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The Effects of Colchicine-Impregnated Oxidized Regenerated Cellulose on Capsular Contracture

Acuner B. | Baser N.T. | Aslan G. | Terzioglu A. | Caydere M. | Ustun H. | Görgü M.

Article | 2017 | Surgical Innovation24 ( 5 ) , pp.417 - 422

Capsular contracture is the most common complication of breast augmentation. Oxidized regenerated cellulose can be used as a matrix for drug transport. Colchicine is an antimitotic drug that interferes with various steps of wound healing. The aim of this study was to evaluate the effects of oxidized regenerated cellulose alone or in combination with colchicine on capsular contracture. Twenty-one adult female Wistar-Albino rats were divided into 3 groups. In group 1 silicone blocks only, in group 2 oxidized regenerated cellulose-wrapped silicone blocks, and in group 3 colchicine-impregnated oxidized regenerated cellulose-wrapped sili . . .cone blocks were inserted in the dorsal region. Four weeks later, implants were removed and histopathological examination was performed. Capsular thickness, inflammatory infiltrate degree, collagen fiber organization, and myofibroblast density were evaluated. Macroscopic examination revealed a distinct capsule formation only in group 1 animals, with average measurement being 134.65 µm on histopathological examination. In groups 2 and 3 animals, no distinct capsule formation was seen. Inflammatory infiltrate degree was found to be less in groups 2 and 3 animals than in group 1 animals. Collagen fiber organization around the implants was found to be parallel and organized in group 1 animals, whereas it was random and disorganized in animals in both groups 2 and 3. High myofibroblast density was observed in animals in groups 1 and 2, while no myofibroblast was found in animals in group 3. The results of our study suggest that coating silicone implants with oxidized regenerated cellulose or with colchicine-impregnated oxidized regenerated cellulose may be effective in preventing capsular contracture. © The Author(s) 2017 Daha fazlası Daha az

Remote sensing of aerosol optical depth using an airborne polarimeter over North China

Wang H. | Yang L. | Deng A. | Du W. | Liu P. | Sun X.

Article | 2017 | Remote Sensing9 ( 10 ) , pp.417 - 422

The airborne Atmosphere Multi-angle Polarization Radiometer (AMPR) was employed to perform airborne measurements over North China between 2012 and 2016. Seven flights and synchronous ground-based observations were acquired. These data were used to test the sensor's measurements and associated aerosol retrieval algorithm. According to the AMPR measurements, a successive surface-atmosphere decoupling based algorithm was developed to retrieve the aerosol optical depth (AOD). It works via an iteration method, and the lookup table was employed in the aerosol inversion. Throughout the results of the AMPR retrievals, the surface polarized . . .reflectances derived from air- and ground-based instruments were well matched; the measured and simulated reflectances at the aircraft level, which were simulated based on in situ sun photometer observed aerosol properties, were in good agreement; and the AOD measurements were validated against the automatic sun-photometer (CE318) at the nearest time and location. The AOD results were close; the average deviation was less than 0.03. The MODIS AODs were also employed to test the AMPR retrievals, and they showed the same trend. These results illustrate that (i) the successive surface-atmosphere decoupling method in the retrieved program completed its mission and (ii) the aerosol retrieval method has its rationality and potential ability in the regionally accurate remote sensing of aerosol. © 2017 by the authors Daha fazlası Daha az

International Financial Centers After the 2008-2009 Global Financial Crisis

Bayramoglu, Mehmet Fatih | Yilmaz, Sinan


Tensile strength degradation of ceramic fibres due to cyclic loading

Kaya F.

Article | 2007 | Journal of Materials Science42 ( 4 ) , pp.1096 - 1107

Interfacial strength of Ti ß 21S/SCS 6 composite was increased via ageing. Composite specimens with ao/W ratios of 0.24 and 0.07 were prefatigued in three point bending at ambient and at 500°C both in the air and vacuum. Bridging fibres were extracted from the pre-fatigued specimens and tested in tensile loading to monitor the strength degradation due repeated opening and closing of the fatigue crack. A tri-modal Weibull distribution was employed to express strength distribution of the SCS 6 fibres. Results have shown that cyclic loading of the composites lower the mean tensile strength of the fibres by 20%, compared to the unfatigu . . .ed composite. A marked effect of initial unbridged defect size was observed, when the tensile strength data were divided into two sub-population using the fatigue crack length values. Compared to unfatigued composite, tensile strength reductions of 41 and 22% were measured from the prefatigued composites with ao/W of 0.24 and 0.07, respectively. © Springer Science+Business Media, LLC 2007 Daha fazlası Daha az

Giant left atrial myxoma causing mitral valve obstruction and pulmonary hypertension

Buyukates M. | Aktunc E.

