Browsing by Author "Kaya, M."
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Book Part Nanocatalytic Architecture for the Selective Dehydrogenation of Formic Acid(wiley, 2021) Baguc, I.B.; Kanberoglu, G.S.; Yurderi, M.; Bulut, A.; Celebi, M.; Kaya, M.; Zahmakiran, M.Formic acid (HCOOH) is a main by-product formed through many biomass processes and has recently been proposed as one of the most promising liquid organic hydrogen carrier material in the chemical hydrogen storage for the fuel cell applications. However, efficient hydrogen (H2) generation through catalytic formic acid dehydrogenation under mild thermodynamic conditions constitutes a major challenge because poisoning of active metal center exists in catalytic systems with carbon monoxide (CO) formed as an intermediate. In this chapter, we focus on the research advances on the formic acid dehydrogenation in the presence of different nanocatalysts including monometallic, bimetallic, and trimetallic nanoparticles in the form of alloy, core@shell, and physical mixture. The main advantages and drawbacks of these systems are presented by comparing their catalytic performances depending on additives, solvents, and temperature parameters. Additionally, the morphology, structure, and composition of these nanocatalysts as well as their synthesis protocols are discussed, and new synthesis strategies are proposed to enhance the catalytic performance of nanocatalysts in the formic acid dehydrogenation. © 2021 WILEY-VCH GmbH, Boschstr. 12, 69469 Weinheim, Germany.Article Noninvasive Assessment of Subclinical Atherosclerosis in Normotensive Gravidae With Gestational Diabetes(Urban & Vogel, 2014) Atay, A. E.; Simsek, H.; Demir, B.; Sakar, M. N.; Kaya, M.; Pasa, S.; Sit, D.Carotid artery intima-media thickness (CIMT), hyperhomocysteinemia, microalbuminuria, and nitric oxide reflect subclinical atherosclerosis and predict the risk of future cardiovascular events. We aimed to evaluate the presence of subclinical atherosclerosis and endothelial dysfunction in normotensive patients with gestational diabetes mellitus (GDM) noninvasively. We enrolled 41 normotensive patients with GDM and 44 healthy gravidae in the study. Serum homocysteine and nitric oxide levels, urinary albumin excretion (microalbuminuria), and CIMT were evaluated along with lipid parameters and anthropometric measurements. Patients with GDM had significantly higher levels of serum homocysteine, urinary albumin excretion, and increased CIMT (p < 0.001, p=0.005, and p < 0.001, respectively). Nitric oxide levels were significantly reduced in the patient group (p < 0.001). There was a significant difference between groups in terms of low-density lipoprotein (LDL) but not of high-density lipoprotein (HDL) and triglyceride levels. A significant correlation was observed between CIMT and serum LDL, HDL, homocysteine, nitric oxide levels, and urinary albumin excretion. Microalbuminuria was significantly correlated with serum homocysteine levels (p=0.03) but not with nitric oxide. Independent of elevated blood pressure, subclinical atherosclerosis and endothelial dysfunction exist in normotensive patients with GDM. Further studies with a large number of participants are required to clarify these data.