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Long Lin,Zhiyan Feng,Zhongzhou Dong,Hualong Tao,Chencheng Hu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
For the detection of the more hazardous nitrogen oxides (NO2), there is a need to find a readily fabricated,low-cost, high-performance two-dimensional material. This paper selected three transition metal disulphides(TMDs), MoTe2, MoSe2 and MoS2, as materials for detecting NO2 molecules by density floodingtheory (DFT). The results show that the pure Mo(Te/Se/S)2 monolayer has a poor detection effect onNO2 molecules, and the modified monolayer exhibits better performance than its natural counterpartdue to the significant electron hybridization between the dopant and the gas molecules after the introductionof metal atoms on the surface. It also leads to significant changes in electronic properties andwork functions. The charge transfer mechanism based on Hirshfeld analysis shows that the charge transferfrom the modified substrate to the NO2 molecule improves the binding characteristics. And by discussingthe adsorption structure, adsorption energy, local electron density, density of states, andfrontier orbit theory, we show that MoTe2 is a promising material for gas detection and removal, whichwill provide experimentalists with theoretical guidance for the application of Mo(Te/Se/S)2 based sensingmaterials. Our work is important for predicting novel monosulfide sensing materials and extending theapplication of TMDs as chemical gas sensors in the field of environmental monitoring.
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Effects of Exocellobiohydrolase CBHA on Fermentation of Tobacco Leaves
Xu Xueqin,Wang Qianqian,Yang Longyan,Chen Zhiyan,Zhou Yun,Feng Hui,Zhang Peng,Wang Jie 한국미생물·생명공학회 2024 Journal of microbiology and biotechnology Vol.34 No.8
The quality of tobacco is directly affected by macromolecular content, fermentation is an effective method to improve biochemical properties. In this study, we utilized CBHA (cellobiohydrolase A) glycosylase, which was expressed by Pichia pastoris, as an additive for fermentation. The contents of main chemical components of tobacco leaves after fermentation were determined, and the changes of microbial community structure and abundance in tobacco leaves during fermentation were analyzed. The relationship between chemical composition and changes in microbial composition was investigated, and the function of bacteria and fungi in fermentation was predicted to identify possible metabolic pathways. After 48 h of CBHA fermentation, the contents of starch, cellulose and total nitrogen in tobacco leaf decreased by 17.60%, 28.91% and 16.05%, respectively. The microbial community structure changed significantly, with Aspergillus abundance decreasing significantly, while Filobasidum, Cladosporium, Bullera, Komagataella, etc., increased in CBHA treated group. Soluble sugar was most affected by microbial community in tobacco leaves, which was negatively correlated with starch, cellulose and total nitrogen. During the fermentation process, the relative abundance of metabolism-related functional genes increased, and the expressions of cellulase and endopeptidase also increased. The results showed that the changes of bacterial community and dominant microbial community on tobacco leaves affected the content of chemical components in tobacco leaves, and adding CBHA for fermentation had a positive effect on improving the quality of tobacco leaves.
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