Browsing by Author "Türel, I"

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Arsenic Residues in Grey Mullets Caught in Lake Van
(Scientific Technical Research Council Turkey, 1999) Bilgili, A; Yarsan, E; Türel, I
in this study, pollution caused by arsenic residues in grey mullets (Chalcarburnus tarichii, Pallas 1811) living in Van lake were investigated. A Total 120 samples, from the four seasons from 01.01.1994 to 01.01.1995 were collected. The organic parts of the muscles were washed with a mixture of magnesium oxide and magnesium nitrate according to the dry ash method and arsenic residues were measured by silver diethyl dithyocarbamate in a spectrophotometer. By analyzing the 120 fish samples, arsenic residues were calculated to be 0.009 - 0.347 ppm (average 0.051+/-0.046). In light of these results as the arsenic residues in grey mullets were below the level of 10 ppm, the accepted limit, it was concluded that arsenic intoxication poses no risk to human health.
Heavy Metal Levels in Mussels (Unio Stevenianus Krynicki) Obtained From Van Lake
(Scientific Technical Research Council Turkey, 2000) Yarsan, E; Bilgili, A; Türel, I
The aim of this study was to evaluate heavy metal levels in mussels (Unio stevenianus Krynicki) obtained from Van Lake. A total of 120 samples representing each of the four seasons was collected between 01.01.1994 and 01.01.1995. The organic parts of the samples were ashed with a mixture of magnesium oxide and magnesium nitrate according to the dry ashing method and arsenic residues were measured by silver diethyldithyocarbamate in UV spectrophotometer; copper, cadmium, zinc and lead levels were also determined using an atomic absorption spectrophotometer. In the analysis of the 120 samples for residues of heavy mettals, the average values were found to be: 1.43+/-0.81 ppm for lead, 0.09+/-0.02 ppm for cadmium, 5.83+/-0.73 ppm for copper, 15.93+/-3.26 ppm for zinc and 0.06+/-0.05 ppm for arsenic. Evaluation of the study results showed that these heavy metal levels were within the normal ranges for our country and other country's acceptable limits.
The Nitrate and Nitrite Levels of the Tubers of Potato Plant Fertilized With Different Doses
(Scientific Technical Research Council Turkey, 1999) Aksoy, A; Türel, I; Arslan, B; Dede, Ö
In this research,,This study was conducted to determine the effects of nitrogen forms (ammonyum nitrate, ammonyum sulphate and urea) and nitrogen doses (0. 7, 14, 21 and 28 g/m(2)) on nitrate and nitrite levels in potato cultivars (Caspar and Kondor). It was found that the levels of nitrate and nitrite obtained from the experiment did not exceed the accepted tolerance limits of 300 mg/g. However, differences among cultivars and nitrogen doses were found to be significant (p<0.05 and p<0.01, respectively) in terms of nitrate levels. The lowest nitrate levels were found in the caspar cultivar and the control. On the other hand, differences among nitrogen forms were found to be significant (p<0.05) in terms of nitrite levels. The highest nitrite levels was determined in ammonyum sulphate (27.67 ppb).
Pharmacokinetics of Oxytetracycline in Rainbow Trout (Oncorhynchus Mykiss) Following Administration of Medicated Feed
(Scientific Technical Research Council Turkey, 2003) Türel, I; Dagoglu, G; Yilmaz, O; Kankaya, E; Sen, F
The pharmacokinetics of oxytetracycline (OTC) were investigated in rainbow trout in freshwater at 10.5 degreesC. A group of 70 fish received OTC, an intravascular injection (i.v.) of 5 mg/kg body weight. Another group of 105 fish were fed medicated feed containing a dose of 100 mg/kg body weight. OTC. plasma concentrations were determined by high performance liquid chromatography. The pharmacokinetic parameters were described by a two-compartment open model giving distribution half-lives of 0.907 h and 16.058 h, and elimination half-lives of 33.5 h and 27 h for Lv. and oral administration of OTC, respectively. After i.v. administration of OTC, other pharmacokinetic parameters estimated were the area under the curve (AUC: 145.078 +/- 4.45 mug.ml(-1).h(-1)) and mean residence time (MRT: 40.604 +/- 1.150 h). Following oral administration, AUC was 34.46 +/- 1.189 mug.ml(-1).h(-1); MRT was 59.272 +/- 1.541 h; C-max was 0.577 mug/ml and T-max was 36 h. The oral bioavailability (F) of OTC in rainbow trout was found to be only 1.187%.