76
|
Varfolomeev SD, Lukovenkov AV. The stability of autocatalytic processes. The kinetics of oxidation of hydrocarbons. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2011. [DOI: 10.1134/s0036024411040273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
77
|
Semenova NA, Varfolomeev SD, Akhadov TA, Lukovenkov AV. Magnetic resonance spectroscopy of human brain cortex: Relationships between concentrations of some crucial metabolites. DOKL BIOCHEM BIOPHYS 2011; 436:49-52. [DOI: 10.1134/s1607672911010157] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2010] [Indexed: 11/22/2022]
|
78
|
Goldberg VM, Todinova AV, Shchegolikhin AN, Varfolomeev SD. Kinetic parameters for solid-phase polycondensation of L-aspartic acid: Comparison of thermal gravimetric analysis and differential scanning calorimetry data. POLYMER SCIENCE SERIES B 2011. [DOI: 10.1134/s156009041010101x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
79
|
Gol’dberg VM, Lomakin SM, Todinova AV, Shchegolikhin AN, Varfolomeev SD. Solid-phase polycondensation of aspartic acid 1. Kinetics of the process as evidenced by TGA and DSC data. Russ Chem Bull 2010. [DOI: 10.1007/s11172-010-0165-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
80
|
Varfolomeev SD, Lukovenkov AV. Stability in chemical and biological systems: Multistage polyenzymatic reactions. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2010. [DOI: 10.1134/s0036024410080078] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
81
|
Laptev AV, Lukin AY, Belikov NE, Zemtsov RV, Shvets VI, Demina OV, Varfolomeev SD, Barachevskii VA, Khodonov AA. Synthesis and study of the photochromic behavior of 3-[6′-nitro-1,3,3-trimethylspiro(indolino-2,2′-[2H]-chromen-5-yl)]propenoic acid and its ethyl ester. HIGH ENERGY CHEMISTRY 2010. [DOI: 10.1134/s0018143910030094] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
82
|
Varfolomeev SD, Zaikov GE. Emanuel readings 2009. THEORETICAL FOUNDATIONS OF CHEMICAL ENGINEERING 2010. [DOI: 10.1134/s0040579510030164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
83
|
Goldberg VM, Lomakin SM, Todinova AV, Shchegolikhin AN, Varfolomeev SD. Regulation of solid-phase polycondensation of L-aspartic acid. DOKLADY PHYSICAL CHEMISTRY 2009. [DOI: 10.1134/s0012501609120033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
84
|
Sud'ina GF, Kobel'kov GM, Varfolomeev SD. The macrokinetic behavior of an enzymatic system with an enzyme inactivated in the reaction. Biotechnol Bioeng 2009; 29:625-32. [PMID: 18576493 DOI: 10.1002/bit.260290511] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This study deals with the behavior of a heterogeneous multisubstrate enzymatic system under enzyme inactivation in a reaction. Electronic computer modeling data have been obtained for its macrokinetics at different modes: (1) under mixed inflow of the substrates and (2) under their spatial separation. The enzymatic membrane exhibits low sensitivity to a change in the external conditions as the substrates are intermixed on the boundary. Quite the contrary, in the case of spatial separation of the substrates, the product flow from the membrane has displayed abrupt fluctuations at different boundary conditions. This work also looks into the arrangement of the reaction zones in the membrane and their transitions under different conditions.
