Yazar "Cengiz, Elif I." seçeneğine göre listele

Listeleniyor 1 - 4 / 4
  • [ X ]
    Öğe
    The effects of fenvalerate on different tissues of freshwater fish Cirrhinus mrigala
    (Taylor & Francis Inc, 2007) Velmurugan, Babu; Selvanayagam, Mariadoss; Cengiz, Elif I.; Unlu, Erhan
    The histopathological changes of fenvalerate on the gill, kidney, liver and intestine tissues of the Cirrhinus mrigala were determined by light microscopy. The fish were exposed to two sub-lethal concentrations of fenvalerate (1.5-3.0 ppb). The most common gill changes at all concentrations of fenvalerate were epithelial hyperplasia, epithelial necrosis, desquamation and lamellar fusion. Besides, epithelial lifting, oedema, swelling at the tips of secondary lamellae and curling of secondary lamellae were other histopathological changes. Necrosis of tubular epithelium, pycnotic nuclei in the hematopoietic tissue, hypertrophied epithelial cells of renal tubules, narrowing of the tubular lumen, expansion of space inside the Bowman's capsule and contraction of the glomerulus were observed in kidney tissues of fish. Hepatic lesions in the liver tissues of fish exposed to fenvalerate were characterized by congestion, cloudy swelling of hepatocytes and focal necrosis. Atrophy of epithelial cells, necrosis of epithelial cells, desquamation of mucosal epithelium and infiltration of lymphocytes into the lamina propria, were detected in intestine tissues of fish after exposure to fenvalerate.
  • Küçük Resim
    Öğe
    Histopathological effects in tissues of snail Lymnaea stagnalis (Gastropoda, Pulmonata) exposed to subletha concentration of Thiodan® and recovery after exposure
    (John Wiley & Sons Ltd, 2005) Ünlü, Erhan; Cengiz, Elif I.; Yıldırım, Mehmet Z.; Otludil, Birgül; Ünver, Özkan; 0000-0001-5453-6140; 0000-0002-6752-498X
    Histopathological alterations induced by Thiodan (R) in three tissues, namely, digestive gland, foot and mantle, of the freshwater snail Lymnaea stagnalis were investigated. Specimens of Lymnaea stagnalis were exposed to 0.36% and 0.72% Thiodan (R) 35 EC, a commercial grade of endosulfan, for 96 h followed by a recovery period of 30 days. Thiodan (R) caused significant dose dependent histopathological changes in all the tissues of the snail. Irreversible necrotic changes occurred in the digestive gland of the snail following Thiodan (R) exposure. Degenerative changes in the muscle fiber of the foot, protein and pigment cells of the foot and the connective tissue element of the mantle were recovered after 30 days of recovery of the snail in pesticide-free freshwater. Copyright (c) 2005 John Wiley & Sons, Ltd.
  • Küçük Resim
    Öğe
    Histopathological effects of Thiodan® on the freshwater snail, Galba truncatula (Gastropoda, Pulmonata)
    (John Wiley & Sons Ltd, 2005) Cengiz, Elif I.; Yıldırım, Mehmet Z.; Otludil, Birgül; Ünlü, Erhan
    Histopathological alterations in three tissues, namely, digestive gland, foot and mantle of the freshwater snail Galba truncatula induced by Thiodan (R) 35 EC, a commercial preparation of endosulfan, were studied in the laboratory. The snails were exposed to five sublethal concentrations of Thiodan (R), two of them higher concentrations at 0.33% and 0.65% in glass jars for short-term exposure (96 h) and three of them lower concentrations at 0.08%, 0.16% and 0.27% for long-term exposure (10, 20 and 30 days). Thiodan (R) caused significant histopathological changes in the tissues of the snail, irrespective of the concentration of the pesticide and its exposure period. The histopathological changes included accumulation of amoebocytes in the hemolymphatic spaces between the tubules of the digestive gland, exudation in the lumen of tubules, expansion of hemolymphatic spaces between the tubules and increase of vacuolation and necrotic changes in the digestive cells. Disruption of columnar muscle fibers and alteration of epithelial layers were detected in the foot and mantle of the treated specimens. The number and size of mucous and protein cells in the foot and mantle also changed.
  • Küçük Resim
    Öğe
    Levels of transaminases, alkaline phosphatase, and protein in tissues of clarias gariepienus fingerlings exposed to sublethal concentrations of cadmium chloride
    (Wiley, 2008) Velmurugan, Babu; Selvanayagam, Mariadoss; Cengiz, Elif I.; Uysal, Ersin
    The freshwater fish, Clarias gariepienus fingerlings, were exposed to sublethal concentrations (1.7 and 3.4 mg/L) of cadmium chloride for 12 days. Aspartate aminotransferase (AAT), alanine aminotransferase (ALT), alkaline phosphatase (ALP), and total protein levels were assayed in the gill, brain, and muscle of the fish at regular intervals of 6 and 12 days. The activities of AAT, ALT, and ALP of the treated fishes increased significantly in all the tissues compared with the control fish. Protein level in all the tissues showed a significant decrease in comparison to unexposed controls throughout the experimental periods. These results revealed that cadmium chloride effects the intermediary metabolism of C. gariepienus fingerlings and that the assayed enzymes can work as good biomarkers of contamination. (C) 2008 Wiley Periodicals, Inc. Environ Toxicol 23: 672-678, 2008.