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Biogeography and diversity patterns of antibiotic resistome in the sediments of global lakes

Journal of Environmental Sciences 2023年第5期127卷 421-430页

作者： Chang Liu jinping chen Yuyi Yang Yanguo Teng Haiyang chen College of Water Sciences Beijing Normal UniversityBeijing 100875China Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical GardenChinese Academy of SciencesWuhan 430074China Engineering Research Center of Groundwater Pollution Control and Remediation Ministry of EducationBeijing 100875China

Lakes act as one of the reservoirs and dispersal routes of antibiotic resistance genes(ARGs)and pathogenic resistant bacteria in aquatic *** studies reported the occurrence and distribution of ARGs in lakes worldwide;however,few investigated the biogeography and diversity patterns of antibiotic resistome in the *** fill this gap,a large-scale data set of sediment metagenomes was collected from globally distributed lakes and characterized comprehensively using metagenomic assembly-based analysis,aiming to shed light on the biogeography and diversity patterns of ARGs in lake ecosystems from a global *** analyses showed that abundant and diverse ARGs were found in the global lake sediments,including a set of emerging ARGs such as mcr-type and carbapenem-resistant Enterobacteriaceae related *** of the identified ARGs were generally associated with the commonly used antibiotics,suggesting the role of increasing antibiotic consumptions on the resistome ***,the composition and diversity of ARGs varied across geographical distances and exhibited a scale-dependent distancedecay ***,the composition of ARGs was largely shaped by bacterial community structure,and their diversities were co-governed by stochastic process(∼48%)and deterministic process(∼52%).Findings provide a valuable insight to better understand ecological mechanisms of ARGs in lake ecosystems and have important implication for the prevention and control of resistome risk.

关键词： Antibiotic resistance genes Biogeography pattern Resistome diversity Ecological processes Metagenomic assembly-based analysis

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Design of the pulse duty cycle of the pseudolite signal in local area augmentation systems

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Science China(Physics,Mechanics & Astronomy) 2011年第6期54卷 1004-1008页

作者： LI ChunXia chen jinping CHU HengLin Beijing Global Information Application and Development Center Beijing 100094China

The short-pulse TDMA signal is an excellent solution to the near-far problem in the pseudolite augmentation systems,and the pulse duty cycle is an important element in the *** paper aims at designing the duty cycle of the pseudolite pulse signals with a theoretical *** first,the scope of the duty cycle is derived theoretically with the object of ensuring the reception of both the pseudolite signals and the satellite signals,and the expression for the theoretical upper limit is *** based on the proposed expression,the duty cycles of Galileo pseudolite pulse signals are *** theoretical upper limit can guide the design of the short-pulse TDMA pseudolite signals.

关键词： pseudolite short-pulse TDMA duty cycle

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Selection pressure drives the co-evolution of several lipid metabolism genes in mammals

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Chinese Science Bulletin 2012年第8期57卷 877-885页

作者： LIN BenFu YUAN LiHong chen jinping South China Institute of Endangered Animals Guangzhou 510260China Key Laboratory of Marine Bio-resources Sustainable Utilization(LMB) Key Laboratory of Applied Marine Biology of Guangdong Procince andChinese Academy of Sciences(LAMB)South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou510301China

Adipose tissue is an important endocrine organ and energy *** physiological effect on the regulation of the energy balance is considered an important factor underlying the evolution of *** test whether the genes controlling lipid metabolism have undergone adaptive molecular change in the evolution of mammals,in this study,we used the orthologous gene sequences of 12 important lipid metabolism proteins (leptin,OB-RL,RXRA,RXRB,RXRG,PPARA,PPARB/D,PPARG,PNLIP,ADIPOQ,LPL and UCP1) from NCBI's *** found evidence that 4 of the corresponding genes (leptin,ADIPOQ,PNLIP and PPARA) have undergone positive selection in their evolutionary history and that most adaptive changes occurred during the evolution of the super-clades Laurasiatheria (placentals) and suborders within Euarchontoglires (primates and rodents).Comparisons across sets of genes showed that in a third of cases,bursts of positive selection,more than would be expected by chance,occurred on corresponding *** propose that the positive selection drives adaptive changes in some lipid metabolism genes in or within Laurasiatheria and Euarchontoglires *** with evidence from earlier studies,our results show that co-evolution among interacting lipid metabolism proteins has taken place.

