Results 171 to 180 of about 4,869 (218)

Hypergravity results in human platelet hyperactivity

Journal of Physiology and Biochemistry, 2009
Thrombotic diseases or fatalities have been reported to occasionally occur under conditions of hypergravity although the mechanism is still unclear. To investigate the effect of hypergravity on platelets that are the primary players in thrombus formation, platelet rich plasma (PRP) or washed platelets were exposed to hypergravity at 8 G for 15 minutes.
S, Li, Q, Shi, Z, Wang, R, Yan, H, Cheng, K, Dai   +5 more
openaire   +2 more sources

Hypergravity modulates behavioral nociceptive responses in rats

Advances in Space Research, 2002
Hypergravity (2G) exposure elevated the nociceptive threshold (pain suppression) concomitantly with evoked neuronal activity in the hypothalamus. Young Wistar male rats were exposed to 2G by centrifugal rotation for 10 min. Before and after 2G exposure, the nociceptive threshold was measured as the withdrawal reflex by using the von Frey type needle at
Y, Kumei, R, Shimokawa, K, Toda, Y, Kawauchi, K, Makita, M, Terasawa, K, Ohya, H, Shimokawa   +7 more
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Effects of simulated hypergravity on biomedical experiments

IEEE Engineering in Medicine and Biology Magazine, 2007
This article presents the conception and development of a centrifuge for hypergravity research use. Experiments were recorded via a digital camera and the images acquired were processed for better visualization of the effects of simulated variation of gravitational force on models of living systems and plant germination. Four different test models were
Thais, Russomano, Mara R, Rizzatti, Rodrigo P, Coelho, Diogo, Scolari, Daniel, De Souza, Paula, Prá-Veleda   +5 more
openaire   +2 more sources

Experiments with osteoblasts cultured under hypergravity conditions

Microgravity - Science and Technology, 2004
To understand further the role of gravity in osteoblast attachment, osteoblasts were subjected to hypergravity conditions in vitro. Scanning electron microscopy of all confluent coverslips from FPA units show that the number of attached osteoblasts was similar among gravitational levels and growth durations (~90 cells/microscopic field).
Melissa A, Kacena, Paul, Todd, Louis C, Gerstenfeld, William J, Landis   +3 more
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Inconsistency of topologically massive hypergravity

Classical and Quantum Gravity, 1985
The coupled topologically massive spin-5/2 gravity system in D = 3 dimensions whose kinematics represents dynamical propagating gauge invariant massive spin-5/2 and spin-2 excitations, is shown to be inconsistent, or equivalently, not locally hypersymmetric. In contrast to D = 4, the local constraints on the system arising from failure of the fermionic
C Aragone, S Deser
openaire   +1 more source

Behaviour of adult hamsters subjected to hypergravity

Journal of Vestibular Research, 1999
We studied vestibular function in 20 adult hamsters (3 months old) subjected to either prolonged hypergravity (n=10) or normal gravity (n=10) for 2 months. Locomotion and swimming of the hypergravity hamsters under light conditions were normal. Equilibrium maintenance was severely disturbed; only 6 of 10 hypergravity hamsters managed to walk on the ...
H N, Sondag, H A, de Jong, W J, Oosterveld   +2 more
openaire   +2 more sources

Hypergravity effects on myoblast proliferation and differentiation

Journal of Bioscience and Bioengineering, 2012
This study aimed at the investigation of behavior of myoblasts in conditions of altered gravity. C2C12 cells underwent stimulations by different hypergravity intensities (2 h at 5 g, 10 g, and 20 g) in the Large Diameter Centrifuge of the European Space Agency (ESA), highlighting positive effects on both proliferation and differentiation.
G. Ciofani, L. Ricotti, Rigosa, Jacopo, A. Menciassi, V. Mattoli, M. Monici   +5 more
openaire   +3 more sources

Otoconial alterations after embryonic development in hypergravity

Brain Research Bulletin, 1996
The relation between prolonged hypergravity and structural adaptation of otoconia was studied in hamsters (n = 56). Three groups of hamsters (n = 27), were conceived and born in a centrifuge: group 1 (n = 10) 1 month under 2.5 G, group 2 (n = 9) 5 months under 2.5 G and 4 months under 1 G, group 3 (n = 8) 1 month under 2.5 G and 8 months under 1 G ...
H N, Sondag, H A, De Jong, J, Van Marle, B, Willekens, W J, Oosterveld   +4 more
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Hypergravity, aging and longevity in Drosophila melanogaster

Comparative Biochemistry and Physiology Part A: Physiology, 1993
1. Drosophila melanogaster flies have been used in studies of the effect of hypergravity (HG) on aging and longevity. 2. There is no clear longevity decrease with the gravity level up to 4 g and, even at 7 g, flies still live for roughly 40 days. 3. The HG-related changes in fecundity suggest that flies counteract an increased metabolic demand.
E, Le Bourg, F A, Lints, N, Fresquet, P, Bullens   +3 more
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Polychromatic percepts during hypergravity.

Journal of gravitational physiology : a journal of the International Society for Gravitational Physiology, 2000
Future helmet mounted systems and cockpit displays will rely on color graphics and information that high performance aircraft pilots will need to discern and understand. Color in displays may help reduce pilot workload. The effect of high G and reduced eye level blood pressure on field-of-view has been study extensively.
T, Chelette, R, Allnutt, L, Tripp, R, Esken, S, Bolia, D, Post   +5 more
openaire   +1 more source