检索结果-南通市图书馆

利用低场核磁共振检测分析注水猪肉水分子弛豫特性

在线全文

学校读者我要写书评

暂无评论

食品安全质量检测学报 2017年第6期8卷 1980-1986页

作者：盖圣美张中会邹玉峰宋迪魏法山刘登勇渤海大学食品科学与工程学院辽宁省食品安全重点实验室生鲜农产品贮藏加工及安全控制技术国家地方联合工程研究中心锦州121013 南京农业大学国家肉品质量安全控制工程技术研究中心南京210095 河南省产品质量监督检验院郑州450004

目的运用低场核磁共振(low-field nuclear magnetic resonance,LF-NMR)技术分析样品检测质量及注水比例对水分子弛豫特性的影响。方法分析不同样品质量(1、2、3、4、5 g)对弛豫时间、峰总面积、峰面积比的影响,确定最佳样品质量;通过测... 详细信息

目的运用低场核磁共振(low-field nuclear magnetic resonance,LF-NMR)技术分析样品检测质量及注水比例对水分子弛豫特性的影响。方法分析不同样品质量(1、2、3、4、5 g)对弛豫时间、峰总面积、峰面积比的影响,确定最佳样品质量;通过测定不同注水比例(0%、10%、20%、30%、40%、50%)对猪肉弛豫特性的影响,分析注水后猪肉中的水分变化。结果样品质量为3 g时,弛豫时间、峰面积比的稳定性较好;随着注水比例的增加,不易流动水的起峰时间显著增加(P<0.05)、峰面积比显著减小(P<0.05);而自由水的起峰时间、峰顶点时间、峰面积比均显著增大(P<0.05)。结论在样品质量为3 g的条件下采样,有利于获得较为稳定的试验结果;将不易流动水和自由水的变化规律应用在注水肉检测方面,可使注水肉的检测更加方便、快捷。

关键词：注水肉弛豫水分

Non-canonical role of the ATR pathway in axon regeneration as a mechanosensitive brake

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2022年第11期17卷 2423-2424页

作者： feng Li yuanquan song Institute for Translational Brain Research Fudan UniversityShanghaiChina Raymond G.Perelman Center for Cellular and Molecular Therapeutics The Children’s Hospital of Philadelphiaand Department of Pathology and Laboratory MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA

DNA damage has been linked to *** DNA damage response(DDR)pathways help preserve DNA integrity in the nervous system during both the developmental and mature *** of factors in various signaling pathways responsive to different types of DNA damage have been associated with developmental syndromes with neurological symptoms(McKinnon,2009;Araújo and Kuraoka,2019;Khokhlova et al.,2020).

关键词： damage ATR DDR

Structure-based simulations complemented by conventional all-atom simulations to provide new insights into the folding dynamics of human telomeric G-quadruplex

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第7期30卷 646-654页

作者： yun-Qiang Bian feng song Zan-Xia Cao Jia-feng yu Ji-Hua Wang Shandong Key Laboratory of Biophysics Institute of BiophysicsDezhou UniversityDezhou 253023China

The hybrid atomistic structure-based model has been validated to be effective in investigation of G-quadruplex *** this study,we performed large-scale conventional all-atom simulations to complement the folding mechanism of human telomeric sequence Htel24 revealed by a multi-basin hybrid atomistic structure-based ***,the real time-scale of folding rate,which cannot be obtained from the structure-based simulations,was estimated directly by constructing a Markov state *** results show that Htel24 may fold as fast as on the order of milliseconds when only considering the competition between the hybrid-1 and hybrid-2 G-quadruplex ***,in comparison with the results of structure-based simulations,more metastable states were identified to participate in the formation of hybrid-1 and hybrid-2 *** findings suggest that coupling the hybrid atomistic structure-based model and the conventional all-atom model can provide more insights into the folding dynamics of DNA *** a result,the multiscale computational framework adopted in this study may be useful to study complex processes of biomolecules involving large conformational changes.

