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Search Results: 1 - 10 of 332362 matches for " <br>武春霞 "
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Research developments for the applications of carbon nanotubes in separation science
碳纳米管在分离科学中的应用研究进展

WU Chunxia,WANG Chun,WANG Zhi,<br>,,王志
色谱 , 2011,
Abstract: As a novel nanomaterial, carbon nanotubes (CNTs) have been extensively applied in many fields such as material, catalysis, adsorption and separation, etc. The applications of CNTs in separation science, such as in solid phase extraction (SPE), solid phase microextraction (SPME) and membrane extraction, and as stationary phase for chromatographic separation and capillary electrophoresis (CE) are reviewed in the paper.
IL-6通过活化STAT3/Notch信号促进癌相关成纤维细胞衰老及宫颈癌上皮细胞侵袭与放疗抵抗的机理研究
Mechanistic study of cancer-associated fibroblast senescence and cervical cancer cell invasiveness and radio-resistance conferred by IL-6 through activation of STAT3 and Notch signaling

,马锦琪,吕祝,等<br>REN Chunxia, MA Jinqi, Lü Zhuwu, et al
- , 2016, DOI: 10.19401/j.cnki.1007-3639.2016.12.001
Abstract: 背景与目的:肿瘤微环境中衰老的癌相关成纤维细胞(cancer-associated fibroblasts,CAFs)介导上皮肿瘤的转移和放化疗抵抗,而CAFs分泌的炎性细胞因子IL-6可能促进宫颈癌的侵袭和放疗抵抗,但其作用机制并不清楚。该研究旨在探讨IL-6对CAFs衰老及宫颈癌上皮细胞侵袭与放疗抵抗的作用。方法:以宫颈癌CAFs、宫颈组织正常成纤维细胞(normal fibroblasts,NFs)、宫颈癌细胞系HeLa、Siha和ME180为材料,采用IL-6、STAT3和Notch抑制剂处理不同细胞,用细胞染色、免疫荧光、蛋白[质]印迹法(Western blot)和流式细胞术等方法测定细胞衰老、STAT3、Notch信号、细胞侵袭能力和对放射线诱导的细胞凋亡变化。结果:CAFs条件培养基(conditioned medium,CM)或IL-6可以激活STAT3和Notch信号诱导细胞衰老或促进宫颈癌细胞的侵袭能力;CAFs与宫颈癌细胞混合培养能促进宫颈癌细胞的侵袭,但IL-6抗体、STAT3抑制剂S31-201或Notch抑制剂DAPT处理细胞则会抑制宫颈癌细胞的侵袭。IL-6/STAT3作为Notch信号的上游分子,可能主要通过自分泌或旁分泌的方式上调成纤维细胞或癌细胞中Notch信号关键配体Jagged-1而活化Notch信号,最后赋予宫颈癌细胞对放射线的抵抗作用。结论:CAFs在肿瘤微环境中可能通过IL-6/STAT3活化Notch信号诱导宫颈癌上皮细胞的侵袭和放疗抵抗,靶向STAT3/Notch信号相关分子有可能提高宫颈癌的放疗效果。
Self-compression and splitting of laser pulse in plasmas
激光脉冲在等离子体中的压缩分裂

Luan Shi-Xi,Zhang Qiu-Ju,Wu Hui-Chun,Sheng Zheng-Ming,<br>栾仕,张秋菊,,盛政明
物理学报 , 2008,
Abstract: 通过数值求解一维非线性薛定谔方程,研究了圆偏振入射激光脉冲在初始密度范围为1/4到略低于1倍临界密度的等离子体中的自压缩和分裂现象. 提高等离子体密度和入射激光强度以及减小脉冲宽度可以在更短的传输距离获得有效的激光脉冲压缩,压缩后的脉冲半高宽度可达到初始脉冲半高宽度的1/35,甚至更小. 这种压缩是激光脉冲在等离子体中形成高阶孤子的过程中产生的,可以获得比在稀薄等离子体中更好的压缩比例. 数值计算的结果给出了该情况下激光脉冲在等离子体中自压缩后形成的高阶孤子分裂. 利用一维粒子数值模拟程序(particle-in-cell,PIC)也观察到了脉冲的压缩和分裂现象,得到了与数值计算一致的结果.
Interaction between fulvic acids of different origins and active oxygen radicals
WANG Chunxia WANG Zijian PENG AnHOU Jingwu XIN Wenjuan,<br>王,王子健,彭安,侯京,忻文娟
中国科学C辑(英文版) , 1996,
Abstract: Using the spin trapping technique, the interaction between fulvic acids (FAs) of different origins and the active oxygen radicals was studied. The active oxygen radicals under study included superoxide anion (O2 ·- ) produced by xanthine oxidase (XOD) and stimulated polymorphonuclear leukocytes (PMN) of human being and hydroxyl radical ( ·OH) produced from Fenton's reaction. It has been found that the FAs from both Kaschin-Beck disease (KBD) region and non-KBD region can accelerate the production of ·OH and scavenge O2 ·- . FA from peat can scavenge bothO2 ·- and ·OH. The results show that the behavior of KBD and non-KBD FAs differs clearly from peat FA. It has been concluded that the superoxidation damage of KBD induced by FA is mainly due to hydroxyl radical reaction initiated in biological system.
Phase Structure Transition and Optical Properties of MgxZn1-xO Alloy
MgxZn1-xO合金的相结构转变和光学性质

