Abstract
1. 1. The concentrations of the major inorganic ions in the hemolymph of Periplaneta americana were determined as follows (in mM): Na +, 132; K +, 8.7; Mg 2+, 4.7; Ca 2+, 3.7; Cl −, 107; PO 3− 4, 1.04. 2. 2. By the method of ultrafiltration, significant binding to macromolecules in hemolymph was demonstrated for the following ions: Na +, 22.0%; Mg 2+, 25.5%; Ca 2+, 16.2%; C1 −, 10.3%; PO 3− 4, 26.9%. 3. 3. K + was not bound significantly to macromolecules in hemolymph.
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