Acute exposures to isobutane, propane, F-12, and F-11 in concentrations of 250, 500, or 1000 ppm for periods of 1 min to 8 hr did not produce any untoward physiological effects as determined by the methods employed which included serial EKG's and continuous monitoring of modified V5 by telemetry during exposure. Repetitive exposures to these four propellants were also without measurable untowar...

Selection studies are useful if they can provide us with insights into the patterns and processes of evolution in populations under controlled conditions. In this context it is particularly valuable to be able to analyze the limitations of and constraints on evolutionary responses to allow predictions concerning evolutionary change. The concept of a selection pathway is presented as a means of ...

Background : There are growing evidences for chromosomal radioadaptive response in human lymphocytes . Highly variable inter- and intra-individual responses have been reported. Some individuals are non-responders and even in some donors the frequency of chromatid aberrations induced by a challenge dose increases by pre-exposure to an adapting dose. It has been proposed that the lack of radioada...

The purpose of this study was to evaluate the physiological and biochemical changes that occur in mulberry (cv. local and Sujanpuri) plants under alkaline conditions in order to understand the response of these cultivars to alkalinity. Mulberry plants were subjected to different treatments using NaHCO3 and after 20, 40 and 60 days, different physiological and biochemical parameters were studied...

rhizomania disease is one of the most important threats to worldwide and iran sugar beet cultivation. many studies have been done to understanding the physiological effects of the disease on sugar beet, but in iran conditions has not been done any study for this purpose. this experiment was conducted with four sugar beet cultivars named as brigita, zarghan, jolge and rasoul in 2010 and natural ...