检索结果-南通市图书馆

Unveiling the distinctive traits of functional rye centromeres:minisatellites,retrotransposons,and R-loop formation

Science China(Life Sciences) 2024年第9期67卷 1989-2002页

作者： chang Liu Shulan Fu Congyang Yi Yang Liu Yuhong Huang Xianrui Guo Kaibiao Zhang Qian Liu james A.Birchler Fangpu Han State Key Laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory for Plant Genetics and Breeding Sichuan Agricultural UniversityChengdu 611130China Division of Biological Science University of MissouriColumbia 65211-7400USA

Centromeres play a vital role in cellular division by facilitating kinetochore assembly and spindle *** their conserved functionality,centromeric DNA sequences exhibit rapid evolution,presenting diverse sizes and compositions across *** functional significance of rye centromeric DNA sequences,particularly in centromere identity,remains *** this study,we comprehensively characterized the sequence composition and organization of rye *** findings revealed that these centromeres are primarily composed of long terminal repeat retrotransposons(LTR-RTs)and interspersed *** systematically classified LTR-RTs into five categories,highlighting the prevalence of younger CRS1,CRS2,and CRS3 of CRSs(centromeric retrotransposons of Secale cereale)were primarily located in the core centromeres and exhibited a higher association with CENH3 *** minisatellites,mainly derived from retrotransposons,along with CRSs,played a pivotal role in establishing functional centromeres in ***,we observed the formation of R-loops at specific regions of CRS1,CRS2,and CRS3,with both rye pericentromeres and centromeres exhibiting enrichment in ***,these R-loops selectively formed at binding regions of the CENH3 nucleosome in rye centromeres,suggesting a potential role in mediating the precise loading of CENH3 to centromeres and contributing to centromere *** work provides insights into the DNA sequence composition,distribution,and potential function of R-loops in rye *** knowledge contributes valuable information to understanding the genetics and epigenetics of rye centromeres,offering implications for the development of synthetic centromeres in future plant modifications and beyond.

关键词： centromere LTR-RTs minisatellite rye R-loop

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

鹿舞林间自然之灵

引用

中国宝石 2023年第4期 32-35页

作者： james chang 东龙珠(图) 不详

《自然之灵》里的小鹿,如同森林的守护者,在月光的映照下,散发出神圣的光辉。这不仅是一件美丽的珠宝艺术品,更是创作者为向大自然致敬而奏响的一支生命赞曲。一、致敬自然,赞颂生命,《自然之灵》鹿形艺术珠宝倾注着创作者深邃的设计哲... 详细信息

《自然之灵》里的小鹿,如同森林的守护者,在月光的映照下,散发出神圣的光辉。这不仅是一件美丽的珠宝艺术品,更是创作者为向大自然致敬而奏响的一支生命赞曲。一、致敬自然,赞颂生命,《自然之灵》鹿形艺术珠宝倾注着创作者深邃的设计哲学。设计者将鹿设计成为作品的核心,在鹿形中融入自然元素,向人们倾诉与自然共舞的奥妙。

关键词：设计哲学守护者珠宝融入自然生命致敬

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

借鉴国外经验加快中国企业社会责任立法

引用

可持续发展经济导刊 2021年第9期 54-57页

作者： james chang 贾丽殷格非 WMA C0LLEGE 责扬天下(北京)管理顾问有限公司研发中心金蜜蜂智责扬天下(北京)管理顾问有限公司

加强企业社会责任立法,完善社会责任法律体系,能够促进公司发展目标与社会发展目标相结合,对我国经济社会高质量可持续发展具有重要价值。2014年,党的十八届四中全会明确提出“加强企业社会责任立法”。近年来,中国特色社会主义法律体... 详细信息

加强企业社会责任立法,完善社会责任法律体系,能够促进公司发展目标与社会发展目标相结合,对我国经济社会高质量可持续发展具有重要价值。2014年,党的十八届四中全会明确提出“加强企业社会责任立法”。近年来,中国特色社会主义法律体系不断完善,通过制定或修订法律进一步规范了企业应该履行的基本社会责任。例如,新修订的环境保护法贯彻中央推进生态文明建设的要求,体现了现代环境治理体系创新的新方向。民法总则为适应我国新时代对环境保护、生态平衡的时代需求,进一步增加了绿色原则,是企业进行民事活动需遵从的基本原则。虽然有关企业社会责任的立法在商法和经济法的各个部门法都有所体现,但促进企业、环境和社会协同可持续发展的理念和原则难以全面、平衡体现,存在一些法律规范不具体、缺乏从企业主体视角对利益相关方进行综合考虑的法律规范等。