Collapse
|
85
|
Varfolomeev SD. Nanotechnologies as a subject matter of Biochemical Physics. CATALYSIS IN INDUSTRY 2009. [DOI: 10.1134/s2070050409030015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
86
|
Razumovsky SD, Efremenko EN, Makhlis TA, Senko OV, Bikhovsky MY, Podmaster’ev VV, Varfolomeev SD. Effect of immobilization on the main dynamic characteristics of the enzymatic oxidation of methane to methanol by bacteria Methylosinus sporium B-2121. Russ Chem Bull 2009. [DOI: 10.1007/s11172-008-0211-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
87
|
Netchvolodov KK, Kurova VS, Kononikhin AS, Savochkina YUA, Nikolaevb EN, Kupriyanova NS, Ryskov AP, Varfolomeev SD. Complexes of DNA-dependent protein kinase with single-stranded oligo-(AGGG)6: identification and possible role in modulation of ribosomal RNA transcription. DOKL BIOCHEM BIOPHYS 2009; 424:1-4. [PMID: 19341095 DOI: 10.1134/s1607672909010013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
88
|
Lushchekina SV, Nemukhin AV, Morozov DI, Varfolomeev SD. Quantum chemical justification of the specificity of enzyme catalysis: Correlations between the rate of enzyme catalysis by acetylcholinesterase and substrate structure. DOKLADY PHYSICAL CHEMISTRY 2009. [DOI: 10.1134/s0012501609050054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
89
|
Fedorovich V, Varfolomeev SD, Sizov A, Goryanin I. Multi-electrode microbial fuel cell with horizontal liquid flow. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2009; 60:347-355. [PMID: 19633376 DOI: 10.2166/wst.2009.139] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A plug flow multi-electrode bioelectrochemical reactor for wastewater treatment and simultaneous generation of electricity has been developed and its efficiency investigated. It employs a horizontally located anodic zone in which the anodic electrodes comprise porous graphite plates coated with palladium. The aerated immersed cathodic electrodes contain iron(II) phthalocyanine as a catalyst. The parameters of the device were obtained using glycerol and acetate as fuels and anaerobic sludge as an inoculum. The maximal volumetric power and current densities obtained, relative to the total volume of the anodic zone, were: glycerol: 73+/-1 mA/L; 43+/-1 mW/L; acetate: 75+/-1 mA/L; 40+/-1 mW/L. It was shown that biotransformation of glycerol into volatile fatty acids does not depend on the presence of anodic electrodes in the reaction zone, while acetate degradation takes place only if the reaction zone contains anodic electrodes as a final electron acceptor.
Collapse
|
90
|
Goldberg VM, Lomakin SM, Todinova AV, Shchegolikhin AN, Varfolomeev SD. Kinetic analysis of solid-phase polycondensation of aspartic acid. DOKLADY PHYSICAL CHEMISTRY 2008. [DOI: 10.1134/s0012501608120038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
91
|
Laptev AV, Belikov NE, Lukin AY, Barachevskii VA, Alfimov MV, Demina OV, Varfolomeev SD, Shvets VI, Khodonov AA. Spiropyran analogs of retinal: Synthesis and study of their photochromic properties. HIGH ENERGY CHEMISTRY 2008. [DOI: 10.1134/s0018143908070321] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
92
|
Varfolomeev SD. Systemic approach in the physical and structural chemistry of enzyme catalysis: From primary structure to elementary event. KINETICS AND CATALYSIS 2007. [DOI: 10.1134/s0023158407040039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
93
|
Pomytkin NA, Storozheva ZI, Semenova NA, Proshin AT, Sherstnev VV, Varfolomeev SD. Neuroprotective effect of choline succinate in rats with experimental chronic cerebral ischemia evaluated by cognitive ability tests. BIOL BULL+ 2007. [DOI: 10.1134/s1062359007020069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
94
|
Karatasso YO, Logunova IV, Sergeeva MG, Nikolaev EN, Varfolomeev SD, Chistyakov VV. Quantitative ESI-MS analysis of antiarrhythmic drugs in blood plasma without chromatographic separation. Pharm Chem J 2007. [DOI: 10.1007/s11094-007-0037-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
95
|
Pomytkin NA, Storozheva ZI, Semenova NA, Proshin AT, Sherstnev VV, Varfolomeev SD. [Neuroprotective effect of choline succinate in rats with experimental chronic cerebral ischemia evaluated by cognitive ability tests]. IZVESTIIA AKADEMII NAUK. SERIIA BIOLOGICHESKAIA 2007:183-7. [PMID: 17668462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The neuroprotective effect of choline succinate was studied in rats with chronic cerebral ischemia induced by ligation of both common carotid arteries. Two approaches were used to evaluate the neuroprotective effect: cognitive ability tests (passive avoidance test and Morris water maze test) and determination of the brain content of N-acetylaspartate, a marker of functional neurons, by 1H NMR spectroscopy in vivo. Choline succinate administration significantly improved memory and learning in ischemic rats and prevented the ischemia-induced decrease in the cerebral level of N-acetylaspartate. Thus, choline succinate demonstrated a neuroprotective effect in conditions of ischemic brain injury.
