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Highly Porous Biocomposite Scaffolds Fabricated by Chitosan/Alginate/Diatom for Tissue Engineering
Yusuf Özcan,Dicle Erden Gönenmiş,Esranur Kızılhan,Cem Gök 한국고분자학회 2022 폴리머 Vol.46 No.4
Tissue scaffolds based composite material have attracted great attention in the field of bone tissue engineering. Therefore, researchers are looking for new materials to be used for composite tissue scaffolding. We aimed to producethe effect of high porous and non-toxic scaffolds as hydrogels with two different contents using chitosan, alginate anddiatom. Beads were made from alginate and alginate/diatom hydrogels and additionally coated in dilute chitosan solution. Obtained alginate-chitosan (AC) and alginate/diatom-chitosan (ADC) beads were lyophilized. High-porous AC scaffoldand both high-porous and nano-porous ADC scaffold were examined in terms of density, porosity, swelling tests and morphologic, chemical, cytotoxic analysis. In this study, high porosity with approximately 450 μm pore size was found forAC and ADC scaffolds. The average pore size of diatom in ADC was acquired as 280 nm. Moreover, AC and ADC didnot show any cytotoxic effects on HEK293 cells. Our results clearly indicated that scaffolds have an alternative potentialin the field of tissue engineering
Recurrent and Massive Life Threatening Epistaxis due to Nasal Heroin Usage
Hüseyin Yaman,Yusuf Aydın,Süleyman Yılmaz,Elif Önder,Ender Güçlüm,Özcan Öztürk 대한이비인후과학회 2011 Clinical and Experimental Otorhinolaryngology Vol.4 No.3
Epistaxis, active bleeding from the nose, is a common ear nose and throat emergency, and can be severe or even fatal. We report a severe life threatening recurrent massive nasal bleeding caused by intranasal heroin use that has not hitherto been reported in the English literature. A 24-year-old male who took heroin several times nasally presented with massive nasal bleeding. A blood transfusion and an operation to halt nasal bleeding were required. The patient did not experience a bleeding attack 2 months following cessation of nasal heroin use.
Cemil Çelik,Abdullah Bolu,Taner Öznur,Mehmet Sinan Aydın,Yusuf Tokgöz,Özcan Uzun 대한정신약물학회 2019 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.17 No.1
Objective: Myostatin is a growth factor which is investigated regarding musculoskeletal system. Albeit its effect on muscle mass is known, it is considered likely having other unknown effects as well, particularly on central nervous system. With this study, it is aimed to find out that what type of effect electroconvulsive therapy (ECT) does on myostatin in patients with treatment resistant depression. Methods: Twenty-nine patients with treatment resistant major depression and thirty healthy volunteers were included in the study. Pre- and post-ECT levels of myostatine were compared; also this results were compared to healthy controls. Results: For 29 patients with treatment-resistant major depression, the pre-treatment mean myostatin level was 0.95±0.32 ng/ml and post-therapy myostatin level was 11.05±6.97 ng/ml. As a result of this study, it is found that ECT affects serum myostatin levels to a significant degree (t=4.17, p<0.05). It is also found that there was a significant relation between serum myostatin levels and depression scores (r=0.392, p<0.05). Conclusion: With the present study and similar ones, it can be understood that how ECT achieves its effectiveness biologically.