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Search Results: 1 - 10 of 1857 matches for " Erdal Aktürk "
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Evaluation of the relationship between serum high sensitive C-reactive protein and the elasticity properties of the aorta in patients with coronary artery ectasia
?sa Sincer,Erdal Aktürk,Nusret A??kg?z,Necip Ermi?
Anadolu Kardiyoloji Dergisi , 2011,
Abstract: Objective: Previous studies have shown an association between high sensitive C-reactive protein (hsCRP) and arterial stiffness in most cardiovascular diseases. High sensitive C-reactive protein and arterial stiffness have been considered as independent predictors of cardiovascular mortality in cardiovascular disease. The aim of this study was to investigate the relationship between hsCRP, a marker of systemic inflammation and aortic stiffness in patients with coronary artery ectasia (CAE). Methods: Our study was designed as cross-sectional study. Serum hsCRP levels and aortic stiffness parameters were measured in CAE patients (n=28) and age - and gender-matched control subjects (n=25). Serum hsCRP levels were determined by an immunonephelometry assay. Aortic strain (AS) and aortic distensibility (AD) were calculated from the aortic diameters measured using M-mode echocardiography and blood pressure obtained by sphygmomanometry. Independent samples “t” test, Chi-square test and Spearman correlation test were used for statistical analysis. Results: Serum levels of hsCRP in CAE group were higher than in the controls (p<0.001). AS and AD were significantly decreased in CAE patients compared to the controls (p<0.001 and p<0.001, respectively). There were negative correlations between hsCRP and AS (r=-0.862; p<0.001), and AD (r=0.852; p<0.001) and a positive correlation between hsCRP, and ASI (r=0.852; p<0.001).Conclusion: We have demonstrated that there is a significant correlation between serum hsCRP levels and aortic stiffness in patients with CAE. These findings may indicate an important role of hsCRP in the pathogenesis of impaired aortic stiffness in coronary ectasia.
Relationship between acute atrial fibrillation attack and intensive cigarette smoking
Erdal Aktürk,?sa Sincer,Aytekin Güven,?rfan Barut?u
Anadolu Kardiyoloji Dergisi , 2012,
Association of Mitral Annulus Calcification with High-Sensitivity C-Reactive Protein, Which Is a Marker of Inflammation
Ertu rul Kurto lu,Hasan Korkmaz,Erdal Aktürk,Mücahid Y lmaz,Yakup Alta ,Ahmet U kan
Mediators of Inflammation , 2012, DOI: 10.1155/2012/606207
Abstract: Objectives. There are limited clinical data revealing the relationship between mitral annular calcification (MAC) and systemic inflammation. The goal of the present study was to compare high-sensitivity C-reactive protein (hs-CRP) levels in patients with and without MAC and investigate the relationship between MAC and hs-CRP. Methods. One hundred patients with MAC who underwent transthoracic echocardiography (TTE) and 100 age-matched controls without MAC who underwent TTE were included in our study. Hs-CRP levels were compared between groups. Results. Prevalence of female gender, hypertension, and coronary artery disease were significantly higher in the MAC group than in the control group (64% versus 45%, =0.007, 42% versus 28%, =0.03 and 37% versus 18%, =0.003, resp.). On multivariate analysis, age, gender, and coronary artery disease were the only independent predictors of MAC. The levels of hs-CRP were higher in the MAC group than in the control group (2.02±0.35 versus 1.43±0.47 mg/dl, <0.001). This increase in hs-CRP levels in the MAC group persisted in patients without hypertension, coronary artery disease, and in male patients when compared to the control group. Conclusions. Our study demonstrated that hs-CRP, which is a sensitive marker of systemic inflammation, increased in patients with MAC.
Biomass Energy and Miscanthus x gigantheus in Terms of Human Health
Aktürk A.
