The acidic strength of ordered mesoporous aluminosilicates of MAS-2, MAS-3, MAS-7 and MAS-9 and mi-croporous crystals of Y, L, beta, and ZSM-5 zeolites was systemically investigated by temperature-programmed desorption of ammonia (NH3-TPD). Due to the use of preformed zeolite precursors of Y, L, beta and ZSM-5, the ordered mesoporous aluminosilicates with distinguished acidic strength were obtained, being dependent on the type of preformed zeolite precursors. Therefore, the acidic strength of these mesoporous aluminosilicates could be tai-lored and controlled.
采用高静水压法诱变了黄瓜品种S9925-3,产生了两个稳定的可遗传变异株。采用30对随机配对引物,对该品种的原种及两个变异株进行了扩增片段长度多态性(AFLP)分析。结果表明原种与两个变异植株之间存在明显的多态性。从聚丙烯酰胺凝胶上切下6个差异明显的条带进行DNA测序,并将获得的DNA序列与NCBI(National Center for Biotechnology Information)数据库中的黄瓜DNA数据进行比对分析,确定了变异位点,找到了变异黄瓜系表型变化的可能原因。首次完成了对高静水压处理引起的黄瓜稳定遗传变异系的分子水平分析。研究结果表明,高静水压技术是一种有效的改良作物品系的新诱变工具。
High-quality needle-like CuTaS3 single crystals have been synthesized through a chemical vapor transport(CVT) process.Crystallographic data show the special double chains of edge-sharing TaS6 octahedra.The detailed XPS analysis of CuTaS3 was undertaken and the valence states can be described by Cu+Ta5+3S2-.In addition,CuTaS3 crystals were characterized with Raman spectroscopy.
A three-dimensional silver coordination polymer,[(Ag3（IN）2(CF3COO))]（IN=Isonicotinic acid）,was synthesized under mild hydrothermal conditions and characterized by single crystal X-ray diffraction.The compound crystallizes in the triclinic space group P-1,with unit cell parameters a=0.918 48（5） nm,b=1.013 92（6） nm,c=1.067 05（6） nm,Z=2,R1=0.036 5,wR2=0.095 5.The Ag centers are bridged by the IN and CF3CO2 ligands to form three-dimensional structure.There are strong Ag-Ag bond interaction in the framework.
