extensive distribution of hazardous substances in food chain and the deleterious effect of their residues on public health are a great concern of the society. chicken eggs, as one of the most popular food commodities, in different parts of tehran (iran) were analyzed for two groups of hazardous substances including some organochlorine pesticides (oc) such as aldrin, lindane, dieldrin, dichlorod...

Subacute experiments were carried out on rabbits by daily oral administration of Lindane, Malathion and Dichlorophos. A dose-dependent significant decrease in Salmonella typhi induced immune response was found in sera of animals treated with these pesticides compared to untreated controls. Inihbition of cholinesterase activity confirmed the immunological findings.

We used a two-step enrichment approach to isolate root-colonizing hexachlorocyclohexane (HCH)-degrading microorganisms. The first step consists of the use of classical liquid enrichment to isolate γ-HCH degraders. The γ-HCH-degrading microbes were attached in mass to corn seeds sown in soil with γ-HCH, and after plant development we rescued bacteria growing on root tips. Bacteria were then subj...