. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CELL DIVISION IN GASTRIC MUCOSA is established in both environmental groups between the hours of 6:30 and 8:30 The most striking difference in the two animal groups is in the magnitude of the mitotic rates. The over-all mean mitotic rate in the gastric mucosa of the pond animals is approximately 8 times that of the laboratory animals (see Table I; compare two graphs of Figure 3). 10 - 9 in o o ^> 7 hi M O = 6 x Ul o 5 4 O P t 3 2 < 2 id z. 6789 10 II 12 123456789 10 II 12 I 23456 AM PM AM I POND LAB HOUR OF D
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CELL DIVISION IN GASTRIC MUCOSA is established in both environmental groups between the hours of 6:30 and 8:30 The most striking difference in the two animal groups is in the magnitude of the mitotic rates. The over-all mean mitotic rate in the gastric mucosa of the pond animals is approximately 8 times that of the laboratory animals (see Table I; compare two graphs of Figure 3). 10 - 9 in o o ^> 7 hi M O = 6 x Ul o 5 4 O P t 3 2 < 2 id z. 6789 10 II 12 123456789 10 II 12 I 23456 AM PM AM I POND LAB HOUR OF DAY FIGURE 3. Mean indices of mucosal mitotic rate of laboratory and pond animals plotted on the same scale. DISCUSSION It is not the intent of this report to review the rapidly accumulating literature dealing with the cyclic nature of the rate of mitosis in various tissues or on the periodicity observed in many other biological processes. Brief summaries or reviews of some of the pertinent investigations in this field have been made by Scheving (1959), Leedale (1959) and Marker (1958). Here, we will discuss only the significance and implications of our results and relate and compare these results to those obtained in a similar investigation of the mitotic rate in urodele larval epidermis (Scheving ct a I., 1959). The results of this investigation, first of all, clearly demonstrate that the mitotic rate of the gastric mucosal epithelium is cyclic in character with occurrence of typical peaks and lows in the rate of cellular division during the 24-hour 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, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alf
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