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Preparation and characterization of nitrogen-doped titanium dioxides

science china Chemistry 2007年第2期50卷 212-216页

作者： zhu guoping1 & zhou kanggen2 1 environmental science research & design institute of zhejiang province,hangzhou 310007,china 2 Department of environmental Engineering,School of Metallurgical science and Engineering,Central South University,Changsha 410083,china 1. environmental science research & design institute of zhejiang province Hangzhou 310007 China 2. Department of environmental Engineering School of Metallurgical Science and Engineering Central South University Changsha 410083 China

A type of high visible-light active titanium oxinitride(TiO2-xNx) powder was prepared by a simple proc-ess:the calcination of the hydrated titanium dioxide at the atmosphere of ammonia-argon using a tu-bular electric furnace at high temperatures. The hydrated titanium dioxide was synthesized as the precursor of TiO2-xNx using titanic acid as raw material,which came from sulfate technique of produc-ing titanium white. The effects of temperature and reaction time on the nitrogen content,grain size and crystal structure were studied. The visible-light activity and photocatalysis capability of the powder were also investigated.

关键词： nitrogen-doped titanium dioxides visible-light activity photocatalysis titanium oxinitride

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Genome degradation promotes Salmonella pathoadaptation by remodeling fimbriae-mediated proinflammatory response

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National science Review 2023年第10期10卷 32-43页

作者： Xiao zhou Xiamei Kang Jiaqi Chen Yan Song Chenghao Jia Lin Teng Yanting Tang Zhijie Jiang Xianqi Peng Xiaoxi Tao Yiwei Xu Linlin Huang Xuebin Xu Yaohui Xu Tengfei Zhang Shenye Yu Jiansen Gong Shaohui Wang Yuqing Liu Guoqiang zhu Corinna Kehrenberg Fran?ois-Xavier Weill Paul Barrow Yan Li guoping Zhao Min Yue institute of Preventive Veterinary sciences and Department of Veterinary Medicine Zhejiang University College of Animal Sciences Ningbo Academy of Agricultural sciences Hainan institute of zhejiang University Department of Microbiology Laboratory Shanghai Municipal Center for Disease Control and Prevention College of Veterinary Medicine Henan University of Animal Husbandry and Economy Key Laboratory of Prevention and Control Agents for Animal Bacteriosis Institute of Animal Husbandry and Veterinary Hubei Academy of Agricultural Sciences Division of Bacterial Diseases State Key Laboratory of Veterinary BiotechnologyHarbin Veterinary Research InstituteChinese Academy of Agricultural Sciences Poultry institute Chinese Academy of Agricultural Sciences Department of Animal Public Health Shanghai Veterinary Research Institute Chinese Academy of Agricultural Sciences Shandong Key Laboratory of Animal Disease Control and Breeding Institute of Animal Science and Veterinary MedicineShandong Academy of Agricultural Sciences College of Veterinary Medicine Yangzhou University institute for Veterinary Food science Faculty of Veterinary MedicineJustus-Liebig University Giessen Institut Pasteur Université Paris Cité Unité des bactéries pathogènes entériques School of Veterinary Medicine University of Surrey School of Life science Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences CAS Key Laboratory of Synthetic Biology Institute of Plant Physiology and EcologyShanghai Institutes for Biological SciencesChinese Academy of Sciences Department of Microbiology and Microbial Engineering School of Life SciencesFudan University State Key Laboratory for Diagnosis and Treatment of Infectious Diseases National Clinical Research Center for Infectious DiseasesNational Medical Center for Infectious DiseasesThe First Affiliated Hospital College of Medicine Zhejiang University zhejiang Provincial Key Laboratory of Preventive Veterinary Medicine

Understanding changes in pathogen behavior(*** virulence,a shift in transmission channel) is critical for the public health management of emerging infectious *** degradation via gene depletion or inactivation is recognized as a pathoadaptive feature of the pathogen evolving with the ***,little is known about the exact role of genome degradation in affecting pathogenic behavior,and the underlying molecular detail has yet to be *** large-scale global avian-restricted Salmonella genomes spanning more than a century,we projected the genetic diversity of Salmonella Pullorum(bvSP)by showing increasingly antimicrobial-resistant ST92 prevalent in Chinese *** phylogenomic analysis identified three lineages in bvSP,with an enhancement of virulence in the two recently emerged lineages(L2/L3),as evidenced in chicken and embryo infection ***,the ancestor L1 lineage resembles the Salmonella serovars with higher metabolic flexibilities and more robust environmental tolerance,indicating stepwise evolutionary trajectories towards avian-restricted ***-genome analysis pinpointed fimbrial degradation from a virulent *** later engineeredfim-deletion mutant,and all other five fimbrial systems,revealed behavior switching that restricted horizontal fecal-oral transmission but boosted virulence in *** depleting fimbrial appendages,bvSP established persistent replication with less proinflammation in chick macrophages and adopted vertical transovarial transmission,accompanied by ever-increasing intensification in the poultry ***,we uncovered a previously unseen paradigm for remodeling bacterial surface appendages that supplements virulence-enhanced evolution with increased vertical transmission.

关键词： Salmonella host adaptation pathogenic evolution virulence evolution vertical transmission fimbrial adhesin

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