نتایج جستجو برای: caco3
تعداد نتایج: 2615 فیلتر نتایج به سال:
Ocean acidification and decreasing seawater saturation state with respect to calcium carbonate (CaCO3) minerals have raised concerns about the consequences to marine organisms that build CaCO3 structures. A large proportion of benthic marine calcifiers incorporate Mg into their skeletons (Mg-calcite), which, in general, reduces mineral stability. The relative vulnerability of some marine calcif...
Phenol-formaldehyde (PF) resin is one of the most well-known adhesives for exterior use. PF adhesive commercial thermoset polymers that used extensively due to its many benefits. This study investigated influence different types and levels catalysts, i.e., NaOH CaCO3 at 1% 5% based on solids content properties, adhesion, cohesion strength resin. The results show catalyst type significantly infl...
BACKGROUND Oesophageal acid neutralization with antacids depends on the duration of oesophageal antacid exposure and acid neutralizing capacity. A gum that releases antacid as it is chewed could take advantage of both mechanisms to enhance heartburn relief. METHODS Twenty-four subjects were crossed over to four regimens: placebo, chewable antacid tablets (1000 mg CaCO3), lower dose gum (600 m...
The larval spicule matrix protein SM50 is the most abundant occluded matrix protein present in the mineralized larval sea urchin spicule. Recent evidence implicates SM50 in the stabilization of amorphous calcium carbonate (ACC). Here, we investigate the molecular interactions of SM50 and CaCO3 by investigating the function of three major domains of SM50 as small ubiquitin-like modifier (SUMO) f...
Abstraet--A method for the determination of the cations of Na, K, Mg and Ca adsorbed on clay minerals mixed with CaCO3 and MgCO3 is described. An ethanolic solution of LiC1-CsC1 is used to displace the exchangeable cations. Blank determinations performed using either a second ethanolic leach or a second LiC1-CsC1 leach, are used to correct for carbonate dissolution. Details of the methods devel...
Moonmilk is a karstic speleothem mainly composed of fine calcium carbonate crystals (CaCO3) with different textures ranging from pasty to hard, in which the contribution of biotic rock-building processes is presumed to involve indigenous microorganisms. The real microbial input in the genesis of moonmilk is difficult to assess leading to controversial hypotheses explaining the origins and the m...
The effect of polymer, plasticizer, and surfactant additives on stress development during drying of calcium carbonate particulate coatings was studied using a controlled-environment apparatus that simultaneously monitors drying stress, weight loss, and relative humidity. We found that the calcium carbonate coatings display a drying stress evolution typical of granular films, which is characteri...
Basin-scale calcification rates are highly important in assessments of the global oceanic carbon cycle. Traditionally, such estimates were based on rates of sedimentation measured with sediment traps or in deep sea cores. Here we estimated CaCO3 precipitation rates in the surface water of the Red Sea from total alkalinity depletion along their axial flow using the water flux in the straits of B...
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