Graduate Thesis Or Dissertation
 

Some physiological effects of near maximum growth temperatures on an obligately psychrophilic marine bacterium

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  • The heat inactivation of the psychrophilic marine bacterium, Ant-300, was investigated in terms of permeability control, glucose uptake, and respiration. Extensive leakage of 14C-cellular material occurred at 13 C, the maximum growth temperature of the organism. Protein and RNA were released from the cells in significant quantities. Inhibition of glucose uptake also occurred at 13 C when the cells were suspended in artificial seawater. Higher temperatures increased both the rate and extent of inhibition. The presence of nutrients in the cell menstruum afforded some protection to the uptake mechanism against heat injury. In addition, nutrients increased cell viability above the maximum growth temperature. CO₂ evolution at and slightly above the maximum growth temperature appeared to be inhibited more by a limited supply of glucose as substrate than by direct heat damage to the respiratory system. Starvation, resulting from extensive leakage of intracellular material as well as inhibited substrate uptake, was suggested as a cause for the organism's inability to grow at temperatures above 13 C.
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