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Fig. 6. Representative profile of radial oxygen partial pressure in an egg of
Manduca sexta. The initial reading is from still water (temperature
equilibrated and air saturated). The first arrow indicates electrode
withdrawal into air, and the second indicates electrode penetration to just
below the chorion. Each subsequent plateau represents a 100 µm increment,
advancing past the central minimum PO2. The
third arrow indicates where the electrode was withdrawn back into air and
immediately placed back into still water. Inset: Stirring effect. The asterisk
indicates when the air bubbles were turned off. All electrode calibration was
done in still water after bubbles were turned off.
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