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    Formulation of organic and inorganic hydrogel matrices for immobilization of ß-glucosidase in microfluidic platform
    (Wiley-VCH Verlag, 2017) Kazan A.; Heymuth M.; Karabulut D.; Akay S.; Yildiz-Ozturk E.; Onbas R.; Muderrisoglu C.; Sargin S.; Heils R.; Smirnova I.; Yesil-Celiktas O.
    The aim of this study was to formulate silica and alginate hydrogels for immobilization of ß-glucosidase. For this purpose, enzyme kinetics in hydrogels were determined, activity of immobilized enzymes was compared with that of free enzyme, and structures of silica and alginate hydrogels were characterized in terms of surface area and pore size. The addition of polyethylene oxide improved the mechanical strength of the silica gels and 68% of the initial activity of the enzyme was preserved after immobilizing into tetraethyl orthosilicate–polyethylene oxide matrix where the relative activity in alginate beads was 87%. The immobilized ß-glucosidase was loaded into glass–silicon–glass microreactors and catalysis of 4-nitrophenyl ß-d-glucopyranoside was carried out at various retention times (5, 10, and 15 min) to compare the performance of silica and alginate hydrogels as immobilization matrices. The results indicated that alginate hydrogels exhibited slightly better properties than silica, which can be utilized for biocatalysis in microfluidic platforms. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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    Heart Failure Awareness Survey in a Turkish Population: HFAS-TR; [Türk Toplumunda Kalp Yetersizliği Farkındalık Araştırması: HFAS-TR]
    (Turkish Society of Cardiology, 2024) Karabulut D.; Günay Ş.; Şekerci S.S.; Aydın E.; Köz K.; Katkat F.; Saraç İ.
    Objective: Heart failure is a leading cause of death and the most common diagnosis leading to hospitalization. Its awareness is lower than that of other cardiovascular diseases, both in the general population and among patients with heart failure (HF). This study aimed to establish the current level of knowledge about HF in patients with HF with reduced ejection fraction (HFrEF) and mildly reduced ejection fraction (HFmrEF) in Türkiye. Methods: This questionnaire-based survey study is multicenter, conducted across 34 centers from December 2021 to July 2022. We performed a survey consisting of two sets of questions focusing on individual characteristics of the patients and HF-related knowledge. Results: The study included a total of 2,307 outpatient HF patients, comprising 70.5% males and 29.5% females with a mean age of 64.58 ± 13 (56-74) years and a mean body mass index value of 32.5 ± 10 kg/m2. HFrEF and HFmrEF were determined in 74.7% and 25.3% of patients, respectively. Thirty percent of the patients were unaware that they had HF. While 28.7% of the patients thought that they had sufficient information about HF, 71.3% believed they lacked adequate knowledge. In the study, 25.2% of the participants identified dyspnea, 22% identified tiredness, and 25.4% identified leg edema as the most common symptoms of HF. Only 27.4% of patients recognized all three typical symptoms of HF. Conclusion: We found that the study population’s knowledge about HF symptoms and the nature of the disease was poor. Educational and awareness activities are necessary to optimize outcomes and benefits. © 2024 Turkish Society of Cardiology. All rights reserved.