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Contributing carbohydrate catabolic pathways in Cyclobacterium marinus

The primary and secondary pathways of carbohydrate metabolism were determined in a nonfermentative gram-negative ring-forming marine bacterium, Cyclobacterium marinus, by radiorespirometric studies. Whereas glucose is oxidized mainly via the Embden-Meyerhof pathway, gluconate is catabolized mainly via the Entner-Doudoroff pathway, both in conjunction with the tricarboxylic acid cycle as a secondary pathway and with some participation of the pentose phosphate pathway. The operation of these contributing catabolic pathways in this unique marine bacterium was substantiated by assaying the activities of the key enzymes specific to each pathway.