Wu Chunxia,Shen Dezhen,Fan Xiwu,Zhou Ming,Cai Lan,<br>吴,吕有明,申德振,范希,周明,蔡兰
半导体学报 , 2007,
Abstract: 利用等离子辅助分子束外延(P-MBE)技术,在蓝宝石c-平面上外延生长了MgxZn1-xO(0≤x≤0.65)合金薄膜,其x值分别为0,0.11,0.28,0.44,0.51和0.65.X射线衍射测量表明,随着x增加到0.28,只在2θ为34.46~34.67°的位置观察到(002)衍射峰,表明样品为单一六角纤锌矿结构的MgZnO合金.当x值增加到0.44时,观察到了MgxZn1-xO的相分离.当x值增加到0.65时,MgZnO合金完成了从单一六角纤锌矿结构向立方向结构的转变.通过对样品的光致发光谱、吸收谱的测量,详细研究了上述样品的相结构转变对其光学性质的影响.
pH-induced conformational transitions of bovine serum albumin investigated by ultraviolet derivative spectroscopy
导数紫外光谱法研究pH诱导牛血清蛋白构象变化

PENG Gang,LIU Bai-Ling,ZHAO Chun-Xia,JIANG Zheng-Wu,<br>彭钢,刘白玲,,江正
中国科学院研究生院学报 , 2011,
Abstract: The fine absorption bands of three aromatic amino acid residues,Tryptophan (Trp),Tyrosine (Tyr),and Phenylalanine (Phe),of bovine serum albumin (BSA) were studied by ultraviolet second derivative spectroscopy.The conformation transitions of BSA at pH 2.3-12 were analyzed along with the absorption spectrum of the peptide bonds.It is observed that there exist obvious conformation transitions around the isoelectric point (pH 4.7) of BSA.The transitions are subtle between pH 5.7 and pH 10 but distinct in strong acidity(pH 2.3) and alkaline(pH 12) environments. Meanwhile,the concentration of BSA has certain effect on the conformation transition.
一种基于AMPF和FastSLAM的复合SLAM算法
,,张浩峰
模式识别与人工智能 , 2009,
Abstract: 为了改进快速同时定位和地图创建(FastSLAM)算法的粒子集性能、提高估计精度,提出基于AMPF和FastSLAM的复合SLAM算法.将辅助边缘粒子滤波器(AMPF)与FastSLAM架构相结合,用AMPF估计机器人位姿,单个粒子的位姿提议分布用无轨迹卡尔曼滤波估计.设计与AMPF和FastSLAM架构均兼容的采样方法和粒子数据结构,在FastSLAM框架下用扩展卡尔曼滤波递归估计地图.实验表明,该算法的粒子集性能比FastSLAM2.0算法好,并且它的位姿估计精度高于FastSLAM2.0算法.此外,粒子数较少时,该算法的估计精度较高,从而可适当减少粒子数目来提高算法的计算效率.
动态联合最近邻算法
,,张浩峰
电子学报 , 2010,
Abstract: “最近邻算法”(NN)是SLAM领域中广泛使用的一种数据关联算法,它的优点是计算复杂度低,其缺点是关联准确度易受环境影响。为提高“最近邻算法”对环境的鲁棒性,对其进行两处改进:一是从所有观测值之间的相关性出发,消除所有观测值配对结果之间的干涉情况;二是采用多帧观测数据的关联结果动态滤除观测特征中的伪特征。此外,根据机器人的位姿和传感器的有效量程将数据关联限定在局部可能区域中,从而极大地提高了算法的计算效率。仿真和实际实验结果表明,提出的“动态联合最近邻算法”(DJNN)在准确度和计算复杂度方面的性能都很好,具有极强的应用价值。
Selection of benthic macroinvertebrate-based multimetrics and preliminary establishment of biocriteria for the bioassessment of the water quality of Taihu Lake, China
太湖水质评价中底栖动物综合生物指数的筛选及生物基准的确立

