. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OXYGEN CONSUMPTION CH^TOPTERUS EGGS 95 In this graph, the rate of oxygen consumption has been plotted against time, the initial respiration of the unfertilized eggs being considered as 100 per cent. The individual points on the curves represent average values obtained from 14 experiments. Rate of 00 consum-pttoa **•% 200r -150 -100 50 u,. •i 204507 Hours. FIG. 1. Oxygen consumption of Chxtoptems eggs during the seven hours fol- lowing activation and fertilization. Ordinates: rate of oxygen consumption; ab- scissae, hours. Th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OXYGEN CONSUMPTION CH^TOPTERUS EGGS 95 In this graph, the rate of oxygen consumption has been plotted against time, the initial respiration of the unfertilized eggs being considered as 100 per cent. The individual points on the curves represent average values obtained from 14 experiments. Rate of 00 consum-pttoa **•% 200r -150 -100 50 u,. •i 204507 Hours. FIG. 1. Oxygen consumption of Chxtoptems eggs during the seven hours fol- lowing activation and fertilization. Ordinates: rate of oxygen consumption; ab- scissae, hours. The curve F represents the oxygen consumption of fertilized eggs; the curve KC1 represents that of eggs treated with KC1; and the circles, u, represent that for unfertilized eggs. It is easy to see that, as stated before, the oxygen consumption of the unfertilized eggs (indicated by large circles) remains constant throughout the whole experimental period. It is evident too that respiration increases after the drop in oxygen consumption occurring after fertilization or activation, but obviously this increase is much stronger and faster in the case of the fertilized eggs than it is for the activated eggs: the fertilized eggs reach the initial level after 3y£ hours, at an early blastula stage. The respiration rate increases steadily later on and is almost 80 per cent higher at the end of the experiment than the oxygen uptake of the unfertilized eggs. On the other hand, the activated eggs differentiating without cleavage reach the initial rate only after 6 hours instead of 3>^. The fact that the same dif- ference in the respiration of two sets of eggs was found regularly in all the experiments indicates beyond doubt that the observed fact is really significant. It was possible that the difference might be linked to a depressive effect on the metabolism of the added KC1 which was present during the whole experiment. In order to check this possibility, 4 series of. Please
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
