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- 저자 : Serkan Bayar (검색결과 4 건)
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ASSESSMENT OF AORTIC ELASTICITY PROPERTIES IN PATIENTS WITH CELIAC DISEASE
Nermin Bayar,Ayhan Hilmi Çekin,Şakir Arslan,Göksel Çağırcı,Selçuk Küçükseymen,Serkan Çay,Ferda Akbay Harmandar,Bayram Yeşil 대한심장학회 2016 Korean Circulation Journal Vol.46 No.2
Background and Objectives Celiac disease (CD) is a chronic autoimmune disorder induced by dietary gluten intake by individuals who are genetically sensitive. Many studies report an increased risk of cardiovascular diseases in such patients. The aim of this study is to assess aortic elasticity properties in patients with CD that may be associated with an increased risk of cardiovascular disease. Subjects and Methods Eighty-one patients diagnosed with CD by antibody test and biopsy and 63 healthy volunteers were included in this prospective study. Electrocardiographic and echocardiographic examinations were performed. Results The CD group did not have any differences in the conventional echocardiographic parameters compared to the healthy individuals. However, patients in the CD group had an increased aortic stiffness beta index (4.3±2.3 vs. 3.6±1.6, p=0.010), increased pressure strain elastic modulus (33.6±17.0 kPa vs. 28.5±16.7 kPa, p=0.037), decreased aortic distensibility (7.0±3.0×10-6 cm2/dyn vs. 8.2±3.6×10-6 cm2/dyn, p=0.037), and similar aortic strain (17.9±7.7 vs. 16.0±5.5, p=0.070) compared to the control group. Patients with CD were found to have an elevated neutrophil/lymphocyte ratio compared to the control group (2.54±0.63 vs. 2.24±0.63, p=0.012). However, gluten-free diet and neutrophil/lymphocyte ratio were not found to be associated with aortic elasticity. Conclusion Patients with CD had increased aortic stiffness and decreased aortic distensibility. Gluten-free diet enabled the patients with CD to have a reduction in the inflammatory parameters whereas the absence of a significant difference in the elastic properties of the aorta may suggest that the risk of cardiovascular disease persists in this patient group despite a gluten-free diet.
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Boron removal by means of chemical precipitation with calcium hydroxide and calcium borate formation
Alper Erdem Yilmaz,Recep Boncukcuoglu,Serkan Bayar,Baybars Ali Fil,Mehmet Muhtar Kocakerim 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.10
Boron removal was investigated by chemical precipitation from aqueous solutions containing boron using calcium hydroxide. pH, initial boron concentration, amount of Ca(OH)2, stirring speed and solution temperature were selected as operational parameters in a batch system. The highest boron removal efficiency was reached at pH 1.0. Increasing initial boron concentration and amount of calcium hydroxide raised to boron removal efficiency. Boron removal efficiency was highest at a stirring speed of 150 rpm. The most important parameter affecting boron removal efficiency was solution temperature. Increasing solution temperature increased importantly boron removal. XRD analysis showed that CaB3O3(OH)5·4H2O, which is a borate mineral called inyoite, occurred between Ca(OH)2 and borate ions. As a result of the obtained experimental data, when the optimum operational conditions were selected, over 96% of boron removal efficiency was reached by this method.
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Adsorption of Ni(II) on ion exchange resin: Kinetics, equilibrium and thermodynamic studies
Baybars Ali Fil,Recep Boncukcuoglu,Alper Erdem Yilmaz,Serkan Bayar 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.9
This article describes the ion exchange of a heavy metal Ni(II) from aqueous solutions onto a Dowex HCR-S, cationic resin. Batch adsorption studies were conducted to evaluate the effect of various parameters such as pH, resin dose, stirring speed, temperature, contact time and initial Ni(II) concentration on the removal of Ni(II). Adsorption rate increased with the increase in initial nickel concentration, stirring speed and temperature. Equilibrium adsorption isotherms were measured for the single component system, and the experimental data were analyzed by using Langmuir, Freundlich, Elovich, Temkin, Khan, Sips, Toth, Koble-Corrigan and Radke-Prausnitz isotherm equations. The Sips equation appears to fit the equilibrium data. Different models were tested for their applicability. Adsorption kinetic data were modeled using the Lagergren pseudo-first-order, Ho’s pseudo-second-order and Elovich models. It was found that Ho’s pseudo-second-order model could be used for the prediction of the system’s kinetics. Thermodynamic activation parameters such as ΔG*, ΔS* and ΔH* of the adsorption of Ni(II) on Dowex HCR-S cationic resin were also calculated.
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Alper Erdem Yilmaz,Baybars Ali Fil,Murat Tolga Yilmaz,Serkan Bayar,Zuhal Koksal The Korean Electrochemical Society 2024 Journal of electrochemical science and technology Vol.15 No.1
This work aims to investigate the efficiency of electrocoagulation (EC) of pistachio processing industrial wastewater (PPIW) using the continuous EC process. The tubular reactor made of stainless steel with an internal diameter of 60 mm was used as a cathode electrode. The effect of some parameters was examined on the removal of chemical oxygen demand (COD) and total phenols (TP) removal efficiency. The influences of the initial pH of wastewater (from 4 to 8), flow rate (from 25 to 125 mL/min), current density (from 7 to 21 mA/cm<sup>2</sup>), and supporting electrolyte type (NaCl, NaNO<sub>3</sub>, and Na<sub>2</sub>SO<sub>4</sub>), supporting electrolyte concentration (from 10 to 100 mg/L NaCl) on removal efficiency were investigated to determine the best experimental conditions. The examination of the physico-chemical parameters during the EC treatment showed that the best removal efficiency was obtained under conditions where the flow rate was 25 mL/min (20 min reaction time), the pH value was 5.2, and the current density was 21 mA/cm<sup>2</sup> has set. Under these experimental conditions, COD and TP removal efficiency were found to be 75% and 97%, respectively, while energy consumption was 18.5 kW h/m<sup>3</sup>. The study results show that the EC can be applied to PPIW pre-treatment.
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