Medical research

Growth hormone acts to prevent weight loss

Researchers at the University of São Paulo (USP) in Brazil have discovered that growth hormone (GH), which stimulates skeletal maturation and linear bone growth, as well as helping maintain tissue and organs throughout life, ...

Health

Vitamin C can shorten the length of stay in the ICU

Vitamin C administration shortened the length of stay in the intensive care unit on average by 8 percent in 12 trials with 1766 patients according to a meta-analysis published in Nutrients.

Health

Major medical groups call for soda taxes

(HealthDay)—Two medical groups have declared war on sodas and energy drinks by calling for taxes on what has become the leading source of sugar in the diets of children and teens.

Health

Zambia bans 'Viagra' energy drink

Authorities in Zambia have banned an energy drink after laboratory results showed that it contained the active ingredient of the anti-impotence drug Viagra.

Cardiology

Sleep, heart disease link leads from brain to bone marrow

Researchers have known for some time that poor sleep raises heart disease risk. Now, they've found a chemical chain reaction that helps explain that risk, leading from poor sleep to a white blood cell surge that promotes ...

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Energy

In physics, energy (from the Greek ἐνέργεια - energeia, "activity, operation", from ἐνεργός - energos, "active, working") is a scalar physical quantity that describes the amount of work that can be performed by a force, an attribute of objects and systems that is subject to a conservation law. Different forms of energy include kinetic, potential, thermal, gravitational, sound, light, elastic, and electromagnetic energy. The forms of energy are often named after a related force.

Any form of energy can be transformed into another form, but the total energy always remains the same. This principle, the conservation of energy, was first postulated in the early 19th century, and applies to any isolated system. According to Noether's theorem, the conservation of energy is a consequence of the fact that the laws of physics do not change over time.

Although the total energy of a system does not change with time, its value may depend on the frame of reference. For example, a seated passenger in a moving airplane has zero kinetic energy relative to the airplane, but non-zero kinetic energy relative to the Earth.

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