Eserleri kadar eski bir müze

Taha Toros Arşivi, Dosya No: 114-Müzelerİstanbul Kalkınma Ajansı (TR10/14/YEN/0033) İstanbul Development Agency (TR10/14/YEN/0033

The Role of Customer Experience for Re-Visit and Purchase Intention: A Case Study of Amazon

In this study, it is aimed to examine the relationship between customer experience and re-visit intention, and purchase intention in e-commerce sites in the example of amazon.com.tr. The questionnaire form prepared to collect data within the scope of the research was shared on the internet. Descriptive statistical analysis and regression analysis were performed with the data obtained from 358 participants who answered the questionnaire. As a result of the analysis, it was found that customer experience has significant effects on purchase intention and re-visit intention, as well as purchase intention on re-visit intention

Heat transfer in steady-periodic flows over heated microwires

Effects of Reynolds number (Re), nondimensional drive frequency (Srp) and amplitude of yoscillations in the flow on the heat transfer coefficient and its frequency response characteristics for oscillatory flows over a micro wire are presented here. Time-averaged Nusselt numbers (Nu) at the stagnation point and averaged over the cylinder are calculated for Re = 10, 30 and 50, .001 < Srp < 1., and oscillation amplitudes, Vp, of 0.1 and 0.2 (for Re = 50). We used a formulation that allows decomposition of the flow into mean and periodic components, and used finite-element simulations to solve for the mean flow over the cylinder. Periodic component of the flow contributes to an artificial body force in the Navier-Stokes equation. According to our simulations, time-averaged Nusselt numbers are not strongly affected by oscillations. Largest increase in the time-averaged average Nu is only 3% larger than its unforced value. Nusselt oscillations have multiple modes and we used Fourier Transform to identify each mode and calculate its corresponding amplitude. The mode for which the frequency is twice as much as the driving frequency is the dominant mode for Srp up to 0.1 for all Reynolds numbers studied here. For larger drive frequencies, the second mode dies off; for Re = 30 and 50 amplitude of the first mode at the drive frequency takes over. For large drive frequencies (Srp~1) all modes tend to diminish

Bonesetter choice of Turkish society in musculoskeletal injuries and the affecting factors

Objective: In this study, it was aimed to investigate the demographic features, administration reasons and educational status of the patients who were presented to the bonesetters for orthopedic complaints. Methods: 96 (26 males, 70 females) patients were included in this study, who filled a questionnaire out of 1926 patients went to bonesetters between June and December 2012. All the patients were recorded regarding demographic features, first application places, educational status, administration reasons, and complication rates. Results: 87 patients (90.6%) preferred bonesetters as the first application place. The mean age of the patients was 31±16.1 years. The most common reason was advices of the family members or relatives (40.6%). The educational status was not significant in administration rate, but low educational status has significant correlation with more complication rates. Sixteen patients developed sequels (16.6%). The effect of bonesetters’ treatment was mostly found to be placebo. Conclusion: Bonesetter is a country reality when prevalence was taken in notice. However, the similarity of their results to placebo ones, having no education, having no legal rights, paying no tax make this issue a great problem. The solution of this problem is depended to increase health programs to inform public and to increase government superintension. J Clin Exp Invest 2013; 4 (4): 472-44

Effects of intraarticular ketamine combined with periarticular bupivacaine on postoperative pain after arthroscopic meniscectomy

Objectives: This study aims to evaluate the effects of two different doses of intraarticular ketamine on visual analog scale (VAS) scores at rest and movement, time to first analgesic requirement, and 24-h morphine consumption in patients undergoing arthroscopic meniscectomy as well as to assess the frequency of postoperative nausea&vomiting, respiratory depression, pruritus, urinary retention, and constipation and to compare the time to discharge. Patients and methods: This prospective randomized doubleblind study was performed between August 2013 and August 2014 on 75 patients (32 males, 43 females; mean age 46.7±13 years; range, 18 to 75 years) with American Society of Anesthesiologists scores of I-II scheduled for unilateral meniscectomy. Patients were randomized to receive 0.5 mg.kg-1 ketamine (group K1), 1 mg.kg-1 ketamine (group K2) or saline (group S) to a total volume of 20 mL intraarticularly at the end of the surgery. All patients were performed periarticular 10 mL 0.5% bupivacaine infiltration. Visual analog scale at rest and during passive knee movement was used to evaluate pain both preoperatively and at postoperative 0, 30 min, and 1, 2, 4, 6, 12, and 24 h. Time to first analgesic requirement and morphine consumption were recorded. Results: Visual analog scale scores at rest and during movement at postoperative 0 were significantly reduced in group K2 compared with group S (p<0.05). The first analgesic requirement time was significantly longer in group K1 (76.9±25.2 min) and group K2 (93.4±26.1 min) than group S (29.3±7.1 min). Morphine consumption was lower in group K2 compared to group K1 and group S at postoperative 30 min, and 1 and 2 h. However, 24-h morphine consumption was similar in all groups. Conclusion: Intraarticular injection of 0.5 mg.kg-1 and 1 mg.kg-1 ketamine for postoperative pain management provided similar analgesic efficacy. However, high dose ketamine more noticeably decreased opioid requirement in the early postoperative period. © 2020 Turkish Joint Diseases Foundation

Comparison of the effect of haemostatic neural tissues in spine surgery (Histological analysis in rat models)

