Separation of the alkaloids deoxypeganine,peganol, and deoxyvasicinone by the HPLC method

Institute of Chemistry of Plant Substances Academy of Sciences of the Uzbek SSR, Tashkent. Scientific Center for Chromatography, Academy of Sciences of the Uzbek SSR. Institute of the Chemistry and Physics of Polymers, Academy of Sciences of the Uzbek SSR, Tashkent. Iranslated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 297–298, March–April, 1991.     

Synthesis and membrane activity of new derivatives of 2,3-benzo-18-crown-6

The acylation of 2,3-benzo-18-crown-6 with carboxylic acids in the presence of polyphosphoric acid has given new acyl derivatives which have been reduced to the corresponding alkyl derivatives. The ionophoric activities of the compounds have been investigated on mitochondrial membranes.Institute of Biochemistry, Academy of Sciences of the Uzbek SSR, Tashkent. Institute of Bioorganic Chemistry, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 634–637, September–October, 1983.     

Circular dichroism of veralosidine and its derivatives

Summary On the basis of their CD spectra, the alkaloids veralosidine, veralosine, veralosinine, and veralosidinine have been assigned to the 25S series.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 623–625, September–October, 1976.     

Effect of the irradiation of cotton seeds with pulses of concentrated light on the composition of the cottonseed oil

The presowing irradiation of cotton seeds with pulses of concentrated light (PCL) causes a change in a number of indices of the oil. When the seeds are stored, oxidative processes in them are intensified. In the oil of the harvested seeds some indices are restored.Institute of the Chemistry of Plant Substances of the Academy of Sciences of the Uzbek SSR, Tashkent, and S. V. Starodubtsev Institute of Technical Physics of the Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 777–780, November–December, 1980.     

Difference-perturbation spectra of iodotyrosines and iodothyronines in polyethyleneglycols

The difference-perturbation absorption spectra of monoiodotyrosine, diiodotyrosine, triiodothyronine, and thyroxine with low- and high-molecular-mass polyethyleneglycols as perturbants have been measured and characterized. The SDP spectra, and their intensity and the position of the main maximum depend on the number of iodine atoms and the state of ionization of the hydroxyl in accordance with their electron-accepting properties. Institute of Physiology, Uzbek SSR Academy of Sciences, Tashkent. Institute of Biochemistry, Uzbek SSR Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, Vol. 6, pp. 840–845, November–December, 1989.     

Isolation and antibiotic properties of cis-hexadeca-4,7,10,13-tetraenoic acid from the algaScenedesmus obliquus UA-2-6

Summary By the method of checking antibiotic activity, conditions have been selected for the isolation of cis-hexadeca-4,7,10,13-tetraenoic acid from the fatty-acid fractions of the lipids ofScenedesmus obliquus UA-2-6. Its structure has been confirmed and it has been established that this acid possesses a broad spectrum of antibiotic action.Institute of Microbiology, Academy of Sciences of the Uzbek SSR, Tashkent. Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 379–385, May–June, 1978.     

Carbohydrates of Aerva lanata

F. N. Rusanov Botanical Garden, Uzbek SSR Academy of Sciences, Tashkent. Institute of Chemistry of Plant Substances, Uzbek SSR Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 425–426, May–June, 1989.     

Iodine-containing complexes of the Black Sea algaPhyllophora nervosa

Iodine-containing complexes have been isolated from a Black Sea red alga. Information is given showing their carbohydrate nature. The causes of the hydrophobic peptide-peptide interaction in the complex are discussed.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Physicochemical Institute, Academy of Sciences of the Ukrainian SSR, Odessa. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 772–776, November–December, 1983.     

Mass spectrum of glycosides of ecdysteroids and their peracetates

Features of the fragmentation of the carbohydrate chains of galactopyranosides of ecdysteroids (sileneosides A–D) and their peracetates under electron impact are discussed. The migration of Gal and AcGal residues from C-22 to C-20 has been detected. The secondary-ion mass spectra of the sileneosides using liquid matrices are considered.Institute of Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. All-Union Scientific-Research Institute of Agricultural Biotechnology, V. I. Lenin All-Union Academy of Agricultural Sciences, Moscow. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 226–231, March–April, 1991.     

