共查询到20条相似文献，搜索用时 15 毫秒
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Lawler A 《Science (New York, N.Y.)》2004,305(5680):30-33
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小麦慢条锈性特点的研究 总被引：1，自引：1，他引：1
慢条锈性对于保持抗病稳定性和持久性具有重要意义。2003～2004年选用10个具有代表性的当地主栽冬小麦品种,在清水县进行慢条锈性研究。结果表明:里勃留拉、斯汤佩利和武都白茧为高度慢锈性品种;清农3号和咸农4号为中度慢锈性品种;兰天1号和清农1号为低度慢锈性品种;天选15和幅63为快锈性品种。慢锈性品种的抗病特点为潜育期长,反应型表现感病,普遍率低于50%或严重度低于25%,病情指数小于15%或终期病情指数小于60%,千粒重损失率低于9%或相对千粒重损失率低于40%。 相似文献
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Periodic slow earthquakes from the Cascadia subduction zone 总被引：1，自引：0，他引：1
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The slow, insidious natures of the HTLV's 总被引：1，自引：0，他引：1
J L Marx 《Science (New York, N.Y.)》1986,231(4737):450-451
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Stokstad E 《Science (New York, N.Y.)》2002,295(5564):2344-2345
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A flying start, then a slow slip 总被引：1，自引：0，他引：1
Bilham R 《Science (New York, N.Y.)》2005,308(5725):1126-1127
The human tragedy caused by the Sumatra-Andaman earthquake (moment magnitude 9.3) on 26 December 2004 and its companion Nias earthquake (moment magnitude 8.7) on 28 March 2005 is difficult to comprehend. These earthquakes, the largest in 40 years, have also left seismologists searching for the words and tools to describe the enormity of the geological processes involved. Four papers in this issue discuss aspects of a rupture process of surprising complexity, the first such event to test the sensitivity and range of many new technologies. A surprising feature of the earthquake is that after the initial rapid rupture, subsequent slip of the plate interface occurred with decreasing speed toward the north. 相似文献
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Infection-specific particle from the unconventional slow virus diseases 总被引：27，自引：0，他引：27
P A Merz R G Rohwer R Kascsak H M Wisniewski R A Somerville C J Gibbs D C Gajdusek 《Science (New York, N.Y.)》1984,225(4660):437-440
Scrapie-associated fibrils, first observed in brains of scrapie-infected mice, were also observed in scrapie-infected hamsters and monkeys, in humans with Creutzfeldt-Jakob disease, and in kuru-infected monkeys. These fibrils were not found in a comprehensive series of control brains from humans and animals affected with central nervous system disorders resulting in histopathologies, ultrastructural features, or disease symptoms similar to those of scrapie, kuru, and Creutzfeldt-Jakob disease. These fibrils are also found in preclinical scrapie and in the spleens of scrapie-infected mice; they are a specific marker for the "unconventional" slow virus diseases, and may be the etiological agent. 相似文献
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Some large earthquakes display low-frequency seismic anomalies that are best explained by episodes of slow, smooth deformation immediately before their high-frequency origin times. Analysis of the low-frequency spectra of 107 shallow-focus earthquakes revealed 20 events that had slow precursors (95 percent confidence level); 19 were slow earthquakes associated with the ocean ridge-transform system, and 1 was a slow earthquake on an intracontinental transform fault in the East African Rift system. These anomalous earthquakes appear to be compound events, each comprising one or more ordinary (fast) ruptures in the shallow seismogenic zone initiated by a precursory slow event in the adjacent or subjacent lithosphere. 相似文献
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R Gillette 《Science (New York, N.Y.)》1971,172(987):1011-1013