The concentrations of four metals (copper, cadmium, zinc and lead) were quantified in blue crabs (Callinectes sapidus) tissues collected in January, April, June and September at two stations in Mersin Bay, northeastern Mediterranean Sea, using ICP-MS. The metal concentrations in crabs from the two stations differed significantly. The hepatopancreas was the major organ accumulating metals, followed by gill and muscle tissues. Except for lead, the highest concentrations of metals were measured in the hepatopancreas. The hepatopancreas had higher concentrations of all heavy metals (Cu 321.1 ± 4.30; Zn 182.2 ± 3.40; Cd 48.2 ± 2.00) compared to gill (Cu 90.2 ± 1.35; Zn 104.3 ± 2.30; Cd 22.3 ± 3.40) and muscle (Cu 19.1 ± 1.10; Zn 55.1 ± 3.25; Cd 2.5 ± 0.20). Among the metals analyzed, Cu, Zn and Pb were the most abundant in the different tissues while Cd was the least abundant in C. sapidus. Seasonality in the levels of the four metals was determined.The highest concentrations of all metals were observed in the June (Zn 55.1 ± 3.25; Cu 19.1 ± 1.10; Cd 2.5 ± 0.20; Pb 5.1 ± 0.18) compared to all other months (Zn 34.1 ± 3.23; Cu 11.1 ± 1.15; Cd 0.9 ± 0.20; Pb 3.1 ± 0.21).
The purpose of this investigation was to evaluate the effects of lead (Pb) and lead + zinc (Zn) combination on the oxidative stress, total ATPase and Pb accumulation in the tissues of Oreochromis niloticus (Linnaeus, 1758). The fish were exposed to 0.1 mg/L Pb (T1), 1.0 mg/L Pb (T2) and mixtures of 0.1 mg/L Pb and 0.5 mg/L Zn (M1); 1.0 mg/L Pb and 5.0 mg/L Zn (M2) for 7 and 21 days. Pb accumulation, total ATPase activity, several antioxidant enzyme activities such as catalase, glutathione peroxidase (GPX), glutathione S-transferase, glutathione reductase, and thiobarbituric acid reactive substances concentrations were measured in the liver and kidney tissues. Metal accumulation in the tissues was higher in Pb exposure compare with mixtures of Pb and Zn exposures. Beside the inhibition of liver GPX activity, general increases of antioxidant enzyme activities in the tissues were recorded after metal exposures. This investigation emphasizes the oxidative stress in O. niloticus caused by Pb, and adaptation of the organisms to the changes in enzyme activities.
Bu çalışmada Oreochromis niloticus'un kas dokusunda glutatyon S-transferaz aktivitesi ile glutatyon ve protein miktarı üzerine bakır ve bakırın kalsiyum karışımlarının etkisi incelenmiştir.
Öz Akuatik ekosistemler üzerine metallerin toksik etkileri balıklarda enzim aktivitelerinin ölçülmesiyle değerlendirilebilmektedir. Bu çalışmada civanın (Hg) Oreochromis niloticus (Linnaeus, 1758)'un solungaç ve kas dokularında asetilkolinestraz (AChE), glutatyon peroksidaz (GPx) ve glutamik piruvat transaminaz (GPT) aktivitelerine etkisi incelenmiştir. Balıklar 7 ve 21 günlük sürelerle 0,1 ve 0,01 ppm Hg konsantrasyonlarının etkisine maruz bırakılmıştır. Dokuların enzim aktiviteleri ultraviyole spektrofotometrik yöntem ile belirlenmiştir. Civa etkisinde AChE aktivitesi kontrol grubuna göre solungaç ve kas dokularında genel olarak azalırken GPx aktivitesi artmıştır. Kas GPT aktivitesi her iki sürede de kontrol grubuna göre artmıştır. Solungaçta GPT aktivitesi ise ilk 7 günlük sürede artarken 21 günlük sürede azalmıştır. Araştırma sonuçları düşük ve yüksek civa konsantrayonlarının Oreochromis niloticus'un solungaç ve kas dokularında AChE, GPx ve GPT aktivitelerinin değişmesine neden olduğunu göstermiştir.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.