. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 140 CHARLES G. KURLAND AND HOWARD A. SCHNEIDERMAN the respiration or at least the gas uptake of pupae whose basal oxygen consumption was less than 15 live We have duplicated these results in numer- ous experiments with Cynthia, Polyphemus and Promethea pupae. In all cases the apparent stimulation was greatest for pupae with low basal respiratory rates and possible explanations for this phenomenon will be offered in the Discussion. But soo r z jl 400 cr Q. Itl E 300 20O o o too 120 r < 100 O O 00 80. 60 S
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 140 CHARLES G. KURLAND AND HOWARD A. SCHNEIDERMAN the respiration or at least the gas uptake of pupae whose basal oxygen consumption was less than 15 live We have duplicated these results in numer- ous experiments with Cynthia, Polyphemus and Promethea pupae. In all cases the apparent stimulation was greatest for pupae with low basal respiratory rates and possible explanations for this phenomenon will be offered in the Discussion. But soo r z jl 400 cr Q. Itl E 300 20O o o too 120 r < 100 O O 00 80. 60 S 40 13 in o o c? 20 CO '/. CO-INSENSITIVE RESPIRATION C > 60 £ UJ <rt Z I 50 o 5432 02 TENSION AS 7. OF I ATMOSPHERE FIGURE 1 (left). The CO-insensitivity of pupal respiration as a function of basal O2 con- sumption. CO/Os ratio = 19:1. The oxygen tension was 5% in both CO and N2 mixtures. The gas exchange of 18 diapausing Cynthia pupae was measured first in the N2 mixture and then in the CO mixture. The per cent of CO-insensitive respiration is plotted against the respiration in the N2 mixture. FIGURE 2 (right). The CO-sensitivity of pupal respiration at reduced O2 tensions. The average O2 consumption of four brainless Promethea pupae whose average O» consumption in air was 33 live is recorded at each successive O2 tension in the O2-N? mix- tures. Similarly the average O2 consumption of five other pupae, whose average O2 consumption in air was 27 live , is recorded at each O2 tension in the O2-CO-N2 mix- tures. The rate of respiration in each gas mixture is expressed as per cent of basal rate in air. The CO/Oa ratio was kept constant at 19:1 by adding appropriate amounts of N2 to the O2-CO mixture. The right-hand vertical axis records the per cent of CO-insensitive respiration. Oxygen consumption decreased at tensions below 2% and this so complicated measurements of CO inhibition that values for O2 tensions below 2% could not be calculat
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