Can continuous positive airway pressure improve lower urinary tract symptoms and erectile dysfunction in male patients with severe obstructive sleep apnea syndrome?

Soner Coban,Aygul Gunes,Abdullah Gul,Ali Riza Turkoglu,Muhammet Guzelsoy,Murat Ozturk,Osman Akyuz,Ozgur Ekici 대한비뇨의학회 2020 Investigative and Clinical Urology Vol.61 No.6

Purpose: We aimed to investigate the effect of continuous positive airway pressure (CPAP) administered for the treatment of obstructive upper airway on lower urinary tract symptoms and erectile dysfunction in male patients. Materials and Methods: A total of 626 male with suspected obstructive sleep apnea syndrome (OSAS) were evaluated prospectively. Nocturnal polysomnography tests were administered to the male. After application of the exclusion criteria, 54 patients with severe OSAS (Apnea-Hypopnea Index ≥30) were included in the study. International Prostate Symptom Score (IPSS), International Index of Erectile Function (IIEF-15), and nocturia were assessed in all patients before and after CPAP therapy, and prostate volume, total prostate-specific antigen (tPSA), and uroflowmetric measurements were assessed in patients aged >40 years. Results: The mean age of the 54 patients was 47.06±11.15 years. Post-treatment IIEF scores were better than pre-treatment scores (24.27±7.58 vs. 22.68±8.65, p=0.014). IPSS values, nocturia, and uroflowmetric outcomes significantly improved after CPAP therapy (p<0.05). On the other hand, mean values of body mass index, tPSA, prostate volume, and postvoid residual urine volume did not differ significantly after treatment. Conclusions: CPAP therapy improves lower urinary tract symptoms, nocturia, and erectile dysfunction in male with severe OSAS.

Synthesis and characterization of hydrothermally grown potassium titanate nanowires

Derya Kapusuz,Y. Eren Kalay,박종이,Abdullah Ozturk 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.3

Potassium titanate (KT) nanowires were synthesized by a one-step hydrothermal reaction between TiO2 and aqueous KOH solution. The effects of KOH concentration and reaction time on hydrothermal formation and KT nanowire growth were investigated. The nanowire growth mechanism was elucidated using a combined study of powder X-ray diffraction, and scanning and transmission electron microscopy. The results revealed that hydrothermal growth was initiated by the formation of amorphous-like Ti-O-K sheets in anatase. Increasing hydrothermal reaction time caused the transformation of anatase to Ti-O-K sheets, from which potassium hexa-titanate (K2Ti6O13) nuclei formed and grew to establish one-dimensional morphology through preferential growth along the b-axis. It was revealed that the hydrothermal reactions followed a quite different mechanism than the well-known calcination route. Potassium tetra-titanate (K2Ti4O9) crystals formed in the amorphous region using the hexa-titanate phase as a nucleation site for heterogeneous crystallization. Increasing the KOH concentration in the solution accelerated the hydrothermal reaction rate.

Production and properties of tooth-colored yttria stabilized zirconia ceramics for dental applications

Kaplan, Melis,Park, Jongee,Young Kim, Soo,Ozturk, Abdullah Elsevier 2018 Ceramics international Vol.44 No.2

<P><B>Abstract</B></P> <P>Dense zirconia stabilized with 3mol% yttria ceramics were produced in disc shape by first cold isostatically pressing at 100MPa and then sintering at 1450°C at ambient laboratory conditions. Coloring was accomplished by immersion the discs in NiCl<SUB>2</SUB>, MoCl<SUB>3</SUB>, and NiCl<SUB>2</SUB> + MoCl<SUB>3</SUB> solutions for 5, 30, and 60s. Different concentrations (0.1, 0.25, and 0.5wt%) were applied to get the color of natural tooth. The density, color, microhardness, fracture toughness, compressive strength, and wear rate of the discs were measured to evaluate the suitability of the colored discs for dental applications. Color assessments were made by measuring CIE Lab <I>L</I> <SUP> <I>*</I> </SUP>, <I>a</I> <SUP> <I>*</I> </SUP>, <I>b</I> <SUP> <I>*</I> </SUP>, and Δ<I>E</I> <SUP> <I>*</I> </SUP> values. Low temperature degradation of the samples was evaluated by aging sensitivity tests in autoclave for 2, 4, and 6h. Results have shown that color produced depends on the kind and concentration of the colorant solution while time of immersion has no significant effect on coloring process. Coloring solutions containing 0.1 and 0.25wt% MoCl<SUB>3</SUB> provided clinically acceptable color with the ΔE* value ranging from 5.16 to 6.42 for dental applications.</P>

MoS2-Nanosheet/Graphene-Oxide Composite Hole Injection Layer in Organic Light-Emitting Diodes

박민준,NGUYEN PHAN THANG,최경순,박종이,Abdullah Ozturk,김수영 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.4

