检索结果-南通市图书馆

Characterization of NDM-5-producing Enterobacteriaceae isolates from retail grass carp(Ctenopharyngodon idella) and evidence of blaNDM-5-bearing IncHI2 plasmid transfer between ducks and fish

引用

Zoological Research 2022年第2期43卷 255-264页

作者： Lu-Chao Lv Yao-Yao Lu Xun Gao Wan-Yun he ming-Yi Gao Kai-Bin mo Jian-Hua Liu College of Veterinary Medicine Key Laboratory of Zoonosis of Ministry of Agricultural and Rural AffairsNational Risk Assessment Laboratory for Antimicrobial Resistant of Microorganisms in AnimalsGuangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety EvaluationSouth China Agricultural UniversityGuangzhouGuangdong 510642China Guangdong Laboratory for Lingnan modern Agriculture GuangzhouGuangdong 510642China

We aimed to characterize NDM-5-producing Enterobacteriaceae from aquatic products in Guangzhou,China.A total of 196 intestinal samples of grass carp collected in 2019 were screened for carbapenemase genes.Characterization of bla_(NDM-5) positive isolates and plasmids was determined by antimicrobial susceptibility testing,conjugation experiments,Illumina HiSeq,and Nanopore sequencing.One Citrobacter freundii and six Escherichia coli strains recovered from seven intestinal samples were verified as bla_(NDM-5) carriers(3.57%,7/196).The bla_(NDM-5) genes were located on the lncX3(n=5),lncHI2(n=1),or lncHI2-lncF(n=1)plasmids.All bla_(NDM-5)-bearing plasmids were transferred by conjugation at frequencies of~10^(-4)-10^(-6).Based on sequence analysis,the lncHI2 plasmid pHNBYF33-1 was similar to other bla_(NDM-5)-carrying lncHI2 plasmids deposited in GenBank from Guangdong ducks.In all lncHI2 plasmids,bla_(NDM-5)was embedded in a novel transposon,Tn7057(IS3000-△ISAba125-IS5-△ISAba125-bla_(NDM-5)-bleMBL-trpF-tat-△dct-IS26-△umuD-△ISKox3-IS3000),which was identical to the genetic structure surrounding bla_(NDM-5)found in some IncX3 plasmids.The lncHI2-lncF hybrid plasmid pHNTH9F11-1 was formed by homologous recombination of the bla_(NDM-5)-carrying lncHI2 plasmid and a heavy-metal-resistant IncF plasmid through△Tn1721 To the best of our knowledge,this is the first report on the characterization of bla_(NDM-5)-bearing plasmids in fish in China.The lncHI2 plasmid pHNBYF33-1 may be transmitted from ducks,considering the common duck-fish freshwater aquaculture system in Guangdong.Tn7051 is likely responsible for the transfer of bla_(NDM-5) from lncX3 to lncHI2 plasmids in Enterobacteriaceae,resulting in the expansion of transmission vectors of bla_(NDM-5).

关键词： bla_(NDM-5) Enterobacteriaceae Plasmid Fish Carbapenemase

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Electrochemically-mediated C-H functionalization of allenes and 1,3-dicarbonyl compounds to construct tetrasubstituted furans

引用

Organic Chemistry Frontiers 2022年第3期9卷 781-787页

作者： Mu-Xue he Yan Yao Chun-Zhi Ai Zu-Yu mo Yu-Zheng Wu Qi Zhou Ying-ming Pan Hao-Tao Tang State Key Laboratory for Chemistry and molecular Engineering of Medicinal Resources School of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004China School of Public health Guilin Medical UniversityGuilin 541004China Pharmacy School Guilin Medical UniversityGuilin 541004China Adesis Inc.A Universal Display company New CastleDelaware 19720USA

C-H functionalization of allenes is an available strategy to construct heterocyclic compounds.herein we propose a sus-tainable electrocatalytic C-H activation for the synthesis of novel highly functionalized tetrasubs... 详细信息

关键词： compounds substituted furan

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于随机建模的个人养老金账户内涵收益率研究

引用

保险研究 2023年第7期 67-77页

作者：莫一茗何林中国人民大学财政金融学院

人口老龄化对现收现付制养老金系统的可持续性造成巨大冲击,大力发展第三支柱个人养老金是完善养老保险制度的重要途径。如何提高个人养老金参与率以缓解基本养老保险压力是重要的研究课题。本文根据个人养老金管理实践,采用连续时间随... 详细信息

