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PLANT PHYSIOLOGY sections (or, rather, on the dimensions of the gaps between the cut surfaces of neighboring sections).) SUMMARYThe variation with tissue dimensions of the halftimes of osmosis and self-diffusion, the manner in which half-times of individual cells vary with cell position within the tissue, and the internal gradients within tissue during such phenomena are analyzed. These processes may be described mathematically by means of a diffusion equation, and the basic parameter characterizing the dynamics of the process is the diffusivity, D. The data of Buffel (1)

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