In this work, composite layers comprising two-dimensionalMoS2 and graphene oxide (GO) were employed as holeinjection layers (HILs) in organic light-emitting diodes(OLEDs). MoS2 was fabricated by the butyllithium (BuLi)intercalation method, while GO was synthesized by amodified Hummers method. The X-ray diffraction patternsshowed that the intensity of the MoS2 (002) peak at 14.15°decreased with increase in GO content; the GO (001) peakwas observed at 10.07°. In the C 1s synchrotron radiationphotoemission spectra, the contributions of the C-O, C=O, and O-C=O components increased with increase in GO content. These results indicated that GO was well mixed with MoS2. The lateral size of MoS2 spanned from a few hundreds ofnanometers to 1 μm, while the size of GO was between 400 nm and a few micrometers. Thus, the coverage of the MoS2-GOcomposite on the ITO surface improved as the GO content increased, owing to the large particle size of GO. Notably, GO withlarge size could fully cover the indium tin oxide film surface, thus, lowering the roughness. The highest maximum powerefficiency (PEmax) was exhibited by the OLED with MoS2-GO 6:4 composite HIL, indicating that similar contents of MoS2 andGO in MoS2-GO composites provide the best results. The OLED with GO HIL showed very high PEmax (4.94 lm W−1) becauseof very high surface coverage and high work function of GO. These results indicate that the MoS2-GO composites can be usedto fabricate HILs in OLEDs.

Effects of Graphene Transfer and Thermal Annealing on Anticorrosive Properties of Stainless Steel

Oh, Jeong Hyeon,Han, Sangmok,Kim, Tae-Yoon,Park, Jongee,Ozturk, Abdullah,Kim, Soo Young American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.11

<P>Stainless steel (STS) films were annealed in a thermal quartz tube and covered with graphene to improve their anticorrosive properties. Graphene was synthesized via the chemical vapor deposition method and transferred onto the surface of the STS film by the layer-by-layer approach. The structure of the STS film changed from alpha-Fe to gamma-Fe after annealing at 700 C for 1 h, resulting in an increase of 82.72% in the inhibition efficiency. However, one-layer graphene acted as a conductive pathway and therefore deteriorated the anticorrosive properties of the STS film. To overcome this problem, graphene was transferred layer by layer onto the STS film. It was found that transfer of three layers of graphene onto the STS film resulted in a 91.57% increase in the inhibition efficiency. Therefore, thermal annealing and transfer of multilayer graphene are considered to be effective in enhancing the anticorrosive properties of STS films.</P>

Control of the Crystal Growth Shape in CH₃NH₃PbBr₃ Perovskite Materials

Le, Quyet Van,Shin, Jong Wook,Jung, Jin-Hee,Park, Jongee,Ozturk, Abdullah,Kim, Soo Young American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.11

<P>CH3NH3PbBr3 (MAPbBr(3)) materials with perovskite structure were grown by a two-step process using Pb(CH3COO)(2). 3H(2)O and methyl amine bromide (MABr). By changing the concentration of MABr in isopropyl alcohol (IPA) solvent and the annealing temperature, the shape of CH3NH3PbBr3 materials can be controlled to afford nanocubes, nanowires, nanorods, and wrinkled structures. MAPbBr3 with single cubic structure was obtained at a MABr concentration of 3 mg/mL in IPA, and a nanorod array of MAPbBr3 was realized at a MABr concentration of 9 mg/mL in IPA at room temperature. Uniformly wrinkled shapes were formed after the synthesis temperature was increased to 60 and 90 degrees C. The X-ray diffraction patterns, Fourier transform infrared spectra, and X-ray photoelectron spectra of CH3NH3PbBr3 nanorods confirmed that the pure perovskite phase was obtained by dipping Pb(CH3COO)(2). 3H(2)O in MABr/IPA solution. The optical bandgap of the CH3NH3PbBr3 nanorods was estimated from the Tauc plot as 2.2 eV. The evolution of perovskite shapes is expected to lead to improvements in the electrical properties and surface contact, which are important factors for realizing high-performance devices.</P>

Eyelid Tumors: Clinical Data from an Eye Center in Ankara, Turkey

Gundogan, Fatih Cakir,Yolcu, Umit,Tas, Ahmet,Sahin, Omer Faruk,Uzun, Salih,Cermik, Hakan,Ozaydin, Sukru,Ilhan, Abdullah,Altun, Salih,Ozturk, Mustafa,Sahin, Fahri,Erdem, Uzeyir Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.10

Introduction: The aim of the study was to explore the distribution of eyelid tumors in Ankara, the capital city of Turkey, from a histopathological point of view. Materials and Methods: Medical records of 1,502 patients who had eyelid surgery because of tumoral lesions were retrospectively reviewed after obtaining institutional review board approval. A total of 1,541 lesions with histopathologic diagnosis were included. Inflammatory tumoral lesions were excluded. The lesions were categorized into three groups according to the origin: epidermal, adnexal tumors and 'others', including melanocytic, neural and vascular lesions. Results: Of the total of 1,541, 908 lesions were epidermal in origin. Only 22 (1.5%) were malignant, and 6.0% was premalignant lesions such as actinic keratosis and Bowen's disease. Twenty-one of 22 malignant lesions were basal cell carcinoma. There was only one patient with squamous cell carcinoma and no sebaceous cell carcinoma. Among the benign tumors (92.5%), squamous papilloma was the most frequent (21.8% of all lesions). The other frequent lesions were nevus (17.6%), seborrheic keratosis (17.3%), hydrocystomas (10.6%), xanthelasma (7.6%) and epidermal cysts (7.2%). Conclusions: The results of this study are in accordance with published literature. The absence of sebaceous cell carcinomas needs to be stressed.