PKA国家参考品的制备

本文应用 PKA 微量滴定板方法,用 WHO1984年建立的 PKA 国际标准品进行标定,制备了我国第一批 PKA 国家参考品。     

黑白染料胶片的现状和前景

黑白染料胶片是继彩色胶片之后发展起来的一种新型黑白胶片品种。本文概述了黑白染料胶片的优点 ,并简介了黑白染料胶片的油乳组成及成像机理。     

Selective chromogenic and fluorogenic signalling of Hg ions using a fluorescein-coumarin conjugate

A novel, Hg²⁺-selective chemosensor was prepared via Mannich reaction of dichlorofluorescein with piperazinyl-coumarin moiety. The dichlorofluorescein–coumarin derivative exhibited well-defined Hg²⁺-selective chromogenic behavior, indicated by a green to pink colour change in solution, as well as fluorogenic signalling. Significant changes in fluorescence of the dichlorofluorescein subunit were analyzed in reference to the rather constant coumarin emission as an internal standard yielding Hg²⁺ selectivity. The Hg²⁺ selectivity of the chemosensor was not appreciably affected by the presence of common coexisting alkali, alkaline earth, and transition metal ions. The detection limit of the dichlorofluorescein–coumarin conjugate for the determination of Hg²⁺ ions was 4.3 × 10⁻⁶ mol L⁻¹ and the conjugate dye could be used as a chemosensor for the analysis of Hg²⁺ ions in aqueous environments.     

Analogy for the maximum obtainable colouration between electrochromic, gasochromic, and electrocolouration in DC-sputtered thin WO3−y films

Tungsten oxide films with varied substoichiometry were deposited by reactive DC-sputtering from a W target at different oxygen partial pressures. The inherent maximum achievable electrochemical colouration and electrocolouration were found to be dependent on the oxygen content and consequently on the film substoichiometry. These results were related to those obtained in a previous study by colouration with hydrogen spillover from a catalyst (gasochromic colouration) of films fabricated in the same way. A clear analogy among the colouration by the three different techniques appeared.     

Polymer dispersed liquid crystal film for variable-transparency glazing

The transmission of visible light and thermal energy through variable-transparency switchable glazing can be varied. Polymer-dispersed liquid crystal (PDLC) has been the most widely used variable-transparency glazing technology in the architectural and automotive industries due to its excellent optical performance, durability, and ease of processing into large-area products. Here we describe the electro-optical performance, temperature stability, and electrical and environmental durability of commercial PDLC products.     

钪—5-Br-PADAP-Triton X-100显色体系的研究

本文研究了钪-5-Br-PADAP-Triton X-100显色体系的光度特性,并确定了钪测定的最佳条件.用单双波长法测定时,钪浓度均在0—11μg/10ml范围内遵循比尔定律,其表现摩尔吸光系数分别为5.9×10~4和7.5×10~4.Triton X-100的加入未能增敏,但能增溶,并显著提高了体系的选择性.从而建立了在水相中测定钪的新方法.用于镁基合成试样中钪的测定,结果满意.     

金黄色葡萄球菌定性定量检测中显色培养基的效果评价

目的 评估显色培养基对金黄色葡萄球菌定性定量的检测效果。方法 对金黄色葡萄球菌标准菌株、食品样本分离菌株：30株金黄色葡萄球菌、30株其他葡萄球菌,5株常见食源性致病菌分别用金黄色葡萄球菌显色培养基和Baird-Parker培养基进行培养试验,并用国标法和全自动微生物鉴定药敏分析系统对培养结果进行确证鉴定。结果 试验定性结果显示金黄色葡萄球菌在显色培养基上呈紫红色,30株其他葡萄球菌呈蓝色或乳白色,5株常见食源性致病菌其中单核细胞增生李斯特氏菌呈蓝绿色、表皮葡萄球菌呈乳白色、其余3株不生长,可在直观上对几种食品中常见葡萄球菌进行有效区别,而且目标菌在显色培养基和Baird-Parker培养基上计数值无显著差异(P＞0.05),确证结果显示全自动微生物鉴定药敏分析系统结果与GB 4789.10-2016方法结果一致。结论 显色培养基能快速锁定疑似目标菌落,为溯源调查指明方向,定量计数直观有效,配合全自动微生物鉴定药敏分析系统更提高了对目标菌的鉴定效率,更适用于金黄色葡萄球菌定性定量检测。     

铱的催化光度法测定概述

就近年来铱催化光度法测定所用的显色剂进行了归纳，重点介绍了研究应用最多的碱性染料类显色剂。     

新6-甲基苯并噻唑偶氮羧酸型试剂与镍显色反应的研究

在６－甲基苯并噻唑偶氮羧酸型试剂分子的苯环中，与羧基相间或相对的位置上引入具有增敏、增溶或掩蔽作用的基团，从而合成了１０个新６－甲基苯并噻唑偶氮羧酸型显色剂。对１０个新试剂与镍（Ⅱ）离子的显色反应及其光度分析特性作了详细研究。结果表明，除二个试剂（６－Ｍｅ－ＢＴＡＨＣＭＢ和６－Ｍｅ－ＢＴＡＣＭＯＢ）外，其它８个试剂作为镍的光度显色剂有很好的应用前景。     

新苯并噻唑偶氮苯甲酸型显色剂的合成及其光度性能的研究(Ⅰ)

设计并合在民了５个新苯并噻唑偶氮苯甲酸型显色剂，用现代物理手段对试剂的结构进行了测定，研究了试剂的性质及６－Ｍｅ－ＢＴＡＭＢ与金属离子显色反应的光度特性。