the most used quechers and gas chromatography methods were performed, to evaluate the presence of organochlorines, organophosphate, polychlorinated biphenyl and chlorobenzenes in water and in fish. according to the standard iso iec 17025, a recovery rate obtained ranged from 70 to 120% assessing the reliability of analysis results. the exceed rate in fish of malathion is 22.2, and 5.2 ppm in sa...

eight wheat varieties some of which were earlier reported to be resistant to pythium arrhennmanes, were inoculated with p. arrhenomanes. inoculation was performed by placing 2-day-old seedlings on the edge of a p. arrhenomanes culture on corn meal agar for 3 h at 25°c. infected seedlings were then transferred to test tubes (9 mm dia.) containing glass beads and 1 ml of sterile water, and in...