reaction mechanism of hladh
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 ... and fungal glucoamylase Ó FEBS 2004 Reaction mechanism of isopullulanase (Eur J Biochem 271) 4425 Fig Comparison of the active site structures of the model of IPU (A) and Dex49A (B) Conserved...
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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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Báo cáo khoa học: Spectroscopic investigation of the reaction mechanism of CopB-B, the catalytic fragment from an archaeal thermophilic ATP-driven heavy metal transporter potx
... Hydrolytic mechanism of the catalytic CPx-ATPase domain Fig Investigation of the ATPase reaction by FTIR spectroscopy (A) Time course of ATP photo-release from cgATP The absorbance changes of the ... excess, offering an explanation of why the KM value of the ATPase reaction is relatively high compared with the lig fairly low equilibrium binding constant Kdiss of ATP Conclusions Partial reactions ... et al ă Hydrolytic mechanism of the catalytic CPx-ATPase domain Kinetic modelling Simulation of concentration proles of educts, products and reaction intermediates by means of the intrinsic rate...
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Báo cáo Y học: Kinetic and biochemical analyses on the reaction mechanism of a bacterial ATP-citrate lyase ppt
... occurred in the absence of CoA Taking into account the reaction mechanism of mammalian ACL [23], the nal step of the reaction can be assumed to be the nucleophilic attack of CoA to the phosphorylated ... Examination of the inhibitory effect of ADP As an increased ratio of ADP towards ATP signicantly inhibits Cl-ACL activity, we investigated the effect of ADP on the phosphorylation of AclA Addition of ... lyase of rat liver III The reaction mechanism J Biochem 63, 89100 21 Pearson, P.H & Bridger, W.A (1975) Catalysis of a step of the overall reaction by the a subunit of Escherichia coli succinyl...
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Báo cáo khoa học: Catalytic reaction mechanism of Pseudomonas stutzeri L-rhamnose isomerase deduced from X-ray structures doc
... with the catalytic reaction [8] Many structural studies of d-XI have been performed to understand its catalytic reaction mechanism [8–19] Two types of mechanism, the ene-diol mechanism [9] and ... catalytic reaction mechanism From the results of the X-ray structural study, we deduced the catalytic reaction mechanism of P stutzeri l-RhI, as shown in Fig 1052 Before the binding of a substrate, ... the hydrideshift mechanism (right) for aldose–ketose isomerization, but the catalytic reaction mechanism is still not entirely understood First, the mechanism for the ring opening of a substrate...
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catalytic activity and reaction mechanism of au,tio2 for the reduction of nox by propene
... Effect of CeO2 on the formation of adsorbed species 80 6.2.3 Effect of CeO2 on the consumption of adsorbed species 86 6.2.4 Conclusions of the influence of CeO2 on the reaction mechanism ... fulfillment of requirements for a doctoral degree of engineering Catalytic activity and reaction mechanism of Au/TiO2 for the reduction of NOx by propene By Nguyen Quang Long 06D51501 (Supervised by Professor ... Figure 2-9 Proposed mechanism of C3H6-SCR over Cu/Al2O3 [43] 24 Chapter 2: Review of related literature In the case of Ag/Al2O3, one of the roles of Ag is to promote the oxidation of NO to adsorbed...
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PROJECT - REACTION MECHANISM OF REACTIVE DYES IN ON CELLULOSE FIBER.
... exhausted on to the fibre Dyeing mechanism of reactive dye: Fixation: Fixation of dye means the reaction of reactive group of dye with terminal –OH or-NH2 group of fibre and thus forming strong ... is the most reactive Dyeing mechanism of reactive dye: The dyeing mechanism of material with reactive dye takes place in stages:1.Exhaustion of dye in presence of electrolyte or dye absorption ... deficiency of reactive dyes during dyeing & causes and remedies of deficiency of reactive dyes During reactive dyeing there is a rule of using different amount of soda ash with fixed amount of salt...
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Báo cáo khoa học: Mechanism of the reaction catalyzed by dehydroascorbate reductase from spinach chloroplasts doc
... reciprocals of the concentrations of GSH (B) Reciprocals of initial rates of reduction of DHA were plotted against the reciprocals of concentrations of GSH at fixed concentrations of DHA The concentrations ... concentration of one substrate at various fixed concentrations of the other substrate (A) Reciprocals of initial rates of reduction of DHA are plotted against the reciprocals of concentrations of DHA ... cycle of the DHAR reaction, as GSSG is produced from two molecules of GSH We performed product-inhibition studies to confirm the order of binding of DHA and GSH to DHAR Doublereciprocal plots of reaction...
