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Öğe Determination of Urinary Calcium and Magnesium Levels by Atomic Absorption Spectrophotometry in Hypertensive Patients(ASIAN JOURNAL OF CHEMISTRY, 2012) Battaloglu, Rifat; Kayakirilmaz, Kadriye; Bayol, EmelUrinary Magnesium and calcium excretion has been determined in 36 patients suffering from hypertension compared with 31 age and gender Matched normotensive control subject living in Nigde. Overnight urine samples were collected. Magnesium and calcium were determined by atomic absorption spectroscopy. The differences in urinary calcium excretion between normotensive (171.3 +/- 11.9 mg/day) and hypertensive (151.3 +/- 13.0 mg/day) and urinary magnesium excretion between normotensive (40.1 +/- 4.1 mg/day) and hypertensive (46.8 +/- 12 mg/day) were not significants (p > 0.05).Öğe Electrodeposition, characterization and long term stability of NiW and NiWZn coatings on copper substrate in alkaline solution(KOREAN INST METALS MATERIALS, 2013) Surme, Yavuz; Gurten, A. Ali; Kayakirilmaz, KadriyeThis paper describes the electrodeposition of Ni, NiW and NiWZn coatings onto copper surfaces from electrolyte solutions containing Na3C6H5O7, Na2WO4, NiSO4 and ZnSO4. The electrocatalytic effects of electrodeposited coatings were investigated for hydrogen evolution reactions in 1 M NaOH solution. Surface characterization studies were carried out by energy dispersive X-ray spectroscopy, scanning electron microscopy, atomic force microscopy and cross-section analysis. The effect of operating conditions on the chemical composition, microstructure and electrocatalytic properties of Ni-W coatings was studied. The Zn ions were used to improve the active surface area and catalytic activity of the electrodeposited surface. The electrocatalytic activity of NiW and NiWZn coated electrodes for the hydrogen evolution reaction in alkaline solution was compared with that of an electrodeposited Ni electrode and copper substrate by using cathodic polarization curves and electrochemical impedance spectroscopy techniques over 96 h of electrolysis. The results proved that the NiWZn coated electrode showed better electrocatalytic activity and durability than bare Cu, Ni and NiW coatings.Öğe Influence of polyvinylpyrrolidone on rebar corrosion in sulphate solution(TECHNO-PRESS, 2009) Gurten, A. Ali; Bayol, Emel; Kayakirilmaz, Kadriye; Erbil, MehmetThis paper reports the results of an experimental investigation of the polyvinylpyrrolidone (PVP) influence on the steel reinforcement corrosion and compressive strength of concretes in sulphate medium. The effect of admixture of PVP in concrete on the corrosion resistance of steel reinforced concrete was assessed by measuring electrochemical test during 60 days immersion in two different external solutions. AC impedance spectrum indicated that the resistance of PVP mixed electrodes were higher than those without PVP. The compressive strength of concrete specimens containing PVP was measured and an increase of 190%similar to 24% was observed.Öğe Nutritional and zinc levels in serum and hair of university students in Nigde, Turkey(ASIAN JOURNAL OF CHEMISTRY, 2007) Oztuerk, Zeynep Alan; Battaloglu, Rifat; Kayakirilmaz, Kadriye; Aksoy, Meral; Bayol, EmelThis research has been designed for the determination of the nutritional status of university students, in particular reference to dietary zinc amount taken. The aim was to find out reflection of dietary zinc to that of serum and hair zinc contents. Forty volunteers' students of Nigde University (24 females and 16 males) participated in the first step of research. Three years later, 17 females and 10 males. from this group participated for the second stage of research. Students' nutritional status was evaluated according to their food consumption and physical examination. After analyzing the collected blood and hair samples, the mineral status was also evaluated. At the two steps of research no one had any serious mineral and other nutrients deficiencies. Only one female student having mineral deficiency at the first step of work recovered after the treatment. Regression analysis showed that there was a statistically significant correlation between dietary zinc concentration and hair and serum mineral levels (r(diet-hair) = 0.500, n = 40, p < 0.01, r(diet-serum) = 0.470, n = 40, p < 0.01).