Abstract
1. 1. The permeability characteristics of the Malpighian tubules of Musca domestica have been determined by measuring tubule fluid: bathing medium ratios for d-, l- and CH 3-glueose, inulin. dextrans and polyethylene glycols. 2. 2. Molecules cross the epithelium in inverse relation to their molecular size, although the permeability to polyethylene glycols is independent of molecular chain length. 3. 3. No correlation between tubule fluid: bathing medium ratio and rates of fluid secretion is observed with CH 3-glueose and polyethylene glycols, but an inverse relationship does exist for inulin and dextrans indicating a molecular sieving effect for these molecules. 4. 4. The results are interpreted in terms of fluid flow occurring via the intercellular spaces with filtration across the tubule epithelium being linked with potassium secretion.
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