Mitsubishi Chemical Corporation

Kazuhisa Hatakeyama

Hideaki Yukawa

Makoto Nakamura

Masato Terasawa

Yasurou Kurusu

Makoto Goto

Kei Uchiyama

Keiko Kohama

Toshio Uchibori

Michitaka Ise

Provided is a thermally stable bisphenol composition whose increase in the Hazen color number is suppressed even under higher temperature conditions. A bisphenol composition including an aryl alkyl sulfide or a dialkyl disulfide at 0.1 ppb by mass to 1% by mass with respect to a bisphenol. A bisphenol composition including an aryl alkyl sulfide or a dialkyl disulfide at a predetermined ratio is thermally stable in terms of the Hazen color number, and shows no coloring problem under high temperature conditions. By using such a bisphenol composition, a polycarbonate resin having an excellent color tone can be produced.

Bisphenol composition and method for producing same, and polycarbonate resin and method for producing same

The present invention relates to a process for producing L-tryptophan in a single-stage reaction, comprising carrying out an L-tryptophan producing reaction with glycine, formaldehyde and indole as raw materials in an aqueous solution in the presence of microbial cells having serine transhydroxymethylase or a treated products thereof and microbial cells having tryptophan synthase or tryptophanase, or a treated products thereof; and collecting produced L-tryptophan from the reaction solution.

Process for the preparation of L-tryptophan

The present invention relates to a DNA fragment which contains a gene responsible for the function of autonomous replication of plasmid in a Coryneform bacterium, said gene being obtained from plasmid pBY503 held in Brevibacterium stationis, and in which at least one point mutation capable of increasing the copy number of plasmid exists on said gene region. By using a Coryneform transformed with the vector constructed using said DNA fragment and an industrially useful gene such as aspartase gene or tryptophan synthase gene, production of the useful product occurs with higher efficiency than conventional methods.

Coryneform bacteria DNA fragment containing a gene responsible for the

Growing community of inventors

Chiyoda-ku, Japan

Kazuhisa Hatakeyama