background and aim: occupational stress is one of the key factors in reducing staff productivity in organizations with physical and psychological impacts on employees. nursing and midwifery are among the most stressful professions. therefore, this study aimed to determine the relationship between occupational stress and work ability of midwives in mashhad, iran in 2011. materials and methods: t...

the genetics and mechanism of malathion resistance in the adults of an. stephensi (ban-s), was studied. nine successive generations of malathion selection in the adults resulted in an increase in ltso of about 3-fold. the crossing experiments indicated that the resistance is inherited as partially dominant character with no indication of sex linkage. the results of back-crosses suggested that p...