Radiology & Imaging

Tracer molecule may improve imaging tests for brain injury

Researchers have validated a new radiolabeled molecule that can be used with imaging tests to accurately detect and characterize brain injury. The team, led by investigators at Massachusetts General Hospital (MGH), recently ...

Neuroscience

New drug reduces stroke damage in mice

Neuroscientists at the University of Pittsburgh Brain Institute have identified a novel drug that could protect the brain during and after a stroke.

Cardiology

An atomic view of the trigger for the heartbeat

Atomic-level studies of the architecture of tiny sodium channel proteins, critical to generating electrical signals that start off each beat of the heart, are imparting striking details about their function, malfunctions, ...

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Potassium

Potassium (pronounced /pɵˈtæsiəm/) is the chemical element with the symbol K (Latin: kalium, from Arabic: القَلْيَه‎ al-qalyah “plant ashes”, cf. Alkali from the same root), atomic number 19, and atomic mass 39.0983. Potassium was first isolated from potash. Elemental potassium is a soft silvery-white metallic alkali metal that oxidizes rapidly in air and is very reactive with water, generating sufficient heat to ignite the evolved hydrogen.

Potassium in nature occurs only as ionic salt. As such, it is found dissolved in seawater, and as part of many minerals. Potassium ion is necessary for the function of all living cells, and is thus present in all plant and animal tissues. It is found in especially high concentrations in plant cells, and in a mixed diet, it is most highly concentrated in fruits.

In many respects, potassium and sodium are chemically similar, although they have very different functions in organisms in general, and in animal cells in particular.

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