. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CELL DIVISION IN GASTRIC MUCOSA made by computing the standard error of the differences between two means and the consequent probability. RESULTS The mean mitotic indices of the gastric mucosal epithelium for each of the 12 time periods over a 24-hour day and for both animal groups are listed in Table I. \Yhen these indices are plotted in a graph (Figs. 1, 2), it is obvious that the mucosal mitotic activity of both the laboratory and pond animals is characteristically cvclic in nature. u o 0 o X M iii co O !: z 1
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CELL DIVISION IN GASTRIC MUCOSA made by computing the standard error of the differences between two means and the consequent probability. RESULTS The mean mitotic indices of the gastric mucosal epithelium for each of the 12 time periods over a 24-hour day and for both animal groups are listed in Table I. \Yhen these indices are plotted in a graph (Figs. 1, 2), it is obvious that the mucosal mitotic activity of both the laboratory and pond animals is characteristically cvclic in nature. u o 0 o X M iii co O !: z x Id O z u l_ o ' 5 z 111 2 ! 719 10 11 12 123456789 10 II 12 123456 AM PM AM HOUR OF DAY FIGURE 1. Mean indices, at two-hour intervals over a 24-hour period, for mitotic rate of gastric mucosal epithelium of laboratory animals. In the laboratory animals the peak hour of activity is at 10 :30 , at which time the mean mitotic index is ± (Table I; Fig. 1). Following this peak, a gradual decrease in the number of dividing cells is recorded until 4 :30 , when the daily over-all mean mitotic index of ± is approached. Sub- sequently, there is a relatively rapid decrease in mitotic activity and the mitotic indices are belowr the 24-hour mean index during a seemingly stable period from 6 :30 through 6 :30 , with the exception of a minor increase at 2 :30 The mitotic index of the 10 :30 peak was compared with the over-all mean mitotic rate and the difference was found to be statistically significant ( < p <). When the 10:30 peak index was compared to the 6:30 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-
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
