E. Okuyama

Publications83
h-index28
Citations2,221
Highly Influential Citations61
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Separation of Leucas aspera, a medicinal plant of Bangladesh, guided by prostaglandin inhibitory and antioxidant activities.
According to the traditional usage of the plant for antiinflammation and analgesia, Leucas aspera was tested for its prostaglandin (PG) inhibitory and antioxidant activities. The extract showed both… Expand
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Analgesic components of saposhnikovia root (Saposhnikovia divaricata).
By activity-oriented separation using the writhing method in mice, the analgesic components of Saposhnikovia root (Saposhnikovia divaricata Schischkin; Umbelliferae) were identified to be chromones,… Expand
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Immunomodulatory constituents from an Ascomycete, Chaetomium seminudum.
A screening study focusing on immunomodulatory activity of the EtOAc extract of an Ascomycete, Chaetomium seminudum, has afforded a known epipolythiodioxopiperazine, chetomin (1), together with three… Expand
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Immunomodulatory constituents from an ascomycete, Microascus tardifaciens.
Fractionation guided by the immunosuppressive activity of the defatted AcOEt extract of an Ascomycete, Microascus tardifaciens, afforded eight constituents, questin (emodin 8-O-methylether) (1),… Expand
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Usnic acid and diffractaic acid as analgesic and antipyretic components of Usnea diffracta.
Diffractaic acid and usnic acid were identified as the analgesic and antipyretic components of a lichen, Usnea diffracta. Both compounds showed an analgesic effect by the acetic acid-induced writhing… Expand
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Pharmacologically active components of viticis fructus (Vitex rotundifolia). II. The components having analgesic effects.
The extract of Viticis Fructus appeared to have an analgesic effect, and was subjected to activity-guided separation using acetic acid-induced writhing in mice. The active fraction gave new… Expand
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Anthraquinone production by transformed root cultures of Rubia tinctorum: Influence of phytohormones and sucrose concentration
Hairy roots ofRubia tinctorum were induced by infection with Agrobacterium rhizogenes and cultured in Murashige and Skoog liquid medium containing 3% sucrose. The effects of the phytohormones IAA,… Expand
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Six Immunosuppressive Features from an Ascomycete, Zopfiella longicaudata, Found in a Screening Study Monitored by Immunomodulatory Activity.
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Six immunosuppressive features from an ascomycete, Zopfiella longicaudata, found in a screening study monitored by immunomodulatory activity.
In a screening study on immunomodulatory fungal metabolites, three known anthraquinones, carviolin (roseo-purpurin) (1), 1-O-methylemodin (2), omega-hydroxyemodin (citreorosein) (4), and a new… Expand
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Analgesic principles from Aralia cordata Thunb.
The analgesic principles from Aralia cordata Thunb, were identified with (ent)-kaur-16-en-19-oic acid (KA) and (ent)-pimara-8(14),15-dien-19-oic acid (PA), respectively. Both compounds were… Expand
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