光致聚合物中单体及粘结剂对全息性能的影响

研究了单体及粘结剂等成份对全息光致聚合物薄膜光存储性能的影响。在相同引发条件下．以丙烯酰胺作为单体时，光聚物的衍射效率明显高于以丙烯酸和N羟甲基丙烯酰胺作为单体时光聚物的衍射效率。向丙烯酰胺中加入少量N-羟甲基丙烯酰胺，可以改善膜表面的光学质量．降低散射光强度，并提高膜的保存时间。在聚乙烯醇膜中单体聚合程度明显优于在聚乙烯吡咯烷酮中的程度，在大分子量的聚乙烯醇中的衍射效率及感光灵敏度高于在小分子量中的衍射效率和感光灵敏度，而且大分子量的聚乙烯醇能够制备厚膜，这是实现全息海量存储的一个重要因素。

人猿超科较旧大陆猴Fractalkine基因存在30bp缺失突变

下载PDF阅读器观察Fractalkine从旧大陆猴向人猿超科进化过程中基因的进化规律,为研究Fractalkine基因的进化和免疫学功能演变关系提供理论和实验基础,先用简并引物PCR(Degenerated PCR)法分别扩增Fractalkine的3个外显子,其产物经琼脂糖凝胶回收、纯化后测序,然后用BioEdit,Clustal及DNAStar软件拼接、分析各物种间基因序列的差异.发现人猿超科较旧大陆猴Fractalkine基因除了有散在的点突变外,在其粘蛋白样区还有一明显的30个核苷酸的缺失突变,并对突变的可能机制及其对Fractalkine可能的功能影响进行讨论.

猕猴毛发皮质醇测量方法探索

毛发是评估下丘脑-垂体-肾上腺轴(HPA轴)慢性活性变化很好的样品,毛发皮质醇的提取方法非常重要.为保证毛发皮质醇提取过程的可靠性,实验使用了液氮冷冻研磨:设计了空白对照组(磷酸缓冲液(PBS))(n=3)、原管组(n=10)和新管组(n=10),以检验缓冲液、离心管对提取的潜在干扰;对同一动物样品(n=16)两次独立提取的结果及毛发皮质醇浓度与受到的极端攻击量(血浆皮质醇浓度的间接指标)(n=16)进行了Pearson相关分析.结果表明:空白对照组测量结果为0pg/mg:新管浓度值与原管无显著性差异(F(1,19)=0.041,P=0.843,one-wayANOVA);两次独立提取结果高度正相关(r=0.893,P=0.000);皮质醇浓度与受到的极端攻击量中度正相关(r=0.591,P=0.008).因此,离心管、缓冲液对实验没有显著性干扰,溶液中皮质醇来源于毛发样品;提取操作流程可靠,所得数据可信.

Geographic variation of Chevrier's field mouse (Apodemus chevrieri) (Milne-Edwards, 1868) (Muridae : Murinae) from southwestern China based on cranial morphometric variables

Geographic variation of Chevrier's field mouse (Apodemus chevrieri) (Milne-Edwards, 1868) (Muridae: Murinae) from southwestern China based on cranial morphometric variables. Zoological Studies 47(4): 393-401. A sample of 134 specimens of Apodemus chevrieri was investigated in the present study. Individuals were divided into male and female groups, and these were respectively subjected to multivariate analysis. Results indicated that 3 geographic populations of A. chevrieri inhabit southwestern China: a Sichuan population in western Sichuan Province; a northwestern Yunnan population ranging from northwestern Yunnan Province eastward to southern Sichuan Province; and a central Yunnan population in central Yunnan Province. In addition, a coefficient of difference analysis was performed among these 3 geographic populations. The results suggested that these 3 geographical populations of A. chevrieri belonged to 2 subspecies. Furthermore, we discuss the relationships of the subspecific differentiation of A. chevneri with changes in latitude in southwestern China.