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Measurement of water and carbon dioxide loss from insects using radioactive isotopes

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Figure

Fig. 1. (A) Schematic diagram of a single-channel flow-through apparatus. The apparatus comprises an air-drying tube filled with silica gel, aperistaltic pump, an aquarium pump, gas bottles containing saturated salt solution, a bleed valve, four-way valves, the insect chamber and a
Fig. 2. (A) Efflux rate constants (kimmediately after feeding on THO. Increasing 0) of water from a cockroachk0 with time indicatesequilibration of THO with body water over time
Fig. 3. (A) Simple model of exchange of CO2 with HCO3� in bodyfluids. (B) Model used to interpret 14C fluxes in insects, showing thecompartments used in the analysis and the rate constants that definethe fluxes between them.

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