. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 314 MAURICE SUSSMAN AND HERBERT L. ENNIS incubated for one hour did not affect the background frequency but increases of 10 and 24% over background were obtained by adding R-cells pre-incubated for 4-6 and 10-12 hours, respectively. In other words, when pre-incubated for 10-12 hours and then moved to test areas, one out of four R-cells could induce the formation of a center among the test cells, 12 hours after its 0 2468 TIME IN HOURS 10 12 FIGURE 6. A kinetic comparison of: I. The capacity of small population
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 314 MAURICE SUSSMAN AND HERBERT L. ENNIS incubated for one hour did not affect the background frequency but increases of 10 and 24% over background were obtained by adding R-cells pre-incubated for 4-6 and 10-12 hours, respectively. In other words, when pre-incubated for 10-12 hours and then moved to test areas, one out of four R-cells could induce the formation of a center among the test cells, 12 hours after its 0 2468 TIME IN HOURS 10 12 FIGURE 6. A kinetic comparison of: I. The capacity of small population samples to ag- gregate when isolated from their neighbors after varying periods of incubation. Ordinate: per cent of 250 cell samples that aggregated. Abscissa: time of incubation on washed agar prior to isolation. (Data from Table I.) II. The capacity of R-cells incubated for varying times on washed agar to initiate centers amongst their developmental juniors. Ordinate: per cent of R-cells capable of initiation. Abscissa time of incubation on washed agar prior to their micromanipulation to test areas. (Data from Table II.) Figure 6 is a graphic comparison of the kinetics of induction of centers in test squares (I) by progressively delayed removal of outlying I-cells (data from Table I) and (II) by addition of pre-incubated R-cells (data from Table II). The crude ki- netic similarity suggested that the outlying I-cell might not only 'be responsible for the subsequent aggregation of the R-cells but also for the concomitant increase in their capacity to themselves initiate centers. To test this possibility, replicate samples. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie,
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
