the crystalline morphology of native celluloses
Polysaccharides - structural diversity and functional diversity
... phase is of a columnar hexagonal type [117] The N dependence of the isotropization temperature Ti is also dierent for the ether and ester derivatives The Ti of the ethers decreases with N rather ... stereo gure) on the right the energy map of Fig The snapshots of simulated chains (DP = 40) are also shown on the right side of the Kratky plots The simulated amylose chain reveals the wobble helical ... qualitatively, for the DP dependence of the radius of gyration and the dierence in the radius of gyration due to the glucosidic linkage mode When the saccharide chain is longer, the excluded volume...
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Báo cáo khoa học: Short hydrogen bonds in proteins Sathyapriya Rajagopal and Saraswathi Vishveshwara pot
... mainly from the backbone to the side chain of the same residue i The residue side chains of Glu and Gln form these kinds of SHB in most of the cases where the backbone NH donates the proton to ... SHBs All of the ˚ side chain atoms that occur within a distance of 4.5 A from the donor or the acceptor atom are said to form the environment of the residue involved in the formation of SHB The results ... 26 of these bonds are observed from the dataset Furthermore, in many of these cases, the acceptor is from the (i ) ⁄ i ) 4) residue, either from the backbone C¼O group or from a side chain The...
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A Single-Molecule Perspective on the Role of Solvent Hydrogen Bonds in Protein Folding and Chemical Reactions pptx
... the mechanical stretching of the protein and exposing the sequestered disulfide bond Pulse is the reduction of the disulfide bond in the presence of a reducing agent B) Extension profile of the ... estimate the size of the activation energy barrier of unfolding DGu The distance to the transition state, Dxu, determines the sensitivity of the unfolding rate to the pulling force and measures the ... series of steps of ~ 11 nm marking the unfolding and extension of the unsequestered residues After exposing the disulfide bonds to the solution by unfolding, we track the rate of reduction of the...
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Simple Molecular Orbitals - Sigma and Pi Bonds in Molecules pot
... below the sigma bonded carbon atoms in the plain of the page The other pi bond will lie in front and in back of the carbon atoms, perpendicular to the plane of the page On the other side of each ... that the center of the carbon atom is at the middle of the 2s orbital and at the node of all of the hybrid and p orbitals 7 Lecture superimpose orbitals (2s + 2p) C 2s add 2p The nucleus of the ... bonds on center carbon, so The hybridization of the end carbons, is sp2 (see the second only the 2s and one of the 2p's are example above) The planar shapes of the atoms of the two used in hybridization...
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Real Return Bonds, Inflation Expectations, and the Break-Even Inflation Rate ppt
... and measures of the variability of the nominal and real yields and the BEIR The drop in the mean and variability of the BEIR in the latter half of the sample coincides with a drop in the mean and ... to the price level at the bond’s issue date) of the same frequency is required By convention, the CPI index ratio used to calculate the RRB price at the first of the month is the CPI from the ... ytm ,t In the case of a nominal bond, we obtain a nominal ytm In the case of the RRB, we use the market price and the real coupon rate to obtain a real ytm In the absence of distortions, the spread...
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Quantitative Implications of Indexed Bonds in Small Open Economies Ceyhun Bora Durdu potx
... The views in this paper are solely the responsibility of the authors and should not be interpreted as reflecting the views of the Board of Governors of the Federal Reserve System or of any other ... fluctuations Because of this tradeoff, there exists a nonmonotonic relation between the “degree of indexation” (i.e., the percentage of the shock reflected in the return) and the benefits that these bonds ... income, εt is the income shock, and c is consumption to the rest of the world), which lowers the volatility of consumption On the other hand, indexation increases the volatility of the trade balance...