Öğe Nutritional status and calcium levels in serum and urine of primary hypertensives and normotensives(ASIAN JOURNAL OF CHEMISTRY, 2008) Kayakirilmaz, Kadriye; Bayol, Emel; Yilmaz, Hatice Bal; Ozgun, Hacer Kutluk; Ozbek, Tulay; Topuz, Dervis; Battaloglu, RifatThis research has been designed for the determination of the nutritional status, serum and urinary calcium (UCa) levels and correlation between UCa and blood pressure (BP). 31 Volunteers' patients with essential hypertension (HT) and 31 age- and gender-matched normotensive (NT) control subjects living in Ankara and Nigde from Turkey have participated in this study. 62 Subjects' 24 h urinary samples were collected. Besides, for determination of the correlation between 24 h UCa and overnight UCa (12 h UCa), 38 urine samples (9 patients and 29 control subjects) were collected. Nutritional status was evaluated according to their food consumption and physical examination. After analyzing the collected blood and urinary samples, the mineral status was also evaluated. Urinary and serum Ca levels were determined by flame atomic adsorption spectroscopy. The mean 24 h urinary Ca excretion rates (24 h UCaV) in hypertensive and normotensive subjects were 101 +/- 69 and 128 +/- 85 mg/day, respectively (n = 62, t = 1.378, p > 0.05). The mean serum Ca levels in HT was significantly decreased when compared with the controls (n = 26, t = 2.54, p < 0.05). In NT subjects systolic blood pressure (SBP) correlated positively with diastolic blood pressure (DBP) (r = 0.588) and UCaV (r = 0.516) and negatively with dietary Ca (r = -0.617, for all p < 0.05). In NT group DBP correlated positively with body mass index (BMI) (p < 0.05). In HT subjects, SBP correlated positively with DBP (r = 0.741) and negatively with serum Ca (r = -0.633), DBP also correlated negatively with serum Ca (r = 0.727). Among the 38 subjects, overnight calcium excretion rate (12 h UCaV) was correlated with the 24 h UCaV (y = 0.8279x + 42.735, r = 0.81, R-2 0.653, p < 0.05).Öğe Nutritional Status and Magnesium Levels in Serum and Urine of Primary Hypertensives and Normotensives(ASIAN JOURNAL OF CHEMISTRY, 2011) Kayakirilmaz, Kadriye; Bayol, Emel; Yilmaz, Hatice Bal; Ariogul, ServetThis research has been designed for the determination of the nutritional status, serum and urinary magnesium (UMg) levels and I correlation between urinary magnesium and blood pressure (BP). Thirty two volunteers' patients with essential hypertension (HT) and 35 normotensive (NT) control subjects, aged 21-79 years, have participated in this study. Fifty five subjects 24-h urinary samples were collected (28NT and 27HT). Besides, for determination of the correlation between 24 hUMgV and overnight excretion rate urinary magnesium (12 hUMgV), 43 urine samples were collected. Nutritional status was evaluated according to their food consumption and physical examination. After analyzing the collected blood and urinary samples, the mineral status was also evaluated. Among 13 hypertensive subjects three women had serum magnesium values lower than 1.7 mg Mg/dL (1.38-1.68 %). After 6 months treatment with magnesium, serum magnesium concentrations have increased to normal levels. In both groups blood pressure was positively correlated with UMgV and in hypertension group blood pressure was negatively correlated with serum magnesium levels (p < 0.05). Among the 43 subjects, 12 h UMgV was correlated with the 24 h UMgV and also in normotensive group UMgV was correlated positively with UCaV (p < 0.05). Overnight urinary magnesium excretion rate was correlated with the 24 h UMgV, so 12 h UMgV should be usually employable.Öğe Removal of textile dye Lanaset Red G from waters by electrochemical degradation and spectrophotometric determination(TAYLOR & FRANCIS INC, 2015) Suerme, Yavuz; Yilmaz, Rasit Fikret; Kayakirilmaz, KadriyeThe removal of Lanaset Red G, a kind of azo dye, has been studied with graphite electrodes in aqueous solution by electrochemical method. Graphite electrodes were used as anode and cathode in the decolourization process. Concentration of dye molecules in aqueous solution was determined by the ultraviolet-visible spectrophotometric technique. The operational parameters including initial pH, effect on the conductivity and time of electrolysis were optimized. The surface morphology of electrodes was also investigated and found that the surface of anode was affected by electrolysis. The results indicated that for a solution of 50 mg L-1 dye, almost 94% of dye was removed under optimum conditions. The optimized conditions were successfully applied to remove dye molecules present in real textile effluent and lake waters.