Poliamin polimeri ile platin (IV) adsorpsiyonunun incelenmesi

06.03.2018 tarihli ve 30352 sayılı Resmi Gazetede yayımlanan “Yükseköğretim Kanunu İle Bazı Kanun Ve Kanun Hükmünde Kararnamelerde Değişiklik Yapılması Hakkında Kanun” ile 18.06.2018 tarihli “Lisansüstü Tezlerin Elektronik Ortamda Toplanması, Düzenlenmesi ve Erişime Açılmasına İlişkin Yönerge” gereğince tam metin erişime açılmıştır.Bu çalışmada, 1,3,5-triazin pentaetilenhekzamin (TAPEHA) polimeri ile klorür içeren çözeltilerden Pt (IV) iyonlarının adsorpsiyonu incelendi. Pt (IV) iyonlarının kesikli yöntem ile yapılan adsorpsiyon deneylerinde sulu fazın asidikliği, karıştırma süresi, Pt (IV) iyonlarının başlangıç konsantrasyonu ve sıcaklık gibi adsorpsiyonu etkileyen faktörler araştırıldı ve optimize edildi. Adsorpsiyondan sonra çözelti ortamında adsorplanmadan kalan Pt (IV) iyonlarının derişimi alevli atomik absorpsiyon spektrometresi kullanılarak tayin edildi ve başlangıç derişimi ile son denge derişimi farkından yararlanılarak polimerin gramı başına adsorplanan Pt miktarı hesaplandı. Pt (IV) iyonlarının adsorpsiyonu, çözeltinin hidronyum derişiminin 0,1 M olduğunda maksimum olduğu ve hidronyum derişiminin artması ile azaldığı bulundu. Pt (IV) iyonlarinin adsorpsiyonu sıcaklığın artması ile düştüğü bulundu. Karıştırma süresinin Pt (IV) adsorpsiyonunda etkili olduğu, karıştırma süresinin artması ile Pt(IV) adsorpsiyonunun denge durumu oluşana kadar arttığı ve sistemin dengeye erişme süresinin 24 saat olduğu bulundu. Pt (IV) iyonlarının başlangıç konsantrasyonunun artması da TAPEHA polimerinin kapasitesinin doygunluğa erişmesine kadar Pt (IV) adsorpsiyonunu artırdığı gözlendi. Pt (IV) iyonlarının adsorpsiyon kinetiği partikül içi difüzyon modeli, pseudo birinci ve ikinci derece kinetik modeller kullanılarak incelendi ve Pt(IV) adsorpsiyon kinetiğinin pseudo ikinci derece kinetik model ile uyumlu olduğu bulundu. Pt (IV) iyonlarının adsorpsiyon dengesi Langmuir ve Freundlich eşitlikleri kullanılarak araştırıldı. Pt (IV) iyonlarının adsorpsiyonunun Langmuir eşitliği ile uyumlu olduğu ve hazırlanan TAPEHA polimerinin Pt (IV) için maksimum adsorpsiyon kapasitesinin 909,1 mg/g olduğu bulundu.In this study, adsorption of Pt (IV) ions from containing chloride solutions by 1,3,5-triazine pentaethylenhexamine (TAPEHA) polymer was investigated. The effective factors on the batch adsorption of Pt (IV) such as of acidity of aqueous phase, contact time, initial concentration and temperature were investigated and optimized. Concentration of Pt (IV) remaining in the solution after adsorption was measured using flame atomic absorption spectrometer and the adsorbed amount of Pt per gram of the polymer was calculated from difference of initial concentration and the final equilibrium concentration. Adsorption of Pt (IV) was found to be maximal at 0.1M hydronium concentration and Pt (IV) adsorption was decreased by increasing of hydronium concentration. It was found to be increasing of temperature was caused to decrase in adsorption of Pt (IV). The contact time was found to be effective for adsorption of Pt, increasing of the time increases the adsorption of Pt (IV) until equilibrium condition occurs and the time to reach equilibrium was found to be 24 hours. Increasing of the initial concentration of Pt (IV) ions enhanced the adsorption until it reaches a saturation capacity of TAPEHA polymer. Pt (IV) adsorption kinetics was examined using kinetic models such as intra-particle diffusion model, pseudo first and second order equation and adsorption of Pt (IV) was found to be compatible with pseudo second order kinetic model. The equilibrium of Pt (IV) was investigated by using Langmuir and Freundlich equations. Adsorption of Pt (IV) was found to be compatible with Langmuir equation providing an adsorption capacity of TAPEHA 909.1 mg/g for Pt (IV)

