Effect of Different Acid Components on Multi-Walled Carbon Nanotubes

In this study, interactions of multi-walled carbon nanotubes MWCNTs samples with Hydrochloric acid HCl , Nitric acid HNO3 , Aqua regia [ AR =HCl: HNO3 3:1 ] and Reverse aqua regia, [ RAR =HCl: HNO3 1:3 ] acid and acid mixtures were investigated. Changes in the structure of the samples were analyzed by Fourier transform infrared spectroscopy FT-IR and Raman spectroscopy. In addition, the adsorption rates of the acid solutions of the samples were determined. The MWCNTs material has been found to exhibit a high adsorption rate %34.70 for the RAR mixture. The same mixture caused the highest defect formation in the structure %25 . The AR mixture significantly reduced the number of defects in the sample %63 . According to the purposes of industrial and technological applications, acid and acid mixtures can be used to purify carbon-based structures and to extend the surface area by adding functional groups to the structure

ASSESSMENT OF ELEMENT CONCENTRATION DISTRIBUTION IN DIFFERENT RAT ORGANS BY WAVELENGTH DISPERSIVE X-RAY FLUORESCENCE: EFFECTS OF ALUMINUM CHLORIDE

WOS: 000452689400004Aluminum (Al) is present on earth surface has different chemical forms. It is a toxic metal and it may cause different disorders such as osteomalacia, microcytic anemia, Alzheimer and Parkinson's disease. Thus, it is very important to understand the effects of Al on different organs. in order to examine its accumulation, rats (male Wistar) were exposed to 5 mg/kg/day AlC1(3) through gavage method for 30 days. At the end of the process, heart, brain, kidney and skin were removed and dried under sunlight. the samples were analyzed on a sequential Wavelength Dispersive X-ray Fluorescence (WDXRF) spectrometer. the results indicate that Al accumulates significantly in the brain. These results can be associated with neurotoxin effects. Although this study focused on the accumulation of Al, the concentration changes of detected elements from Beryllium (Be) to Uranium (U) accumulations were analyzed. the current study has proved that the WDXRF method is a quick, inexpensive and effective method in toxicological studies

Synthesis and characterization of cationic lipid coated magnetic nanoparticles using multiple emulsions as microreactors

WOS: 000397198500080The aim of this study was to develop a novel iron oxide nanoparticle synthesis method with in-situ surface coating. For this purpose multiple emulsions were used as microreactors for the first time and magnetic iron oxide particles synthesized in the core of cationic solid lipid nanoparticles. DLS, SEM, TEM, VSM, Raman Spectrometer, XRD, and XPS techniques were performed for characterization of the magnetic nanoparticles. Obtained magnetic nanoparticles are superparamagnetic and no additional process was needed for surface adjustments. They are positively charged as a result of cationic lipid coating and has appropriate particle size (< 30 nm) for drug or nucleic acid delivery. Structure analysis showed that magnetic core material is in the form of magnetite. Saturation magnetization value was measured as 15-17 emu g(-1) for lipid coated magnetic nanoparticles obtained by multiple emulsion method which is reasonably sufficient for magnetic targeting.Scientific and Technological Research Council of Turkey [TUBITAK]Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [SBAG 112S294]This work was supported by the Scientific and Technological Research Council of Turkey [TUBITAK SBAG 112S294, 2012]. In remembrance of our co-author Dr. Yusuf Selamet who passed away during the revision process of this paper

X-ray photoelectron spectroscopy (XPS) and gamma-ray shielding investigation of boro-silicate glasses contained alkali/alkaline modifier