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Supported nanosized gold catalysi the influence of support morphology and reaction mechanism 2
... an ion current density of 10-9 A cm-2 the life-time of a monolayer is in the order of some hours Essentially static SIMS provides a mass spectrum of the surface The mix of elemental and cluster ... (IR) The study of the formation and reactivity of surface intermediates is an important subject of surface science and heterogeneous catalysis One of the best tools for this kind of investigation ... lines of insulating solids are of the order of 0.5 eV wider than photoelectron lines of conductors Auger lines are observable in XPS spectra, due to relaxation of the excited ions left after...
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Supported nanosized gold catalysi the influence of support morphology and reaction mechanism 3
... of CO as a function of reaction temperature over four kinds of gold/ iron oxide samples as prepared (a), calcined in air at 200 oC for 1hour (b), and calcined in air at 300 oC for 1hour (c) Reaction ... function of reaction temperature over four kinds of as-prepared Au/ iron oxide samples Reaction conditions: 1%CO+2%O2+70%H2 in He, GHSV: 60,000 cm3 g-1 h-1 71 Figure 3.11 exhibits the CO conversion of ... conclusions.33 The CO conversion of both CO oxidation reaction and PROX reaction over AuCP and AuDP samples decreased after reaching 100% conversion, while the CO selectivity of RROX reaction remained similar...
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Supported nanosized gold catalysi the influence of support morphology and reaction mechanism 4
... preferential oxidation of CO in the presence of hydrogen, the feed gas was a 70%H2 + 1%CO + 2%O2 mixture, introduced into the reactor at a GHSV of 60,000 103 cm3g-1h-1 For both reactions, the reaction products ... after 20 hours 10 hours of 10 M NaOH hydrothermal processing at 120oC, end of tube TiO2 after 20 hours of 10 M NaOH hydrothermal processing at 120oC TiO2 after 24 hours of 10 M NaOH hydrothermal ... with a flow of air (100 ml/min) for h at 200 or 300oC For CO oxidation reactions, the feed gas was a mixture of 90%He + 5%CO + 5%O2, introduced at a gas hourly space velocity (GHSV) of 60,000 cm3g-1h1...
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Supported nanosized gold catalysi the influence of support morphology and reaction mechanism 5
... graph of three kinds of Au/CuO samples (a) Au/CuO (CB) (b) Au/CuO (NP) (c) Au/CuO (NF) Au atom% in three kinds of Au/CuO samples from XRF, BET results of three kinds of CuO, and three kinds of Au/CuO ... still a lot of controversial and uncertain topics in this area of study For example, the reaction mechanism and factors that can affect the reaction remain debatable It has ... that of other three samples, suggesting smaller amount of movable oxide ions The presence of Au greatly enhances the reducibility of CuO(CB) Under similar experimental conditions (amount of the...
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Supported nanosized gold catalysi the influence of support morphology and reaction mechanism 6
... achieve very good activity In-situ DRIFTS study of the CO oxidation over Au/CuO could detect the presence of various Au species as well as a variety of reaction intermediates including formate, carbonate, ... derivation of a reaction mechanism similar to those proposed by G.C Bond and H.H Kung All these results provide deep insights on the gold catalysis and valuable guidance for future study of it In ... to the enhanced activity of the AuCH sample In Chapter Au supported on six different types of TiO2 are studied Compared to the commercial anatase TiO2(CB) and kinds of TiO2 samples from KAISHA...
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Supported nanosized gold catalysi the influence of support morphology and reaction mechanism 1
... this chapter is the study of reaction mechanism of CO oxidation over Au/CuO system In-situ DRIFT is able to identify the reaction intermediates and provide evidence for the mechanism investigations ... spectroscopic measurements often observed the presence of carbonate or formate or acetate as the intermediates of the CO oxidation Additionally moisture or small amount of water in the reaction system is ... observations.49,51,97,100-105 In Chapter of this thesis the support effect, in particular the direct involvement of OH in CO oxidation, will be discussed carefully 1.6 Reaction Mechanism of Low Temperature CO Oxidation...
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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: Reaction mechanisms of thiamin diphosphate enzymes: redox reactions pdf
... deprotonation of C2a-OH of HEThDP and protonation of FAD at N5 and N1) The tight and rigid binding of both cofactors excludes a direct carbanion mechanism with covalent linkage between C2a of the HEThDP ... radical An additional intricacy of this mechanism is the necessity of a structural rearrangement of CoA in the course of catalysis: initially, the reactive thiol group of CoA must be positioned proximal ... intermediate only in the stepwise mechanism Frey et al could isolate AcThDP in the steady Redox reactions of thiamin diphosphate enzymes state of the overall reaction of PDHc by acid quench trapping...
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