检索结果-南通市图书馆

Expanded Porphyrin Exhibiting Off-Centered Out-of-Plane Coordination to Dysprosium

CCS Chemistry 2024年第7期6卷 1731-1738页

作者： Dmitry I.Nazarov Jorge Labella Alexey v.Kuzmin Maxim A.Faraonov Evgenii N.Ivanov Salavat S.Khasanov Tomas Torres Mikhail K.Islyaikin dmitri v.konare. Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS 142432 Chernogolovka Department of Organic Chemistry Universidad Autonoma de Madrid28049 Madrid Institute of Solid-State Physics RAS 142432 Chernogolovka Research Institute of Macroheterocycles Ivanovo State University of Chemistry and Technology15300 Ivanovo G.A.Krestov Institute of Solution Chemistry of the Russian Academy of Sciences 153045 Ivanovo Institute for Advanced Research in Chemical Sciences Universidad Autonoma de Madrid28049 Madrid IMDEA-Nanociencia 28049 Madrid

The complexation of high-spin lanthanides to porphyrinoids is a powerful strategy for the development of advanced molecular *** this context,the use of expanded porphyrinoids remains elusive since their coordination chemistry is challenging to ***,taking inspiration from on-surface chemistry,we explored the coordination of Dy^(3+)to a six-membered porphyrinoid,namely,the hemihexaphyrazine ***,we observed the selective formation of a mono-nuclear off-centered,out-of-plane H_(2)Hhp-Dy^(3+)complex when performing the complexation under reductive *** this reaction,the oxidation state of the macrocycle did not *** X-ray diffraction analysis,we found that the coordination number of Dy in this complex was *** macrocycle cocrystallized with decamethylcobaltocene(Cp_(2)^(*)Co)molecules,giving rise to a wellordered solid-state packing,governed byπ-π*** a result of this organization,a small magnetic coupling between the neighboring molecules was *** in all,this work provides key insights into the coordination of magnetically active metals with expanded porphyrinoids,thus motivating the development of advanced spintronic devices.

关键词： porphyrins dysprosium macrocycle coordination chemistry magnetism

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

Outstanding strength and conductivity of metallic glass composites with multiscale configuration

引用

Rare Metals 2023年第9期42卷 3099-3113页

作者： Wei-Zong Bao Jie Chen Jun-Zhi Li Bo-Hua Yu Chu-Yuan Liu Ping Jiang Zu-Jia Liu Kai-Tao Hu dmitri v.Louzguine-Luzgin Guo-Qiang Xie School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen518055China Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai980-8577Japan MathAM-OIL National Institute of Advanced Industrial Science and Technology(AIST)Sendai980-8577Japan State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China

Cu-based composites with multiscale configuration for electrical contact applications are fabricated via a ball milling(BM)-spark plasma sintering(SPS)-aging *** strengthening of the Cu alloy matrix by micro-scale metallic glass particles and nanoscale intracrystalline precipitation phases is *** annealing technique achieves the decomposition of solute atoms in the Cu alloy,ensuring the excellent electrical properties of the matrix conductive *** composite with multiscale configuration achieves an outstanding combination of ultimate compressive strength of(1114±15)MPa and electrical conductivity of 33.0%±1.1%International Annealed Copper Standard(IACS)after annealing at 400.C for 10.0 *** of the strengthening and conductivity mechanisms suggests that the precipitation of the Cr-rich phase within the matrix crystals is a critical contributor to the concerted enhancement of strength and *** addition,the positive role of nanocrystals precipitated at the edges of metallic glass particles on the interfacial bonding of composites is addressed.

关键词： Metallic glass composites Multiscale configuration Strength Conductivity

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

Hot spots of DNA double-strand breaks and genomic contacts of human rDNA units are involved in epigenetic regulation

引用

分子细胞生物学报:英文版 2015年第4期7卷 366-382页

作者： Nickolai A.Tchurikov Daria M.Fedoseeva dmitri v.Sosin Anastasia v.Snezhkina Nataliya v.Melnikova Anna v.Kudryavtseva Yuri v.Kravatsky Olga v.Kretova Department of Epigenetic Mechanisms of Gene Expression Regulation Engelhardt Institute of Molecular BiologyMoscow 119334Russia Group of Postgenomic Studies Engelhardt Institute of Molecular BiologyMoscow 119334Russia Laboratory of DNA-Protein Interactions Engelhardt Institute of Molecular BiologyMoscow 119334Russia

