Aksaray Üniversitesi Kurumsal Akademik Arşivi
DSpace@Aksaray, Aksaray Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Physical properties of Mo2C monolayer by substitutional doping with Co/Cu atoms
(Springer Nature, 2025) Bölen, Emre; Deligöz, Engin; Özışık, H.
Monolayer Mo2C, a member of the MXene family, uniquely combines metallic and semiconducting properties, making it a promising candidate for various applications such as electronics, energy storage, thermoelectric, and spintronic. This study reported a comprehensive investigation of the structural, mechanical, dynamical, electronic, magnetic, and transport properties of pure and doped Mo2C monolayers using first-principles density functional theory. The transport properties are investigated in terms of transmission spectrum and pathways. The Mo2C shows dynamical and mechanical stability, auxetic behavior with negative Poisson's ratio, high isotropic mechanical stability and good electrical conductivity. Transition metal atoms, cobalt (Co) and copper (Cu) doping, were used to optimize the properties of the material. Electronic band structure analysis confirms the metallic nature of both pure and doped Mo2C. The result of the present study provides insight into how to improve the electronic transport properties of pure and doped Mo2C, which is used in spintronic applications.
Evaluation of the effect of red cabbage waste on performance, egg quality, and yolk oxidative stability of laying Japanese quails (Coturnix coturnix Japonica)
(Springer Science and Business Media B.V., 2025) Gümüş, Erinç; Sevim, Behlül; Sırakaya, Selim; İriş, Canan; Kahraman, Oğuzhan; Sarmiento-García, Ainhoa
This study investigates the effects of red cabbage waste (RCW) as a dietary supplement on the performance, egg quality, and oxidative stability of yolk in laying Japanese quails. Given its rich phenolic content, RCW has been investigated as a natural feed additive to reduce food waste and enhance poultry diets. In a six-week trial, 120 quails were divided into 4 groups with 5 replicates and fed diets with 0.0%, 0.5%, 1.0%, and 2.0% RCW. Performance parameters, internal and external egg quality, and antioxidant status were measured. RCW supplementation had no significant impact on overall quail performance. Quails fed with 0.5% RCW showed notable improvements in internal egg quality, especially in the albumen index, Haugh unit, and eggshell thickness. Additionally, incorporating 0.5% RCW into the diet improved the yolk’s antioxidant activity, as evidenced by reduced MDA levels. However, other egg quality traits, including the antioxidant capacity of the yolk, had deteriorated with concentrations above 0.5%, indicating that a moderate inclusion of 0.5% RCW is the most favourable option. The findings underscore that RCW could be sustainably used to improve egg quality without compromising performance, while managing food waste, presenting a potential circular economy solution. Nevertheless, further research is encouraged to optimize RCW levels and fully understand its benefits in poultry feed.
Magnetite graphene oxide incorporated κ-carrageenan/alginate nanobiocomposite for photothermal therapy and multi-stimuli-responsive sunitinib release
(Editions de Sante, 2025) Sonkaya, Ömer; Güncüm, Enes; Işıklan, Nuran
Photothermal therapy is emerging as a promising approach for cancer treatment due to its minimally invasive nature, reduced systemic toxicity, and potential for targeted therapy. The practical implementation of photothermal therapy necessitates the development of efficient and multifunctional photothermal agents. The aim of this study was to develop magnetic nanobiocomposites with photothermal, pH- NIR-, and magnetic field-responsive properties. Magnetite graphene oxide (GO@Fe3O4) was prepared by depositing Fe3O4 magnetite nanoparticles onto graphene oxide (GO). The multifaceted nanobiocomposites were synthesized by combining GO@Fe3O4 with polymers of κ-carrageenan/alginate (CR/A) blend loaded with sunitinib (Su), an anticancer drug, using the emulsion method. These CR/A@GO@Fe3O4@Su nanobiocomposites were characterized using different analytical techniques including XRD, FTIR, SEM/TEM, TGA-DSC, VSM, and DLS. Under NIR (808 nm) irradiation, the CR/A@GO@Fe3O4@Su nanobiocomposite showed a satisfactory photothermal effect (η = 19.26 %). In vitro release studies demonstrated controlled, pH-, NIR-, and AMF-responsive release of sunitinib in a range of 20 % and 100 %. The rate of drug release was higher in an intestinal condition (74.04 %) compared to that in an acidic condition (20.34 %) for CR/A@(GO@Fe3O4)3@Su nanobiocomposite. MTT assays revealed that the CR/A@GO@Fe3O4@Su nanobiocomposite exhibited an improved effect when combined with photothermal therapy and chemotherapy at 0.03125 and 0.0625 mg/mL, resulting in excellent cytotoxicity (cell viability of 10.78 % and 10.57 %) towards cancer cells. The obtained results suggest that the formulated multi-responsive CR/A@GO@Fe3O4@Su nanobiocomposites could be a promising candidate for photothermal therapy in cancer treatment.
