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Simultaneous determination of 15 nucleosides and nucleobases in natural Cordyceps by hydrophilic interaction chromatography- electrospray ionization tandem mass spectrometry

Simultaneous determination of 15 nucleosides and nucleobases...

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中华中医药学会中药分析分会第五届学术交流会

作者： Xiao Wang~(1,2.,Hengqiang Zhao~1,Hongmei Li~2.Bin Yang~2.Hongjun Yang~2.Luqi Huang~(2.) (1 Shandong Analysis and Test Center,Shandong academy of sciences,Jinan 2.001{2.China 2.institute of chinese Material Medical,China academy of chinese Medical sciences,16 Dongzhimennei Street,beijing 100700, China)

Cordyceps sinensis has been widely used as traditional chinese medicines(TCM) in *** date,nucleosides are believed to be the bioactive components in ***,a specific and sensitive analysis method of these compounds is essential for the quality control of *** interaction liquid chromatography(HILIC) was proposed for the separation of highly hydrophilic compounds by Alpert in 1990,which was characterized by polar stationary phases and aqueous-organic mobile *** mass spectrometry could provides low limits of detection and high selectivity capabilities, so the HILIC-ESI-MS/MS method would be more suitable for the quantitative analysis of high polar compound in complex *** this study,a hydrophilic interaction chromatography(HILIC) and electrospray ionization tandem mass spectrometry(ESI -MS/MS) method was developed for the identification and quantification of 15 nucleosides and nucleobases namely thymine,uracil, thymidine,2.-deoxyuridine,cordycepin,uridine,hypoxanthine,adenine,adenosine,xanthine,inosine,cytosine,guanine, cytidine,guanosine in natural *** separation was achieved on a Waters Xbridge Amide column(2.0x4.6 mm I.D.,3.5 um) and gradient elution using a solution of acetonitrile and buffer(0.2.%acetic acid and 10 mmol/L ammonium acetate) as the mobile phase at a flow rate of 0.8 mL/*** of the 16 target nucleosides and nucleobases was based on retention time, UV spectra,mass measurements of the protonated molecules([M+H]) and main fragment ions(ESI-MS/MS).Quantitative analysis of investigated compounds were performed using time programmed selective ion monitoring(SIM) or multiple reaction monitoring (MRM) in positive ion mode under optimized mass *** calibration curves showed good linearity(r > 0.9951) within the test *** overall intra- and inter-day RSD ranged from 2.4. to 5.2.%and from 3.2. to 6.73%,*** LOD were in the range of 0.15-10.00 ng/mL,respective

关键词： Cordyceps nucleosides and nucleobases hydrophilic interaction chromatography electrospray ionization tandem mass spectrometry

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Freestanding single-walled carbon nanotube bundle networks:Fabrication,properties and composites

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Science Bulletin 2012年第Z1期 205-224页

作者： ZHOU WeiYa*,MA WenJun,NIU ZhiQiang,SONG Li & XIE SiShen* beijing National Laboratory for Condensed Matter Physics,institute of Physics,{2. academy of {4.,beijing 100190,China

As a type of thin film,two dimensional(2.) reticulate architectures built of freestanding single-walled carbon nanotube(SWCNT) bundles are suitable for scalable integration into devices and nanocomposites for many *** superior properties of these films,such as optical transparency,unique electrical properties and mechanical flexibility,result not only from the outstanding properties of individual SWCNTs but also from the collective behavior of the individual tubes,with additional properties arising from the tube-tube *** this review,the synthesis,structure and fundamental properties,such as conductivity,transparency,optical nonlinearity and mechanical performance,of "freestanding SWCNT bundle network" thin films and nanocomposites,as well as their application as supercapacitors are *** long-standing problems and topics warranting further investigation in the near future are addressed.

关键词： single-walled carbon nanotube(SWCNT) SWCNT bundle network nanocomposites multifunctional thin film supercapacitors

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Precambrian tectonic evolution of the North China Craton

Precambrian tectonic evolution of the North China Craton

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中国科学院地质与地球物理研究所2.04.术年会

作者： MINGGUO ZHAI Key Laboratory of Mineral Resources,institute of Geology & Geophysics,chinese {2. of sciences,{4.,10002.,China

The North China Craton(NCC) is a major Archaean craton,covering an area of c.300 000 km in north and northeast *** all Archaean rocks on the craton experienced high-grade metamorphism and strong migmatization,so that the preserved greenstone belts underwent granulite-amphibolite-facies metamorphism,anatectic melting and strong *** suggests that the NCC may have a more complicated early tectonic history than most other cratonic *** oldest NCC rocks are 3.8 Ga granitic gneisses in NE China and supracrustal rocks in eastern *** continental growth occurred at 2.9- 2.7 *** subsequent high-grade metamorphic events occurred at 2.6-2.4. Ga(’2.5 Ga event’) and 1.9-1.75 Ga(’1.8 Ga event’).The older episode is considered to mark an amalgamation event,whereas the 1.8 Ga event represents the final cratonization of the NCC. Some researchers have divided the 1.8 Ga event into a 1.9-1.8 Ga metamorphic event(interpreted as a continent-continent collision) followed by a 1.8-1.65 Ga rifting *** workers have suggested that the metamorphism and rifting could be parts of a single tectonic event related to Palaeo-Mesoproterozoic mantle *** general consensus on the NCC for the period 2.5-1.8 Ga is that the craton was then in an inactive ***, in this paper it is proposed that several Palaeoproterozoic mobile belts existed(showing many of the characteristics of Phanerozoic orogens).During the Mesoproterozoic-Neoproterozoic, a set of sedimentary sequences(the Changcheng-Jixian-Qingbaikou systems) constituted a disconformable-pseudoconformable succession within an intra-cratonic aulacogen. The signature of a 1.4.0.9 Ga orogen and the Rodinia breakup is very weak,indicating that the NCC did not experience major deformation as it was amalgamated into the Rodinia supercontinent.

