the embryotropic effect of the new bulgarian simtriazine herbicide polyzin 50 was studied in an experiment upon 90 pregnant albino rats - wistar , via inhalation effect in concentrations 2 mg/m3 and 0.2 mg/m3 , daily during the whole pregnancy and at a level of 2 mg/m3 during the first trimester of gestation .
C0032961
pregnancy
C0032979
first trimester of