mechanism of butadiene polymerization
Báo cáo khoa học: Branched chain mechanism of polymerization and ultrastructure of prion protein amyloid fibrils ppt
... r>1 r >> probability of formation of new active centers probability of loss of active centers 3757 Branched chain mechanism of polymerization I V Baskakov The nucleation -polymerization model ... Branched chain mechanism of polymerization consistent with the mechanism of branched-chain reactions Employing the theory of branched-chain reactions will greatly benefit our understanding of the prion ... branched-chain mechanisms (C) The branchedchain mechanism predicts that the length of the lag-phase and the polymerization rate are controlled by the r-value Schematic representation of four polymerization...
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Báo cáo y học: "Ultra-low microcurrent in the management of diabetes mellitus, hypertension and chronic wounds: Report of twelve cases and discussion of mechanism of action"
... major role in the pathogenesis of both types of diabetes mellitus High levels of free radicals and the decline of antioxidant defense mechanisms lead to damage of cellular organelles and enzymes, ... effects on diabetes, hypertension and wound healing Presumably, one of mechanisms of action is its antioxidant activity The action of EPRT is to produce electrical pressure rather than an electrical ... development of the oxidative stress (68) If our findings are proven by further studies involving a larger number of patients, ultra-low microcurrent therapy might change the concept of management of chronic...
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Tài liệu ECCENTRIC MECHANISM OF FOUR-BAR LINKAGE pptx
... of top hole of the arm_asm sub-assembly with the axis A_2 of post – see figure below 40 For Translation constraint, 41 Pick the circular face in the back of arm as shown Pick the front face of ... axis A_4 of the right hole of the link, and then pick the axis A_4 of the pin at eccentric For Translation constraint, select the back face of the link, and then pick the front large face of the ... of the link As Axis alignment constraint, select the axis A_3 of the left hole of the link, and then pick the axis A_12 of the pin at arm 45 For Translation constraint, select the back face of...
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Tài liệu Báo cáo " Mechanism of forming the Dien Bien basin " pdf
... depth of 160m in the central part of basin This is a product of tectonic activities of the Dien Bien - Lai Chau fault zone in Pliocene-Quaternary time and is one of the bases for determining age of ... formation of the Dien Bien basin The geological structure of the Dien Bien basin is composed of main parts: the basement consists of Triassic sedimentary bedrock and the cover consists of NeogeneQuaternary ... thesis, Institute of Geology, VAST, Hanoi, 2002 (in Vietnamese) [2] Ministry of Heavy Industry, Ministry of Construction, General Department of Geology, Report on investigation of the geological...
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Tài liệu Báo cáo khoa học: X-ray crystallographic and NMR studies of pantothenate synthetase provide insights into the mechanism of homotropic inhibition by pantoate docx
... effects of one of the substrates, i.e pantoate [8,9] One of the interesting features of the plant PSs is the presence of a conserved 24 residue insertion in the sequence [9] This sequence of amino ... we report the results of the structural studies of the pantoate-bound form of the N-terminal domain of E coli PS (nPS) The structure and substrate-binding interactions of E coli nPS have been ... the alleviation of this inhibition by another substrate of the enzyme, ATP, are presented [8,9] Results Solution properties of the N-terminal domain of PS, the C-terminal domain of PS, and full-length...
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Tài liệu Báo cáo khoa học: Modeling of tRNA-assisted mechanism of Arg activation based on a structure of Arg-tRNA synthetase, tRNA, and an ATP analog (ANP) ppt
... proton of NeH of –Ne+H@C–(NH2)2 of the Arg moiety with the cyclic configuration of Arg-tRNA is transferred to C@O of the ester bond of Arg-tRNA The adenosine moiety of AMP is omitted the formation of ... chains of Pro34 and Leu38 N1 and N6 of the base of A20 lie close to Nd2 and Od1 of the side chain of Asn87 in the S4 strand, with ˚ ˚ distances of 2.82 A and 2.97 A, respectively The plane of the ... group of Asn87 is positioned far out of the base plane Large values of average B-factor of resi- Modeling of tRNA-assisted mechanism on ArgRS dues in the N-terminal domain (average B-factors of...
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Tài liệu Báo cáo khoa học: Hypoxic resistance to articular chondrocyte apoptosis – a possible mechanism of maintaining homeostasis of normal articular cartilage pdf
... surfaces of natural killer (NK) cells, as well as on CD4+ and CD8+ T cells It promotes apoptosis, which may aid in the resolution of infection and the attenuation of the development of streptoxotocin-induced ... a wide range of responses, depending on cell type and levels of ROS within the cell [23,24] The aims of this study were to investigate the major signalling pathways and effects of hypoxic conditions ... Evaluation of articular cartilage after experimentally induced osteoarthritis (A) Photomicrographs of articular cartilage (B) The evaluation of osteoarthritis in the right and left joints of dogs...
