WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7150
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Article Citation - WoS: 1Citation - Scopus: 1Peptide-Functionalized Hydrocolloid Bioink for 3D Bioprinting in Dental Tissue Engineering(Elsevier, 2025) Guner, Elif; Yildirim-Semerci, Ozum; Altan, Zeynep; Arslan-Yildiz, AhuDeveloping biomimetic peptide-based biomaterials has utmost importance to enhance mineralization offering an innovative approach for dental tissue regeneration. This study comprises development and characterization of a novel peptide-based hybrid bioink for dental tissue engineering applications by integrating P11-4 peptide and Gelatin (Gel) into glucuronoxylan-based quince seed hydrocolloid (QSH). Combining polysaccharide and peptide-based hydrogels enhanced cell adhesion and mineralization. Morphological analysis showed that P11-4 increased porosity, while rheological tests confirmed that QSH/Gel/P11-4 bioink has tunable viscosity, which is suitable for 3D bioprinting. Optimized bioprinting parameters were determined to be 25G nozzle diameter, 10 mm/s speed of movement, 0.1 mm layer height, and pressure values of 9.0 and 7.0 psi for QSH/Gel and QSH/ Gel/P11-4, respectively. Moreover, the addition of P11-4 significantly increased protein adsorption without affecting swelling capacity. 3D cell culture studies were conducted using SaOS-2 (human osteosarcoma) cells, then biocompatibility, high cell viability, favored adhesion, and proliferation were confirmed by Live/Dead and MTT assays. Alizarin Red Staining (ARS) and EDX analysis verified that P11-4 promoted mineral deposition by increasing Calcium (Ca2+) accumulation in QSH/Gel/P11-4 scaffolds, suggesting that developed bioink can mimic native ECM microenvironment for dental tissue. Overall, the developed hybrid bioink shows superior printability and bioactivity, which makes it a promising material for 3D bioprinting applications in dental tissue engineering.Article Citation - WoS: 1Citation - Scopus: 1Mineralization of Olive Mill Wastewater Under Hydrothermal Conditions(Desalination Publications, 2019) Ersanlı, Çağlar; Yüksel Özşen, AslıOlive mill wastewater (OMW) is highly dangerous for land and aquatic environments because of its high phenolic content, acidity, and salinity. Hence, hydrothermal degradation of OMW in subcritical water medium with and without using external oxidizer (H2O2) was studied to decrease its total organic carbon (TOC), total phenolic content (TPC), and color. Effects of reaction temperature (150 degrees C-250 degrees C), reaction time (30-120 min), and H2O2 content (0-100 mM) on TOC and TPC of OMW were investigated. Box-Behnken-type experimental design and statistical analysis (analysis of variance) were practiced by Design Expert 11. According to statistical analysis, effect of reaction temperature significantly affected TOC removal efficiency. The best TOC reduction (31.65%) was achieved without using H2O2 at 250 degrees C for 120 min.Article Citation - WoS: 4Citation - Scopus: 7Heterogeneous Photocatalytic Degradation and Mineralization of 2,4-Dichlorophenoxy Acetic Acid (2,4-D): Its Performance, Kinetics, and Economic Analysis(Desalination Publications, 2019) Doğdu Okçu, Gamze; Ökten, Hatice Eser; Yalçuk, ArdaThe photocatalytic degradation and mineralization of commercial solution of 2,4-dichlorophenoxy-acetic acid (2,4-D) was carried out by UVA/P25 TiO 2 and UVA/P25 TiO 2 /H 2 O 2 oxidation processes under batch-mode conditions. In UVA + TiO 2 photocatalysis (TiO 2 1.5 gL −1 , pH 5, initial 2,4-D 25 mg L −1 ), 97.47% ± 0.27% degradation, 39.89% ± 3.42% mineralization, and 65.52% ± 4.88% oxidation were achieved in 180 min, and in UVA +TiO 2 + H 2 O 2 photocatalysis (TiO 2 1.5 g L −1 , pH 5, initial 2,4-D 25 mg L −1 , H 2 O 2 150 mg L −1 ), 99.74% ± 0.08% degradation, 55.99% ± 2.67% mineralization, and 82.49% ± 1.90% oxidation were obtained in 180 min. The pseudo-first-order kinetic model fitted the experimental data well, and the photocatalytic degradation process was explained by the modified L–H model; k c and K LH were 1.293 mg L −1 min −1 and 0.232 L mg −1 , respectively. Fourier transform infrared (FTIR) spectroscopy spectra and scanning electron microscopy (SEM) analysis indicated degradation of organic bonds of the herbicide and adsorption of 2,4-D particles onto the TiO 2 catalyst during 24-h experiments. Moreover, the dependence of k app on the half-life time was determined by calculating the electrical energy per order (E EO ). UVA/TiO 2 /H 2 O 2 photocatalysis may be applied as a pretreatment to 2,4-D herbicide wastewater at a pH of 5 for biological treatment.Article Citation - WoS: 45Polymers and Inorganics: a Happy Marriage?(Polymer Society of Korea, 2007) Wegner, Gerhard; Demir, Mustafa Muammer; Faatz, Michael; Gorna, Katazyrna; Munoz-Espi, Rafael; Guillemet, Baptiste; Gröhn, FranziskaThe most recent developments in two areas: (a) synthesis of inorganic particles with control over size and shape by polymer additives, and (b) synthesis of inorganic-polymer hybrid materials by bulk polymerization of blends of monomers with nanosized crystals are reviewed. The precipitations of inorganics, such as zinc oxide or calcium carbonate, in presence and under the control of bishydrophilic block or comb copolymers, are relevant to the field of Biomineralization. The application of surface modified latex particles, used as controlling agents, and the formation of hybrid crystals in which the latex is embedded in otherwise perfect crystals, are discussed. The formation of nano sized spheres of amorphous calcium carbonate, stabilized by surfactant-like polymers, is also discussed. Another method for the preparation of nanosized inorganic functional particles is the controlled pyrolysis of metal salt complexes of poly (acrylic acid), as demonstrated by the syntheses of lithium cobalt oxide and zinc/magnesium oxide. Bulk polymerization of methyl methacrylate blends, with for example, nanosized zinc oxide, revealed that the mechanisms of free radical polymerization respond to the presence of these particles. The termination by radical-radical interaction and the gel effect are suppressed in favor of degenerative transfer, resulting in a polymer with enhanced thermal stability. The optical properties of the resulting polymer-particle blends are addressed based on the basic discussion of the miscibility of polymers and nanosized particles.