Secretion of Vitamins and Amino Acids Into the Environment Byochromonas Danica¹,²

SUMMARY Ochromonas danica grown on a chemically defined medium under controlled conditions in the light synthesized the following vitamins: ascorbate, B 6 , N 5 ‐ methyltetrahydrofolate, tetrahydrofolate polyglutamates, oxidized folate monoglutamates, nicotinate, pantothenate, riboflavin, vitamin A, β‐carotene, and vitamin E but no vitamin. B 12 . The cells also secreted molecules into their growth medium including the vitamins ascorbate, B 6 , 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.