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Vitamin B12 and Marine Ecology: The Response of Monochrysis Lutheri

Published online by Cambridge University Press:  11 May 2009

M. R. Droop
M. R. Droop
Affiliation:
Marine Station, Millport, Scotland
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Extract

Yield of the supra-littoral chrysomonad Monochrysis lutheri varied directly as vitamin B12 concentration between the limits 0·1 and 100 μμg/ml., each μμg of vitamin supporting 0·55 × 106 cells. Between the same limits of concentration there was to be seen no significant deviation in initial rate of cell division from the mean value of 1·1 divisions per day (phototrophic growth: 2000 lux, 20° and 15° C), the conclusion being that limitation of the division rate does not occur before the concentration vitamin B12 has dropped below 0·1 μμg/ml.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 41 , Issue 1 , February 1961 , pp. 69 - 76
Copyright
Copyright © Marine Biological Association of the United Kingdom 1961

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