A Umeyama
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Explore the profile of A Umeyama including associated specialties, affiliations and a list of published articles.
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22
Citations
72
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Recent Articles
1.
Shoji N, Umeyama A, Iuchi A, Saito N, Takemoto T, Nomoto K, et al.
J Nat Prod
. 2011 Mar;
51(4):791-2.
PMID: 21401154
No abstract available.
2.
Umeyama A, Ito S, Yoshigaki A, Arihara S
J Nat Prod
. 2000 Nov;
63(11):1540-2.
PMID: 11087603
Two novel steroids with a cyclopropane ring at C-25 and C-26, 7-oxopetrosterol (1) and 7alpha-hydroxypetrosterol (2), along with two known compounds, petrosterol (3) and 23,24-dihydrocalysterol (4), have been isolated from...
3.
Umeyama A, Adachi K, Ito S, Arihara S
J Nat Prod
. 2000 Sep;
63(8):1175-7.
PMID: 10978223
Two novel steroids, polasterol A (1) and polasterol B sulfate (2), along with two known compounds, 22(E),24-isopropylcholesta-5, 22-dien-3 beta-ol (3) and halistanol sulfate (4), have been isolated from the Japanese...
4.
Umeyama A, Nozaki M, Arihara S
J Nat Prod
. 1998 Jul;
61(7):945-7.
PMID: 9677281
Three new diterpenes, polasols A-C (1-3), have been isolated from the Japanese marine sponge Epipolasis sp. The structures of 1-3 were assigned primarily by 2D NMR methods.
5.
Takei M, Umeyama A, Shoji N, Arihara S, Endo K
J Pharm Sci
. 1995 Feb;
84(2):228-30.
PMID: 7537812
Penasterol and penasterone, constituents of the Okinawan marine sponge Penares incrustans, dose-dependently inhibited anti-IgE-induced histamine release from rat mast cells. The concentrations of penasterol and penasterone required for 50% inhibition...
6.
Shoji N, Umeyama A, Yoshikawa K, Nagai M, Arihara S
Phytochemistry
. 1994 Nov;
37(5):1437-41.
PMID: 7765763
From the seeds of Impatiens balsamina have been isolated four rare baccharane glycosides, hosenkosides L-O. The structures of all isolates were secured by the use of 2D NMR techniques (1H-1H...
7.
Shoji N, Umeyama A, Yoshikawa K, Arihara S
Phytochemistry
. 1994 Nov;
37(5):1397-402.
PMID: 7765757
From the herb of Anagallis arvensis, we have isolated four novel oleanane glycosides, anagallosaponins VI-IX, and two artifact saponins, apoanagallosaponins III and IV, formed from anagallosaponins III and IV. The...
8.
Shoji N, Umeyama A, Yoshikawa K, Arihara S
Chem Pharm Bull (Tokyo)
. 1994 Sep;
42(9):1750-5.
PMID: 7954927
From the herb of Anagallis arvensis L., we have isolated five novel oleanane glycosides, anagallosaponins I-V and the artifact, methyl anagallosaponin I, besides anagallosides A, B, C, and desglucoanagallosides A...
9.
Hosenkosides F, G, H, I, J, and K, novel baccharane glycosides from the seeds of Impatiens balsamina
Shoji N, Umeyama A, Saitou N, Yoshikawa K, Nagai M, Arihara S
Chem Pharm Bull (Tokyo)
. 1994 Jul;
42(7):1422-6.
PMID: 7923465
From the seeds of Impatiens balsamina we have isolated six novel baccharane glycosides, hosenkosides F-K. The structures of all isolates were determined by the use of two dimensional (2D) NMR...
10.
Shoji N, Umeyama A, Takei M, Arihara S
J Pharm Sci
. 1994 May;
83(5):761-2.
PMID: 7520938
A new polyhydroxylated steroid (24-methylene-1 alpha, 3 beta, 11 alpha-trihydroxycholest-5-ene-18-oic acid-3-acetate, 1) and known related compounds (2-4) from the soft coral Sinularia abrupta have potently inhibited histamine release from rat...