Studies of the cation exchange system Fe+++-H+: I. Equilibrium studies

AIChE Journal ◽  
1959 ◽  
Vol 5 (3) ◽  
pp. 391-393
Author(s):  
R. C. Vasishth ◽  
M. M. David
Keyword(s):  
Cation Exchange ◽  
Exchange System ◽  
Equilibrium Studies

Fractionation of rare earth elements within bone mineral: A natural cation exchange system

2011 ◽  
Vol 310 (1-2) ◽  
pp. 124-132 ◽  
Author(s):  
Clive N. Trueman ◽  
László Kocsis ◽  
Martin R. Palmer ◽  
Chris Dewdney
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Cation Exchange ◽  
Bone Mineral ◽  
Exchange System

Kinetics and Equilibrium Studies for the Removal of Cobalt, Manganese, and Silver in Ethanol using Dowex 50W-x8 Cation Exchange Resin

2014 ◽  
Vol 49 (12) ◽  
pp. 1848-1859 ◽  
Author(s):  
Philiswa N. Nomngongo ◽  
J. Catherine Ngila ◽  
Titus A. M. Msagati ◽  
Brenda Moodley
Keyword(s):  
Cation Exchange ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Equilibrium Studies

Cation-exchange equilibrium and mass balance in the lichen Umbilicaria muhlenbergii

1976 ◽  
Vol 54 (8) ◽  
pp. 720-723 ◽  
Author(s):  
E. Nieboer ◽  
P. Lavoie ◽  
R. L. P. Sasseville ◽  
K. J. Puckett ◽  
D. H. S. Richardson
Keyword(s):  
Cation Exchange ◽  
Mass Balance ◽  
Metal Ion ◽  
Ion Uptake ◽  
Exchange Mechanism ◽  
Exchange Equilibrium ◽  
Equilibrium Studies ◽  
Metal Ion Uptake

Equilibrium studies on the thallus of U. muhlenbergii (Ach.) Tuck. confirmed that the mass balance of the exchange of Ni2+ for Sr2+, Sr2+ for Tl+, and Sr2+ for H+ was consistent with a cation-exchange mechanism of metal-ion uptake.

scholarly journals Hemoglobin Görwihl [α2β25(A2)Pro→Ala], an Electrophoretically Silent Variant with Impaired Glycation

2003 ◽  
Vol 49 (1) ◽  
pp. 137-143 ◽  
Author(s):  
Emmanuel Bissé ◽  
Claude Schauber ◽  
Nathalie Zorn ◽  
Thomas Epting ◽  
Antonin Eigel ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Functional Properties ◽  
Ionization Mass ◽  
Equilibrium Studies ◽  
Hb A1c ◽  
Mild Degree ◽  
Boronate Affinity Chromatography ◽  
Β Chain ◽  
Recombination Kinetics ◽  
Cation Exchange Hplc

Abstract Background: Some of the genetic variants of hemoglobin (Hb) and their chemically modified species are known to affect the measurement of Hb A1c. The purpose of this study was to characterize Hb species in the blood sample of a 74-year-old German male with an exceptionally low Hb A1c value. Methods: Hemolysates from the propositus and a healthy individual were analyzed by electrophoresis, cation-exchange HPLC, boronate affinity chromatography, and electrospray ionization-mass spectrometry (ESMS). Genomic DNA was amplified by PCR, and the sequencing was performed on an ABI 310 sequencer. Functional properties of Hb were determined by oxygen equilibrium studies and CO recombination kinetics after flash photodissociation. Glycohemoglobin species were synthesized by incubating hemolysates with glucose. Results: A novel, electrophoretically silent β chain, β5(A2)Pro→Ala or Hb Görwihl, was detected by cation-exchange HPLC. It accounted for ∼44% of the total Hb and had functional properties similar to those of normal Hb A and a mild degree of heat instability. During incubation with glucose, glycation of the β chains (assessed by ESMS) in the hemolysate of a healthy volunteer was twice as fast as in hemolysate from the propositus. Conclusions: The substitution β5(A2)Pro→Ala seems to affect neither the functional properties nor the heterotropic interactions of Hb, but slows glycation of the N-terminal valine by an unknown mechanism.

