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...

The study of electrochemical reactions in seawater requires understanding the associated coupled chemistry with components seawater, especially role carbonate–bicarbonate buffer system case proton-coupled electron transfer reactions. We report comparative paradigmatic voltammetric response reversible hydrogen oxidation reaction absence or presence dibasic phosphate, formate, bicarbonate. Electr...

PURPOSE Since saliva protects the oesophageal and oral mucosa against hydrogen ions, the aim of the study was to establish the relationship between the secretion of gastric acid and salivary bicarbonate. MATERIAL AND METHODS The study involved 43 Helicobacter pylori positive duodenal ulcer patients receiving: 1. omeprazole alone (O), 2. omeprazole and amoxicillin (OA) or 3. omeprazole, amoxic...

Bicarbonate secretion in the intestine (duodenum) of marine fish has been suggested to play a major role in regulation of calcium availability for uptake. However, while the end process may lead to carbonate precipitation, regulation of transport of calcium and/or bicarbonate may actually result in fine-tuning of calcium availability for transport. To test this hypothesis, sea bream (Sparus aur...

In 1924 Warburg and coworkers (1) reported that variation in both the pH and the bicarbonate concentration of the medium affected the anaerobic glycolysis of Flexner-Jobling rat carcinoma in vitro. When the bicarbonate level was held constant, an increase in COz tension was accompanied by a fall in the rate of anaerobic glycolysis. At a constant pH, increasing the bicarbonate concentration from...

BACKGROUND In a previous study we demonstrated that mild metabolic alkalosis resulting from standard bicarbonate haemodialysis induces hypotension. In this study, we have further investigated the changes in systemic haemodynamics induced by bicarbonate and calcium, using non-invasive procedures. METHODS In a randomized controlled trial with a single-blind, crossover design, we sequentially ch...

Z. Naturforsch. 4 8c , 251 2 5 8 (1993); received October 27, 1992 Bicarbonate Effect, Chloroacetates, Chlorophyll a Fluorescence, D 1 and D 2 Mutants, Herbicides In this paper the current status of the so-called bicarbonate effect is presented. Several chem­ icals (such as formate, azide, nitrite and nitric oxide) are known to inhibit the two-electron gate of photosystem II (PS II). A remerkab...