The following information, as revealed in these studies, is claimed to be a contribution to knowledge. A bacterium and a fungus identified as a Pseudomonas sp. and a Penicillium sp. were isolated by the soil perfusion enrichment technique, and are able to utilize phloroglucinol as the sole carbon source in a medium containing various inorganic salts. [...]

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The requirement of marine bacteria for seawater in the medium for growth has been observed to reflect their need for the inorganic ions in seawater for their growth and metabolism. Of these inorganic ions, the marine bacteria so far examined in contrast to most terrestrial bacterial species have been found to possess a specific requirement for Na+ for growth. The Na+ requirement for growth has been found to reflect a requirement for the transport of nutrients in marine bacterial cells. This and other information regarding the characteristics of marine bacteria have come from the studies of only a few representatives of a very small fraction of the bacterial population in the sea, and one may well ask how far these observations made with a few species are true for marine bacteria as a group of organisms? In this thesis observations made on non-luminous marine bacteria have been extended to include some representative luminous marine bacteria. In the course of these studies some similarities and differences in the nutrition and metabolism of the two groups of organisms have been noted.

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