Valery M Dembitsky - Profile on Academia.edu (original) (raw)
Papers by Valery M Dembitsky
Comparative biochemistry and physiology. B. Comparative biochemistry, Feb 1, 1994
Lipid and phospholipid compositions of an endemic deep-water freshwater gammarid, belonging to th... more Lipid and phospholipid compositions of an endemic deep-water freshwater gammarid, belonging to the subphylum Crustacea, Acanthogammarus grewingkii was studied. Content of aikenylacyl, alkylacyl and diacyi forms in the main phospholipid classes (phosphatidylethanolamine and phosphatydilcholine) were established using reaction micro-thin-layer chromatography. The fatty acids compositions of total lipids, neutral, glycoand phospholipid fractions were investigated by capillary gas chromatography-mass spectrometry. Seventy-nine fatty acids were identified: 26 saturated (iso-, anteiso-and cyclo-)
Comparative biochemistry and physiology. B. Comparative biochemistry, Aug 1, 1994
Lipid and phospholipid compositions of an endemic deep-water freshwater gammarid, belonging to th... more Lipid and phospholipid compositions of an endemic deep-water freshwater gammarid, belonging to the subphylum Crustacea, Acanthogammarus grewingkii was studied. Content of aikenylacyl, alkylacyl and diacyi forms in the main phospholipid classes (phosphatidylethanolamine and phosphatydilcholine) were established using reaction micro-thin-layer chromatography. The fatty acids compositions of total lipids, neutral, glycoand phospholipid fractions were investigated by capillary gas chromatography-mass spectrometry. Seventy-nine fatty acids were identified: 26 saturated (iso-, anteiso-and cyclo-)
Comparative biochemistry and physiology. B. Comparative biochemistry, Feb 1, 1994
Lipid and phospholipid compositions of an endemic deep-water freshwater gammarid, belonging to th... more Lipid and phospholipid compositions of an endemic deep-water freshwater gammarid, belonging to the subphylum Crustacea, Acanthogammarus grewingkii was studied. Content of aikenylacyl, alkylacyl and diacyi forms in the main phospholipid classes (phosphatidylethanolamine and phosphatydilcholine) were established using reaction micro-thin-layer chromatography. The fatty acids compositions of total lipids, neutral, glycoand phospholipid fractions were investigated by capillary gas chromatography-mass spectrometry. Seventy-nine fatty acids were identified: 26 saturated (iso-, anteiso-and cyclo-)
Comparative study of the endemic freshwater fauna of Lake Baikal-VII. Carotenoid composition of the deep-water amphipod crustaceanAcanthogammarus (Brachyuropus)grewingkii
Comparative Biochemistry and Physiology B, Aug 1, 1996
Abstract The carotenoid composition of the deep-water gammaride is reported. Astaxanthin and thei... more Abstract The carotenoid composition of the deep-water gammaride is reported. Astaxanthin and their derivatives were determined to be major components of the carotenoids (58.4%). Astaxanthin-glycoside-esters comprised 21.6% of total carotenoids. A new carotenoid glycoside ester (CGE) was isolated from the deep-water gammarideAcanthogammarus (Brachyuropus)grewingkii and its structure was elucidated. The structures were determined from spectra (1H-NMR,13C-NMR, MS, IR) after their isolation and quantification by means of semipreparative RP-HPLC and capillary GC-MS.
Knowledge Updates 2020/2
Science of Synthesis
Fatty acid amides from freshwater green alga Rhizoclonium hieroglyphicum
Phytochemistry, 2000
Freshwater green algae Rhizoclonium hieroglyphicum growing in the Ural Mountains were examined fo... more Freshwater green algae Rhizoclonium hieroglyphicum growing in the Ural Mountains were examined for their fatty acid amides using capillary gas chromatography-mass spectrometry (GC-MS). Eight fatty acid amides were identified by GC-MS. (Z)-9-octadecenamide was found to be the major component (2.26%).
The occurrence of dioic, hydroxy, branched, and unsaturated fatty acids in cyanobacteria of the g... more The occurrence of dioic, hydroxy, branched, and unsaturated fatty acids in cyanobacteria of the genus Aphanizomenon growing in different freshwater lakes has been studied. Unusual dicarboxylic (from 4.52 to 7.14%) and other fatty acids were identified by gas chromatography/mass spectrometry (GC/MS).
Molecules
This review delves into the investigation of the biological activity and structural diversity of ... more This review delves into the investigation of the biological activity and structural diversity of steroids and related isoprenoid lipids. The study encompasses various natural compounds, such as steroids with aromatic ring(s), steroid phosphate esters derived from marine invertebrates, and steroids incorporating halogen atoms (I, Br, or Cl). These compounds are either produced by fungi or fungal endophytes or found in extracts of plants, algae, or marine invertebrates. To assess the biological activity of these natural compounds, an extensive examination of referenced literature sources was conducted. The evaluation encompassed in vivo and in vitro studies, as well as the utilization of the QSAR method. Numerous compounds exhibited notable properties such as strong anti-inflammatory, anti-neoplastic, anti-proliferative, anti-hypercholesterolemic, anti-Parkinsonian, diuretic, anti-eczematic, anti-psoriatic, and various other activities. Throughout the review, 3D graphs illustrating th...