DNA double-strand breaks(DSBs)are involved in many cellular mechanisms,including replication,transcription,and genome *** recent observation that hot spots of DSBs in human chromosomes delimit DNA domains that possess coordinately expressed genes suggests a strong relationship between the organization of transcription patterns and hot spots of *** this study,we performed mapping of hot spots of DSBs in a human 43-kb ribosomal DNA(rDNA)repeated *** observed that rDNA units corresponded to the most fragile sites in human chromosomes and that these units possessed at least nine specific regions containing clusters of extremely frequently occurring DSBs,which were located exclusively in non-coding intergenic spacer(IGS)*** hot spots of DSBs corresponded to only a specific subset of DNase-hypersensitive sites,and coincided with CTCF,PARP1,and HNRNPA2B1 binding sites,and H3K4me3 *** rDNA-4C data indicate that the regions of IGS containing the hot spots of DSBs often form contacts with specific regions in different chromosomes,including the pericentromeric regions,as well as regions that are characterized by H3K27ac and H3K4me3 marks,CTCF binding sites,ChIA-PET and RIP signals,and high levels of *** data suggest a strong link between chromosome breakage and several different mechanisms of epigenetic regulation of gene expression.

关键词： double-strand breaks fragile sites rDNA IGS PARP1 HNRNPA2B1 4C

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

A Check-List of the Spiders (Araneae) of the Bolshekhekhtsyrski Nature Reserve,Khabarovsk Province,the Russian Far East

引用

蛛形学报 2007年第1期16卷 37-64页

作者： Yuri M.Marusik Andrei v.Tanasevitch dmitri K.Kurenshchikov dmitri v.Logunov Institute for Biological Problems of the North FEB RAS Portovaya Str. 18Magadan 68500Russia All-Russian Research Institute for Nature Protection Ministry of the Protection of the Environment and Natural Resources of the Russian FederationMoscowRussia Institute for Aquatic and Ecological Problems Kim-Yu-Chen Str. 65Khabarovsk 680063 The Manchester Museum The University of ManchesterOxford RoadManchester M13 9PLUK.

326 species of spiders belonging to 26 families are recorded from the Bolshekhekhtsyrski State Nature Reserve,of them 70 are new records for the reserve and six are new to the fauna of Russia:Asperthorax borealis Ono et Saito,2001; Cyclosa kumadai Tanikawa,1992; Cyclosa okumae Tanikawa,1992(earlier it was identified as C. argenteoalba Bosenberg et Strand,1906); Haplodrassus taepaikensis Paik,1992; Hypselistes fossilobus Fei et Zhu,1993; and Pachygnatha gaoi Zhu et al.,2003. The name Pronous minutus (S. Saito,1939) is synonymized with Pronoides brunneus Schenkel,1936. The male of H. taepaikensis is illustrated for the first time. Composition of the fauna is briefly discussed; 41% of the recorded species have their ranges confined to the SE Palaearctics. By its species diversity,the reserve's fauna is the second largest local fauna eastward of the Urals. An expected spider diversity of this reserve is likely to be over 400 species.

关键词：蜘蛛俄罗斯新记录新种哈巴罗夫斯克省蛛形目

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

Boron nitride nanotube growth via boron oxide assisted chemical vapor transport-deposition process using LiNO3 as a promoter

引用

Nano Research 2015年第6期8卷 2063-2072页

作者： Andrei T. Matveev Konstantin L. Firestein Alexander E. Steinman Andrey M. Kovalskii Oleg I. Lebedev Dmitry v. Shtansky dmitri Golberg National University of Science and Technology 'MISIS' Leninskiy prospect 4 Moscow 119049 Russia CRISMAT UMR 6508 CNRS-ENSICAEN 6BdMarechalJuin Caen 14050 France Institute for Materials Science (NIMS) Namiki 1 Ibaraki Tsukuba 3050044 Japan

高纯净的直、分离的 multiwalled 硼氮化物 nanotubes (BNNT ) 作为一个倡导者用浮雕 3 与氨经由硼氧化物蒸汽反应被种。硼氧化物的仅仅踪迹数量被精力散的 X 光检查(EDX ) 和拉曼光谱学在 BNNT 作为杂质检测。硼氧化物蒸汽从 B 的混合... 详细信息

高纯净的直、分离的 multiwalled 硼氮化物 nanotubes (BNNT ) 作为一个倡导者用浮雕 3 与氨经由硼氧化物蒸汽反应被种。硼氧化物的仅仅踪迹数量被精力散的 X 光检查(EDX ) 和拉曼光谱学在 BNNT 作为杂质检测。硼氧化物蒸汽从 B 的混合物被产生， FeO ，吗并且 MgO 粉末加热了到 1,150 爠灥潲畤楣汢?湡?楨桧祬愠瑣癩??卒攠晦'太B?獕湩?桴?牵档湩氭歩?杁??牡慲獹愠??卒猠'T瑳慲整?ㄠ????猯灵￣?楤畢祴?桰桴污瑡?愨洠浥敢?景瀠慬瑳捩穩牥?慦業祬?湡??‵殣?岣僫篤蔿藏????鐿???????脿???鯀魈鱋??︿????????????璣阿??鲣??觎????鑔鍽???????????恘? 恘？？

