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Öğe Evaluation of pyrethroid susceptibility in culex pipiens of Northern Izmir Province, Turkey(Tehran University of Medical Sciences, 2018) Guntay O.; Yikilmaz M.S.; Ozaydin H.; Izzetoglu S.; Suner A.Background: Mosquitoes, being a nuisance species, are considered as one of the most important species in public health control programs due to their role as a vector in mosquito-borne diseases observed in humans and animals. We evaluated the susceptibility status of Culex pipiens collected from northern Izmir, Turkey in 2011-16. Methods: Mosquito larvae, collected from three different locations in northern İzmir, were reared in the laboratory. Adult susceptibility bioassays were performed using the WHO insecticide-impregnated papers including deltamethrin 0.05%, permethrin 0.75%, ?-cypermethrin 0.05% and cyfluthrin 0.15%. In addition, adult bioassays were performed after the pre-exposure to piperonyl butoxide (PBO) to determine the contribution of P450 detoxification enzymes to the phenotypic resistance. Results: In all of the three populations, high levels of resistance were observed (mortalities<63%) to all of the four pyrethroids. Different pyrethroids but with the same mode of action can exhibit significantly different phenotypic resistance in a single population. PBO bioassays also showed that P450 detoxification enzymes can have diverse effects on different pyrethroids. Conclusion: Using just one chemical in a class of insecticide can be misleading for resistance studies. © 2018 Tehran University of Medical Sciences. All rights reserved.Öğe Primary insect cell culture from total embryo and embryonic brain tissue of Periplaneta americana: A preliminary study(Institut za Bioloska Istrazivanja, 2015) Soya S.; Can H.; Yikilmaz M.S.The aim of this preliminary study was to establish a primary insect cell culture from total embryos and embryonic brain tissues of Periplaneta americana, collected from Izmir, Turkey. Cells were cultured at 29°C in Grace's insect medium for one month. In the embryonic brain tissue culture, single cells and cell clumps containing spherical and ovoid as well as dividing cells were observed. Single bipolar neurons were detected after 4 days in culture. Network systems comprised of bipolar neurons were observed on the 5th day of incubation. In addition, presumably glia cells were observed in the embryonic brain culture. In the total embryo culture, the cell population exhibited variable morphologies, including spherical, spindle-like, polygonal and giant cells after nearly 20 days; the culture covered almost half of the Petri dish area within 30 days. This preliminary study associated with Periplaneta americana primary cell culture is the first of its kind in Turkey. These results should contribute to the development of new insect cell lines that are indigenous to Turkey.Öğe Reliability of intravitreal nepafenac in rabbits(Mary Ann Liebert Inc., 2015) Afrashi F.; Karatepe Hashas A.S.; Shahbazov C.; Arici M.; Yikilmaz M.S.; Deveci R.; Karacali S.; Sahar U.Purpose: The purpose of this experiment was to investigate the possible toxic effects of Nepafenac, a nonsteroidal anti-inflammatory molecule, after its intravitreal application in various concentrations. Methods: Forty pigmented rabbits were randomly divided into 4 groups, each including 10 rabbits. The active ingredient Nepafenac was prepared to be applied in different doses, for intravitreal use. Under topical anesthesia, following pupil dilatation, 0.3, 0.5, 0.75, and 1.5mg doses of Nepafenac was applied intravitreally into the right eye. In each rabbit, the right eye was considered to be the study group. Saline was injected intravitreally into the left eye of each rabbit, and these eyes were considered to be the control group. Immediately after the injection and at the 1st, 4th, and 8th weeks, fundus examination by indirect ophthalmoscopy and intraocular pressure measurement were conducted. Furthermore, electroretinographic (ERG) recordings were taken at the 4th and 8th weeks. At the end of the 8th week, eyes of the surviving 26 rabbits were enucleated, and then animals were sacrificed. Following necessary fixation procedures, histopathological investigations were conducted by using a light and electron microscope. In the histological cross sections, differences between the eyes with injection and the control group were evaluated, and total retinal thickness, inner nuclear layer thickness, and outer nuclear layer thickness were measured. Results: No pathology was found by clinical examination of either group. In the photopic and scotopic full-field ERG, conducted before the injection and in the 4th and 8th weeks after the injection, no statistically significant difference was determined between the study group and the control group. In the histological evaluation of the preparations, there were no statistically significant differences in the retina thickness of control and study groups. In the electron microscopic examinations, there were no toxicity findings in the eyes with injection. Conclusions: Our data show that intravitreal application of 0.3, 0.5, 0.75, and 1.5mg doses of Nepafenac active substance is nontoxic to the rabbit retina. © 2015 Mary Ann Liebert, Inc..
