Changes in cerebral perfusion and CO2 cerebrovascular reactivity during and immediately after a sojourn at high altitude remain unclear but may be critical for acclimatization. The aim of the present study was to assess the effects of 6days at 4350m on cerebral perfusion and cerebrovascular reactivity (CVR) to CO2 by arterial spin labeling (ASL) magnetic resonance imaging at sea level and to co...

The subfossil assemblages of Chydoridae from Late Glacial/Preboreal sediments of four sites from 603 m to 2290 m asl were analysed to trace the community response to rapid climatic warming that occurred at this period of time. In each site, distinct signals at the Younger Dryas/Preboreal boundary were recorded by density of remains, species diversity or community composition. However, responses...

In mountain ecosystems, it is crucial to identify conservation strategies avoid local extinctions mainly due agropastoral abandonment. For this purpose, identifying appropriate system indicators required, for example, butterflies, which respond precisely and quickly environmental changes. Zerynthia polyxena an ecotonal species of butterfly, thus, through its could be possible protect clearing s...

Introduction The blood transit time from arterial spin labeling plane to capillaries in the imaging slice (referred to as “tissue transit time”) decreased during neuronal activation in humans (1), while it appeared no changes during somatosensory stimulation in rats (2). Since a tissue transit time is shorter in rats compared to humans, shortening blood transit time may not be detectable with a...

background & aim: thymus daenensis celak. is one of the herbal and  perennial medicinal plants belonging to lamiaceae which grows widely in isfahan and chaharmahal va bakhtiari provinces. all of its floral on aerial part has extensive use in preparing traditional medicines. the major constitutes of thymus daenensis celak. are thymol and carvacrol. since ecological conditions have a great ro...

conclusions antimicrobial and antitoxigenic properties of natural products need a firmly established criterion before they could be offered to application. results a significant reduction in aflatoxin production was noted which was not due to the inhibitory effect but because of antifungal property of the oil. interestingly, the oil promoted toxin production for the reasons yet to be investigat...

Juniperus macropoda is the only tree species of a cold desert ecosystem that experiencing high anthropogenic pressure and has poor regeneration status due to harsh environmental conditions. Due limited distribution in this region, have remained largely unexplored terms understanding pattern along elevation soil fertility gradients. Therefore, current research was carried out elevational gradien...

Visceral leishmaniasis (VL) or kala-azar mainly affects children in endemic areas. This study was conducted to determine the seroprevalence of VL using direct agglutination test (DAT) in children living in rural districts of Alborz Province located 30 km from Tehran capital city of Iran. Multi-stage cluster random sampling was applied. Blood samples were randomly collected from 1,007 children u...