Stereospecific analysis of the triacylglycerols of a cottonseed oil hydrogenate and its fractions

A cottonseed oil hydrogenate has been fractionated into three fractions: high-melting, medium-melting, and liquid. It has been established that the fat of the second fraction, because of its physicochemical indices, consistency, and the distribution of the saturated fatty acyl radicals in the extreme positions of the TAG molecules, can be regarded as a cocoa butter substitute.Institute of the Chemistry of Plant Substances of the Uzbek SSR Academy of Sciences, Tashkent. Institute of Bioorganic Chemistry of the Uzbek SSR Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 509–513, July–August, 1987.     

Immunomodulating activity of gossypol derivatives

Information is given on the immunosuppressive activity of a number of gossypol derivatives, and it is shown that practically all the compounds studied are immunotropic. The structural-functional relationship and the dose-dependent nature of the action of the substances obtained are shown.A. S. Sadykov Institute of Bioorganic Chemistry, Uzbek SSR Academy of Sciences, Tashkent. Tashkent State Medical Institute, Uzbek SSR Ministry of Health. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 647–650, September–October, 1988.     

Comparative study of the cytotoxins of the venom of the central asian cobraNaja naja oxiana by the intrinsic-fluorescence method

The intrinsic fluorescence of cytotoxin V_C1 and V_C5 from the venom of the Central Asian cobra due to the tyrosine residues and differing with respect to quantum yield for these two polypeptides because of the nonidentity of the microenvironments of the tyrosyl residues has been measured and characterized. The dependence of the quantum yield on the pH and the temperature also indicate this nonidentity.Institute of Bioorganic Chemistry, Academy of Sciences of the Uzbek SSR, Tashkent. Institute of Biochemistry, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 226–228, March–April, 1986.     

Glucofructans of Cousinia polycephala

Institute of Organic Chemistry, Kirghiz SSR Academy of Sciences, Frunze. Institute of Plant Substances, Uzbek SSR Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 427–429, May–June, 1989.     

Solanidine and diacetylsevedine from Korolkowia sewerzowii

Institute of Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 440–441, May–June, 1991.     

Polysaccharides of subspecies of Cousinia

Institute of the Chemistry of Plant Substances, Uzbek SSR Academy of Sciences, Tashkent. Institute of Organic Chemistry, Kirghiz SSR Academy of Sciences, Frunze. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 750–751, September–October, 1988.     

The NMR study of alkaloids. VI. A comparison of the stereochemistries of pseudocopsinine and 14,15-dihydrovindolinine by13C NMR spectroscopy

On the basis of a comparative study of the¹³C NMR spectra of the natural alkaloid pseudocopsinine and its synthetic analog 14,15-dihydrovindolinine it has been shown that their stereochemistries are not identical.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 334–337, May–June, 1984.     

Demethylenedelpheline — A new diterpene alkaloid from Delphinium corumbosum

Abu Ali Ibn Sina [Avicenna] Tadzhik State Medical Institute, Dushanbe. Institute of the Chemistry of Plant Substances, Uzbek SSR Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 50–51, January–February, 1989.     

4',4”- and 4',5”-di-sec-butyl-2,3:11,12-dibenzo-18-crown-6 — An ionophore for magnesium in natural and model systems

The ionophoric properties of the di-sec-butyl derivatives of dibenzo-18-crown-6 have been studied in natural and model membranes. It has been shown that the di-sec-butyl substituents in the benzene rings of dibenzo-18-crown-6 impart to the cyclopolyether the properties of an ionophore for magnesium. The Mg²⁺/Ca²⁺ selectivity of the cyclopolyether investigated was 4.8 according to results obtained on artifical membranes and mitochondria.Institute of Biochemistry, Academy of Sciences of the Uzbek SSR, Tashkent. Institute of Bioorganic Chemistry, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 234–239, March–April, 1981.     

Structure of lehmannine N-oxide

The molecular and crystal structure of lehmannine in its monohydrate has been studied by x-ray structural analysis. Rings A, B, and C have the chair form and ring D the half-chair form in which the deviations of the atoms from their mean-square plane does not exceed 0.06 Å.Institute of Bioorganic Chemistry, Academy of Sciences of the Uzbek SSR, Tashkent. Institute of Crystallography, Academy of Sciences of the USSR, Moscow. V. I. Lenin Tashkent State University. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 757–763, November–December, 1981.