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Samsun, Turkey

Al-Obaidi F.N.,The University of Mustansiriyah | Sari H.,Gaziosmanpasa University | MacIt M.,Ondokuzmays University
Journal of Chemical and Engineering Data | Year: 2010

A potentiometic study has been carried out to reveal the coordination properties of 1,2-bis(4-benzylpiperidine)glyoxime (BPG), via its reaction with certain transition metal ions, Ni 2+, Cu 2+, and Zn 2+, and to determine the stability constants of the complexes formed. The experimental conditions were arranged to achieve all of the measurements and coordination in aqueous solution (mixed ethyl alcohol (10 %) and water (90 %)) at (25 ± 0.1) °C and an ionic background of 0.1 mol·dm -3 NaCl. The overall stability constants log β n values of all species formed in solution together with the dissociation constants of the ligand were calculated by use of the SUPERQUAD computer program. The dissociation constants of the ligand BPG are 2.830, 6.066, 6.966, and 9.510. The chemical species present in the solution under our experimental conditions were demonstrated by the use of speciation diagrams. © 2010 American Chemical Society.


Tas N.,Ordu University | Bayrak T.,Ordu University | Yagan O.,Ordu University | Bayrak A.,Ordu University | And 5 more authors.
Turkish Journal of Biochemistry | Year: 2014

Objective: The aim of the study was to investigate the changes of oxidative and anti-oxidative systems in the splanchnic area during carbon dioxide pneumoperitoneum and to determine whether the administration of dexmedetomidine has effects on these systems. Methods: Forty rats were randomized into four groups: Group I; Control, Group II; No pneumoperitoneum, Dexmedetomidine administration, Group III; Pneumoperitoneum, no Dexmedetomidine administration and Group IV; Pneumoperitoneum and Dexmedetomidine administration 30 minutes before insufflation. The rats were rested 30 minutes after desufflation and blood samples were obtained for; ischaemia modified albumin (IMA), myeloperoxidase (MPO), advanced oxidation protein products (AOPP), catalase (CAT), paraoxonase (PON1) and platelet-activating factor acetylhydrolase (PAF-AH) analyses. Results: When compared with the control group; the serum IMA levels significantly decreased in group II, and also increased in group III as compared to control (p<0.05). IMA levels were also significantly decreased in both groups II and IV as compared to group III (p<0.001). Serum MPO activity increased in group III as compared to control (p<0.05). Serum AOPP levels were significantly increased in group III as compared to group II (p<0.01) and decreased in group IV as compared to group III (p<0.01). Serum CAT activity was higher in group II than controls (p<0.05). Serum PON and plasma PAF-AH activities significantly decreased in grup III as compared to group II (p<0.05) and plasma PAF-AH activity were decreased in group III as compared to controls (p<0.05). Conclusion: In conclusion, administration of dexmedetomidine; prior to ischemia reperfusion injury caused by pneumoperitoneum; reduces the oxidative injury and increases the antioxidant activity in the acute period. © TurkJBiochem.com.


Aydn Temel F.,Giresun University | Kuleyin A.,Ondokuzmays University
Desalination and Water Treatment | Year: 2016

The scope of this study is to research the removal of NH4-N from landfill leachate using natural Turkish zeolite by adsorption process. The effects of pH (2–8), contact time (5–1,440 min), adsorbent dosage (30–150 g L−1), agitation speed (100–300 rpm), initial concentration (263.2–1,363.6 mg L−1), and particle size (10–65 mesh) were examined on the adsorption process. The optimum conditions in the adsorption process were established as follows: pH (its pH value of leachate), 60 min of contact time, 100 g L−1 of adsorbent dosage, 200 rpm of agitation speed, 263.2 mg L−1 of initial concentration, and −20 + 35 mesh of particle size. The adsorption kinetics and isotherms were tested to understand the adsorption mechanism using three kinetic models, i.e. Elovich, intraparticle diffusion, the pseudo-second-order reaction kinetic models, and four isotherm models, i.e. Dubinin–Radushkevich, Langmuir, Tempkin, and Freundlich isotherm models. Correlation coefficients, kinetic, and isotherm parameters were calculated. It was shown that the best conformity kinetic model was the pseudo-second-order reaction kinetic model (R2 > 0.99) for the present study. According to the results obtained from isotherms experiments, the adsorption equilibrium was defined well by the Langmuir and Tempkin isotherm model for NH4-N adsorption onto zeolite. The thermodynamic parameters were also detected. The values of Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy of activation (ΔS°) were 5.7113–6.5018 kJ mol−1, −8.5415, and 8.8209 J mol−1 K−1, respectively. They were showed that the NH4-N adsorption process onto zeolite was an exothermic physical adsorption process, randomness, and non spontaneous in the temperature range studied (25–60°C). Results indicate that zeolite is the most efficient cation exchanger for NH4-N removal from landfill leachate. © 2016 Balaban Desalination Publications. All rights reserved.


