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  • Küçük Resim
    Öğe
    Distribution and location of endocrine cells in the pancreas of the sparrowhawk, accipiter nisus
    (2014) Kara, Adem; Tekiner, Deniz; Şimşek, Nejdet; Balkaya, Hülya; Özüdoğru, Zekeriya
    Bu çalışmada, atmaca pankreasının dorsal, ventral ve splenik loblarında bulunan endokrin hücrelerin dağılımı immun- histokimysal metotlarla belirlenmiştir. Pankreas dokusu anti-glukagon, anti-insulin, anti-gastrin ve anti-somatostatin primer antikorları kullanılarak streptavidin-biotin peroxidase metodu ile boyandı. Çalışmada, glukagon (alfa hücresi), insülin (beta hücresi) ve somatostatin (delta hücresi) salgılayan hücrelerin splenik lobda sayısının en fazla olduğu saptandı. Atmalarda pankreasın endokrin bölümlerinin alfa, beta ve miks adacıklar halinde gruplaştıkları saptandı. Beta adacıklarının çok sayıda beta hücresi, az sayıda deltaalfa hücrelerini içerdiği belirlendi. Alfa adacıkları, genellikle alfa ve delta hücrelerinden nadiren de beta hücrelerinden oluşuyordu. Ayrıca, gastrin pozitif hücreler, sadece ekzokrin pankreasta 1 ya da 2-3 adet hücre grubu halinde bulunurken, seratonin pozitif hücrelere ise ekzokrin ve endokrin pankreasın herhangi bir bölümünde rastlanmadı. Sonuç olarak, atmaca pankreasının lop sayısı, endokrin adacık tipleri ve endokrin hücre lokalizasyonu açısından etçil kuşlarla benzerliği, evcil kuş türleriyle de farklılıkları belirlenmiştir.
  • Küçük Resim
    Öğe
    The Effect of Fiberboard Modification on Adhesion Strength to Polyvinyl Chloride (PVC) Sheets or Eastern Beech (Fagus orientalis L.) Veneers
    (North Carolina State Univ Dept Wood & Paper Sci, 2018) Kara, Adem; Budakci, Mehmet; Camlibel, Osman
    The adhesion strength was evaluated for polyvinyl chloride (PVC) and Eastern beech (Fagus orientalis L.) veneers glued onto specially produced fiberboards using urea-formaldehyde (UF), polyvinyl acetate (PVAc), and polyurethane (PU) adhesives. Inorganic fillers including rock salt (NaCI), calcite (CaCO3), borax pentahydrate (Na(2)B(4)4O(7)center dot 5H(2)O), or talc (3MgO center dot 4SiO(2)center dot H2O) were incorporated into the fiberboards at levels of 3%, 6%, and 9%. The adhesion strength of the samples was determined in accordance to Turkish Standard TS EN 311 (2005). Scanning electron microscopy (SEM) was employed to determine the structural morphology at the bonding interface of the veneers and the modified fiberboards. The results of this study indicated that veneer adhesion strength was reduced by the addition of inorganic fillers to the fiberboard. The highest adhesion strength was obtained with Eastern beech veneer that was glued using UF adhesive on the control samples without inorganic fillers. It was concluded that UF and PVAc adhesives are not suitable for bonding PVC veneers onto fiberboard surfaces.
  • Küçük Resim
    Öğe
    Immunohistochemical distribution of glucagon -, insulin -, somatostatin -, gastrin-, and serotonin-containing cells in the pancreas of the Van cat
    (2014) Karaca, Turan; Kara, Adem; Şimşek, Nejdet; Uslu, Sema; Tekiner, Deniz; Yörük, Mecit
    The regional distribution, relative frequency, and appearance of glucagon (A-cell)-, insulin (B-cell)-, somatostatin (D-cell)-, gastrin (G-cell)-, and serotonin (EC-cell)-secreting cells in the endocrine and exocrine pancreas of Van cats were examined using the immunohistochemistry method. Glucagon immunopositive A-cells were principally found in the central region of the islets of Langerhans, while insulin immunopositive B-cells were located in the periphery of the pancreatic islets. Moreover, several A- and B-cells were observed as only single cells or clusters of 2 to 3 immunopositive cells in the exocrine parenchyma and the pancreatic duct epithelium. Somatostatin and gastrin immunopositive reactivities were negligible in the peripheral regions of the pancreatic islets of Langerhans and in the exocrine parenchyma. However, serotonin-immunopositive EC-cells were observed in neither the endocrine islets nor any other sites of the tissue. The existence, regional distribution, and relative frequency of A-, B-, D-, G- and EC-cells in the pancreas of Van cats have been analyzed in this study for the frst time. The immunopositivity and distribution of endocrine cells in the Van cat pancreas were determined to be partially diferent from those of other carnivorous species such as dogs and other cats.