MA Tao-Wu,HUANG Qing-Hui,WANG Hai,WANG Zi-Jian,WANG Chun-Xia,HUANG Sheng-Biao,<br>马陶,黄清辉,王海,王子健,,黄圣彪
生态学报 , 2008,
Abstract: To develop benthic macroinvertebrate-based multimetrics for the bioassessment of the water quality of Taihu Lake, benthic macroinvertebrate assemblages were sampled at 60 sites in 8 subareas of Taihu Lake. A total of 24 species of benthic macroinvertebrates were obtained: 14 species of Mollusca, 5 species of Arthropoda and 5 species of Annelida. A comprehensive evaluation of the metrics was carried out. The results showed that 7 metrics (i.e., total number of taxa, the number of Mollusca & Crustacea taxa, % Mollusca & Crustacea, % Gastropoda, Goodnight-Whitley index, Hilsenhoff biotic index and % Collector-gatherers) were sensitive. A score of 5, 3 or 1 was assigned to every metric for standardization of the metrics, and a multimetric on a scale ranging from 7 to 35 for bioassessment was developed. Four-level discriminatory biocriteria for water quality were eventually proposed by quartation: 7–14, very poor; 15–21, poor; 22–28, fair; 29–35, good. The re-scored results from the 60 sites showed that the water quality of southeastern Taihu Lake was relatively good, whereas that of northwestern Taihu Lake was relatively poor. Basically, the discriminatory biocriteria are suitable for the assessment of the water quality of Taihu Lake.
4个树莓品种茎解剖结构与抗旱性的关系
The Relationship Between Stem Anatomical Structure and Drought Resistance in 4 Varieties of Raspberry

张般般,刘婷,杨静慧,刘艳军,,李冰<br>ZHANG Ban-ban,LIU Ting,YANG Jing-hui,LIU Yan-jun,WU Chun-xia,LI Bing
- , 2018, DOI: 10.13718/j.cnki.xdzk.2018.05.009
Abstract: 为了比较不同树莓品种的抗旱性,为抗旱树莓品种的选择和推广提供依据,采用徒手切片的方法,以树莓茎为试材,分析了4个树莓品种茎横切面木栓层、皮层、维管束和中柱等茎解剖结构.结果表明:凯欧的木栓层细胞壁最厚,且细胞层数最多,约5~6层;莎妮和海尔特兹的木栓层细胞壁较薄,细胞层分别为3~4层和3层;南方黑树莓木栓层细胞壁最薄,仅1~2层细胞.凯欧茎皮层厚度最大,为84.33 μm;其次是莎妮,茎皮层厚度为60.07 μm;南方黑树莓和海尔特兹的皮层厚度小于莎妮,分别为48.87 μm和48.57 μm.凯欧和莎妮中柱的髓占的比例较大,南方黑树莓茎中柱的髓占的比例较小.凯欧的维管束数量最多,为33束;其次是莎妮和海尔特兹,分别为31束和30束;南方黑树莓数量最少,为20束.木质部导管的数量凯欧最多,14~56个;海尔特兹次之,为12~40个;再次是莎妮,为5~35个;最少的是南方黑树莓,为4~26个.综合分析表明:4个树莓品种中凯欧的抗旱性最强,其次是莎妮,再次是南方黑树莓,海尔特兹的抗旱性最弱.
In order to provide a basis for the selection and popularization of drought resistant raspberry varieties, the cork, cortex, vascular bundle, column and other anatomical structures of the stem in four raspberry varieties differing in drought resistance (Kiowa, Heritage, Shawnee and Focke) were studied and compared with the hand-sliced method. The results showed that of the four varieties studied Kiowa had the thickest cell wall of the cork layers in the stem, with about 5-6 cell layers, the cell wall of Shawnee and Heritage was thinner, with 3 or 4 layers, and Focke had the thinnest cell wall in the cork, with only 1-2 layers. In the cortex thickness of the stem, Kiowa was the thickest (84.33 μm), followed by Shawnee (60.07 μm), Focke (48.87 μm) and Heritage (48.57 μm). The pith of Kiowa and Shawnee in the stele was larger than that of Focke. Kiowa had the greatest number of vascular bundles (33), followed in order by Shawnee (31), Heritage (30) and Focke (20). Kiowa, Heritage, Shawnee and Focke had 14 to 56, 12 to 40, 5 to 35 and 4 to 26 ducts in their xylem, respectively. In conclusion, the drought resistance of the four raspberry varieties was in the order of Kiowa, Shawnee, Focke, Heritage
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