系统树,Phylogenetic tree
dendrogram['dendr?ɡr?m]系统树
3)dendrogram['dendr?ɡr?m]系统树图
1.Unweighed pair-group method of with arithmetical averages (UPGMA) cluster analysis was used to construct a dendrogram and to estimate the genetic distances .采用UPGMA构建系统树图进行聚类分析和计算遗传距离。
4)UPGMA phylogenetic dendrogramsUPGMA系统树
5)tree system树系统
1.In this paper, the chain forms of L-E and N-E have been developedinto tree systems,Concepts of“empty body”and“void road” are introduced.本文把单开链形式的L-E法和N-E法动力学方程推广到树形系统,引进了“虚体”、“虚路”等概念,在此基础提出了“分路”思想,这种方法具有建模效率高,分析难度低,适合于计算机编程等优点,是一种处理树系统动力学的好方法。
6)system without tree structure非树系统
1.The cut-off joints constraint equation is one of the most important parts in the multi-body system without tree structure program.多体系统动力学从非树系统派生出树系统的计算需要进行切断铰的处理。
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海南龙血树(小花龙血树)DracaenacambodianaPierreexGagnep.百合科Liliaceae乔木状,高3-4m。叶聚生于茎和枝顶,几呈套叠状,长约70cm,抱茎,无柄。圆锥花序长约30cm,花序轴无毛或近无毛。分布于海南西南部,生于背风区的干燥砂土上。越南、柬埔寨也有分布。国家三级保护濒危种。