关键词：中国特色社会主义法律体系党的十八届四中全会民法总则绿色原则民事活动环境保护法企业社会责任利益相关方

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

Recent Development and Applications of Ultra-high Performance Liquid Chromatography(UHPLC) and Micro Flow Liquid Chromatography(MFLC) Coupled with Q-Orbitrap for Analysis of Pesticides in Food

Recent Development and Applications of Ultra-high Performanc...

引用

BCEIA2013分析仪器应用技术报告会

作者： Jian Wang james chang Jon W.Wong Willis Chow Zhengwei Jia Paul Yang Canadian Food Inspection Agency Calgary Laboratory Thermo Fisher Scientific US Food and Drug Administration Center for Food Safety and Applied Nutrition Shanghai Institute for Food and Drug Control Ontario Ministry of the Environment

This paper presents an application of ultra-high performance liquid chromatography(UHPLC)and micro flow liquid chromatography(MFLC)coupled with electrospray ionization(ESI)quadrupole Orbitrap high resolution mass spec...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

利用Thermo Scientific全新高分辨台式、四极杆静电场轨道阱Q-Exactive分析19种β-受体激动剂

引用

中国食品 2011年第18期 62-65页

作者：叶芳挺王勇为 james S.chang 赛默飞世尔科技(中国)有限公司

β-受体激动剂．又称为β-兴奋剂，大家近期所熟知的瘦肉精一克伦特罗．莱克多巴胺等就是这一类兴奋剂。其是一类含氮激素中的苯乙胺类药物，苯乙胺类药物具有苯乙醇胺结构母核．苯环上连接有碱性的β-羟胺侧链。由于发现在饲料中添加β-

关键词：受体激动剂高分辨静电场四极杆 β-兴奋剂利用台式轨道

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

骨髓长期培养及其在自体骨髓移植中的应用

引用

国外医学（输血及血液学分册） 1991年第5期14卷 309-309页

作者： james chang 杨春瑛

由于目前还不清楚白血病细胞通常不能存活的原因,因此骨髓长期培养(LTBMC)能否作为白血病患者自体骨髓移植前骨髓净化的一种手段,是本文探讨的目的。一、白血病细胞在LTBMC中的生长特点 1985年Coulombel等首次报导AML患者骨髓细胞经LTBM... 详细信息

由于目前还不清楚白血病细胞通常不能存活的原因,因此骨髓长期培养(LTBMC)能否作为白血病患者自体骨髓移植前骨髓净化的一种手段,是本文探讨的目的。一、白血病细胞在LTBMC中的生长特点 1985年Coulombel等首次报导AML患者骨髓细胞经LTBMC后,白血病细胞明显减少,而使正常造血细胞占优势;另外,Ph′阳性的CML细胞经3～4周的LTBMC后可产生明显数量的ph′阴性细胞。本文作者的实验结果也证实了这一发现,他们培养AML患者骨髓细胞。

关键词：骨髓移植骨髓培养

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

Remote sensing of quality traits in cereal and arable production systems:A review

引用

The Crop Journal 2024年第1期12卷 45-57页

作者： Zhenhai Li Chengzhi Fan Yu Zhao Xiuliang Jin Raffaele Casa Wenjiang Huang Xiaoyu Song Gerald Blasch Guijun Yang james Taylor Zhenhong Li College of Geodesy and Geomatics Shandong University of Science and TechnologyQingdao 266590ShandongChina Key Laboratory of Quantitative Remote Sensing in Ministry of Agriculture and Rural Affairs Information Technology Research CenterBeijing Academy of Agriculture and Forestry SciencesBeijing 100097China Institute of Crop Sciences Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Physiology and EcologyMinistry of Agriculture and Rural AffairsBeijing 100081China DAFNE Universitàdella TusciaVia San Camillo de Lellis01100 ViterboItaly Key Laboratory of Digital Earth Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100094China International Maize and Wheat Improvement Center(CIMMYT) PO Box 5689Addis AbabaEthiopia ITAP Univ.MontpellierINRAEInstitut AgroMontpellier 34000France College of Geological Engineering and Geomatics Chang’an UniversityXi’an 710054ShaanxiChina