关键词：氮化硼纳米管生长机理化学气相传输氧化硼沉积过程硼氮纳米管温度范围卷曲纤维

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

Atrial fibrillation among Russian men and women aged 55 years and older:prevalence,mortality,and associations with biomarkers in a population-based study

引用

Journal of Geriatric Cardiology 2020年第2期17卷 74-84页

作者： Maria A.Shkolnikova dmitri A.Jdanov Rukizhat A.Ildarova Natalia v.Shcherbakova Ekaterina B.Polyakova Evgeny N.Mikhaylov Svetlana A.Shalnova vladimir M.Shkolnikov veltischev Research and Clinical Institute for Pediatrics of the Pirogov Russian National Research Medical University MoscowRussian Federation Laboratory of Demographic Data Max Planck Institute for Demographic ResearchRostockGermany International Laboratory for Population and Health Research University Higher School of EconomicsMoscowRussian Federation Arrhythmia Department and Neuromodulation Laboratory Almazov National Medical Research CentreSaint-PetersburgRussian Federation National Research Center for Preventive Medicine MoscowRussian Federation

Objective To examine the prevalence of atrial fibrillation(AF),its impacts on cardiovascular disease(CvD)and all-cause mortality,and the associations between AF and inflammatory and serum biomarkers in a population-based sample of *** The study is a secondary analysis of data from the Stress,Aging and Health in Russia(SAHR)survey that includes information on 1800 individuals with an average age of 68.5 years at baseline,and on their subsequent mortality during 7.4 years on *** is detected by 12-lead electrocardiogram(ECG)and 24-hour Holter *** statistical analysis includes proportional hazard and logistic regression *** Of the 1732 participants with relevant Holter data,AF was detected in 100(74 by ECG and Holter,26 by Holter only).The prevalence of AF was 5.8%for men and 7.4%for *** fully adjusted model showed strongly elevated hazard of CvD and all-cause mortality in men and women with long non-self-limiting AF(LAF).LAF was found to be negatively associated with elevated total and lowdensity lipoprotein cholesterol and to be positively associated with elevated markers of inflammation in *** The study assessed for the first time the prevalence and the risks of death related to AF among older *** was shown to be a strong and independent predictor of CvD and all-cause *** is unlikely to contribute to the large excess male mortality in *** finding that one-quarter of AF cases were detected only by Holter monitoring demonstrates the usefulness of diagnostics with prolonged ECG registration.

关键词： Aging Atrial fibrillation Gender differences Holter monitoring Mortality Prevalence

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

Nanotubes in a Gradient Electric Field as Revealed by STM TEM Technique

引用

Nano Research 2008年第2期1卷 166-175页

作者： dmitri Golberg Pedro M.F.J.Costa Masanori Mitome Yoshio Bando Nanoscale Materials Center Namiki 1-1TsukubaIbaraki 305-0044Japan International Center for Materials Nanoarchitectonics(MANA) National Institute for Materials ScienceNamiki 1-1TsukubaIbaraki 305-0044Japan Center for Research in Ceramics and Composite Materials University of Aveiro3810-193 AveiroPortugal

We have investigated the behavior of two nanotube systems,carbon and boron nitride,under controlled applied voltages in a high-resolution transmission electron microscope(TEM)equipped with a scanning tunneling microscope(STM)*** nanotubes(or thin bundles)were positioned between a piezo-movable gold electrode and a biased(up to±140 v)STM tip inside the pole-piece of the *** structures studied include double-and multi-walled carbon nanotubes(the latter having diverse morphologies due to the various synthetic procedures utilized),few-layered boron nitride nanotube bundles and multi-walled boron nitride nanotubes(with or without functionalized surfaces).The electrical breakdown,physical failure,and electrostatic interactions are documented for each system.

