. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 92 J. R. COOK of growth rate, plotted for both E. gracilis var. bacillaris and strain Z. The data for protein are quite comparable (cj. Fig. 2) but are not shown in Figure 6 for purposes of clarity. Mass and RNA levels in Euglena are a negative exponential function of the growth rate when the latter is .05/hr. or less, and a positive function at higher growth rates. In this respect it is noted that the growth rates of S. typhiniurium as studied by Schaechter et al. (1958) were always considerably greater than those reported
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 92 J. R. COOK of growth rate, plotted for both E. gracilis var. bacillaris and strain Z. The data for protein are quite comparable (cj. Fig. 2) but are not shown in Figure 6 for purposes of clarity. Mass and RNA levels in Euglena are a negative exponential function of the growth rate when the latter is .05/hr. or less, and a positive function at higher growth rates. In this respect it is noted that the growth rates of S. typhiniurium as studied by Schaechter et al. (1958) were always considerably greater than those reported here for Euglena. It is of interest to note that a single line satisfies the RNA content as a function of growth rate for both varieties of E. gracilis. In spite of the fact that strain Z 15 10 0 l_ a. ' 15' RNA 20 25 FIGURE 7. Relationship between the rates of RNA and protein synthesis in E. gracilis strain Z (filled circles) and var. bacillaris (open circles) at various temperatures as indicated. Rates in and var. bacillaris can hold widely different values for RNA content and growth rate at a given temperature (cf. Figs. 1 and 2), the conformity shown in Figure 6 suggests that genetic differences in the two strains are not yet great enough to be expressed as some divergence in the fundamental relationships between division and synthesis. This view is strengthened by the comparison shown in Figure 7, which is a plot of the rate of RNA synthesis against the rate of protein synthesis for the two strains, when these rates are varied by temperature. Again, a single line satisfies both sets of data. The rate of information translation is the same in both cell lines, at least at a very gross level. By exclusion, it is inferred that the two strains may differ principally in the rate of information transcription. While DNA levels were not followed in the present study, it can safely be assumed that. Please note that these images are extracted from scanned
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
