In this paper , the nacre of hyriopsis cumingii ( lea ) which is one of the main freshwater pearl - forming mollusk in china is studied emphatically , as compared with the nacre of three species of saltwater pearl - forming mollusks , pinctada martensii ( dunker ) , pinctada maxima ( jameson , and peteria penguin ( roding ) . the basic characteristics of nacreous and prismatic layers are understood by powder x - ray diffraction analysis , trace elements analysis , amino acid composition of protein and differential thermal analysis 本文以我国主要育珠蚌淡水三角帆蚌贝壳珍珠层为重点研究对象，以三种海水育珠贝马氏珍珠贝、企鹅珍珠贝及大珠母贝贝壳珍珠层为对比研究对象，首先通过粉末x -射线衍射、微量元素分析、蛋白质氨基酸分析及差热分析对珍珠层及其与之密切共生的棱柱层的基本特征进行了初步研究。
Based on these results , main attentions are paid to the microstructure of nacre according to the study of x - ray diffraction m scanning electron microscopy , transmission electron microscopy and micro - raman spectra , and attentions also to the organic matrix especially the carotenoids in nacre according to in situ study of resonance raman spectra 在此基础上，重点采用x -射线衍射、扫描电子显微镜、透射电子显微镜及显微拉曼光谱等对珍珠层的微结构进行了较详细的研究，同时采用拉曼光谱对珍珠层中的有机质特征进行了原位分析研究。
