In the present work, a series of CaTiFeO (0 < < 0.5) materials are prepared using a modified Pechini method based on citric acid and a polyol as chelating agents. The synthesis conditions are optimized with respect to the specific surface area and phase purity by varying polyols (ethylene glycol, glycerol, and 1.6-hexanediol) and the ratio between citric acid, polyols, and cations. The impact of the polyols and the iron content (up to 40 mol % on the B site) is studied with respect to the oxygen exchange rate, reducibility using H-TPR, and catalytic performance for methane total oxidation. A correlation between the oxygen exchange rate studied using O exchange in powdered samples of CaTiFeO (0 < < 0.5) and ferric sites determined using Mössbauer spectroscopy and H-TPR is established. The oxygen activation and diffusion in CaTiFeO (0 < < 0.5) continuously increase in the studied range of Ti substitution. The methane oxidation performance does not increase above = 0.3, showing that methane oxidation is not limited by surface oxygen activation and CH is activated by specific iron sites in Fe-doped perovskites.
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http://dx.doi.org/10.1021/acs.inorgchem.2c01966 | DOI Listing |
J Orthop Surg Res
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Kunshan First People's Hospital Joint Surgery Department, 566 Qianjin East Road, Kunshan City, Suzhou, Jiangsu Province, 215399, China.
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January 2025
Department of Pharmacology and Toxicology, School of Pharmacy, Ardabil University of Medical Sciences, Ardabil, Iran.
Chronic/heavy exposure with ethanol is associated with risk of type 2 diabetes, due to β-cells dysfunction. It has been reported that ethanol can induce oxidative stress directly or indirectly by involvement of mitochondria. We aimed to explore the protective effects of the crocin/gallic acid/L-alliin as natural antioxidants separately on ethanol-induced mitochondrial damage.
View Article and Find Full Text PDFScand J Med Sci Sports
January 2025
Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark.
Physical activity (PA) reduces the risk of negative mental and physical health outcomes in older adults. Traditionally, PA intensity is classified using METs, with 1 MET equal to 3.5 mL O·min·kg.
View Article and Find Full Text PDFBioresour Bioprocess
January 2025
Qingdao Innovation Institute of East China University of Science and Technology, State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, People's Republic of China.
Cephalosporin C (CPC) is a critical raw material for cephalosporin antibiotics produced by Acremonium chrysogenum. During fermentation, the oxygen supply is a crucial factor limiting the efficient biosynthesis of CPC. This study demonstrated that the addition of exogenous surfactants significantly increased the dissolved oxygen (DO) level, extracellular catalase content, and final CPC titer.
View Article and Find Full Text PDFEMBO J
January 2025
Department of Oncology, The University of Oxford, Oxford, OX3 7DQ, UK.
Hypoxia is a common feature of solid tumors that has previously been linked to resistance to radiotherapy and chemotherapy, and more recently to immunotherapy. In particular, hypoxic tumors exclude T cells and inhibit their activity, suggesting that tumor cells acquire a mechanism to evade T-cell recognition and killing. Our analysis of hypoxic tumors indicates that hypoxia downregulates the expression of MHC class I and its bound peptides (i.
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