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Particuology 2019年第3期17卷 63-70页

作者： xia han xiaolu Chen Mengfei Yan Honglai Liu Key Laboratory for Advanced Materials and School of Chemistry & Molecular Engineering East China University of Science and Technology Shanghai 200237 China

The versatile catechol unit of polydopamine (PDA) endows this molecule with a broad ranging adhesive properties and *** prepared free-standing PDA particles by a simple self-polymerization and these particles served as both an effective reductant and scaffold for a hybrid *** raspberrylike nanocomposites featured a high density of AuNPs uniformly deposited on PDA particles (PDA@Au).This system was prepared in-situ with assistance from the active catechol and amine groups of the PDA *** quantify the effect of the PDA carriers,we studied the catalytic activity of the PDA and PDA@Au *** PDA particles showed a pronounced charge-dependent catalytic activity for reduction of cationic methylene blue,negatively-charged 4-nitrophenolate,and zwitterionic rhodamine B in the presence of borohydride,whereas PDA@AuNPs showed catalytic activity with a less pronounced charge-dependence of the catalytic efficiency of the *** PDA particles served as a redox mediator and adsorbent accelerator in degradation of the dyes owing to its unique chemical structure.

关键词： Poiydopamine Gold nanoparticle Hybrid catalyst Adsorbent Redox mediator

TiB2 coating formed on nickel substrates by electroplating in molten salt of fluoride

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中国有色金属学会会刊：英文版 2004年第z1期14卷 132-135页

作者： LONG Jin-ming GUO Zhong-cheng han xia-yun Faculty of Materials and Metallurgical Engineering Kunrning University of Science and Technology Kunming 650093 China Faculty of Materials and Metallurgical Engineering Kunrning University of Science and Technology Kunming 650093 China Faculty of Materials and Metallurgical Engineering Kunrning University of Science and Technology Kunming 650093 China

The TiB2 coatings deposited over nickel substrate by electroplating was investigated, which is in molten salt of a fluoride mixture involving KF, NaF, K2 TiF6 and KBF4. Effects of temperature, cathodic current density (Jc) and duration on the coating's formation were examined. The composition, morphology and structure of the coatings were characterized by scanning electron microscopy (SEM), energy dispersive X-ray detector (EDS) and X-ray diffraction (XRD). The results show that the coatings, with black, smooth and uniform appearance, are composed of predominating TiB2 and small amounts of nickel titanium oxide (Ni0.75 Ti0.125 O). The coatings show a nodular morphology and the grain size is dependent on the Jc and ranges about 1 - 10 μm. There is a linear relationship between the coating's thickness and the time of electrolysis within certain duration range. The reduction of the potassium can take place simultaneously with the electrochemical synthesis of TiB2 as the Jc is in excess of certain level. The hardness of the TiB2 coatings is likely to be deteriorated due to the presence of potassium and Ni0.75Ti0.125 O in the coatings.

关键词： TiB2 coating electroplating molten salt nickel microstructure

Mosquito-Associated Viruses in China

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Virologica Sinica 2018年第1期33卷 5-20页

作者： han xia Yujuan Wang Evans Atoni Bo Zhang Zhiming Yuan Key Laboratory of Special Pathogens and Biosafety Wuhan Institute of Virology Chinese Academy of SciencesWuhan 430071 China University of Chinese Academy of Sciences Beijing 100049China

Mosquitoes are classified into approximately 3500 species and further grouped into 41 ***,they are considered to be among the most important disease vectors in the world and they can harbor a wide variety of *** mosquito viruses are considered to be of significant medical importance and can cause serious public health issues throughout the *** viruses are Japanese encephalitis virus(JEV),dengue virus(DENV),chikungunya virus(CHIKV),and Zika virus(ZIKV).Others are the newly recognized mosquito viruses such as Banna virus(BAV)and Yunnan orbivirus(YNOV)with unclear medical *** remaining mosquito viruses are those that naturally infect mosquitoes but do not appear to infect humans or other *** the continuous development and improvement of mosquito and mosquito-associated virus surveillance systems in China,many novel mosquito-associated viruses have been discovered in recent *** review aims to systematically outline the history,characteristics,distribution,and/or current epidemic status of mosquito-associated viruses in China.

关键词： Mosquito associated viruses China - Vector Public health

High-containment facilities and the role they play in global health security

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Journal of Biosafety and Biosecurity 2022年第1期4卷 1-4页

作者： han xia Zhiming Yuan Key Laboratory of Special Pathogens and Biosafety Wuhan Institute of VirologyChinese Academy of SciencesWuhanPeople’s Republic of China University of Chinese Academy of Sciences BeijingPeople’s Republic of China National Biosafety Laboratory(Wuhan) Chinese Academy of SciencesWuhanPeople’s Republic of China

Biological threats,whether naturally occurring or accidentally or deliberately released,have the potential to endanger lives and disrupt economies ***,high-containment protective measures should be implemented when handling bio-agents that can cause serious,highly contagious diseases,otherwise devastating pandemics can *** the fields of scientific investigation,healthcare,and product development,high-containment facilities play a critical role in preventing,detecting,and responding promptly and effectively to threats to global health *** this paper,we present a summary of the main types of high-containment facilities,as well as their applications,challenges,and suggestions for the future.

