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多抗霉素产生菌的选育 1971年初,我们用金色产色链霉菌4·896野生型原种上罐发酵二十几批,发酵单位不高,而且不稳定。当时使用丝孢酵母A.S2·571做指示菌测定效价。所测定出的产品效价单位在生产上使用时,防治烟草赤星病的效果悬殊很大,也很不稳定。从4·896
Breeding of Polyoxin Producing Bacteria In early 1971, we fermented over 20 batches of fermentative strains of Streptomyces griseoflavus 4.8696 wild-type seedlings. The fermentation unit was not high and unstable. At that time the use of T. solani A.S2 · 571 do indicator bacteria titer. When the measured titer unit of the product is used in production, the effect of preventing and controlling tobacco brown spot disease is very great and unstable. From 4.886