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    Anoxybacillus flavithermus loaded y-Fe2O3 magnetic nanoparticles as an efficient magnetic sorbent for the preconcentrations of Cu(II) and Mn(II)
    (Pergamon-Elsevier Science Ltd, 2022) Ozdemir, Sadin; Turkan, Zeynep; Kilinc, Ersin; Altuner, Elif Esra; Sen, Fatih
    It was hypothesized that-iron( oxide nanoparticles (y-Fe2O3 NPs) functionalized with Anoxybacillus flavithermus (A. flavithermus) as an effective magnetic sorbent for the preconcentrations of toxic metal ions. It is clear to conclude that the main novelty of this study is that y-Fe2O3 NPs loaded with A. flavithermus is selective-specific for Cu(II), Mn(II). Structural functional groups of the samples were elucidated by FTIR, and SEM. Significant experimental parameters were investigated in detail. 0.2 mL min(-1) of flow rate, 5 mL of 1 M of hydrochloric acid as eluent, 150 mg biogenic mass sample, and 150 mg y-Fe2O3 NPs for supporting material were found as the best conditions. This developed method has been tested and verified using certified and standard reference materials. As a result of the studies, the pre-concentration factor of the Cu(II), Mn(II) metals was calculated as 40. All measurements showed that the developed solid-phase extraction (SPE) columns are available for 32 cycles. The use of y-Fe2O3 NPs equipped with A. flavithermus as an effective magnetic sorbent for the first measurements of ions was thoroughly studied. In order of the biosorption capacities were calculated as 26.0, and 30.3 mg/g for Cu (II), Mn(II), respectively. The developed method for specifying the samples showed excellent to excellent results.
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    Bioaccumulation, resistance, and remediation of Mn(II) and Cu(II) and their impacts on antioxidant enzymes of Anoxybacillus flavithermus
    (Institute for Ionics, 2023) Özdemir, Sadin; Turkan, Zeynep; Kılınç, Ersin; Altuner, Elif Esra; Şen, Fatih
    In this article, the effects of copper (Cu(II)) and manganese (Mn(II)) ions on the superoxide dismutase (SOD) and catalase enzymes (CAT) of the thermophilic Anoxybacillus flavithermus (A. flavithermus) were thoroughly examined. Results from experiments using the minimum inhibitory concentration (MIC) showed that A. flavithermus was less tolerant of ions in the liquid media than in the solid medium. In comparison to the control, the greatest percentage of bacterial growth was determined to be 20.4% including the addition of Mn(II) and 17.6% including the addition of Cu(II). Mn(II) bioaccumulation increases the total weight of the bacteria, while Cu(II) bioaccumulation specifically increases the weight of dry A. flavithermus (MDBW). The ability of A. flavithermus cell membrane to bioaccumulate ions was examined. At various ion concentrations, the CAT and SOD activities were examined. Any possible morphological alteration following the encounter with ions. The findings suggested that A. flavithermus may be used to extract and remove hazardous metals from industrial wastewaters. A. flavithermus is a potential bioindicator of hazardous metal-contaminated waters, according to antioxidative enzyme activity. Additionally, the activities of the antioxidant enzymes CAT and SOD increased with increasing ion concentrations up to 10.0 mg/L over a 48 h period. This indicates a protective response against oxidative stress caused by Cu(II) and Mn(II) ions.