Collapse
|
96
|
Begunova EA, Chaika IA, Stepnaya OA, Safieva DO, Budashov IA, Kurochkin IN, Varfolomeev SD, Kulaev IS. Study of the effect of lysoamidase on the spore form of bacteria of the genus Bacillus. DOKL BIOCHEM BIOPHYS 2006; 408:152-4. [PMID: 16913417 DOI: 10.1134/s1607672906030124] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
97
|
Mukhametova LI, Aĭsina RB, Varfolomeev SD. [Fibrinolytic and fibrinogenolytic effects of acyl urokinase and urokinase combinations in vitro]. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2006; 32:384-90. [PMID: 16909862 DOI: 10.1134/s1068162006040042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The in vitro thrombolytic and side effects of double-strand urokinase-type plasminogen activator (tcu-PA), p-guanidinobenzoyl tcu-PA (GB-tcu-PA), and their combinations were compared. The reversible blocking of the active site stabilizes GB-tcu-PA in human plasma and results in longer thrombolysis and lesser side effects than those of tcu-PA. However, the acylated activator displays a marked lag period of thrombolytic action. GB-tcu-PA and tcu-PA combinations (molar ratios 4 : 1 and 1 : 1) induce a prolonged and effective thrombolysis without the initial lag period at a low level of plasminogen, fibrinogen, and alpha2-antiplasmin depletion in the plasma surrounding the clot.
Collapse
|
98
|
Efremenko EN, Azizov RE, Makhlis TA, Abbasov VM, Varfolomeev SD. [Determination of minimal concentrations of biocorrosion inhibitors by a bioluminescence method in relation to bacteria, participating in biocorrosion]. PRIKLADNAIA BIOKHIMIIA I MIKROBIOLOGIIA 2005; 41:429-34. [PMID: 16212040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
By using a bioluminescence ATP assay, we have determined the minimal concentrations of some biocorrosion inhibitors (Katon, Khazar, VFIKS-82, Nitro-1, Kaspii-2, and Kaspii-4) suppressing most common microbial corrosion agents: Desulfovibrio desulfuricans, Desulfovibrio vulgaris, Pseudomonas putida, Pseudomonas fluorescens, and Acidithiobacillus ferrooxidans. The cell titers determined by the bioluminescence method, including not only dividing cells but also their dormant living counterparts, are two- to sixfold greater than the values determined microbiologically. It is shown that the bioluminescence method can be applied to determination of cell titers in samples of oil-field waters in the presence of iron ions (up to 260 mM) and iron sulfide (to 186 mg/l) and in the absence or presence of biocidal corrosion inhibitors.
Collapse
|
99
|
Efremenko EN, Azizov RE, Makhlis TA, Abbasov VM, Varfolomeev SD. Determination of Minimal Concentrations of Biocorrosion Inhibitors by a Bioluminescence Method. APPL BIOCHEM MICRO+ 2005. [DOI: 10.1007/s10438-005-0064-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
100
|
Varfolomeev SD, Uporov IV, Fedorov EV. Bioinformatics and molecular modeling in chemical enzymology. Active sites of hydrolases. BIOCHEMISTRY. BIOKHIMIIA 2002; 67:1099-108. [PMID: 12460108 DOI: 10.1023/a:1020907122341] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Comparison and multiple alignments of amino acid sequences of a representative number of related enzymes demonstrate the existence of certain positions of amino acid residues which are permanently reproducible in all members of the whole family. The use of the bioinformatic approach revealed conservative residues in each of the related enzymes and ranked amino acid conservatism for the overall enzymatic catalysis. Glycine and aspartic acid residues were shown to be the most essential for structure and catalytic activity of enzymes. Amino acid residues forming catalytic subsite of the active site of enzymes are always highly conservative. Analysis revealed that aspartic acid carboxyl group is the most frequently employed nucleophilic (in deprotonated form) and electrophilic (in protonated form) agent involved in activation of molecules by the mechanism of general base and acidic catalyses in the catalytic sites of enzymes. Glycine is a unique amino acid possessing the highest possibilities for rotation along C-C and C-N bonds of the polypeptide chain. The conservative fixation of the glycine residue in polypeptide chains of related enzymes provides a possibility for directed assembly of amino acid residues into the catalytic subsite structure. It is possible that the conservative glycines provide known conformational mobility of the protein and the active site. Methods of molecular modeling were used for analysis of structural substitutions of conservative and non-conservative glycines and their effects on geometry of catalytic site of typical hydrolases. The substitution of glycine(s) for alanine significantly altered the catalytic site structures.
Collapse
|