• forms
  • The effects of temperature, time and humidity were investigated to determine their influence on the kinetics of dehydration/hydration of different hydration forms of calcium sulfate. (wku.edu)
  • ions
  • Calcium ions outside cells are important for maintaining the potential difference across excitable cell membranes as well as proper bone formation. (wikipedia.org)
  • All waters in contact with the atmosphere absorb carbon dioxide, and as these waters come into contact with rocks and sediments they acquire metal ions, most commonly calcium and magnesium , so most natural waters that come from streams, lakes, and especially wells, can be regarded as dilute solutions of these bicarbonates. (wikipedia.org)
  • The reactor dissolves the calcium-laden media to provide bicarbonates HCO 3 − (alkalinity) and calcium (Ca ++ ) ions at the sames rate as consumed during calcification. (wikipedia.org)
  • As a soluble source of calcium ions, this chemical is also used as a first-aid treatment for exposure to hydrofluoric acid . (wikipedia.org)
  • Many enzymes require calcium ions as a cofactor. (wikipedia.org)
  • Calcium silicate neutralizes active acidity in AMD systems by removing free hydrogen ions from the bulk solution, thereby increasing pH. (wikipedia.org)
  • The solubility of calcium L-lactate in water increases significantly in presence of d-gluconate ions, from 6.7 g/dl) at 25 °C to 9.74 g/dl or more. (wikipedia.org)
  • Paradoxically, while the solubility of calcium L-lactate increases with temperature from 10 °C (4.8 g/dl) to 30 °C (8.5 g/dl), the concentration of free Ca2+ ions decreases by almost one half. (wikipedia.org)
  • chloride
  • Crystals of the tetrahydrate can be prepared by reacting sodium pyrophosphate, Na4P2O7 with calcium nitrate, Ca(NO3)2, at carefully controlled pH and temperature: Na4P2O7(aq) +2 Ca(NO3)2(aq) → Ca2P2O7·4 H2O + 2 Na2NO3 The dihydrate, sometimes termed CPPD, can be formed by the reaction of pyrophosphoric acid with calcium chloride: CaCl2 + H4P2O7(aq) → Ca2P2O7·2 H2O + HCl. (wikipedia.org)
  • Calcium arsenate is commonly prepared from disodium hydrogen arsenate and calcium chloride: 2 Na2H[AsO+ 3 CaCl2 → 4 NaCl + Ca3[AsO + 2 HCl In the 1920s, it was made in large vats by mixing calcium oxide and arsenic oxide. (wikipedia.org)
  • Scrubbing with limestone follows the following idealized reaction: SO2 + CaCO3 → CaSO3 + CO2 Scrubbing with hydrated lime follows the following idealized reaction: SO2 + Ca(OH)2 → CaSO3 + H2O In the laboratory calcium sulfite can be produced by reaction of aqueous solutions of calcium chloride and sodium sulfite. (wikipedia.org)
  • The compound is also added to fresh-cut fruits, such as cantaloupes, to keep them firm and extend their shelf life, without the bitter taste caused by calcium chloride, which can also be used for this purpose. (wikipedia.org)
  • Calcium lactate has been considered as a coagulant for removing suspended solids from water, as a renewable, non-toxic, and biodegradable alternative to aluminum chloride AlCl 3. (wikipedia.org)
  • citation needed
  • Calcium borate (Ca3(BO3)2), also called Gerstley borate[citation needed], is a bluish white crystal with a very defined structure. (wikipedia.org)
  • citation needed] While the best possible reaction to fire classifications are A1 (construction applications) and A1Fl (flooring applications) respectively, both of which mean "non-combustible" according to EN 13501-1: 2007, as classified by a notified laboratory in Europe, some calcium-silicate boards only come with fire classification of A2 (limited combustibility) or even lower classifications (or no classification), if they are tested at all. (wikipedia.org)
  • citation needed] Calcium lactate is also used to treat hypocalcaemia (calcium deficiencies). (wikipedia.org)
  • reaction
  • Inside the reaction chamber, a calcium rich media ( aragonite ), mainly CaCO 3 , is forced into contact with water injected with carbon dioxide (CO 2 ) in order to create carbonic acid (H 2 CO 3 ). (wikipedia.org)
  • It may be formed by reaction of the elements, but it is more commonly prepared by carbothermal reduction of calcium phosphate: Ca3(PO4)2 + 8 C → Ca3P2 + 8 CO The structure of the room temperature form of Ca3P2 has not been confirmed by X-ray crystallography. (wikipedia.org)
  • When strongly heated in air, calcium bromide will react with oxygen to produce calcium oxide and bromine: 2 CaBr2 + O2 → 2 CaO + 2 Br2 In this reaction the oxygen oxidizes the bromide to bromine. (wikipedia.org)
