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Öğe Analysis of Poly (2-Hydroxyethyl Methacrylate)-co-Poly (4-Vinyl Pyridine) Copolymers [COP2,4] Irradiated: an EPR study(POLISH ACAD SCIENCES INST PHYSICS, 2016) Ceylan, Y.; Aydogmus, H. Yumurtaci; Usta, K.; Usta, A.; Ceylan, N.; Yilmaz, H.Poly(2-hydroxyethyl methacrylate)-co-poly(4-vinyl pyridine) and poly(HEMA)-co-poly-(4-VP) copolymers were synthesized by free radical polymerization. K2S2O8 was used as an initiator. Chain lengths of the copolymer was changed by varying the monomer/initiator ratio. These polymers have molarites of 2.6 and 2.1 respectively and are called COP2 and COP4. The samples were exposed to gamma rays at room temperature. After irradiation, the EPR spectra of COP2 and COP4 were recorded between 120 K and 450 K. From the temperature dependence of the line intensity, it was concluded that unpaired spin concentration in the irradiated samples has been changing with temperature. A theoretical study, presented in this report, was aimed to test success of the machine learning methods and to select the best learning method.Öğe Comparison of diphenhydramine and lidocaine for prevention of pain after injection of propofol: a double-blind, placebo-controlled, randomized study(LIPPINCOTT WILLIAMS & WILKINS, 2007) Apiliogullari, S.; Keles, B.; Apiliogullari, B.; Balasar, M.; Yilmaz, H.; Duman, A.Background and objective: Pain on injection is still a problem with propofol. The purpose of the study was to compare the effectiveness of diphenhydramine and lidocaine on pain caused by propofol at the site of injection. Methods: One hundred and eighty ASA I-II adults undergoing elective surgery were randomly assigned into three groups of 60 each. Group I (placebo) received 2 mL normal saline, Group 11 received 2 mL (40 mg) 2% lidocaine and Group III received 2 mL (20 mg) diphenhydramine intravenously (i.v.) during a 1-min venous occlusion, followed by propofol into a cephalic forearm vein of the antecubital fossa. Pain assessment was made immediately after propofol injection. Results: In the placebo group 25 (41.7%) patients experienced pain during propofol injection as compared to 2 (3.3%) and 3 (5.0%) in the lidocaine and diphenhydramine groups, respectively. The prevalence of pain and pain score were significantly less in both the lidocaine and diphenhydramine groups than in the placebo group (P = 0.00). No difference was found between the diphenhydramine and lidocaine groups (P = 0.60). Conclusion: Previous injection of diphenhydramine with venous occlusion can be considered as an alternative to lidocaine for reducing the prevalence of pain caused by injection of propofol into peripheral veins.Öğe The effect of obesity surgery on ghrelin levels(WILEY, 2017) Ayranci, M.; Vatansev, H.; Saracligil, B.; Tekin, G.; Yilmaz, H.; Vatansev, H.[Abstract not Available]Öğe Hand-assisted Laparoscopic Sleeve Gastrectomy(SPRINGER, 2013) Sahin, M.; Yilmaz, H.; Alptekin, H.; Acar, F.; Kafali, E.; Calisir, A.[Abstract not Available]Öğe Incisional Hernia Rate May Increase After Single-Port Cholecystectomy(Mary Ann Liebert Inc, 2012) Alptekin, H.; Yilmaz, H.; Acar, F.; Kafali, M. E.; Sahin, M.Background: The major concerns of single-port cholecystectomy are port-site hernia and cost. Essentially, a larger transumbilical incision is more likely to increase the incidence of incisional hernia. The effect of single-port cholecystectomy on hospital cost is controversial. This study evaluated single-port cholecystectomy and traditional four-port cholecystectomy with respect to perioperative outcomes, hospital cost, and postoperative complications. Patients and Methods: Between January 2010 and March 2011, 52 patients underwent single-port cholecystectomy, and 111 patients underwent traditional laparoscopic cholecystectomy. We used equal instruments in patients undergoing operation with the same surgical technique. Demographics, diagnosis, operative data, complications, length of hospital stay, and cost were compared between the two groups. Results: The patients undergoing laparoscopic cholecystectomy were significantly older than patients undergoing single-port cholecystectomy (55.8 +/- 13.8 years versus 48.7 +/- 12.7 years, P = .002). The trocar site hernia rate was 1.8% in laparoscopic cholecystectomy, and the port-site hernia rate was 5.8% in single-port cholecystectomy. This is the highest rate reported in the literature for port-site hernia following single-port cholecystectomy. Surgical techniques were not different in terms of conversion to open surgery, postoperative hospital stay, and operative time. The relative cost of single-port cholecystectomy versus laparoscopic cholecystectomy was 1.54. Conclusions: Although single-port cholecystectomy seems to be a feasible surgical technique, it is not superior over the traditional laparoscopic cholecystectomy. Single-port cholecystectomy is equal to laparoscopic cholecystectomy with respect to conversion to open surgery, postoperative hospital stay, and operative time, but it is associated with high hospital cost and high port-site hernia rate.Öğe Revisional Bariatric Surgery(SPRINGER, 2013) Sahin, M.; Alptekin, H.; Yilmaz, H.; Acar, F.; Kafali, E.; Surucu, G.[Abstract not Available]