Calcium

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Calcium (pronounced /ˈkælsiəm/) is the chemical element with the symbol Ca and atomic number 20. It has an atomic mass of 40.078 amu. Calcium is a soft grey alkaline earth metal, and is the fifth most abundant element by mass in the Earth's crust. Calcium is also the fifth most abundant dissolved ion in seawater by both molarity and mass, after sodium, chloride, magnesium, and sulfate.

Calcium is essential for living organisms, particularly in cell physiology, where movement of the calcium ion Ca2+ into and out of the cytoplasm functions as a signal for many cellular processes. As a major material used in mineralization of bones and shells, calcium is the most abundant metal by mass in many animals.

For more information about Calcium, read the full article at Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.


News tagged with calcium

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Study Finds Treatment With Anabolic Hormone May Enhance Local Bone Regeneration

Study Finds Treatment With Anabolic Hormone May Enhance Local Bone Regeneration

Medicine & Health / Research

created Dec 22, 2009 | popularity not rated yet | comments 0

(PhysOrg.com) -- In research that could open new avenues of investigation in the prevention and treatment of fractures, in bone regeneration and tissue engineering, scientists from Yale School of Medicine ...


Study identifies women at higher risk of significant bone loss on injectable birth control

Medicine & Health / Health

created Dec 21, 2009 | popularity not rated yet | comments 0

Nearly half of women using depot medroxyprogesterone acetate (DMPA), commonly known as the birth control shot, will experience high bone mineral density (BMD) loss in the hip or lower spine within two years of beginning the ...


Dental delight! Tooth of sea urchin shows formation of biominerals

Dental delight! Tooth of sea urchin shows formation of biominerals

Chemistry / Materials Science

created Dec 21, 2009 | popularity 5 / 5 (4) | comments 0

(PhysOrg.com) -- Some of the most common minerals in biology, including those in bones and shells, have a mysterious structure: Their crystals are positioned in the same orientation, making them behave as ...


Watching Proteins Direct Crystal Growth One Step at a Time (w/ Video)

Watching Proteins Direct Crystal Growth One Step at a Time (w/ Video)

Nanotechnology / Nanophysics

created Dec 16, 2009 | popularity 5 / 5 (3) | comments 0

(PhysOrg.com) -- Scientists at Berkeley Lab's Molecular Foundry imaged the growth of protein-studded mineral surfaces with unprecedented resolution and provided a glimpse into how living systems engineer key ...


Nature's fine designs: Scientists find modern lessons in ancient creations

Nature's fine designs: Scientists find modern lessons in ancient creations

Biology / Other

created Dec 04, 2009 | popularity 4.5 / 5 (4) | comments 0

(PhysOrg.com) -- Nature and its bottom-up processes for creating robust and responsive materials are inspiring new generations of synthetic materials and creative design.


Acid test: Study reveals both losers and winners of CO2-induced ocean acidification

Acid test: Study reveals both losers and winners of CO2-induced ocean acidification

Space & Earth / Earth Sciences

created Dec 01, 2009 | popularity 4.3 / 5 (13) | comments 8

(PhysOrg.com) -- As the world’s seawater becomes more acidic due to rising atmospheric carbon dioxide, some shelled marine creatures may actually become bigger and stronger, according to a new study.


All decked out: Networks of chitin filaments are integral components of diatom silica shells

Chemistry / Biochemistry

created Dec 01, 2009 | popularity 5 / 5 (1) | comments 0

(PhysOrg.com) -- A whole microcosm of various bizarrely shaped life forms opens up when you look at diatoms, the primary component of ocean plankton, under a microscope. The regularly structured silica shells of these tiny ...


A RANK insider resolving the enigma of the fever chart

Medicine & Health / Research

created Nov 25, 2009 | popularity not rated yet | comments 0

Mammals have evolved a complex system for controlling bone remodeling. Babies require calcium for healthy bones and they obtain it from their mother's milk. Nursing mothers release calcium from their bones. Surprisingly, ...


Spotting evidence of directed percolation

Spotting evidence of directed percolation

Physics / General Physics

created Nov 17, 2009 | popularity 3.5 / 5 (2) | comments 0

A team of physicists has, for the first time, seen convincing experimental evidence for directed percolation, a phenomenon that turns up in computer models of the ways diseases spread through a population ...


New study links vitamin D deficiency to cardiovascular disease and death

Medicine & Health / Health

created Nov 16, 2009 | popularity 4.8 / 5 (6) | comments 3

While mothers have known that feeding their kids milk builds strong bones, a new study by researchers at the Heart Institute at Intermountain Medical Center in Salt Lake City suggests that Vitamin D contributes to a strong ...


Drinking green tea helps prevent kidney stones

Drinking green tea helps prevent kidney stones

Chemistry / Other

created Nov 13, 2009 | popularity 5 / 5 (1) | comments 0

(PhysOrg.com) -- Drinking green tea can help prevent the formation of large kidney stones, report Chinese scientists in the Royal Society of Chemistry journal CrystEngComm.


Research reveals lipids' unexpected role in triggering death of brain cells

Medicine & Health / Research

created Nov 12, 2009 | popularity 4 / 5 (1) | comments 0

The lipid that accumulates in brain cells of individuals with an inherited enzyme disorder also drives the cell death that is a hallmark of the disease, according to new research led by St. Jude Children's Research Hospital ...


Commentary warns of unexpected consequences of proton pump inhibitor use in reflux disease

Medicine & Health / Diseases

created Nov 03, 2009 | popularity not rated yet | comments 0

Despite being highly effective and beneficial for many patients, unexpected consequences are emerging in patients who are prescribed proton pump inhibitors (PPIs) for reflux diseases. Physicians are warned to monitor these ...


Epilepsy drugs could treat Alzheimer's and Parkinson's

Medicine & Health / Neuroscience

created Oct 27, 2009 | popularity 4.5 / 5 (2) | comments 0

Researchers in the USA have discovered a potential new function for anti-epileptic drugs in treating neurodegenerative disorders such as Alzheimer's and Parkinson's disease. The study, published in BioMed Central's open access ...


Ocean acidification may contribute to global shellfish decline

Ocean acidification may contribute to global shellfish decline

Space & Earth / Earth Sciences

created Oct 26, 2009 | popularity 2.7 / 5 (7) | comments 2

Relatively minor increases in ocean acidity brought about by high levels of carbon dioxide have significant detrimental effects on the growth, development, and survival of hard clams, bay scallops, and Eastern ...