Article | 2008 | Canadian Journal of Surgery51 ( 4 ) , pp.1096 - 1107

[No abstract available]

Raters’ knowledge of students’ proficiency levels as a source of measurement error in oral assessments [Konuşma sınavlarında bir ölçme hatası kaynağı olarak notlandıranların öğrencilerin dil seviyelerini bilmesi]

Tanriverdı-Köksal F. | Ortaçtepe D.

Article | 2017 | Hacettepe Egitim Dergisi32 ( 3 ) , pp.581 - 599

There has been an ongoing debate on the reliability of oral exam scores due to the existence of human raters and the factors that might account for differences in their scorings. This quasi-experimental study investigated the possible effect(s) of the raters' prior knowledge of students' proficiency levels on rater scorings in oral interview assessments. The study was carried out in a pre- and post-test design with 15 EFL instructors who performed as raters in oral assessments at a Turkish state university. In both pre- and post-tests, the raters assigned scores to the same video-recorded oral interview performances of 12 students f . . .rom three different proficiency levels. While rating the performances, the raters also provided verbal reports about their thought processes. The raters were not informed about the students' proficiency levels in the pre-test, while this information was provided in the post-test. According to the findings, majority of the Total Scores ranked lower or higher in the post-test. The thematic analysis of the raters' video recorded verbal reports revealed that most of the raters referred to the proficiency levels of the students while assigning scores in the post-test. The findings of the study suggest that besides factors such as accent, nationality, and gender of the test-takers and the assessors, raters’ prior knowledge of students' proficiency levels could be a variable that needs to be controlled for more reliable test results. © 2017, Hacettepe University. All rights reserved Daha fazlası Daha az

Milling of magnesium powders without additives

Çakmak G. | Öztürk T.

Article | 2013 | Powder Technology237 , pp.484 - 488

Mechanical milling of ductile metals and alloys into fine powders is difficult to achieve due to particle agglomeration. Even though cryogenic milling and/or wet milling can lead to substantial reduction of particle size, the production of fine powders from ductile metals and alloys is a difficult process. The current study deals with the milling of Mg and examines alternative processing methods that would yield an efficient size reduction. Two methods were studied; milling with MgH2 addition, and milling the powders pre-deformed by equal channel angular pressing (ECAP). The study showed that both methods are successful in preventin . . .g particle agglomeration resulting in a significant reduction in particle size. Equal channel angular pressing has the advantage that could be applied to all metals and alloys whereas milling with hydride could only be applied to metals forming their own hydride. It is concluded that, of the two methods, milling with hydride addition is a more effective method of size reduction. © 2012 Elsevier B.V Daha fazlası Daha az

How Roman engineers selected their water supplies

Kucukali S.

Article | 2007 | Proceedings of the Institution of Civil Engineers: Water Management160 ( 4 ) , pp.249 - 253

An account of a historical Roman water supply system in Zonguldak, northwest Turkey on the Black Sea coast is presented. This ancient water supply system demonstrates Roman engineering expertise in water management and hydraulic engineering applications. Although there is a river located near the Roman city (Filyos) with an average annual discharge of 89 m3/s (1970-2005 data), Roman engineers preferred to provide water from a 15 km distant karstic spring. The region, unlike the Mediterranean region, has good rainfall (1100 mm), which indicates another water quality criterion for selecting the karst spring as a water source. The most . . . important factor in the Roman choice appears to be water temperature. This selection criterion closely agrees with suggestions on water quality issues made by the Roman architect Vitruvius Daha fazlası Daha az

Expression of histamine receptors (H1, H2, and H3) in the rabbit endolymphatic sac: an immunohistochemical study

Dagli M. | Goksu N. | Eryilmaz A. | Mocan Kuzey G. | Bayazit Y. | Gun B.D. | Gocer C.

