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| 1 | Dynamics of Microbial Communities in Bulk and Developing CucumberRhizosphere Soil显示文摘The microbial population dynamics in bulk and developing cucumber rhizospheres were studiedby cultivation and cultivation-independent approach based on directly extracted DNA toprovide baseline data. Soil and rhizosphere samples were taken from tested field 2, 4, 7 and10 weeks after the seeds were planted, which was positively related to the corresponding dateof cucumber growth stages. The plate culture amount showed that total number of bacteria,fungi and actinomyces began to rise when cucumber planted and quickly reached peak at seedlingor blossom period, but decreased slightly later. Bacterial population in rhizosphere washigher by comparison with that of counterpart except for seedling and flowering stages, butthe shift trend of them were quite similar all the time. Nitrogen fixating, nitrobacter andammonifying bacteria showed the same change tendency in population as bacteria and actinomycesdid, however, cellulose-decomposing bacteria had the contrary rhizosphere effect as cucumberdeveloped. Data revealed that positive relevance existed between the dominant rhizospheremicrobe population and cucumber development. PCR was employed to amplify the V3 region of 16SrDNA, then the products were subjected to denaturing gradient gel electrophoresis(DGGE). DGGEprofile indicated that a few microbe species lived stable in farmland soil, but some wereinfluenced by population due to cucumber roots growth. Significant difference was observed inbulk and rhizosphere soils especially for the seedling and flowering samples. Few prominentbands in DGGE patterns, which displayed stronger or less illumination, means the representativebacteria had great population variation in that period. These phenomena indicated thatflowering cucumber heavily affected rhizosphere bacteria, or the bacteria, most probably theuncultured bacteria, functioned specially to cucumber blossom. Most detected bands with noillumination change in DGGE quite possibly represent the indigenous microbes that wereessential for constructing and stabilizing farmland microecological environment. | HUYuan-sen WUKun LIUNa CHENHong-ge JIAXin-cheng | 2004 | Agricultural Sciences in China2004，3，5： | 15 |
| 2 | The signal transduction pathways and molecules for ES cells self-renewal显示文摘Embryonic stem cells (ES cells) are derived from the inner cell mass (ICM) of blastocysts. ES cells can divide and produce identical copies of them over and over again (self-renewal) in vitro for a long time, and retain the capability of differentiating into all cell types when induced by appropriate signals. Their capability of multilineage dif- ferentiation might be exploited for cell-based therapies. Therefore, ES cells have a broad prospect in many clinical applications. To achieve success in the clinical applications, we have to understand how ES cells propagate and differen- tiate into specific cell types. The cytokine LIF can sustain the self-renewal of certain mouse ES cells (mES cells) through activation of the signal transduction pathway LIF/gp130/ STAT3. In this pathway the transcription factor STAT3 is a crucial factor. Furthermore, Oct-3/4 plays a very important role in maintaining the ES cell pluripotency. Oct-3/4 regu- lates embryo development through its co-factor Sox2 and Rox-1. Recently nanog, a new homeodomain gene, was found and it has been shown to be crucial for the renewal and pluripotency of ES cells. Three other signals BMP, Wnt and ERK also can influence differentiation and propagation of ES cells. This review article summarizes recent progress in this area, mainly focusing on the LIF signaling pathway and the transcription factors Oct-3/4 and Nanog. Although it is still unclear how these components cooperate, a model is presented here to provide a design for solving this problem. | LIUNa LUMin | 2005 | Chinese Science Bulletin2005，50，8： | 7 |
| 3 | 显示文摘 | ZHANGLei LIUNa KANGPing-li etal(张蕾 刘娜 康平利 等) | 2009 | 化学通报2009，73，11： | 1 |
| 4 | Microstructure evolution of SiC p /ZM6 (Mg–Nd–Zn) magnesium matrix composite in the semi-solid state显示文摘 | Qiang Chen Gang Chen Liuna Han Nan Hu Fei Han Zude Zhao Xiangsheng Xia Yuanyuan Wan | 2016 | Journal of Alloys and Compounds2016，，： | 1 |
| 5 | CORRELATION BETWEEN ASO AND AAO显示文摘Using a 34 years database consisting of sea level pressure and sea ice concentration, the relationship between Antarctic Oscillation (AAO) and Antarctic Sea-ice Oscillation (ASO) was investigated. Firstly, Empirical Orthogonal Function (EOF) analysis depicts the spatial variability of AAO and ASO and Antarctic Sea-ice Oscillation Index (ASOI) was defined for the first time. Secondly, power spectrum and head-lag correlation analysis show that ASO and AAO have the same periods of quasi-three years, quasi-one year and quasi-half a year. Corresponding to AAO, ASO has an evident anti-oscillation after one and half a year. | LIUNa ZHANGQing-hua CHENHong-xia | 2004 | Journal of Hydrodynamics2004，16，5： | 0 |
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