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研究超声波经过两个烧结样品的行为.两个烧结样品为有序的面心立方结构,它们的结构几乎相同.研究表明:在两个有序的准均匀的介质中分别有一个禁带区域.就禁带区域而言,在两个样品中产生禁带的区域非常接近.同时在禁带出现的区域群速度为负值.我们的结果表明群速度的负值的确存在于有序介质中的禁带区域内. 相似文献
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Autism Genome Project Consortium Szatmari P Paterson AD Zwaigenbaum L Roberts W Brian J Liu XQ Vincent JB Skaug JL Thompson AP Senman L Feuk L Qian C Bryson SE Jones MB Marshall CR Scherer SW Vieland VJ Bartlett C Mangin LV Goedken R Segre A Pericak-Vance MA Cuccaro ML Gilbert JR Wright HH Abramson RK Betancur C Bourgeron T Gillberg C Leboyer M Buxbaum JD Davis KL Hollander E Silverman JM Hallmayer J Lotspeich L Sutcliffe JS Haines JL Folstein SE Piven J Wassink TH Sheffield V Geschwind DH 《Nature genetics》2007,39(3):319-328
Autism spectrum disorders (ASDs) are common, heritable neurodevelopmental conditions. The genetic architecture of ASDs is complex, requiring large samples to overcome heterogeneity. Here we broaden coverage and sample size relative to other studies of ASDs by using Affymetrix 10K SNP arrays and 1,181 [corrected] families with at least two affected individuals, performing the largest linkage scan to date while also analyzing copy number variation in these families. Linkage and copy number variation analyses implicate chromosome 11p12-p13 and neurexins, respectively, among other candidate loci. Neurexins team with previously implicated neuroligins for glutamatergic synaptogenesis, highlighting glutamate-related genes as promising candidates for contributing to ASDs. 相似文献
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世界的生物多样性很大程度上受到传统农业耕作方式的保护。这些生态上复杂的农业系统与作物遗传多样性中心相联系,有传统的栽培品种或“地方品种”,作为世界作物遗传资源的重要组成,还有野生的植物和动物种群,作为生物资源服务于人类。 相似文献
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