Article | 2008 | American Journal of Otolaryngology - Head and Neck Medicine and Surgery29 ( 1 ) , pp.20 - 23

Objective: The endolymphatic sac (ES) is part of the membranous labyrinth of the inner ear. Its central role in immunologic activity within the inner ear has been confirmed by numerous studies. The aim of this study was to investigate the expression of histamine receptors (H1, H2, H3) in the rabbit ES. Methods: A total of 10 healthy male New Zealand white rabbits weighing 2 to 3 kg were used in the experiments. For immunohistochemical studies, immunostaining was performed according to the avidin-biotin-peroxidase complex technique. Results: Serial sections of the ES of rabbits revealed the presence of H1, H2, and H3 receptor immunor . . .eactivity. Immunoreactive cells for all H1, H2, and H3 were found in the epithelial and subepithelial layers of the duct and the proximal ES. In conclusion, this study showed the immunohistochemical localization of H1, H2, and H3 receptors in the ES of rabbits. These receptors may be important in the homeostasis of the inner ear. In addition, they may be target receptors in the medical treatment of inner ear disorders such as endolymphatic hydrops. © 2008 Daha fazlası Daha az

Modeling of Ni-like molybdenum X-ray laser by ray tracing algorithm

Kurnali S. | Güven M.H. | Demir A.

Conference Object | 2007 | AIP Conference Proceedings899 , pp.325 - 326

Ni-like Molybdenum plasma is modeled with atomic physics and hydrodynamic code EHYBRID. In the model the Molybdenum slab target is pumped with double pulse and 1054 nm Nd:Glass laser is used as the pumping laser. The most efficient plasma condition obtained with the configuration of a main pulse with 1.2 ps duration and 3.5×1014 Wcm-2 intensity pumped peak to peak 340 ps after a pre-pulse with the duration of 280 ps and intensity of 1.2×1012 Wcm-2 is concerned for the ray-tracing. The radial and transverse refraction of x-ray laser propagating along longitudinal axis of the plasma is calculated with the refraction equation numerical . . .ly by Runge-Kutta method. The amplification of 18.9 nm Ni-like Molybdenum x-ray laser along its path through the plasma is modeled and the near-field image of the intensity at the exit of the plasma is obtained. © 2007 American Institute of Physics Daha fazlası Daha az

Effects of different rotary files combined with different irrigation needles on apically extruded debris

Uzunoglu E. | Turker S.A. | Görduysus M.

Article | 2015 | Brazilian Dental Journal26 ( 4 ) , pp.347 - 350

The aim of this study was to compare the apically extruded debris associated with ProTaper Next and OneShape Apical files using two different irrigation needles, open-ended and closed-ended (Max-I-Probe). Forty-eight mandibular premolars were assigned to four groups (n=12) as follows: Group PTN-SN: Root canal was prepared with ProTaper Next (PTN) and irrigated with open-ended standard needle; Group PTN-MP: Root canal was prepared with PTN and irrigated with Max-I-Probe; Group OSA-SN: Root canal was prepared with OneShape Apical (OSA) and irrigated with open-ended needle; Group OSA-MP: Root canal was prepared with OSA and irrigated w . . .ith Max-I-Probe. Debris extruded during instrumentation was collected into pre-weighed Eppendorf tubes. After storage in an incubator at 70 °C for 5 days, the Eppendorf tubes were weighed to obtain the final weight with extruded debris. The difference between pre-and post-debris weights was calculated and statistical analysis was performed using Kruskal-Wallis and Mann-Whitney U tests (p0.05). OneShape Apical and ProTaper Next resulted in extrusion of debris beyond the apical foramen, regardless of needle tip. © 2015, Associacao Brasileira de Divulgacao Cientifica. All rights reserved Daha fazlası Daha az

Design of a universal thermoelectric module test system for testing rat brain thermoelectric hypothermia

Demirel H. | Ciylan B. | Erkal B. | Yilmaz S.

Article | 2007 | IET Science, Measurement and Technology1 ( 3 ) , pp.160 - 165

A universal microcontroller test system, which aims to determine the parameters of thermoelectric modules under various thermal loads, has been designed and realised using a novel test method. The test system has been designed according to a more simplified form of the present formula set, which has been made to accept minimum variables as the input in order to obtain more precise results. It measures all the parameters of a working thermoelectric module by measuring only the hot-side temperature, module operation voltage, current and thermal voltage values of the module. The new test system has been used to measure a standard therm . . .oelectric module (Melcor CP 1.4-127-10L) in order to verify its performance. It has also been used to test the operation of an experimental medical apparatus, which is used to induce hypothermia (low body temperature) in the brains of rats using a thermoelectric module. © The Institution of Engineering and Technology 2007 Daha fazlası Daha az

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