人口老龄化对现收现付制养老金系统的可持续性造成巨大冲击,大力发展第三支柱个人养老金是完善养老保险制度的重要途径。如何提高个人养老金参与率以缓解基本养老保险压力是重要的研究课题。本文根据个人养老金管理实践,采用连续时间随机模型,对个人养老金账户的投资积累过程进行建模,并加入主观折现因子刻画参与人对流动性限制和风险承担要求的补偿。令个人养老金账户期望积累值与个人投资积累值相等,建立了参与个人养老金计划的决策指标内涵收益率。研究结果表明:不同收入人群的内涵收益率存在较大差异;提高个人养老金账户的投资收益率以及降低主观折现因子可以提高内涵收益率;可以通过设置差异税率、提高投资收益率、以及提供流动性机会等机制设计吸引不同人群参与个人养老金计划。此外,存在保底收益率的产品在兜底的同时保留了获得上行收益的可能性,对收益分布存在非对称影响。此类产品增强了养老金的积累效果,有助于实现个人养老金的扩面。

关键词：个人养老金随机建模内涵收益率保底收益率 monte Carlo方法

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

An online error calibration method for spaceflight TT&C systems based on LEO-ground DDGPS

引用

Frontiers of Information Technology & Electronic Engineering 2019年第6期20卷 829-841页

作者： Qiao WANG Xiao-jun JIN Wei ZHANG Shi-ming mo Zhao-bin XU Zhong-he JIN Micro-Satellite Research Center Zhejiang University Hangzhou 310027 China

To overcome the shortcomings of the traditional measurement error calibration methods for spaceflight telemetry, tracking and command(TT&C) systems, an online error calibration method based on low Earth orbit satellite-to-ground doubledifferential GPS(LEO-ground DDGPS) is proposed in this study. A fixed-interval smoother combined with a pair of forward and backward adaptive robust Kalman filters(ARKFs) is adopted to solve the LEO-ground baseline, and the ant colony optimization(ACO) algorithm is used to deal with the ambiguity resolution problem. The precise baseline solution of DDGPS is then used as a comparative reference to calibrate the systematic errors in the TT&C measurements, in which the parameters of the range error model are solved by a batch least squares algorithm. To validate the performance of the new online error calibration method, a hardware-in-the-loop simulation platform is constructed with independently developed spaceborne dual-frequency GPS receivers and a Spirent GPS signal generator. The simulation results show that with the fixed-interval smoother, a baseline estimation accuracy(RMS, single axis) of better than 10 cm is achieved. Using this DDGPS solution as the reference, the systematic error of the TT&C ranging system is effectively calibrated, and the residual systematic error is less than 5 cm.

关键词： Spaceflight low Earth orbit (LEO) Filter Optimization Calibration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

养老金奖惩机制对退休决策的影响研究——基于累积前景理论的视角

引用

保险研究 2022年第10期 112-127页

作者：莫一茗何林中国人民大学财政金融学院

随着人口老龄化问题的日益严峻,延迟退休势在必行。如何通过机制设计有效引导参保人自愿选择延迟退休是重要的研究课题。本文参考国际上弹性退休政策和养老金奖惩机制的实践经验,旨在设计一种符合我国人口变化规律和经济发展状况的养老... 详细信息

随着人口老龄化问题的日益严峻,延迟退休势在必行。如何通过机制设计有效引导参保人自愿选择延迟退休是重要的研究课题。本文参考国际上弹性退休政策和养老金奖惩机制的实践经验,旨在设计一种符合我国人口变化规律和经济发展状况的养老金领取待遇奖惩机制。在此机制下,通过比较养老金财富的精算净现值作为退休决策的依据。同时,考虑到参保人的不完全理性,引入累积前景理论刻画其对领取低于缴费的厌恶,以及对早亡概率的扭曲认知。研究结果表明:即使考虑到参保人的不完全理性行为,奖惩机制依然可以有效激励参保人选择延迟退休。此外,部分奖惩参数存在门槛效应,需要谨慎设计奖惩机制的微观方案,以起到有效的激励效果。

关键词：延迟退休养老金财富累积前景理论奖惩机制退休决策

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Phosphate Solubilizing Ability and Phylogenetic Diversity of Bacteria from P-Rich Soils Around Dianchi Lake Drainage Area of China

引用

Pedosphere 2012年第5期22卷 707-716页

作者： YANG Pei-Xiang MA Li CheN ming-Hui XI Jia-Qin he Feng DUAN Chang-Qun MO Ming-He FANG Dun-Huang DUAN Yan-Qing YANG Fa-Xiang Laboratory for Conservation and Utilization of Bio-Resources&Ministry of Education Key Laboratory for Microbial Resources Yunnan UniversityKunming 650091(China) Zhengzhou Tobacco Research Institute of China National Tobacco Corporation Zhengzhou 450001(China) Yunnan Academy of Tobacco Agricultural Science Yuxi 653100(China) Technology Department of Hongyunhonghe Group Kunming 650202(China) Yunnan Yunye Fertilizer Co. Ltd.Kunming 650217(China)

