Graduate Thesis Or Dissertation
 

The effects of hydrostatic pressure and temperature on the uptake and utilization of amino acids by a facultatively psychrophilic marine bacterium

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  • The transport response of four marine psychrophilic bacteria to a variety of substrates was determined and related to environmental conditions. Studies on pressure and temperature effects on glutamic acid transport and utilization indicated that high pressures and low temperatures inhibit glutamate transport, while permitting glutamate respiration. Similar results were obtained for glycine, phenylalanine, and proline. The respiration patterns for all four amino acids differed at 5 C. The differences in pressure effects m respiration is thought to be due to differences in the pressure response of the enzymes of the respiration pathways and not those of the biosynthetic pathways. Pressure effects on the transport systems of all four amino acids were reversible to some degree. Both proline and glutamic acid were able to protect their transport proteins against pressure damage. The significance of these results for pressure studies is discussed.
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