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RISS 인기검색어
- 검색키워드
- 저자 : Ayse Gul (검색결과 7 건)
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AYSE GUL KOCAK ALTINTAS,Cagri Ilhan 대한안과학회 2019 Korean Journal of Ophthalmology Vol.33 No.3
Purpose: To evaluate the changes in visual acuity (VA) and central macular thickness (CMT) after intravitrealdexamethasone (IVD) implantation in intravitreal bevacizumab (IVB) treatment-resistant cases with pseudophakiccystoid macular edema (PCME). Methods: This study included 10 PCME cases who underwent uneventful phacoemulsification and intraocularlens implantation with similar methods and six PCME cases referred to our hospital for treatment oflow VA after cataract surgery. Due to the persistence of PCME, both topical steroid and anti-inflammatorymedication were administered first, followed by IVB injection. IVD implantation was performed for all IVBtreatment-resistant cases. VA and CMT values were compared before and at three months after the first IVDimplantation. Results: The mean VA values before and at 3 months after the first IVD implantation were 0.69 ± 0.19 logarithmof the minimum angle of resolution (logMAR) (1.50 to 0.10 logMAR) and 0.26 ± 0.07 logMAR (1.00 to 0.00logMAR), respectively (p < 0.001). The mean CMT was 476.13 ± 135.13 mm (314 to 750 mm) and 294.06 ±15.26 mm (222 to 480 mm), respectively (p < 0.001). The mean number of implanted IVD was 1.44 ± 0.89 (1to 4) and the mean follow-up time was 7.4 ± 4.6 months (6 to 24 months). After IVD implantation therapy, themean VA and CMT values were 0.19 ± 0.05 logMAR (0.70 to 0.00 logMAR) and 268.38 ± 31.35 mm (217 to351 mm), respectively. Conclusions: To the best of our knowledge, this is the first report to show the efficacy of IVD implantationeven after repeated IVB injections in treatment-resistant PCME. IVD implantation is both a safe and effectivemethod for decreasing PCME after both uneventful and complicated cataract surgery.
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Characteristics of nanocomposite films deposited by atmospheric pressure uniform RF glow plasma
Aysegul Uygun,Lutfi Oksuz,Ayse Gul Yavuz,Ali Guleç,Songul Sen 한국물리학회 2011 Current Applied Physics Vol.11 No.2
Characteristics of nanocomposite films synthesized and deposited by atmospheric pressure Radio-Frequency (RF) (13.56 MHz) uniform glow discharge are examined. The nanocomposite thin film deposition is carried out in the presence of titanium dioxide (TiO_2) with polymerization of pyrrole,thiophene and furan monomers in acetonitrile medium containing lithium perchlorate (LiClO_4). The chemical, morphological, thermal and electrical characteristics of polypyrrole/TiO_2 (PPy/TiO_2), polythiophene/TiO_2 (PT/TiO_2) and polyfuran/TiO_2 (PF/TiO_2) composites are examined by FTIR spectroscopy,scanning electron microscopy-energy dispersive X-ray analysis (SEM-EDX), atomic force microscopy (AFM), thermogravimetry (TGA) and four-probe conductivity measurements. The presence of PT bands in the FTIR spectra of PT/TiO_2 indicates that plasma polymerization did not cause thiophene ring opening as was reported in the literature. The thermograms indicate that the PPy/TiO_2 composite has the best thermal stability, whereas PT/TiO_2 has the best electrical conductivity. Morphology studies reveal that the composite film deposition occurs uniformly through polymerization of the monomer onto TiO_2nanoparticles.
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Evaluation of Invasive and Noninvasive Methods for the Diagnosis of Helicobacter Pylori Infection
Cosgun, Yasemin,Yildirim, Abdullah,Yucel, Mihriban,Karakoc, Ayse Esra,Koca, Gokhan,Gonultas, Alpaslan,Gursoy, Gul,Ustun, Huseyin,Korkmaz, Meliha Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.12
Objective: The present study was conducted to evaluate invasive and noninvasive diagnostic methods for detection of Helicobacter pylori (H. pylori) in patients admitted with dyspeptic complaints and to compare sensitivities and specificities. Method: Sets of four gastric biopsy specimens were obtained from a total of 126 patients included in the study. The presence of H. pylori was determined by invasive tests including culture, rapid urease test, polymerase chain reaction (PCR) and histopathology. Among noninvasive tests, urea breath test, serological tests and enzyme-linked immunosorbent assay (ELISA) were performed. Results: H. pylori was isolated in 79 (62.7%) gastric biopsy cultures, whereas positivity was concluded for 105 (83.3%) patients by rapid urease test, for 106 (84.1%) by PCR, for 110 (87.3%) by histopathology, for 119 (94.4%) by urea breath test, and for 107 (84.9%) by ELISA. In the present study, the culture findings and histopathological examination findings were accepted as gold standard. According to the gold standard, urea breath test had the highest sensitivity (96.5%) and the lowest specificity (30%), whereas culture and histopathology had the highest specificities (100%). Conclusion: The use of PCR invasively with gastric biopsy samples yielded parallel results with the gold standard. PCR can be recommended for routine use in the diagnosis of H. pylori.
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Aysegul Uygun,Orhan Turkoglu,Songul Sen,Ersay Ersoy,Ayse Gul Yavuz,Gokhan Guven Batir 한국물리학회 2009 Current Applied Physics Vol.9 No.4
A composite of polythiophene (PT) and nano-titanium dioxide (TiO2), possessing core–shell structure, was synthesized via oxidative polymerization of thiophene using FeCl3 in the presence of three different surfactants: anionic, cationic, and nonionic. The morphology of the obtained composite materials was investigated by SEM, proving the core–shell structure of the prepared nanocomposite. The formation and thermal stability of the PT onto TiO2 nanoparticles were confirmed by FTIR and TGA analyses, respectively. XRD data show all of composite materials were amorphous structures. The electrical properties of the nanocomposites were investigated in the presence of surfactant materials, and the best semiconductor property was observed for PT/TiO2-anionic system. This difference in the conductivity has been attributed to differences in the stability of the composites. A composite of polythiophene (PT) and nano-titanium dioxide (TiO2), possessing core–shell structure, was synthesized via oxidative polymerization of thiophene using FeCl3 in the presence of three different surfactants: anionic, cationic, and nonionic. The morphology of the obtained composite materials was investigated by SEM, proving the core–shell structure of the prepared nanocomposite. The formation and thermal stability of the PT onto TiO2 nanoparticles were confirmed by FTIR and TGA analyses, respectively. XRD data show all of composite materials were amorphous structures. The electrical properties of the nanocomposites were investigated in the presence of surfactant materials, and the best semiconductor property was observed for PT/TiO2-anionic system. This difference in the conductivity has been attributed to differences in the stability of the composites.
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