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。
To avoid the effects of cosmetics and perfume , pearls should be the last thing a woman puts on before going out and the first thing she takes off after returning home . also , pearls are quite soft , so for the longest - lasting pearls choose those with thick nacre that can help them withstand wear over time . the best way to care for pearls is to wear them often because the body s natural oils keep them lustrous 从报导的实例来看，由于珍珠紧贴人的颈部，它的有效成分可以经摩擦进入人体，珍珠对体液分泌有一定吸收能力，皮肤对珍珠中所含药物成分也有吸收，乃至影响局部患处，起消炎治疗作用至于能治疗神经衰弱症，是因为珍珠具有镇惊安神作用，但珍珠项链如何起安神作用还值得具体研究。
Application as widely used all over the world , it is a good substitute for asbestos in construction industry , an ideal filling material for paint , dope , rubber and plastic , and its application goes as far as to manyother fields like electric welding , fire retardant , electronic products , oil well drilling and nacre dye 经加工成云母粉还有较好地滑动性和较强的附着力。由于云母和云母粉本身的性能，主要有如下用途：日用化工原料云母陶瓷原料油漆添料塑料和橡胶添料建筑材料用于焊条药皮的保护层用于钻井泥浆填加剂等。
