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You are investigating the release kinetics of insulin-loaded microspheres. a polymeric sphere of radius 0.2cm containing a 0.1 mg/ml insulin is placed in a volume of buffer that is large enough so that the insulin concentration in the buffer at all times can be considered zero. the beaker is well mixed such that a surface concentration of zero can be assumed. the insulin diffusion coefficient in the microsphere is 5x10-8 cm2/s. determine the time required for the insulin concentration 0.1cm from the center of the sphere to equal 20% of the initial concentration.
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