关键词： molecular dynamics simulation structure-based model all-atom model DNA G-quadruplex

Rational Quasi-Interpolation Approximation of Scattered Data in R^(3)

在线全文

学校读者我要写书评

暂无评论

Numerical Mathematics(Theory,Methods and Applications) 2018年第1期11卷 169-186页

作者： Renzhong feng Lifang song School of Mathematics and Systematic Science&Key Laboratory of Mathematics Informatics and Behavioral SemanticsMinistry of EducationBeijing University of Aeronautics and AstronauticsBeijing 100191China

This paper is concerned with a piecewise smooth rational quasi-interpolation with algebraic accuracy of degree(n+1)to approximate the scattered data in R *** firstly use the modified Taylor expansion to expand the mean value coordinates interpolation with algebraic accuracy of degree one to one with algebraic accuracy of degree(n+1).Then,based on the triangulation of the scattered nodes in R^(2),on each triangle a rational quasi-interpolation function is *** constructed rational quasi-interpolation is a linear combination of three different expanded mean value coordinates interpolations and it has algebraic accuracy of degree(n+1).By comparing accuracy,stability,and efficiency with the C^(1)-Tri-interpolation method of Goodman[16]and the MQ Shepard method,it is observed that our method has some computational advantages.

关键词： Scattered data mean value coordinates interpolation modified Taylor expansion rational quasi-interpolation algebraic accuracy

An active M star with X-ray double flares disguised as an ultra-luminous X-ray source

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

Research in Astronomy and Astrophysics 2016年第2期16卷 119-126页

作者： Jin-Cheng Guo Ji-feng Liu song Wang yue Wu yu-Xiang Qin Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100012China University of Chinese Academy of Sciences Beijing 100049China School of Physics The University of MelbourneParkvilleVictoria 3010Australia

Here we present research on an ultra-luminous X-ray source （ULX） candidate 2XMM J 140229.91＋542118.8. The X-ray light curves of this ULX candidate in M 101 exhibit features of a flare star. More importantly, the Chandra light curve displays unusual X-ray double flares, which is comprised of two close peaks. The X-ray （0.3-11.0 keV） flux of the first peak was derived from the two-temperature APEC model as ～ 1.1 ±0.1× 10-12 ergcm-2 s-1. The observed flux at its first peak increased by about two orders of magnitude in X-ray as compared to quiescence. The slope of the second fast decay phase is steeper than the slope of the first fast decay phase, indicating that the appearance of a second flare accelerated the cooling of the first flare in a way we do not understand yet. We also observed its optical counterpart using a 2.16 m telescope administered by National Astronomical Observatories, Chinese Academy of Sciences. By optical spectral fitting, it is confirmed to be a late type dMe2.5 star. According to the spectral type and apparent magnitude of its optical counterpart, we estimate the photometric distance to be ～ 133.4 ±14.2 pc. According to the X-ray spectral fitting, a possible explanation is provided. However, more similar close double flares are needed to confirm whether this accelerated cooling event is a unique coincidence or a common physical process during double flaring.

关键词： stars flare -- X-ray stars -- galaxies individual (M101)

Research on carbon emissions in China's export trade based on input-output model

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Population,Resources and Environment 2013年第1期11卷 1-9页

作者： Zongxian feng Jinjun Xue yu'e song School of Economics and Finance Xi'an Jiaotong University Nagoya University Nagoya 464-8601Japan

Becoming the world's largest emitter of carbon makes China the object of criticism;however,people may ignore the fact that when China exports low-carbon products,the carbon emissions have been left in the meanwhile,forming the so-called"embodied carbon".Using the input-output model,this paper analyzes the carbon emission intensity and amount of embodied carbon of various sectors in China's export trade in 2002 and 2007,and filters out high carbon emission *** addition,this paper also points out the problem of carbon emissions'international transfer from developed countries to China through the analysis of national and regional flow of export carbon emissions and changing of the proportion of emissions for exports relative to total emissions,and explains the reason that caused carbon transfer to China by using the treadmill of production *** on that,this paper proposes some measures for carbon reduction in China from the foreign trade perspective.

