فهرست مطالب behrouz davari

Some members of family Calliphoridae are myiasis agents and mechanical vectors of some pathogens. The aim of this study was to measure the biodiversity and synanthropy behaviour of Calliphoridae flies in Abadan, Khuzestan province. Data were collected based on a monthly schedule during March to December 2014 in urban, semi-urban and rural ecosystems of Abadan County. Bottle trap was equipped with 30 g of chicken liver and installed 3 days in each collection site where net collection was done for about 30 minutes. Synanthropy Index (SI) of flies and biodiversity indices including Simpson, Shannon-Wienner and Margalef were calculated. As many as 1479 samples of Calliphoridae were collected including 18, 1212 and 249 specimens of Chrysomyia megacephala, C. bezziana and C. albiceps respectively. C. bezziana showed a moderate SI in some collecting times. In spite of more collection of C. megacephala in all three ecosystems, its SI had the highest range in comparisons with the others. The biodiversity of Calliphoridae community was high in spring (H´= 0.67) while the highest diversity of dominant species was in autumn (1-D = 0.74). Margalef Index showed equal estimation of species richness in spring and autumn (Mg = 0.3) but it was reduced in summer. C. megacephala was the common species of Calliphoridae in Abadan. Abadan is an old international county in Iran which is the host of many domestic and international engineers, workers and visitors. Knowing the fauna and behaviour of medically important flies would be a major fact for the conditions of the health status of this city

The aim of this research was to investigate concentrations of cadmium (Cd), lead (Pb), chromium (Cr), copper (Cu), and zinc (Zn) in the muscle, gill, and liver of common carp (Cyprinus carpio), tuwini (Capoeta trutta), and Grass carp (Ctenopharyngodon idella) from Sirvan River, Kermanshah Province, Iran, during November to December 2014. This investigation was conducted in order to determine the potential health risk of the intake of these metals through the consumption of the edible parts of fish and also to assess the safe dietary intake levels of these metals. The results of the present study indicated that the highest and lowest accumulated metal concentrations were related to Zn and Cd, respectively. Moreover, the metal concentrations in the gill and liver were higher than in the muscles of the three fish species. The target hazard quotients (THQs) for an adult with mean body weight of 71.5 kg were below 1 based on Cd, Pb, Cr, Cu, and Zn levels. In conclusion, the obtained results indicated that the levels of metals in the edible muscle of fish species in this study were below the level of concern for human consumption.

The aim of the present study was to investigate the effect of copper oxide nanoparticles (CuO-NPs) and copper ions (Cu) on guppy (Poecilia reticulata), in order to assess Cu uptake in the gill, and histopathology of gill and intestinal organs in semi-static regimes for 10 days. Guppy fish were assigned into three groups; one control group, and two experimental groups receiving 20 µg/l of either Cu or CuO-NPs in a semi-static aqueous culture for 10 days. Gill and intestinal tissue samples were obtained under a standard protocol for further histopathological examinations. The notable alterations observed in gill tissues in the experimental groups were aneurism, fusion, gill epithelial hyperplasia, increased mucous secretion, and necrosis. Noticeable anomalies in intestinal tissue were increase in the number of goblet cells, swelling of goblet cells, degeneration, vacuolation, necrosis, and erosion. Moreover, copper accumulation in gill tissue in the Cu treated group was higher than that in the CuO-NPs treated group. In contrast, the severity of histopathological damages in gill and intestinal tissues was greater in the CuO-NPs experimental group.

The purpose of this study was to determine the effect of nickel (Ni) doped TiO2 NPs on gill histopathology of zebrafish (Danio rerio). In this study, a total number of 200 zebrafish (Danio rerio) with average weight of 3g and length body of 4cm were used. In this study, four non-lethal concentrations of Ni doped TiO2 NPs were used that included 1, 10, 30, 100 mg/L; also control group was considered. The results showed that the Ni doped TiO2 NPs on gill tissue cause some impacts such as secondary bending blades, blades secondary hypertrophy, increased mucus secretion, fusion in the secondary lamellae, hyperplasia and eventually necrosis increases. Although histological changes in gill tissue were observed in all groups, but the severity of these changes increased with increasing concentration of Ni doped TiO2 NPs. Moreover, changes were significant between exposure group and control group in parameters of diameter of gill filaments, diameter of secondary lamellae, and length of secondary lamellae (P