Browsing by Author "Gunduz, Oguzhan"

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Evaluation of Current Diagnostic Methods for Covid-19
(Aip Publishing, 2020) Alpdagtas, Saadet; Ilhan, Elif; Uysal, Ebru; Sengor, Mustafa; Ustundag, Cem Bulent; Gunduz, Oguzhan
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is the agent responsible for the coronavirus disease of 2019 (COVID-19), which triggers lung failure, pneumonia, and multi-organ dysfunction. This enveloped, positive sense and single-stranded RNA virus can be transmitted through aerosol droplets, direct and indirect contacts. Thus, SARS-CoV-2 is highly contagious and has reached a pandemic level in a few months. Since COVID-19 has caused numerous human casualties and severe economic loss posing a global threat, the development of readily available, accurate, fast, and cost-effective diagnostic techniques in hospitals and in any places where humans spread the virus is urgently required. COVID-19 can be diagnosed by clinical findings and several laboratory tests. These tests may include virus isolation, nucleic acid-based molecular assays like real-time polymerase chain reactions, antigen or antibody-based immunological assays such as rapid immunochromatographic tests, enzyme-linked immunosorbent assays, immunofluorescence techniques, and indirect fluorescent antibody techniques, electrochemical sensors, etc. However, current methods should be developed by novel approaches for sensitive, specific, and accurate diagnosis of COVID-19 cases to control and prevent this outbreak. Thus, this review will cover an overview and comparison of multiple reports and commercially available kits that include molecular tests, immunoassays, and sensor-based diagnostic methods for diagnosis of COVID-19. The pros and cons of these methods and future perspectives will be thoroughly evaluated and discussed.
Functional Role of Crosslinking in Alginate Scaffold for Drug Delivery and Tissue Engineering: a Review
(Pergamon-elsevier Science Ltd, 2021) Aguero, Lisette; Alpdagtas, Saadet; Ilhan, Elif; Zaldivar-Silva, Dionisio; Gunduz, Oguzhan
The actual tendency exhibits continuous increment to use alginate polysaccharides in drug delivery and tissue engineering fields due to its attractive properties. Alginate pH-sensitiveness and its fabrication techniques have been extensively reported in the literature. However, in this review, the essential role of crosslinking process in the scaffold design will be highlighted. We discuss the possibility to use a different type of crosslinking to create proper biomimetic alginate hydrogels, emphasizing the possibility to improve alginate mechanical properties through chemical modification by covalent crosslinking or ionic combination with other polymeric materials. At the same time, the relevance of the degradation process and biocompatibility in these applications is also detailed described.