although the biology and ecology of the arthropod vectors are different, some factors, such as global warming, the increasing abundance of mosquitoes, the movement of domestic hosts, and the abundance of wild reservoirs, can act as favourable factors for the distribution of infections. the aim of this study was to determine the prevalence of dirofilaria immitis infection in shepherd dogs living...

C R E D IT : IS T O C K P H O T O .C O M D uring the past 100,000 to 200,000 years, anatomically modern humans successfully colonized a diverse range of environments across the planet. Some of the most extreme of these environments are found on the high-altitude plateaus of Central Asia and the Andes. The Tibetan Plateau appears to have been inhabited for ~25,000 years, and permanent settlement...

It has been clearly recognized that a low barometric pressure, when first encountered, may interfere with the normal workings of the human machine, but that later by compensatory responses the body may become adapted to the new conditions. The outstanding variable encountered in ascents to high altitudes by airplane, dirigible, free balloon, or mountaineering is the tenuousness of the atmospher...

Sir,?Major P. Savage, i.m.s., in the June number of your journal lias recorded the apparent occurrence of indigenous kala-azar at Sanawar in the Simla Hills, where up to that time the presence of Phlcbotomus argcntipcs, the suspected carrier of kala-azar, had not been reported. It is, therefore, of interest to note that in a collection of Phlcbotomus from Sanawar village, kindly given me by Cap...

ZAPATA-ORTIZ, VICENTE, RAMIRO CASTRO DE LA MATA, ENRIQUE FERNANDEZ, ARTURO GEU, AND LUIS BATALLA. Bronchial circulation in high altitudes. Am. J. Physiol. 2 I 2 (6) : I #j41468. 1967. -Bronchial circulation and bronchopulmonary anastomoses have been studied in two groups of sheep native to the high Andes (above 4,000 m) and to the Peruvian coastal plain. The high altitude-adapted animals showed...

Introduction Conclusions References Tables Figures Back Close Abstract Introduction Conclusions References Tables Figures Back Close Abstract In the past, many studies have been carried out to demonstrate the influence of me-teoroids on the atmospheric metal layer, observed roughly in the altitude range 80– 105 km. Even with the capability of present day resonance lidars to measure metal densit...