Membrane Bioenergetics in Reference to Marine Bacterial Culturability
Understanding of microbial ecology has been expanded by means of isolation, cultivation, and characterization of microorganisms found in natural environments. However, there are still many bacteria which are metabolically active but remain in the so-called “nonculturable” state in nature (44). This state was originally recognized because of the difference observed between direct viable counts and conventional viable counts in seawater (17). Since then, ecological and practical importance of viable but nonculturable cells have been investigated and debated with particular emphasis on Vibrio cholerae and other gram-negative marine bacteria (3, 4, 14, 20, 43, 44). The general features of cells entering the nonculturable state can be summarized as reduction in size (27), decrease in macromolecular synthesis (28), and changes in composition of the cell wall and/or membrane (20, 26). However, little has been investigated with respect to the changes in bioenergetic state.
KeywordsRespiratory Chain Marine Bacterium Light Organ Sodium Pump Luminous Bacterium
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