Effects of indomethacin and cysteamine on the duodenal mucosa of rats were studied microscopically (using scanning electron microscopy) and also functionally. Indomethacin (5 mg/kg, s.c.) induced no microscopic damage to the duodenal epithelium for up to 6 hr after administration. Indomethacin had no effects on gastric H+ output and the amount of H+ in the duodenum, but did reduce the duodenal ...

An evaluation of several potential factors limiting carbon dioxide excretion by rainbow trout (Oncorhynchus mykiss) red blood cells was performed in vitro using a recently developed radioisotopic assay. Red blood cell (RBC) CO2 excretion was reduced by pretreatment (30min) of blood with the carbonic anhydrase inhibitor acetazolamide (final nominal concentration 1024 mol l21) or the Cl/HCO3 exch...

We present results from a field study of inorganic carbon (C) acquisition by Ross Sea phytoplankton during Phaeocystis-dominated early season blooms. Isotope disequilibrium experiments revealed that HCO3 ) was the primary inorganic C source for photosynthesis in all phytoplankton assemblages. From these experiments, we also derived relative enhancement factors for HCO3 ) ⁄CO2 interconversion as...

Rivers are an important aquatic conduit that connects terrestrial sources of dissolved inorganic carbon (DIC) and other elements with oceanic reservoirs. The Mekong River, one of the world's largest rivers, is firstly examined to explore inter-annual fluxes of dissolved and particulate constituents during 1923-2011 and their associated natural or anthropogenic controls. Over this period, inter-...

The multiple indicator dilution technique was used to study transfer of labeled HCO3- across the hepatocyte membrane in the anesthetized mongrel dog. A bolus of H[14C]O3-, 51Cr-labeled erythrocytes, [36Cl-] and/or [3H]sucrose, and [3H]OH was injected through a catheter in the portal vein, and timed anaerobic blood samples were obtained from a catheter in the hepatic vein. Experiments were carri...

This study aims to investigate the quality and vulnerability of surface water (Aries River catchment) in order identify impact past mining activities. For this purpose, pollution indices, Piper Durov plots, as well modeling maps were used. The obtained results indicate that samples contaminated with As, Fe, Mn, Pb have relatively high concentrations SO42−, HCO3−, TDS, Ca, K, Mg values for elect...

In this study, we investigate chemical and isotopic characteristics of low-temperature geothermal waters issuing from carbonate reservoirs in the Çürüksu Graben within eastern termination Büyük Menderes western Turkey. Temperatures pH values vary 20.1 to 24.6 °C 6.62 7.11 those cold are 17.1 19.9 6.85 7.72, respectively. Geothermal Ca-HCO3 Ca-SO4 types whereas characterized by these two Mg-HCO3...

Reduced gastrointestinal HCO3- secretion contributes to malabsorption and obstructive syndromes in cystic fibrosis. The apical HCO3- transport pathways in these organs have not been defined. We therefore assessed the involvement of apical Cl-/HCO3- exchangers and anion conductances in basal and cAMP-stimulated duodenal HCO3- secretion. Muscle-stripped rat and rabbit proximal duodena were mounte...