Abstract
This paper is concerned with the effect of vitamin B12 on the growth of the halophilic marine yeast, Rhodotorula glutinis var. salinaria, particularly with respect to the utilization of inorganic nitrogen sources in saline media of different hypertonicities. At a concentra-tion of 1×10-5 M, vitamin B12 was inhibitory to growth and markedly so in salt media con-taining NO3-but no Mo ions. In non-saline media, the inhibition was less marked than in salt media and NH4+ was utilized more effectively than N03-. Tween 80 could be sub-stituted for glucose as the carbon source but less effectively. The significance of vitamin B12 for the process of inorganic nitrogen reduction to probably amino acid could be evaluated, but more precisely must await further evidence to evaluate.
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