Blackwell Publishing Journal Backfiles 1879-2005
Abstract. The absorption of Cd by potato tissue was studied. No enhancement of the absorption capacity for Cd was observed by storage of the sliced potato tissue in aerated doubly distilled water for a period of 48 h. Cd absorption as a function of the external Cd concentration followed a typical hyperbolic isotherm. A two-phase uptake process for the absorption of Cd was found: a rapid initial phase terminating after 30 min, was followed by a slower phase with a constant rate. Efflux, studied by means of compartmental analysis, of Cd showed three phases. The two first were shown to be extracellular in origin. The third phase, involving Cd remaining in the discs after efflux, probably involved Cd in different forms. Metabolic processes, however, did not seem to contribute to this phase.
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