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Search Results: 1 - 10 of 409 matches for " Meral OGUZ "
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Alzheimer's Disease Patients Generate Late and Reduced Cortical Activity For Movement Preparation
Gorsev YENER,Muslum YILMAZ,Meral OGUZ,Pinar KURT
Journal of Neurological Sciences , 2010,
Abstract: Background: Alzheimer's disease (AD) is a common neurodegenerative disease that affects cognitive functions in the absence of motor signs. However, motor associated functional cortical changes mirror the changes of cognitive network in AD patients. The movement related cortical potentials (MRCP) can be used to investigate the cognitive processes prior to voluntary movement. The neuropsychological deficits that implicate disruption of involving frontal motor network in early AD would also cause alterations in all phases of MRCP. The present study aimed to investigate whether such changes occur in MRCPs of AD patients.Methods: MRCP of twenty-three mild probable AD and twenty healthy, education-, gender- and age-matched control subjects were studied.Results: AD patients differed from healthy control subjects on mini mental state examination (MMSE), both verbal and visual memory, verbal fluency, executive function and visuo-spatial test scores. AD patients showed significant changes in both early and late phases of Bereitshaftspotential (BP) than controls. Diminished amplitude and less preparation time for movement in MRCP recordings along with executive dysfunction were found.Conclusion: These findings seem to reflect the disruption of frontal motor network during movement preparation in AD and may correspond to a loss of motor preplanning caused by deranged neuronal input into supplementary motor area (SMA).
Comparison of Turkish version of mini mental state examination and short orientation-memory-concentration test of cognitive impairment in Alzheimer disease
Meral K. OGUZ,Gorsev YENER,Bar?s BAKLAN,Fatma UZUNEL
Journal of Neurological Sciences , 2003,
Abstract: In this study, we tested congruent validity of Turkish version of Mini Mental State Examination (MMSE) to the KKM (K sa Kognitif Muayene : Short Cognitive Examination) test, the only test that was proved to be valid and reliable in Turkish population. For this purpose, we administered KKM, MMSE, and Reisberg’s Golbal Deterioration Scale on 71 probable Alzheimer’s patients. We found significant correlation between MMSE and KKM across all stages of dementia and all groups of education levels. We concluded that MMSE can be administired to Alzheimer patients as safely as KKM test.
Assessment of cardiac remodeling in asymptomatic mitral regurgitation for surgery timing: a comparative study of echocardiography and magnetic resonance imaging
Oner Ozdogan, Alper Yuksel, Cemil Gurgun, Meral Kayikcioglu, Oguz Yavuzgil, Cahide S Cinar
Cardiovascular Ultrasound , 2010, DOI: 10.1186/1476-7120-8-32
Abstract: Twenty-one patients with moderate to severe asymptomatic MR were evaluated by echocardiography and MRI. LA and LV ejection fractions (EFs) were calculated by echocardiography and MRI. Pulmonary veins (PVs) were measured from vein orifices in diastole and systole from the tangential of an imaginary circle that completed LA wall. Right upper PV indices were calculated with the formula; (Right upper PV diastolic diameter- Right upper PV systolic diameter)/Right upper PV diastolic diameter.In 9 patients there were mismatches between echocardiography and MRI measurements of LV EF. LV EFs were calculated ≥60% by echocardiography, meanwhile < 60% by MRI in these 9 patients. Severity of MR evaluated by effective regurgitant orifice area (EROA) didn't differ with preserved and depressed EFs by MRI (p > 0.05). However, both right upper PV indices (0.16 ± 0.06 vs. 0.24 ± 0.08, p: 0.024) and LA EFs (0.19 ± 0.09 vs. 0.33 ± 0.14, p: 0.025) were significantly decreased in patients with depressed EFs when compared to patients with normal EFs.MRI might be preferred when small changes in functional parameters like LV EF, LA EF, and PV index are of clinical importance to disease management like asymptomatic MR patients that we follow up for appropriate surgery timing.In chronic mitral regurgitation (MR), symptoms do not develop until decompensation of the left ventricle (LV). Patients with MR, who are asymptomatic with normal ventricular performance, will need valve surgery at an annual rate of 10.3% [1] and early surgery is recommended for asymptomatic severe MR because of increased postoperative LV dysfunction [2] in patients with delayed surgery. However, recent reports have emphasized another process called "watchful waiting" [3] for relatively low-risk patients.Mortality after delayed valve surgery is significantly increased with severe MR (Effective Regurgitant Orifice Area (EROA) ≥0.4 cm2) [4] and depressed LV ejection fraction (EF < 60%). Therefore, timing of the valve surgery