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STRUCTURE AND MAGNETIC PROPERTIES OF YFe_(12.x)Ti_x COMPOUNDS

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Acta Metallurgica Sinica(English Letters) 2001年第3期14卷 171-176页

作者： B. Fuquan, J.L. Wang, N. Tang, W.Q. Wang, Z.Z. Guo, G.H. Wu and F.M. Yang (State Key Laboratory of Magnetism, institute of Physics, The chinese {2. of sciences, {4. 100080, China) (Department of Physics, Inner Mongolia Normal University, Huhhot 01 State Key Lab. of Magnetism Inst. of Phys. Chinese Acad. of Sci. Beijing 100080 China

The structure and magnetic properties of the YFe12.xTix compounds (x=0.85, 1.00, 1.10, 1.2. and 1.30) have been investigated. Both the thermomagnetic analysis and X-ray diffraction patterns show that all compounds studied are almost single phase and crystallize in the ThMn12.type structure. The lattice parameters a, c and unit cell volume V increase monotonously with the increase of Ti content. Curie temperature Tc is almost independent on the Ti content while the spontaneous magnetization M0, the anisotropy field Ba and the anisotropy constant K1 decrease monotonously with the increase of Ti content and the temperature increases from 1.5 K to 2.3 K.

关键词： Iron Magnetic properties Structure (composition) Titanium Yttrium

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Conjugated Polymers as Multifunctional Biomedical Platforms:Anticancer Activity and Apoptosis Imaging

Conjugated Polymers as Multifunctional Biomedical Platforms:...

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第一届全国生物物理化学会议暨生物物理化学发展战略研讨会

作者： Libing Liu,Shu Wang~* beijing National Laboratory for Molecular sciences,and Key Laboratory of Organic Solids,{2. of Chemistry,chinese {4. of sciences,beijing 100190,China

＜正＞Conjugated polymers（CPs） have established themselves as useful components in optoelectronic devices as diverse as light-emitting diodes,field effect transistors, photovoltaic cells and organic semiconductor **... 详细信息

关键词： Conjugated polymers anticancer activity apoptosis imaging

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DISTRIBUTION CHARACTERISTICS OF AGERATINA ADENOPHORA (COMPOSITAE) ROOTS IN DIFFERENT INVADED AREAS

DISTRIBUTION CHARACTERISTICS OF AGERATINA ADENOPHORA (COMPOS...

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International Congress on Biological Invasions

作者： Fu-Rong GUI~(1,2.,Wan-Xue LIU~2.and Fang-Hao WAN~2.1 Key Laboratory for Agricultural Biodiversity and Pest Management of Ministry of Education, Plant Protection College,Yunnan Agricultural University,Kunming 6502.1,China 2.State Key Laboratory for Biology of Plant Diseases and Insect Pests,institute of Plant Protection,chinese {2. of Agricultural sciences,{4.,100081,China

The Crofton weed Ageratina adenophora(Spreng.) King & Robinson is a global worst invasive weed,it rapidly became the dominant flora in the invaded areas,where it threatened the native biodiversity and ecosystem,and caused serious economic *** present paper investigated and compared the distribution of A. adenophora roots in newly,moderate and heavily invaded areas,the objective is to find the distribution characteristics of roots in different invaded areas of ***. The results showed that,the mean root length density(RLD) of *** increasing following with its invading *** with moderate and heavily invaded areas of ***,roots system in newly invaded area is obviously under developed,their mainly exist during 0-10cm depth soil,and the mean RLD in this area visibly less than the above two invaded areas(p2.cm depth in the newly invaded areas is evidently lower than that of moderate and heavily invaded areas.

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What drove late Mesozoic extension of the northern China-Mongolia tract?

What drove late Mesozoic extension of the northern China-Mon...