Öğe Some nutritional habits and serum calcium, magnesium levels of cardiovascular patients lived in Ni?de province(2006) Aksoy, Meral; Alan, Zeynep; Kayakirilmaz, Kadriye; Gözmen, MakbuleTwenty six cardiovascular patients who applied Ni?de State hospital and fifty three volunteer's people have been included into the research as working group and control group respectively. Their anthropometrics measurements were taken and questionnaire about the food consumption frequency. Theirs serum calcium and magnesium levels in serum has been also determined. According to BMI categories majority of the work group' subjects were in obese group. Similar to this finding alcohol, coffee intake and smoke habits were more common in the work group. When food consumption frequency between the groups was investigated, it was found that the healthy group consumed legumes and dairy products more commonly to that of the work group. The difference between the groups was statistically important. Moreover it was the same for refine foods like table sugar that has only empty calorie and the others. While the group's calcium levels were not different from each others, the magnesium levels were found to be statistically higher for the work group than that of the control group. However magnesium levels of the subjects who alcohol consumption were found to be decreased according to the total group value. The high value of magnesium in the work group could be a kind of proof that the disease is still active. The decreased value of mineral in alcohol consumption subjects could be an indicator for increased requirement.Öğe The effect of thiosemicarbazide on corrosion resistance of steel reinforcement in concrete(ELSEVIER SCI LTD, 2007) Gurten, A. Ali; Kayakirilmaz, Kadriye; Erbil, MehmetThis study describes a laboratory investigation of the influence of thiosemicarbazide (TSC) on the corrosion of reinforcing steel and the compressive strength of concrete. The effect of TSC on the corrosion resistance of steel reinforced concrete was evaluated by carrying out electrochemical tests in NaCl and NaCl + TSC solutions for 60 days. Polarisation resistance (R(P)) values of TSC added reinforced concrete were much higher than those without TSC. Similarly, AC impedance spectra revealed that the resistance of TSC mixed electrodes were also quite higher than those without. The compressive strength of concrete specimens containing TSC was measured and an increase of 20-25% was observed. (c) 2005 Elsevier Ltd. All rights reserved.Öğe The inhibition effect of Azure A on mild steel in 1 M HCl. A complete study: Adsorption, temperature, duration and quantum chemical aspects(PERGAMON-ELSEVIER SCIENCE LTD, 2012) Ozkir, Demet; Kayakirilmaz, Kadriye; Bayol, Emel; Gurten, A. Ali; Kandemirli, FatmaIn this study, inhibition effect of Azure A on mild steel in 1.0 M HCl were evaluated by using electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR), and potentiodynamic polarization and scanning electron microscope (SEM) methods. These studies were carried out at different concentrations, temperatures and durations. The inhibitor molecules were chemisorbed on electrode surface according to the Langmuir adsorption isotherm. The quantum chemical calculations were employed to give further insight into the inhibition mechanism of Azure A. (C) 2011 Elsevier Ltd. All rights reserved.Öğe The Inhibitor Effect of (E)-5-[(4-(benzyl(methyl)amino)phenyl)diazenyl]-1,4-dimethyl-1H-1,2,4-triazol-4-ium zinc(II) Chloride, an Industrial Cationic Azo Dye, onto Reducing Acidic Corrosion Rate of Mild Steel(Korean Electrochemistry Soc, 2020) Ozkir, Demet; Kayakirilmaz, KadriyeThis study covers the stages of testing whether the azo dye with chemical name (E)-5-[(4-(benzyl(methy)amino)phenyl)diazenyl]-1,4-dimethyl-1H-1,2,4-triazol-4-ium zinc (II) chloride (DMT), known as Maxilon Red GRL in the dye industry, can be used as an anticorrosive feasible inhibitory agent, especially in industrial areas other than carpet, yarn and fibre dyeing. These test stages consist of the electrochemical measurement techniques such as potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) for diverse concentrations and durations. The adsorption of the viewed DMT molecule on the mild steel surface obeyed the Langmuir isotherm. The zero charge potential (PZC) of mild steel was also found to assess the inhibition mechanism in containing DMT solution. The inhibition performance of DMT on the mild steel in a 1.0 M HCl solution was also investigated using methods such as metal microscope, atomic force microscope (AFM) and field emission scanning electron microscope (FE-SEM).