The phylogenetic diversity of phosphate solubilizing bacteria (PSB) distributed in P-rich soils in the Dianchi Lake drainage area of China was characterized, and the tricalcium phosphate (TCP) solubilizing activities of isolated PSB were determined. Among 1328 bacteria isolated from 100 P-rich soil samples, 377 isolates (28.39% of the total) that exhibited TCP solubilization activity were taken as PSB. These PSB showed different abilities to solubilize TCP, with the concentrations of solubilized P in bacterial cultures varying from 33.48 to 69.63 mg L-1. A total of 123 PSB isolates, with relatively high TCP solubilization activity (> 54.00 mg L-1), were submitted for restriction fragment length polymorphism (RFLP) analysis, which revealed 32 unique RFLP patterns. Based on these patterns, 62 representative isolates, one to three from each RFLP pattern, were selected for 16S rRNA sequencing. Phylogenetic analysis placed the 123 PSB into three bacterial phyla, namely Proteobacteria, Actinobacteria and Firmicutes. Members of Proteobacteria were the dominant PSB, where 107 isolates represented by 26 RFLP patterns were associated with the genera of Burkholderia, Pseudomonas, Acinetobacter, Enterobacter, Pantoea, Serratia, Klebsiella, Leclercia, Raoultella and Cedecea. Firmicutes were the subdominant group, in which 13 isolates were affliated with the genera of Bacillus and Brevibacterium. The remaining 3 isolates were identified as three species of the genus Arthrobacter. This research extends the knowledge on PSB in P-rich soils and broadens the spectrum of PSB for the development of environmentally friendly biophosphate fertilizers.

关键词：系统发育多样性解磷细菌解磷能力滇池流域土壤限制性片段长度多态性 RFLP图谱伯克霍尔德氏菌

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Leakage current characteristics of SrTiO_(3)/LaNiO_(3)/Ba_(0.67)Sr_(0.33)TiO_(3)/SrTiO_(3 )heterostructure thin films

引用

Rare Metals 2021年第4期40卷 961-967页

作者： Yi Zhang Xiao-Yang Chen Bin Xie Zhi Wang ming-Jian Ding Qiao he Hang Ji Tao-Lan mo Ping Yu College of Material Science and Engineering Sichuan UniversityChengdu 610064China Aurora Technologies Co. LtdGuangzhou 510288China

There is an urgent demand to explore new approaches of improving the electric breakdown strength of the ferroelectric thin-film capacitor without the degradation of the high dielectric constant.In this work,LaNiO_(3)/Ba_(0.67)Sr_(0.33)TiO_(3)(LNO/BST) thin film and SrTiO_(3)(STO)/LNO/BST/SrTiO_(3)(STO) were prepared by using radio frequency(RF) magnetron sputtering technique and ultrathin STO insulator layers were inserted between the LNO/BST and metal electrodes(Au or Pt) to improve the electric breakdown strength and the leakage current of the LNO/BST thin film.X-ray diffraction(XRD) and scanning electron microscopy(SEM) investigations revealed that these multilayer thin films show compact,smooth and uniform morphologies.The leakage current density of STO/LNO/BST/STO thin film was decreased by one order of magnitude and breakdown strength of STO/LNO/BST/STO thin film was enhanced from 0.72 to 1.26 MV-cm-1compared with that of LNO/BST thin film.moreover,the dielectric constant of the STO/LNO/BST/STO thin film keeps at the same level as that of LNO/BST thin film,and dielectric loss of the STO/LNO/BST/STO thin film was decreased slightly compared with that of LNO/BST thin film.

关键词： LNO/BST Interface engineering Breakdown strength Barrier layer SrTiO_(3)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

核-壳和中空多面体二氧化钛制备、表征及光催化

引用

无机化学学报 2013年第7期29卷 1419-1427页

作者：何明明莫茂松北京有色金属研究总院先进电子材料研究所北京100088

本文采用水热法控制制备了具有特殊纳米结构的核-壳和中空多面体二氧化钛,以进一步提高具有特定暴露面多面体二氧化钛的比表面积,达到更优异的光催化效果。用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)等技术对所制备特殊结构二氧... 详细信息

本文采用水热法控制制备了具有特殊纳米结构的核-壳和中空多面体二氧化钛,以进一步提高具有特定暴露面多面体二氧化钛的比表面积,达到更优异的光催化效果。用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)等技术对所制备特殊结构二氧化钛的物相和微/纳结构进行表征分析,结果表明所得核-壳和中空结构多面体二氧化钛具有一个类似隧道结构的(001)/(001)洞开的截顶双金字塔型壳层。这两种特殊结构的形成可能是源于配位/弱酸性腐蚀原理的共同作用。用核-壳和中空结构二氧化钛对亚甲基蓝进行光降解实验,结果表明:两种新颖结构二氧化钛具有优异的光催化性能,尤其是在添加过氧化氢条件下。可能原因是:两种特殊结构二氧化钛大比表面积正面作用抵消了(001)晶面消失或减少所产生的副作用,以及过氧化氢在光催化反应中提供的活性氢氧根自由基使得光辐照二氧化钛产生的电子-空穴对在催化剂表面得到有效分离。

关键词：多面体核-壳结构中空结构二氧化钛光催化水热合成

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Phenomic and metabolomic responses of roots to cadmium reveal contrasting resistance strategies in two rice cultivars(Oryza sativa L.)

