Fourier transformed infrared absorption spectroscopy and kinetics studies of gas phase small molecules

... directed towards understanding the kinetics of elementary gas- phase reactions of small molecules using Fourier- Transformed Infrared (FTIR) absorption techniques The small molecules investigated ... Introduction 1.1 Gas phase kinetics The study of elementary gas- phase reaction kinetics, a venerable area of chemical investigation, continues to play a prominent role in our understanding of fundamental ... photolysis of nitrite species results in the formation of OH radical [24] and hence their uses as precursors of OH radicals in the studies of kinetics and mechanisms of the reactions of OH radicals...

Infrared spectroscopy and kinetics of short lived organometallic intermediates

... gaining a better understanding of many organometallic mechanisms 1.6 Objectives of the study The main aim of this study was to investigate the spectroscopy and kinetics of organometallic transient ... as organometallics A number of important terms, properties and reactions of organometallic complexes are summarized in Figures and and Table [1] In this section, some important aspects of organometallic ... Applications of organometallic complexes in homogenous catalysis Organometallic intermediates in homogeneous catalysis Spectroscopic techniques for probing organometallic intermediates Kinetics of organometallic...

Tài liệu PERFORMANCE AND SAFETY STUDIES FOR MULTI-APPLICATION, SMALL, LIGHT WATER REACTOR ( MASLWR) pptx

... steady-state performance characteristics Reactor power (MW) Steam Pressure (MPa) Outlet Quality Steam Temperature (K) Saturation temperature (K) Feedwater Temperature (K) Feedwater Flowrate (kg/s) Primary ... Flowrate (kg/s) Primary pressure (MPa) Primary mass flow rate (kg/s) Reactor inlet temperature (K) Reactor outlet temperature (K) Saturation temperature (K) Reactor outlet void fraction 150 1.52 ... Transient Performance As noted, the transient performance characterization was performed with an input file containing an early steam generator tube bundle configuration, and therefore the following...

Tài liệu Báo cáo khoa học: Structural and functional studies of the human phosphoribosyltransferase domain containing protein 1 docx

... S103 G145/D137 Y 112 D2 01/ 193 L75/67 G145/D137 E1 41/ 133 K173 /16 5 R207 /19 9 G77/69 D142 /13 4 G197 /18 9 Fig Superposition of PRTFDC1 with HPRT-ImmGP (Protein Data Bank code: 1BZY) (A) Residues in the ... Welin et al Studies of the human PRTFDC1 B A PRTFDC1 25 HPRT 20 10 00 0.2 800 600 400 0 .1 200 –50 50 10 10 50 10 015 0 200 250 S 200 –50 250 50 12 00 10 0 15 0 [Hx] (µM) 2.0 PRTFDC1 50 10 0 15 0 200 250 ... 2.0 0 .16 ± 0.02 10 .5 ± 0.9 7.4 · 10 3 ± 1. 9 · 10 3 (0.26%) 2.9 · 10 6 ± 1. 0 · 10 6 (10 0%) 36 .1 ± 14 .3 9.9 ± 0.2 2.9 ± 0.7 899 ± 11 7 1. 36 ± 0.34 406 ± 53 3.9 · 10 4 ± 9.3 · 10 3 (0.09%) 4.5 · 10 7 ± 1. 0...

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

... robust synthesis of pantothenate from low amounts of pantoate [9] Here, 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 ... [13] Details of the structural basis for the biochemically observed inhibition of plant PS by pantoate, as well as of the alleviation of this inhibition by another substrate of the enzyme, ATP, ... back to the position of the Fig Superimposition of the A-chain of nPS (green), the B-chain of nPS (cyan), and the substrate-free protein (1IHO.pdb; magenta) The carbon and oxygen atoms of pantoate...

Tài liệu Báo cáo Y học: Molecular modeling of the dimeric structure of human lipoprotein lipase and functional studies of the carboxyl-terminal domain docx

... has already established Of two possible dimeric structures of LPL, the head-tohead and the head-to-tail models, the studies of the chimeric proteins of hepatic lipase and LPL and the tandem repeat ... (Fig 4A and B, 5) The lipase activity of the K413A mutant is similar to that of wild type LPL, whereas the esterase activity is reduced to 60% of the wild type and the model structure displays no ... orientation, the catalytic site in the N-terminal domain of one subunit and the substrate recognition site in the C-terminal domain of the other face each other, thereby bringing together the substrate-binding...

Báo cáo khoa học: Human telomeric G-quadruplex: thermodynamic and kinetic studies of telomeric quadruplex stability potx

... differences in the stability of tethered and free sequences A Kinetics of human telomere quadruplex folding B Fig Thermodynamics of denaturation of human telomere quadruplex structures in buffered ... Form 1103 Telomeric quadruplex stability J B Chaires of the human telomeric quadruplex Similarly, unfolding of quadruplex forms requires only modest expenditures of energy That fact may be of biological ... Physiological relevance of telomeric G -quadruplex formation: a potential drug target BioEssays 29, 155–165 Neidle S (2009) Human telomeric G -quadruplex: The current status of telomeric G-quadruplexes as...

Báo cáo khoa học: Fluorescence quenching and kinetic studies of conformational changes induced by DNA and cAMP binding to cAMP receptor protein from Escherichia coli ppt

... uorescence studies of conformational changes induced by cyclic AMP and DNA binding to cyclic AMP receptor protein from Escherichia coli Eur J Biochem 270, 14131423 Yu S & Lee JC (2004) Role of residue ... changes induced by DNA and cAMP 19 20 21 22 23 24 25 26 27 28 29 30 31 cAMP -induced allosteric changes in T127I, S128A and T127I S128A mutants of cAMP receptor protein from Escherichia coli J ... CRP conformational changes induced by DNA and cAMP i.e free CRP, CRP (cAMP) 2 and CRP (cAMP) 4 In the presence of % 100 lm cAMP, the protein becomes activated by the formation of a CRP (cAMP) 2...

