Microstructural and optical properties of La-doped ZnO thin films deposited by spin coating on quartz glass

In this work, we have produced pure and composite zinc oxide-lanthanum oxide thin films. In the process we have started with a pure ZnO thin films and ended up with several lanthanum oxide phases containing thin films (La2O3, La(OH)3 and LaOOH) by introducing La in various levels of concentrations, ranging from 0% to 100%. We have managed to attain crystal phases in all doping concentrations. All the produced thin films have been crystallized at the annealing temperatures of 1000 °C for duration of 6 h. The X-ray diffraction (XRD) patterns have been taken to see the formation of crystal phases of all pure and composite ZnO-lanthanum oxide thin films. XRD results gave insight that the various crystal phases related to ZnO and lanthanum oxide laid together within the thin film matrices, which have been produced in different doping concentrations. The scanning electron microscopy (SEM) micrographs and UV-Vis absorption studies have also been performed to elucidate the composed film structures, together with some optical parameters evaluation such as refractive index and dielectric constant

The effect of using animations on pre-service science teachers’ science achievement

AbstractIn this study, the effect of animation technique on the learning of properties of electromagnetic waves (EMWs) for pre-service science teachers has been investigated. The research has been carried out for two weeks on 2nd grade pre-service science teachers. This study has been carried out with experimental and control groups consisted of 70 students in total. 35 students were randomly assigned to experimental group and control group respectively. The achievement test was given to both groups before and after the treatment. Significant difference has been found between the experimental group and control group (p<0,05)

Antioxidant activity of the fruits of Pyracantha coccinea using ethanolic extract method

Pyracantha coccinea Roem. (scarlet firethorn) is known as a medicinal plant that can be up to 3 m in height with lots of thorns, grown generally in South and Southeast Europe and Turkey. Pyracantha coccinea Roem is being used in folk medicine since its fruits have diuretic, cardiac and tonic properties. To determine the antioxidant level of the different parts of the plants takes interest in the current researches. In this study it has been aimed to evaluate the antioxidant and antimicrobial activity levels, Fe3+ reduction power and the total phenolic amount of the ethanolic extracts of the fruits of Pryacantha coccinea using DPPH scavenging, the disc diffusion, reduction power and Folin-Ciocalteu methods, respectively. IC50 value, which represents the 50% scavenging value of DPPH radical of prepared fruit extracts using the Maceration technique, is evaluated to be 36.53 µg/mL The total phenolic content is determined to be 199.6 mgGA/100g and Fe+3 ions are reduced to a certain amount for various concentration levels (from 20 to 100 µg/mL). From the current research we have also found that the fruits of Pyracantha coccinea have no any antimicrobial activity. As a general result of the current study it has been concluded that the fruits of Pyracantha coccinea have extremely higher level of antioxidant activity depending upon the phenolic contents, showing that they can be used in various food and health applications

Ultrazvučna procjena debljine bedrene hrskavice u bolesnica sa sindromom policističnih jajnika

The aim of the study was to investigate knee cartilage thickness in polycystic ovary syndrome (PCOS) patients using ultrasonography and to assess the effects of sex steroids on osteoarthritis development. A total of 90 female patients were enrolled in the study, including 47 patients diagnosed with PCOS as study group and 43 patients admitted to our hospital for any other complaints as control group. Ultrasonographic evaluation of both knees was performed in all patients. The knee cartilage thickness was measured at lateral condyle, intercondylar area and medial condyle. The measurements were averaged for each region. The mean femoral cartilage thickness was greater in the study group compared with control group in all regions, with a statistically significant difference (p<0.005). In conclusion, we found PCOS patients to have greater mean cartilage thickness, supporting the possible effects of sex steroids on osteoarthritis development.Cilj istraživanja bio je ultrazvučno procijeniti debljinu hrskavice koljena u bolesnica sa sindromom policističnih jajnika (SPCJ) i učinak spolnih hormona na razvoj osteoartritisa. U istraživanje je bilo uključeno ukupno 90 žena, tj. 47 bolesnica s dijagnozom SPCJ kao ispitna skupina i 43 bolesnice primljene na odjel zbog drugih tegoba kao kontrolna skupina. Ultrazvučna procjena obaju koljena učinjena je u svih bolesnica. Debljina hrskavice koljena mjerena je u lateralnom kondilu, interkondilarnom području i medijalnom kondilu te je izračunat prosjek mjerenja za svaku regiju. Srednja debljina koljenske hrskavice bila je veća u ispitnoj skupini u usporedbi s kontrolnom skupinom u svim regijama, a razlika je bila statistički značajna (p<0,005). Dakle, utvrđeno je da bolesnice sa SPCJ imaju veću srednju debljinu koljenske hrskavice, što govori u prilog mogućeg utjecaja spolnih hormona na razvoj osteoartritisa