In the present work, seven glass samples have been prepared utilizing melt-quenching method with composition of 40B₂O₃-10SiO₂-10Al₂O₃-30ZnO-10 (Li₂O/Na₂O/K₂O/MgO/CaO/SrO/BaO) all in mol%. Scanning electron microscope (SEM) and Energy-dispersive X-ray spectroscopy (EDX) have characterized for H3 (K₂O) and H7 (BaO), to examine the structural properties. X-ray Photoelectron Spectroscopy (XPS) has shown that the boron (B) element composition is highest after oxygen elements in all the glasses. It has been also observed that incorporation of potassium (K) and strontium (Sr) elements are maximum compared to the other doped elements into the glass. Further, the photon shielding for H1-H7 samples were also studied. We calculated the mass attenuation coefficients (μ/ρ) for the present samples at some energies between 0.015 and 10 MeV. The results revealed that H7 (BaO) sample owns the highest μ/ρ values followed by H6 (SrO) while H1 (Li₂O) has the lowest μ/ρ. Moreover, H7 and H6 samples have higher effective atomic number than the rest of glasses. H7 sample has excellent shielding properties when compared with the other glasses. We found that the composition of the sample affects the attenuation of the glasses and high attenuation can be achieved when we used heavy metal oxides (such as BaO)

Dopamine Agonist-Induced Impulse Control Disorders in Patients With Prolactinoma: A Cross-Sectional Multicenter Study

Context: Dopamine agonist (DA)-induced impulse control disorder (ICD) in patients with prolactinomas is not sufficiently known

Dopamine D4 Receptor Gene Exon III VNTR Variant Influences Smoking Status in Turkish Population

Introduction: Dopaminergic gene variants may affect nicotine dependence through their possible impact on the dopamine reward pathway. The purpose of this study is to investigate the relationship between the variable number tandem repeat (VNTR) variant in exon III of the Dopamine D4 receptor (DRD4) gene and genetic predisposition of smoking status in a Turkish population

Prevalence and predictors of gestational diabetes mellitus: a nationwide multicentre prospective study

Cetinkaya, Esra/0000-0003-2415-1236; Taskiran, Bengur/0000-0003-4842-450X; MELEKOGLU, RAUF/0000-0001-7113-6691; pekkolay, zafer/0000-0002-5323-2257; Ozer, Alev/0000-0002-0934-0226; kilinc, faruk/0000-0002-0198-2558; Aygun, Elif Ganime/0000-0003-3737-7250; KARAKILIC, ERSEN/0000-0003-3590-2656; Aydin, Hasan/0000-0003-4246-0681WOS: 000457530200011PubMed: 30402933Aim Prevalence rates of gestational diabetes mellitus (GDM) show considerable variation among different countries and regions of the world. The primary aim of this study was to determine the nationwide prevalence and predictors of GDM in Turkey. Methods We conducted prospective nationwide screening among pregnant women. Between August 2016 and November 2017, a total of 2643 pregnant women from 51 centres in 12 different regions were enrolled. A two-step screening method and Carpenter and Coustan criteria were used in the diagnosis of GDM. Clinical and biochemical data were obtained using electronic database software. Results The national prevalence of GDM was found to be 16.2% [95% confidence intervals (CI) 15.0% to 17.4%] without a significant difference between urban and rural regions. Women with GDM were older (mean age: 32 +/- 5 vs. 28 +/- 5 years, P < 0.001) and heavier (mean BMI: 27.2 +/- 5.1 vs. 24.7 +/- 4.7 kg/m(2), P < 0.001) than their counterparts without GDM. The prevalence of GDM tended to increase with age (< 25 years, 6.9%; 26-35 years, 15.6%; and 36-45 years, 32.7%; P < 0.001). Maternal age, maternal BMI, history of previous GDM and family history of diabetes mellitus were independent predictors of developing GDM (P < 0.05 for all). Low-risk women (age < 25 years, BMI < 25 kg/m(2), no family history of diabetes) comprised 10.7% of the total population and the prevalence of GDM in these women was 4.5% (95% CI 2.4% to 7.8%). Conclusion The results of this nationwide study indicate that GDM is very common, affecting one in seven pregnancies in Turkey. Implementation of international guidelines on screening and management of this public health problem is required