Omurga cerrahisi uygulamalarında epidural kanama ve hematom gelişimi çok önemlidir. Omurga ameliyatlarının yapılabilmesi için kanama odaklarının kontrol altına alınması gereklidir. Hemostaz için kullanılan yöntemlerden kanama odağı üzerine basınç oluşturma ve kanama odağının bağlanması ya da koterize edilmesi omurga cerrahisinde çoğu zaman mümkün değildir. Bu sebeple kanamayı durdurmak için çeşitli kimyasal hemostatik ajanlar (absorbabl jelatin spanç, oksidize selluloz) kullanılmaktadır. Kimyasal hemostatik ajanların en muhtemel ve korkulan komplikasyonu, cerrahi sonrasında ortaya çıkabilecek nörolojik defisittir. Klinik uygulamalarda bazen bu sorunla karşılaşılabilmekle birlikte bu ajanların histolojik etkilerini ortaya koyan ayrıntılı çalışmalar yetersizdir. Bu çalışmamızda amaç hemostatik ajanların nörolojik dokular üzerindeki etkisinin histolojik ve klinik olarak karşılaştırılmasının yapılmasıdır. Çalışmada 18 adet canlı sıçan ameliyat edilerek lomber bölgelerine iki seviyeli laminektomi yapıldı. Laminektomi sonrasında sıçanlar 3 gruba ayrıldı. 1. grupta (kontrol grubu) laminektomi sonrası primer olarak kas, ciltaltı ve cilt kapatıldı. 2. grupta (spongostan grubu) laminektomi ardından duramater üzeri emilebilir jelatin spanç ile örtülürken 3. grupta (surgicel) duramater üzeri oksidize selluloz ile örtülerek kapatıldı. Tüm deneklerin ameliyat öncesinde ve sonrasında nörolojik değerlendirmesi yapıldı. 48 saat sonra denekler sakrifiye edilerek lomber omurgaları çevre dokular ile birlikte çıkarıldı ve kesitler alınarak ışık mikroskopisi ile duramater ve nöral dokular üzerindeki hemostatik ajanların etkileri araştırıldı. Deneklerin nörolojik skorlamaları ile histolojik bulguları çift kör olarak karşılaştırıldı. Sonuç olarakæ grupların histolojik sonuçlarını, erken dönem ve geç dönem nörolojik bulgularını karşılaştırdığımızda anlamlı bir sonuç elde edilemedi. Ancak oksidize selluloza bağlı gelişen inflamatuar yanıtın, diğer gruplara oranla daha fazla olduğu tespit edildi. Oksidize sellulozun asidik ortam oluşturarak hemostatik etki göstermesi, inflamatuar yanıtın daha yoğun bir şekilde görülmesine neden olabilir. Anahtar Sözcükler: oksidize selluloz, emilebilir jelatin spanç, rat modeli Epidural bleeding and hematoma is very important in spinal surgical procedures. The bleeding should be controlled to permit spinal operations. Some methods of hemostasis such as pressure to the bleeding area, ligation or electrocauterization generally are not feasible. For this reason, various chemical hemostatic agents (absorbabl gelatin sponge, oxydized cellulose) are used to stop bleeding. The most frightened and possible complication of chemical hemostatic agents is postsurgical neurolgic deficits. This problem sometimes can be seen during clinical practice, however, detailed histological studies with good evidence is seldom. The aim of our study is comparison of the effect of hemostatic agents on neural tissues both histologically and clinically. In this study, 18 winstar albino rats were operated and two level laminectomies were performed. The rats were divided into three groups. In group 1 (control group), muscle, subdermis and dermis were sutured in routine manner. In group 2 (gelatin sponge group), duramater was covered with gelatin sponge after laminectomy, while oxidized cellulose was used in group 3 (oxidized cellulose group). . Neurologic evaluations were made for all test subjects. 48 hours after operation, rats were sacrified and lumber spines were exicised with all surrounding tissues for evaluation of the effect of agents on neural tissues by light microscopy. Neurologic scores and histologic findings were compared with double-blind evaluation. As a resultæ there were no statistically singnificant differences of histologic findings, early and late neurologic evaluation between the groups. However, inflammatory reaction was more severe in oxidized cellulose group. Oxidized cellulose is increased the acidity of tissues for hemostatic effects, and thus may lead to clear inflammatory reaction. Keywordsæ Oxidized cellulose, absorbable gelatin sponge, rat model

Evaluation of associations between condylar morphology, ramus height, and mandibular plane angle in various vertical skeletal patterns: a digital radiographic study

Background To evaluate condylar morphology, ramus height, and asymmetry indexes in patients with different vertical skeletal patterns and to determine the association between condylar and ramal measurements with the mandibular plane angle. Methods Dental panoramic radiographs of 60 patients with different skeletal patterns were evaluated. According to the cranial base (Sella-Nasion)-mandibular plane (SN-MP) angle, the patients were divided into three groups: normal angle (NA), low angle (LA), and high angle (HA). The condylar area, condylar perimeter, condylar heights, and ramus height were measured, and the asymmetry index value of each measurement was calculated. A one-way analysis of variance as well as a post hoc Tukey and Kruskall-Wallis tests were used to determine intergroup differences. Pearson's correlation coefficient was used to determine the relationship between all measurements and SN-MP. Results The intergroup comparison of condylar area, condylar perimeter, condylar heights, and ramus height measurements showed that the patients in the LA group have statistically significantly greater values compared to those in the HA group. A statistically significant difference was detected between the NA and LA groups only in the condylar area measurements. There was no statistical difference only in the ramus height measurements between the NA and HA groups. Asymmetry index values of the groups were similar. The negative correlations were found between all measurements and the SN-MP angle. Conclusion HA individuals have lower ramus heights and smaller condylar morphologies than NA and LA individuals. In addition, as the SN-MP angle increases, the condyle dimensions and ramus height decrease, and this is a clinically important finding