Patents Assigned to Tadashi Arai
  • Biological intestinal antiseptics
    Patent number: 4892731
    Abstract: Cells or endospores of a butyric-acid bacterium Clostridium butyricum MII588-Sens 1 strain, or cells or endospores of a butyric-acid bacterium Clostridium butyricum MII588-Res 1 strain are effective as a biological intestinal antiseptic.
    Type: Grant
    Filed: August 9, 1988
    Date of Patent: January 9, 1990
    Assignee: Tadashi Arai
    Inventors: Tadashi Arai, Mamoru Tanaka, Akio Maeda
  • Novel saframycin A derivatives and process for producing the same
    Patent number: 4837149
    Abstract: Disclosed are compounds of the formula ##STR1## wherein R represents hydrogen or C.sub.1 -C.sub.4 -alkyl. These compounds are obtained by fermentation of the known saframycin A producing strain Streptomyces lavendulae No. 314 and by reaction with the amino acids L-tyrosine, L-methionine, glycine and HOOC-(CH)NH.sub.2 -CH.sub.2 -R. When R is hydrogen, saframycin Y.sub.3 and when R is methyl, saframycin Y.sub.d-1 are produced.
    Type: Grant
    Filed: September 22, 1987
    Date of Patent: June 6, 1989
    Assignee: Tadashi Arai
    Inventors: Tadashi Arai, Yuzuru Mikami
  • Antibiotic saframycin S and process for producing the same
    Patent number: 4372947
    Abstract: Antibiotic substance named saframycin S having antibacterial activities and produced by decyanating antibiotic saframycin A or cultivating Streptomyces lavendulae strain No. 314 and recovering saframycin S from a cultured broth.
    Type: Grant
    Filed: September 23, 1980
    Date of Patent: February 8, 1983
    Assignee: Tadashi Arai
    Inventors: Tadashi Arai, Katsuhiro Takahashi, Kimiko Ishiguro, Koji Yokoyama