Etiology and portal vein thrombosis in Budd-Chiari syndrome
Oguz Uskudar, Meral Akdogan, Nurgul Sasmaz, Sevinc Yilmaz, Muharrem Tola, Burhan Sahin
World Journal of Gastroenterology , 2008,
Abstract: AIM: To research the etiology, portal vein thrombosis and other features of Budd-Chiari syndrome (BCS) patients prospectively.METHODS: A total of 75 patients (40 female, 35 male) who were diagnosed between January 2002 and July 2004 as having BCS were studied prospectively. Findings from on physical examination, ultrasonography, duplex ultrasonography and venography were analyzed. Hemogram and blood chemistry were studied at the time of diagnosis and on each hospital visit. Bone marrow examination and immune phenotyping were performed by a hematologist when necessary. Protein C, S, antithrombin III, activated protein C resistance, and anticardiolipin antibodies, antinuclear antibodies, and anti ds-DNA were studied twice. The presence of ascite, esophageal varices, and portal thrombosis were evaluated at admission and on every visit.RESULTS: At least one etiological factor was determined in 54 (72%) of the patients. The etiology could not be defined in 21 (28%) patients. One etiological factor was found in 39, 2 factors in 14 and 3 factors in 1 patient. The most common cause was the web (16%), the second was Hydatid disease (11%), the third was Behcet’s disease (9%). Portal vein thrombosis was present in 11 patients and at least one etiology was identified in 9 of them (82%).CONCLUSION: Behcet’s disease and hydatid disease are more prominent etiological factors in Turkey than in other countries. Patients with web have an excellent response to treatment without signs of portal vein thrombosis while patients having thrombophilic factors more than one are prone to develop portal vein thrombosis with worse clinical outcome.
Structural and Electrical Properties of Niobium Doped Y0.6Gd0.4Ba2-xNbxCu3O7-y Superconductors  [PDF]
Mucahit Yilmaz, Oguz Dogan
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.28147
Abstract: Polycrystalline samples of Y0.6Gd0.4Ba2-xNbxCu3O7-y(YGBNCO) with different Nb contents (x = 0.05, 0.10, 0.15, 0.20, and 0.25) were prepared using the usual solid state reaction technique. The structure for all samples was characterized by XRD and SEM. The electrical properties were measured by the FPP method in the temperature range from 70 to 130 K. The lattice constant of b remains almost unchanged and a and c increases with the increase of Nb content with x ≤ 0.10. The zero resistance transition temperature and Jc decrease with increasing Nb content. But superconductivity did not suppress. As the Nb content in the samples increases, it gives a diffused phase indicating a niobium perovskite phase and it is a small amount of unidentified phase.
Red Blood Cell Mechanical Stability  [PDF]
Oguz K. Baskurt
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.410B003
Abstract: It has been well documented that shear forces effective above a certain magnitude under flow conditions causes damage in blood cells. This damage ranges from slight morphological alteration to the destruction of red blood cells (RBC). The hemolytic trauma to RBC can easily be detected by measuring free hemoglobin level in plasma, however there are no standardized protocols to quantitate subhemolytic trauma. Ektacytometry has been used to study the alterations in RBC mechanical properties induced by the application of shear stress at various levels. Additionally, a protocol for measuring the hemolytic threshold as an indicator of subhemolytic damage to RBC has been developed based on ektacytometry. These standardized protocols may find applications in the pre-clinical and clinical evaluation of artificial organs and biomedical devices contacting with blood.
