Comparative Analysis of Vertebroplasty and Kyphoplasty for Osteoporotic Vertebral Compression Fractures

Melih Bozkurt,Gokmen Kahilogullari,Mevci Ozdemir,Onur Ozgural,Ayhan Attar,Sukru Caglar,Can Ates 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.1

Study Design: A retrospective study. Purpose: The aim of this study is to compare the efficacy and outcome of vertebroplasty compared with unipedicular and bipedicular kyphoplasty for the treatment of osteoporotic vertebral compression fractures in terms of pain, functional capacity and height restoration rates. Overview of Literature: The vertebroplasty procedure was first performed in 1984 for the treatment of a hemangioma at the C2 vertebra. Kyphoplasty was first performed in 1998 and includes vertebral height restoration in addition to using inflation balloons and high-viscosity cement. Both are efficacious, safe and long-lasting procedures. However, controversy still exists about pain relief, improvement in functional capacity, quality of life and height restoration the superiority of these procedures and assessment of appropriate and specific indications of one over the other remains undefined. Methods: Between 2004 and 2011, 296 patients suffering from osteoporotic vertebral compression fracture underwent 433 vertebroplasty and kyphoplasty procedures. Visual analogue scale (VAS), the Oswestry Disability Index (ODI) and height restoration rates were used to evaluate the results. Results: Mean height restoration rate was 24.16%±1.27% in the vertebroplasty group, 24.25%±1.28% in the unipedicular kyphoplasty group and 37.05%±1.21% in the bipedicular kyphoplasty group. VAS and ODI scores improved all of the groups. Conclusions: Vertebroplasty and kyphoplasty are both effective in providing pain relief and improvement in functional capacity and quality of life after the procedure, but the bipedicular kyphoplasty procedure has a further advantage in terms of height restoration when compared to unipedicular kyphoplasty and vertebroplasty procedures.

PEG crosslinked poly(vinylbenzene boronic acid) polymer electrolytes for Li-ion batteries

Sevim Ünügür Çelik,Ayhan Bozkurt 한국물리학회 2013 Current Applied Physics Vol.13 No.8

Poly(4-vinylbenzeneboronic acid), PVBBA was synthesized via free-radical polymerization of 4-vinylbenzeneboronic acid (4-VBBA) and followed by crosslinking with polyethylene glycol (PEG) with different molecular weights to produce boron containing crosslinked polymers. Prior to crosslinking, the materials were doped with CF3SO3Li at several stoichiometric ratios to get PVBBAPEGX-Y where X is the molecular weight of PEG and Y is the EO/Li ratio. The materials were characterized by using Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and differential scanning calorimeter (DSC). The ionic conductivity of these novel crosslinked electrolytes was studied by dielectric-impedance spectroscopy. Li-ion conductivity of these polymer electrolytes depends on the length of the side units as well as the doping ratio. PVBBAPEG200-10 illustrated a satisfactory ionic conductivity of 3.1 x 10-5 S/cm at 20 ℃ and 1.8 x 10-3 S/cm at 100 ℃

Highly robust multilayer nanosheets with ultra-efficient batch adsorption and gravity-driven filtration capability for dye removal

Arfa Iqbal,Emre Cevik,Omar Alagha,Ayhan Bozkurt 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-

This study reports the removal of methylene blue dye (MB) from aqueous solutions by ultra-efficientbatch adsorption and membrane filtration using novel nitrogen-doped multilayer molybdenum carbideand molybdenum oxide nanosheets (NMoC@Mo). During batch adsorption studies, a complete MB dyeremoval (99.8%) was achieved against considerably high dye concentration (200 ppm) in a very shortduration (7 min) using 4 mg of adsorbent dose. The equilibrium studies confirmed that the adsorptiondata followed Langmuir adsorption isotherm with a maximum monolayer coverage adsorbent capacityof 204 mg g1. Reusability study of the NMoC@Mo nanosheets revealed that the adsorption (96%) /desorption(90%) efficiency of the adsorbent remained very high upto five consecutive cycles. the A costeffectivegravity driven membrane filtration studies were performed without applying any external pressure. Membranes (M-10, M-40, and M-60) containing three different loadings of NMoC@Mo (10 mg,40 mg, and 60 mg, respectively) into the polyvinyl difluoride (PVDF) doped solutions were exhibited amaximum dye removal of almost 85% achieved with M-40 membrane. Moreover, M-40 membrane exhibitedimproved hydrophilicity (contact angle: 79.94), water flux (53.35 L/m2-h), and improved antifoulingproperties. The results supported the immense potential and economic feasibility of NMoC@Mo in MBdye removal using both adsorption and membrane filtration processes.

Dielectric and proton conductivity studies in organic electrolytes based on 2-perfluoroalkyl-ethyl-azides

Sedat Cos gun,Sevim Ünügür Çelik,Abdulhadi Baykal,Ayhan Bozkurt 한국물리학회 2010 Current Applied Physics Vol.10 No.1

Intrinsically proton conducting organic electrolytes based on 2-perfluoroalkyl-ethyl-azides were synthesized via 1,3 cycloaddition between 2-perfluoroalkyl-ethyl-azide and alkynes. FT-IR, elemental analysis and NMR methods were used to characterize the resulting organic electrolytes. Thermal properties were analyzed with thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) and the morphology of the organic electrolytes was studied with X-ray diffraction (XRD). The effect of chain length on proton conductivity was investigated with impedance spectrometer. Dielectric constant and electrical modulus formalisms were analyzed and the maximum proton conductivity was measured as 10-2 mS/cm at 180 ℃.

