The structure of many proteins is mostly described in three levels, but a quaternarystructural level must be considered if the protein consists of more than one polypeptide chain.
许多蛋白质结构主要用三种标准描述，但是如果蛋白质包含一个以上的多肽链，就必需考虑四级结构标准。
2
This paper deals with geometry and structural characteristics of the active faults existent since Quaternary and geological setting for the formation of the active faults.
笔者在阐述了温泉盆地第四纪以来活断层的几何特征、构造特征的基础上，阐述了活断层产生的地质背景。
3
This paper deals with the structural formula of polyethylene glycol quaternary ammonium by the 13C-NMR and 1H-NMR spectra.