关键词： Carbon nanotubes boron nitride nanotubes transmission electron microscope scanning tunneling microscope

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

Positional Information Storage in Sequence Patterns

引用

Computational Molecular Bioscience 2013年第2期3卷 18-26页

作者： Alexey A. Shadrin Andrei Grigoriev dmitri v. Parkhomchuk Biology Department Center for Computational and Integrative Biology Rutgers University Camden USA Fachbereich Mathematik und Informatik Freie Universitat Berlin Berlin Germany Institut für Medizinische Genetik und Humangenetik der Charité—Universitatsmedizin Berlin Berlin Germany

We build a model of storage of well-defined positional information in probabilistic sequence patterns. Once a pattern is defined, it is possible to judge the effect of any mutation in it. We show that the frequency of beneficial mutations can be high in general and the same mutation can be either advantageous or deleterious depending on the pattern’s context. The model allows to treat positional information as a physical quantity, formulate its conservation law and to model its continuous evolution in a whole genome, with meaningful applications of basic physical principles such as optimal efficiency and channel capacity. A plausible example of optimal solution analytically describes phase transitions-like behavior. The model shows that, in principle, it is possible to store error-free information on sequences with arbitrary low conservation. The described theoretical framework allows one to approach from novel general perspectives such long-standing paradoxes as excessive junk DNA in large genomes or the corresponding G- and C-values paradoxes. We also expect it to have an effect on a number of fundamental concepts in population genetics including the neutral theory, cost-of-selection dilemma, error catastrophe and others.

关键词： Information Theory Sequence Pattern Genetic Information Conservation Typical Set

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

大型电弧离子镀膜设备

大型电弧离子镀膜设备

引用

TFC’03全国薄膜技术学术研讨会

作者：马占吉任妮 dmitri A.Karpov 兰州空间物理研究所 D.v.Efremov Scientific Research Institute of Electrophysical Apparatus St-PetersburgRussian

本文描述了大型电弧离子镀膜设备的结构设计和镀膜工艺实验。该设备是由水冷真空室(容积为18m)、抽气系统、压力检测系统、四通道供气子系统、加热子系统(真空室内加热温度范围:室温～400℃)、电源子系统和控制系统组成。真空室的极限...

本文描述了大型电弧离子镀膜设备的结构设计和镀膜工艺实验。该设备是由水冷真空室(容积为18m)、抽气系统、压力检测系统、四通道供气子系统、加热子系统(真空室内加热温度范围:室温～400℃)、电源子系统和控制系统组成。真空室的极限压力在1h内可达到5×10Pa,工作压力范围2～0.02 Pa。真空室由简体和两个端盖以及真空室内行星运动的工件架和导轨组成,均由不锈钢制

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

Realizing Attosecond Core-Level X-ray Spectroscopy for the Investigation of Condensed Matter Systems

引用

Ultrafast Science 2023年第4期3卷 1-13页

作者： Adam M.Summers Stefano Severino Maurizio Reduzzi Themistoklis P.H.Sidiropoulos Daniel E.Rivas Nicola Di Palo Hung-Wei Sun Ying-Hao Chien Iker Leon Barbara Buades Seth L.Cousin Stephan M.Teichmann Tobias Mey Klaus Mann Barbara Keitel Elke Plonjes dmitri K.Efetov Heinrich Schwoerere Jens Biegert ICFO-Institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology08860 CastelldefelsBarcelonaSpain Linac Coherent Light Source SLAC National Accelerator LaboratoryMenlo ParkCA 94025USA European XFEL Holzkoppel 422869 SchenefeldGermany Institut für Nanophotonik Göttingen e.v. Hans-Adolf-Krebs-Weg 137077 GöttingenGermany Deutsches Elektronen-Synchrotron Notkestraße 8522607 HamburgGermany Max-Planck-Institut für Struktur und Dynamik der Materie 22761 HamburgGermany ICREA Pg.Lluís Companys 2308010 BarcelonaSpain

Unraveling the exact nature of nonequilibrium and correlated interactions is paramount for continued progress in many areas of condensed matter science. Such insight is a prerequisite to develop an engineered approach for smart materials with targeted properties designed to address standing needs such as efficient light harvesting, energy storage, or information processing. For this goal, it is critical to unravel the dynamics of the energy conversion processes between carriers in the earliest time scales of the excitation dynamics. We discuss the implementation and benefits of attosecond soft x-ray core-level spectroscopy up to photon energies of 600 ev for measurements in solid-state systems. In particular, we examine how the pairing between coherent spectral coverage and temporal resolution provides a powerful new insight into the quantum dynamic interactions that determine the macroscopic electronic and optical response. We highlight the different building blocks of the methodology and point out the important aspects for its application from condensed matter studies to materials as thin as 25 nm. Furthermore, we discuss the technological developments in the field of tabletop attosecond soft x-ray sources with time-resolved measurements at the near and extended edge simultaneously and investigate the exciting prospective of extending such technique to the study of 2-dimensional materials.

关键词： Attosecond Science Core-level x-ray Spectroscopy High Harmonic Generation X-ray Absorption Ultrafast solid-state dynamics

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

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：