结构单位是指由自然因素形成的土粒复合体,比较稳定,分布在全剖面,结构体的界面清楚,彼此间易分开,亦称结构体。其中,经过团聚作用而形成的结构体称为团聚体,孔隙性较好,主要分布在耕层,一般直径小于10,常用筛分法或水中沉降法分开。
原子是元素最小的结构单位。
概念是人类思维的基本结构单位。
神经元是神经系统基本的结构单位和功能单位;
the fundamental structural and functional unit of the nervous system is the neuron;
I do want to talk about one important subject which you might not have thought too much about and that's lipids, because lipids are so important to the structure of the body because they make up the membranes that form the cells that are the fundamental units.
我的确想要讨论一个重要的主题,这个主题也许你们都没有深入思考过,那就是关于脂类的问题,脂类对身体结构形成十分重要,它是组成细胞膜的基本单位,而细胞膜能够维持细胞形态
Estrogen can combine with this receptor to form a new sort of unit which interacts with DNA.
雌激素能够与受体相结合,形成一个新结构单位与DNA相互作用
So this is a monomer or a single unit from an RNA molecule, you know that because it's ribose and it's the particular molecule that has as its organic base.
所以这是一个RNA单体,即RNA上一个单独结构单位,你通过核糖,和碱基就能够确认它是RNA,这个RNA单体的碱基为A
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