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Dive into the research topics where Katsumi Okubo is active.

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Featured researches published by Katsumi Okubo.


Nippon Kagaku Kaishi | 1958

Biosyntheses of Lignin

Hisao Ishikawa; Katsumi Okubo

幼植物の組織溶液に基質を与えてリグニン生成量を測定する方法で, リグニン形成にはシキミ酸, フェニルピルピン酸(PPA),p-オキシPPA,フェニルアラニン,フェルラ酸およびコニフェリルアルコールが加わり,アセテートおよびピルビン酸はほとんど関与しないことを明らかにし, 糖からリグニン構成単位の形成過程を推察した。またチロシンおよびDOPAがリグニン形成に必要な基質でないことを知り,ペルオキシダーゼで脱水素重合する基質の重合物とリグニンとの活性基量,アルカリ酸生成物量および吸収スペクトルを比較検討した結果から,DHPはリグニンと近似した性質を示すが, なお幾多の重要な差異のあることを指摘し, リグニンには酸性でΔe効果を示す活性基が存在することを明らかにした。


Japan Tappi Journal | 1982

On the Effect of Mucins on Papermaking by Japanese Traditional Hand Process

Hisao Ishikawa; Katsumi Okubo; Tae Oki


Nippon Kagaku Kaishi | 1974

Study on the Characteristic Physlcal Properties of a Tororo-aoi Mucin Solution

Hisao Ishikawa; Katsumi Okubo; Tae Oki


Japan Tappi Journal | 1988

Screening of White-rot Fungi and Characteristics of Bio-degraded TMP

Fumitaka Nishibe; Katsumi Okubo; Hisao Ishikawa


Japan Tappi Journal | 1988

On the Modification of TMP by Acetylation and the Mechanical Strength of the Acetylated Pulp Sheet

Tae Soo Cho; Katsumi Okubo; Hisao Ishikawa


Japan Tappi Journal | 1986

Changes of the water retention value, the composition and the morphological structure of TMP during bleaching.

Takashi Kataoka; Katsumi Okubo; Hisao Ishikawa


Japan Tappi Journal | 1982

Bleaching of Pulps with Sodium Hypochlorite· Hydrogen Peroxide

Hisao Ishikawa; Norinaga Iida; Katsumi Okubo; Tae Oki


Japan Tappi Journal | 1981

Bleaching of High-yield Pulp with NaOCl·peroxide

Hisao Ishikawa; Norinaga Iida; Katsumi Okubo; Tae Oki


Journal of the Japanese Technical Association of the Pulp and Paper Industry | 1978

H?S2?TO?S2?Tによるリグニンの淡色化:パルプ漂白に関する研究第8報

Tae Oki; Hisao Ishikawa; Katsumi Okubo


Japan Tappi Journal | 1978

On the Charactaristic Mechanical Properties of Hollocellulose Pulp Bleached with Peracetic Acid in Vapor Phase.

Katsumi Okubo; Tae Oki; Hisao Ishikawa

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