Results 201 to 210 of about 1,055,858 (237)

Metabolic Modeling in Altered Gravity

2020 IEEE Aerospace Conference, 2020
This paper explores the extension of an existing 21-compartment lumped-parameter hemodynamic model of the cardiovascular system to incorporate pulmonary function and metabolic gas transport. The existing model allows study of the acute responses of cardiovascular system parameters (pressures, volumes, resistances, heart rate) with and without exercise ...
Richard S. Whittle, Ana Diaz-Artiles
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Osteogenesis in altered gravity

2002
Publisher Summary Bones are continuously remodelled as a result of the coupled bone resorption and bone formation activities. When these two activities cease to be in dynamic equilibrium, excess bone may be reabsorbed and/or insufficient new bone is formed.
Ranieri, Cancedda, Anita, Muraglia
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REGULATION OF HAEMOPOIESIS IN ALTERED GRAVITY

Biological Reviews, 1981
Summary(1) The aetiology of one of the most striking physiological changes occurring during space‐flight, the loss of red blood cells, remains unknown, and its precise time‐pattern in flight has not yet been studied.(2) It is suggested that the changes during space‐flight responsible for loss of red blood cells in man are (a) loss of plasma volume ...
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Plant Secondary Metabolism in Altered Gravity

2009
Plans by the space program to use plants for food supply and environmental regeneration have led to an examination of how plants grow in microgravity. Because secondary metabolic compounds are so important in determining the nutritional and flavor characteristics of plants-as well as making plants more resistant to biotic and abiotic stresses-their ...
Lindsey K, Tuominen, Lanfang H, Levine, Mary E, Musgrave   +2 more
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Effects of altered gravity on the swimming behaviour of fish

Advances in Space Research, 2002
Humans taking part in parabolic aircraft flights (PAFs) may suffer from space motion sickness-phenomena (SMS, a kinetosis). It has been argued that SMS during PAFs might not be based on microgravity alone but rather on changing accelerations from 0 g to 2 g. We test here the hypothesis that PAF-induced kinetosis is based on asymmetric statoliths (i.e.,
R, Hilbig, R H, Anken, G, Sonntag, S, Hohne, J, Henneberg, N, Kretschmer, H, Rahmann   +6 more
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Neurobiology of fish under altered gravity conditions

Brain Research Reviews, 1998
In vertebrates (including man), an altered gravitational environment such as weightlessness can induce malfunction of the inner ear, based on an irregular dislocation of the otoliths from the corresponding sensory epithelia. This dislocation leads to an illusionary tilt, since the otolithic inputs are not in register with other sensory organs.
R H, Anken, M, Ibsch, H, Rahmann
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The effect of altered gravity states on the perception of orientation

Experimental Brain Research, 2009
We measured the effect of the orientation of the visual background on the perceptual upright (PU) under different levels of gravity. Brief periods of micro- and hypergravity conditions were created using two series of parabolic flights. Control measures were taken in the laboratory under normal gravity with subjects upright, right side down and supine.
Richard T, Dyde, Michael R, Jenkin, Heather L, Jenkin, James E, Zacher, Laurence R, Harris   +4 more
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Development of gravity-sensing organs in altered gravity.

Gravitational and space biology bulletin : publication of the American Society for Gravitational and Space Biology, 1998
Experiments are described in which the development of the gravity-sensing organs was studied in newt larvae reared in microgravity on the IML-2 mission and in Aplysia embryos and larvae reared on a centrifuge at 1 to 5 g. In Aplysia embryos, the statolith (single dense mass on which gravity and linear acceleration act) was reduced in size in a graded ...
M L, Wiederhold, W Y, Gao, J L, Harrison, R, Hejl   +3 more
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Graviresponses of Osteocytes Under Altered Gravity

Advances in Space Research, 2011
Abstract Single cell was capable of sensing and responding to alterations of gravity. Osteocytes, as the most abundant cells of the bone tissue playing an important role in the bone mechanotransduction, are very sensitive to mechanical stimuli. However, the effect of altered gravity on osteocytes so far is less known according to the public papers ...
S.M. Di, A.R. Qian, L.N. Qu, W. Zhang, Z. Wang, C. Ding, Y.H. Li, H.G. Ren, P. Shang   +8 more
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Cerebellum and Gravity: Altered Earth’s Gravity Perception Under Pathological Conditions and Response to Altered Gravity in Space

2013
Life on Earth has developed under the influence of gravity and remains adapted to unit gravity. As different organisms evolved to survive optimally in water, ground, and air habitats, special adaptive mechanisms developed to deal with gravity. In humans and most land mammals, maintaining postural equilibrium requires constant integration of visual ...
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