Results 191 to 200 of about 1,879 (242)
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Study of Temperature Homeostasis in Real and Simulated Weightlessness
Human Physiology, 2002The analysis of the temperature (T) reaction of the body of healthy humans was carried out using the results of investigations with the thermometry technique under antiorthostatic hypokinesia (ANOH) (38 males in the studies of 14- to 49-day duration, eight females, 120 days), isolation in a regenerated gas environment (six males, 90 to 135 days), suit ...
N G, Lakota, I M, Larina
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A mathematical and experimental simulation of the hematological response to weightlessness
Acta Astronautica, 1979Two ground-based methods of weightlessness simulation--a computer model of erythropoiesis feedback regulation and bedrest--were used to investigate the mechanisms which lead to loss of red cell mass during spaceflight. Both methods were used to simulate the first Skylab mission of 28 days.
S L, Kimzey, J I, Leonard, P C, Johnson
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Effects of muscle electrostimulation during simulated weightlessness
Acta Astronautica, 1975In a 45-day experiment test subjects were exposed to bed rest with their heads down at -4 degrees C. Twice a day their muscles of the stomach, back, femur, and shin were stimulated with electric current for 25-30 min. The value of muscle tension was close to their maximum voluntary contraction.
L I, Kakurin +3 more
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Skeletal abnormalities in rats induced by simulated weightlessness
Metabolic Bone Disease and Related Research, 1982A hypokinetic model has been developed which attempts to simulate the weightlessness experienced during space flight. Male rats (approximately 130 g) were suspended from the model with a head-down tilt for a two-week period. Total mechanical unloading of the hind limbs and partial unloading of the fore limbs occurred.
T J, Wronski, E R, Morey
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Evaluation of the three-dimensional clinostat as a simulator of weightlessness
Planta, 1997Concerns regarding the reliability of slow-and fast-rotating uni-axial clinostats in simulating weightlessness have induced the construction of devices considered to simulate weightlessness more adequately. A new three-dimensional (3-D) clinostat equipped with two rotation axes placed at right angles has been constructed. In the clinostat, the rotation
T, Hoson +4 more
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Effects of Simulated Weightlessness on Bone Mineral Metabolism
Endocrinology, 1984Space flight and bedrest result in a negative calcium balance and osteopenia. The mechanisms underlying these events are not well understood. In particular, it is not clear whether systemic or local factors are preeminent in mediating the effects of gravity on bone mineral content.
R K, Globus, D D, Bikle, E, Morey-Holton
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[Weightlessness or weightlessness simulation and vascular remodeling].
Hang tian yi xue yu yi xue gong cheng = Space medicine & medical engineering, 2003Weightlessness is inavoidable during spaceflight. It brings profound physiological effects on human body. Vascular remodeling is one of the important changes of cardiovascular system caused by weightlessness or simulated weightlessness. The paper summarized the studies on the effects of weightlessness or weightlessness simulation on vascular remodeling
Yong, Yue +3 more
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Human Autonomic Responses to Actual and Simulated Weightlessness
The Journal of Clinical Pharmacology, 1991Orthostatic dysfunction occurs after exposure to microgravity, and is not completely understood. The authors developed a device for stimulating carotid baroreceptors to test the hypothesis that exposure to microgravity leads to impairment of arterial baroreflex mechanisms.
D L, Eckberg, J M, Fritsch
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1986
The phenomenon of gravitation is characterized by the mutual attraction of any two bodies. The universal character of gravitation was first recognized by Isaac Newton who found the well-known law for the attraction force F acting between two mass points or homogeneous spherical bodies $$\rm F\, = \,\gamma Mm/R^2 $$ (3.1) M, m are the masses ...
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The phenomenon of gravitation is characterized by the mutual attraction of any two bodies. The universal character of gravitation was first recognized by Isaac Newton who found the well-known law for the attraction force F acting between two mass points or homogeneous spherical bodies $$\rm F\, = \,\gamma Mm/R^2 $$ (3.1) M, m are the masses ...
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Simulated Weightlessness in the Design and Exploitation of a NMR-Compatible Bioreactor
Biotechnology Progress, 2004Mammalian cells cultured in simulated weightlessness take advantage of a favorable environment, experiencing low shear stress and reduced turbulence. NMR spectroscopy allows the on-line noninvasive monitoring of cell growth and metabolism. With this in mind, we developed a novel bioreactor that fits into a NMR instrument and in which the simulated ...
Bradamante S, Barenghi L, Villa A
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