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Electrochemical reactivity of biologically active quinone/hydroquinone sesquiterpenoids on glassy carbon electrodes
(Bioelectrochemistry and Bioenergetics, 1987)
The redox reactivity of avarone and avarol, a quinone/hydroquinone couple isolated from the marine sponge Dysidea avara, was investigated by cyclic voltammetry, using a glassy carbon electrode. Both oxidation of avarol and ...
Avarol-induced DNA strand breakage in vitro and in Friend erythroleukemia cells
(Cancer Research, 1987)
The hydroquinone-containing cytostatic compound avarol inhibits predominantly growth of those cell lines which have a low level of superoxide dismutase. The substrate of this enzyme, the superoxide anion, was found to be ...
Suppression of the modulatory effects of the antileukemic and anti-human immunodeficiency virus compound avarol on gene expression by tryptophan
(Cancer Research, 1989)
The amino acid L-tryptophan is known to be a modulator of many processes of cell metabolism. In this contribution we show that L-tryptophan interferes with some biological effects of the antileukemic and anti-human ...
The lead tetraacetate oxidation of Δ6-unsaturated tertiary alcohols. Eight-membered cyclic ether formation
(Research on Chemical Intermediates, 1989)
In the lead tetraacetate oxidation of the unsaturated tertiary cyclic alcohols 1a and 1b, and the acyclic alcohol 15a, all possessing a Δ6-olefinic bond (with respect to the hydroxyl group), the α-acetoxylated eight-membered ...
Free radical carbocyclic ring reconstruction
(Tetrahedron Letters, 1986)
Alkenyl radical generated by β-fragmentation of tertiary cyclohexyloxy radical with carbocyclic ring opening, possessing a suitably located olefinic double bond, undergoes to the intramolecular 5-exo-trigonal cyclization ...
Free radical annulation of cyclopentane ring
(Tetrahedron Letters, 1986)
Homoallyl radical, e.g. 2, reacts with an electron-deficient olefinic bond 1 with a new CC bond forming and arising of a 5-hexenyl radical 3 which further undergoes to 5-exo-trigonal cyclization with a cyclopentane ring ...
Local electron density models for Tl to Pb conversion in lorandite
(Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detecto, 1988)
The nuclear conversion of 205Tl to 205Pb by neutrino capture, lorandite (TlAsS2) converts into Pb-bearing lorandite (Tl1-xPbxAsS2) where x is a very small number. Having used a highly simplified cluster model of lorandite, ...
Investigation of the effect of the aminocarboxylato chelate conformation on the optical activity of the cis(NO2),trans(NH2) -bis(aminocarboxylato)dinitrocobalt/ate(III) isomers
(Polyhedron, 1988)
In the cis(NO2),trans(NH2)-bis(aminocarboxylato) dinitrocobalt/ate(III) isomers, containing glycinato, S-alaninato, S-n-valinato, S-valinato, S-n-leucinato, S-leucinato, S-i-leucinato and S-arginine ligands, respectively, ...
Thin-layer chromatography on polyacrylonitrile. I. Effect of the cis-trans configuration of cobalt(III) complexes on their RF values
(Journal of Chromatography A, 1989)
Determination of Fluorine Ions Penetration Degree Into Enamel by Empa.
(Journal de Physique (Paris), Colloque, 1984)
Exogen of different preparations was applied to completely healthy teeth of children up to 11 years. A month after application of fluorine, teeth were extracted and prepared by standard methods for investigation by electron ...