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Tài liệu Báo cáo khoa học: Mechanism of dihydroneopterin aldolase NMR, equilibrium and transient kinetic studies of the Staphylococcus aureus and Escherichia coli enzymes docx
... deuteration of C2¢ of the epimerase product The lack of deuteration of the C2¢ of DHMP is not due to the lack of deuterons, because it has been shown previously that the 6-hydroxymethyl group of the ... intermediate as that of the aldolase reaction or the mechanism of deprotonation and reprotonation of C2¢ can be tested by NMR The key difference between the two reaction mechanisms is that H2¢ ... signals of all 2¢ and 3¢ protons of DHNP and DHMP are well separated, except those of the 3¢Hb protons of the two compounds, which are overlapping The proton occupancy at the 2¢ position of the...
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Tài liệu Báo cáo khoa học: Catalytic mechanism of SGAP, a double-zinc aminopeptidase from Streptomyces griseus pdf
... range of the expected ioniza- Mechanism of an aminopeptidase from S griseus tion of a zinc-bound water ⁄ hydroxide in solution, DHion of 20–30 kJÆmol)1 [52] The enthalpy of ionization of a carboxylic ... FEBS Y F Hershcovitz et al Mechanism of an aminopeptidase from S griseus A Fig Plot of pKa versus the inverse temperature for the hydrolysis of Leu-pNA The enthalpy of ionization, DHion ¼ 30 kJÆmol)1, ... detailed sequence of zinccoordination changes during catalysis and the mode of inhibition of anions such as fluoride and phosphate Experimental procedures Purification of SGAP The cloning of the SGAP...
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Tài liệu Báo cáo khoa học: Antifungal effects and mechanism of action of viscotoxin A3 docx
... generation of H2O2 in spores [9,15–18] In this work we have gained more information on the cellular targets and the mechanism of action of vis- cotoxins, by examining the interaction of VtA3 with ... isoform, VtA3, with biological membranes and obtain information on its mechanism of action, we have applied different techniques as shown below The exact composition of the lipid membranes of ... any of the voltages assayed in the pulse protocol In the 0.1–1 lm range of added VtA3 (n ¼ 12; 44% of the active patches), we found ion-channel-like activity in the form of square pulses of current...
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Tài liệu Báo cáo khoa học: Manipulation of prenyl chain length determination mechanism of cis-prenyltransferases ppt
... parts of sequences of the mutants of M luteus B-P 26 UPP synthase (EKE, RAKDY) and of Srt1p (Srt1p-delta) are shown (B) TLC autoradiograms of polyprenyl alcohols corresponding to products of cis-prenyl ... described [29] In order to understand the molecular mechanisms of chain length determination, we built structural models of Rv1086 and of LLLH mutant of M luteus UPP synthase using the E coli UPP synthase-E,E-FPP ... structure of E,EFPP complex of UPP synthase from E coli (Protein Data Bank No 1V7U) Then, structures of E,E-FPP and IPP, which were identified from the complex structure of IPP and the D26A mutant of...
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Tài liệu Báo cáo khoa học: On the mechanism of action of the antifungal agent propionate Propionyl-CoA inhibits glucose metabolism in Aspergillus nidulans doc
... d, length of light path of the cuvette], which considers the decrease of the concentration of oxaloacetate in equilibrium with L-malate during the formation of NADH (the concentrations of malate ... decrease of the oxaloacetate concentration in the equilibrium due to the accumulation of NADH [25] Lineweaver–Burk diagrams were obtained by use of the worksheet of the program EXEL 98 (Microsoft ... action of propionyl- Ó FEBS 2004 CoA and acetyl-CoA In the presence of both thioesters one might expect an accumulation of succinyl-CoA in the cell and a deadlock of further reactions of the...
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Tài liệu Báo cáo khoa học: nsights into the reaction mechanism of glycosyl hydrolase family 49 Site-directed mutagenesis and substrate preference of isopullulanase doc
... composed of residues 25–540 The overall structure of the model of IPU and the mutated residues in this study are shown in Fig To elucidate the mechanism of the substrate recognition of IPU, two ... a-(1fi4)-linked glucose units of pullulan (Fig 4A) IPU is an anomer-inverting enzyme Comparison of the active sites of the model of IPU and Dex49A The active site structures of the model of IPU (Fig 4A) and ... using NMR spectroscopy [17] To compare the mechanism of hydrolysis of IPU and other GH family 49 dextranases, the anomer configuration of the hydrolysate of IPU was determined A polarimetric assay...
