Effects of chloride substitution on the chemical and physical properties and the crystallization behavior in heavy metal fluoride glasses

Effect of the substitutions of chloride for fluoride on the chemical and physical properties and the crystallization behavior in heavy metal fluoride glasses has been investigated. The characteristic temperature of the glass does not changed obviously when the fluoride was taken place by chloride. Compared with samples of being free of ErF3, the doping samples are more inclined to be surface crystallization. Optical basicity in the glass system increases with increasing the negative charge provided by the chloride atoms and the absorption peak red shifted is observed in absorption spectra. XRD measurements show that not a single crystalline phase appears in the heated glass samples, which indicate the substitutions of chloride for fluoride with a variety of crystalline precipitation trends. (c) 2007 Elsevier B.V All rights reserved.

用于波导放大器的Er^3＋／Yb^3＋共掺磷酸盐玻璃的性能研究

通过优化熔融条件和玻璃组份，成功开发出一种新的Er^3+／Yb^3+共掺磷酸盐玻璃，其在沸水和熔盐中均表现出很好的化学稳定性。通过分析室温下Er^3+／Yb^3+共掺磷酸盐玻璃的吸收光谱，计算得到了Er^3+离子在波长1533nm处的峰值发射截面和杜得-奥菲而特强度参数；其中Er^3+离子在波长1533nm处的峰值发射截面为0．72×10^20cm^2，大于Schott的IOG1玻璃中Er^3+离子的峰值发射截面0．67×10^-20cm^2。通过改变离子交换的条件，获得了1．55μm单模光波导的制作条件

MOCVD growth and properties of ZnO thin films on LiNbO3 substrates

ZnO thin films were grown on (0001)LiNbO3 substrates by the MOCVD technique. The substrate temperatures during growth were changed from 400 to 600 degrees C. The X-ray diffraction (XRD) pattern of the ZnO film showed a strong [002] reflection peak, and the peak intensity was dependent on substrate temperature. The ZnO columnar grains were highly oriented along the (002) direction when the film processing temperature was 600 degrees C. The optical transmission and PL results also indicated that highest crystalline quality of the ZnO films could be obtained at elevated temperatures. (c) 2005 Elsevier B.V. All rights reserved.

LiGaO_2衬底上ZnO外延膜的结构与光学特性

采用磁控溅射法在(001)、(100)及(010)LiGaO2衬底上制备了ZnO薄膜,通过X射线衍射(XRD)、原子力显微镜(AFM)、透过光谱以及光致发光谱(PL)对薄膜的结构、形貌及光学性质进行了表征。结果表明LiGaO2衬底不同晶面上制备的ZnO薄膜具有不同的择优取向,在(001)(、100)及(010)LiGaO2上分别获得了[0001][、1100]及[1120]取向的ZnO薄膜;不同取向的ZnO薄膜表面形貌差异较大;薄膜在可见光波段具有较高的透过率;在ZnO薄膜的光致发光谱中只观察到了位于378 nm的紫外发射峰,而深能级发射几乎观察不到,(1100)取向的薄膜紫外发射峰强度最大,半高宽也最小,薄膜光致发光性质的差异主要和晶粒尺寸有关。

MULTIPLE GENOTYPES OF MITOCHONDRIAL-DNA WITHIN A HORSE POPULATION FROM A SMALL REGION IN YUNNAN PROVINCE OF CHINA

mtDNA genotypes of six domestic horses (three adult short horses whose heights are under 1 m and three common domestic horses) from a small region of 15 km(2) in Malipo county of Yunnan province of China were investigated by the technique of restriction fragment length polymorphism (RFLP) with restriction endonucleases which recognize 6-bp sequences. An average of fragments for an individual was obtained. Unlike other domestic animals, this population of horses exhibits high mtDNA genetic diversity. Each of the six horses has a specific mtDNA genotype showing a pattern of multiple maternal origins, as suggested by fossil and literature records. We think the population of horses is an amazing seed-resource pool of horses and hence deserves to be paid more attention from the view of conservation genetics. However it is also remarkable that we did not find any typical mtDNA genetic markers which would discriminate between short horses and common domestic horses.

大蹼铃蟾博玛津蛋白及其基因和在制药中的应用

本发明涉及一种大蹼铃蟾博玛津蛋白及其基因和在制药中的应用，属于生物医学领域。大蹼铃蟾博玛津蛋白是从中国两栖类动物大蹼铃蟾皮肤分泌物中分离得到的一种单链多肽，氨基酸全序列为：NH2GFPIYEIDNRPGCYVDPAERVACAGAGVTKAECKAKGCCFISARRNTIWCFKLKESADAWKCAVPMNTRVACAGAGVTPAECKGKGCCFSSYYGTV WCFKPQE-COOH)编码大蹼铃蟾博玛津蛋白的基因的cDNA由1061个核苷酸组成，编码成熟血小板活化蛋白为第67-378位核苷酸。博玛津具有诱导血小板活化、抑制胃溃疡的作用，可作为血小板聚集诱导剂和制备胃溃疡药物的应用。

一个脱毛相关基因及其应用

本发明涉及一个脱毛相关基因及其应用，属于生物技术领域。本发明确定了一无毛基因与昆明小鼠脱毛性状的相关性。该基因被定位于小鼠14号染色体，在细胞遗传图谱上的位置是14D1，在连锁图谱上的位置是39.5cM，全长约20.281KbDNA序列，转录产物(cDNA)有4017bp，含有19个外显子，从成熟mRNA的第378位(2号外显子)开始翻译，共编码1182个氨基酸残基。通过测序，该基因第2817位无义突变(C→T)是导致昆明种犀牛小鼠KIZ脱毛的遗传基础。而且，该基因在人类基因组中也非常保守，具有相似的功能。所以该基因可以用来研究人秃头症的致病机理，以及作为设计治疗丘疹性秃头症药物的靶基因。