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( Ergenekon Karagoz ),( Alpaslan Tanoglu ),( Asim Ulcay ),( Veysel Ozalper ),( Vedat Turhan ),( Muammer Kara ),( Levent Gorenek ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Background: The neutrophil to lymphocyte ratio (NLR), an infi ammation index, has been suggested to predict prognosis of various infi ammatory and neoplastic diseases. However, there are only a few studies examining the relationship between NLR and liver fi brosis score in HBV infected cases in literature. In this study, we aimed to determine the relationship between neutrophil to lymphocyte ratio (NLR) and fi brosis level. Methods: 144 biopsy proven naive chronic hepatitis B cases and 42 healthy subjects were included in the study. Previously treated patients by antiviral therapy and patients with anti-Delta positive were excluded from the study. Hepatitis B patients were divided into two groups with fi brosis scores of 0-1 and 2-6 according to ISHAC score. Results: Of the 144 cases, 125 (86.9 %) were male, 19 (13.1%) were female. fibrosis scores of 84 cases (58.3 %) were = 2 while 60 cases had fi brosis scores < 2 (41.7 %). There was a significant difference between Naive chronic hepatitis B group and healthy subjects in terms of NLR.The mean serum NLR was 1.822±0.853 in chronic hepatitis B patient group while it was found to be 2.29±1.408 in healthy subjects (p<0,05).There was not a signifi cant correlation existed between fi brosis score and NLR. NLR level was 1,906±1.027 in patients with fi brosis score 0-1 while this level was 1.762±0.702 in patients with fi brosis score 2-6 (p=0,576). Conclusions: In comparisons of healthy subjects with Hepatitis B infected patients, NLR was found to be lower in patients with Hepatitis B. Further studies are needed to determine the relationship between NLR and Hepatitis B.
Immunoregulatory Function of HLA-G in Gastric Cancer
Tuncel, Tolga,Karagoz, Bulent,Haholu, Aptullah,Ozgun, Alpaslan,Emirzeoglu, Levent,Bilgi, Oguz,Kandemir, Emin Gokhan Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.12
Background: Human leukocyte antigen (HLA)-G-positive gastric cancers are associated with poor survival, but links with tumor escape mechanisms remain to be determined. Materials and Methods: We used immunohistochemistry to investigate HLA-G expression, tumor infiltrating CD8+ T lymphocytes, and Treg cells in 52 gastric cancer patients. Results: There were 29 cancer-related deaths during the follow-up period. Kaplan-Meier analysis indicated that patients with HLA-G-positive (n=16) primary tumors had a significantly poorer prognosis than patients with HLA-G-negative tumors (n=36, p=0.008). The median survival time was 14 months and 47 months, respectively. Patients with high numbers of Tregs and low numbers of CD8+T lymphocytes in the primary tumor had a poorer prognosis than those with low numbers of Tregs and high numbers of CD8+T lymphocytes (p=0.034, p=0.043). Multivariate Cox proportional hazard regression analysis showed that HLA-G expression (hazard ratio: 2.662; 95% confidence interval: 1.242-5.723; p=0.012) and stage (hazard ratio: 2.012;95% confidence interval: 1.112-3.715; p=0.041) were independent unfavorable factors for patient survival. Conclusions: We found a significant positive correlation between HLA-G expression and the number of tumor infiltrating Tregs (p=0.01) and a negative correlation with the number of CD8+T lymphocytes (p=0.041). HLA-G may protect gastric cancer cells from cytolysis by inducing Foxp3+Treg lymphocytes and suppressing CD8+T lymphocytes.
Clinicopathological Features and Survival of Young Turkish Patients with Testicular Germ Cell Tumors
Ozgun, Alpaslan,Karagoz, Bulent,Tuncel, Tolga,Emirzeoglu, Levent,Celik, Serkan,Bilgi, Oguz Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.11
Background: Testicular germ cell tumors (TGCTs) are a relatively common malignancy in young men. The aim of this study was to investigate the clinicopathological features and survival of young Turkish patients with TGCT. Materials and Methods: In this retrospective study, the clinical and pathological characteristics of young Turkish patients with TGCT who were monitored by the Department of Medical Oncology of a military hospital between 2008 and 2013 were investigated. Overall survival data were analyzed. Results: Ninety-six patients were included in the study. The mean age was 26.4 years. Among the patients, 17.7% had seminoma and 43.8% had mixed non-seminomatous germ cell tumors. Some 46.9% were Stage I, 30.2% were Stage II, and 22.9 were Stage III. Of the patients, 83.3% received chemotherapy, 25% underwent retroperitoneal lymph node dissection (RPLND), 3.1% received radiotherapy, and 12.5% were followed-up without treatment. In addition, 18.8% of the patients were administered salvage chemotherapy due to relapse or progression. The 5-year overall survival rate was 90.2% for all patients. The 2-year overall survival rate was 100% for Stage I patients, 94% for Stage II patients, and 70.2% for Stage III patients. The difference between the survival curves of stages was statistically significant (p=0.029). Conclusions: In young Turkish patients with TGCT, good results were obtained with appropriate treatment, most receiving chemotherapy. The prognosis of the disease was good even in the advanced stage.
