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RISS 인기검색어
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- 저자 : Ahmet Tas (검색결과 5 건)
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Ahmet Tas,Oktay Aydogdu,Mustafa Salti 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.10
The scattering and bound states of relativistic spinless particles with position-dependent mass are investigated in the framework of the improved Frost-Musulin potential, which is used to explain some properties of diatomic molecules. After we obtain approximate analytical solution of the Klein- Gordon equation, we find the normalized wave functions in terms of the hypergeometric functions in order to deal with the bound and the scattering states. We also analyze the scattering phase shifts and the bound states numerically.
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( Ayten Oguz ),( Ahmet Engin Atay ),( Adnan Tas ),( Gulseren Seven ),( Mehmet Koruk ) 대한소화기학회 2013 Gut and Liver Vol.7 No.1
Background/Aims: Biochemical parameters and acutephase proteins (APPs) may provide complementary data in patients with chronic hepatitis C (CHC). We aimed to evaluate the predictive role of APPs in the response to antiviral therapy. Methods: Forty-five patients underwent antiviral therapy. Serum ferritin, C-reactive protein (CRP), transferrin, albumin, alpha-1 acid glycoprotein (A1AG), and alpha-2 macroglobulin (A2MG) levels were examined at the initial evaluation and at the 4th, 12th, and 48th weeks. HCV RNA levels were examined at the initial evaluation and at the 12th and 48th weeks. Results: Ferritin, transferrin, A1AG, and A2MG levels were significantly higher in the patient group (p<0.05). CRP, ferritin, A1AG, and A2MG levels were significantly increased from baseline to the 4th week (p<0.05). The responders and nonresponders to antiviral therapy had insignificantly but remarkably different levels of CRP, ferritin, transferrin, A1AG, A2MG, and alanine aminotransferase (ALT) both at the initial evaluation and at the 12th week. Conclusions: Variations in ferritin, A1AG, A2MG, albumin, CRP, and transferrin levels are not alternatives to virological and biochemical parameters for predicting an early response to therapy in patients with CHC. However, the investigation of ALT levels and hepatitis C virus RNA in combination with acute-phase reactants may provide supplementary data for evaluating responses to antiviral therapy. (Gut Liver 2013;7:82-88)
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Bülent Çetin,Hakan Özer,Ahmet Cakir,Tas¸kin Polat,Atilla Dursun,Ebru Mete,Erdog˘an O¨ ztu¨rk,Melek Ekinci 한국식품영양과학회 2010 Journal of medicinal food Vol.13 No.1
The objective of this study was to determine the chemical compositions of the essential oil and hexane extract isolated from the inflorescence, leaf stems, and aerial parts of Florence fennel and the antimicrobial activities of the essential oil, hexane extract, and their major component, anethole, against a large variety of foodborne microorganisms. Gas chromatography and gas chromatography-mass spectrometry analysis showed that the essential oils obtained from inflorescence, leaf stems, and whole aerial parts contained (E)-anethole (59.28–71.69%), limonene (8.30–10.73%), apiole (trace to 9.23%), β-fenchyl acetate (3.02–4.80%), and perillene (2.16–3.29%) as the main components. Likewise, the hexane extract of the plant sample exhibited a similar chemical composition, and it contained (E)-anethole (53.00%), limonene (27.16%), γ-terpinene (4.09%), and perillene (3.78%). However, the hexane extract also contained less volatile components such as n-hexadecanoic acid (1.62%), methyl palmitate (1.17%), and linoleic acid (1.15%). The in vitro antimicrobial assays showed that the essential oil, anethole, and hexane extract were effective against most of the foodborne pathogenic, saprophytic, probiotic, and mycotoxigenic microorganisms tested. The results of the present study revealed that (E)-anethole, the main component of Florence fennel essential oil, is responsible for the antimicrobial activity and that the essential oils as well as the hexane extract can be used as a food preservative. This study is the first report showing the antimicrobial activities of essential oil and hexane extract of Florence fennel against probiotic bacteria.
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Eyelid Tumors: Clinical Data from an Eye Center in Ankara, Turkey
Gundogan, Fatih Cakir,Yolcu, Umit,Tas, Ahmet,Sahin, Omer Faruk,Uzun, Salih,Cermik, Hakan,Ozaydin, Sukru,Ilhan, Abdullah,Altun, Salih,Ozturk, Mustafa,Sahin, Fahri,Erdem, Uzeyir Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.10
Introduction: The aim of the study was to explore the distribution of eyelid tumors in Ankara, the capital city of Turkey, from a histopathological point of view. Materials and Methods: Medical records of 1,502 patients who had eyelid surgery because of tumoral lesions were retrospectively reviewed after obtaining institutional review board approval. A total of 1,541 lesions with histopathologic diagnosis were included. Inflammatory tumoral lesions were excluded. The lesions were categorized into three groups according to the origin: epidermal, adnexal tumors and 'others', including melanocytic, neural and vascular lesions. Results: Of the total of 1,541, 908 lesions were epidermal in origin. Only 22 (1.5%) were malignant, and 6.0% was premalignant lesions such as actinic keratosis and Bowen's disease. Twenty-one of 22 malignant lesions were basal cell carcinoma. There was only one patient with squamous cell carcinoma and no sebaceous cell carcinoma. Among the benign tumors (92.5%), squamous papilloma was the most frequent (21.8% of all lesions). The other frequent lesions were nevus (17.6%), seborrheic keratosis (17.3%), hydrocystomas (10.6%), xanthelasma (7.6%) and epidermal cysts (7.2%). Conclusions: The results of this study are in accordance with published literature. The absence of sebaceous cell carcinomas needs to be stressed.
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Selami Demirelli,Sule Karakelleoglu,Fuat Gündog˘du,Muhammed Hakan Tas,Ahmet Kaya,Hakan Duman,Hüsnü Deg˘irmenci,Hikmet Hamur,Ziya Simsek 대한심장학회 2013 Korean Circulation Journal Vol.43 No.7
Background and Objectives: The aim of this study was to investigate the impact of treatment with oral trimetazidine (TMZ) applied before and after percutaneous coronary interventions (PCI) on short-term left ventricular functions and plasma brain natriuretic peptide (BNP) levels in patients with non-ST segment elevation myocardial infarction (NSTEMI) undergoing PCI. Subjects and Methods: The study included 45 patients who were undergoing PCI with the diagnosis of NSTEMI. The patients were ran-domized into two groups. The first group (n=22) of the patients hospitalized with the diagnosis of NSTEMI was given conventional therapy plus 60 mg TMZ just prior to PCI. Treatment with TMZ was continued for one month after the procedure. TMZ treatment was not given to the second group (n=23). Echocardiography images were recorded and plasma BNP levels were measured just prior to the PCI and on the 1st and 30th days after PCI. Results: The myocardial performance index (MPI) was greater in the second group (p=0.02). In the comparison of BNP levels, they signifi-cantly decreased in both of the groups during the 30-day follow-up period (29.0±8 and 50.6±33, p<0.01 respectively). However, decreasing of BNP levels was higher in the group administered with TMZ. The decrease of left ventriclular end-diastolic volume was observed in all groups at 30 days after intervention, but was higher in the group administered with TMZ (p=0.01). Conclusion: Trimetazidine treatment commencing prior to PCI and continued after PCI in patients with NSTEMI provides improvements in MPI, left ventricular end diastolic volume and a decrease in BNP levels.
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