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Fig. 4. CO2 emission (at 37°C) by batches of Manduca sexta eggs either 1.5 d (A and B) or 3 day old (C and D). Each batch contained 210–450 eggs. Eggs were exposed, in series, to either 21 or 9.5% O2 with either He or N2 making up the balance. Only variation in O2 availability affected metabolic rates; swapping carrier gases (which altered the diffusion coefficient of O2 in the air filled parts of the chorion and trabecular layer) had no effect.





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