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Báo cáo khoa học: Role of disulfide bonds in goose-type lysozyme potx
... by the presence of disulde bonds, because removal of one or more of these linkages results in a reduction in the stability of the native state relative to the denatured state [3444] On the other ... (GlcNAc)3, as in the case of the wild-type, although the overall rates of hydrolysis were slightly affected by each of the mutations: the two mutants took 420 to hydrolyze most of the (GlcNAc)5 These results ... difcult to resolve, because the disulde bond may inuence the enthalpy and entropy of both the native and unfolded states of the protein [49] The thermal unfolding of the wild-type protein has been...
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13C–18O bonds in carbonate minerals: A new kind of paleothermometer ppt
... kind of paleothermometer ation for their D47 values of 0.341 ± 0.034 (Table 2) One of these eight samples (the D47 value of 0.27, measured on 9/ 29/2004) is a 2r outlier to the rest of the group; ... of the methods used to synthesize these calcites) Table summarizes the results of these analyses, and Figs and plot the D47 values of CO2 extracted from these calcites vs 106/T2, where T is the ... components of a single phase), it rigorously constrains the temperature of carbonate growth based on the isotopic composition of carbonate alone, independent of the isotopic composition of the water...
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Reductive Cleavage of N-O Bonds in Hydroxylamines and Hydroxamic Acid Derivatives Using Samarium Diiodide pot
... reductively cleave the N-O bond of the trifluoroaceto-hydroxamic acid derivative Despite the large number of efficient methods for N-O bond reduction, we encountered limitations of the more common ... reductions of 2-hydroxyimino amides with SmI2 in the presence of the proton source methanol.14b Interestingly, there appear to be no reports of the cleavage of N-O bonds in substrates derived from nitroso ... N-O bonds of simple hydroxylamines are shown in Table Some of the yields reported are for the acetamide or trifluoroacetamide instead of the primary amines, due to problems arising in their isolation...
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CONVERTIBLE BONDS IN A DEFAULTABLE DIFFUSION MODEL ppt
... on the same credit name, • the completeness of the model until the default time of the underlying name in terms of uniqueness of a martingale measure is studied, • a detailed specification of the ... initial wealth of a holder’s hedge Proof In view of the general results of [5, 6], we see that the process Π defined in the statement of the proposition satisfies all the assumptions for the process ... value of the embedded game exchange option explains most of the volatility risk These features suggest that for the calibration purposes it could be advantageous to use the (synthetic) prices of the...
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War Bonds in the Second World War: A Model for a New Iraq/Afghanistan War Bond? docx
... three bills have the short title of “United States War Bonds Act of 2009” and the official title of “To authorize the issuance of United States War Bonds to aid in funding of the operations in ... were responsible for the sale of nearly $186 billion worth of government securities Of this, U.S Department of the Treasury, Savings Bond Division, p 11 U.S Department of the Treasury, Savings ... Seeking to stir the conscience of Americans, it invoked both their financial and moral stake in the war The sale of war bonds provided a way in which patriotic attitudes and the spirit of sacrifice...
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The role of hydrogen sulfide in the central nervous system implications in the treatment of alzheimers disease
... common mechanisms of action of these drugs are the inhibition of the rate limiting steps of Aβ generation i.e β- and/or γ- secretases processing of APP (Citron, 2010) Although the reasoning behind ... the neurons The research group detected the significant presence of H2S in the brain homogenate preparation of CBS-/- mice (Shibuya et al., 2009) Kimura further observed that 3-MST acts together ... regions of the brain These findings suggest that impaired endogenous production of H2S has a substantial effect on pathogenesis and progression of PD Furthermore, the administration of exogenous...
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The role of hydrogen sulfide in normal and ischemic heart
... lysing the thrombi in the infarct artery The effectiveness of thrombolytic therapy is determined by the timing of the therapeutic intervention The best results are always observed when the thrombolytic ... certain forms of arrhythmia as a result of some of the calcium in the wave being pumped out of the cell by NCX (Venetucci et al., 2008) The resultant NCX current may depolarize the cell and result ... unison The impulses then pass to the atrioventricular (AV) node, and the signal is further conducted by a specialized muscle fiber, Purkinje fibers, to the apex of the heart and throughout the ventricular...
