Abstract
The hydrodynamic and osmotic permeabilities (for glucose) have been studied for the anterior bovine lens capsule. The filtration coefficient, Lp, was found to be 2·34±1·04×10−11 cc/sec/cm2/dyne for calf, and 1·15±0·34×10−11 for steer. On the other hand, the reflection coefficient, σ, for glucose was 0·0030±0·0019 for calf and 0·020±0·017 for steer. The effect of aging upon these respective coefficients suggests different pathways for water and glucose. No difference was observed in the σ value for d- and l-glucose. The thickness of the anterior capsule was found to be: 0·0048±0·0018 cm for calf as compared to 0·0085±0·0015 cm for steer. The filtration coefficient increases with the reciprocal of the thickness, but not in a linear fashion. This may be interpreted to mean that the anterior capsule does not grow by the accretion of homogenous and/or parallel layers. In general, the permeabilities of the reference substance to the capsule is comparable to many synthetic and biological membranes. An apparatus is described for the rapid determination of both hydrodynamic and osmotic permeabilities of biological membranes.
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