Mostafa A Shirazi

  • Citations Per Year
Learn More
Avian dietary toxicity tests were conducted with seven pesticides, two age groups (2 and 16 weeks old) of northern bobwhite (Colinus virginianus) and two durations (5 and 28 days) of exposure. Results were analyzed with an emphasis placed upon comparing mortalities on similar test conditions. An analysis that used the entire dose-time-response results led(More)
Soils support ecosystem functions such as plant growth and water quality because of certain physical, chemical, and biological properties. These properties have been studied at different spatial scales, including point scales to satisfy basic research needs, and regional scales to satisfy monitoring needs. Recently, soil property data for the entire USA(More)
Biological effects data with single chemicals are far more abundant than with mixtures. Yet, environmental exposures to chemical mixtures, for example near hazardous waste sites or non point sources, are very common and using test data from single chemicals to approximate effects of mixtures can be useful in environmental risk assessment. To facilitate the(More)
The Surface Waters component of the Environmental Monitoring and Assessment Program (EMAPSW) was developed by the USEPA to evaluate the extent and condition of lakes and streams over national and regional scales. Realistically, chemical or physical water properties (WPs) such as acidity or turbidity can be field-sampled for only a small portion of all lakes(More)
Chemical compounds known to be teratogenic to frog embryos were tested singly and in binary mixtures and Weibull functions were used to model their concentration-response relationships. A separate Weibull function with an additive concentration variable modeled the mixtures using only single chemical test data. Seven chemicals in five binary mixtures at(More)
The immunomodulation response of mice to low levels of aldicarb in drinking water was investigated in four series of studies. The splenic plaque forming cell (PFC) response to red sheep cells were measured for treatment levels of 0.01 to 1,000 ppb (micrograms/kg). Based on their beginning and end body weights, the animal populations were uniform in all(More)
In this paper, we define a mode of biological response of an organism to a chemical in terms of a general mathematical model of the response surface. The model describes the combined effects of dose-level exposure and time-duration exposure using 570 96-hr toxicity tests with fathead minnows. The response surface along the dose and time axes for each(More)
Researchers have defined and mapped ecological regions of the United States based on similar patterns of ecosystems such as deserts, forests, and croplands. These studies are useful in regional research, monitoring, and environmental management because data can be more readily extrapolated within the same ecoregion and to regions with similar(More)