Cucumarioside G4 — A new triterpenglycoside from the holothurian Eupentacta fraudatrix

A minor glycoside — cucumarioside G₄ (I) — has been isolated from the total triterpeneglycosides of the holothurianEupentacta fraudatrix, and its structure has been determined by physical and chemical methods as 16β-acetoxyholosta-7,23E-diene-3β, 25-diol 3-O-(3-O-methyl-β-D-xylopyranosyl)-(1→3)-O-β-D-glucopyranosyl-(1→4)-O-β-D-quinovopyransoyl-(1→2)-(4-O-(sodium sulfato)-β-D-xylopyranoside)].     

Trisulfated glycosides from the holothurianCucumaria japonica

Three new triterpene glycosides have been isolated from an alcoholic extract of the Pacific Ocean commercial holothurian Cucumaria japonica: cucumariosides A _T 1 (I), A _T 2 (II), and A _T 3 (III). The structures of these glycosides have been established by chemical and physical methods.     

New glycosides from the holothurian Cucumaria japonica

Four new compounds have been isolated from the fraction of weakly polar triterpene glycosides of the holothurianCucumaria japonica: cucumariosides A₁-2 (I), A₀-1 (II), A₀-2 (III), and A₀-3 (IV). The structures of these substances have been established by chemical and physical methods.Deceased.Pacific Ocean Institute of Bioorganic Chemistry, Far-Eastern Scientific Center, Russian Academy of Sciences, Vladivostok. Institute of Chemistry of Plant Substances, Uzbekistan Republic Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 242–248, March–April, 1993.     

Trisulfated glycosides from the holothurianCucumaria japonica

Three new triterpene glycosides have been isolated from an alcoholic extract of the Pacific Ocean commercial holothurian Cucumaria japonica: cucumariosides A _T 1 (I), A _T 2 (II), and A _T 3 (III). The structures of these glycosides have been established by chemical and physical methods.Deceased.Pacific Ocean Institute of Bioorganic Chemistry, Far Eastern Branch, Russian Academy of Sciences, Vladivostok. Institute of Chemistry of Plant Substances, Academy of Sciences of the Uzbekistan Republic, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 369–374, May–June, 1993.     

A comparative investigation of the fatty acid compositions of the seeds of a number of lines of a genetic collection of Gossypium hirsutum

A comparative analysis has been made of the amounts of lipids and their fatty-acid compositions in the seeds of the lines of agenetic collection of cotton plants of the speciesGossypium hirsutum and their hybrids and the variety Tashkent-1. The results obtained on the fatty-acid compositions of some hybrids make it possible to recommend the use of individual lines of cotton plants as donors for improving the food-value indices of cottonseed oil.Institute of Chemsitry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. V. I. Lenin Tashkent State University. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 173–176, March–April, 1991.     

Ordered structures based on self-organized Au and CdSe nanoparticles

Methods for obtaining cadmium selenide and gold nanoparticles have been developed. The sizes of the nanoparticles are determined and the morphology, structure, and chemical composition of these nanoparticles and their ensembles are studied by a complex of structural methods: electron diffraction, X-ray diffraction, energy-dispersive X-ray analysis, high-resolution transmission electron microscopy, and small-angle X-ray scattering. Gold nanoparticles are mainly spherical and have an average size of 10 nm. They are single-phase and have an fcc crystal structure. Samples of synthesized CdSe nanoparticles contain monodisperse spherical particles 12 nm in size with a wurtzite structure. The deposition of nanoparticles on a carbon substrate is accompanied by their self-organization into a closely packed two-dimensional structure with a pronounced texture in which all nanoparticles are oriented in the [001] direction perpendicularly to the carbon substrate plane.     

Innovative experimental methods open new properties of blood coagulation

This article describes a novel experimental system for optical recording of the polymerization of blood coagulation proteins. It was shown that the experimental method has diagnostic abilities and defines some coagulation pathologies. Using this method, new properties of the coagulation system were discovered. The experimental system described is a prototype for a clinical diagnostic system.