. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CORRELATION OF DNA AND RESPIRATION 415 plateau of the curves of Experiment 1 may be the result of starvation; the larvae do not develop further than the short-armed pluteus stage without feeding. These data indicate that in both experiments the respiration curves parallel the corresponding curves for DNA phosphorus. To help determine whether any re- lationship exists between the two phenomena, correlation coefficients were calcu- lated. The coefficient of correlation, r, for the combined data of both experiments, covering th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CORRELATION OF DNA AND RESPIRATION 415 plateau of the curves of Experiment 1 may be the result of starvation; the larvae do not develop further than the short-armed pluteus stage without feeding. These data indicate that in both experiments the respiration curves parallel the corresponding curves for DNA phosphorus. To help determine whether any re- lationship exists between the two phenomena, correlation coefficients were calcu- lated. The coefficient of correlation, r, for the combined data of both experiments, covering the developmental period from the 2-cell stage to the pluteus, with fourteen paired values of rates of oxygen consumption and amounts of DNA phosphorus, is This excludes the values for the unfertilized egg, which is assumed to be very different physiologically from the developing egg. The correlation coefficient en o o UJ 25 EXPT. I 02 O O DNA A A 02 •---• DNA A---A T. TIME AFTER FERTILI ZATI ON - HOURS FIGURE 1. Rate of oxygen consumption and DNA phosphorus content in the embryos of Strongylocentrotus purpuratus. Developmental stages: UF, unfertilized; 2C, two-cell; MB, middle blastula ; H, hatching ; EG, early gastrula ; EPR, early prism ; EPL, early pluteus ; SPL, short-armed pluteus. for the second experiment alone, for which the data are more complete with ten paired values, is These correlation coefficients are much higher than neces- sary to be significantly different from zero at the 1 % level. A scatter diagram with the regression lines for the two experiments is shown in Figure 2. In the unfertilized egg the rate of oxygen consumption, from the data of the first experiment, is microliters per hour per egg while the rate of microliters per hour per egg is the value predicted from the regression line y = + know- ing that the amount of DNA phosphorus is micrograms in the unfertilized egg. The observed value is not quite s
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
