SECRETION OF VITAMINS AND AMINO ACIDS INTO THE ENVIRONMENT BY <em>OCHROMONAS DANICAS</em>.

Ochromonas danica grown on a chemically defined medium under controlled conditions in the light synthesized the following vitamins: ascorbate, B[SUB6], N[SUP5]-methyltetrahydrofolate, tetrahydrofolate polyglutamates, oxidized folate monoglutamates, nicotinate, pantothenate, riboflavin, vitamin A, β-carotene, and vitamin E but no vitamin B&sub12]. The cells also secreted molecules into their growth medium including the vitamins ascorbate, B&SUB6], the above folates, nicotinate, pantothenate, riboflavin, vitamin E, and the amino acids alanine, aspartic acid, leucine, and valine. The role of such secretions in nature is discussed. [ABSTRACT FROM AUTHOR]