Selective Synthesis of Unsymmetrical Peroxides: Transition-Metal-Catalyzed Oxidation of Malononitrile and Cyanoacetic Ester Derivatives by tert-Butyl Hydroperoxide at the α-Position
Synthesis, May 5, 2011
ABSTRACT A novel method was developed for the selective oxidation of α-monosubstituted malononitr... more ABSTRACT A novel method was developed for the selective oxidation of α-monosubstituted malononitrile and cyanoacetic ester derivatives at the α-position based on transition-metal-catalyzed reaction (Cu, Fe, Mn, Co) with tert-butyl hydroperoxide giving unsymmetrical peroxides in 63-94% yields. The method is facile, does not require large excesses of reagents, and is amenable to gram-scale synthesis.
α-Alkyl Ketones by the Reaction of Trialkylboranes with α-Bromo Ketones
Boron Compounds, 2005
Synthesis of 5-(Dihydroxyboryl)uracil by Halogen–Metal Exchange
Addition of Thiols to Alkenylboranes
Boron Compounds, 2005
Addition of Halogens to Alkenylboranes and Alkenylboronates
Boron Compounds, 2005
Diels–Alder Reaction of Alkenylboranes and Alkenylboronates
Boron Compounds, 2005
Addition of Hydrogen Halides to Vinylboronates
Boron Compounds, 2005
α-Halo-γ,γ,γ-trichloropropylborane Derivatives by Additions to Vinylboranes and Vinylboronates
Boron Compounds, 2005
Metal-Exchange Reactions of Diazo Compounds
Boron Compounds, 2005
Synthesis of 1-Boraadamantane Derivatives via Hydroboration
Boron Compounds, 2005
Thioboration of Ethoxyacetylene
Boron Compounds, 2005
Comparative biochemistry and physiology. B. Comparative biochemistry, Feb 1, 1994
Lipid and phospholipid compositions of an endemic deep-water freshwater gammarid, belonging to th... more Lipid and phospholipid compositions of an endemic deep-water freshwater gammarid, belonging to the subphylum Crustacea, Acanthogammarus grewingkii was studied. Content of aikenylacyl, alkylacyl and diacyi forms in the main phospholipid classes (phosphatidylethanolamine and phosphatydilcholine) were established using reaction micro-thin-layer chromatography. The fatty acids compositions of total lipids, neutral, glycoand phospholipid fractions were investigated by capillary gas chromatography-mass spectrometry. Seventy-nine fatty acids were identified: 26 saturated (iso-, anteiso-and cyclo-)
Comparative biochemistry and physiology. B. Comparative biochemistry, Aug 1, 1994
Lipid and phospholipid compositions of an endemic deep-water freshwater gammarid, belonging to th... more Lipid and phospholipid compositions of an endemic deep-water freshwater gammarid, belonging to the subphylum Crustacea, Acanthogammarus grewingkii was studied. Content of aikenylacyl, alkylacyl and diacyi forms in the main phospholipid classes (phosphatidylethanolamine and phosphatydilcholine) were established using reaction micro-thin-layer chromatography. The fatty acids compositions of total lipids, neutral, glycoand phospholipid fractions were investigated by capillary gas chromatography-mass spectrometry. Seventy-nine fatty acids were identified: 26 saturated (iso-, anteiso-and cyclo-)
Comparative biochemistry and physiology. B. Comparative biochemistry, Feb 1, 1994
Lipid and phospholipid compositions of an endemic deep-water freshwater gammarid, belonging to th... more Lipid and phospholipid compositions of an endemic deep-water freshwater gammarid, belonging to the subphylum Crustacea, Acanthogammarus grewingkii was studied. Content of aikenylacyl, alkylacyl and diacyi forms in the main phospholipid classes (phosphatidylethanolamine and phosphatydilcholine) were established using reaction micro-thin-layer chromatography. The fatty acids compositions of total lipids, neutral, glycoand phospholipid fractions were investigated by capillary gas chromatography-mass spectrometry. Seventy-nine fatty acids were identified: 26 saturated (iso-, anteiso-and cyclo-)
Comparative study of the endemic freshwater fauna of Lake Baikal-VII. Carotenoid composition of the deep-water amphipod crustaceanAcanthogammarus (Brachyuropus)grewingkii
Comparative Biochemistry and Physiology B, Aug 1, 1996
Abstract The carotenoid composition of the deep-water gammaride is reported. Astaxanthin and thei... more Abstract The carotenoid composition of the deep-water gammaride is reported. Astaxanthin and their derivatives were determined to be major components of the carotenoids (58.4%). Astaxanthin-glycoside-esters comprised 21.6% of total carotenoids. A new carotenoid glycoside ester (CGE) was isolated from the deep-water gammarideAcanthogammarus (Brachyuropus)grewingkii and its structure was elucidated. The structures were determined from spectra (1H-NMR,13C-NMR, MS, IR) after their isolation and quantification by means of semipreparative RP-HPLC and capillary GC-MS.
