Results 251 to 260 of about 2,134,301 (294)
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The Journal of Physical Chemistry A
Few kinetic studies are conducted in aqueous solution without the addition of an inert salt to maintain constant ionic strength. The immediate reason is to maintain constant activity coefficients, which are strongly ionic strength dependent. Rate constants are subsequently reported at a given ionic strength, or in some cases, a study of ionic strength ...
Sarah Clifford +4 more
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Few kinetic studies are conducted in aqueous solution without the addition of an inert salt to maintain constant ionic strength. The immediate reason is to maintain constant activity coefficients, which are strongly ionic strength dependent. Rate constants are subsequently reported at a given ionic strength, or in some cases, a study of ionic strength ...
Sarah Clifford +4 more
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The effect of ionic strength on alkaline phosphatase
Biochemical and Biophysical Research Communications, 1974Summary The activity of purified alkaline phosphatase from B. subtilis 168 increases as the ionic strength increases. Maximal activity is found in 2.0 M MgCl2 or CaCl2. The change in activity is paralleled by changes in fluorescence emission, in sedimentation properties and in resistance to denaturing agents.
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Nanoslit Confined DNA at Low Ionic Strengths
ACS Macro Letters, 2014We present nanoslit confined DNA conformations at very low ionic strengths and a theory to explain most measurements for single DNA molecule size under strong nanoslit confinement. Very low ionic strength conditions not only increase the DNA persistence length dramatically, but also cause DNA molecules to swell to the extent that the effective diameter
Jinyong, Lee +6 more
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Contribution of micelles to ionic strength of surfactant solution
Journal of Colloid and Interface Science, 2006A new definition of the concentration-dependent "shielding factor" has been proposed, along with its particular value at a concentration assumed to be equal to critical micelle concentration (cmc). It has been shown that herein defined shielding factor enables one to calculate the values of monomer (a(x)) and counterion activities (a(y)) which are in ...
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Effects of ionic strength on colloid deposition and release
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 1996The deposition and release of colloidal contaminants in groundwaters may be important with respect to the environmental fate of contaminants and the remediation of subsurface contamination. The objective of this paper is to present results of laboratory studies that address the effect of ionic strength on model colloid (polystyrene spheres) deposition ...
NocitoGobel, J, Tobiason, JE
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Effect of ionic strength on the binding of ascorbate to albumin
Biochimica et Biophysica Acta (BBA) - General Subjects, 2002A fluorophore-nitroxide free radical dual-functional probe (FN) was utilized to study the kinetics of ascorbate (AH(-)) binding to Bovine Serum Albumin (BSA). Since the free radical fragment in the FN probe intramolecularly quenches fluorescence, ascorbate reduction of the nitroxide function is accompanied by a concomitant fluorescence intensity ...
Evgenia, Lozinsky +5 more
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On the influence of ionic strength on the melting temperature of DNA
Journal of Theoretical Biology, 1966Abstract A simple statistical theory which has been developed by the authors and used to explain melting experiments of DNA is outlined and applied to the problem of finding a theoretical basis for the effect of ionic strength on the melting temperature of DNA.
A D, MacGillivray, A I, McMullen
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The Definition and Unit of Ionic Strength
Journal of Chemical Education, 2001The term ionic strength is defined differently in different textbooks and monographs. Some define it in terms of mol kg-1, while others define it in terms of the non-SI unit mol L-1. The conversion to the SI unit mol m3 creates a problem in computing mean ionic activity coefficients. A dimensionless ionic strength unit has also appeared.
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Ionic Strength Dependence of Protein-Polyelectrolyte Interactions
Biomacromolecules, 2003The effect of univalent electrolyte concentration on protein-polyelectrolyte complex formation has been measured by frontal analysis continuous capillary electrophoresis (FACCE) and turbidimetry for the interaction of bovine serum albumin (BSA) with a synthetic hydrophobically modified polyacid, for BSA with (porcine mucosal) heparin (Hp), a highly ...
Emek, Seyrek +3 more
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Dimerization of tetracationic porphyrins: ionic strength dependence
Journal of Inorganic Biochemistry, 1998Cationic porphyrins are under study in a number of contexts including their interaction with biological targets, as possible therapeutic agents and as building blocks for molecular devices such as molecular photodiodes and solar cells. Many cationic porphyrins dimerize readily in aqueous solution.
D W, Dixon, V, Steullet
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