摘要:
The disclosure concerns a process for the microbial preparation of riboflavin by culturing riboflavin-producing microorganisms in a nutrient medium and then isolating the riboflavin which has been produced, which comprises using microorganisms in which the endogenous isocitrate lyase (ICL) activity has been altered.
摘要:
A method is disclosed for preparing 5-ketogluconate, which comprises the steps of: (a) genetically modifying a microorganism capable of microbiologically producing 5-ketogluconate to increase gluconate NADP.sup.+ -5-oxidoreductase gene expression of said microorganism; (b) culturing said microorganism in a medium to produce 5-ketogluconate; and (c) recovering 5-ketogluconate from said medium.
摘要:
A method for the fermentative production of L-isoleucine from D,L-.alpha.-hydroxybutyrate by means of mutants of the genus Corynbecaterium which utilize D-lactate.
摘要:
A method of producing alcohol oxidase wherein Hansenula polymorpha yeast is cultivated in a nutrient broth containing inorganic nutrient salts of which either the phosphate, nitrate or potassium is present in a cell-growth-limiting concentration at a temperature of 25.degree. to 45.degree. C. and a pH of 4.0 to 6.0 with oxygen being supplied as air for a mixture of air and oxygen. According to the invention, an organic substrate consisting of glycerin, sorbite or xylose, noncatabolite-repressive to alcohol-oxidase is added to the broth in a concentration of 0.1 to 1.0% in a nutrient solution at a rate of 0.03 to 0.15 .sup.-1.