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Toplam kayıt 67, listelenen: 41-50
3,7-Dimethylguanine, A New Purine From A Philippine Sponge Zyzzya Fuliginosa
(Pharmaceutical Soc Japan, 2001)
A new purine 3,7-dimethylguanine (1) has been isolated from the marine sponge Zyzzya fuliginosa, along with the known metabolites. makaluvamines A, C, K (2-4), 4-hydroxyphenylacetic acid (5), methyl ester of 4-hydroxyphenylacetic ...
Preconcentration and Determination of Lead, Cadmium and Nickel From Water Samples Using a Polyethylene Glycol Dye Immobilized on Poly(Hydroxyethylmethacrylate) Microspheres
(Japan Soc Analytical Chemistry, 2006)
A simple and sensitive preconcentration analysis-atomic absorption spectrometric procedure is described for the determination of lead, cadmium and nickel. The method is based upon on-line preconcentration of metal ions on ...
A Novel Two-Enzyme Amperometric Electrode For Lactose Determination
(Japan Soc Analytical Chemistry, 2002)
Coimmobilization of beta-galactosidase and glucose oxidase in a redox polymer, polyvinylferrocenium perchlorate (PVF+ClO4-), led to the development of an enzyme electrode for the determination of lactose. The amperometric ...
Trojanosides I-K: New Cycloartane-Type Glycosides From The Aerial Parts Of Astragalus Trojanus
(Pharmaceutical Soc Japan, 2001)
Three new cycloartane-type triterpene glycosides have been isolated from the aerial parts of Astragalus trojanus. The structures were established mainly by a combination of one- and two-dimensional NMR techniques ...
Two New Triterpene Saponins From Eryngium Campestre
(Pharmaceutical Soc Japan, 2005)
Two new triterpene saponins, 3-O-beta-D-glucopyranosyl-(1 -> 2)-[alpha-L-rhamnopyranosyl-(1 -> 4)]-beta-D-glucuronopyranosyl-22-O-angeloyl-R1-barrigenol (1) and 3-O-beta-D-glucopyranosyl-(1 -> 2)-[alpha-L-rhamnopyranosyl(1 ...
Two New Iridoid Glucosides From Verbascum Salviifolium Boiss.
(Verlag Z Naturforsch, 2005)
From the aerial parts of the plant Verbascum salviifolium, two new iridoid glucosides, 6-O-beta-D-glucopyranosylcatalpol (1) and 6-O-(6"-O-trans-p-hydroxycinnamoyl)-beta-D-glucopyranosylaucubin (2) along with five known ...
Spectroscopic, Magnetic And Crystal Structure Analysis Of Diammine-Bis(2,6-Dibromo-4-Chlorophenolato-O)Copper(Ii)
(Walter De Gruyter Gmbh, 2005)
The [Cu(C6H2Br2ClO)(2)(NH3)(2)] complex was synthesized and characterized by XRD, UV/vis, FTIR, DSC, elemental analysis and magnetic susceptibility measurements. The structural analysis of the title complex indicated that ...
Chemical Synthesis Of Thiophene-Pyrrole Copolymer
(Slovensko Kemijsko Drustvo, 2003)
Oligomerization reactions of thiophene and pyrrole monomers and chemical copolymerization of these oligomers were investigated in acetonitrile solutions containing thiophene-HBF4, pyrrole-HBF4 and thiophene-pyrrole-HBF4. ...
Quantum Chemical Studies on The Structures of Some Heterocyclic Azo Disperse Dyes
(Arkat Usa Inc, 2008)
The ground-state geometries, absorption wavelengths, oscillation strengths for a series of some novel hetarylazoindole derivatives were studied with density functional theory (DFT) and time-dependent density functional ...
Spectroscopic And Electrochemical Observation Of Hydrogen-Bonded Imidazole And 2-Aminoimidazole Clusters
(Slovensko Kemijsko Drustvo, 2007)
The electroreductions of imidazole and 2-aminoimidazole were investigated on a Pt electrode in acetonitrile containing tetrabutylammonium tetrafluoroborate with and without the presence of HBF4. The effects of lithium and ...