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Öğe Effect of synthetic juvenile hormone C-16 on the adult diapause in Anacridium aegyptium L. [Anacridium aegyptium L. (Orthoptera: Acrididae)'da sentetik juvenil hormon c-16'nin ergin diyapoz üzerine etkisi](1999) Ergen G.; Er E.In this study, two different concentrations (10.000 ppm, 15.000 ppm) of synthetic juvenile hormone (SJH) C-16 were topically applied to the diapausing adults of Anacridium aegyptium L. (Orthoptera: Acrididae). The treatment of SJH at two concentrations induced yolk deposition and terminal oocytes growth. The findings showed that development of the eggs was directly proportional with the concentrations of SJH. Concentration of 15.000 ppm was found more effective than 10.000 ppm. Therefore, we have concluded that (SJH) C-16 can terminate adult reproductive diapause in A. aegyptium.Öğe The effects of crude oil on skin histology of Poecilia sphenops (Valenciennes, 1846) (Cyprinidae, Teleostei) [Ham petrolün Poecilia sphenops (Valenciennes, 1846) (Cyprinidae, Teleostei) deri histolojisi üzerine etkileri](2012) Önen Ö.; Gökçe B.; Ergen G.; Işisag Üçüncü S.As being the main energy source that is needed for all of the industrial processes, crude oil is evaluated as a widely investigated ecotoxicant. In order to identify the effects of crude oil on the skin of teleosts, Poecilia sphenops specimens were exposed to three different concentration of soluble part of crude oil (10%, 20%, 40%) at four different exposure time (24, 48, 72, 96 h); and the histopathological changes were reported. A slight epidermis corrosion and melanophore aggregation in dermis were observed at low concentration and short exposure time. As estimated, the striking effects of the crude oil; such as dermis disintegration, necrotic areas and fibrosis in subcutaneous muscle layer; were extended prominently in parallel with increasing concentrations and exposure time.Öğe The effects of dioctyl adipate (DOA) on the gill histology of labidochromis caeruleus fryer, 1956 (Cichlidae, Teleostei) [dioktil adipat'i{dotless}n (doa) labidochromis caeruleus'un fryer, 1956 (Cichlidae, Teleostei) solungaç histolojisi üzerine etkileri](2010) Işisag Üçüncü S.; Önen O.; Ergen G.; Üreten M.; Boz E.; Seferoglu K.; Gökçe B.Although it is used widely as a second plasticizer in processing polyvinyl and other polymers, the data about the ecotoxicological effects of dioctyl adipate (DOA) is limited. In order to investigate the primer effects of short term sublethal exposure to DOA on the gills of Labidochromis caeruleus (yellow princess), the specimens were divided into three groups included two control and one experimental group. After a period of 30-days, the tissues were removed for histological examination. When compared to the untreated and 2.5 ppm acetone exposed controls, the gills of the experimental animals that exposed to 0.75 ppm DOA showed remarkable histopathological changes distinguished as hypertropy, severe hyperplasia, aneurysma, oedema, epithelial lifting, and striking fusion. The results indicate that DOA would have to take into more consideration as an ecotoxicant.Öğe The Effects of dioctyl adipate (DOA) on the liver histology of Labidochromis caeruleus Fryer, 1956 (Cichlidae, Teleostei) [Dioktil adipat'i{dotless}n (doa) Labidochromis caeruleus Fryer, 1956 (Cichlidae, Teleostei) karaciger histolojisi üzerindeki etkileri](2010) Işisag Üçüncü S.; Ergen G.; Önen O.; Kolbaşi Tekken B.; Üreten M.; Boz E.; Seferoglu K.; Gökçe B.Although dioctyl adipate (DOA, C22H42O4) is one of the most common plasticizers that are used for polymerization, the ecotoxicological effects of it is not well known. From this point of view, aim of this preliminary investigation was to analyze the histopathological changes in the liver of Labidochromis caeruleus (yellow princess), exposed to 0.75 ppm DOA for 30 days. When compared to controls, the most prominent changes occurred in the DOA exposed group were noted as a significant steatosis (fat deposisiton), fibrosis and expanding necrotic areas. The dilatation of sinusoids and central veins, poikilocytosis, and hemorrhage were also observed. The data presented in this study shows that, DOA is a hepatotoxic chemical at least for Labidocromis caerulous.