Cl−, Na+ and Mg2+ Adsorption and Electronic Properties on 2-Octyl Acrylate and Isobornyl Acrylate Monomers: A Comprehensive DFT Study
(Multidisciplinary Digital Publishing Institute (MDPI), 2025) Bölen, Emre; Dolado, Jorge S.; Ayuela, Andrés
The design of advanced functional materials from polymers involving 2-octyl acrylate and isobornyl acrylate monomers is crucial for applications such as biofouling resistance, coatings, UV-curable films, and use in marine environments. In this study, we investigated the adsorption and electronic properties of 2-octyl acrylate and isobornyl acrylate monomers in the presence of Cl−, Na+, and Mg2+ ions using Density Functional Theory calculations. Adsorption energies, quantum descriptors, and electrostatic potential maps were analyzed to elucidate ion-specific interactions with these monomers. Our findings indicate that Mg2+ ions exhibit the strongest interactions due to their high charge density, followed by Na+ and Cl− ions, which show moderate and weak adsorption, respectively. Density of states analyses revealed that Mg2+ significantly lowers HOMO and LUMO levels, narrowing the gap and stabilizing the system, while Cl− ions result in a smaller gap and weaker interactions. Electrostatic potential maps further confirmed these trends, correlating ion adsorption sites with molecular charge distributions. This study highlights the critical role of ion adsorption and its associated electronic properties and paves the way for future advancements in optimizing 2-octyl acrylate and isobornyl acrylate-based materials for applications such as coatings and use in marine environments.
Does major depressive disorder affect the perception of financial threat and willingness to change financial behavior
(Elsevier B.V., 2025) Hamurcu, Çağrı; Hamurcu, H. Dilek; Uğur, Oğuzhan; Çayköylü, Ali
This study aimed to compare individuals diagnosed with major depressive disorder (MDD) with a healthy control group in terms of perceived financial threat and willingness to change financial behavior. It also examined whether the severity of depression in people with MDD affects perceived financial threat and willingness to change financial behavior, and how financial threat affects the willingness to change financial behavior. The study included 266 patients diagnosed with MDD and 266 healthy volunteers. The financial threat scale, the willingness to change financial behavior scale, and the Beck Depression Inventory are used. Results showed that individuals with MDD experience a higher perception of financial threat and a lower willingness to change financial behavior compared to healthy individuals. The severity of depression in individuals with MDD positively affects the perception of financial threat. However, this severity does not directly affect willingness to change financial behavior; instead, it creates an indirect effect through perceived financial threat. Moreover, perceived financial threat in MDD patients positively influences their willingness to change financial behavior. This study can make significant contributions to both behavioral finance and psychiatry literature in terms of revealing the effects of mental health on perceptions and behaviors regarding financial issues. The research offers new perspectives to develop practical implications on how mental health problems can be evaluated together with financial decision-making processes, how multifaceted evaluations can be conducted regarding the financial behavior of people with depression, and how predictions can be made by looking at both individuals and financial markets from these aspects.