Yavuz D.G.,Marmara University | Bilen H.,Ataturk University | Sancak S.,Fatih Sultan Mehmet Training and Research Hospital | Garip T.,Clinic of Endocrinology and Metabolism | And 10 more authors.
Patient Preference and Adherence | Year: 2016

Objective: The objective of this study is to evaluate the impact of sequential telephonic interviews on treatment persistence and daily adherence to insulin injections among insulin-naïve type 2 diabetes patients initiated on different insulin regimens in a 3-month period. Methods: A total of 1,456 insulin-naïve patients with type 2 diabetes (mean [standard deviation, SD] age: 56.0 [12.0] years, 49.1% were females) initiated on insulin therapy and consecutively randomized to sequential (n=733) and single (n=723) telephonic interview groups were included. Data on insulin treatment and self-reported blood glucose values were obtained via telephone interview. Logistic regression analysis was performed for factors predicting increased likelihood of persistence and skipping an injection. Results: Overall, 76.8% patients (83.2% in sequential vs 70.3% in single interview group, (P<0.001) remained on insulin treatment at the third month. Significantly higher rate for skipping doses was noted in basal bolus than in other regimens (27.0% vs 15.0% for premixed and 15.8% basal insulin, respectively, P<0.0001). Logistic regression analysis revealed sequential telephonic interview (odds ratio [OR], 1.531 95% confidence interval [CI], 1.093-2.143 P=0.013), higher hemoglobin A1c levels (OR, 1.090 95% CI, 0.999-1.189 P=0.049), and less negative appraisal of insulin therapy as significant predictors of higher persistence. Basal bolus regimen (OR, 1.583 95% CI, 1.011-2.479 P=0.045) and higher hemoglobin A1c levels (OR, 1.114 95% CI, 1.028-1.207 P=0.008) were the significant predictors of increased likelihood of skipping an injection. Conclusion: Our findings revealed positive influence of sequential telephonic interview, although including no intervention in treatment, on achieving better treatment persistence in type 2 diabetes patients initiating insulin. © 2016 Yavuz et al.


Both electrical conductivity of soil saturation paste extract (ECe) and plant water consumption (ET) should be considered for assessing crop yield tolerances to salinity since ET decreases by increased salinity effects. In this study, conducted in a greenhouse under controlled conditions, it was afforded to use soil salinity and water consumption for the purpose of assessing plant responses to salinity. Additionally, growth and yield of green long pepper (Capsicum annuum L. Demre) under different saline and water regime conditions were examined. For these purposes, the green long pepper were exposed to six water salinity levels (S1= 0.65; S2= 2.0; S3= 3.0; S4= 4.0; S5= 5.0 and S6= 7.0 dS m-1) and four water application rates (IR1= 1.43; IR2= 1.0; IR3= 0.75 and IR4= 0.50 times of depleted water). The yield response factor (Ky), is 1.56 for salinity stress and 1.66 for water stress. Water consumption of the plant exponentially decreased (ET= 0.83×ECe -0.17) whereas relative fruit yield decreased linearly (7.03%) for unit increase in soil salinity after a threshold value of 1.20 dS m-1. A stronger three-dimensional relation was found among relative yield, relative water consumption and soil salinity (R2= 0.94). Using water consumption as a second factor in evaluation of plant response to salinity may be useful for reflecting effects of different climatic conditions. © Ankara Üniversitesi Ziraat Fakültesi.

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