含二茂铁基为臂的三角架型过渡金属配合物的研究

本文利用2,2',2"-三氨基三乙胺(tren)与二茂铁甲醛(FeCHO)的Schiff碱缩合产物(L)为配体合成了十个三角型过渡金属配合物:[MLX]^(2+1+),M=Zn^(2+),Cu^(2+),Ni^(2+),Co^(2+)和Mn^(2+),X=H_2O或OAc^-,并用电子光谱、红外光谱和顺磁共振光谱对配合物的结构进行了表征.测定了四个化合物的变温磁化率,实验结果表明二茂铁中反铁磁性的Fe(Ⅱ)离子对配合物的磁性影响很小,整个化合物只显示中心离子的磁性.

红菜薹原生质体培养植株再生

一、目的与材料方法 红菜薹属白菜类(B.campestris),其原生质体培养成功可供外源基因的直接转化和细胞质杂种合成雄性不育系之用。白菜类是十字花科中最难由原生质体再生出植株的种类之一(Hachey等,1991)。目前,大白菜的再生成株已有报道(李世君等,1992;Glimelius,1984),但再生频率低(3.3％,1％)。本试验试图建立起红菜薹原生质体有效的再生程序。 1.无菌苗的获得 红菜薹品种为十月红一号,种子在0.1％SDS的0.1％HgCl_2溶液中浸5分钟后,用15％的“Domestos”灭菌15分钟,再用无菌水洗5次,播种在MS基本培养基上发芽,25℃,光照每天16小时,光强1800lx。

LABEL ECONOMICS

"Our goats provide the very best cashmere in the world," claims Li Jing, CEO of 1436, the luxury fashion arm of one of China's best-known conglomerates, Erdos. It's no empty boast: The company pays three times the price of their competitors for genuine arbas goat hair, which must meet exact standards—less than 14.5 micros in fineness and at least 36 millimeters in length, hence "1436."

DESIGNER CHINA

It was the showstopper that launched a thousand memes, on both sides of the Pacific. But Rihanna's 2015 Met Gala dress, featuring a 55-pound gold cape by haute couture designer Guo Pei, was originally considered a risky move.