MgSO4—H3BO3—UO2^2＋—H2SO4体系中含铀晶体化合物的制备及结 …

着重讨论在ＭｇＳＯ４－Ｈ３ＢＯ３－ＵＯ２＾２＋－Ｈ２ＳＯ４体系中,制备含铀的日 体化合物。通过红外光谱, 热分析及Ｘ射线衍射等手段确定其结构为（ＵＯ２）３（ＳＯ４）２（ＯＨ）２．８Ｈ２Ｏ。     

微乳液反胶团法制备超细微粒SO2-4/ZrO2催化剂

应用AS/环己烷/水的微乳液反胶团体系制备超细微粒So2-4-/ZrO2催化剂,研究了焙烧温度对纳米催化特性的影响,通过酯化反应表征了超细微粒SO2-4-/ZO2催化剂的催化作用,得到具有应用价值的良好结果.     

酶法水解大豆苷中的含糖部分

Saponin is the general name of low polymerized glycosides and in which the steroid or terpenoid is aglycone.The soybean saponin is composed of the triterpenoid aglycones (sapogenols)and sugar-moiety.Soybean saponin was divided into group A,group B,group E and group DDMP by the aglycones［1-3］.It has been shown that soybean saponin has a lot of physiological activities and pharmacological action.For example,it can be used to resist cancer,adjust immunity,prevent and treat heart blood vessel disease.In addition, soybean saponin has been extensively used in cosmetics.However,the soybean saponin has dry mouth feel(DMF)which decreases the quality of soybean food products.Many facts have verified that sugar-moiety is very important to the biological activity of saponin［4］.For example,in ginseng saponin of binary alcohol,the saponins which contain five sugar-moieties such as Ra1,Ra2,Ra3,have low activity,however,saponins containing one sugar-moiety like Rh2 have very strong activity of resisting cancer.When the sugar-moiety of soybean saponin was removed out,some special activities like resisting oxidation and resisting thrombus emerged and the DMF would decrease.But,reports concerning the sugar-moiety hydrolysis of soybean saponin by enzyme have not been found.In the paper,the enzyme hydrolysis of soybean saponin sugar-moiety and the strains producing hydrolytic enzyme of saponin were studied.     

基于Excel函数及Excel VBA的成绩分析

本文利用Excel函数及Excel VBA设计制作了多班成绩分析系统,应用此程序可以使教师的成绩分析工作事半功倍.     

交替嵌段型BAMO-AMMO热塑性弹性体的性能

以3,3′-双叠氮甲基环氧丁烷-3-叠氮甲基-3′-甲基环氧丁烷(BAMO-AMMO)三嵌段共聚物为预聚物,甲苯二异氰酸酯(TDI)和1,4-丁二醇(BDO)为扩链剂,采用溶液法合成了交替嵌段型BAMO-AMMO热塑性弹性体,并进行了结构和相关性能的表征。结果表明,弹性体中叠氮基团与氨基甲酸酯形成氢键作用,氢键键合氨基与自由氨基的摩尔比为3.56∶1。弹性体的数均相对分子质量为30432;随着扩链剂含量(w(TDI+BDO))的增加,Tg逐渐升高;TDI和BDO的质量分数为20%时,Tg为-42.14℃,拉伸强度可达9.21 MPa,断裂伸长率为375%,蠕变恢复时间为200s,其最小形变值为0.1%,具有良好的抗蠕变性和蠕变恢复能力。