Browsing by Author "Yilmaz, S."

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Dissolution and Mechanism of Tincal in Ammonium Carbonate Solutions
(Chemical Publishing Co., 2010) Yildiz, A.; Nas, M.S.; Kubilay, S.; Yilmaz, S.
In this paper the dissolution and mechanism of tincal, sodium tetraborate decahydrate (Na2B4O710H2O), in ammonium carbonate solutions using the effects parameters of reaction temperature, solution concentration, solid to liquid ratio, particle size and stirring speed. The results showed that the dissolution rate increased with increasing solution concentration and reaction temperature and increased with decreasing particle size and solid to liquid ratio. It was also determined that stirring speed exerted no significant effect on dissolution rate.
Mesenchymal Stem Cell: Does It Work in an Experimental Model With Acute Respiratory Distress Syndrome
(Nature Publishing Group, 2016) Yilmaz, S.; Inandiklioglu, N.; Yildizdas, D.; Subasi, C.; Acikalin, A.; Kuyucu, Y.; Karaoz, E.
Nitric Oxide Oxidation Products and the Activities of Catalase and Carbonic Anhydrase in Sheep With Fluorosis
(int Soc Fluoride Research, 2012) Yilmaz, S.; Yur, F.
This study was conducted to determine the levels of nitrite and nitrate and the activities of catalase and carbonic anhydrase in the blood of sheep with and without endemic fluorosis. Blood samples from 20 fluorotic and 10 healthy Morkaraman sheep 3-4 years old in the Van area of Turkey were collected and analyzed. In the fluorotic sheep the average catalase activity level in the blood was significantly lower at 1.72 vs. 11.23 mg/Hb in the healthy sheep. On the other hand, carbonic anhydrase enzyme activities were significantly higher in the fluorotic sheep at 2.13 vs. 0.13 mg/Hb in the healthy sheep. Nitrite and nitrate levels from oxidation of nitric oxide were 2.31 and 3.32 vs. 0.51 and 0.84 ppm in the fluorotic and healthy sheep, respectively. These results have important health implications for the widespread occurrence of fluorosis among people and animals living in these areas of Turkey.
Optimization of Methyl Orange Decolorization by Bismuth(0)-Doped Hydroxyapatite/Reduced Graphene Oxide Composite Using Rsm-Ccd
(Springer, 2024) Ecer, U.; Yilmaz, S.; Ulas, B.; Koc, S.
In the current study, the catalyst for the decolorization of methyl orange (MO) was developed HAp-rGO by the aqueous precipitation approach. Then, bismuth(0) nanoparticles (Bi NPs), which expect to show high activity, were reduced on the surface of the support material (HAp-rGO). The obtained catalyst was characterized by scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) techniques. The parameters that remarkably affect the decolorization process (such as time, initial dye concentration, NaBH4 amount, and catalyst amount) have been examined by response surface methodology (RSM), an optimization method that has acquired increasing significance in recent years. In the decolorization of MO, the optimum conditions were identified as 2.91 min, Co: 18.85 mg/L, NaBH4 amount: 18.35 mM, and Bi/HAp-rGO dosage: 2.12 mg/mL with MO decolorization efficiency of 99.60%. The decolorization process of MO with Bi/HAp-rGO was examined in detail kinetically and thermodynamically. Additionally, the possible decolorization mechanism was clarified. The present work provides a new insight into the use of the optimization process for both the effective usage of Bi/HAp-rGO and the catalytic reduction of dyes. © The Author(s) 2024.
Prenatal Exposure To Diclofenac Sodium Changes the Morphology of the Male Rat Cervical Spinal Cord: a Stereological and Histopathological Study
(2011) Özyurt, B.; Kesici, H.; Alici, S.K.; Yilmaz, S.; Odaci, E.; Aslan, H.; Kaplan, S.
Diclofenac sodium is one of the most commonly used non-steroidal anti-inflammatory drugs. It may cause alteration in the nervous system during neuronal development. However, there is no investigation concerning its role in the cervical spinal cord. Pregnant rats were divided into two groups, namely drug-treated and control (saline-injected) groups. To obtain the offspring of the drug-treated group, a dose of 1. mg/kg daily diclofenac sodium (Voltaren, 75. mg/3. ml ampoule, Novartis) was injected into the pregnant rats beginning from the 5th day after mating to the 20th day of the pregnancy. To obtain the control group of offspring, serum physiological at a 1. ml/kg daily dose was injected into the pregnant control rats during the same period. Male offspring were obtained after delivery and each group was divided into two subgroups: 4-week-old and 20-week-old. The total neuron number in diclofenac sodium-treated rats was significantly lower than in the control group animals. The total volume of the cervical spinal cord segments (C1-C4) was also estimated. There was a significant difference between the volumes of the two groups, especially in the 20-week-old subgroup. This may suggest that development of neurons and volume of cervical spinal cord are affected in prenatal animals after administration of diclofenac sodium. © 2011 Elsevier Inc.