نتایج جستجو برای: carbonate and bicarbonate
تعداد نتایج: 16832813 فیلتر نتایج به سال:
Removal of carbon through the precipitation and burial of calcium carbonate in marine sediments constitutes over 70% of the total carbon on Earth and is partitioned between coastal and pelagic zones. The precipitation of authigenic calcium carbonate in seawater, however, has been hotly debated because despite being in a supersaturated state, there is an absence of persistent precipitation. One ...
The molecular diffusion coefficients of dissolved carbon dioxide ðCO2Þ, bicarbonate ion ðHCO 3 Þ, and carbonate ion ðCO 3 Þ are fundamental physico-chemical constants and are of practical significance in various disciplines including geochemistry, biology, and medicine. Yet, very little experimental data is available, for instance, on the bicarbonate and carbonate ion diffusion coefficient. Fur...
SMMSS, K. Calcium and carbonate metabolism in the frcg (Rana temporia) during respiratory acidosis. Am. J. Physiol. 2 14(3) : 627634. 1968.-Frogs (R. temporaria) contain large deposits of calcium carbonate in the endolymphatic sacs of the inner ear. Methods are described for determining the quantities of calcium and phosphate lost from frogs made acidotic with carbon dioxide (5-200/o in oxygen)...
Stability relations of malachite and azurite are calculated and shown in Eh-pH diagrams, using AF (Gibbs free energy) values listed in Garrels and Christ (1965). The malachite/azurite transition is very sensitive to small chemical changes in the environment: equilibrium is reached at Pco2 = 10-a4s atm., i.e. close to normal values, whereas the precipitation of both minerals from cupric-ion-bear...
In situ microbial reduction of soluble U(VI) to sparingly soluble U(IV) was evaluated at the site of the former S-3 Ponds in Area 3 of the U.S. Department of Energy Natural and Accelerated Bioremediation Research Field Research Center, Oak Ridge, TN. After establishing conditions favorable for bioremediation (Wu, et al. Environ. Sci. Technol. 2006, 40, 3988-3995), intermittent additions of etha...
2/3 of the reservoir surface area was approximately covered with dense populations of Myriophyllum, Ceratophyllum and Potamogeton species. The headwaters of the reservoir were considered as hard water and had both carbonatic and non-carbonatic hardness. When they were exposed to lentic condition of the reservoir and its intensive photosynthetic activities of macrophyte communities, the bicarbon...
10.2217/14750708.5.4.545 © 2 Sevelamer carbonate appears to be a promising new agent in the control of serum phosphorus levels in subjects with chronic kidney disease. It contains the same active moiety as sevelamer hydrochloride, but has carbonate instead of chloride as the counterion. This substitution has resulted in a statistically significant improvement in serum bicarbonate levels in chro...
Bicarbonate and calcium set bounds on photosynthesis degradation processes in calcareous freshwaters. Charophytic algae use bicarbonate photosynthesis, direct variable proportions to assimilate organic carbon precipitate carbonate their surfaces. To evaluate pools of (Corg), (Ccarbonate), phosphorus (P) dense charophyte vegetation, we studied apical basal tissue surface precipitates, as well un...
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