Konuralp Tip Dergisi , 2010,
Abstract: Rising energy needs and the serious problems encountered with fossil energy resources directs the policy makers towards alternative energy sources. In this review, we present the popular biomass energy alternative and Miscanthus x gigantheus, with special emphasis to possible health related risks. Biomass energy has a priority among renewable energy alternatives. Miscanthus x gigantheus is a preferred plant due to its 90% less unwanted effects such as greenhouse and gas emissions and its relatively high photosynthesis capacity. Although less when compared to fossil energy sources, the biomass energy also has some possible health hazards such as greenhouse effect, threat to water resources and biodiversity, eutrophication, air pollution, decrease in agricultural land and food production as well as production accidents. Possible risks and preventive measures have to be quantitatively defined for establishments intending to produce biomass energy. Although biomass energy seems to be a better alternative when compared to fossil counterpart, continuous efforts should be sought for healthier alternatives such as energy derived from wind, water or the sun.
Nutritive Values and Health Aspects of the Date Fruit (Phoenix dactylifera)
Aktürk Z et al.
Konuralp Tip Dergisi , 2012,
Abstract: The date fruit (Phoenix dactylifera) is known since the ancient times and used in the construction of buildings, as a nutrient and also as a traditional remedy. Besides its economic value, the nutritive values and health aspects of this fruit should be known by health professionals A literature search was done in order to investigate the nutritive values and its implications to human health. Published literature in PubMed and also printed books were reviewed for this purpose. Especially raw date fruit is superior to many other fruits by its nutritive value. Its value in medicine is not just because of its relatively low glycemic index and high fiber content, there are clinical trials demonstrating its antioxidant features and usefulness to decrease postpartum bleeding. There are also reports of injuries caused by the date horn. It is concluded that the date fruit is a valuable and healthy nutrient. Its benefits as a traditional folkloric remedy need to be proven by appropriate studies.
Reliability and validity in medical research
Zekeriya Aktürk,Hamit Acemo?lu
Dicle Medical Journal , 2012,
Abstract: Scientists commonly refer to study instruments duringmedical research. In fact, the reliability and validity issuesgo beyond psychometric studies and can be linked withany kind measurements. In this study we aimed to explainthe reliability and validity concepts by giving examples.It is possible to evaluate the reliability and validity of aninstrument by scientific methods. If we speak of reliability,we have to mention stability (having the same results inrepeated measurements from the same sample), equivalence,and homogeneity. Homogeneity is related withinternal consistency; it measures how close results areobtained from items intending to measure the same structure.In other words, how consistent are the different itemsin measuring the same feature? Accordingly, the followingtypes of reliability can be measured: parallel forms, test/retest, inter-observer reliability, split half, and Cronbachalfa. From the point of validity, we will discuss contentvalidity, predictive validity, construct validity, concurrentvalidity, and face validity. Science means measurement.Wrong measurements will make our evidence and thusthe treatments unreliable. Therefore, medical researchershave to give utmost importance in receiving valid and reliableresults from the instruments they use.
Cytotoxic T lymphocyte antigen-4 (CTLA-4) A49G polymorphism and autoimmune blood diseases
Faruk Aktürk,Veysel Sabri Han?er,Reyhan Kü?ükkaya
Turkish Journal of Hematology , 2010,
Abstract: Objective: The cytotoxic T lymphocyte associated antigen-4 (CTLA-4) is expressed on T lymphocytes, and inhibits the T-cell responses. In animal models, it has been shown that complete CTLA-4 deficiency was lethal due to massive infiltration of tissues by polyclonally proliferating lymphocytes. CTLA-4 A49G polymorphism, which has been suggested to reduce the inhibitory function of the CTLA-4 molecule, was found to be associated with various autoimmune diseases in recent studies. Material and Methods: In this study, we evaluated the frequency of CTLA-4 A49G polymorphism in 46 patients with autoimmune hemolytic anemia (AIHA), 62 patients with immune thrombocytopenic purpura (ITP), and 150 healthy individuals. Results: Allele frequencies and genotype distributions were similar in both ITP and AIHA patients compared to healthy individuals. In subgroup analysis, however, we found that in chronic lymphocytic leukemia (CLL) patients with AIHA (n=4), all patients had CTLA-4 A49G polymorphism (3 had AG, 1 had GG). There was no significant statistical association between G allele and systemic lupus erythematosus (SLE) or AIHA.Conclusion: These data suggest that CTLA-4 A49G polymorphism does not contribute to the pathogenesis of lymphoproliferative diseases itself, nor does it increase the risk of autoimmune complications in patients with lymphoproliferative disease.