关键词： High-containment facility Global health security Biosafety Biological threat

Heavy Metal Contamination in Soil and Soybean near the Dabaoshan Mine, South China

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Pedosphere 2013年第3期23卷 298-304页

作者： ZHUANG Ping LI Zhi-An ZOU Bi xia han-Ping WANG Gang South China Botanical Garden Chinese Academy of Sciences

Concentrations of Pb, Cd, Cu, Zn, Cr and Ni in soybean (Glycine max L.) grown near the Dabaoshan Mine were investigated, and their potential risk to the health of inhabitants was estimated. In the Fandong (FD) and Zhongxin (ZX) villages, which are near the Dabaoshan mineral deposit, concentrations of Pb (0.34 mg kg^(-1) for FD), Cd (0.23 mg kg^(-1) for ZX) and Cr (1.14 and 1.75 mg kg^(-1) for FD and ZX, respectively) in the seeds of soybean exceeded the tolerance limit set by Chinese standards. The estimated daily intakes (EDIs) from consumption of soybean seeds for FD inhabitants were 0.570, 0.170, 38.550, 142.400, 1.910 and 14.530 μg d^(-1) kg^(-1) boby weight for Pb, Cd, Cu, Zn, Cr and Ni, respectively. Our results indicate that soybeans grown in the vicinity of the Dabaoshan Mine accumulate some metals, and the seeds pose a potential health risk to the local inhabitants.

关键词： accumulation cadmium estimated daily intake health risks target hazard quotient

Regulation of Eukaryotic Initiation Factor 4E and Its Isoform： Implications for Antiviral Strategy in Plants

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Journal of Integrative Plant Biology 2006年第10期48卷 1129-1139页

作者： Yu-Yang Zhang han-xia Li Bo Ouyang Zhi-Biao Ye National Key Laboratory of Crop Genetic Improvement Huazhong Agricultural University Wuhan 430070 China College of Horticulture and Forestry Huazhong Agricultural University Wuhan 430070 China

In recent years, biotechnology has permitted regulation of the expression of endogenous plant genes to improve agronomlcally important traits. Genetic modification of crops has benefited from emerging knowledge of new genes, especially genes that exhibit novel functions, one of which is eukaryotlc initiation factor 4E （eIF4E）. eIF4E Is one of the most important translation initiation factors Involved in eukaryotic initiation. Recent research has demonstrated that virus resistance mediated by eIF4E and Its isoform elf （Iso）4E occurs in several plant-virus interactions, thus indicating a potential new role for eIF4E/elF（Iso）4E In resistance strategies against plant viruses. In this review, we briefly describe eIF4E activity In plant translation, its potential role, and functions of the eIF4E subfamily In plant-virus interactions. Other initiation factors such as elF4G could also play a role In plant resistance against viruses. Finally, the potential for developing eIF4E-mediated resistance to plant viruses in the future Is discussed. Future research should focus on elucidation of the resistance mechanism and spectrum mediated by eIF4E. Knowledge of a particu- lar plant-virus interaction will help to deepen our understanding of eIF4E and other eukaryotic Initiation factors, and their involvement in virus disease control.

关键词： eIF4E antivirus eukaryotic initiation factors interaction plant

Comparative Metagenomic Profiling of Viromes Associated with Four Common Mosquito Species in China

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Virologica Sinica 2018年第1期33卷 59-66页

作者： han xia Yujuan Wang Chenyan Shi Evans Atoni Lu Zhao Zhiming Yuan Key Laboratory of Special Pathogens and Biosafety Wuhan Institute of Virology Chinese Academy of SciencesWuhan 430071 China University of Chinese Academy of Sciences Beijing 100049China Department of Microbiology and Immunology Laboratory of Viral Metagenomics Rega Institute for Medical Research Leuven KU Leuven - University of Leuven 3000 LouvainBelgium

Vast viruses are thought to be associated with *** sinensis,Armigeres subalbatus,Culex quinquefasciatus,and Culex tritaeniorhynchus are very common mosquito species in China,and whether the virome structure in each species is species-specific has not been *** this study,a total of 2222 mosquitoes were collected from the same geographic location,and RNAs were sequenced using the Illumina Miseq *** querying to the Refseq database,a total of 3,435,781,2,223,509,5,727,523,and 6,387,867 paired-end reads were classified under viral sequences from ***,***,***,and ***,respectively,with the highest prevalence of virus-associated reads being observed in *** metagenomic comparison analysis showed that the virus-related reads were distributed across 26 virus families,together with an unclassified group of ***,Circoviridae,Genomoviridae,Iridoviridae,Mesoniviridae,Microviridae,Myoviridae,Parvoviridae,Phenuiviridae,and Podoviridae were the top ten significantly different viral families among the four *** analysis reveals that the virome is species-specific in four mosquito samples,and several viral sequences which maybe belong to novel viruses are discovered for the first time in those *** investigation provides a basis for a comprehensive knowledge on the mosquito virome status in China.

