摘要:
Disclosed is a process for producing L-threonine, which comprises culturing an L-threonine-producing microorganism belonging to the genus Escherichia and having a resistance to at least one of L-phenylalanine and L-leucine in a medium until L-threonine is produced and accumulated in the culture, and recovering L-threonine therefrom.
摘要:
The invention relates to a bacterial process for producing L-tryptophan, L-tyrosine or L-phenylalanine. The process utilizes a coryneform glutamic acid-producing bacterium being capable of producing L-tryptophan, L-tyrosine or L-phenylalanine and also decreased or lacked in phosphoenolpyruvate carboxylase activity. The mutant strain is then cultured in order to accumulate the amino acid in a medium and the amino acid is recovered therefrom.
摘要:
A fermentation process is disclosed for producing L-glutamic acid in high yield using microorganisms belonging to the genus Corynebacterium or Brevibacterium having the ability to produce L-glutamic acid and which have or have been endowed with a resistance to a-naphthoquinone, a resistance to antibiotics of the type which inhibit energy metabolism, or a resistance to precursors in the biosynthesis of ubiquinone.
摘要:
Disclosed is a process for producing L-leucine which comprises culturing in a medium a microorganism belonging to the genus Escherichia and having resistance to a leucine analogue and an ability to produce L-leucine, allowing L-leucine to accumulate in the culture, recovering L-leucine therefrom.
摘要:
Disclosed is a process for producing d-isocitric acid which comprises culturing in a medium a microorganism until d-isocitric acid is accumulated in the culture, and recovering d-isocitric acid therefrom, said microorganism belonging to the genus Candida , having resistance to monofluoroacetic acid, being incapable of growing or capable of growing only poorly in the presence of d-isocitric acid as a sole carbon source, and being capable of producing d-isocitric acid.
摘要:
A fermentation process is disclosed for producing L-glutamic acid in high yield using microorganisms belonging to the genus Corynebacterium or Brevibacterium having the ability to produce L-glutamic acid and which have or have been endowed with a resistance to one or more antibiotics of the type which inhibit energy metabolism and selected from oligomycin, antimycin A, rutamycin, and valinomycin.
摘要:
The present invention provides a process for producing an L-amino acid which comprises culturing in a nutrient medium a microorganism which is capable of producing the L-amino acid and which can not grow in a synthetic medium containing said L-amino acid as the sole nitrogen source in an amount of 5 mg/ml or below, allowing the L-amino acid to accumulate in the culture, and recovering the L-amino acid from the culture.