  • Hydride
  • Calcium hydride is the chemical compound with the formula CaH2, and is therefore an alkaline earth hydride. (wikipedia.org)
  • Calcium hydride is prepared from its elements by direct combination of calcium and hydrogen at 300 to 400 °C. CaH2 is a reducing agent for the production of metal powders from the oxides of Ti, V, Nb, Ta, and U. It is proposed to operate via its decomposition to Ca metal: TiO2 + 2 CaH2 → Ti + 2 CaO + 2 H2 CaH2 has been used for hydrogen production. (wikipedia.org)
  • Calcium hydride is a relatively mild desiccant and, compared to molecular sieves, probably inefficient. (wikipedia.org)
  • Calcium hydride is widely used as a desiccant for basic solvents such as amines and pyridine. (wikipedia.org)
  • During the Battle of the Atlantic, German submarines used calcium hydride as a sonar decoy called bold. (wikipedia.org)
  • Calcium monohydride can be formed by exposing metallic calcium to an electric discharge in a hydrogen atmosphere above 750 °C. Below this temperature the hydrogen is absorbed to form calcium hydride. (wikipedia.org)
  • Cell Calcium
  • Cell Calcium is critical and highly regulated by the cells. (medicalnewstoday.com)
  • Cell Calcium is a monthly peer-reviewed scientific journal published by Elsevier that covers the field of cell biology and focuses mainly on calcium signalling and metabolism in living organisms. (wikipedia.org)
  • The journal is abstracted and indexed in: BIOSIS Cambridge Scientific Abstracts Current Awareness in Biological Sciences Current Contents/Life Sciences EMBASE MEDLINE/PubMed Science Citation Index Scopus According to the Journal Citation Reports, Cell Calcium has a 2012 impact factor of 4.327. (wikipedia.org)
  • lime
  • It is a colorless crystal or white powder and is obtained when calcium oxide (called lime or quicklime ) is mixed, or slaked with water . (wikipedia.org)
  • Calcium iodate can be produced by the anodic oxidation of calcium iodide or by passing chlorine into a hot solution of lime in which iodine has been dissolved. (wikipedia.org)
  • CaCl2
  • CaCl2 + Na2SO3 → CaSO3 + 2 NaCl The structure of calcium sulfite has been examined by X-ray crystallography. (wikipedia.org)
  • limestone
  • As opposed to limestone (a popular remediation material), calcium silicate effectively precipitates heavy metals and does not armor over, prolonging its effectiveness in AMD systems. (wikipedia.org)
  • sulfate
  • Calcium sulfate causes permanent hardness in water. (wikipedia.org)
  • The main use of calcium sulfate is to produce plaster of Paris and stucco . (wikipedia.org)
  • These applications exploit the fact that calcium sulfate which has been powdered and calcined forms a moldable paste upon hydration and hardens as crystalline calcium sulfate dihydrate. (wikipedia.org)
  • The impure acid from various sources was converted to calcium lactate, purified by crystallization, and then converted back to acid by treatment with sulfuric acid, which precipitated the calcium as calcium sulfate. (wikipedia.org)
  • carbide
  • During the 1920s and 1930s, Charles Kingsford Smith used separate buoyant canisters of calcium carbide and calcium phosphide as naval flares lasting up to ten minutes. (wikipedia.org)
  • Calcium phosphide is a common impurity in calcium carbide , which may cause the resulting phosphine-contaminated acetylene to ignite spontaneously. (wikipedia.org)
  • It may also be prepared by reacting liquid hydrocyanic acid with calcium carbide. (wikipedia.org)
  • salts
  • Hypothetical univalent salts of calcium would be stable with respect to their elements, but not to disproportionation to the divalent salts and calcium metal, because the enthalpy of formation of MX 2 is much higher than those of the hypothetical MX. (wikipedia.org)
  • intracellular
  • The PMCA and the sodium calcium exchanger (NCX) are together the main regulators of intracellular Ca2+ concentrations. (wikipedia.org)
  • Calcium pumps play a crucial role in proper cell signalling by keeping the intracellular calcium concentration roughly 10,000 times lower than the extracellular concentration. (wikipedia.org)
  • atoms
  • The Ca2+ centers have high coordination numbers, being bonded to the sulfite oxygen atoms and the water, giving calcium a coordination number of eight. (wikipedia.org)
  • It can be found in stars as a gas formed when calcium atoms are present with hydrogen atoms. (wikipedia.org)
  • absorption