关键词：脂质代谢哺乳动物相关基因共同进化压力驱动代谢蛋白质适应性变化动物进化

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Research on Autonomous Orbit Determination of Navigation Satellite Based on Crosslink Range and Orientation Parameters Constraining

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Geo-Spatial Information Science 2006年第1期9卷 18-23页

作者： CAI Zhiwu ZHAO Dongming chen jinping JIAO Wenhai Center of Information Application and Development Around World P. O. Box 5136 Beijing 100094 China

Autonomous navigation of navigation satellite is discussed. The method of auto-orbit determination using the erosslink range and orientation parameters constraining is put forward. On the basis of the analysis of its ... 详细信息

关键词： satellite navigations autonomous navigations orbit determination

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An[Fe-Fe]-Hydrogenase Mimic Immobilized on MCM-41 for the Photochemical Production of Hydrogen in Pure Water

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Chinese Journal of Chemistry 2014年第6期32卷 479-484页

作者： Wen Wang Tianjun Yu Yi Zeng jinping chen Yi Li Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

A composite proton-reducing catalyst Hy@MCM-41 was created by using a hydrophobic[Fe-Fe]-hydrogenase mimic(Hy)incorporated into the K^(+)-exchanged molecular sieve *** acts as the active site to generate H_(2) by reducing H^(+),and MCM-41 provide a large surface area to maintain the dispersion of Hy and to prevent aggrega-tion and ***@MCM-41 was successfully applied to the light-induced hydrogen production in pure water with an iridium compound[Ir(ppy)_(2)bpy]Cl and triethylamine(TEA)as the photosensitizer and the sacrificial electron donor,respectively,exhibiting good stability and catalytic *** present study provides a general strategy for the application of water-insoluble catalysts in pure water by using mesoporous molecular sieves.

关键词： energy conversion hydrogen hydrogenase MCM-41 immobilization photochemistry

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Dendrimers-merging biomimics and photoenergy conversion

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Science China Chemistry 2015年第3期58卷 390-399页

作者： Xinyang Liu Yi Zeng Xiaohui Zhang Tianjun Yu jinping chen Yi Li Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences

Dendrimers are well-defined tree-like macromolecules possessing numerous chain ends emanating from a single core, which makes them attractive candidates for mimicking light-harvesting systems and hydrogenases. Photoinduced electron and energy transfers are main processes involved in light-harvesting and photocatalysis. In this review, the general concepts of design strategies and recent developments of photofunctional dendrimers in biomimics of light-harvesting systems and hydrogenases are discussed. The energy transfer and electron transfer processes in light-harvesting dendrimers and the effect of dendritic structures in photochemical hydrogen production are illustrated.

关键词： photofunctional dendrimers light-harvesting hydrogen production energy transfer electron transfer

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Spatiotemporal sectioning of two-photon fluorescence ellipsoid with a CsPbBr_(3) nanosheet

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Nano Research 2021年第11期14卷 4288-4293页

作者： Yizhi Zhu jinping chen Qiannan Cui Heng Guo Zhuxin Li Zengliang Shi Chunxiang Xu State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing210096China

Two-photon fluorescence (TPF) ellipsoid formed by a focused femtosecond laser into luminescent media serves as a fundamental pixel for TPF spatiotemporal imaging. Visualizing spatiotemporal evolution of the TPF ellipsoid itself in a selected luminescent medium is important for correctly reconstructing and interpreting spatiotemporal information of imaged targets. Here, we report a new spatiotemporal sectioning technique with a luminescent CsPbBr_(3) nanosheet and visualize the spatiotemporal evolution of TPF ellipsoid along the axial direction. Time-resolved axial lengths of TPF ellipsoids turn out to broaden nonlinearly with a turning point at about 600 ps. By comparison experiments, observed phenomena are attributed to photocarrier trapping and TPF photon recycling processes within CsPbBr_(3) nanosheets. The spatiotemporal sectioning technique is expected to be widely applicable, which will ignite a plethora of investigations and applications utilizing TPF ellipsoid.

