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    Efficiency of ascorbic acid against oxidative stress-induced dimethoate toxicity in fish, Capoeta capoeta [Guldenstaedt, 1773]
    (Triveni Enterprises, 2017) Yilmaz, M.; Kaya, I.; Koc, E.; Tanriverdl, E. A.; Kaya, M. M.; Ersan, Y.
    Aim: The main objective of the present study was to evaluate the effect of ascorbic acid against oxidative stress-induced by dimethoate in Capoeta capoeta. Methodology: The fish caught in Kars Creek were randomized in four equal groups and acclimatized in separate tanks. The fish were kept in tanks for 10 days as follows: Group I (control) was kept in normal water, Group II, Ill and IV were kept in separate tanks containing 2 mgrdimethoate and 2 mgr dimethoate plus 100 mgr' ascorbic acid and ascorbic acid. The level of total sialic acid, total antioxidant status and total oxidant status in fish serum were analyzed. Results: Total sialic acid level of Group III was found to be lower than the level of Group II (P< 0.05), there were no statistically important differences between these two groups in total antioxidant status and oxidant status. In gills, intensive cartilage degenerations and mononuclear cell infiltrations in group II and III were observed. It was found that toxic effects of dimethoate in group III decreased. Interpretation: Ascorbic acid in fish exposed to dimethoate reduced the level of total sialic acid and degenerations in lamellae of gills, it had no significant effect on the oxidative stress response. [GRAPHICS] .
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    Mechanical properties and corrosion behavior of similar/dissimilar resistance spot welded automotive aluminum alloysMechanische Eigenschaften und Korrosionsverhalten von artgleichen/artungleichen widerstandspunktgeschweißten Aluminiumlegierungen für die Automobilindustrie
    (Wiley-V C H Verlag Gmbh, 2023) Kaya, I.; Baser, T. A.; Kahraman, N.
    Recently, usage of high strength aluminum alloys in automotive applications increase. The reasons for that increase are the light-weight, high strength, good formability, weldability and corrosion resistance of the aluminum alloys to improve fuel economy as well as decreasing carbon dioxide emission. Automotive hybrid structures are commonly manufactured using dissimilar AA5000-AA6000 joints to improve mechanical requirements and corrosion resistance of the parts. In this study, AA5754 H111-AA6063 T4 materials were joined both similarly and dissimilarly by resistance spot welding method. Within the study, a mid-frequency direct current technology was used instead of conventional alternative current technology. The welded zone was investigated by micro hardness measurements and microstructural characterization. Tensile-shear and cross-tension tests were performed. The welded zone of all welded specimens was subjected to salt spray corrosion test. A nugget pull-out fracture mode was observed on the fracture surface of the all welded joints after tensile-shear and cross-tension tests. The lowest hardness values were measured from the weld metals for all welded joints. Porosity and inclusion were observed in the weld nugget with minor cracks in heat affected zone by optical microscope investigations. In this work, AA5754 H111-AA6063 T4 materials were joined both similarly and dissimilarly by resistance spot welding method. A mid-frequency direct current technology was used instead of conventional alternative current (AC) technology. The welded zones were examined by micro hardness measurements, microstructural characterization, tensile-shear, cross-tension and salt spray corrosion tests.image