关键词： Mosquito - Comparative metagenomics Virome China

WEAR AND SEALING CHARACTERISTICS OF ENGINE VALVE GUIDE

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Chinese Journal of Mechanical Engineering 2005年第3期18卷 434-438页

作者： Qu Shengguan xia Wei han Lifa xiao Zhiyu Chen Weiping LiYuanyuan College of Mechanical Engineering South China University of Technology Guangzhou 510640 China

A novel powder metallurgy （P/M） material with high wear resistance is developed in order to decrease the wear and lubricant-leakage of a diesel engine valve guide. The friction and wear tests of this material are conducted. It indicates that the wear resistance of the newly developed P/M material has been improved and much better than that of the formerly used alloy steel. Moreover, three different sealing structures are designed and theoretically analyzed with respect to the characteristic of hydrodynamic sealing. Through comparative experiments of component leakage and engine run-in for different valve guide structures, it proves that the structure with a machined sealing groove but not installed with a seal-ring cannot only reduce the specific lubricant consumption （SLC） of cylinder head, but also decrease the wear of valve stern and valve guide.

关键词： Engine valve guide Powder metallurgy material Friction and wear Sealing

Gamma radiation levels in the ambient environment of the QNPP Base

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Nuclear Science and Techniques 2007年第6期18卷 366-371页

作者： WENG Jianqing HE Jun xiaNG Yuanyi WANG Kan LI xia han Zhengdong Zhejiang Province Environmental Radiation Monitoring Center Hangzhou 310012 China

Monitoring results of gamma dose rate level in 1992～2004 in the ambient environment of the Qinshan Nuclear Power Plants(QNPP)Base,the northeast of Zhejiang Province,are reported in this *** is shown that the gamma dose rate of five monitoring sites of 2.5 km to QNPP Base is 84～113 nGy/h,with an average of 96 nGy/h in the 13 *** average value is close to the background level of 93 nGy/h prior to operation of the QNPP Base,and is lower than the monitoring result of 101 nGy/h at the reference site in hangzhou *** 50 km from the QNPP Base,the cumulative dose rate of the thermoluminescent dosimeter(TLD)is 90 nGy/h,which is lower than the back- ground level of 111 nGy/h.

关键词： α射线环境辐射监测系统辐射污染

Effect of fertilizer and water content on N_2O emission from three plantation soils in south China

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Journal of Environmental Sciences 2005年第6期17卷 970-976页

作者： LI Zhi-an ZOU Bi xia han-ping DING Yong-zhen TAN Wan-neng MA Zhen-rong South China Botanical Garden Chinese Academy of Sciences Guangzhou 510650 China

The effects of fertilizers and water content on N2O emission were studied using the three most typical plantation soils. Soil incubations were performed and fertilization and water content treatments were designed. At 25% of saturated water content（SWC）, N2O emissions from the soil treated with urea, KNO3, （NH4）2 SO, and KH2 PO, were compared at application rates of 0, 100, 200, 300 and 500 kg/hm2. At 80% of SWC, similar experiments were carried out but at only one application rate（500 kg/hm^2）. N2O emissions at various water contents（20%, 35%, 50%, 65%, 80% and 100% of SWC） were studied. At low water content（25% of SWC）, neither nitrogen nor phosphorus（or potassium） fertilizers led to a high level of N2O emission, which generally ranged from 2.03 to 29.02 μg/（m^2·h）. However, at high water content（80% SWC）, the fertilizers resulted in much greater N2O emission irregardless of soil tested. The highest N2O emission rates after 24 h of water addition were 1233 lag/（ m^2 ·h） for S. superba soil, 1507 lag/（m^2 · h） for P. elliottii soil and 1869 lag/ （m^2 h） for A. mangium soil respectively. N2O emission from soils treated with urea, （NH4）2SO, and KH2PO, immediately dropped to a low level but steadily increased to a very high level for the soil treated with KNO3. High NO3^- content was a basis of high level of N2O emission. N2O emission rates from soils peaked shortly after flooding, rapidly dropping to a very low level in soil from non-legume plantations, but lasting for a relatively long period in soil from legume plantations. When soil water content increased equaling to or higher than 65%, the accumulated N2O emission over a period of 13 d ranged from 20.21-29.78 mg/m^2 for S. superba, 30.57-70.12 mg/m^2 for P. elliottii and 300.89-430.51 mg/m^2 for A. mangium. The critical water content was 50% of SWC, above which a high level of N2O emission could be expected, and below which very little N2O emissions were detected. The results suggest that, at low water content（

关键词： N2O plantation south China Acacia mangium Pinus elliottii Schima superba