Effects of organic chelators on Pb uptake and translocation in Phragmites australis Selection of appropriate natural botanic chelators for mobilization of heavy metals in soils EFFECTS OF COPPER ON THE CHLOROPHYLLPROTEIN COMPLEXES COMPONENTS AND SOME SPECTRAL PROPERTIES OF CHLOROPLAST THYLAKOID MEMBRANES MOLECULAR MECHANISMS OF PLANT TOLERANCE TO HEAVY METALS Effect of surfactants and EDTA on cadmium bioaccumulation by Brassica juncea var. multiceps