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Tài liệu Báo cáo khoa học: The mechanism of a-proton isotope exchange in amino acids catalysed by tyrosine phenol-lyase doc
... abstraction of the a-proton For the reaction of TPL with L-methionine the rate of abstraction of the a-proton, leading to formation of the quinonoid intermediate, is less by a factor of 2.5 than ... examined the mechanisms of isotopic exchange of a-proton catalyzed by TPL in reactions with L-phenylalanine and L-methionine which may be considered as typical representatives of the two groups of amino ... statistical factor taking account of the ratio of protons and deuterons on the considered group when the latter is polyprotic; (c) the degree of restriction of the free rotation of the considered group...
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Tài liệu Báo cáo khoa học: Unraveling the catalytic mechanism of lactoperoxidase and myeloperoxidase A reflection on some controversial features Elena Ghibaudi and Enzo Laurenti docx
... addressing each of these questions, we will propose a new hypothesis that describes an integrated vision of the catalytic mechanism of MPO and LPO A brief survey of the absorption features of MPO, LPO ... other hand, this fact does not represent proof of the presence of one or two oxidizing equivalents on the decay product of Cpd I The EPR spectrum of a spin-trapped radical in MPO Cpd I has been ... mono-electronic reaction A comparison of the experimental behaviours of MPO and LPO in the presence of peroxide might help to solve some of these issues The mono-electronic oxidation of H2O2 generates superoxide...
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Tài liệu Báo cáo khoa học: A role for the intersubunit disulfides of seminal RNase in the mechanism of its antitumor action docx
... aminoethanethiosulfonate of the sulfhydryls exposed by selective reduction of the Table Monomeric derivatives of BS-RNase LC50 is the protein concentration producing 50% of cell death Mixed LC50 ... action of CRI We tested the cytotoxic activity of the monomeric derivatives described above on malignant SVT2-3T3 broblasts by measuring cell survival after 48 h of growth in the presence of increasing ... 10-fold molar excess of dithiothreitol [19] This hyperreactivity is a feature also of the mixed disuldes formed by Cys31 and Cys32 with glutathione [12], and of the mixed disuldes of MSSAE (unpublished...
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Tài liệu Báo cáo khoa học: Mechanism of protection of peroxidase activity by oscillatory dynamics docx
... of the mechanism for inactivation of the enzyme may come from measurement of the effect of the concentration of the aromatic cofactor responsible for the onset of oscillations Here we use the fact ... increasing the concentration of the aromatic cofactor Note that the steady state concentration of superoxide is essentially independent of the concentration of the cofactor The difference in steady ... Kinetics of the formation of p-670 and of the decay of compound III of horseradish peroxidase Arch Biochem Biophys 327, 279284 39 Hawkins, C.L & Davies, M.J (2001) Generation and propagation of radical...
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Tài liệu Báo cáo Y học: Insights into the reaction mechanism of Escherichia coli agmatinase by site-directed mutagenesis and molecular modelling ppt
... positions of other Fig Scheme of the binuclear manganese cluster and the localization of the side-chains of Asp153 and Asn153 in the modelled structures of wild-type and D153N mutant forms of E coli ... (Fig 5) Moreover, one of the carboxylate oxygens of Asp153 and the carboxamide oxygen of Asn153 are positioned in such a way as to allow metal coordination interaction with one of the manganese ions ... revealed by the conservation of the whole topology of the active site, would explain the essentially unaltered interaction of the D153N variant with the metallic cofactor In the modelled structure,...
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Tài liệu Báo cáo Y học: Dynamic mechanism of nick recognition by DNA ligase ppt
... lead to a decrease of the degree of hydration of the bound DNA As a 5996 A V Cherepanov and S de Vries (Eur J Biochem 269) Ó FEBS 2002 Fig Illustration of the proposed mechanism of dynamic nick ... 5¢-phosphate of the nick and backwards in the 5¢-direction of the nicked strand Fig Illustration of the proposed mechanism of dynamic nick recognition by DNA ligase Positioning of the reacting ... motion is connected with binding of both ATP and nicked dsDNA [25] As to ATP, closing of domain was proposed to adjust the conformation of the b–c pyrophosphate of ATP to a position favorable for...
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