Knowledge Updates 2020/2
Science of Synthesis
Fatty acid amides from freshwater green alga Rhizoclonium hieroglyphicum
Phytochemistry, 2000
Freshwater green algae Rhizoclonium hieroglyphicum growing in the Ural Mountains were examined fo... more Freshwater green algae Rhizoclonium hieroglyphicum growing in the Ural Mountains were examined for their fatty acid amides using capillary gas chromatography-mass spectrometry (GC-MS). Eight fatty acid amides were identified by GC-MS. (Z)-9-octadecenamide was found to be the major component (2.26%).
The occurrence of dioic, hydroxy, branched, and unsaturated fatty acids in cyanobacteria of the g... more The occurrence of dioic, hydroxy, branched, and unsaturated fatty acids in cyanobacteria of the genus Aphanizomenon growing in different freshwater lakes has been studied. Unusual dicarboxylic (from 4.52 to 7.14%) and other fatty acids were identified by gas chromatography/mass spectrometry (GC/MS).
Molecules
This review delves into the investigation of the biological activity and structural diversity of ... more This review delves into the investigation of the biological activity and structural diversity of steroids and related isoprenoid lipids. The study encompasses various natural compounds, such as steroids with aromatic ring(s), steroid phosphate esters derived from marine invertebrates, and steroids incorporating halogen atoms (I, Br, or Cl). These compounds are either produced by fungi or fungal endophytes or found in extracts of plants, algae, or marine invertebrates. To assess the biological activity of these natural compounds, an extensive examination of referenced literature sources was conducted. The evaluation encompassed in vivo and in vitro studies, as well as the utilization of the QSAR method. Numerous compounds exhibited notable properties such as strong anti-inflammatory, anti-neoplastic, anti-proliferative, anti-hypercholesterolemic, anti-Parkinsonian, diuretic, anti-eczematic, anti-psoriatic, and various other activities. Throughout the review, 3D graphs illustrating th...
Selective Synthesis of Unsymmetrical Peroxides: Transition-Metal-Catalyzed Oxidation of Malononitrile and Cyanoacetic Ester Derivatives by tert-Butyl Hydroperoxide at the α-Position
Synthesis, May 5, 2011
ABSTRACT A novel method was developed for the selective oxidation of α-monosubstituted malononitr... more ABSTRACT A novel method was developed for the selective oxidation of α-monosubstituted malononitrile and cyanoacetic ester derivatives at the α-position based on transition-metal-catalyzed reaction (Cu, Fe, Mn, Co) with tert-butyl hydroperoxide giving unsymmetrical peroxides in 63-94% yields. The method is facile, does not require large excesses of reagents, and is amenable to gram-scale synthesis.
α-Alkyl Ketones by the Reaction of Trialkylboranes with α-Bromo Ketones
Boron Compounds, 2005
Synthesis of 5-(Dihydroxyboryl)uracil by Halogen–Metal Exchange
Addition of Thiols to Alkenylboranes
Boron Compounds, 2005
Addition of Halogens to Alkenylboranes and Alkenylboronates
Boron Compounds, 2005
Diels–Alder Reaction of Alkenylboranes and Alkenylboronates
Boron Compounds, 2005
Addition of Hydrogen Halides to Vinylboronates
Boron Compounds, 2005
α-Halo-γ,γ,γ-trichloropropylborane Derivatives by Additions to Vinylboranes and Vinylboronates
Boron Compounds, 2005
Metal-Exchange Reactions of Diazo Compounds
Boron Compounds, 2005
Synthesis of 1-Boraadamantane Derivatives via Hydroboration
Boron Compounds, 2005
Thioboration of Ethoxyacetylene
Boron Compounds, 2005
BOOK, 2023
The assumption that sea water is the cradle of the origin of primitive living organisms is beyond... more The assumption that sea water is the cradle of the origin of primitive living organisms is beyond doubt. No one
knows how this happened, but there are many assumptions, although the evidence base for all these assumptions
raises many questions. This book is an attempt to elucidate the origin of the protomembrane and its transformation
into a bilayer lipid membrane in an inanimate substance. Presumably, protomembranes consisting of fatty acids
and other amphiphiles were a simple type of membrane, but with the advent of polyols and, accordingly, complex
lipids, a new type of protomembranes appears. Perhaps this new type of protomembrane, consisting of complex
lipids, was the beginning of the emergence of the future biological membrane and all life on Earth. Coacervates
from the Oparin – Haldane hypothesis were used as a model to explain the formation of protomembranes. The
chemical model shows which polyols could spontaneously form in the primary broth, and the mathematical model
shows that ethylene glycol (40%), glycerol (33%), butane-1,2,3,4-tetraols (17%) account for 90% of all polyols
produced. This indicates the possible predominance of diol lipids in the primary primitive protomembranes. During
chemical evolution and with changes in temperature, pH, and environmental conditions, diol lipids were replaced
by glycerolipids, which have more suitable physicochemical characteristics for the formation of biological
membranes of all living organisms. The book presents polyols as part of complex lipids that are found in modern
biological membranes.