Cereal is an essential source of calories and protein for the global *** predicting cereal quality before harvest is highly desirable in order to optimise management for farmers,grading harvest and categorised storage for enterprises,future trading prices,and policy *** use of remote sensing data with extensive spatial coverage demonstrates some potential in predicting crop quality *** studies have also proposed models and methods for predicting such traits based on multiplatform remote sensing *** this paper,the key quality traits that are of interest to producers and consumers are *** literature related to grain quality prediction was analyzed in detail,and a review was conducted on remote sensing platforms,commonly used methods,potential gaps,and future trends in crop quality *** review recommends new research directions that go beyond the traditional methods and discusses grain quality retrieval and the associated challenges from the perspective of remote sensing data.

关键词： Remote sensing Quality traits Grain protein Cereal

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

Air-vent layouts and water-air flow behaviors of a wide spillway aerator

引用

Theoretical & Applied Mechanics Letters 2019年第2期9卷 130-143页

作者： james Yang Penghua Teng chang Lin Vattenfall R&D Hydraulic Laboratory Concrete Structures Royal Institute of Technology Resources Energy & Infrastructure Royal Institute of Technology Civil Engineering National Chung Hsing University

A spillway aerator should guarantee favorable flow conditions in the coupled water-air system even if the aerator is unconventionally wide. Eight air-vent configurations are devised and incorporated into a 35-m wide chute aerator for a generalized study. Computational fluid dynamics(CFD) simulations are performed to explore their effects on water-jet and air-cavity features. The Re-normalisation group(RNG) k-ε turbulence model and the two-fluid model are combined to predict the two-phase flow field. The results demonstrate appreciable influences of the vent layouts on the water-air flow. The air vents stir the air motion and re-distribute the cavity air pressure. Once the vent layout is modified, reciprocal adjustments exist between the jet behavior and air-pressure field in the cavity, thus leading to considerable differences in air-flow rate, jet-trajectory length, vent air-flow distribution across the chute, etc. The large width plays a discernable role in affecting the aerated flow. Telling differences exist between the near-wall region and the central part of the chute. To improve the duct pressure propagation, a gradual augment of the vent area should be assigned towards the chute center. Relative to single-slot vents across the flow, the layouts with segregated vents gain by comparison. A designer should see to it that a vented aerator operates satisfactorily for a given range of flow discharges.

关键词： Spillway Wide aerator Air entrainment Air-vent layout Jet trajectory CFD

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

Fast and accurate kernel density approximation using a divide-and-conquer approach

引用

Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第9期11卷 677-689页

作者： Yan-xia JIN Kai ZHANG james T. KWOK Han-chang ZHOU School of Electronics and Computer Science and Technology North University of China Taiyuan 030051 China Department of Computer Science and Engineering The Hong Kong University of Science and Technology Hong Kong China Key Laboratory of Instrumentation Science and Dynamic Measurement North University of China Taiyuan 030051 China

Density-based nonparametric clustering techniques,such as the mean shift algorithm,are well known for their flexibility and effectiveness in real-world vision-based *** underlying kernel density estimation process can be very expensive on large *** this paper,the divide-and-conquer method is proposed to reduce these computational *** dataset is first partitioned into a number of small,compact *** of the kernel estimator in each local cluster are then fit to a single,representative density *** key novelty presented here is the efficient derivation of the representative density function using concepts from function approximation,such that the expensive kernel density estimator can be easily summarized by a highly compact model with very few basis *** proposed method has a time complexity that is only linear in the sample size and data ***,the bandwidth of the resultant density model is adaptive to local data *** on color image filtering/segmentation show that,the proposed method is dramatically faster than both the standard mean shift and fast mean shift implementations based on kd-trees while

关键词： Nonparametric clustering Kernel density estimation Mean shift Image filtering

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

The ALMA-QUARKS Survey.Ⅱ.The ACA 1.3 mm Continuum Source Catalog and the Assembly of Dense Gas in Massive Star-Forming Clumps