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中国科学院地质与地球物理研究所2.03学术年会

作者： Qing-Ren Meng~* institute of Geology and Geophysics,chinese {2. of sciences,PO Box 982.,{4. 10002.,China

The northern China-Mongolia tract exhibited a tectonic transition from contractional to extensional deformation in late Mesozoic *** Middle to early Late Jurassic crustal shortening is widely thought to have resulted from collision of an amalgamated North China-Mongolia block and the Siberian plate,but widespread late Late Jurassic-Early Cretaceous extension has not been satisfactorily explained by existing *** prominent features of the extensional tectonics of the northern China-Mongolia tract are:(1) Late Jurassic voluminous volcanism prior to Early Cretaceous large-magnitude rapid extension;(2. overlapping in time of contractional deformation in the Yinshan-Yanshan belt with development of extension-related basins in the interior of the northern China-Mongolia tract;and(3) widespread occurrence of alkali granitic plutonism. extensional basins and metamorphic core complexes in the Early Cretaceous.A new explanation is advanced in this study for this sequence of *** collision of amalgamated North China-Mongolia with Siberia led to crustal overthickening of the northern China-Mongolia tract and formation of a high-standing *** breakoff at depth of the north-dipping Mongol-Okhotsk oceanic slab is suggested as the main trigger for late Mesozoic lithospheric extension of that *** breakoff resulted in mantle lithospheric stretching of the adjacent northern China-Mongolia tract with subsequent ascent of hot asthenosphere and magmatic underplating at the base of the ***,these phenomena triggered gravitational collapse of the previously thickened crust,leading to late Late Jurassic-Early Cretaceous crustal extension,and importantly, coeval contraction along the southern margin of the plateau in the Yinshan-Yanshan *** proposed model provides a framework for interpreting the spatial and temporal relationships of distinct processes and reconciling some seemingly contradictory phenomena,such as the synchronous ext

关键词： Crustal extension Gravitational collapse Yinshan Daqing Shan Northern China and Mongolia

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Symmetry of Y_5 Deformation and Two-Level Model

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chinese journal of nuclear physics 1994年第4期 337-343页

作者： Zhang Xi-zhen~(1,2. Dong Bao-guo~(1)(1 China institute of Atomic Energy,P.O.Box 2.5(18),beijing 102.2.3)(2.institute of Theoretical Physics,chinese {{2. of Science,beijing 100080)

The symmetry of Y5μ-deformed fields are classified and the one-particlespectra in two-level model coupled by Y5μ fields are discussed.

关键词： Y5μ-deformed clusters Two-level model Single particle

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Study on the Ultrastructures of Antennal Sensilla in Helicoverpa armigera

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Agricultural sciences in China 2002年第8期1卷 896-899页

作者： WANG Gui-rong, GUO Yu-yuan and WU Kong-ming( State Key Laboratory of Plant Disease and Insect Pests, The institute of Plant Protection , chinese {2. of Agricultural sciences, {4. 100094., P. R . China ) State Key Laboratory of Plant Disease and Insect Pests The Institute of Plant Protection Chinese Academy of Agricultural Sciences Beijing 100094 P. R . China

The morphology and structures of antennal sensilla of Helicoverpa armigera are observed under scanning and transmission electron microscopes. Antennae of Helicoverpa armigera are made up of scapus, pedicel and flagellum that the latter consists of 70 - 82.segments. The inner side surface of antenna is cat-aphracted and most of the antennal sensilla lie on its outer, upper and lower surfaces. Both the antennae of male and female contain five kinds of antennal sensilla, namely, sensillum trichodeum, sensillum basicon-icum, sensillum chaeticum, ear-shaped sensillum and sensillum coeloconicum, and the kinds, number and distribution of antennal sensilla of both sexes are similar. There are a large number of serrate cuticular processes on antennal surface, especially on the middle and basic parts of antenna. Sensillum trichodeum and sensillum basiconicum, the main chemical odor receptors on antennae of Helicoverpa armigera, consist of cuticular-wall, sheath cells, lymph and dendrites. There are significant differences between the internal structures of the two kinds of sensilla. In sensillum trichodeum, the cuticular-wall is thicker, less lipophilic pore channels and has one or a few dendrites, while in sensillum basiconicum, the cuticular-wall is thinner, abundant lipophilic pore channels and has much more dendrites.

关键词： Helicoverpa armigera Antennal sensillum Ultrastructures Scanning electron microscope Transmission electron microscope

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高度集约化利用下蔬菜地土壤酸化及次生盐渍化研究——以南京市南郊为例

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土壤 2005年第5期37卷 530-533页

作者：王辉董元华安琼孙红霞中国科学院南京土壤研究所南京210008 南京市雨花台区农业局南京210012

本文研究了在目前农田大量施用化肥及有机肥的情况下南京市南郊蔬菜地土壤pH和盐分含量的变化.研究结果表明:在露天农田土壤pH略有上升的基础上,南京市南郊大棚蔬菜地土壤的pH值比露天农田下降了约0.30～0.87,比第二次土壤普查时的露天... 详细信息

本文研究了在目前农田大量施用化肥及有机肥的情况下南京市南郊蔬菜地土壤pH和盐分含量的变化.研究结果表明:在露天农田土壤pH略有上升的基础上,南京市南郊大棚蔬菜地土壤的pH值比露天农田下降了约0.30～0.87,比第二次土壤普查时的露天蔬菜地下降了约0.12.0.52.同时,大棚蔬菜地土壤盐分累积也较为严重,主要表现为NO3-在土壤中的大量累积.

关键词：土壤pH 土壤盐分蔬菜地土壤南京南郊

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