NUTRITIONAL REQUIREMENTS OF ARTHROBACTER TERREGENS

Abstract
Vitamin and amino acid requirements have been established for Arthrobacter terregens n. sp., an organism found to require an unknown growth factor present in soil extract, liver extract, and culture filtrates of Arthobacter pascens n. sp. Apart from this unknown factor, concentrates of which promote growth at less than 0.1 μgm. per ml., biotin, thiamine, and pantothenic acid were found to be essential. With adequate mineral supplement the nitrogen requirements could be fulfilled by l-glutamic acid, though the latter could be replaced by combinations of other amino acids.

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