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Articles by Ali Bayrakdar
Total Records ( 5 ) for Ali Bayrakdar
  Berrin Gencer Tarakcy , Mine Yaman and Ali Bayrakdar
  Insulin, glucagon and somatostatin immunoreactivity were found in ostrich pancreatic endocrine islet cells. Insulin immunoreactive cells were present in the central regions with high frequency. Glucagon immunoreactive cells were occurred in the peripheral regions with moderate frequency and a few of these cells were also demonstrated in the mantle regions. Somatostatin immunoreactive cells were detected in the mantle, peripheral and central regions with moderate frequency. In the exocrine pancreas, insulin, glucagon and somatostatin immunoreactivity were not detected. Gonadotropin Releasing Hormone (GnRH) immunoreactivity was not observed in the pancreatic endocrine and exocrine regions.
  Mine Yaman , Berrin Gencer Tarakci and Ali Bayrakdar
  The presence and distribution of some biologically active substances in nerve fibres supplying the mammary gland in the pregnant, lactating and non-lactating guinea pig were studied using immunohistochemical methods. The substances studied included: Calcitonon Gene Related Peptide (CGRP), substance P (SP), Vasoactive Intestinal Polypeptide (VIP), Galanin (GAL), Cholecystokinin (CCK) and neurotensin. Immunoreactive nerve fbres were associated with blood vessel, lactiferous ducts and alveoli. CGRP, SP, VIP, GAL, CCK and neurotensin immunoreactive fibres appeared to be much more numerous in the mammary gland of pregnant and lactating guinea pigs when compared to non-lactating guinea pigs. The results demonstrate a rich distribution of different types of nerve fibres in structures of mammary gland related to milk ejection. These nerve fibres may be involved in the local control of milk ejection.
  Berrin Gen?er Tarakci , Mine Yaman and Ali Bayrakdar
  In the present study, the existence of gonadotropin-releasing hormone (GnRH) was investigated in the quine pig pancreas and gastrointestinal tract by using immunohistochemical techniques. GnRH-immunoreactive cells were only detected in exocrine pancreas. No immunoreactivity was seen in pancreatic islets and also in any region of gastrointestinal tract. This is the first report suggesting the existance of GnRH in quine pig pancreas.
  Berrin Gencer Tarakci , Mine Yaman , hsan Yaman , Ali Bayrakdar and Tuba Parlak
  The presence of serotonin, calcitonin, somatostatin-14, cholecystokinin (CCK), calcitonin gene related peptide (CGRP) endocrine cells in the lung of the ostrich (Struthio camelus) was investigated by immunohistochemistry. CGRP and serotonin immunoreactivity were observed in the PNEC cell (pulmonary neuroendocrine cell) with intermediate and low frequencies, respectively. Somatostatin containing cells were scarcely observed. CCK and calcitonin were not detected. These results suggesting that CGRP, serotonin and somatostatin may be involved in the lung ontogeny.
  MineYaman , Berrin Gen?er Tarak? , Ali Bayrakdar and Hatice Orsay
  The regional distribution and relative frequency of endocrine cells was studied immuohistochemically in the gastrointestinal tract of the frog, Rana ridibunda, using antisera against serotonin, somatostatin-14, cholecystokinin and vasoactive intestinal polypeptide. These immunoreactive cells were located in the gastric glands of stomach and in the intestinal epithelium with variable frequencies. They were spherical or spindle shaped. The regional distributions and relative frequencies of the endocrine cells in the gastrointestinal tract of the Rana ridibunda were resembled to those of the other anuran species.
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