AIMS We investigated changes in volume regulating hormones and renal function at high altitudes and across gender. METHODOLOGY Included in this study were 28 subjects (n = 20 males; n = 8 females. ages: 19 - 65 yrs), who ascended to a height of 3440m (HA1), on the 3rd day and to 5050m (HA2), on the 14th day. Plasma and urinary creatinine and urinary osmolality as well as plasma levels of plas...

Right heart failure secondary to pulmonary hypertension is a leading cause of mortality among suckling beef calves in the Rocky Mountain region. The objective of this study was to track changes in pulmonary arterial pressures (PAP) in healthy calves born and raised at altitudes ranging from 1,470 to 2,730 m. It was hypothesized that calves located at higher altitudes would show a greater increa...

Eaton et al. (1) stated that "increased, rather than decreased, oxygen affinity is an effective mode of short-term adaptation to markedly reduced environmental oxygen pressures" and pointed out the need to reevaluate the idea that "decreased hemoglobin-oxygen affinity is of adaptive value to humans at high altitudes." We fully agree with these authors and wish to call attention to the fact that...

We have studied the pulmonary circulation of three closely related animals, the llama, alpaca, and guanaco. The mean pulmonary arterial pressure of 12 llamas and one alpaca indigenous to high altitude in the Andes was found to be slightly but significantly higher than that of three llamas and three guanacos born and bred at low altitude in England. On the other hand, the medial thickness of the...

At high altitudes in the Earth’s atmosphere cosmic-ray induced neutrons become the dominant contributors to the biologically relevant dose equivalent. Depending on the geomagnetic latitude and the solar activity cycle, neutron dose onboard aircraft amounts to about 50 to 70 % of the overall dose equivalent. Neutron detection in complexly mixed radiation environments by means of active, i.e. pow...

the focus of the present study was to investigate the chemical composition of essential oil of salvia hydrangea dc. ex benth. growing wild in kiasar-hezarjrib, iran. in addition, effects of altitude and some soil properties on the essential oil quality and quantity of s. hydrangea was identified. the samples collected from two altitudes (1100 and 2000 m) in blossoming period, were analyzed by h...

The audible noise (AN) induced by corona discharge of AC transmission lines is more severe at high altitudes than at low altitudes; this has become a crucial limiting factor for the structural design of power lines and their environmental impact assessment. To determine the altitude effect and correction of AN level for AC power lines, a corona cage test system was used to measure the acoustic ...

a t s In the state of Veracruz, Mexico, fruits from 38 sites at various altitudes were collected monthly over a period of 2 years, and the tephritid fruit flies of the genus Anastrepha and associated parasitoids that emerged rom these fruits were identified and counted. Of the 6 species of fruits that contained Anastrepha larvae, 18 species also contained a total of 10 species of Anastrepha par...

The human respiratory system is a well developed and complex system which is constantly being perturbed by physiologic disturbances. Engineering performed good support in modeling and simulation of the various functional systems of the human body. The modeling of respiratory of the human body is required to understand its operation and pathologies present. This paper describes a steady state mo...