Studies on Ion-Exchange Equilibria for Cesium-Hydrogen System

Gadolinium-hydrogen Ion Exchange on Zirconium Phosphate

Hydrogen ion equilibria in fish haemoglobins.

H+ titration studies on oxygenated and deoxygenated haemoglobins from carp, rainbow trout, spiny dogfish and pig are reported, and compared with Hb-H+ equilibria in other species and structural information deduced from amino acid sequences. The buffer values of oxygenated and deoxygenated teleost haemoglobins are low in comparison with elasmobranch and mammalian haemoglobins. This correlates wi...

HYDROGEN EXCHANGE STUDIES OF sRNA.

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Hydrogen Exchange Equilibria in Glutathione Radicals: Rate Constants

The reduction of oxidized glutathione GSSG by hydrated electrons and hydrogen atoms to form GSSG•⁻ is quantitative. The radical anion dissociates into GS• and GS⁻, and the S-centered radical subsequently abstracts a hydrogen intramolecularly. We observe sequential development of UV absorbance signatures that indicate the formation of both α- and β-carbon-centered radicals. From experiments perf...

Ion-exchange, an Approach to Prepare an Oral Floating Drug Delivery System for Diclofenac

Using ion-exchange resins, a multiple-unit type of oral floating dosage system has been prepared to prolong gastric emptying time of dosage form. The system is composed of beads of drug-resin complex, which are loaded with bicarbonate ions and coated with a hydrophobic polymer. The system is so designed that when the beads reach the stomach, chloride ions are exchanged with bicarbonate and drug...