The adventitious root is triarch,and has the secondary structure.
不定根为三原型，具次生结构。
Secondary structure
英语例句库
Using ultraviolet spectrum, fluorescence spectrum and Fourier-transform infrared spectrum, the secondary structure of polyhedrin was studied.
对多角体蛋白进行紫外、荧光、红外光谱分析，并通过去卷积的方法分析了该蛋白的酰胺Ⅰ带。
The changes of intermolecular forces and secondary structure of the rice protein modified by deamidation with acid were studied.
大米蛋白经酸法脱酰胺改性引起分子间作用力和二级结构发生变化。
A helical conformation of a polypeptide chain, usually right-handed, with maximal intrachain hydrogen bonding; one of the most common secondary structures in proteins.
折叠是由若干肽段或肽链排列起来所形成的相当伸展的片层构象。
The sequences and secondary structures of IRES are compared.Interaction between IRES and translation initiation factors and relation with virulence of FMDV is summarized.
本文对IRES的一、二级结构进行了比较，对IRES与翻译起始因子的相互作用以及对病毒毒力的影响作了综述。
原声例句
PBS地球-动物趣闻
Another weird thing is, a beak isn't the only innovation that can beat teeth - it looks like other secondary feeding structures can, too.
另一件奇怪的事情是，喙并不是唯一可以打败牙齿的创新——它看起来像其他二次喂养结构也可以。
Reel知识卷轴
It does of course have a secondary structure from the later occupation phase built inside it, but we do have a good sense of what a broch may have been in its completed form.
当然，它里面有一个在后来居住阶段建造的二级结构，但是我们确实通过它对于 broch 完整的样子有了很好的感知。
英语百科
Biomolecular structure
Biomolecular structure is the intricate folded, three-dimensional shape that is formed by a protein, DNA, or RNA molecule, and that is important to its function. The structure of these molecules is frequently decomposed into primary structure, secondary structure, tertiary structure, and quaternary structure. The scaffold for this structure is provided by secondary structural elements that are hydrogen bonds within the molecule. This leads to several recognizable "domains" of protein structure and nucleic acid structure, including secondary structure like hairpin loops, bulges and internal loops for nucleic acids, and alpha helices and beta sheets for proteins.
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