SiO2 glassy materials with Ge crystals embedded were formed by heating GeO2/SiO2 glass at 700 in the presence of hydrogen. GeO2/SiO2 glass was prepared with the sol-gel technique. The Ge/SiO2 samples show a special photoluminescence property and exhibit strong luminescence at 392 nm（3.12 eV）, secondary strong luminescence at 600 nm（2.05 eV） and weak luminescence at 770 nm（1.60 eV） when excited under 246 nm（5.01 eV） ultra-violet light at room temperature. The structure of this new luminescence material was studied with XRD, XPS, and TEM. The results show that the presence of nanometer sized（around 10 nm） Ge and GeO crystals in the SiO2 may cause the three-band photoluminescence. The GeO2/SiO2 glass without going through the reducing process only has GeO2 in the SiO2 glass, and does not show the photo-（luminescence）.
本实验采用扫描电子显微镜、X射线衍射、拉曼、红外等现代光谱技术和数据库、计算软件等,层层剖析猪心肌高铁肌红蛋白(pig metmyoglobin,p Met Mb)冻干粉的结构特征和分子动态结构信息。结果表明,p Met Mb冻干粉表观呈明显的棱状结晶体,结晶度为(95.60±1.37)%,三晶胞轴长不相等(a≠b≠c),可归属于高晶度含水单斜结晶体。根据晶体数据库同类化合物比对,得到p Met Mb肽链和heme-Fe的关键基团来源;经拉曼和红外光谱解析和推算,p Met Mb肽链均有α螺旋、β折叠、β转角和无规卷曲4种蛋白质二级结构,分别占50%、14%、24%和12%;分别由3个酰胺区中C=O、C=C、C—N、—COO-、C—H、N—H的不同振动形式所产生;六配位低自旋的Fe—C—N形成heme-Fe3+。因此,p Met Mb为六配位低自旋构象,是结构紧密、性质稳定的球状蛋白质。