A Comparison of the Results of Turkey in the 2003-2006-2009 Pisa Exams According to Geographical Regions and Type of Schools

AbstractNowadays, because of the globalization and the recent developments with in the educational systems, in Middle, South and North American, East Asian and North African and the European Union member countries, tests, such as PISA, TIMSS, and PIRLS, are administered to assess the achievement of the students at international level. This research is limited to only PISA, and the research question can be stated as “what is the general situation in Turkey according to PISA, 2003-2006-2009 exams results?” The results and recommendations are provided in the full text

An Example of Decentralized Management in Education: Provincial Directory Model

In Turkey, two types of administrative structures existed in the fields of National Education: “the central” and “provincial” institutions. However, between 1926-1931, the Locality model was implemented. Locality can be considered as a local administration formed in the provincial organization of the Ministry of Education by the law number 1834 between the years 1926–1931. Within this arrangement, the provincial structure of Turkey was divided into 13 provincial regions. In every provincial region, there was one administrator called “emin[1]” equipped with extensive responsibilities. Then, there was one director of education under the supervision of the emin and other sub-units enabling the implementation of provincial directory. In the “Provincial Directory Model”, “The Decentralized Administration” problems could be solved more efficiently, time and resources could be saved by the “Local Directory” within the authorization of emin without consulting the center. Following 1931, this model was rejected without any logical reasons and “the centralized model”, which is still being implemented, has emerged. In this model, the expenses of labor, resources and time have been increasing as the problems arising in the province are attempted to be solved in the center. [1]Emin means director

Neutrophil/lymphocyte ratio is associated with right ventricular dysfunction in patients with acute inferior ST-segment elevation myocardial infarction

Background: Acute inferior ST-segment elevation myocardial infarction (STEMI) is associated with increased in-hospital morbidity and mortality particularly among patients with coexisting right ventricular (RV) involvement. High neutrophil to lymphocyte ratio (NLR) is an independent predictor of major adverse cardiac events and mortality in patients with myocardial infarction. This study evaluated the relationship between the NLR and RV dysfunction (RVD) in patients with inferior STEMI who underwent primary percutaneous coronary intervention (PCI). Methods: A total of 213 subjects with inferior STEMI were divided into two groups according to the presence of RVD. The groups were compared according to NLR and receiver operating characteristic (ROC) analysis was performed to access the predictability of NLR on having RVD. Results: The NLR was significantly higher in the group with RVD compared to that without RVD (p < 0.001). In ROC analysis, NLR > 3.5 predicted RVD with sensitivity of 83% and specificity of 55%. In a multivariate regression analysis, NLR remained an independent predictor of RVD (OR 1.55, 95% CI 1.285–1.750, p < 0.001). Conclusions: NLR was an independent predictor of RVD in patients with inferior STEMI undergoing primary PCI.

Impact of Coronary Collateral Circulation on In-Hospital Death in Patients with Inferior ST Elevation Myocardial Infarction

Objectives. Coronary collateral circulation (CCC) may limit the size of right ventricular (RV) infarcts but does not fully explain the relationship between CCC and clinical adverse events in patients with inferior STEMI. In this study, it was aimed to assess the relationship between preintervention angiographic evidence of CCC and clinical outcomes in patients with inferior STEMI who have undergone percutaneous coronary intervention. Methods. A total of 235 inferior STEMI patients who presented within the first 12 hours from the symptom onset were included. CCC to the right coronary artery (RCA) before angioplasty were angiographically assessed, establishing two groups: 147 (63%) patients without CCC and 88 (37%) with CCC according to presence of CCC. Results. RV infarction, complete atrioventricular block, VT/VF, cardiogenic shock, and in-hospital death were noted less frequently in patients with CCC than in those without CCC. Absence of CCC to RCA was found to be the independent predictor for in-hospital death among them (odds ratio 4.0, 95% CI 1.8–12.6; p=0.03). Conclusion. Presence of angiographically detectable CCC was associated with better in-hospital outcomes including RV infarction, complete AV block, cardiogenic shock, and VT/VF in patients with inferior STEMI

Woven right coronary artery: A rare coronary anomaly

Woven coronary artery is an extremely rare anomaly in which epicardial coronary arteries divided into thin tunnel-like channels. WCA is thought to be a benign condition, however, it was associated with myocardial infarction and ischemia in some case reports. We present a 61-year-old male patient with woven right coronary artery