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101.
GAO Lei * QI Ji * WEI Haibin * SUN Yigang & HAO Bailin . Institute of Theoretical Physics Chinese Academy of Sciences Bei-jing China . T-Life Research Center Fudan University Shanghai China . Graduate School Zhejiang University Hangzhou China . Hangzhou Branch Beijing Genomics Institute Chinese Academy of Sciences Hangzhou China Correspondence should be addressed to Hao Baibin 《科学通报(英文版)》2003,48(12):1170-1174
The outbreak of SARS sets an urgent task to reveal the origin of human SARS-CoV, i.e. its relation to other known species of coronavirus, and to trace the genetic variation in the spreading process of SARS. Partial answer to the problem may be obtained from phylogenetic analy-sis of available genomes. We call a phylogenetic tree of different species of coronavirus including the human SARS-Cov a CoV Tree and that of different isolates of SARS-CoV a SARS Tree. CoV trees have been c… 相似文献
102.
在常用的计算时间阈值识别方法的基础上,提出了一种改进的基于 URL 页面类型、页面信息量和访问时间的平均阈值识别方法.针对不同的页面类型采用不同的阈值计算方法设置时间阈值,相对于已有的对所有用户页面使用单一的先验阈值和现有动态阈值计算,该方法能够更真实地反映用户会话的情况,且识别的准确率有了较大提高. 相似文献
103.
Involvement of Jasmonate-signaling pathway in the herbivore-induced rice plant defense 总被引:8,自引:0,他引:8
XU Tao* ZHOU Qiang* CHEN Wei ZHANG Guren HE Guofeng GU Dexiang & ZHANG Wenqing State Key Laboratory for Biocontrol & Institute of Entomology Sun Yat-set 《科学通报(英文版)》2003,48(18):1982-1987
The expression patterns of eight defense- related genes in the herbivore-infested and jasmonate- treated (jasmonic acid, JA and its derivative MeJA) rice leaves were analyzed using RT-PCR. The results showed that Spodoptera litura Fabricius (Lepidoptera: Noctuidae) herbi-vory induced the expression of lipoxygenase (LOX) and al-lene oxide synthase (AOS) genes that are involved in the jasmonate-signaling pathway. Moreover, S. litura damage resulted in the expression of farnesyl pyrophosphate syn-thase (FPS), Bowman-birk proteinase inhibitor (BBPI), phenylalanine ammonia-lyase (PAL) and other rice defense- related genes that were also induced by aqueous JA treat-ment or gaseous MeJA treatment. These indicated that in rice leaves, the JA-related signaling pathway was involved in the S. litura-induced chemical defense. Mechanical damage and brown planthopper (BPH), Nilaparvata lugens (St錶) (Homoptera: Delphacidae) damage induced the expression of LOX gene, but both treatments did not induce the expression of AOS gene. However, BPH damage induced the expression of acidic pathogen-related protein 1 (PR-1a), Chitinase (PR-3), and PAL genes, which is involved in the salicylate- signaling pathway. It was suggested that salicylate-related signaling pathway or other pathways, rather than jas-monate-signaling pathway was involved in the BPH-induced rice plant defense. 相似文献
104.
TIE Yi HU Zheng Lü GuiXiang FU HanJiang XING RuiYun ZHU Jie SUN ZhiXian & ZHENG XiaoFei * Department of Biochemistry Molecular Biology Beijing Institute of Radiation Medicine Beijing China Department of Biochemistry Molecular Biology Basic Medical Science College Harbin Medical University Harbin China Received June accepted August 《科学通报(英文版)》2011,56(30):3172-3177
Ionizing radiation (IR) causes severe cellular damage both directly and indirectly and disrupts RNA integrity. RNA strand breaks are the most frequent type of damage caused by IR. RNA damage is involved in the development of degenerative diseases, including Alzheimer’s disease and Parkinson’s disease. However, the mechanism of mRNA damage and any resulting pathophysiological outcomes are poorly understood. This is partly because there is a lack of sensitive tools to monitor damage randomly occurring in RNA,... 相似文献
105.
LI DeSheng~ CUI HengMin~ WANG ChengDong~ LING ShanShan~ HUANG Zhi~ & ZHANG HeMin* China Research Conservation Center for the Giant P a Ya’an China Medical College of Animal Sichuan Agricultural University Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education State Conservation Center for Gene Re- sources of Endangered Wildlife Hangzhou 《科学通报(英文版)》2011,56(24):2559-2564
Captive populations provide a precious genetic resource for endangered animals and a source of individuals for reintroduction to depleted habitats. Therefore, accuracy in determining paternity is of vital importance for managing captive populations and in selecting representative individuals of known genetic characteristics for release. In this study, we established a fast and effective method to conduct paternity testing for captive giant pandas in the Wolong population. This technique uses two highly poly... 相似文献
106.
介绍了在室温下设计合成的一种功能化离子液体1,2-二甲基-3-丁基咪唑硫酸氢盐离子液体[mmBim][HSO4]均为在不同温度下测定了该离子液体的密度、表面张力、粘度和电导率等性质,并根据特定的经验方程,估算了该离子液体的热膨胀系数、标准熵和晶格能等性质参数,为该离子液体的预期应用提供了重要的数据参考. 相似文献
107.