. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RACIAL DIFFERENCES IN CONJUGATION 279 that conjugation docs not have the same effect on mean fission rate in all clones: in some clones, conjugation raised very slightly the mean fission rate (rejuvenescence) ; in other clones, it lowered the mean fis- sion rate (depression) ; and in other clones it left the mean fission rate unaltered. It appears here again that ihe effect of conjugation on mean fission rate depends on tlie nature of tJic clone which conjugates. The ratios of the standard deviations in the ex-conjugants to
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RACIAL DIFFERENCES IN CONJUGATION 279 that conjugation docs not have the same effect on mean fission rate in all clones: in some clones, conjugation raised very slightly the mean fission rate (rejuvenescence) ; in other clones, it lowered the mean fis- sion rate (depression) ; and in other clones it left the mean fission rate unaltered. It appears here again that ihe effect of conjugation on mean fission rate depends on tlie nature of tJic clone which conjugates. The ratios of the standard deviations in the ex-conjugants to those in the non-con jugants (Table IX) show a number of consistent differ- ences, but most of them are slight. In £40a the ratio is lower than in £85/>. FA\a, E46b, ESQb: in ES\a it is lower than in ES5b and E4la; and in E46b it is lower than in E4\a. The greatest consistent differ- ence in ratio is between E40a and E4la. The ratios for the former are and , for the two different periods; for the latter the corre- sponding ratios are and Thus conjugation increased ab- solute variability of fission rate about twice as much in the clone E4la as in the clone E40a. TABLE X Comparison of clone E40a -with clone E4la in differences between non-conjugants and ex-conjugants in standard deviation and coefficient of variation of total number of fissions. Jan. 16-20 Jan. 21-25 Difference between non-conjugants and ex-conjugants in Standard Deviations Clone E40a ± ± Difference between non-conjugants and ex-conjugants in Coefficients of Variation Clone E41a Clone £40a ± ± ± ± Clone £81a ± ± The ratios of the coefficients of variation of the ex-conjugants to those of the non-conjugants (also in Table IX) show differences simi- lar to the differences in the ratios of the standard deviations. E4Qa is consistently lowest, with ratios of and ; E4la is among the highest, with
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
