. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 356 BERTIL HILLE AND ROGER MILKMAN r 10 8 6 4 2 13 min. °+39 12 min. 6 min. + ° ° + °. 10 20 30 40 50 Minutes at ° 60 70 80 °,°, 395' 23' 23' FIGURE 8. Response to ° immediately after exposure to indicated temperatures for indicated times. Slopes reflect temperature-dependence of D branch ratio. At lower tempera- ture more A goes to C' and less to F, so the rate of G production (slope) is smaller. Unpublished data, in part. See, also, Figure 6, Milkman and Hille (1966). response curv
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 356 BERTIL HILLE AND ROGER MILKMAN r 10 8 6 4 2 13 min. °+39 12 min. 6 min. + ° ° + °. 10 20 30 40 50 Minutes at ° 60 70 80 °,°, 395' 23' 23' FIGURE 8. Response to ° immediately after exposure to indicated temperatures for indicated times. Slopes reflect temperature-dependence of D branch ratio. At lower tempera- ture more A goes to C' and less to F, so the rate of G production (slope) is smaller. Unpublished data, in part. See, also, Figure 6, Milkman and Hille (1966). response curves at a single temperature will measure what fraction of the D actually proceeded to E. Figure 8 shows such an experiment. In our theory the D branch ratios at °, °, and ° are 27%, 40%, and 55%, respectively. The data show that the expected ratios of slopes 1:2 are obtained. E was previously shown (Milkman, 1963) to be a state which was protectable only by long intervals at temperatures below °. This is the last manifesta- tion of rapid temperature adaptation. The E —» F reaction is revealed by the disappearance of this mode of protection. Very few data are available, but the points on Figure 9 suggest that we have chosen an approximately correct time course. The dashed curve in the figure shows the consequence of removing the reaction which protects E (kED = 0). The difference between this line and the points shows the contribution of E-protection. The solid line is the expectation from the model as it stands. We must now determine QIEF- As with QIDE for the D branch ratio, QIEF governs the temperature dependence of the E branch ratio. If we take QIED, kED, and kEp at their postulated values and try three values: , , and for QIEF, we find that the E branch point ratios fall to 50% at °, °, and °, respectively. At present our choice is simply to have E-protection below °. G formation After 25 minutes at °
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