Synthesis and Physical Properties of Proton Conducting Polymer Electrolytes Comprising PAM Cross-Linked Flexible Spacers

Seyda Tugba Gunday,M. A. Almessiere,Hamide Aydın,Ayhan Bozkurt 한국고분자학회 2019 Macromolecular Research Vol.27 No.7

The design of novel proton exchange membranes with high conductivity and better dimensional stability has become increasingly important due to the need for applications in different devices. The present work shows the acid-doped and crosslinked polyacrylamide (PAM) networks including flexible spaces. To this end PAM was modified with 1,4-butanediol diglycidyl ether (BG) to form PAM35BG and PAM50BG networks, which would afford more space for protonated solvents. The reaction of PAM with BG was monitored by FTIR and 13C CP-MAS NMR. The polymer electrolytes were produced by acid doping at several stoichiometric ratios with respect to the monomer repeat unit of a host polymer. The resulting materials exhibited better thermal, chemical, and electrochemical stabilities and had distinct T g values. Additionally, the pores of the PAM-BG materials were filled with H3PO4 to get PAM35BG0.5H3PO4 and PAM50BG1.0H3PO4. The doping enhanced the proton conductivities of the membranes as high as 0.003 S/cm at 120 oC under an anhydrous atmosphere. The proton diffusion mechanism and the dielectric relaxation were further examined using the complex modulus formalism, M*.

Symmetric Supercapacitor Application of Anhydrous Gel Electrolytes Comprising Doped Tetrazole Terminated Flexible Spacers

Seyda T. Gunday,Emre Cevik,Ismail Anil,Omar Alagha,Hussein Sabit,Ayhan Bozkurt 한국고분자학회 2020 Macromolecular Research Vol.28 No.12

The current research aimed to produce anhydrous gel organic electrolytes with superior performance for high-temperature supercapacitor applications. Within this scope, anhydrous electrolytes were designed by the termination of 1,4- butanediol diglycidyl ether (BDE) with 5-aminotetrazole (AT). The BDE(AT)2 was further doped with phosphoric acid (PA) and 1-Ethyl-3-methylimidazolium tetrafluoroborate (EMT, as an ionic liquid) at varied ratios. The structure of fabricated electrolytes was elucidated with various spectroscopic techniques, and thermal studies confirmed high thermal stabilities and low glass transition temperatures, suggesting that they could be used in a wide temperature range. Different supercapacitor systems, in combination with carbon-based electrodes and BDE(AT)2, BDE(AT)2-0.1EMT, and BDE(AT)2-PA-0.1EMT electrolytes, were constructed. The supercapacitor device in combination with BDE(AT)2-PA-0.1EMT electrolyte, showed the highest ionic conductivity value of 1.2×10-4 S cm-1. The electrode/electrolyte combination demonstrated a maximum specific capacitance (80.4 F g-1), the highest specific energy (2.91 Wh kg-1), and highly effective electrochemical reversibility (up to 2.250 cycles). The supercapacitor device illustrated a better performance at higher temperatures in terms of its specific capacitance value.

Neutrophil Lymphocyte Ratio as a Predictor of Left Ventricular Apical Thrombus in Patients with Myocardial Infarction

Ahmet Goktug Ertem,Filiz Ozcelik,Haci Ahmet Kasapkara,Cemal Koseoglu,Serdal Bastug,Huseyin Ayhan,Cenk Sari,Nihal Akar Bayram,Emine Bilen,Tahir Durmaz,Telat Keles,Engin Bozkurt 대한심장학회 2016 Korean Circulation Journal Vol.46 No.6

Background and Objectives: In this study, we examined the role of inflammatory parameters in an apical mural thrombus with a reduced ejection fraction due to large anterior myocardial infarction (MI). Subjects and Methods: A total of 103 patients who had suffered from heart failure, 45 of whom had left ventricular apical thrombus (AT) after a large anterior MI, were enrolled in the study. A detailed clinical history was taken of each participant, biochemical inflammatory markers, which were obtained during admission, were analyzed and an echocardiographical and angiographical evaluation of specific parameters were performed. Results: There were no statistically significant differences in terms of age, gender, and history of hypertension, diabetes mellitus, and atrial fibrillation between both groups (p>0.05). Similarly there were no statistically significant differences in terms of biochemical and echocardiographic parameters (p>0.05). However, there were significant differences in terms of neutrophil lymphocyte ratio (p=0.032). After a multivariate regression analysis, neutrophil lymphocyte ratio (NLR) was an independent predictor of thrombus formation (ß: 0.296, p=0.024). The NLR >2.74 had a 78% sensivity and 61% specifity in predicting thrombus in patients with a low left ventricular ejection fraction. Conclusion: In this study, neutrophil lymphocyte ratios were significantly higher in patients with apical thrombus.