The phase behavior and synthesis of mesostructured coupled semiconductor thin films : MESO-CdS-TiO2

Ankara : The Department of Chemistry and the Institute of Engineering and Sciences of Bilkent University, 2009.Thesis (Master's) -- Bilkent University, 2009.Includes bibliographical references leaves 86-100.Mesostructured [Cd(H2O)4](NO3)2 - titania - P123 ((PEO)20(PPO)70(PEO)20, PEO = -OCH2CH2-, PPO = -OCH(CH3)CH2-) materials have been investigated by changing the [Cd(H2O)4](NO3)2 and titania content of the structures. This has been achieved by making thick samples by casting and thin film samples by spin coating of a butanol solution of [Cd(H2O)4](NO3)2, P123, nitric acid and Ti(OC4H9)4. The film samples are named as meso-xCd(II)-yTiO2, where x is the Cd(II)/P123 and y is TiO2/P123 mole ratios. Increasing the titania amount in the media has transformed the samples from LC-like to soft and then to rigid mesostructured materials. Changing the amount of [Cd(H2O)4](NO3)2 salt in the media only influenced the mesostructure, such that no change on the mechanical properties is observed. However, the synthesis of rigid mesostructured titania materials required controlled humidity. The rigid film samples were prepared first by spin coating and then by aging under a 50% humidity oven. The mesostructure remains stable upon H2S reaction, in the soft and rigid materials region. However, only rigid samples stand to removal of nitrates from the media that is important to keep the CdS nanoparticles stable in or on the pore walls of mesostructured film samples. The phase behavior of the meso-Cd(II)-TiO2, the structural properties of the meso-xCdS-yTiO2 samples, coordination and elimination of the NO3 - ions and the particle size of the CdS nanocrystallites were investigated using diffraction (XRD), spectroscopy (FT-IR, Raman and UV-Vis absorption, EDS) and microscopy (POM, SEM, and TEM) techniques.Okur, Halil İbrahimM.S

A tumoral mass (local recurrence of renal cell carcinoma) causing massive intraabdominal bleeding after blunt abdominal trauma

AbstractBackgroundSolid organ injury after abdominal trauma is a common condition, however, injury of the local recurrent tumoral masses following abdominal trauma is rare. The injuries and bleeding in recurrent tumors tend to be highly serious since they are more fragile. The bleedings caused by renal cell carcinomas and by the traumatic laceration of their recurrence commonly occur in the retroperitoneum.In this report, we present a 55-year-old female patient who underwent emergency surgery due to intraabdominal bleeding and bleeding was from the recurrence of a renal cell carcinomas.Presentation of caseThe 55-year-old female patient was admitted to the emergency service with intraabdominal bleeding. Physical examination revealed tenderness in the right lower quadrant, particularly in the traumatic area. Ultrasonography and computed tomography revealed diffuse intraabdominal fluid and a ruptured bleeding mass was excised. Pathological analysis indicated that the mass was isolated local recurrence of renal cell carcinoma.DiscussionSolid organ injury caused by blunt abdominal trauma may be accompanied by tumoral laceration; however, minor bleeding may occur in cases with blunt trauma, coexistence of blunt abdominal trauma with local recurrence and massive bleeding is extremely rare.Control of bleeding is more challenging in tumoral tissues compared to normal tissues. The bleeding intraabdominal area rather than the retroperitoneal area, and this condition was attributed to the peritoneal tear caused by the trauma.ConclusionLocal recurrent tumoral masses may be the source of the intraabdominal massive bleeding after blunt trauma

