中文摘要：

利用扫描电镜和光学显微镜对三角帆蚌贝壳和珍珠的珍珠质层微观结构进行了分析研究,发现贝壳的珍珠质层中存在异常的结构带,主要有柱状珍珠质带,针状晶体带以及棱柱状晶体带.其中柱状珍珠质带中,单片文石板片的厚度超过1μm,是正常珍珠质中文石板片厚度的两倍.而对正常珍珠的珍珠质层的大量观察却未发现类似的异常结构.分析认为这可能是因为贝壳珍珠质的矿化微环境与珍珠的珍珠质矿化微环境不同导致的.并利用圆柱形珍珠囊在钛金属牙种植体表面制备的珍珠质涂层具有沿整个圆周面均匀生长的特点.

英文摘要：

The microstructures of nacre layers in H.cumingiiLea Shells and freshwater pearls were investigated extensively via SEM and optical microscope. The results show that besides the normal laminate nacre layers, there are several special structures in H.cumingiiLea Shells, including columnar nacre, needle-like crystals layer and prism crystals layer. In columnar nacre, the thickness of a single aragonite tablet is 1μm, twice more than the thickness of aragonite tablet in normal nacre. However, these special structures are not found in nacre layers of normal freshwater pearls, which has shining surface. The nacre growth in freshwater pearls occurrs in a closed micro-environment of mantle sacs resulting in a uniform structure of nacre layers. The nacreous biocoatings were biofabricated on titanium implants using cylinder mantle sacs and were analysed by optical microscope and X-ray photograph. The results show that the nacreous biocoatings grow along the surface of the titanium implants.