检索结果-南通市图书馆

The protein translocase family YidC/Oxa/Alb3:Phylogenetic Distribution and Evolution in the Three Domains of Life

在线全文

学校读者我要写书评

暂无评论

The protein translocase family YidC/Oxa/Alb3:Phylogenetic Di...

Recent progress in the applications of presynaptic dopaminergic positron emission tomography imaging in parkinsonism

第三届细胞结构与功能的信号基础研讨会

作者： Yu-Juan Zhang,hai-Feng tian,jian-Fan Wen Kunming Institute of Zoolozy,the Chinese Academy of Sciences,Kunming 650223

YidC/Oxa/Alb3 is a protein translocase family playing an essential role in protein inserting into inner membranes of bacteria and mitochondria,and chloroplast thylakoid membranes,*** mitochondria and chloroplasts are endosymbiotic organelles from bacterial ancestors,it is easy to consider Oxa and Alb3,like many other mitochondrial/chloroplastic proteins,to have directly derived from the preexisting protein (YidC) of their bacterial *** order to test this supposition and to investigate the evolutionary history of the whole family in the three domains of life,we comprehensively investigated the phylogenetic distribution and phylogeny of the family in the three domains of *** following observation was obtained:1) It was confirmed in a much wider species range than before that YidC homologs also exist in Archaea but distribute limitedly in some Euryarchaeota;2) As reported previously,most bacteria have only one YidC,but some Actinobacteria and one Clostridia also have two;3) Eukaryotic Oxa and Alb3 have two independent prokaryotic origins,they were not inherited from the YidC of the endosymbiotic ancestors(proteobacteria and cynobacteria) of mitochondria and chloroplasts,respectively, instead,Oxa might arise from the YidC homolog of Euryarchaeota possibly through the fusion of archaea with bacteria in the origin of eukaryotic celts,while Alb3 probably originated from the YidC of an unknown kind of bacterium;4) An ancient duplication occurred immediately after the origins of Oxa and Alb3,and thus eukaryotes generally possess two Oxa and two Alb3,but secondary loss,duplication or acquisition of new domain, occured in some lineages,especially in protists,which resulted in a rich diversity or adaptive differentiation of the two translocases in *** on these,a model for the evolutionary history of the whole YidC/Oxa/Alb3 family in the three domains of life is proposed.

关键词： Translocase YidC/Oxa/A1b3 Distribution Evolution

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

Neural Regeneration Research 2025年第1期20卷 93-106页

作者： Yujie Yang Xinyi Li Jiaying Lu Jingjie Ge Mingjia Chen Ruixin Yao Mei tian jian Wang Fengtao Liu Chuantao Zuo Key Laboratory of Arrhythmias Ministry of EducationDepartment of Medical GeneticsShanghai East HospitalSchool of MedicineTongji UniversityShanghaiChina Department of Neurology National Research Center for Aging and MedicineNational Center for Neurological Disordersand State Key Laboratory of Medical NeurobiologyHuashan HospitalFudan UniversityShanghaiChina Department of Nuclear Medicine&PET Center National Center for Neurological Disordersand National Clinical Research Center for Aging and MedicineHuashan HospitalFudan UniversityShanghaiChina International Human Phenome Institutes(Shanghai) ShanghaiChina Human Phenome Institute Fudan UniversityShanghaiChina

Nowadays,presynaptic dopaminergic positron emission tomography,which assesses deficiencies in dopamine synthesis,storage,and transport,is widely utilized for early diagnosis and differential diagnosis of *** review provides a comprehensive summary of the latest developments in the application of presynaptic dopaminergic positron emission tomography imaging in disorders that manifest *** conducted a thorough literature search using reputable databases such as PubMed and Web of *** criteria involved identifying peer-reviewed articles published within the last 5 years,with emphasis on their relevance to clinical *** findings from these studies highlight that presynaptic dopaminergic positron emission tomography has demonstrated potential not only in diagnosing and differentiating various Parkinsonian conditions but also in assessing disease severity and predicting ***,when employed in conjunction with other imaging modalities and advanced analytical methods,presynaptic dopaminergic positron emission tomography has been validated as a reliable in vivo *** validation extends to screening and exploring potential neuropathological mechanisms associated with dopaminergic *** summary,the insights gained from interpreting these studies are crucial for enhancing the effectiveness of preclinical investigations and clinical trials,ultimately advancing toward the goals of neuroregeneration in parkinsonian disorders.

