共查询到20条相似文献,搜索用时 15 毫秒
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Stomatopods (mantis shrimp) are well known for the feeding appendages they use to smash shells and impale fish. Here we show that the peacock mantis shrimp (Odontodactylus scyllarus) generates an extremely fast strike that requires major energy storage and release, which we explain in terms of a saddle-shaped exoskeletal spring mechanism. High-speed images reveal the formation and collapse of vapour bubbles next to the prey due to swift movement of the appendage towards it, indicating that O. scyllarus may use destructive cavitation forces to damage its prey. 相似文献
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Marlis A Merbach Dennis J Merbach Ulrich Maschwitz Webber E Booth Brigitte Fiala Georg Zizka 《Nature》2002,415(6867):36-37
Carnivorous pitcher plants of the genus Nepenthes are not usually very selective about their prey, catching anything that is careless enough to walk on their slippery peristome, but Nepenthes albomarginata is an exception. We show here that this plant uses a fringe of edible white hairs to lure and then trap its prey, which consists exclusively of termites in enormous numbers. This singular feature accounts for the specialization of N. albomarginata for one prey taxon, unique so far among carnivorous plants. 相似文献
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CD95's deadly mission in the immune system 总被引:91,自引:0,他引:91
Krammer PH 《Nature》2000,407(6805):789-795
Apoptosis in the immune system is a fundamental process regulating lymphocyte maturation, receptor repertoire selection and homeostasis. Thus, death by apoptosis is as essential for the function of lymphocytes as growth and differentiation. This article focuses on death receptor-associated apoptosis and the role of CD95 (Apo-1/Fas)-mediated signalling in T-cell and B-cell development and during the course of an immune response. Gaining an insight into these processes improves our understanding of the pathogenesis of diseases such as cancer, autoimmunity and AIDS, and opens new approaches to rational treatment strategies. 相似文献
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《陕西理工学院学报(自然科学版)》2013,(1):73-78
针对客户同时有集货和送货需求时的定位路线问题,建立数学模型,设计两阶段启发式算法。第一阶段为定位配给问题,采用禁忌搜索算法,避免陷入局部最优;第二阶段为集配货一体化车辆路线问题,采用模拟退火算法,具有强收敛性,可以得到全局优化解;然后将两个阶段进行很多次循环迭代最终求得集配货一体化多站点定位路线问题的优化解。通过实例计算验证该启发式算法的可行性和有效性。 相似文献
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Focus on filaments: embryology to pathology 总被引:1,自引:0,他引:1
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