检索结果-南通市图书馆

Investigation of Linear Tetra-Atomic Negative Ion by Photodetached-Electron Spectra

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第8期28卷 87-90页

作者： A.Rahman Iftikhar Ahmad A.Afaq M.haneef h.J.zhao Department of Physics Hazara UniversityMansehraPakistan Department of Physics University of MalakandChakdaraPakistan Centre of Excellence in Solid State Physics University of the PunjabQuid-e-Azam CampusLahore-54590Pakistan School of Physics and Information Science Shanxi Normal UniversityLinfen 041004

Photodetachment spectra from a linear tetra-atomic negative ion is investigated by treating the detached-electron wave function quantum mechanically.A plane polarized laser light,perpendicular to the axis of the ion,is used to detach the electron from the *** expressions for the electron flux and total photodetachment cross section are *** electron flux on screen shows strong-energy-dependent oscillations with different *** total cross section of the tetra-atomic negative ion reduces the cross section of mono-atomic,diatomic and triatomic negative ions for high energy photons,while for low energy photons it becomes four times the cross section of mono-atomic negative ions.

关键词： Electron polarized Investigation

Saluenolide A,A Novel Eremophilanolide from Senecio saluenensis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2002年第4期13卷 333-334页

作者： Yu zhao Peng WANG Simon PARSONS David W.h. RANKIN DepartmentofNaturalDrugResearch CollegeofPharmaceuticalSciencesZhejiangUniversityHangzhou310031

From Senecio saluenensis, a novel eremophilanolide Saluenolide A was isolated. Its structure was elucidated by 2D-NMR technique and X-ray diffraction.

关键词： Sesquiterpene eremophilanolide Senecio X-ray cytotoxicity.

Brain of the blind:transcriptomics of the golden-line cavefish brain

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2018年第6期64卷 765-773页

作者： Fanwei MENG Yahui zhao Tom TITUS Chunguang ZhANG John h.POSTLEThWAIT State Key Laboratory of Membrane Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China Key Laboratory of Zoological Systematics and Evolution Institute of ZoologyChinese Academy of SciencesBeijing 100101China Institute of Neuroscience University of OregonEugeneOR 97403USA

The genus Sinocyclocheilus (golden-line barbel) includes 25species of cave-dwelling blind fish (cavefish)and more than 30 surface-dwelling species with normal *** environments are dark and generally nutrient-poor with few *** of several genera evolved convergent morphological adaptations in visual,pigmentation,brain,olfactory,and digestive systems. We compared brain morphology and gene expression patterns in a cavefish Sinocyclocheilus anophthalmus with those of a closely related surface-dwelling species *** showed that cavefish have a longer olfactory tract and a much smaller optic tectum than surface *** by RNA-seq revealed that many genes upregulated in cavefish are related to lysosomes and the degradation and metabolism of proteins,amino acids,and *** down- regulated in cavefish tended to involve "activation of gene expression in cholesterol biosynthesis" and cholesterol degradation in the *** encoding Srebfs (sterol regulatory element- binding transcription factors)and Srebf targets,including enzymes in cholesterol synthesis,were downregulated in cavefish brains compared with surface fish *** gene encoding Cyp46a1, which eliminates cholesterol from the brain,was also downregulated in cavefish brains,while the total level of cholesterol in the brain remained *** brains misexpressed several genes encoding proteins in the hypothalamus-pituitary axis,including Trh,Sst,Crh,Pomc,and *** results suggest that the rate of lipid biosynthesis and breakdown may both be depressed in golden-line cavefish brains but that the lysosome recycling rate may be increased in cavefish;properties that might be related to differences in nutrient availability in caves.

关键词： cavefish cholesterol cyp46a optic tectum Sinocyclocheilus transcriptomics

The Role of TNF Related Apoptosis-Inducing Ligand in Neurodegenerative Diseases

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2005年第2期2卷 113-122页

作者： Y.huang N.Erdmann h.Peng Y.zhao ThelaboratoryofNeurotoxicologyattheCenterforNeurovirology＆NeurodegenerativeDisorders ／／Dept.Pharmacology Dept.ofSurgery UniversityofNebraskaMedicalCenterOmahaNE68198-5880USA／／InstituteofAnimalResearchChineseAcademyofScienceChina

