Toray Industries, Inc.

Kyousuke Yotsumoto

Katsushige Yamada

Hiromi Tsutsui

Makoto Shirai

Tetsu Yonehara

Masae Takeuchi

Reiko Miyata

Motojiro Goto

Minoru Hinoura

Higher amount of L-threonine can be accumulated by the cultivation of certain microorganism belonging to the genus Providencia, having a resistance to methionine antagonist and having capabilities of producing L-threonine.

Process for producing L-threonine by fermentation with P. rettgeri.

Microorganisms belonging to the genus Providencia or the genus Escherichia and having a resistance to isoleucine antagonist, produce L-threonine by fermentation in higher yield and in more amount of L-threonine accumulated.

Process for producing L-threonine by fermentation

Microorganisms belonging to the genus Providencia the species rettgeri at least leucine for the growth thereof, produce L-threonine by fermentation in higher yield and with increased amount of L-threonine accumulated.

Method for producing pyruvic acid by fermentation

Metal ions, for example, heavy metal ions, alkaline earth metal ions and aluminium ions are eliminated by bringing a liquid containing the metal ions into contact with a special chelate resin in which chelating carboxylic anion groups are associated with basic amino acid cations, for example, lysine, ornithine, histidine, arginine, .alpha.,.beta.-diaminopropionic acid, .alpha.,.gamma.-diaminobutyric acid, L-citrulline and .delta.-oxylysine.

Growing community of inventors

Aichi, Japan

Kyousuke Yotsumoto