scholarly journals Ionic Control of the Reversal Response of Cilia in Paramecium caudatum

1968 ◽  
Vol 51 (1) ◽  
pp. 85-103 ◽  
Author(s):  
Yutaka Naitoh
Keyword(s):  
Cation Exchange ◽  
Calcium Ions ◽  
Time Course ◽  
Calcium Release ◽  
Published Data ◽  
Paramecium Caudatum ◽  
Exchange System ◽  
Contractile System ◽  
Ciliary Reversal ◽  
Final Amount

The duration of ciliary reversal of Paramecium caudatum in response to changes in external ionic factors was determined with various ionic compositions of both equilibration and stimulation media. The reversal response was found to occur when calcium ions bound by an inferred cellular cation exchange system were liberated in exchange for externally applied cations other than calcium. Factors which affect the duration of the response were (a) initial amount of calcium bound by the cation exchange system, (b) final amount of calcium bound by the system after equilibration with the stimulation medium, and (c) concentration of calcium ions in the stimulation medium. An empirical equation is presented which relates the duration of the response to these three factors. On the basis of these and previously published data, the following hypothesis is proposed for the mechanism underlying ciliary reversal in response to cationic stimulation: Ca++ liberated from the cellular cation exchange system activates a contractile system which is energized by ATP. Contraction of this component results in the reversal of effective beat direction of cilia by a mechanism not yet understood. The duration of reversal in live paramecia is related to the time course of bound calcium release.

scholarly journals Kinetics and Thermodynamics of Mg-Al Disorder in MgAl2O4-Spinel: A Review

Molecules ◽  
2019 ◽  
Vol 24 (9) ◽  
pp. 1704 ◽  
Author(s):  
Yunlu Ma ◽  
Xi Liu
Keyword(s):  
Cation Exchange ◽  
Exchange Reaction ◽  
Structural Features ◽  
Model Parameters ◽  
Exchange Equilibrium ◽  
Equilibrium Studies ◽  
Kinetics And Thermodynamics ◽  
Mgal2o4 Spinel ◽  
Cell Parameters ◽  
Cation Exchange Reaction

The MgAl2O4-spinel has wide applications in various industries and in geosciences. It shows a significant inter-site Mg-Al cation exchange (denoted by the inversion parameter x), which modifies structural features, such as the unit-cell parameters and the sizes of the component polyhedra, and influences the physical and chemical properties. Previous studies mainly focused on the kinetics and thermodynamics of the Mg-Al exchange reaction, with the aim to ascertain the correlation between the inversion parameter and temperature; these studies, however, reached conflicting results. Here, we first reviewed the kinetics studies on the Mg-Al cation exchange reaction, and then reviewed all thermodynamic experiments, with special attention paid to the Mg-Al cation exchange equilibrium and the quench process, which might have modified the cation distributions once attained at high temperatures. We also assessed the accuracies in the temperature measurements and in the quantifications of the x by different analytical methods. With some necessary temperature correction and data removal, we have landed with a generally reliable x-T dataset covering the T-x space of 873 < T < 1887 K and 0.18(1) < x < 0.357(60) (71 data pairs in total). Fitting these x-T data to three most commonly used thermodynamic models, we have obtained more accurate model parameters. Further, we also evaluated the constituent items of the Gibbs free energy for the Mg-Al cation exchange reaction with experimental results from different research fields and reached the conclusion that highly possibly the T Δ S D should not be neglected. Based on this review, we suggest that: (1) Further kinetics study on the Mg-Al exchange reaction should be performed at both low T (<~973 K) and high T (>~1173 K); (2) further Mg-Al exchange equilibrium studies should be carried out at relatively low T and ambient P, as well as in vast ranges of simultaneous high P and high T; and (3) direct experimental measures about the entropies or the enthalpies of the MgAl2O4-spinels disordered to different extents should be conducted with full characterization of the starting materials and detailed description of the experimental procedures.

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