon Reduction Cycle in Photosynthesizing Euglena gracilis Z.
Aminooxyacetate induced excretion of glycolate from air-grown cells of Euglena gracilis in both air and 1% CO(2) atmospheres. The rate of the excretion reached 70% of the photosynthetic rate in the air on a carbon basis, and was 10% in 1% CO(2). The compulsory loss of photosynthetically fixed carbon as glycolate at the high rate in air in the presence of aminooxyacetate caused a decrease of the...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1966
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.41.5.821