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Role of hydrogen sulfide in the pathogenesis of parkinsons disease
... >95% of the net H2S production by CBS On the contrary, the preferred substrates for CSE are Cys and Hcy Together they contribute well over 90% of the net H2S production by CSE In addition, the ... been used to determine the significance of the endogenously generated H2S These agents are able to inhibit the biosynthesis of H2S from Cys but they are general inhibitors of all PLP-dependent ... not in endothelium On the other hand, the vasorelaxation of H2S on aortic rings was not altered by the removal of endothelium However, Zhao et al later demonstrated that although the H2S-induced...
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The role of hydrogen sulphide in the cardiovascular system emphasis on haemorrhagic shock
... TNF-α and IL-1β levels The authors of these studies also demonstrated that these effects of NaHS were dependent upon the activation of TRPV1 receptor and the subsequent release of neuropetide and ... inhibition of iNOS restored the normal catecholamine-mediated up-regulation of alveolar liquid clearance Some of these deleterious effects of NO could be attributed to the formation of RNS (see ... some these “regulatory” mechanisms are simply the result of altered L-cysteine levels in the various tissues 1.2.3 Metabolism of H2S The figure below shows the known pathways and metabolites of...
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A novel role of hydrogen sulfide in wound healing and a new approach to wound dressing in rat model
... the rat 1.3 Thesis Overview and Scope The aim of the work presented in this thesis is to determine the role of H2S in skin wound healing and the effect of PAG pretreatment Accordingly, the main ... properties and effects as the inhibitor of H2S synthesizing and H2S donor; assembly of hydrogel in wound dressing and the study of the PAG-incorporated hydrogel The details of materials and methods ... possible interaction of these gases at the expression level of their synthesizing enzymes At the level of vascular smooth muscle cells, for example, H2S has been reported to either enhance [33,...
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Role of hydrogen sulfide in the cardiovascular system implications for treatment of cardiovascular diseases
... function of these channels in the heart Therefore, the effect of H2S on APD is probably attributed to the opening of KATP channels86 H2S is capable of opening KATP channels directly87, 88 Furthermore, ... probably reflect the status of H2S activity Whether such changes in H2S level are the causes or consequences of these diseases warrants further investigations 1.3.5.1 Effect of H2S on atherosclerosis ... Catabolism of H2S The vast majority of H2S is oxidized to sulfate which leaves the body via the kidneys 42, 66-68 The primary site for this oxidation is in the liver, but all cells in the body...
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MOLECULAR AND FUNCTIONAL CHARACTERISATION OF THE ROLE OF HYDROGEN SULPHIDE IN SEXUAL MEDICINE
... rings and the catheter was inserted such that the bevelled end headed towards the lungs The cathether and the trachea were tied together so as to secure the cathether in position The right common ... blood inflow to the lacunar spaces increases Relaxation of the smooth muscle of the trabeculae then dilates the lacunae, allowing for the expansion of the erectile tissue against the tunica albuginea ... that the bioavailability of one gas may be modulated by another as the binding by one would reduce the binding of the other gases to hemoglobin (Wang, 2002) This balanced metabolism at the cellular...
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Therapeutic effect of hydrogen sulfide in a parkinsons disease model
... associated with the loss of dopaminergic neurons and the decrease of dopamine (DA) in the substantia nigra (SN) [6] One hallmark of PD pathology is the presence of Lewy Bodies (LBs) in the dopaminergic ... relieving the PD symptoms in patients, chronic treatment with L-Dopa would lead to the suppression of endogenous synthesis of DA and the disruption of DA system Patients would experience the wear-off ... compensate for the decline of DA in the brain [121] Administration of L-Dopa efficiently reverses the motor dysfunction in the patients However, only 1-5% of L- 8 Dopa is distributed to the centre...
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