By Professor Dr. August Epple, Professor Dr. Jack E. Brinn (auth.)
As a ways as we're acutely aware, this can be the 1st try and conceal the com parative body structure of the pancreatic islets in a monograph. the subjects mentioned may most likely have sufficed to fill approximately part a dozen monographs, a question that turns into noticeable from a glance on the Contents. therefore, we have now attempted to offer the ma terial extra within the kind of a digest, to stress evolutionary views, to show serious matters, and to spot hard subject matters for destiny study. This method required an arbitrary relief of the num ber of references, and we as a result subscribe to the refrain of contemporary authors who beg their colleagues for realizing if a few of their guides don't seem within the bibliography. maintaining with the present literature used to be like battling a type of monsters that develop a number of new heads for every one who is bring to an end. however, we are hoping that we've got lined lots of the key courses as much as the fall of 1986. We gratefully recognize the recommendation of many colleagues, and particularly the helpful criticisms of Robert L. Hazelwood and Erika Plisetskaya. distinctive thank you are because of the sequence editor, Donald S. Farner, for his endurance and tips, either one of which have been clean facts of his mythical diplomatic abilities. eventually, we want to thank Dr. D. Czeschlik and his employees on the Springer Verlag for his or her endurance and help. Philadelphia, PA AUGUST EpPLE Greenville, NC JACK E. BRINN September 1987 v Contents bankruptcy 1. advent .......................... .
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Extra resources for The Comparative Physiology of the Pancreatic Islets
Example text
Sekine and Yui (1981), who applied four antisera in a ray (Dasyatis akajel), found, in addition to the expected islet cell types (A, B-, D- and F-cells), a population of cells with immunoreactivity to both somatostatin and PP. In a species of shark (Squalus acanthias), EI-Salhy (1984) identified immunocytologically five different islet cells with antisera to glucagon, insulin, somatostatin, PP, and GIP. The holocephalians have four major islet cells (A-, B-, D- and X-cells), in addition to smaller numbers of pancreatic PP, GIP and enkephalin cells (Falkmer et al.
By light microscopy, White and Harrop (1975) studied the islets of four marsupials, the red kangaroo (Macropus rufus), the gray kangaroo (Macropus major), the euro (Macropus robustus), and the brush-tailed possum (Trichosurus vulpecula). Their methods allowed them to only distinguish B-cells and non-B-cells accurately, but interestingly, the kangaroos had B-cell populations of only 8-150/0 of the islet whereas that of the possum had 53% B-cells. In a recent immunohistologic study on Trichosurus vulpecula, Reddy et al.
As shown by Siwe (1926) (see also Figs. 4 to 7 in Bargmann 1939), this situation seems to be reflected in the first stages of development of the pancreas of many gnathostomes. According to Siwe (1926), the growing dorsal anlage often carries a large, compact accumulation of islet tissue away from the intestine; the degree of subsequent mingling of the two types of pancreatic tissues determines the extent to which islet 26 A Fig. 1. Development of dorsal anlage-derived pancreas tissues in different vertebrates.