Zobrazeno 1 - 10 of 17 pro vyhledávání: '"S. L. Portnova"'
1
Study of the conformational states of cyclopeptide systems X. Spatial structure of cyclohexapeptides constructed of L-valine, L-leucine, L-norvaline, and glycine residues
Autor: E. A. Meshcheryakova, Yu.A. Ovchinnikov, I. A. Lavrinovich, G. A. Kogan, M. D. Isabaev, Vadim T. Ivanov, P. V. Kostetskii, S. L. Portnova
Publikováno v: Chemistry of Natural Compounds. 11:209-216
1. The CD, IR, and NMR spectra of the cyclohexapeptides (1)–(7) have been studied. 2. It has been shown that in trifluoroethanol and ethanol the compounds investigated show a tendency to association which is particularly strong in the case of[(L-Va
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1dcaadc7abc4239a0d08dbdf0fca412c
https://doi.org/10.1007/bf00570670
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2
Study of conformation states of cyclopeptide systems
Autor: Vadim T. Ivanov, V. V. Lapshin, I. A. Lavrinovich, P. V. Kostetskii, S. L. Portnova, Yu.A. Ovchinnikov
Publikováno v: Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 23:2233-2239
1. The successive introduction of N-methyl groups is accompanied by a decrease in the stability of the folded sheet structure in the series of cyclic hexapeptides: cyclo(-L-Val-Sar-L-Val-Gly-L-Val-Gly-) (I) — cyclo(-L-Val-Sar-L-Val-Sar-L-Val-Gly-)
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c1785968a341307edf14938cb1476e6b
https://doi.org/10.1007/bf00921293
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3
Microbiological transformations of steroids
Autor: Leonid M. Kogan, N. N. Suvorov, I. V. Ulezlo, I. K. Kozlova, I. V. Torgov, G. K. Skryabin, S. L. Portnova
Publikováno v: Bulletin of the Academy of Sciences, USSR Division of Chemical Science. 13:1908-1913
A culture ofActinomyces albus 3006 can effect the selective and stereospecific reduction of the C-20 keto group of corticosteroids and their Δ1-dehydro analogs with formation of the corresponding 20β-hydroxy compounds.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::36fab753f70c8d4d8c5a7c417577a3cd
https://doi.org/10.1007/bf00844486
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5
Some aspects of NMR techniques for the conformational analysis of peptides
Autor: Vladimir F. Bystrov, V. A. Afanas'ev, S. L. Portnova, S. A. Koz'min, T. A. Balashova, Yu. D. Gavrilov
Publikováno v: Pure and Applied Chemistry. 36:19-34
An outline is given of some new NMR spectroscopic approaches to the spatial structure of peptides in solution which have been recently suggested and tested in the Shemyakin Institute for Chemistry of Natural Products. The previously derived angular d
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2d43f01b21de7140a127830c9b969089
https://doi.org/10.1351/pac197336010019
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7
Refinement of the angular dependence of the peptide vicinal NHCαH coupling constant
Autor: S. L. Portnova, Vladimir F. Bystrov, T. A. Balashova, Vadim T. Ivanov, Yu.A. Ovchinnikov
Publikováno v: Tetrahedron. 29:873-877
The refined dependence of the peptide NHCαH vicinal coupling constant on the dihedral angle θ have been derived on the basis of the accumulated experimental data. The mean permissible values (in Hz) are approximated by 3 J NHCH = 9·4 cos 2 θ -
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7279988ce5e461a8817a146a10dcd874
https://doi.org/10.1016/0040-4020(73)80031-6
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