THE EFFECT OF COMPUTER-ASSISTED INSTRUCTION ON THE LEARNING OF BLACK BODY, COMPTON AND X-RAYS

The main purpose of this study is to compare the effect of computer assisted instruction on the learning of black body, Compton, x-rays topics by pre-service science teachers with the method of traditional teaching. This research was conducted by the participation of 70 students from two different classes of 2 nd grade at the İnönü University Education Faculty during the spring semester of 2008-2009 academic years. The study has been done as an experimental study according to pretest and posttest model. Independent sample t test was used for data analysis. While the instruction of black body, Compton, x-rays subjects in experimental group was performed for two weeks by means of animations which were prepared with Macromedia Flash 8.0 Program, the instruction of same subjects in control group was performed by using a traditional instruction method. The result of the study shows that students taught by computer supported animations were performed better scores than those in traditional teaching group (p&lt;0,05)

Low-field behavior of Ti-added MgB2/Cu superconducting wires

We report on low-field magnetic properties of Ti-added (0-20 wt.% of Ti) Cu-clad MgB2 superconducting wires. Wires were produced by mixing appropriate amount of Ti and reacted MgB2 powder which was then placed inside Cu tubes with a diameter of 6 mm. The tubes were then cold worked by rolling or drawing to smaller diameters and then annealed at various temperatures to enhance the grain connectivity. XRD studies show that Ti addition results in new but minor phases. We have then measured ac susceptibilities in the temperature range between 20 K and 40 K in ac fields of 20-1600 A/m. The data show that an additional loss mechanism is established with Ti-addition. The calculated ac losses are increasing with increasing Ti-content in the main superconducting matrix

Erişkinde iki taraflı primer reflüksif ve obstrüktif olmayan megaüreter: Çok nadir bir olgu

Reflüksif ve obstrüktif olmayan megaürter genellikle yeni doğanlarda teşhis edilir. Yetişkinlerde çok nadirdir. Bu olgu sunumunda makroskopik hematüri ile başvuran 45 yaşındaki bir erkek hasta sunuldu. Klinik değerlendirmelerden sonra primer reflüksif ve obstrüktif olmayan megaüreter teşhisi kondu. Buna ek olarak, bu çok ender vaka eşliğinde mevcut literatürü gözden geçirdik.Non-refluxing and non-obstructive megaureter is usually diagnosed in neonates. It is very rare in adults. Herein we presented a 45 year-old man with macroscopic hematuria. He was diagnosed primary non-refluxing non-obstructive megaureter after clinical evaluations. In addition we reviewed current literature in the light of this very rare condition

Protective effects of cordycepin on the histopathological changes and oxidative stress induced by hepatic ischemia/reperfusion in rats

Aim: To investigate the effects of cordycepin on the histopathological changes and oxidative stress induced by hepatic ischemia/reperfusion (I/R) in rats. Method: Forty male Wistar rats were randomly divided into 4 groups as group I (sham, n=10), group II (control, n=10), group III (I/R-untreated, n=10) and group IV (I/R-cordycepin, n=10). Liver ischemia was induced for 30 min then reperfusion was allowed for 1 h. At the end of the experiment, liver specimens and blood samples were taken for histopathological and antioxidant evaluations, and biochemical analysis. Results: The levels of IL6, IL-1β, and TNFα in the serum and liver tissues were higher in the I/R-untreated group compared to the I/R-cordycepin treated group. In the I/R-cordycepin group, serum MDA levels were decreased compared with the I/R-untreated group. The I/R-cordycepin treated group showed an increase in TAS levels, and a decrease in TOS levels compared with I/R-untreated group. The histopathological injury score were significantly lower in the I/R-cordycepin treated group compared to the I/R-untreated group.&nbsp; In the I/R-untreated group, the integrity of the hepatocyte cell lines deteriorated. Mononuclear inflammatory cells infiltrated the parenchyma regions, the sinuses dilated and there was diffuse congestion Preoperative treatment with cordycepine reduced histopathological abnormalities. Conclusion: Cordycepin has demonstrated significant hepatoprotective effects against I/R injury induced in rats through TAS elevation and reduction of TOS, MDA and proinflammatory cytokines