Effect of immediate implant placement and loading on soft tissue management  [PDF]
Erdem ?zdemir, Yener Oguz
Open Journal of Stomatology (OJST) , 2013, DOI: 10.4236/ojst.2013.37066
Abstract:

The recent article describes immediate implant placement and loading in the anterior segment. The main aim of this treatment option was to deliver provisional prosthesis to the patient in the same day of surgery, form papilla contours, and eliminate waiting of osseointegration time and the second surgery.

Combating Insurance Abuses: A Comparative Analysis between Turkey and United Kingdom  [PDF]
Oguz Polat, Zeynep Reva
Beijing Law Review (BLR) , 2018, DOI: 10.4236/blr.2018.92013
Abstract: Insurance fraud may be defined as intentional deceit of an insurance company by a beneficiary with goal of earning financial gains before or after issuing of the policy. It may occur in many types. One of the insurance fraud types is self-cutting of the insured for insurance claim. However it sounds unbelievable, it is a fact which is getting more prevalent day by day. In this study it is aimed to provide an overview of the type, scale and impact of insurance fraud in Turkey, and particularly self-cutting for the insurance claim over a case study. Insurance fraud has an impact not only on insurers but also on the insureds. Therefore reducing and deterring the insurance fraud is significant, and it is also aimed to offer the actions to reduce insurance fraud in this study. Insurance fraud has an impact not only on insurance companies but also on the insured. Therefore reducing and deterring the insurance is significant. In this study it is aimed to provide an overview of the type, scale and impact of insurance abuses in Turkey and the UK. It is also aimed to specify the measures and the institutions on fighting against insurance abuse in Turkey and in the UK as well.
The Effect of an Instruction Designed by Cognitive Load Theory Principles on 7th Grade Students’ Achievement in Algebra Topics and Cognitive Load  [PDF]
Aygil Takir, Meral Aksu
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.32037
Abstract: The purpose of this study was to investigate the effect of an instruction designed by the Cognitive Load Theory (CLT) principles on 7th grade students’ achievement in Algebra topics and cognitive load. A quasi-experimental study was conducted in totally six weeks with 80 students. The instruction designed by CLT principles was used in the experimental group, while the instruction recommended by the Ministry of Education (MONE) was used in the control group. Researchers developed Teachers’ Guidelines and Students’ Booklets for using in the experimental group. At the end of each unit, the Subjective Rating Scale (SRS) was used to measure students’ cognitive load. At the end of the treatment, the Algebra Achievement Test (AAT) was administrated to both of the groups. Both descriptive and inferential statistical techniques were used for analyzing data. Results showed that instruction designed by CLT principles was effective for the Algebra teaching with the limitations of the study.
On Energy Dependence, Current Account Deficit and Population in Turkey  [PDF]
Cem Berk, Kazim Oguz Cin
Open Journal of Business and Management (OJBM) , 2018, DOI: 10.4236/ojbm.2018.61012
Abstract:
Energy industry is one of the most important elements in the development of countries. Energy dependence occurs when the energy produced in a country by using its own resources is unable to meet the consumption where the lacking amount needs to be imported. This might lead to significant effects in the current account of an economy. However in addition to non-renewable energy sources (such as natural gas, and oil), alternative production is available in Turkey (such as wind, solar, geothermal, biomass, and hydrogen) as well as projects to install nuclear plants. The population in Turkey on the other hand is unlikely to decrease even in the long term. In the Turkish economy, energy industry might affect the economic growth, trade deficit and population growth. This is proven by various studies explained in the summary of literature section of this paper. In this paper, energy consumption, population and trade deficit are analyzed in a data sample from a period of 1970 until 2014. The data is obtained from World Bank and Central Bank of Turkey. The relationship between energy consumption, population and current account deficit is analyzed by using Granger causality analysis, Augmented Dickey Fuller (ADF) Unit Roots Test”, Vector Autoregression (VAR) and Vector Error Correction Models (VECM). As a result of the “Granger Causaility Analysis”, it is determined that there is a two way relationship between energy consumption and trade deficit and one way relationship between population and trade deficit and between population and energy consumption. Therefore energy production strategies including the use of existing reserves and alternative energy sources are suggested for sustainable economic growth.
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