Researchers from Tokyo Metropolitan University have shown that skeletal muscle satellite cells, key players in muscle repair, proliferate better in low glucose environments. This is contrary to conventional wisdom that says ...
Apr 5, 2021
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A surge in hospital visits and internet searches related to COVID-19 symptoms from the Chinese city of Wuhan suggests the coronavirus may have been circulating since August 2019, according to a preliminary study by researchers ...
Jun 10, 2020
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Muscular function declines with age. A new study by researchers at Karolinska Institutet in Sweden shows how an unexpectedly high number of mutations in the stem cells of muscles impair cell regeneration. This discovery may ...
Feb 26, 2018
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Many Americans still struggle to get their daily steps in, despite the physical and emotional benefits of walking as part of a healthy lifestyle. Where a person spends their day, however, can influence the likelihood that ...
Jun 16, 2022
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Blue light has become an increasingly common component of urban outdoor lighting. But how does it impact our health? A team led by the Barcelona Institute for Global Health (ISGlobal), a center supported by the "la Caixa" ...
Jul 30, 2020
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When a muscle is damaged, dormant adult stem cells called satellite cells are signaled to "wake up" and contribute to repairing the muscle. University of Missouri researchers recently found how even distant satellite cells ...
Dec 1, 2011
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A team of researchers affiliated with multiple institutions in Belgium has found that children who grow up in areas with little greenery are at risk of scoring lower on IQ tests. In their paper posted on the open access site ...
Children who grow up with greener surroundings have up to 55% less risk of developing various mental disorders later in life. This is shown by a new study from Aarhus University, Denmark, emphasizing the need for designing ...
Feb 25, 2019
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Working with mice, Johns Hopkins researchers have solved a key part of a muscle regeneration mystery plaguing scientists for years, adding strong support to the theory that muscle mass can be built without a complete, fully ...
Sep 27, 2012
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A research collaboration between Kumamoto University and Nagasaki University in Japan has found that components leaking from broken muscle fibers activate "satellite" muscle stem cells. While attempting to identify the proteins ...
Oct 13, 2020
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In the context of spaceflight, a satellite is an object which has been placed into orbit by human endeavor. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as the Moon.
The first artificial satellite, Sputnik 1, was launched by the Soviet Union in 1957. By 2009 thousands of satellites have been launched into orbit around the Earth. These originate from more than 50 countries and have used the satellite launching capabilities of ten nations. A few hundred satellites are currently operational, whereas thousands of unused satellites and satellite fragments orbit the Earth as space debris. A few space probes have been placed into orbit around other bodies and become artificial satellites to the Moon, Venus, Mars, Jupiter and Saturn.
Satellites are used for a large number of purposes. Common types include military (spy) and civilian Earth observation satellites, communication satellites, navigation satellites, weather satellites, and research satellites. Space stations and human spacecraft in orbit are also satellites. Satellite orbits vary greatly, depending on the purpose of the satellite, and are classified in a number of ways. Well-known (overlapping) classes include low Earth orbit, polar orbit, and geostationary orbit.
Satellites are usually semi-independent computer controlled systems. Satellite subsystems attend many tasks, such as power generation, thermal control, telemetry, attitude control and orbit control.
This text uses material from Wikipedia, licensed under CC BY-SA
