Recep Tayyip Erdoğan Üniversitesi Kurumsal Akademik Arşivi
DSpace@RTEÜ, Recep Tayyip Erdoğan 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 yayınların etkisini artırmak için telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
In Silico characterization of acylamidase from Actinoalloteichus hoggarensis: A promising biocatalyst for the bioremediation of persistent organic pollutants
(Elsevier, 2026) Zergoun, Sara; Abayahia, Ikrame; Bakli, Mahfoud; Beriş, Fatih Şaban; Ahmad Hidayat, Ahmad Fadhlurrahman; Bin Mohamad, Saharuddin; Munir, Muhammad
Widespread contamination by persistent organic micropollutants, particularly polycyclic aromatic hydrocarbons (PAHs) from petrochemical activities, poses risks to ecosystems and human health, necessitating sustainable remediation strategies. Enzymatic bioremediation offers a promising alternative, with amidases emerging as versatile catalysts. This study investigates the catalytic potential of an acylamidase from Actinoalloteichus hoggarensis , a thermotolerant and halotolerant actinobacterium isolated from the Algerian Sahara Desert, whose extremophilic origin suggests inherent stability for harsh conditions. Using a comprehensive in silico approach, the enzyme's structural and functional properties were characterized, and its interactions with 34 micropollutants were evaluated via molecular docking. A high-quality three-dimensional model was generated and validated. Conserved domain analysis classified the enzyme within the amidase signature family. Molecular docking revealed strong binding affinities across diverse contaminants. Among PAHs, benzo[ a ]pyrene exhibited the strongest affinity, followed by chrysene and anthracene. The enzyme also showed notable interactions with the plastic additive triphenyl phosphate, highlighting its substrate versatility. Molecular dynamics simulations confirmed the stability of enzyme-ligand complexes (RMSD < 0.35 nm) and provided insights into key binding residues. These results indicate that this acylamidase possesses structural determinants accommodating both PAHs and other organic micropollutants, providing a computational foundation for its application in enzymatic bioremediation.
Creep behavior of palm fiber reinforced epoxy composites: Experimental analysis and environmental implications
(Elsevier, 2026) Boukhlif, Amel; Zengah, Sahnoun; Baltach, Abdelghani; Baltach, Abdelghani; Djebli, Abdelkader; Bendouba, Mostefa; Uzun Yaylacı, Ecren; Yaylacı, Murat
This study investigates the combined effects of temperature and palm fiber reinforcement on the mechanical and creep behavior of epoxy-based composites. The viscoelastic response was evaluated from 20°C to 80°C, focusing on instantaneous strain, time-dependent deformation, and steady-state creep rate (min−1). The incorporation of palm fibers increased the ultimate tensile strength from approximately 20 MPa for neat epoxy to 37 MPa and 55 MPa for composites reinforced with one and two palm fiber layers, respectively. Young's modulus also increased from 3.15 GPa for neat epoxy to 3.41 GPa for the two-layer composite, indicating an improvement of about 8.3%. The results show a strong thermo-activated creep mechanism, where increasing temperature enhances molecular mobility, reduces polymer viscosity, and increases deformation in neat epoxy. In contrast, palm fiber reinforcement markedly improves the mechanical stability and creep resistance of the epoxy matrix. Under a nominal dead-weight load of 1000 g (9.81 N), the maximum creep strain decreased from approximately 0.24 for neat epoxy to 0.205 and 0.165 for the one-layer and two-layer palm fiber composites, respectively. In addition, the two-layer composite reduced the maximum creep strain by approximately 37%, 34%, and 31% under applied loads of 400 g, 600 g, and 1000 g, respectively. These improvements are attributed to efficient stress transfer, restricted polymer-chain mobility, and the reinforcing effect of the fiber network. Overall, the results demonstrate that palm fiber reinforcement enhances both mechanical performance and long-term creep resistance, making these composites suitable for lightweight structural applications under moderate thermal environments.
Carbon foam based microporous Pd(0) catalyst: the rapid and efficient reduction of organic pollutants
(Springer, 2026) Özçifçi, Zehra; Baran, Nuray Yılmaz; Akçay, Hakkı Türker; Karaoğlu, Kaan; Baran, Talat
In the present work, we report the synthesis of a low-cost microporous sucrose-based carbon foam (ACF) with a specific surface area of 591.29 m2/g, which was used as support for the preparation of a palladium-based (ACF-Pd) heterogeneous catalyst. The prepared ACF-Pd heterogeneous catalyst was characterized using BET, Raman, XPS, XRD, TEM, SEM and EDS methods. The catalytic reduction/decolorization capacity of microporous ACF-Pd was investigated for the reduction of various nitroarenes (2-nitroaniline, 4-nitroaniline, 4-nitrophenol and 4-nitro-o-phenylenediamine) and organic dyes (methyl orange, methylene blue and rhodamine B) by UV-Vis spectroscopy in an aqueous medium, with NaBH4 as the reducing agent at room temperature. The advantages of this method include short reaction times, mild reaction conditions, high yields, easy separation and excellent chemical stability of the catalyst due to its reusability. The results of the catalytic tests showed that the reduction/discoloration reactions of both nitro compounds and organic dyes were successfully carried out within 0–100 s, owing to the strong catalytic ability of ACF-Pd. Moreover, the catalytic reduction of 2-nitroaniline was carried out five times in consecutive run without both noticeable decrease in the catalytic and any change in the morphology of the catalyst, confirming that it is a sustainable and robust nano catalyst.
Comparative genomic analysis of pseudomonas shahriarae reveals virulence potential, antimicrobial resistance, and environmental adaptation
(Springer, 2026) Kumru, Salih
Pseudomonas shahriarae is a recently identified member of the P. fluorescens group. Its ecological range and ability to cause disease are still mostly unknown, especially in aquaculture settings. This work presents the first genome sequence of P. shahriarae isolated from diseased Siberian sturgeon (Acipenser baerii). To obtain deeper understanding of its evolutionary history, pathogenicity, and capacity of antibiotic resistance, this genome was compared with seven other publicly available genomes. The draft genome of strain SK21 was 6.12 Mb size and had a GC content of 60.5%. Core genome analysis revealed 3,652 conserved genes among strains, and average nucleotide identity values over 98% validated species-level relatedness among the majority of isolates. One strain that was originally thought to be P. shahriarae exhibited only about 83% ANI and grouped with Pseudomonas iridis, which suggests that it was misclassified. A comparative genomic investigation showed that there is a shared set of virulence-associated factors, such as genes that help with adhesion, biofilm formation, motility, immunological regulation, and nutrition acquisition, as well as different secretion systems (T1SS–T6SS). The strain from sturgeon uniquely expressed a full class 1 integron, indicating the acquisition of antimicrobial resistance components by horizontal gene transfer in aquaculture settings. The extensive prophage regions and metabolic flexibility further underscore the adaptability of this species. This work presents the first genomic evidence associating P. shahriarae with sturgeon disease and uncovers a genetically varied bacteria that may impact aquaculture health and the spread of antibiotic resistance.
Delayed ultrasound in ectopic pregnancy: clinical selection, time-dependent diagnosis, and the limits of reassurance
(Springer Nature, 2026) Çelik, Ali
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