Eco-physiological responses of Polytrichum commune to soil contamination by polychlorinated biphenyls Effect of PCBs on microbial and enzyme activities in vegetated and non-vegetated mangrove sediments The advance in environmental eco-toxicology of polychlorinated biphenyls Analysis of PCBs in the sediments and fish from freshwater fishponds in the Pearl River Delta, China A Review on the Sources,Distribution and Metabolism of PCBs in Plants