警惕锌剂治疗的毒性和副作用

临床实践证明某些疾病补锌治疗有效，但也发现1％左右的人出现副作用，人类对锌过量虽具有耐受性，但据报道不管是急性中毒量，治疗量，还是常用的自选补充量，均可出现中毒症状。原因是锌与其它元素间有相互作用，特别是与铜的拮抗作用，所以用锌剂一定要严格掌握适应症、剂量、疗程，以免引起不良反应，影响儿童健康。     

铕－邻菲罗啉－甲基苯甲酸二、三元配合物的NMR研究

本文报道了希土铕（Ｅｕ３＋）与甲基苯甲酸（包括邻位０－ＭＢＡ．间位ｍ—ＭＢＡ，对位ｐ－ＭＢＡ）及邻菲罗咐（Ｐｈｅｎ）形成的二元和三元固体配合物的制备，对它们进行了元素分析，确定该配合物的组成为：二元：Ｅｕ（ＣＨ３Ｃ６Ｈ５ＣＯＯ）３，三元：Ｅｕ（ｐｈｅｎ）（ＣＨ３Ｃ６Ｈ５ＣＯＯ）３．对上述配合物的结构作了核磁共振氢谱（１ＨＮＭＲ）和碳谱（１３ＣＮＭＲ）的研究，并用红外光谱（ＩＲ）作了进一步确定．     

LiCl急冷过程中结构变化研究的一种几何学方法

计算了900 K、698 K、498 K和298 K温度下共4800个Voronoi多面体并对它们进行了统计分析. 计算表明: 在玻璃态转变温度区间, Voronoi多面体的统计分布有明显的变化。在以阳离子为中心的Voronoi多面体中, 在298 K时,四面体、五面体和六面体占总数的80%以上。     

用交流阻抗法研究某些离子选择电极的响应特性

用交流阻抗法研究了两种液膜胆R汁酸电极和两种聚氯乙烯(PVC)膜钙离子选择电极. 从体电阻R_b和电荷传递电阻R_(ct)得到膜内离子迁移活化能E_a, 及电极的表观标准交换电流密度i°_0等信息. 结果表明: E_a比R_b更能反映离子在膜内迁移的情况, 离子在PVC膜中的迁移比在液膜中困难得多; i°_0能在一定程度上反映电极性能的优劣等。     

Debye screening for two-dimensional Coulomb systems at high temperatures

The grand canonical ensemble of a two-dimensional Coulomb system with±1 charges is proved to have screening phenomena in its high-temperature region. The Coulomb potential in a finite region is assumed to be (–)^–1, where is the Laplacian with zero boundary conditions on. The hard-core condition is not assumed. The model is set up by separating (–)^–1 into a shortrange part and a long-range part depending on a parameter. The self-energies are subtracted only for the short-range part and therefore a choice of is a choice of subtraction of self-energies. The method of proof is in general the same as that of Brydges-Federbush Debye screening, except that here a modification for the short-range part of the potentials is needed.     

Mössbauer study on surface magnetic properties in magnetic fluids

The presence of m=0 lines of the Mössbauer spectra of small Fe₃O₄ particles coated with an organic surfactant in an applied field of 7 T at 5 K shows a non-collinear magnetic structure in the surface layer of these particles. From the temperature dependence of the hyperfine field, the anisotropy constantK was calculated.Projects supported by the Science Fund of the Chinese Academy of SciencesNow working at the Shanghai Institute of Education