Öğe External egg morphology of Melanogryllus desertus (Pallas, 1771) (Orthoptera: Gryllidae)(2012) Çakici Ö.; Ergen G.External egg morphology of Melanogryllus desertus was studied with both light and scanning electron microscopy. Culture of this species was made at 26 ±2°C and 45±5% relative humidity in laboratory conditions. Mature female crickets laid eggs singly on cotton and they are carefully separated from each other. Eggs of M. desertus are yellow and thin-long shaped. While anterior end has sharp tip, posterior end is rounded. There was a micropylar opening in the anterior end. The surface of the egg is smooth, but posterior end bears small chorionic protrusions. © Biharean Biologist, Oradea, Romania, 2012.Öğe Histologic description of midgut in Melanogryllus desertus (Pallas, 1771) (Orthoptera: Gryllidae)(2012) Çakici Ö.; Ergen G.In this work, histologic structure of midgut of Melanogryllus desertus was investigated for the first time and some scanning electron microscope photographs were also presented. Two big and large gastric caeca anterolaterally surrounded the midgut. There were microvilli on the surface of columnar epithelial cells arranged as a single layer by forming foldings in the gastric caeca. Gastric glands consisted of cubic epithelial cells arranged as single layer were encircled by connective tissue. Because of the activities of epithelial cells, many secretory granules with different size were observed. There was a peritrophic membrane encircling food in the lumen of midgut. Cells in the basal portion of midgut were clustered and called nidi. Longitudinal and circle muscle layer encircled midgut, respectively. Pyloric valve was located at junction of midgut and hindgut. © Biharean Biologist, Oradea, Romania, 2012.Öğe Immunohistochemical and histopathological evaluation of 2,4-dichlorophenoxyacetic acid-induced changes in rat kidney cortex(2009) Uyanikgil Y.; Ateş U.; Baka M.; Biçer S.; Öztaş E.; Ergen G.This study aims to investigate the effect of 2,4-dichlorophenoxyacetic acid (2,4-D) on rat kidney cortex histology. Oral exposure of rats to 2,4-D for 28 days resulted in decreases in body weight gain and kidney weight. Histological examination showed degeneration in renal corpuscles and podocytes; vacuolization in the glomerulus with disintegration of the basal membrane; tissue edema; vacuolization, cystic dilation and invagination of the basal laminae in the tubular structures; dilation and congestion in renal corpuscular vessels and marked decrease in glomerular and stromal fibronectin reaction; suggesting that subacute 2,4-D administration induces dose-dependent histopathological degenerative effects in rat kidney cortex. © 2009 Springer Science+Business Media, LLC.Öğe Morphometric variations of the rumen ciliate, Ophryoscolex purkynjei Stein, 1858 (Ciliophora: Entodiniomorphida) from cypriot domestic goats [Kibris evcil keçilerinde yaşayan işkembe siliyati Ophryoscolex purkynjei Stein, 1858 (Ciliophora: Entodiniomorphida)'de morfometrik varyasyonlar.](2006) Mermer A.; Göçmen B.; Ciçek K.; Ergen G.; Sezgin Y.; Yildiz M.Z.The species Ophryoscolex purkynjei and its four formae [O. p. f. purkynjei, O. p. f. bifidobicinctus, O. p. f. bicoronatus and O. p. f. tricoronatus] from the Cypriot domestic goats (Capra hircus) have been investigated from the viewpoint of the diagnostic morphometrical characteristics. Moreover, it was demonstrated that there was significant morphometrical variations among the same formae in different host animals. As the result of our investigation, it has been suggested that all of the morphometrical variations determined may originate from the individual physiological differences of the host animals (e.g. the other ciliate fauna, bacterial population, inter-specific antagonism etc.).Öğe On the nereididae (polychaeta: Annelida) fauna of the bay of İzmir(2000) Ergen Z.; Çinar M.E.; Ergen G.This study, dealing with the taxonomic features of Nereididae species, was conducted at 7 stations located in İzmir Bay and its adjacent areas. The benthic samples examined yielded 7 genera and 15 species; of these Micronereis variegata Claparède, 1863 is recorded for the first time in Turkish waters. The morphological characteristics of the specimens collected in various biotopes are discussed and a taxonomic key to the species is provided. © Max Kasparek Verlag, Heidelberg.
