Concentration Fields and Mechanical Forces in Metabolizing Systems

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Abstract
Some diffusion problems arising in biophysics are discussed for simple two‐body cases. The steady state concentration field is determined, by a method of images, for cases of constant inflow over the surfaces of two external spheres, or two long parallel cylinders; both when the bodies are in an inactive environment, and when they are aligned with an external gradient. As an application, there is calculated the resultant force on each body arising from a normal surface pressure proportional to the concentration. The numerical value of these forces is of the same order of magnitude as that approximately estimated previously by N. Rashevsky.3