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柯尼希定理在杆组问题中的应用探讨
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作者 贾拴稳 《安阳师范学院学报》 2007年第5期30-32,共3页
本文讨论了在杆组系统中应如何正确地运用柯尼希定理求解系统的动能,进而求解杆组系统的运动问题.
关键词 杆组系统 柯尼希定理 质心运动定理
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Comparative genomics of Helicobacter pylori 被引量:2
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作者 Quan-Jiang Dong Qing Wang Ying-Nin Xin Ni Li Shi-Ying Xuan 《World Journal of Gastroenterology》 SCIE CAS CSCD 2009年第32期3984-3991,共8页
Genomic sequences have been determined for a number of strains of Helicobacter pylori (H pylori) and related bacteria. With the development of microarray analysis and the wide use of subtractive hybridization techni... Genomic sequences have been determined for a number of strains of Helicobacter pylori (H pylori) and related bacteria. With the development of microarray analysis and the wide use of subtractive hybridization techniques, comparative studies have been carried out with respect to the interstrain differences between H pylori and inter-species differences in the genome of related bacteria. It was found that the core genome of H pylori constitutes 1111 genes that are determinants of the species properties. A great pool of auxiliary genes are mainly from the categories of cag pathogenicity islands, outer membrane proteins, restriction-modification system and hypothetical proteins of unknown function. Persistence of H pylori in the human stomach leads to the diversification of the genome. Comparative genomics suggest that a host jump has occurs from humans to felines. Candidate genes specific for the development of the gastric diseases were identified. With the aid of proteomics, population genetics and other molecular methods, future comparative genomic studies would dramatically promote our understanding of the evolution, pathogenesis and microbiology of Hpylori. 展开更多
关键词 HELICOBACTERPYLORI GENOMICS PATHOGENESIS CANCER
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Expression of Rice Gall Dwarf Virus Outer Coat Protein Gene (S8) in Insect Cells
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作者 Guo-cheng FAN Fang-luan GAO +5 位作者 Tai-yun WEI Mei-ying HUANG Li-yan XIE Zu-jian WU Qi-ying LIN Lian-hui XIE 《Virologica Sinica》 SCIE CAS CSCD 2010年第6期401-408,共8页
To obtain the P8 protein of Rice gall dwarf virus (RGDV) with biological activity,its outer coat protein gene S8 was expressed in Spodoptera frugiperda (Sf9) insect cells using the baculovirus expression system.The S8... To obtain the P8 protein of Rice gall dwarf virus (RGDV) with biological activity,its outer coat protein gene S8 was expressed in Spodoptera frugiperda (Sf9) insect cells using the baculovirus expression system.The S8 gene was subcloned into the pFastBacTM1 vector,to produce the recombinant baculovirus transfer vector pFB-S8.After transformation,pFB-S8 was introduced into the competent cells (E.coli DH10Bac) containing a shuttle vector,Bacmid,generating the recombinant bacmid rbpFB-S8.After being infected by recombinant baculovirus rvpFB-S8 at different multiplicities of infection,Sf9 cells were collected at different times and analyzed by SDS-PAGE,Western blotting and immunofluorescence microscopy.The expression level of the P8 protein was highest between 48-72 h after transfection of Sf9 cells.Immunofluorescence microscopy showed that P8 protein of RGDV formed punctate structures in the cytoplasm of Sf9 cells. 展开更多
关键词 Rice gall dwarf virus (RGDV) Outer coat protein Baculovirus expression system Spodoptera frugiperda (Sf9) insect cells
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