关键词： spatiotemporal sectioning two-photon fluorescence ellipsoid CsPbBr_(3)nanosheet photocarrier trapping photon recycling

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Chemically Amplified Resist Based on Dendritic Molecular Glass for Electron Beam Lithography

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Chemical Research in Chinese Universities 2023年第1期39卷 139-143页

作者： HU Shengwen chen jinping YU Tianjun ZENG Yi YANG Guoqiang LI Yi Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190P.R.China Beijing National Laboratory for Molecular Sciences(BNLMS) Key Laboratory of PhotochemistryInstitute of ChemistryChinese Academy of SciencesBeijing100190P.R.China University of Chinese Academy of Sciences Beijing100049P.R.China

A novel dendritic molecular glass(MG)containing adamantane core(AD-15)was synthesized and *** exhibits good solubility in common organic solvents and a stable amorphous state at room temperature,which contributes to forming films with different thicknesses by *** thermal analysis of AD-15 indicates that no apparent glass transition temperature(Tg)is observed before the thermal decomposition temperature(Td=160℃).The good thermal resistance suggests that it can satisfy the lithographic process and is a candidate for photoresist *** patterning properties of AD-15 resist were evaluated by electron beam lithography(EBL).By optimizing the lithographic process parameters,AD-15 resist can achieve 40 nm half-pitch patterns with a line-edge roughness of 4.0 *** contrast and sensitivity of AD-15 resist were 1.9 and 67µC/cm^(2),*** with the commercial PMMA(950k)electron beam resist,the sensitivity of AD-15 resist increases by 6 *** study provides a new example of molecular glass resist with high resolution and sensitivity for EBL.

关键词： Dendritic molecule Molecular glass Chemically amplified resist Electron beam lithography

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Nonlinear phase error analysis of equivalent thickness in a white-light spectral interferometer

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Nanotechnology and Precision Engineering 2019年第2期2卷 77-82页

作者： Tong Guo Qianwen Weng Bei Luo jinping chen Xing Fu Xiaotang Hu State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University

A white light spectral interferometry based on a Linnik type system was established to accurately measure the thin film thickness through transparent *** practical work,the equivalent thickness of a beam splitter and the mismatch of the objective lens introduce nonlinear phase *** a transparent medium also increases the equivalent *** simulation results showthat the equivalent thickness has a significant effect on thin film thickness ***,it is necessary to perform wavelength correction to provide a constant equivalent thickness for *** the experiments,some pieces of cover glasses as the transparent medium were added to the measured beam and then a standard thin film thickness of 1052.2±0.9 nm was tested through the transparent *** results demonstrate that our system has a nanometer-level accuracy for thin film thickness measurement through transparent medium with optical path compensation.

关键词： White light spectral interferometry Thin film thickness measurement Nonlinear phase Equivalent thickness Transparent medium

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Advances in BeiDou Navigation Satellite System(BDS)and satellite navigation augmentation technologies

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Satellite Navigation 2020年第1期1卷 126-148页

作者： Rui Li Shuaiyong Zheng Ershen Wang jinping chen Shaojun Feng Dun Wang Liwen Dai School of Electronic and Information Engineering Beihang UniversityNo.37 Xueyuan RoadHaidian DistrictBeijingChina Suzhou Institute Beihang UniversitySuzhou 215200China College of Electronic and Information Engineering Shenyang Aerospace UniversityNo.37 Daoyi South StreetDaoyi DistrictShenyangChina Beijing Satellite Navigation Center No.22 Beiqing RoadHaidian DistrictBeijingChina Qianxun Spatial Intelligence Inc. C5 BuildingNo.1688-38 North Guoquan RoadYangpu DistrictShanghaiChina Space Star Technology Co. Ltd.Blue Lake Industry ParkHaidian DistrictBei-jingChina John Deere-Intelligent Solution Group 20780 Madrona AvenueTorranceCAUSA

Several noteworthy breakthroughs have been made with the BeiDou Navigation Satellite System(BDS)and other global navigation satellite systems as well as the associated augmentation systems,such as the commissioning of the BDS-3 preliminary system and the successful launch of the first BDS-3 GEO satellite which carries the satellite-based augmentation ***,BDS can provide basic services globally,and its augmentation system is also being *** paper gives an overview of BDS and satellite navigation augmentation *** overview is divided into four parts,which include the system segment technologies,satellite segment technologies,propagation segment technologies,and user segment *** each part,these technologies are described from the perspectives of preliminary information,research progress,and ***,the significance and progress of the BeiDou Satellite-based Augmentation System(BDSBAS),low earth orbit augmentation,and the national BeiDou ground-based augmentation system are presented,along with the airborne-based augmentation ***,the conclusions and discussions covering popular topics for research,frontiers in research and development,achievements,and suggestions are listed for future research.

关键词： BeiDou Navigation Satellite System Satellite navigation augmentation systems System segment technologies Satellite segment technologies Propagation segment technologies User segment technologies

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