نتایج جستجو برای: homotropic effect
تعداد نتایج: 1641742 فیلتر نتایج به سال:
the author intend to by studying the historical causes of the appearance of the novation in the west and explanation of its legal nature from past to present of french law, proves on the one hand that the novation does not extracted from the french civil code and in the shiite jurisprudence with quite similar terms even before the enactment of iranian civil code, was considered by the shiite su...
in this study, a simple, rapid and selective method was developed for the determination of dexamethasone. the proposed method is based on inhibitory effect of dexamethasone on the oxidation of orange-g by bromate in sulfuric acid media. the reaction was followed spectrophotometrically at 478.5 nm (?max). under optimum experimental conditions, (72.6 ?mol l-1 of orange-g, 0.76 mol l-1 of h2so4, 0...
The calcium/proton antiporter of Escherichia coli was characterized by measurement of the effect of divalent cations on the respiration-coupled quenching of the fluorescence of quinacrine or 9-aminoacridine in everted membrane vesicles. Energy-linked quenching of the fluorescence of aminoacridines is dependent on proton uptake into everted vesicles and provides an indirect assay for measurement...
““Cd and :“P NMR have been used to determine the effect of variations in the nature and stoichiometry of bound metal ion and pH on the allosteric interactions (negative cooperativity) induced on association of phosphate with the dimeric zinc metalloenzyme Escherichia coli alkaline phosphatase. At pH 8.0, successive additions of an extra two Zn’+ ions and one Mg”+ ion to the Znzs+ enzyme result ...
The Ca(2+)-sensing receptor (CaSR) regulates Ca(2+) homeostasis in the body by monitoring extracellular levels of Ca(2+) ([Ca(2+)]o) and amino acids. Mutations at the hinge region of the N-terminal Venus flytrap domain (VFTD) produce either receptor inactivation (L173P, P221Q) or activation (L173F, P221L) related to hypercalcemic or hypocalcemic disorders. In this paper, we report that both L17...
The original observation of Meyer Jackson ~ that nicotinic acetylcholine receptor (nAChR) channels may open spontaneously with the same intrinsic conductance and ion selectivity as the acetylcholine-gated channels provides strong support in favour of the Monod-Wyman-Changeux theory 2. It illustrates the interconversion of the protein between discrete conformations before ligand binding. In effe...
““Cd and :“P NMR have been used to determine the effect of variations in the nature and stoichiometry of bound metal ion and pH on the allosteric interactions (negative cooperativity) induced on association of phosphate with the dimeric zinc metalloenzyme Escherichia coli alkaline phosphatase. At pH 8.0, successive additions of an extra two Zn’+ ions and one Mg”+ ion to the Znzs+ enzyme result ...
the extent to which written corrective feedback on linguistic errors can play a role in helping l2 writers improve the accuracy of their writing continues to be an issue of interest to researchers and teachers since truscott (1996) mounted a case for its abolition. while there is growing empirical evidence that written corrective feedback can successfully target some types of linguistic error (...
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