  • Interest in this area has led to examination of the effects of PPIs on calcium absorption/metabolism and numerous cohort, case-control, and prospective studies of their ability to affect bone density and cause bone fractures. (springer.com)
  • Vitamin D is essential for calcium absorption, so it's important to get enough of this nutrient too. (kidshealth.org)
  • enough calcium
  • Children who get enough calcium start their adult lives with the strongest bones possible. (kidshealth.org)
  • How Can I Help My Child Get Enough Calcium? (kidshealth.org)
  • Kids who can't eat dairy may not get enough calcium. (kidshealth.org)
  • Bones grow rapidly during adolescence, and teens need enough calcium to build strong bones and fight bone loss later in life. (kidshealth.org)
  • If people aren't getting enough calcium in their diet, the body takes calcium from the bones to ensure normal cell function, which can lead to weakened bones. (kidshealth.org)
  • If you got enough calcium and physical activity when you were a kid and continue to do so as a teen, you'll enter your adult years with the strongest bones possible. (kidshealth.org)
  • form
  • Calcium cyanide hydrolyzes readily to form hydrogen cyanide gas. (wikipedia.org)
  • The high temperature form α- is monoclinic, with 8 coordinate calcium, the lower temperature form β- is tetragonal, with calcium in four different coordination environments, 2 that are 7 coordinate, one eight and one 9. (wikipedia.org)
  • The lactate ion is chiral, with two enantiomers, D (−,R) and L (+,S). The L isomer is the one normally synthesized and metabolized by living organisms, but some bacteria can produce the D form or convert the L to D. Thus calcium lactate also has D and L isomers, where all anions are of the same type. (wikipedia.org)
  • reactive
  • In bulk, calcium is less reactive: it quickly forms a hydration coating in moist air, but below 30% relative humidity it may be stored indefinitely at room temperature. (wikipedia.org)
  • broccoli
  • You'll also find calcium in broccoli and dark green, leafy vegetables (especially collard and turnip greens, kale, and bok choy). (kidshealth.org)
  • acid
  • In medicine, calcium bicarbonate is sometimes administered intravenously to immediately correct the cardiac depressor effects of hypokalemia by increasing calcium concentration in serum, and at the same time, correcting the acid usually present. (wikipedia.org)
  • Alternatively calcium cyanide may be prepared by reacting hydrocyanic acid gas with quicklime (CaO) at high temperatures around 400 °C. At higher temperatures around 600 °C calcium cyanimide is formed instead. (wikipedia.org)
  • It can be prepared by reacting calcium metal with boric acid. (wikipedia.org)
  • When this material is processed into a highly refined, re-purposed calcium silicate aggregate, it is used in the remediation of acid mine drainage (AMD) on active and passive mine sites. (wikipedia.org)
  • Calcium lactate is an ingredient in some baking powders containing sodium acid pyrophosphate. (wikipedia.org)
  • alloy
  • still, in small quantities it is often used as an alloying component in steelmaking, and sometimes, as a calcium-lead alloy, in making automotive batteries. (wikipedia.org)
  • milk
  • Make smoothies with fresh fruit and low-fat milk or calcium-fortified soy or almond milk. (kidshealth.org)
  • If your child has lactose intolerance , a milk allergy , or eats a vegan diet, talk to your health care provider about calcium and vitamin D. (kidshealth.org)
  • Calcium caseinate is a protein produced from casein in skim and sometimes 1% milk. (wikipedia.org)
  • In the early 20th century, oral administration of calcium lactate dissolved in water (but not in milk or tablets) was found to be effective in prevention of tetany in humans and dogs with parathyroid insufficiency or who underwent parathyroidectomy. (wikipedia.org)
  • concentration
  • Since it transports Ca2+ into the extracellular space, the PMCA is also an important regulator of the calcium concentration in the extracellular space. (wikipedia.org)
  • membrane
  • Calcium pumps are a family of ion transporters found in the cell membrane of all animal cells. (wikipedia.org)
  • They are responsible for the active transport of calcium out of the cell for the maintenance of the steep Ca2+ electrochemical gradient across the cell membrane. (wikipedia.org)
  • Molecular
  • Calcium monohydride is the first molecular gas that was cooled by a cold buffer gas and then trapped by a magnetic field. (wikipedia.org)