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    Green synthesis of ZnO nanoparticles using Laurus nobilis L. extract and investigation of corrosion inhibition properties of DES-based nanofluids
    (Springer, 2024) Dalmaz, Aslihan; Kasimfirtina, Eren; Ozak, Sezen Sivrikaya
    In this study, new nanofluids based on four different deep eutectic solvents consisting of acetic acid and ethylene glycol as hydrogen bond acceptors, choline chloride, and water as hydrogen bond donor were prepared and these deep eutectic solvents, ZnO used to influence the corrosion of nanoparticles. The study's originality is that for the first time in this study, ZnO nanoparticles obtained with the help of the green material deep eutectic solvent and the extract of Laurus nobilis L. leaves were used effectively in the corrosion study. As a result of the corrosion studies, the best corrosion prevention efficiency was determined in the nanofluid prepared by adding 0.015% by weight ZnO nanoparticles. According to the XRD analysis results, the synthesized ZnO nanoparticles are formed in a hexagonal structure. When the SEM images of ZnO nanoparticles were examined, it was seen that the obtained structure was homogeneous, and the dimensions of the nanoparticles varied between 12 and 33 nm. The thermal stability of ZnO nanoparticles was proven from the TGA curve, where only a 2% weight loss was observed. ZnO nanoparticles did not undergo any degradation up to 1000(degrees)C.
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    A potential new approach for preserving historical artifacts through gamma irradiation and green antimicrobials: Microbiological and theoretical screening
    (Pergamon-Elsevier Science Ltd, 2026) Ergun, Ece; Halkman, Hilal B. D.; Kasimfirtina, Eren; Kantoglu, Omer; Ergun, Umit; Orhan, Ersin
    This study presents a novel combined treatment process for the decontamination of historical textiles, using gamma irradiation with green antimicrobial agents. Microbiological studies and theoretical approaches were utilized to investigate the effect of treatment processes individually and in combination on isolates from the textile museum. The mean D-10 values and the required doses for complete inactivation were found to be 1.19 and 7.60 kGy for bacteria cocktail and 1.47 and 6.32 kGy for mold cocktail, respectively. The antimicrobial activities of two Schiff bases and their reduced derivatives were tested against gamma-resistant microorganisms by measuring the diameter of the inhibition zones. It was found that reduced derivatives exhibited higher antibacterial activity. All compounds were screened through an in-silico study to evaluate the physicochemical properties, drug-likeness, and toxicity profile. Molecular docking studies were performed to investigate the binding affinity of the title compounds against E. coli DNA gyrase B and topoisomerase IV. From the perspectives of both in vitro studies and computational analysis, L4 exhibited the highest biological activity. This finding revealed that the reduction of the imine bond and molecular flexibility have a significant influence on binding to the active site of the biomolecule. Finally, the combined treatment utilizing L4 with gamma irradiation demonstrated a synergistic effect, leading to a 2.6-fold reduction compared to the control, whereas the individual treatments of L4 and gamma irradiation exhibited approximately a 1-fold reduction. This synergistic effect presents an innovative approach to the historical artifact preservation, providing a more efficient and potentially safer decontamination strategy.