نتایج جستجو برای: chemical exchange
تعداد نتایج: 559370 فیلتر نتایج به سال:
Batch and flow methods are usually not suitable for measuring kinetics of ion-exchange reactions on soils and soil constituents. These reactions are usually very fast. Thus, a rapid kinetic method must be employed. A pressure-jump relaxation technique was used in this study to investigate the kinetics of Ca-Na and Ca-K exchange on montmorillonite. Single relaxations were observed in both system...
High density lipoprotein (HDL) cholesterol levels are associated with decreased risk of cardiovascular disease, but not all HDL are functionally equivalent. A primary determinant of HDL functional status is the conformational adaptability of its main protein component, apoA-I, an exchangeable apolipoprotein. Chemical modification of apoA-I, as may occur under conditions of inflammation or diabe...
Field-theoretic models have been used extensively to study the phase behavior of inhomogeneous polymer melts and solutions, both in self-consistent mean-field calculations and in numerical simulations of the full theory capturing composition fluctuations. The models commonly used can be grouped into two categories, namely, species models and exchange models. Species models involve integrations ...
Proton-decoupled, natural-abundance (13)C nuclear magnetic resonance spectra (obtained at 15.18 MHz by the Fourier transform method) of aqueous ferrocytochrome c, ferricytochrome c, and mixtures of both species were recorded. The 18 nonprotonated aromatic carbons of amino-acid residues and the 16 nonprotonated aromatic carbons of the heme yielded 22 narrow single-carbon resonances and 6 narrow ...
Lanthanide(III) chelates of DOTA-tetraamide ligands have been an area of particular interest since the discovery that water exchange kinetics are dramatically affected by the switch from acetate to amide side-chain donors. More recently these chelates have attracted interest as potential PARACEST agents for use in MRI. In this paper we report the results of studies using chemical exchange satur...
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