microgravity


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microgravity

(mÿ-kroh-grav -ă-tee) The very low gravity encountered on spacecraft in Earth orbit, leading to a condition of near weightlessness. The behavior of liquids and gases in microgravity differs markedly from that observed on Earth. Hydrostatic pressure is small, sedimentation is suppressed, and dynamic effects, such as thermal convection, disappear. Space missions dedicated to the study of materials and living matter in microgravity include Eureca, the International Microgravity Laboratory, and the US Microgravity Laboratory.

microgravity

[‚mī·krō′grav·əd·ē]
(mechanics)
A state of very weak gravity, such that the gravitational acceleration experienced by an observer inside the system in question is of the order of one-millionth of that on earth.
References in periodicals archive ?
(13,21,22) The current analysis indicates that microgravity could induce similar alterations in this local wall geometry through changes to the overall shape of the heart.
The research of Mary Kearns-Jonker of Loma Linda University in California and Roland Kaunas of Texas A&M University will gauge the impact of microgravity on fundamental stem cell properties.
Castillo said his team was at the "very start of all of our preliminary research" and the brewers had more work to do on understanding the effects of microgravity on alcohol absorption.
The MIP 1 alpha level was decreased in microgravity which is potential markers of bone loss [20].
Porterfield explains: "We wanted to do more research on this system, but the technology to do dynamic experiments in microgravity was not available.
The first muscles to atrophy in microgravity, Baldwin says, are in the calves, thighs, and back.
Future space exploration and research depends on the ability of humans to survive and operate during and after long-term exposure to a microgravity environment.
The experiment was conducted in the microgravity of orbit because the changes in viscosity that take place in the critical state cannot be measured accurately in Earth's gravity.
The scientific interest of experiments in microgravity in a series of fields (life sciences, material technologies, radiation protection, etc.) is beyond dispute (manned flights are in this respect much more interesting that unmanned flights).
This project will determine whether blood clotting factor homologues are expressed in fiber type-specific muscle exposed to the atrophy of simulated microgravity. During the next several weeks blood clotting factors will be generated as P32 labeled or biotin labeled (non-radioactive) cDNA probes to probe Northern RNA blots containing total RNA extracted from adult male rat skeletal muscle exposed to the atrophy of simulated microgravity.
The Space Shuttle and International Space Station provide a unique microgravity environment for research that is a critical part of the National Aeronautics and Space Administration's (NASA) mission to improve the quality of life on Earth and enable the health and safety of space explorers for long duration missions beyond our solar system.