A hallmark of all forms of neurodegenerative diseases is impairment of neuronal functions,and in many cases neuronal cell *** the etiology of neurodegenerative diseases may be distinct,different diseases display a similar pathogenesis,for example abnormal immunity within the central nervous system(CNS),activation of macrophage/microglia and the involvement of proinflammatory *** studies show that neurons in a neurodegenerative state undergo a highly regulated programmed cell death,also called ***-related apoptosis-inducing ligand(TRAIL),a member of the TNF family,has been shown to be involved in apoptosis during many *** one member of a death ligand family,TRAIL was originally thought to target only tumor cells and was not present in ***,recent data showed that TRAIL was unregulated in hIV-1-infected and immune-activated macrophages,a major disease inducing cell during hIV-1-assoeiated dementia(hAD).TRAIL is also induced on neuron by β-amyloid protein,an important pathogen for Alzheimer's *** this review,we summarize the possible common aspects that TRAIL involved those neurodegenerative diseases,TRAIL induced apoptosis signaling in the CNS cells,and specific role of TRAIL in individual *** & Molecular Immunology.2005;2(2):113-122.

关键词： Alzheimer's disease hⅣ-1 associated dementia multiple sclerosis apoptosis TRAIL macrophage

Properties Correlations and Characterization of Athabasca Oil Sands-derived Synthetic Crude Oil

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2007年第3期4卷 84-90页

作者： Wang Jun zhao Suoqi Xu Chunming Chung Keng h. State Key Laboratory of heavy Oil Processing China University of Petroleum Beijing 102249 China Petrochemical Institute of PetroChina Beijing 10083 China EnergyINet Calgary Alberta Canada

Narrow fractions of Athabasca oil sands-derived synthetic crude oil （SCO） from Canada were obtained by distillation at 20 ℃ to 500 ℃ and characterized. The yield and properties, such as density, refractive index, viscosity, freezing point, sulfur and nitrogen content and UOP K-index, were correlated as a function of boiling temperature （Tb）. The properties of naphtha fractions, jet fuel and diesel fractions could be predicted accurately with the correlations, which are useful for process design considerations, such as optimizing operating conditions of refinery processing units. The other key properties and characteristics of naphtha fractions, jet fuel, diesel and vacuum gas oil were also determined.

关键词： SCO properties correlation characterization

Radio-frequency magnetron sputtered thin-film La_(0.5)Sr_(0.5)Co_(0.95)Nb_(0.05)O_(3-δ) perovskite electrodes for intermediate temperature symmetric solid oxide fuel cell(IT-SSOFC)

在线全文

学校读者我要写书评

暂无评论

Materials Reports(Energy) 2022年第2期2卷 75-85页

作者： vicky Dhongde Aditya Singh Jyotsana Kal Uzma Anjum M.Ali haider Suddhasatwa Basu Chemical Engineering Department Indian Institute of Technology DelhiHauz KhasNew Delhi110016India Department of Physics Indian Institute of Technology DelhiHauz KhasNew Delhi110016India National University of Singapore 21 Lower Kent Ridge Rd119077Singapore

The present work explores the application of La_(0.5)Sr_(0.5)Co_(0.95)Nb_(0.05)O_(3-δ)(LSCNO)perovskite as electrode material for the symmetric solid oxide fuel *** solid oxide fuel cells of thin-film LSCNO electrodes were prepared to study the oxygen reduction reaction at intermediate *** Rietveld refinement of syn-thesized material shows a hexagonal structure with the R-3c space group of the prepared perovskite *** parameter and fractional coordinates were utilized to calculate the oxygen ion diffusion coefficient for molecular dynamic *** 973 K,the oxygen ion diffusion of LSCNO was 1.407×10^(-8)cm^(2)s^(-1) higher by order of one magnitude than that of the La_(0.5)Sr_(0.5)Co_(0.95)Nb_(0.05)O_(3-δ)(7.751×10^(-9)cm^(2)^(-1)).The results suggest that the Nb doping provide the structural stability which improves oxygen anion *** enhanced structural stability was analysed by the thermal expansion coefficient calculated experimentally and from molecular dynamics ***,the density functional theory calculation revealed the role of Nb dopant for oxygen vacancy formation energy at Sr-0 and La-O planes is lower than the undoped *** understand the rate-limiting process for sluggish oxygen diffusion kinetics,80 nm and 40 nm thin films were fabricated using radio frequency magnetron sputtering on gadolinium doped ceria electrolyte *** impedance was observed to increase with an increasing thickness,suggesting the bulk diffusion as a rate-limiting step for oxygen ion *** electrochemical performance was analysed for the thin-flm symmetric solid oxide fuel cell,which achieved a peak power density of 390 mW cm^(-2) at 1.02 V in the presence of h_(2) fuel on the anode side and air on the cathode side.

