映射系统中的零序列

设（Ｅ，ｒ）是局部凸拓扑向量空间，Ω是任意抽象集合，Ｆ∈Ｅ＾Ω，（ｘｊ）∈Ω是映射系统（Ω，Ｆ）中的零序列，即对每个ｆ∈Ｆ，（ｆ（ｘｊ））都是（Ｅ，τ）中收敛于０的序列，本文给出了序列（ｆ（ｘｊ））的Ｆ的子集Ｂ上一致收敛于０的刻划。     

On the newly proposed levels in152Gd and152Sm

It is shown that there is no evidence for the existence of levels at 1312.41, 1485.67 and 1698.34 keV in¹⁵²Gd and at 1436.65 and 1681.56 keV in¹⁵²Sm, which were recently claimed to be observed in the decay of¹⁵²Eu(3^–, 15 y).Work supported in part by the Natural Science Fund of China and in part by the Department of Science and Technology of China Nuclear Energy Industry Corporation     

替考拉宁键合手性固定相的制备及其在反相条件下对手性化合物的拆分

以国产大环抗生素替考拉宁为手性选择剂制备了替考拉宁键合手性固定相(Tei-CSP),在反相条件下考察了键合相对华发令、西孟旦等手性药物、α-氨基酸(羟基酸)、衍生α-氨基酸的拆分效果。实验结果表明,在反相条件下,疏水(亲水)作用、静电作用对手性化合物在柱上的保留以及对映体的拆分起到了非常重要的作用;氨基酸在衍生前后,其在柱上的保留和手性识别机理发生了改变,衍生前,亲水作用参与保留机理,而衍生后,由于疏水作用增强,疏水作用参与保留,对映体在较低的有机改性剂条件下才能获得较好的分离。     

Some Problems for Sequential Effect Algebras

In 2005, Professor Gudder presented 25 open problems of sequential effect algebras, and in this paper, we survey the development of these problems, and we point out two new interesting topics in the sequential effect algebras, too.     

The Characteristics of Expansivity of Two Variables Weighted Shift

Recently, Curto and Yoon considered a two variables weighted shift W and constructed three different families of commuting pairs of subnormal operators such that each family can be used to answer a conjecture of Curto, Muhly and Xia negatively. In this paper, first, we show that the k-expansivity, k-hyperexpansivity and completely hyperexpansivity of W can be characterized completely only by its moments. Next, we present several interesting examples to give out the applications of these results.     

硒代二半胱氨酸对白血病细胞系的诱导分化研究

硒抑制体外白血病细胞的生长和增殖．并能诱导部分白血病细胞分化成熟。但其药理作用因硒制剂的不同而异．硒代二半胱氨酸抑制V937和K562血病细胞的生长和增殖，半数抑制浓度为3．0μmol／L，经30μmol／L硒代二半胱氨酸作用3天后，U937胞吞噬率以5％上升至14％，K562细胞内血红蛋白含量由0．20增至0．40μg／10^6细胞，说明硒代二半胱氨酸能诱导部分白血病细胞分化成熟。     

新型离子交换硅胶键合相的制备及评价

二甲基氯硅烷与硅胶表面反应,形成牢固的ＳｉＨ键之后,连接上活泼的中间体——烯丙基缩甘油醚作为柔软的分子臂,最后接上二乙基氨基,由此制得了新型的离子交换硅胶键合相。经漫反射红外光谱、元素分析和高效液相色谱法对键合相进行了鉴定和评价。结果表明：键合反应按预定路线进行,键合相具有较好的色谱性能。此种方法可有效地运用于无孔硅胶填料的制备。     

一类无限矩阵拓扑代数

Let λ and μ be sequence spaces and have both the signed-weak gliding hump property, (λ,μ) the algebra of the infinite matrix operators which transform λ into μ. In this paper, it is proved that if λ and μ are β-spaces and λ^β and ,μ^β have also the signed-weak gliding hump property, then for any polar topology τ, ((λ,μ),τ) is always sequentially complete locally convex topological algebra.     

替考拉宁键合手性固定相高效液相色谱法直接拆分泮托拉唑钠对映体

以替考拉宁为手性选择剂制备了大环抗生素类手性固定相替考拉宁键合手性固定相(T-CSP),建立了T-CSP反相液相色谱直接拆分泮托拉唑钠对映体的方法。考察了流动相中有机改性剂的种类和比例、柱温以及流动相流速对拆分泮托拉唑钠对映体的影响。研究发现,用甲醇作有机改性剂比乙腈更有利于对映体的分离;在研究的温度范围内,随着柱温的升高,对映体的保留时间缩短,同时分离因子和分离度降低;在一定范围内降低流速有利于对映体的分离。采用T-CSP色谱柱(150 mm×4.6 mm i.d.,5 μm),以甲醇-水(体积比为35∶65)为流动相,在流速0.6 mL/min、检测波长290 nm、柱温20 ℃的条件下,泮托拉唑钠对映体获得了近于基线的分离,所建立的方法具有简便快速及重复性好等优点。