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- 저자 : ( Duygu Uysal ) (검색결과 2 건)
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Duygu Uysal Zıraman,Özkan Murat Doğan,Bekir Zühtü Uysal 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.9
Hydrogen is getting increasing attention as a medium for energy storage, and sodium borohydride is accepted as a suitable carrier for hydrogen. The main product of the process by means of which hydrogen is produced from sodium borohydride is sodium metaborate. Our aim was to find an alternative use for sodium metaborate and specifically investigating the feasibility to use it for carbon dioxide capture from flue gases. The products of this chemical absorption are sodium carbonate, sodium bicarbonate and boric acid, all of which are industrially important chemicals. A bubble column was used in the experiments. Oxygen desorption technique was employed to determine the liquid side physical mass transfer coefficient. Chemical mass transfer coefficient was determined by absorption of carbon dioxide from its mixture with nitrogen into sodium metaborate solution. Enhancement factor was then calculated and a correlation was developed for it.
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( Betul Borku Uysal ),( Feray Akbas ),( Esma Altunoglu ),( Gulhan Ipek Deniz ),( Duygu Uysal ),( Harun Uysal ),( Hanife Usta Atmaca ),( Yasin Yuksel ),( Hale Aral ),( Guven Cetin ),( M Cem Ar ),( Must 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Anemia is an accelerating problem among patients with heart failure. In this study, we investigated whether anemia in heart failure was related to hepcidin level. Methods: Totally 70 patients; 50 patients with heart failure and 20 otherwise healthy subjects with no history of a chronic illness including heart failure as control group, were included in the study. Heart failure was verifi ed by echocardiography in each subject and patients were defi ned as ones with reduced ejection fraction (HFrEF) if EF = 40% and with preserved ejection fraction (HFpEF) if EF 40-50%. Exclusion criteria included presence of kidney failure (serum creatinine level>1.4), history of hemorrhage (gastrointestinal or severe menstrual bleeding), chronic liver disease (ALT>2 folds), hematologic disease, iron replacement therapy or blood transfusion in the past six months, hypothyroidism, autoimmune disease and manifest infection. Results: There was no correlation between hepcidin concentration and age, weight, creatinine, iron, vitamin B12, folate, white blood cell (WBC), platetelet, mean corpuscular volume, ESR, ejection fraction (EF) (p > 0,05). There was a positive correlation between hepcidin level and urea, ferritin, hemoglobin, hematocrite, C-reactive protein (p < 0,05). Hepcidin levels of anemic heart failure patients were signifi cantly lower than the non-anemic heart failure patients (p < 0,05). Conclusions: We found that serum hepcidin level in anemic patients with heart failure was lower than in heart failure patients without anemia. Previously, progression of heart failure was found to be associated with decline in circulating hepcidin and the development of iron defi ciency and low hepcidin level was related to unfavorable out come. We believe that iron defi ency occurs as a result of infl ammatory process in heart failure and therefore hepcidin concentrations decrease as a response. However, long-term follow up studies are needed.
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