1. Protaminobacter alboflavus den Dooren de Jong, 1926. (Thesis, Rotterdam, 1926, 159; also see Cent. f. Bakt., II Abt., 71, 1927, 218.) al.bo.fla'vus. L. adj. alhus white; L. adj. flavus j-ellow; M.L. adj. alboflavus whitish yellow. Rods. Non-motile. Gram-negative. Gelatin colonies: Circular, dry, light yellow or colorless. Gelatin stab: No liquefaction. Agar colonies: Circular, opaque, pigment bright red, yellow, light gray or colorless. Amine agar colonies: Circular, white to dark yellow. See Table I for list of organic substances utilized. Catalase produced. Aerobic, facultative. Optimum temperature, 30° C. Distinctive characters : The author recog- nizes four varieties of this species which he differentiates on the basis of organic sub- stances attacked (see Table) and pigment produced. Variety a shows light yellow growth on gelatin, bright red on agar and yellow on amine agar. Variety' /3 is light 3'el- low on gelatin, yellow on agar and dark yellow on amine agar. Variety y is light yellow on gelatin, light gray on agar and yellow on amine agar. Variety 5 is colorless on gelatin and agar and white on amine agar. Habitat: Soil and water.
2. Protaminobacter ruber den Dooren de Jong, 1926. (Thesis, Rotterdam, 1926, 159; also see Cent. f. Bakt., II Abt., 71, 1927, 218.) ru'ber. L. ruber red. Rods. Motile with a single polar flagellum (Weaver, Samuels and Sherago, Jour. Bact., 35, 1938, 59). Gram-negative. Gelatin colonies: Circular, red, dry. Gelatin stab: No liquefaction. Agar colonies: Circular, red, opaque. Amine agar colonies: Circular, dark red. The following organic acids are attacked: Acetic, lactic, |3-oxybutyric, glycerinic, succinic, malonic, formic, methyl formic, glutaric, maleinic, fumaric, malic, tartaric, citric and quinic. The following amino compounds are
Table I. — Organic Substances Utilized as a Source of Carbon by Varieties (biotypes) of Protaminobacter alboflavus Organic acids: Acetic Valerianic a-crotonic Undecyclic Lactic /3-oxybutyric Succinic Formic Glutaric Adipic Fumaric Malic Tartaric Citric /3-phenj'lpropionic Quinic Amino compounds: a-alanin a-aminocapronic acid Leucin Propionamid Capronamid Uric acid Hippuric acid Alcohol : Ethyl Sugar : Glucose Amines : Ethyl Diethyl Propyl Isopropyl Dipropyl Tripropyl Butyl Isobutyl Diisobutyl Amyl Diamyl Ethanol Glucosamin Benzyl «
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