5-Br-PADCAP分光光度法测定血清锌

为建立快速、简便、灵敏的分光光度法测定血清锌 ,在表面活性剂TritonX -1 0 0存在下 ,用 2 -(5 -溴 -2 -吡啶偶氮 ) -5 -[N ,N -二羧基甲基 ]苯酚 (5 -Br-PADCAP)作显色剂 ,不去蛋白分光光度法测定血清锌。结果表明 ,锌络合物最大吸收波长为 5 5 7nm ,线性范围 0～ 5 0 0μmol L ,摩尔吸光系数为 1 1 2× 1 0 5L·mol-1·cm-1。回收率为 99 9% ,批内变异系数 (CV)为2 1 % ,批间变异系数为 2 9% ,与原子吸收分光光度法 (x)比较具有良好的相关性 ,y =1 0 1 0x-0 1 5 4,r=0 991 8,P >0 0 5。可见本法测定血清锌不必去蛋白、用血量少、方法简便、灵敏可靠 ,适合临床应用     

ZnO微晶的水热合成及形貌控制研究

以Zn(NH3)4(Ac)2为前驱体,不加任何模板剂和表面活性剂,低温下通过改变反应条件(如前驱体浓度、反应时间及反应温度),实现了对ZnO微晶形貌和尺度的有效控制.所得花状、蜂窝状、柱状ZnO用X射线衍射仪和扫描电镜进行了鉴定和表征,并初步探讨了不同形貌ZnO微晶的生长机理.     

DABCO-directed self-assembly of bisporphyrins (DABCO=1,4-diazabicyclo[2.2.2]octane)

Three isomeric zinc bisporphyrins have been prepared by covalently linking together two aminoporphyrins with an isophthalic acid derivative. The porphyrins differ in the substitution pattern on the meso phenyl groups, that is, ortho, meta, or para. Titrations carried out by UV-visible and 1H NMR spectroscopy have been used to map out the stabilities and the stoichiometries of the complexes formed with 1,4-diazabicyclo[2.2.2]octane (DABCO) in chloroform. The ortho- and meta-substituted bisporphyrins form 1:1 intramolecular sandwich complexes. The para-substituted bisporphyrin cannot adopt the cofacial conformation required for this type of complex and forms a higher order 2:2 intermolecular assembly, which is stable over a wide range of DABCO concentrations.     

2-氨基-4, 6-二甲基嘧啶与锌盐配合物的制备及生成焓测定

Thepyrimidinesasaclassareknowntopossessextraordinarybiologicalpropertiesthataregenerallydistinguishedqualitativelybytheirapplicationsinpesticide,herbicide,bactericide,andmedicineinter-mediates犤1犦.Asurveyoftheseapplicationsandanum-beroftherelatedvariationsthataredevelopedrecent-ly,suchastheextraordinaryeffectiveherbicideofsulfonylsulfourea,revealsthebroadbiologicalimpor-tancejustbecauseofthewideoccurrenceofpyrimi-dinesringsystemsinthesemolecules犤2犦.Ithasbeenshownthatthemedicineintermediates…     

周岁内幼儿头发中锌钙含量的动态分析

对合肥市16671名1－12个月幼儿的发锌，钙含量进行了测定，并对测定值进行了统计分析。结果表明，锌，钙的含量随着月龄的增加呈直线递减。并给出了发锌，钙含量的趋势线方程，丰富了目前文献给出的发锌，钙的标准值，为及时准确判断周岁内幼儿微量元素锌，钙缺乏程度提出依据。     

The ionization of perchloric and hydrofluoric acids in aqueous solution

Cyclical bifurcated hydrogen bonded structures are proposed for aqueous solutions of hydrofluoric acid and for the bifluoride ion which are consistent with the spectral data. The structure proposed for HF is also applicable to solutions in organic solvents. Raman spectra of tetramethylguanidinium perchlorate suggest that the corresponding Raman spectra of perchloric acid solutions may not be interpreted in terms of a completely dissociated acid. Other evidence including activity coefficient, heat capacity and partial molal volume data suggest that there is some association in relatively dilute perchloric acid solutions between the perchlorate ion and the hydrated proton. This association decreases in concentrated aqueous solutions.     

The influence of the sacrificial anode nature on the mechanism of electrochemical arylation and alkylation of white phosphorus

The material of the sacrificial anode has a substantial effect on the nature and yield of the target products of electrochemical phosphorylation of organic halides by white phosphorus in the presence of the nickel complexes with 2,2"-bipyridine. The use of the zinc anode results in the products with tricoordinated phosphorus, viz., triorganylphosphines, the reaction on the aluminum anode affords triorganylphosphine oxides, and the presence of Mg²⁺ ions in the reaction mixture provides the transformation of white phosphorus into cyclic phosphines (PhP)₅.     

四元体系KCl-ZnCl2-HCl(～10.61%)-H2O(298.15K)的相平衡及其固相化合物

０引言研究发现，卤化物KX与ZnX２组成的复盐化合物是一种良好的激光基质材料犤１犦，在掺杂了稀土离子的这些化合物中已经实现了低温或室温下的激光输出犤２，３犦。在卤化物中，氯化物的发光强度又大于氟化物犤４犦。因此，我们以KCl与ZnCl２为研究对象，通过盐酸溶液中的相化学反应来了解它们之间可能形成新化合物的种类和溶液中的反应行为。本文对KCl与ZnCl２在２５℃１１％的盐酸－水四元体系中的相平衡关系进行了研究，并从体系中发现并得到了未见文献报道的５∶４型新化合物５KCl·４ZnCl２·３H２O。１实验部分１．１药品及…     

四针状氧化锌晶须的制备及其吸波性能的研究

随着雷达探测、卫星通信、航天航空和电子对抗等高科技的发展，特别是近年来抗电磁波干扰、隐形技术、微波暗室等研究领域的兴起．对电磁波吸波材料的研究日益受到人们的重视。随着现代电子工业和信息产业的高速发展．产生电磁波的电子产品（诸如计算机、电视机、手机、微波炉及电磁炉等）的数量急剧增加，