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- 저자 : Hazer, Baki (검색결과 4 건)
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( Derya Burcu Hazer ),( Arsal Acarbas ),( Hans Eric Rosberg ) 대한통증학회 2018 The Korean Journal of Pain Vol.31 No.2
Background: Patients with lumbar disc herniation are treated with physiotherapy/medication and some with surgery. However, even after technically successful surgery some develop a failed back syndrome with persistent pain. Our aim was to evaluate the efficacy of epiduroscopy in patients who suffer chronic low back pain and/or radicular pain with or without surgery and the gender difference in outcome. Methods: A total of 88 patients were included with a mean age of 52 years (27-82), 54 women and 34 men. 66 of them were operated previously and 22 were non-operated. They all had persistent chronic back pain and radicular pain despite of medication and physical rehabilitation. Visual Analog Scale (VAS) for pain and Oswestry Disability Index (ODI) were evaluated preoperatively, after one month, six months and one-year after the epiduroscopy. Results: All patients, and also the subgroups (gender and operated/non-operated) improved significantly in pain (VAS) and disability (ODI) at one month. A significant improvement was also seen at one year. No differences were found between men and woman at the different follow-up times. A slight worsening in VAS and ODI was noticed over time except for the non-operated group. Conclusions: Epiduroscopy helps to improve the back and leg pain due to lumbar disc herniation in the early stage. At one year an improvement still exists, and the non-operated group seems to benefit most of the procedure. (Korean J Pain 2018; 31: 109-15)
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Grafting of poly(3-hydroxyalkanoate) and linoleic acid onto chitosan
Arslan, Hü,lya,Hazer, Baki,Yoon, Sung C. Wiley Subscription Services, Inc., A Wiley Company 2007 Journal of applied polymer science Vol.103 No.1
<P>Poly(3-hydroxy octanoate) (PHO), poly(3-hydroxy butyrate-co-3-hydroxyvalerate) (PHBV), and linoleic acid were grafted onto chitosan via condensation reactions between carboxylic acids and amine groups. Unreacted PHAs and linoleic acid were eliminated via chloroform extraction and for elimination of unreacted chitosan were used 2 wt % of HOAc solution. The pure chitosan graft copolymers were isolated and then characterized by FTIR, <SUP>13</SUP>C-NMR (in solid state), DSC, and TGA. Microbial polyester percentage grafted onto chitosan backbone was varying from 7 to 52 wt % as a function of molecular weight of PHAs, namely as a function of steric effect. Solubility tests were also performed. Graft copolymers were soluble, partially soluble or insoluble in 2 wt % of HOAc depending on the amount of free primary amine groups on chitosan backbone or degree of grafting percent. Thermal analysis of PHO-g-Chitosan graft copolymers indicated that the plastizer effect of PHO by means that they showed melting transitions T<SUB>m</SUB>s at 80, 100, and 113°C or a broad T<SUB>m</SUB>s between 60.5–124.5°C and 75–125°C while pure chitosan showed a sharp T<SUB>m</SUB> at 123°C. In comparison of the solubility and thermal properties of graft copolymers, linoleic acid derivatives of chitosan were used. Thus, the grafting of poly(3-hydroxyalkanoate) and linoleic acid onto chitosan decrease the thermal stability of chitosan backbone. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103:81–89, 2007</P>
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Atakan Toprak,Baki Hazer 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
Carbon materials with economic and high adsorption capacity attract much attention to reducing fossilfuel and industrial CO2 emissions. For this purpose, porous hollow spheres with high surface area andmicropore volume, morphologically resembling fullerene or soccer balls, were first produced from thesynthesized polystyrene by hydrothermal and conventional activation. The highest micropore volumeand BET surface area were found in PS-hydroHCl with 0.61 cm3/g and 1481 m2/g, respectively. TheCO2 adsorption capacities of PS-hydroHCl at 0 and 25 C were relatively high and were obtained as6.25 and 3.62 mmol/g, respectively. It was determined that all microporous spheres were influential inthe isosteric heat of adsorption range of 17–26 kJ/mol, that is, typical CO2 physical adsorption. It has beenfound that hydrothermally synthesized PS-hydro and PS-hydroHCl contain higher amounts of oxygenthan PS and PSHCl produced according to the conventional method. In addition, CO2/N2 selectivity at25 C, PS-hydroHCl, was three times more effective than PSHCl. As a result, it can be said that the synthesisof porous hollow microspheres is simple, and the starting material (polystyrene) is cheap and abundant;high CO2 adsorption and effective CO2/N2 selectivity will be promising for industrial applications.
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