关键词： export trade embodied carbon input-output high carbon transfer treadmill of production theory

Basic mechanisms of peripheral nerve injury and treatment via electrical stimulation

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2022年第10期17卷 2185-2193页

作者： Xiao-Lei Chu Xi-Zi song Qi Li yu-Ru Li feng He Xiao-song Gu Dong Ming Academy of Medical Engineering and Translational Medicine Tianjin UniversityTianjinChina Department of Rehabilitation Tianjin HospitalTianjinChina College of Exercise&Health Sciences Tianjin University of SportTianjinChina College of Precision Instruments&Optoelectronics Engineering Tianjin UniversityTianjinChina

Previous studies on the mechanisms of peripheral nerve injury(PNI)have mainly focused on the pathophysiological changes within a single injury ***,recent studies have indicated that within the central nervous system,PNI can lead to changes in both injury sites and target organs at the cellular and molecular ***,the basic mechanisms of PNI have not been comprehensively *** electrical stimulation was found to promote axonal regeneration and functional rehabilitation after PNI,as well as to alleviate neuropathic pain,the specific mechanisms of successful PNI treatment are *** summarize and discuss the basic mechanisms of PNI and of treatment via electrical *** PNI,activity in the central nervous system(spinal cord)is altered,which can limit regeneration of the damaged *** example,cell apoptosis and synaptic stripping in the anterior horn of the spinal cord can reduce the speed of nerve *** pathological changes in the posterior horn of the spinal cord can modulate sensory abnormalities after *** can be observed in cases of ectopic discharge of the dorsal root ganglion leading to increased pain signal *** injured site of the peripheral nerve is also an important factor affecting post-PNI *** PNI,the proximal end of the injured site sends out axial buds to innervate both the skin and muscle at the injury site.A slow speed of axon regeneration leads to low nerve ***,it can take a long time for the proximal nerve to reinnervate the skin and muscle at the injured *** the perspective of target organs,long-term denervation can cause atrophy of the corresponding skeletal muscle,which leads to abnormal sensory perception and hyperalgesia,and finally,the loss of target organ *** mechanisms underlying the use of electrical stimulation to treat PNI include the inhibition of synaptic stripping,addressing the excessive excitability of the dorsal r

关键词： axonal transport brain-derived neurotrophic factor dorsal horn stimulation dorsal root ganglion stimulation electrical stimulation nerve regeneration neuropathic pain peripheral nerve injury spinal cord dorsal stimulation

Synthesis of a dendritic estrogen cluster:A potential tool for studies of nuclear versus extranuclear pathways of estrogen actions

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2012年第12期23卷 1319-1322页

作者： Jian Chen Hu Zheng Yan song yu feng Liang Qing Rong Qi Functional Food(Drug) Laboratory Institute of Agro-Product Processing Science and TechnologySichuan Academy of Agricultural Science Key Laboratory of Drug-Targeting and Drug-Delivery Systems of the Ministry of Education Department of Medicinal ChemistryWest China School of PharmacySichuan University

A novel estrogen dendrimer has been synthesized through a combination of divergent and convergent approaches in 9 practical steps and in good yields. It was characterized and confirmed by elemental analysis, FT-IR, MS, 1H NMR, 13C NMR. The dendrimer contains 16 estrone units and is potentially a useful tool for the studies of estrogen actions.

关键词： Estrogen dendrimer Synthesis Nuclear and extranuclear Receptor

Hydrothermal Synthesis and Structural Characterization of Three-dimensional Metal-organic Framework [Zn_3(C_2H_2N_3)_2(C_7H_5O_2)_4]

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2009年第1期25卷 1-4页

作者： song Zhe LI Guang-hua yu Yang SHI Zhan feng Shou-hua College of Chemistry State Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jilin University Changchun 130012 P. R. China

Hydrothermal reaction between mixed ligand（1,2,4-triazole and benzoic acid） and Zn（NO3）2·6H2O afforded a three-dimensional（3D） metal-organic framework Zn3（C2H2N3）2（C7H5O2）4（C2H2N3=1,2,4-triazole, C7H5O2=benzoic acid）. The compound was crystallized in the hexagonal system with space group R3： a=2.90234（9） nm, b=2.90234（9） nm, c=1.08597（5） nm, γ=120°, V=7.9222（5） nm^3, Mr=816.68, Dc=1.541 g/cm^3, Z=9, F（000）=3708, R=0.0636, and wR=0. 1777. Its structure consists of ZnN2O2 tetrahedron and ZnN204 octahedron, which are connected by 1,2,4-triazole and benzoic acid ligands to form a 3D framework with helical units. This compound forms an interpenetrated NbO topology. The compound was characterized by single-crystal X-ray diffraction, elemental analysis, FTIR spectra, and TGA measurements.

关键词： Hydrothermal synthesis Metal-organic framework 1,2,4-Triazole Benzoic acid Helical units