Search

Your search keyword '"Yuan, Nannan"' showing total 170 results
Start Over Author "Yuan, Nannan"
170 results on '"Yuan, Nannan"'

47. Recent Advances and Prospects of Metal‐Based Catalysts for Oxygen Reduction Reaction.

Author

Lang, Peng, Yuan, Nannan, Jiang, Qianqian, Zhang, Yichi, and Tang, Jianguo

Subjects
PRECIOUS metals, NITROGEN compounds, OXYGEN reduction, TRANSITION metal nitrides, TRANSITION metal oxides, METAL catalysts, TRANSITION metal carbides
Abstract

Fuel cells, as one of the most promising technologies in sustainable energy conversion systems, hold great expectations for commercial applications. Cathode oxygen reduction reaction (ORR) kinetics of fuel cells are very slow and require a large overpotential to make the reaction occur, which greatly limits the energy output of fuel cells. Therefore, designing and preparing a highly active and stable ORR catalyst has become a great challenge. Herein, recent advances in platinum‐based and platinum‐free materials in metal‐based catalysts are focused on, including structural properties, synthesis methods, performance characterization, and catalytic mechanisms. Although platinum‐based precious metal catalysts have excellent performance, high prices limit the scale of commercial fuel cells. Nonprecious metal catalysts (e.g., transition metal nitrogen‐doped carbon‐based catalysts (M‐N/C), transition metal compounds (transition metal oxides—TMOs, transition metal carbides—TMCs, transition metal nitrides/transition metal oxynitrides—TMNs/TMNOs), layered double hydroxides—LDHs) completely eliminate dependence on precious metals and exhibit excellent ORR catalytic activity and stability. Finally, the ideas for future design and preparation of new ORR catalysts and challenges in the future of research work are discussed. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

49. Function of the genetic element ‘Mona’ associated with fungicide resistance in Monilinia fructicola

Author

Chen, Shuning, Yuan, Nannan, Schnabel, Guido, and Luo, Chaoxi

Subjects
Gene Knockout Techniques, Transformation, Genetic, Ascomycota, Mycelium, Drug Resistance, Fungal, Gene Expression Regulation, Fungal, Genes, Fungal, DNA Transposable Elements, Original Articles, DNA Methylation, Spores, Fungal, Promoter Regions, Genetic, Fungicides, Industrial
Abstract

The genetic element ‘Mona’ has been shown previously to be associated with resistance to demethylation inhibitors (DMIs) in Monilinia fructicola. In this study, the promoter activity of the ‘Mona’ element was demonstrated genetically and the activity was narrowed down to a 20‐bp active region through a series of deletions. ‘Mona’ knockout transformants (ΔMona) were generated from DMI‐resistant isolate Bmpc7, and EC(50) values and expression of the MfCYP51 gene were found to be reduced in transformants compared with the parental isolate. When the ‘Mona’ element was inserted into the upstream region of the MfCYP51 gene of the DMI‐sensitive isolate HG3, the EC(50) values and expression of the MfCYP51 gene increased in the transformants compared with the parental sensitive isolate. These results indicate that the ‘Mona’ element determines the DMI fungicide resistance through the up‐regulation of the expression of the downstream MfCYP51 gene. No fitness penalty was observed in knockout and insertion transformants, i.e. transformants showed similar mycelial growth rate, sporulation and ability to cause lesions on fruit compared with their parental isolates, suggesting that the ‘Mona’ element does not affect basal life activities.

Published
2016

Catalog

Books, media, physical & digital resources
See catalog results