Yat r m Promosyon Ajanslar n n Do rudan Yabanc Yat r mlar ekme Ba ar lar n n ekim Modeli ile ncelenmesi(An Investigation of the Succes of Investment Promotion Agencies For Attracting Foreign Direct Investment Using Gravity Model)
Levent Necmi AKTüRK,?evket TüYLüO?LU
Y?netim ve Ekonomi , 2012,
Abstract: The competition about receiving foreign direct investment (FDI) towards countries has increased with the concentration of the globalization. This is the most important reasons for the increase in FDI competition, they provide one of the positive contributions that host countries. Nowadays, investment promotion agency (IPA) has been established to catch more FDI in many countries. These agencies give institutional help to foreign investors and all kinds of problems faced by the country on hand to advise. The aim of this study is to estimate the effects of IPA’s on FDI’s by employing unbalanced panel gravity model and than study the diversity of the existing literature reveals that this feature. These results will be used to assess the success of IPA’s toward their main goals.
?smail ?AH?N,Ahmet ERDO?AN,A. O?uz AKTüRK
Selcuk Universitesi Sosyal Bilimler Enstitusu Dergisi , 2007,
Abstract: In this study, the factors related to the school internship satisfaction of 286 undergraduatesenior students in the College of Education at Selcuk University were examined. As a datacollection instrument, a questionnaire developed by Aksu and Demirta (2006) was used. Twoscales measuring the school internship satisfaction of the pre-service teachers and the technologyuse in their internship school were added to the original survey. To report the participantdemographics, their affiliated program, gender, instructional technique, and computer andInternet ownership were asked. It was found that the school internship environment, principal,teacher, faculty member, teacher candidate, satisfaction, and technology use were significantlyrelated to each other. Also, four of the six scales, namely, the internship teacher, faculty member,principal, and technology use, were identified as the significant predictors of the pre-serviceteachers` satisfaction from their school internship.
Mechanical and Electronic Properties of MoS$_2$ Nanoribbons and Their Defects
C. Ataca,H. ?ahin,E. Aktürk,S. Ciraci
Physics , 2010, DOI: 10.1021/jp1115146
Abstract: We present our study on atomic, electronic, magnetic and phonon properties of one dimensional honeycomb structure of molybdenum disulfide (MoS$_2$) using first-principles plane wave method. Calculated phonon frequencies of bare armchair nanoribbon reveal the fourth acoustic branch and indicate the stability. Force constant and in-plane stiffness calculated in the harmonic elastic deformation range signify that the MoS$_2$ nanoribbons are stiff quasi one dimensional structures, but not as strong as graphene and BN nanoribbons. Bare MoS$_2$ armchair nanoribbons are nonmagnetic, direct band gap semiconductors. Bare zigzag MoS$_2$ nanoribbons become half-metallic as a result of the (2x1) reconstruction of edge atoms and are semiconductor for minority spins, but metallic for the majority spins. Their magnetic moments and spin-polarizations at the Fermi level are reduced as a result of the passivation of edge atoms by hydrogen. The functionalization of MoS$_2$ nanoribbons by adatom adsorption and vacancy defect creation are also studied. The nonmagnetic armchair nanoribbons attain net magnetic moment depending on where the foreign atoms are adsorbed and what kind of vacancy defect is created. The magnetization of zigzag nanoribbons due to the edge states is suppressed in the presence of vacancy defects.
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