Results 231 to 240 of about 953,722 (278)
Some of the next articles are maybe not open access.
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 ...
openaire +1 more source
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 ...
openaire +1 more source
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
openaire +4 more sources
[Changes of leg compliance during weightlessness or simulated weightlessness].
Hang tian yi xue yu yi xue gong cheng = Space medicine & medical engineering, 2002Weightlessness or simulated weightlessness causes increase of leg compliance. It leads to more blood pooling in the legs and less blood returning to the heart during orthostatic test, which may partly explain the occurrence of orthostatic intolerance induced by weightlessness or simulated weightlessness.
Wen-bin, Liang +2 more
openaire +1 more source
[Mechanism of cardiac atrophy under weightlessness/simulated weightlessness].
Sheng li xue bao : [Acta physiologica Sinica], 2017Cardiac remodeling is the heart's response to external or internal stimuli. Weightlessness/simulated weightlessness leads to cardiac atrophy and heart function declining. Understanding the mechanism of cardiac atrophy under weightlessness is important to help astronaut recover from unloading-induced cardiovascular changes after spaceflight.
Guo-Hui, Zhong +2 more
openaire +1 more source
[Changes of cerebral circulation during weightlessness or simulated weightlessness].
Hang tian yi xue yu yi xue gong cheng = Space medicine & medical engineering, 2002The results about studies on changes of the cerebral circulation during weightlessness/simulated weightlessness were reviewed in this paper. The possible influencing mechanism of weightlessness on cerebral circulation and its physiological significance were summarized.
D W, Wu, X Y, Shen
openaire +1 more source
Effects of simulated weightlessness on bone properties in rats
Journal of Biomechanics, 1990Abstract This paper addresses two questions: (1) are reductions in bone apposition rate during disuse due to increased periods of ‘resting’ during bone formation? and (2) are diaphyseal strength changes due to disuse caused by changes in the quality as well as the quantity of the bone matrix?
openaire +2 more sources
Research advance in effects of weightlessness or simulated weightlessness on tumor cells.
Zhongguo yi xue ke xue yuan xue bao. Acta Academiae Medicinae Sinicae, 2014Weightless environment is a rare phenomenon on the ground where the interactions among cells and internal cellular structures disappear or become weakened. Studies on the biological features and molecular expression of tumors cells in weightlessness condition may provide new clues to the tumor initiation, process, diagnosis, and therapy.
De, Chang +2 more
openaire +1 more source
[Changes of learning and memory function under weightlessness or simulated weightlessness].
Hang tian yi xue yu yi xue gong cheng = Space medicine & medical engineering, 2002The work efficiency of astronauts has an intimate connection with the brain function state during space flight. The research results of the learning and memory mechanism of the brain in recent years were introduced. The effects of weightlessness or simulated weightlessness on brain's learning, memory, focused attention and many other higher neural ...
D W, Wu, X Y, Shen
openaire +1 more source
[Thermoregulation under simulated weightlessness].
Hang tian yi xue yu yi xue gong cheng = Space medicine & medical engineering, 1998The effect of simulated weightlessness on thermoregulation was studied in 5 subjects. The experiment consisted of 3d baseline measurements, 7d head-down bed rest and 2d recovery. Circadian rhythm was assessed by continuous measurements of rectal temperature and skin temperature with 2h intervals.
M, Qiu +5 more
openaire +1 more source
[Metabolic changes in simulated weightlessness].
Anesteziologiia i reanimatologiia, 19908 healthy subjects participated in 2 series of experiments on the comparative studies of two techniques of respiratory therapy employing multicomponent anesthesia during controlled lung ventilation in normal conditions and in experimental weightlessness.
L L, Stazhadze +3 more
openaire +1 more source