引用

Research in Astronomy and Astrophysics 2024年第6期24卷 119-139页

作者：许峰玮 Ke Wang Tie Liu Lei Zhu Guido Garay Xunchuan Liu Paul Goldsmith Qizhou Zhang Patricio Sanhueza Shengli Qin Jinhua He Mika Juvela Anandmayee Tej Hongli Liu Shanghuo Li Kaho Morii Siju Zhang Jianwen Zhou Amelia Stutz Neal JEvans Kee-Tae Kim Shengyuan Liu Diego Mardones Guangxing Li Leonardo Bronfman Ken’ichi Tatematsu chang Won Lee Xing Lu Xiaofeng Mai Sihan Jiao james O.Chibueze Keyun Su Viktor L.Tóth Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China Department of Astronomy School of PhysicsPeking UniversityBeijing 100871China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Chinese Academy of Sciences South America Center for Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China Departamento de Astronomía Universidad de ChileLas Condes7591245 SantiagoChile Jet Propulsion Laboratory California Institute of Technology4800 Oak Grove DrivePasadena CA 91109USA Center for Astrophysics|Harvard&Smithsonian 60 Garden StreetCambridgeMA 02138USA National Astronomical Observatory of Japan National Institutes of Natural Sciences2-21-1 OsawaMitakaTokyo 181-8588Japan Astronomical Science Program The Graduate University for Advanced StudiesSOKENDAI2-21-1 OsawaMitakaTokyo 181-8588Japan School of Physics and Astronomy Yunnan UniversityKunming 650091China Yunnan Observatories Chinese Academy of SciencesKunming 650216China Department of Physics University of HelsinkiPO Box 64FI-00014 HelsinkiFinland Indian Institute of Space Science and Technology Thiruvananthapuram 695547KeralaIndia Max Planck Institute for Astronomy Königstuhl 17D-69117 HeidelbergGermany Department of Astronomy Graduate School of ScienceThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-0033Japan Max-Planck-Institut für Radioastronomie Auf dem Hügel 6953121 BonnGermany Departamento de AstronomÂıa Universidad de ConcepcionCasilla 160-CConcepci onChile Department of Astronomy The University of Texas at AustinTexas 78712-1205USA Korea Astronomy and Space Science Institute 776 Daedeokdae-roYuseong-guDaejeon 34055Republic of Korea Institute of Astronomy and Astrophysics Academia SinicaRoosevelt RoadTaipei 10617TaiwanChina South-Western Institute for Astronomy Research Yunnan UniversityKunming 650091China Korea Astronomy and Space Science Institute 776 Daedeok-daeroYuseong-guDaejeon 34055Republic of

Leveraging the high resolution,sensitivity,and wide frequency coverage of the Atacama Large Millimeter/submillimeter Array(ALMA),the QUARKS survey,standing for“Querying Underlying mechanisms of massive star formation with ALMA-Resolved gas Kinematics and Structures”,is observing 139 massive starforming clumps at ALMA Band 6(λ~1.3 mm).This paper introduces the Atacama Compact Array(ACA)7 m data of the QUARKS survey,describing the ACA observations and data *** multiwavelength data,we provide the first edition of QUARKS atlas,offering insights into the multiscale and multiphase interstellar medium in high-mass star *** ACA 1.3 mm catalog includes 207 continuum sources that are called ACA *** gas kinetic temperatures are estimated using three formaldehyde transitions with a non-LTE radiation transfer model,and the mass and density are derived from a dust emission *** ACA sources are massive(16–84 percentile values of 6–160 M_(⊙)),gravity-dominated(M∝R^(1.1))fragments within massive clumps,with supersonic turbulence(M>1)and embedded star-forming *** find a linear correlation between the masses of the fragments and the massive clumps,with a ratio of 6%between the *** considering fragments as representative of dense gas,the ratio indicates a dense gas fraction(DGF)of 6%,although with a wide scatter ranging from 1%to 10%.If we consider the QUARKS massive clumps to be what is observed at various scales,then the size-independent DGF indicates a self-similar fragmentation or collapsing mode in protocluster *** the ACA data over four orders of magnitude of luminosity-to-mass ratio(L/M),we find that the DGF increases significantly with L/M,which indicates clump evolutionary *** observed a limited fragmentation at the subclump scale,which can be explained by a dynamic global collapse process.

关键词： stars:formation ISM:kinematics and dynamics ISM:clouds stars:protostars

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：