جستجوی مقالات مرتبط با کلیدواژه "endocrine system" در نشریات گروه "زیست شناسی"

Chlorpyrifos is one of the strong organophosphate pesticides that use very much and lead poisoning, disruptor in immune and physiology systems and live activities of aquatic organisms. Therefore, its effects can use as the biological indicator in a determination of pollutants. In this study, the effect of different concentrations of Chlorpyrifos (5, 10, 20, 30 and 40 mg/L) were investigated on thyroid hormones of grass carp (Ctenopharyngodon idellus) during 14 days. Blood sampling performed in 12, 24 and 96h and also 7 and 14 days after the exposure. The concentrations of serum thyroid hormone were determined using Radioimmunoassay method. Results showed the significant decrement in the serum T3 and increment of the serum T4 in the treated fishes in comparison to the control groups. In addition, the decrement in ratio T3/T4 was observed (P

Cadmium is a heavy metal that is known as a pollutant in aquatic environments. This heavy metal may cause destroying effects via affecting on fish endocrine glands and metabolism. Thyroid hormones have the important role in growth, development and reproduction system in fish. The aim of the current study was the assessment of Cadmium effects on thyroid function in male Yellowfin Seabream, Acanthopagrus latus. Fish specimens were exposed to different Cadmium concentrations (1, 3, 6, 9 and 12 mg/liter) those were selected according to the toxicity test, for 2 weeks. Blood samplings were conducted at 7 and 14 days after the test was started. Plasma levels of thyroid hormones (triiodothyronine and tetraiodothyronine) were assayed using Radioimmunoassay method. Plasma T3 levels and T3/T4 ratios had significant and indirect relation with Cadmium concentrations whereas T4 showed direct relation and increased significantly after Cadmium exposure. These results demonstrated the negative effects of Cadmium on thyroid hormones homeostasis via inhibiting the 5'-monoiodinase and T4 to T3 conversion.