| importance of passive diffusion in the uptake of polychlorinated biphenyls by phagotrophic protozoa. | unicellular protozoan grazers represent a size class of organisms where a transition in the mechanism of chlorobiphenyl (cb) introduction, from diffusion through surface membranes to ingestion of contaminated prey, could occur. this study compares the relative importance of these two processes in the overall uptake of polychlorinated biphenyls by protists. uptake rates and steady-state concentrations were compared in laboratory cultures of grazing and nongrazing protozoa. these experiments were ... | 2000 | 10788371 |