News tagged with energy

Related topics: electricity , energy consumption , renewable energy , energy efficiency , fossil fuels

Glucagon, GLP-1 co-infusion can reduce appetite

(HealthDay)—Co-infusion of glucagon and glucagon-like peptide 1 (GLP-1) correlates with a reduction in appetite, and GLP-1 protects against glucagon-induced hyperglycemia in healthy volunteers, according ...

Jun 25, 2014
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Energy drinks raise new questions about caffeine's safety

Caffeine, which was extensively researched for possible links to birth defects in animals and cardiovascular disease in humans over 30 years ago and then exonerated, has become the focus of renewed concerns as caffeine-containing ...

Jun 24, 2014
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Soda war activists look to tobacco as model

Soft drinks should be targeted like tobacco with consumer warning labels that spell out the risk of obesity and other maladies, American advocates of a war on soda say.

Jun 06, 2014
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Team finds on-off switch to burning stored fat

Scientists this week reported that a molecular pathway called mTORC1 controls the conversion of unhealthy white fat into beige fat, an appealing target for increasing energy expenditure and reducing obesity. The team, led ...

Jun 05, 2014
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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.

This text uses material from Wikipedia licensed under CC BY-SA