关键词： Symmetric solid oxide fuel cell Thin-film electrode Diffusion coefficient Molecular dynamics Radio-frequency magnetron sputtering Intermediate temperature

Assessing the biogenicity and syngenicity of candidate bioalteration textures in pillow lavas of the～2.52 Ga Wutai greenstone terrane of China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2010年第2期55卷 188-199页

作者： McLOUGhLIN N FLIEGEL DJ FURNES h STAUDIGEL h SIMONETTI A zhao GuoChun ROBINSON P T Department of Earth Science and Center for Geobiology AUegaten 41 Bergen N-5007 Norway Scripps Institution of Oceanography University of California La Jolla CA 92093-0225 USA Department of Civil Engieering and Geological Sciences University of Notre Dame Indiana IN46556 USA Department of Earth Sciences The University of Hong Kong Pokfulam Road Hong Kong China Department of Earth Sciences Dalhousie University Halifax Nova Scotia B3H 4J1 Canada

住在 sub-seafloor 熔岩的微生物能够蚀刻暴烈的玻璃并且创造微米大小的隧道和坑。这些 bioalteration 踪迹的矿化作用保证这些质地熬过主人玻璃的变丑和转变到变形矿物质。如此的 bioalteration 质地的石块记录从在原处海洋的外壳在暴... 详细信息

住在 sub-seafloor 熔岩的微生物能够蚀刻暴烈的玻璃并且创造微米大小的隧道和坑。这些 bioalteration 踪迹的矿化作用保证这些质地熬过主人玻璃的变丑和转变到变形矿物质。如此的 bioalteration 质地的石块记录从在原处海洋的外壳在暴烈的玻璃以外远延长从 ophiolites 和前寒武纪的绿岩带包括元暴烈的玻璃。薄节从 N 的 Wutai 组从 2.52 Ga tholeiitic 枕头熔岩这里报导了的 petrographic 的调查。中国成立细丝状微质地。激光拉曼光谱学证实这些质地被 titanite 使矿物化。而且， Wutai 微质地在到从太古代的 greenschist 外形枕头熔岩的 bioalteration 质地的尺寸，形态学和分发是可比较的。在原处，诱导地由激光脱离多收集者 titanite 标明日期的 U-Pb 联合了团 spectrometry (LA-MC-ICP-MS ) 给 1.81 敢 ? 汢獥敳 ? 楷桴的年龄的血浆吗？

关键词：枕状熔岩候选人绿岩带纹理中国电感耦合等离子体质谱五台山地体

Materials Futures—an open access journal to serve the materials science community

在线全文

学校读者我要写书评

暂无评论

Materials Futures 2022年第1期1卷 1-2页

作者： J K zhao W h Wang T Brezesinski Songshan Lake Materials Laboratory Dongguan 523808GuangdongChina Institute of Physics Chinese Academy of SciencesBeijing 100190China Institute of Nanotechnology Karlsruhe Institute of Technology(KIT)Hermann-von-Helmholtz-Platz 1Eggenstein-Leopoldshafen 76344Germany

Materials Futures is co-published by the Songshan Lake Materials Laboratory and the UK’s IOP Publishing house,with support from the Institute of Physics,Chinese Academy of *** journal is dedicated to publishing seminal works in wide-ranging areas including metals and ceramics,energy materials,nanomaterials,quantum materials and *** scope covers studies regarding novel materials,materials properties and applications,as well as materials computation,theory and design(synthesis,processing,characterization etc).It strives to serve the research community and aims to become a top-tier journal for materials science.

关键词： journal Futures ceramics

Decreasing ruminal methane production through enhancing the sulfate reduction pathway

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Animal Nutrition 2022年第2期9卷 320-326页

作者： Yuchao zhao Guangyong zhao State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural University100193 BeijingChina

Methane(Ch4)production from ruminants accounts for 16%of the global greenhouse gas emissions and represents 2%to 12%of feed *** Ch_(4) production from ruminants is of great importance for sustainable development of the ruminant industry.h_(2) is the primary substrate for Ch_(4) production in the processes of ruminal *** reducing bacteria are able to compete with methanogens for h_(2) in the rumen,and consequently inhibit the *** the ruminal sulfate reducing pathway is an important approach to mitigate Ch_(4) emissions in *** review summarized the effects of sulfate and elemental S on ruminal methanogenesis,and clarified the related mechanisms through the impacts of sulfate and elemental S on major ruminal sulfate reducing *** the activities of the major ruminal sulfate reducing bacteria including Desulfovibrio,Desulfohalobium and Sulfolobus through dietary sulfate addition,elemental S and dried distillers grains with solubles can effectively decrease the ruminal Ch_(4) *** levels of dietary addition with different S sources for reducing the ruminal Ch_(4) production,as well as maintaining the performance and health of ruminants,need to be investigated in the future.

关键词： Methane Rumen Sulfur Sulfate reduction pathway