引用

Soil Ecology Letters 2021年第3期3卷 220-229页

作者： Chong Liu mo-ming Lan Er-kai he Ai-jun Yao Guo-bao Wang Ye-tao Tang Rong-liang Qiu School of Environmental Science and Engineering Guangdong Provincial Key Laboratory for Environmental Pollution Control and Remediation TechnologySun Yat-sen UniversityGuangzhou 510006China Guangdong Provincial Engineering Research Center for heavy Metal Contaminated Soil Remediation Sun Yat-sen UniversityGuangzhou 510006China School of Geography and Planning Sun Yat-sen UniversityGuangzhou 510275China Guangdong Laboratory for Lingnan modern Agriculture College of Natural Resources and EnvironmentSouth China Agricultural UniversityGuangzhou 510642China

To cope with heavy metal stress,plant root systems undergo root structure modification and release of multifarious metabolites.Elucidation of the resistance strategies to heavy metals mediated by the root system is crucial to comprehend the resistance mechanisms of plants.here two rice cultivars with contrasting grain cadmium(Cd)accumulation traits were selected and the responses of their root systems to Cd stress were evaluated by morphological and metabolomics analysis.The phenomic and metabolomic responses of the root system varied between the two cultivars under Cd stress.The low-Cd accumulation rice cultivar(TY816)had a more highly developed root system that coped with Cd stress(10μM)by maintaining high root activity,while the root cells of the high-Cd accumulation cultivar(JY841)lost viability due to excessive Cd accumulation.TY816 upregulated lipids and fatty acids to reduce Cd uptake,whereas JY841 upregulated phenylethanoid glycosides to cope with Cd-induced oxidative stress.The combination of metabolomics and phenomics revealed that rice roots employ multiple strategies to increase their tolerance of Cd-induced oxidative stress.Differing capacities to shape the root system architecture and reprogram root exudate metabolites may contribute to the contrasting Cd accumulation abilities between JY841 and TY816.

关键词： Root morphology Exudates Cadmium Rhizosphere Metabolite

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Development of Improved Version of Quality of Life Assessment Instrument for Lung Cancer Patients Based on Traditional Chinese Medicine(QLASTCM-Lu)

引用

Chinese Journal of Integrative Medicine 2019年第11期25卷 831-836页

作者： WANG Ting-ting he Li-yun ZHANG ming WANG Shao-mo ZHAO Ai-guang CHU Lei ZHANG Li-yuan YOU Sheng-fu YOU Jie Department of Traditional Chinese Medicine Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghai (200011)China Institute of Basic Research in Clinical Medicine China Academy of Chinese Medical SciencesBeijing (100142)China Shanghai Chest Hospital Shanghai Jiaotong UniversityShanghai (200030)China Longhua Hospital Shanghai University of Traditional Chinese MedicineShanghai (200032)China Department of Integrated Traditional and Western Medicine Tumor Hospital of QingdaoQingdaoShandong Province (266042)China Putuo Hospital Affiliated to Shanghai University of Traditional Chinese Medicine Shanghai (200062)China

Objective: To develop an improved version of the Quality-of-Life Assessment instrument for Lung Cancer Patients Based on Traditional Chinese Medicine (QLASTCM-Lu) and to evaluate its psychometric property. Methods: The structured group method and the theory in developing rating scale were employed to revise the preliminary scale. The psychometric property (reliability, validity, and responsiveness) of the established QLASTCM-Lu (modified) were evaluated by quality of life data measured in 100 lung cancer patients. Statistical analyses were made accordingly by way of correlation analysis, factor analysis and paired t-test. Results: The internal consistency reliability of the overall scale and all domains was from 0.80 to 0.94. Correlation and factor analyses demonstrated that the scale was good in construct validity. The criterion validity was formed with European Organization for Research and Treatment of Cancer-Quality of Life Questionnaire- Lung Cancer (EORTC QLQ-LC43) as the criterion. Statistically significant changes were found apart from such domain as "mental condition" and "social function", with the standardized response means being close to those of QLQ-LC43. Conclusion: QLASTCM-Lu (modified) could be used to measure the quality of life of lung cancer patients with good reliability, validity and a certain degree of responsiveness.

关键词： lung cancer quality of life Chinese medicine scale European Organization for Research and Treatment of Cancer

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：