关键词： aromatic amino acid decarboxylase brain imaging dopamine transporter Parkinson’s disease parkinsonism positron emission tomography presynaptic dopaminergic function vesicle monoamine transporter type 2

Stability of Fullerene Cages:C_(30) to C_(70) and Their Dependence on Shared Pentagon Bonds

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2006年第9期25卷 1051-1056页

作者： WU hai-Shun tian Xin-Xin jian jian-Feng FENG Rui-Juan Chemistry and Material Science Institute Shanxi Normal University Linfen 041004 China

The topological characters of all fullerene isomers from C30 to C70 with respect to their number of shared pentagon bonds have been investigated. Systematic calculations were also carried out at the B3LYP/6-31G^＊ level. It is found that the most stable structure has the smallest number of shared pentagon bonds, and the relative energies of a given size show an increasing tendency to rise with Nss number which denotes the number of C-C bonds shared by pentagon. The topological criterion that has extremely low computational cost can be used as filtering principle to prescreen the thermodynamically viable fullerenes and predict the relative stability of isomers.

关键词： fullerene density functional theory most stable isomer topology Nss

Influence of Intrinsic Decoherence on Entanglement in Two-Qubit Quantum Heisenberg XYZ Chain

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第2X期44卷 255-258页

作者： SHAO Bin ZENG tian-hai ZOU jian Department of Physics Beijing Institute of Technology Beijing 100081 China

Taking the intrinsic decoherence effect into account, we investigate the time evolution of entanglement for two-qubit XYZ Heisenberg model in an external uniform magnetic field. Concurrence, the measurement of entanglement,is calculated. We show how the intrinsic decoherence modifies the time evolution of the entanglement and find that at short-time case, concurrence is oscillating as increasing magnetic field, which implies that entanglement may be enhanced or weakened in some time regions.

关键词： entanglement intrinsic decoherence Heisenberg chain

Entanglement Transfer Between Cavity Fields and Excitons in a Driven Quantum Dot System

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第4X期48卷 645-648页

作者： ZENG tian-hai SHAO Bin ZOU jian Department of PhysiCs Beijing Institute of Technology Beijing 100081 China

We investigate entanglement transfer from two separate cavities to the excitons in two quantum dots separately placed in the two cavities. The cavity fields and the excitons are treated as two continuous-variable （CV） subsystems. The time-dependent characteristic functions in the Wigner representation for the two subsystems are analytically obtained. Under the conditions that one of the two CV subsystems is initially prepared in a two-mode squeezed vacuum state and the other in its lowest energy state, we show that the entanglement reciprocation between the cavity fields and the excitons is realizable.

关键词： entanglement transfer quantum dot logarithmic negativity

Load reduction sintering for increasing productivity and decreasing fuel consumption

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2013年第2期20卷 131-137页

作者： hai-bin Zuo jian-liang Zhang Zheng-wen Hu tian-jun Yang State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

The technical and economical indexes and the physical properties of load reduction sintering processes with the supporting stands of installation at different height levels （300, 350, and 400 mm）： in a sintering bed were studied under the same conditions of raw material, bed height, and sintering parameters. Sintering pot tests with different bed heights and fuel ratios of the mixture with or without supporting stands were performed to decrease the fuel consumption. The airflow rate through the sintering bed was measured with an anemoscope fixed on the bed surface to reveal the effects of supporting stands. The utilization of load reduction sintering can improve the permeability of the sintering bed, and the airflow rate through the sintering bed is increased. When the stand height is half of the sintering bed, the productivity increases by 27.9%, and the drum index slightly decreases. Keeping at the same productivity level with normal sintering, the utilization of load reduction sintering can decrease the solid fuel consumption by 9.2%.

