An actinomycete able to produce an extracellular adenosine deaminase catalyzing the conversion of adenosine to inosine by the deamination was isolated from soil samples. Examinations were made through the microscopic observation of shape, color
of
aerial and substrate mycelium, presence of soluble pigments, and assimilation of sugars. As the results obtained, the isolate showed good growth on the known test-media used for the classification of actinomycetes, and did simpy branched-aerial
hyphae
with white color in general. The spore-bearing hyphae of isolate possessed spore chain and the color of substrate was brown, or yellow. Soluble pigments were also produced.
The isolate produced the melanin pigment on peptone-yeast extractiron agar and presented high level of activity in gelatin liquefaction and nitrate reduction. From the above characteristics and the presence of ..-diaminopimelic acid as component
of
cell
wall, she was identified genus Streptomyces and named Streptomyces sp. Y-225.
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