Shear bond strength of resin cement to an acid etched and a laser irradiated ceramic surface
Kursoglu, Pinar,Karagoz Motro, Pelin Fatma,Yurdaguven, Haktan The Korean Academy of Prosthodonitics 2013 The Journal of Advanced Prosthodontics Vol.5 No.2
PURPOSE. To evaluate the effects of hydrofluoric acid etching and Er,Cr:YSGG laser irradiation on the shear bond strength of resin cement to lithium disilicate ceramic. MATERIALS AND METHODS. Fifty-five ceramic blocks ($5mm{\times}5mm{\times}2mm$) were fabricated and embedded in acrylic resin. Their surfaces were finished with 1000-grit silicon carbide paper. The blocks were assigned to five groups: 1) 9.5% hydrofluoric-acid etching for 60 s; 2-4), 1.5-, 2.5-, and 6-W Er,Cr:YSGG laser applications for 60 seconds, respectively; and 5) no treatment (control). One specimen from each group was examined using scanning electron microscopy. Ceramic primer (Rely X ceramic primer) and adhesive (Adper Single Bond) were applied to the ceramic surfaces, followed by resin cement to bond the composite cylinders, and light curing. Bonded specimens were stored in distilled water at $37^{\circ}C$ for 24 hours. Shear bond strengths were determined by a universal testing machine at 1 mm/min crosshead speed. Data were analyzed using Kruskal-Wallis and Mann-Whitney U-tests (${\alpha}$=0.05). RESULTS. Adhesion was significantly stronger in Group 2 ($3.88{\pm}1.94$ MPa) and Group 3 ($3.65{\pm}1.87$ MPa) than in Control group ($1.95{\pm}1.06$ MPa), in which bonding values were lowest (P<.01). No significant difference was observed between Group 4 ($3.59{\pm}1.19$ MPa) and Control group. Shear bond strength was highest in Group 1 ($8.42{\pm}1.86$ MPa; P<.01). CONCLUSION. Er,Cr:YSGG laser irradiation at 1.5 and 2.5 W increased shear bond strengths between ceramic and resin cement compared with untreated ceramic surfaces. Irradiation at 6 W may not be an efficient ceramic surface treatment technique.
Kondratyuk, Petro,Karagoz, Burcu,Yun, Yongju,Gellman, Andrew J. American Chemical Society 2019 The Journal of Physical Chemistry Part C Vol.123 No.31
<P>Surface explosion reactions have highly nonlinear reaction kinetics that exhibit autoacceleration under isothermal conditions. These can lead to phenomena such as oscillatory surface reaction rates and to highly enantiospecific reactions of chiral adsorbates on chiral surfaces. Tartaric acid (TA) decomposes on Cu surfaces by an explosion mechanism that is propagated by vacancies, empty adsorption sites that self-replicate autocatalytically during TA decomposition. Surface explosion kinetics result from chain-branching steps in which one vacancy decomposes an adsorbate to yield two vacancies. In the absence of vacancies, surface explosions cannot occur; they require some initiation step that creates vacancies. By comparison with the chain-branching explosion step, little is known about the processes that initiate or nucleate surface explosion reactions. Time-resolved XPS measurements during the early stages of explosion initiation of TA/Cu(<I>hkl</I>) reveal a process that involves direct loss of TA from the surface to create the initial vacancies. In the presence of a gas phase flux to the surface, such vacancy nuclei can be repopulated to suppress the onset of explosion. Measurements on 18 different Cu(<I>hkl</I>) surface orientations demonstrate that the kinetics of the initiation process are structure-insensitive. This implies that the highly enantiospecific TA decomposition kinetics observed on chiral Cu(<I>hkl</I>) surfaces must arise from the structure sensitivity of the chain-branching explosion kinetics.</P> [FIG OMISSION]</BR>
Merve Biyikl,Taner Karagoz,Metin Calli,Talha Muslim,A. Alper Ozalp,Ali Bayram 대한금속ᆞ재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
Laser metal deposition (LMD) is an additive manufacturing process used in manufacturing freeform geometries, repairapplications, coating and surface modification, fabrication of functionally graded materials. It has a broad range of applicationsin various industries, including aviation, space, defence, automotive, tooling, etc. In this work, a multi-physics modelof the LMD process was developed to rapidly predict the geometrical characteristics of the single clad track using the commercialsoftware package Flow-3D. The volume of fluid (VOF) method was integrated to differentiate the interface betweenthe metallic and gaseous cells. To validate the numerical model single bead tracks were deposited, and cross-sections of thebeads were analysed. Mathematical formulae to predict different aspects of the single clad track (height, width, and depth)were derived using regression analysis. The influence of the process parameters on the geometrical characteristics of thesingle clad track was analysed in detail using analysis of variance (ANOVA). Both multi-physics model and mathematicalregression model results were compared to the experimental measurements. The results were in good agreement with theexperimental results.
Gulay Bayramoglu,Bunyamin Karagoz,M. Yakup Arica 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.60 No.-
A novel support material containing cyclic carbonate group for facile enzyme immobilization was synthesized from [poly(styrene-co-divinylbenzene)-graft-poly(glycidyl methacrylate)] “[PS-co-DVB-g-P(GMA)]” microsphere under carbon dioxide atmosphere. It was named as (poly(styrene-co-divinylbenzene)-graft-poly(cyclic-carbonate methacrylate)] “[PS-co-DVB-g-P(CCMA)]” microsphere. Laccase was covalently immobilized using the microspheres carrying cyclic epoxy and cyclic carbonate groups. The amount of enzyme loading on the cyclic carbonate groups of the microspheres was 47.8 mg/g. The immobilized enzyme was used for degradation of Bisphenol A, and Congo Red dye in packed bed reactor. The immobilized laccase preserved its initial activity about 67.5% and 93.0% for degradation of Bisphenol A and Conge Red, respectively.