关键词： ore sintering permeability productivity fuel consumption

Impact of Temperature on Mortality in Three Major Chinese Cities

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2014年第7期27卷 485-494页

作者： ZHANG Jing LI tian tian TAN jian Guo HUANG Cun Rui KAN hai Dong School of Public Health Key Laboratory of Public Health Safety of Ministry of EducationFudan University Institute of Environmental Health and Related Product Safety China Center for Disease Control and Prevention Shanghai Key Laboratory of Meteorology and Health Shanghai Meteorological InstituteSMB School of Public Health and Institute of Health and Biomedical Innovation Queensland University of Technology Research Institute for the Changing Global Environment and Fudan Tyndall Centre Fudan University Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Fudan University

Objective To study the relation between temperature and mortality by estimating the temperature-related mortality in Beijing, Shanghai, and Guangzhou. Methods Data of daily mortality, weather and air pollution in the three cities were collected. A distributed lag nonlinear model was established and used in analyzing the effects of temperature on mortality. Current and future net temperature-related mortality was estimated. Results The association between temperature and mortality was J-shaped, with an increased death risk of both hot and cold temperature in these cities. The effects of cold temperature on health lasted longer than those of hot temperature. The projected temperature-related mortality increased with the decreased cold-related mortality. The mortality was higher in Guangzhou than in Beijing and Shanghai. Conclusion The impact of temperature on health varies in the 3 cities of China, which may have implications for climate policy making in China.

关键词： Climate change Temperature Mortality Time-series

Effects of Degrees of Motion Freedom on Free-Fall of A Sphere in Fluid

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2018年第5期32卷 605-613页

作者： LIU Lei YANG jian-min LYU hai-ning tian Xin-liang PENG Tao State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration(CISSE) Shanghai 200240China

Free-fall of a sphere in fluid is investigated at a Galileo number of 204 by direct numerical simulations(DNS). We mainly focus on the effects of different degrees-of-freedom(DOFs) of the sphere motion during free-fall. The characteristics of free-fall are compared with those of flow past a fixed sphere. Additional numerical tests are conducted with constraints placed on the translational or rotational DOFs of the sphere motion to analyze different DOFs of sphere motion. The transverse motion contributes significantly to the characteristics of free-fall; it results in the retardation of the vortex shedding, leading to the decrease of the Strouhal number. In addition, the transversal sphere motion exhibits the tendency to promote the sphere rotation. On the contrary, the effects of the sphere rotation and vertical oscillations during free-fall are negligible.

关键词： free-fall direct numerical simulation degree of motion freedom

A novel active-passive protection strategy endows carbonyl iron with excellent intelligent anti-corrosion and microwave absorption dual functional characteristics

在线全文

学校读者我要写书评

暂无评论

Nano Research 2025年第1期18卷 487-500页

作者： Wei tian Quanyuan Feng Linbo Zhang Yinfan Liu Xian jian Longjiang Deng Institute of Microelectronics School of Information Science and TechnologySouthwest Jiaotong UniversityChengdu 611756China National Engineering Researching Centre of Electromagnetic Radiation Control Materials Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of EducationState Key Laboratory of Electronic Thin Films and Integrated DevicesSchool of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 611731China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China The Yangtze Delta Region Institute(Huzhou)&School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaHuzhou 313001China

Carbonyl iron absorbers(CI)face significant challenges in practical applications,such as corrosion,interface bonding failure,detachment,and high maintenance ***,we have developed intelligent self-healing technology based on proactive/passive mechanisms via in situ synthesis of self-healing factors(polydopamine/benzotriazole(PDA/BTA))and physical barrier layers(SiO_(2)/1,1,1,3,3,3-hexamethyl disilazane,SiO_(2)/HMDS)to enhance corrosion resistance,while also being compatible with efficient microwave absorption *** unique multiscale structure gives full play to the utilization of the roles of each functional layer,including the intelligent self-healing features of PDA/BTA,physical shielding and spatial confinement characteristics of SiO_(2)/HMDS,and magnetic-dielectric synergistic mechanism resulted from the good impedance matching characteristics,the conduction loss,the interfacial polarization loss and natural *** asfabricated composites achieved an exceptional minimum reflection loss value of-55.4 dB at 10.7 GHz and the effective absorption band of 7.6 ***,it still exhibits obvious self-healing and corrosion resistance characteristics after 360 h corrosion treatment,ascribed to the self-healing mechanism of PDA/BTA and the blocking intervention effect of SiO_(2)/*** work is considered to pave the way for the synthesis of high-performance magnetic absorbers,especially in enhancing their intelligent self-healing ability in corrosive environments.

关键词： microwave absorption intelligent self-healing technology carbonyl iron multiscale structure magneticdielectric synergistic mechanism