نتایج جستجو برای: substances
تعداد نتایج: 56173 فیلتر نتایج به سال:
Objective: The aim of this study was to investigate the structural model of the role of environmental and family factors in the developmental prevention of the tendency to use drugs and psychotropic substances. Method: The research was descriptive-correlational. The statistical population of the study included Children and adolescents in Karaj who had used drugs or psychotropic substances at le...
Soil carbon sequestration is strongly affected by soil properties, climate, and anthropogenic activities. Assessing these drivers is key to understanding the effect of land use on soil organic matter stabilization. We evaluated land use and soil depth influencing patterns of soil organic matter stabilization in three types of soil profiles located under the same pedogenetic matrix and alpine co...
CONTEXT Doping has been pervasive throughout the history of athletic competitions and has only recently been regulated by organizations such as the World Anti-Doping Agency (WADA), US Anti-Doping Agency (USADA), and the National Collegiate Athletic Association (NCAA). These regulatory bodies were created to preserve fair play and maintain the safety of the participants. Their updated 2013 lists...
The following is a review of the studies carried out in this laboratory during the past seven or eight years with the view of (a) elucidating the effect of certain exogenous tumor-producing chemical agents and (b) ascertaining the presence within the human body of chemical substances that may call forth the formation of tumors. The present review is based in the main on the results obtained by ...
Some pharmacological and chemical qualities of pherentasin, a vasoconstrictor substance procured from human hypertensive blood, were studied by a new assay method using the spirally cut rabbit aorta. Of a number of drugs tested, six metal-binding agents including hydralazine inactivated the active principle. The material was stable in acid but not in alkali. It was destroyed by drying. Chemical...
OPPT has been assessing perfluor,inated compounds since 1999. This interest was prompted by reports submitted to the agency describing the toxic properties and widespread presence in the environment, including in human populations, of some of these chemicals. Initial efforts focused on perfluorooctane sulfonate (PFOS), and the assessment of ecological and human health hazards was recently publi...
Pherentasin is the only pressor substance found in blood of hypertensive patients which is not found in normal blood. This study defines its unit and compares its concentration with diastolic blood pressure level, type of hypertension, and age of patients. Lack of correlation between blood pressure level and pherentasin content suggests considerable variation in the amount of depressor substanc...
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