Abstract
Rates of oxygen uptake and the oxygen demand during growth of Candida tropicalis on hexadecane and glucose were determined in batch experiments. Oxygen demand was 2.5 fold higher for the synthesis of one unit of cell mass from hydrocarbon than from glucose. On the other hand specific respiration is of the same order of magnitude for both substrates, e.g. 12 mmoles O2xh-1xg-1 (dry weight) and seems to be a constant of this organism. Higher rates of oxygen supply into the medium had no effect on the specific rates of respiration. Specific growth rates on hexadecane were 2.4 times lower than on glucose. It is concluded, that rates of synthesis of cell components are controlled by the overall capacity of the respiratory pathways.
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