THE EXTRACELLULAR RELEASE Of GLYCOLIC ACID BY A MARINE DIATOM1
作者:
Walker O. Smith,
期刊:
Journal of Phycology
(WILEY Available online 1974)
卷期:
Volume 10,
issue 1
页码: 30-33
ISSN:0022-3646
年代: 1974
DOI:10.1111/j.1529-8817.1974.tb02674.x
出版商: Blackwell Science Inc
数据来源: WILEY
摘要:
SUMMARYThe excretion of glycolic acid by the marine diatomChaetoceros socialisthrough time was studied. Excretion in axenic cultures was linear for the time intervals used, but for nonaxenic cultures an equilibrium was created, suggesting bacterial uptake of glycolic acid. In studies with an inhibitor of glycolate dehydrogenase, the level of glycolic acid in the medium jumped 15–fold. This shows the presence of this enzyme, and implies the presence of the entire set of enzymes which convert glycolic acid to serine and release carbon dioxide. In both axenic and nonaxenic cultures a steady state was reached. All of the data suggest that at high cell densities glycolic acid is liberated from the cell by a passive mechanism. The effect of such an excretion in natural waters is discusse
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