calcium carbonate

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calcium carbonate,

CaCO3, white chemical compound that is the most common nonsiliceous mineral. It occurs in two crystal forms: calcite, which is hexagonal, and aragonite, which is rhombohedral. Calcium carbonate is largely insoluble in water but is quite soluble in water containing dissolved carbon dioxide, combining with it to form the bicarbonate Ca(HCO3)2. Such reactions on limestonelimestone,
sedimentary rock wholly or in large part composed of calcium carbonate. It is ordinarily white but may be colored by impurities, iron oxide making it brown, yellow, or red and carbon making it blue, black, or gray. The texture varies from coarse to fine.
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 (which is mainly composed of calcite) account for the formation of stalactites and stalagmites in caves. Iceland spar is a pure form of calcium carbonate and exhibits birefringence, or double refractionrefraction,
in physics, deflection of a wave on passing obliquely from one transparent medium into a second medium in which its speed is different, as the passage of a light ray from air into glass.
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Calcium Carbonate


CaCO3, a salt.

Calcium carbonate occurs in nature in two mineral forms with differing crystalline structures: aragonite and the widely distributed calcite. Calcium carbonate decomposes when heated above 900°C: CaCO3 = CaO + CO2 (a means of obtaining lime). It is sparingly soluble in water (14 mg calcite per liter at 18°C) and readily soluble in acids. Natural calcium carbonate (limestone, marble) is used as a construction material; chalk (powdered calcium carbonate) serves as a filler for rubber stock, paper, and linoleum. A softer and finer product, called precipitated calcium carbonate (obtained through the reaction of CaCl2 and Na2CO3), is used in the manufacture of tooth powderand cosmetics.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

calcium carbonate

[′kal·sē·əm ′kär·bə‚nāt]
(inorganic chemistry)
CaCO3 White rhombohedrons or a white powder; occurs naturally as calcite; used in paint manufacture, as a dentifrice, as an anticaking medium for table salt, and in manufacture of rubber tires.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

calcium carbonate

A low-density white pigment for use in paint; provides little opacity; used mainly to provide bulk and flatness.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

calcium carbonate

a white crystalline salt occurring in limestone, chalk, marble, calcite, coral, and pearl: used in the production of lime and cement. Formula: CaCO3
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
H292 or Caco2 cells were seeded at a density of 2 x [10.sup.4] cells in a 96-well plate for 72 h.
The results show that in Caco2 cell lines not treated and observed to microscopy imnumofluorescencia show that KLF6 is apparently expressed a strong expression in the nucleus (Fig.
The PC3 prostate and the Caco2 colon cell lines were the most affected, while the growth of the mammary MCF-7 and the hepatic HepG2 cell lines was diminished at a lesser extent.
Zhi, "Somatostatin ameliorates lipopolysaccharide-induced tight junction damage via the ERK-MAPK pathway in Caco2 cells," European Journal of Cell Biology, vol.
Colorectal cell lines HT29/219, LS180, SW742, Caco2, HTC116, SW48, SW480, and SW1116 were shown by real-time PCR to have expressed UBE2Q2 mRNA (figure 1A).
Biodisponibility of the lycopene encapsulated in gelatin was evaluated in vitro using Caco2 cells cultured on transfilter (Millicell, Millipore Corporation) and assessment of the transport of lycopene through the epithelial cells monolayer by spectrophotometric measurement of lycopene in the basal compartment.
Dinicola et al showed that GSE has anti-proliferative and apoptotic effects on CaCO2 and HCT-8 colon cancer cell lines [25].
In addition, Dinicola et al., (2012) reported that HCT-8 colon cancer cells are differently sensitive to the anticancer effects triggered by GSE than Caco2 colon cancer cells.
The results indicate that Fe of Fe-Gly can be easily absorbed than FeSO4 in Caco2 cells.
The goal of the present study was to determine if the pretreatment with DTNQ-Pro can modulate the cytotoxic response of Caco2 cells to fluorouracil (5-FU) and assess the potential mechanisms underlying such modulation.
Besides, the addition of strains LGG and Lcr35 also resulted in a similar TJ morphology as original in the Caco2 monolayer.