منابع مشابه
Weightlessness and skeleton homeostasis.
As human beings venture into space in the 21st century, they will be confronted with a "hypodynamic" and thus hostile environment for the bone homeostasis, that could potentially compromise their mobility in general and skeletal strength in particular after landing. From this point of view, space flight studies are especially interesting and intriguing models for scientists. Space studies, howe...
متن کاملEffects of tumors on the skeleton and calcium homeostasis
15 Tumors cause multiple effects on the skeleton and on calcium homeostasis, but they do so in specific patterns which are becoming better defined as the mediators responsible become more fully characterized. Metastatic bone disease occurs in the majority of patients with advanced cancer, and is particularly frequent in breast, lung and prostate cancers, which are the most common of all human t...
متن کاملPhysics and psychophysics of weightlessness.
T H E D E V E L O P M E N T of aviation is directed toward ever increasing velocities and altitudes. Already, today, aircraft fly at altitudes at which the density of the atmosphere is extremely low. According to the principles of mechanics, reduction or entire lack of weight will ensue during coasting maneuvers at high altitudes because mechanical support by the atmosphere is lacking/ Conseque...
متن کاملPhysics and psychophysics of weightlessness; visual perception.
I N A P R E V I O U S paper the attempt was made to elaborate some physical and psychophysical principles which determine the behavior of the human body under conditions of partial or entire lack of weight. 35 I t was shown that subsequently to a transition of the body into the gravityfree state the field of elastic forces acting in the interior and on the surface of the body will attain a new ...
متن کاملEffects of Transient Weightlessness on Brightness Discrimination.
Contrast thresholds of six semisupine, visually adapted subjects were obtained under short (10-14 sec.) periods of weightlessness and under 1 G control conditions. The target, viewed binocularly, subtended 1.5 ~ and the background 2.6*. Three background luminance levels were used: 0.03, 0.28 and 30.0 ft-L. The contrast required to detect the target was found to be slightly, but consistently, lo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: HORMONES
سال: 2005
ISSN: 1109-3099
DOI: 10.14310/horm.2002.11139