weightlessness

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weight·less·ness

(wāt'les-nĕs),
The psychophysiologic effect of zero gravity, as experienced by someone falling freely in a vacuum (for example, astronauts in a stable orbit). A temporary state of simulated weightlessness can be achieved during powered flight within the earth's atmosphere by traversing an inverted parabolic curve where gravitational pull and centrifugal force cancel each other out.

weightlessness

Etymology: AS, gewiht + ME, les
a state of absence of apparent weight, as in being beyond the effects of gravitational force in space travel. See also space medicine.
A state in which there is no gravitational effect on a body or material
Physiologic effects Bone mineral loss, altered blood chemistries, weakened immune system, variable heart rate, arrhythmias, loss of skeletal and cardiac muscle mass and strength, increased urinary loss of nitrogen and phosphorus, motion sickness, and redistribution of fluids that are normally pooled in the lower torso and legs, resulting in a ‘fat face’

weightlessness

in horses induces osteoporosis if the period of weightlessness is long enough; in dogs the effects of weightlessness are confused with those of head-out immersion in water.
References in periodicals archive ?
The ability to cultivate adult stem cells in a micro-gravity environment here on earth could prove to be a great leap forward in the field of biotechnology, and we're very interested in discussing how we might be able to assist in the development and marketing of new therapies and other uses for this device.
The flight profiles we flew in November were designed to give us repeated acclimatization to 5-6 Gs during ascent profiles like those we'll experience in suborbital launches, and each zoomed ascent in the F-104 was topped with a zero-G parabola to simulate the transition from hyper-Gs to micro-gravity," says Principal Investigator Stern, associate vice president in the SwRI Space Science and Engineering Division.
Their research will examine the effects of micro-gravity on an internal combustion engine.
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Space-flight profiles up to 140 miles / 225 km with a wide range of micro-gravity options.
Someone who would be able to do experiments in space, mainly to look at the effect of micro-gravity on the body, but also working with crystals and various micro-organisms.
Capable of up to four flights per day, the Lynx is expected to provide three to four minutes of micro-gravity and/or exposure to the harsh environment of space and the opportunity to investigate largely unknown regions of our upper atmosphere critical to environmental studies.
All you need to know now is when and to micro-gravity, conducting experiments related to astronomy, biology, chemistry, technology and medicine.
Research, engineering, and educational communities interested in using the Lynx should contact XCOR directly regarding scientific, earth observation, materials science, upper-atmospheric weather research, and micro-gravity experiments at www.
Her published research in biomechanics has been used to assist the physically disabled as well as to increase understanding of effects of micro-gravity on the human body.
These services, which include micro-gravity testing and Space Shuttle pilot training, will be performed on aircraft assigned to the Johnson Space Center in Houston, Texas; the Dryden Flight Research Center at Edwards Air Force Base, Calif.
Payload Systems has quietly built a strong reputation over the past 20 years as the place to turn when companies need superior support for unique challenges related to gravity and micro-gravity experiments," said Jennifer Laden, president and co-founder of Duende Communications.