Medical research

Dental enamel can't regenerate, right? Think again

Dental enamel is tricky stuff. Even though it's the body's hardest material, if it wears away from cavities, acidic food or drinks or overbrushing, it doesn't regenerate.

Ophthalmology

Study finds no evidence that calcium increases risk of AMD

Eating a calcium-rich diet or taking calcium supplements does not appear to increase the risk of age-related macular degeneration (AMD), according to the findings of a study by scientists at the National Eye Institute (NEI). ...

Diseases, Conditions, Syndromes

AAOS: supplement use low in patients with osteoporosis, hip fracture

(HealthDay)—Of patients diagnosed with osteoporosis who have a history of hip fracture, only 14 percent are receiving appropriate calcium and vitamin D supplementation, according to a study presented at the annual meeting ...

Neuroscience

Why you lose hearing for a while after listening to loud sounds

Loud sounds can impair hearing for a short time. Researchers at Linköping University, Sweden, have discovered a mechanism that explains how this happens. Their results are presented in the journal Proceedings of the National ...

Neuroscience

Triangular relationship in the epileptic brain

When an epileptic seizure occurs in the brain, the nerve cells lose their usual pattern and fire in a very fast rhythm. The cause is a complex interplay of various factors. Scientists at the University of Bonn have now discovered ...

Neuroscience

New MRI sensor can image activity deep within the brain

Calcium is a critical signaling molecule for most cells, and it is especially important in neurons. Imaging calcium in brain cells can reveal how neurons communicate with each other; however, current imaging techniques can ...

Genetics

Scientists catch heartbeat 'molecular switch' in action

Oxford University Radcliffe Department of Medicine researchers have developed a new method that uses a protein originally found in marine corals to visualise the flow of calcium that makes the heart beat.

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Calcium

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.

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