真核细胞的内共生起源是一种 进化机制 美国生物学家马古利斯 • 水平进化(horizontal evolution) :是同种生物 之间的微小的基因变化。这种变化往往是由所处 的环境决定的 。
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Horizontal gene transfer is an important evolutionary mechanism in prokaryotic genome evolution and has been widely studied.
在原核生物的进化过程中,基因的横向转移是一个重要的进化机制。
The study manifested the uncoupled pattern of the peak stresses in vertical and horizontal directions, as well as the stress evolution trace varying with pillar width.
揭示了煤体边缘水平应力和垂直应力峰值不耦合的规律以及巷道顶板应力峰值随煤柱宽度不同而演化的轨迹。
On the basis of the concept of the vertical crooked arm in material mechanics, a quantitave analysis of the distribution and evolution of horizontal shear stress in vertical folding is discussed.
根据材料力学纵弯杆概念,从定量角度分析了横向剪应力在纵弯褶曲中的分布和演化。
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