نتایج جستجو برای: ionic strength effect

تعداد نتایج: 1838541  

The protonation constant values of salicylic and 5-nitrosalicylic acid werestudied by a combinationof spectrophotometric and potentiometric methods at 25 °C in wide range of ionic strength. The ionicstrength of solutions was kept constant by sodium perchlorate as background electrolyte at 0.10 to 3.0 moldm-3. Potentiometer was calibrated according to Gran method at each of ionic strength. The p...

2016
Ruihua Li Baoyu Gao Qinyan Yue Huaili Zheng

In this study, the cationic lignin-based flocculant was prepared and used with polyferric chloride (PFC) to treat disperse and reactive dyes wastewater. The effects of dosage, initial pH, hardness and ionic strength on the interactions and floc properties were studied. Results showed that hydroxyl and quaternary ammonium groups of LBF could combine with -NHand sulfo groups of dyes. Large flocs ...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2006
A A Mercurieva P Iakovlev E B Zhulina T M Birshtein F A M Leermakers

The (pre)wetting behavior of an annealed polyelectrolyte (PE) brush by an electrolyte solution that is strongly segregated from an apolar phase is analyzed. In this complex interface, there are interactions on various length scales. There are short-range interactions with the (uncharged) surface, and there are interactions on the length scale of the brush height. Using either the ionic strength...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2010
Zhirong Liu Lynn Zechiedrich Hue Sun Chan

To rationalize the disentangling action of type II topoisomerases, an improved wormlike DNA model was used to delineate the degree of unknotting and decatenating achievable by selective segment passage at specific juxtaposition geometries and to determine how these activities were affected by DNA circle size and solution ionic strength. We found that segment passage at hooked geometries can red...

Journal: :Biophysical journal 2005
Olli Punkkinen Per Lyngs Hansen Ling Miao Ilpo Vattulainen

As double-stranded DNA is stretched to its B-form contour length, models of polymer elasticity can describe the dramatic increase in measured force. When the molecule is stretched beyond the contour length, it further shows a highly cooperative overstretching transition. We have developed a theoretical description for this transition by coupling the two-state model and the elasticity theory pro...

Journal: :The Journal of General Physiology 1961
M. Castañeda-Agulló Luz M. del Castillo J. R. Whitaker A. L. Tappel

The kinetic effects resulting from changes in the medium ionic strength on reactions involving trypsin or alpha-chymotrypsin are different. The reaction rate increases continuously as the ionic strength increases with alpha-chymotrypsin. With trypsin, the rate increases at low ionic strengths but as the ionic strength further increases a gradual inhibitory effect is observed. The effects produc...

Journal: :The Biochemical journal 1967
M E Bramwell H Harris

1. A study was made of the sedimentation properties of purified preparations of the rapidly labelled RNA in the nucleus and the cytoplasm of the HeLa cell. The sedimentation of the rapidly labelled nuclear RNA was very sensitive to changes in ionic strength and bivalent cation concentration. Under the conditions usually used in sucrose-density-gradient centrifugation the rapidly labelled nuclea...

Journal: :The Journal of General Physiology 1938
Edwin J. Cohn Thomas L. McMeekin Muriel H. Blanchard

1. As an introduction to the relations that obtain in biochemical systems containing several components, some ionic, some dipolar ionic, the solubility of cystine has been investigated in the presence of glycine and neutral salts. 2. Both glycine and sodium chloride increase cystine solubility at all concentrations. The interaction between cystine and ions is, however, diminished with increase ...

Journal: :Analytical and bioanalytical chemistry 2015
Bitnara Kim Sohee Woo Young-Soo Park Euijin Hwang Myeong Hee Moon

This study describes the effect of ionic strength on the molecular structure of hyaluronic acid (HA) in an aqueous solution using flow field-flow fractionation and multiangle light scattering (FlFFF-MALS). Sodium salts of HA (NaHA) raw materials (∼2 × 10(6) Da) dispersed in different concentrations of NaCl prepared by repeated dilution/ultrafiltration procedures were examined in order to study ...

Journal: :Biophysical chemistry 1991
T Odijk

The electrostatics of micellar growth is reviewed and extended for solutions containing excess salt. In dilute solution the expansion of a linear micelle with increasing salt concentration is explained for a wide range of ionic strength. When the micellar charge density is very high, counterions condense nonuniformly onto the micellar rod. In that case the micelle may contract upon the addition...

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