Báo cáo khoa học: Comparative biochemical and functional studies of family I soluble inorganic pyrophosphatases from photosynthetic bacteria potx

... rans phil us Vibrio cholerae Escherichia coli Rickettsia prowazekii Sulfolobus acidocaldarius Aquifex aeolicus Helicobacter pylori B ac Prokaryotic Family I sPPases * Neisseria meningitidis 925 ... (MDLSRIPPQP KAGILNVLIE IPAG), and Rhodop viridis (MRIDA IDXA), and that of Mi aeruginosa NIES-44 (MDL SRKPAQP IPGLKNVLVE TAGSINIT) [16], show a high degree of similarity with other cytosolic sPPases ... biotic and abiotic stress conditions [13,15] This work shows that cyanobacterial strains as well as diverse anoxygenic photosynthetic bacteria possess family I sPPases with different catalytic...

Báo cáo Y học: Puriﬁcation, crystallization, NMR spectroscopy and biochemical analyses of a-phycoerythrocyanin peptides pptx

... presents the puriﬁcation and molecular analyses of photoactive a-PEC peptides from phycobilisomes of M laminosus Preliminary results of crystallization and NMR spectroscopy offer reliable information ... present the 7:8 asymmetry of the allophycocyanin-linker complex, APÆLC , from Ó FEBS 2002 Analyses of a-phycoerythrocyanin peptides (Eur J Biochem 269) 5055 phycobilisomes of Mastigocladus laminosus ... solubility of peptides and at pH 7.0 recommended their employment for further studies such as crystallization and NMR spectroscopy Unfortunately, depending on light, ionic strength and pH, the peptides...

Báo cáo Y học: Unfolding and refolding studies of frutalin, a tetrameric D-galactose binding lectin doc

... spectra for Th and Ch of the Nfrutalin, Ufrutalin, Rfrutalin and Mfrutalin forms Nfrutalin had a minimum at 218 nm and a maximum at 203 nm Ufrutalin had the typical spectrum of the proteins that have ... integrifolia: amino acid sequence, predicted tertiary structure, carbohydrate recognition, and analysis of the beta-prism fold Protein Sci 8, 13–24 Sankaranarayanan, R., Sekar, K., Banerjee, R., Sharma, ... constraint analysis [19,20] as described in Materials and methods, and showed 86% of beta components (antiparallel and parallel b sheet, and b turns) and 16% of other contributions for both the native...

Báo cáo khoa học: Antimicrobial and conformational studies of the active and inactive analogues of the protegrin-1 peptide docx

... activity of the peptides A better understanding of the mode of action of these peptides is crucial for the development of a new generation of antibiotics It is known that, in the absence of both ... at the two spatial tips of the molecule, at the N-terminus with Arg1 and in the turn in the presence of Arg7 and Arg9 (see Figs and 4) The shorter analogue, BM-2, was the most ﬂexible of all the ... mechanistic step in the killing of bacteria [16,20] The conformations of the structural features determining the antimicrobial activity of protegrins Conformational studies of protegrin-1 analogues were...

Báo cáo Y học: Engineering and mechanistic studies of the Arabidopsis FAE1 b-ketoacyl-CoA synthase, FAE1 KCS pot

... Solubilization and puriﬁcation of N-terminus His-tagged FAE1 KCS Fig Hydropathy analysis of FAE1 KCS (A) Hydropathy plot of FAE1 KCS indicating the presence of several hydrophobic regions The position of the ... Taken together, the analysis of the decarboxylation activity and characterization of the mutants of the putative catalytic triad strongly support the hypothesis that the membrane-bound FAE1 KCS shares ... tentatively identiﬁed the active-site cysteine of the jojoba elongase KCS The corresponding cysteine of FAE1 KCS is Cys223 Recently, we conﬁrmed this hypothesis by site-directed mutagenesis of FAE1 KCS...

Báo cáo khoa học: Crystal structure determination and inhibition studies of a novel xylanase and a-amylase inhibitor protein (XAIP) from Scadoxus multiﬂorus pot

... kDa, a second peak of 30 kDa and a third peak of about 20 kDa A similar gel ﬁltration experiment was also carried out for the complex of XAIP with a- amylase A mixture of XAIP and a- amylase was ... observations indicate that XAIP associates with GH11 xylanase and GH13 a- amylase, as well as with both xylanase and a- amylase simultaneously Tissue distribution of XAIP The output of SDS–PAGE for ... that XAIP inhibits the activity of a- amylase in a : 1.2 molar ratio The inhibition of a- amylase by XAIP was also observed in the presence of GH11 xylanase Thus, the inhibition of a- amylase by XAIP...

Báo cáo khoa học: Site-directed mutagenesis, kinetic and inhibition studies of aspartate ammonia lyase from Bacillus sp. YM55-1 pptx

... Mechanism of aspartase from Bacillus sp YM55-1 Table Kinetic parameters for the deamination of L -aspartate by wild-type AspB and the Thr101, Asn142 and His188 mutants Steady-state kinetic parameters ... equilibration of the (R)- and (S)-enantiomers of mandelate On the basis of mutagenesis, crystallographic and kinetic isotope studies, Mitra et al [32] proposed that Glu317 in mandelate racemase ... Mechanism of aspartase from Bacillus sp YM55-1 A V Puthan Veetil et al Fig Far-UV CD spectra of wild-type (Wt) and mutant enzymes (A) Superimposed spectra of wild-type AspB and the T101A, N142A and...

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