the type strain of s halstedii atcc 10897 was used for comparison both cultures agree with each other in the following properties morphology of spore chains morphology of spore surface negative melanin production and most of the biochemical properties culture n393 39 differs from s halstedii in the absence of arial mycelium on many media brownish rather than grayish to black colony reverse on isp 2 isp 3 and isap 4 media negative h 2 s production and inability to utilize fructose since these differences are merely minor variations among strains of a streptomyces species n393 39 is considered as a new strain of streptomyces halstedii waksman and curtis waksman and henrici the new culture pfizer n393 39 was submitted on feb 23 1981 to the american type culture collection rockville md and given the designation streptomyces halstedii atcc 31812 the permanency of the deposit of this culture at the american type culture collection at rockville md and ready accessibility thereto by the public are afforded throughout the effective life of the patent in the event the patent is granted access to the culture is available during pendency of the application under 37 cfr 1 14 and 35 usc 112 all restrictions on the availability to the public of.