abstract a previous study on agricultural drains in khuzestan province of iran has indicated that carbonate calcium is the main component of the deposited salts in drainage envelops. to investigate the process of precipitation of carbonate calcium under different conditions including chemical, bio-chemical, aerobic and an-aerobic, a through laboratory investigation on geotextile drain envelop w...

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...

The decrease in elastic moduli (Young's, bulk, and shear modulus), the variations in their asymmetries, the Poisson's ratio and the linear compressibility due to carbonate formation in NaX, have been compared to those produced by dealumination of the zeolite HY framework, from the Al-Si-Al fragment positioned in joined 4R rings. All these systems have been considered at the density functional t...

1. Incorporation of calcium and carbonate into shell has been studied in the scallop Argopecten irradians using 45Ca and 14C-bicarbonate. 2. The incorporation of 45Ca and 14C-carbonate into shell was linear with time after a lag period of 1 to 2 hours. The shell-forming mantle tissue attained a steady state with respect to 45Ca in the sea water medium within 2 hours. 3. The molar ratio of 45Ca ...

Determination of the relationships between soil and plant cover indispensible in the in planning and managementof the arid regions, the aim being to revitalize plant cover, conserve soil and to combat desertification. Among factorsaffecting plant cover, particularly in arid and semiarid areas are soil traits. During the present study, the effect ofHaloxylon aphyllum Cultivation on soil physioch...

[1] Successful geologic sequestration of carbon in deep saline aquifers requires accurate predictive models of rock-brine-CO2 interaction. Often overlooked in siliciclastichosted saline reservoirs is the carbonate buffering of the groundwater. Carbonate minerals are ubiquitous, even in siliciclastic host rocks, resulting in some carbonate buffering. Geochemical modeling of rock-brine-CO2 system...

This study investigates the potential of hydrothermal carbonisation (HTC) for fractionating anaerobic digestate sewage sludge into carbon-rich hydrochar and nutrient-rich aqueous phase (AP). AP is subsequently used to supplement cultures alkali halophilic microalgae D. tertiolecta (CCAP 19/30), convert sodium bicarbonate carbonate solution as part an integrated biogas purification system. HTC a...

The present experiments were designed to localize the sites of carbonic anhydrase-independent bicarbonate reabsorption in the rat kidney and to examine some of its mechanisms. Young Munich-Wistar rats were studied using standard cortical and papillary free-flow micropuncture techniques. Total CO2 (tCO2) was determined using microcalorimetry. In control rats both superficial and juxtamedullary p...

analytical results of 11 groundwater samples are used to evaluate the quality of groundwater in the hastijan area, (central province –iran). the main indices of water, ions physicochemical characteristics and the important heavy metals concentration studied. to estimate of water quality, piper, ghibbs, schoeller and wilcox diagrams, sodium absorption ratio, color-alkalinity and saturation index...