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Yasumasa Koyama

Chiba University

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Publication

Featured researches published by Yasumasa Koyama.

Chemical & Pharmaceutical Bulletin | 1984

Elucidation of the structure of olivoretin A and D (teleocidin B).

Shin-ichiro Sakai; Norio Aimi; Keiichi Yamaguchi; Yukio Hitotsuyanagi; Chitoshi Watanabe; Kazuteru Yokose; Yasumasa Koyama; Koichi Shudo; Akiko Itai

Chemical & Pharmaceutical Bulletin | 1984

SYNTHESIS OF OPTICALLY ACTIVE TELEOCIDIN DERIVATIVES. ABSOLUTE CONFIGURATION OF TELEOCIDIN B AND OLIVORETIN A

Yasuyuki Endo; Koichi Shudo; Kimio Furuhata; Haruo Ogura; Shin-ichiro Sakai; Norio Aimi; Yukio Hitotsuyanagi; Yasumasa Koyama

Journal of Bacteriology | 1967

Antimicrobial activity of aflatoxins.

Tadashi Arai; Tatsuya Ito; Yasumasa Koyama

Chemical & Pharmaceutical Bulletin | 1984

ELUCIDATION OF THE STRUCTURES OF OLIVORETIN B AND C

Yukio Hitotsuyanagi; Keiichi Yamaguchi; Koreharu Ogata; Norio Aimi; Shin-ichiro Sakai; Yasumasa Koyama; Yasuyuki Endo; Koichi Shudo; Akiko Itai; Yoichi Iitaka

Chemical & Pharmaceutical Bulletin | 1975

Application of 13C-NMR to the Biosynthetic Investigations. II. Biosynthesis of Aureothin and Related Nitro-containing Metabolites of Streptomyces luteoreticuli

Mikio Yamazaki; Yukio Maebayashi; Humio Katoh; Junichi Ohishi; Yasumasa Koyama

Journal of pharmacobio-dynamics | 1987

INHIBITION OF MUTAGENICITY BY GLYCYRRHIZA EXTRACT AND GLYCYRRHIZIN

Michiyasu Tanaka; Nobuyuki Mano; Emiko Akazai; Yasuko Narui; Fumio Kato; Yasumasa Koyama

Chemical & Pharmaceutical Bulletin | 1986

The structures of additional teleocidin class tumor promoters.

Shin-ichiro Sakai; Yukio Hitotsuyanagi; Keiichi Yamaguchi; Norio Aimi; Koreharu Ogata; Tadao Kuramochi; Hiroko Seki; Ritsuko Hara; Hirota Fujiki; Masami Suganuma; Takashi Sugimura; Yasuyuki Endo; Koichi Shudo; Yasumasa Koyama

Journal of General and Applied Microbiology | 1963

INFRARED ABSORPTION SPECTRA OF WHOLE CELLS OF NOCARDIA AND RELATED ORGANISMS

Tadashi Arai; Shyuko Kuroda; Yasumasa Koyama

Tetrahedron Letters | 1972

Study of biosynthesis of aureothin, a nitro-containing metabolite from Streptomyces Luteoreticuli using 13C-NMR spectrometry

Mikio Yamazaki; Fumio Katoh; Jun-ichi Ohnishi; Yasumasa Koyama

Tetrahedron Letters | 1969

The structure of luteoreticulin, a nitro-containing metabolite of streptomyces luteoreticuli

Yasumasa Koyama; Yuichi Fukakusa; Nobuo Kyomura; Saburo Yamagishi; Tadashi Arai

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Fumio Kato

Chiba University

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Saburo Yamagishi

Chiba University

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Tadashi Arai

Chiba University

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Koichi Shudo

University of Tokyo

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Michiyasu Tanaka

Chiba University

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Norio Aimi

Chiba University

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Shin-ichiro Sakai

Chiba University

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Yukio Hitotsuyanagi

Tokyo University of Pharmacy and Life Sciences

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Keiichi Yamaguchi

Chiba University

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Mikio Yamazaki

Chiba University

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