Immunochemical tools for mycotoxin detection in food

Abstract  As a result of the deleterious effects of mycotoxins on human and animal health, and the consequently increasing stringency in the determination of food contamination levels, many researchers have focused their efforts on developing new devices for the detection of these compounds. Biosensors merit special mention due to their sensitivity, accuracy, cost-effectiveness and simplicity, not only of the construction, but also of the sample pre-treatment, if necessary, and the measurement step. Furthermore, biosensor arrays offer additional advantages, such as the possibility to measure multiple samples and provide multi-mycotoxin profiles in one assay. In this case, apart from shortening the analysis time, accuracy is improved by the assessment of matrix interferences and synergistic effects among mycotoxins. Biosensors and arrays for mycotoxins are thus promising biotechnological tools for mycotoxin detection in food. Graphical Abstract        

彩色膜的研制

本文介绍了彩色膜的功能和制作原理。简略介绍了制作工艺和结构。从理论和实际两方面比较了制作膜的透射率-波长关系。     

Large-scale CdX (X=S, Se) microtube arrays on glass substrate: transformation of CdOHCl microrod arrays by a simple template-sacrificing solution method

Large-scale arrayed CdX (X=S, Se) microtubes have been successfully prepared on glass substrate by a simple solution route. In this process, cadmium hydroxyl chloride (CdOHCl) microrod arrays, which could be directly grown on glass surface in solution of CdCl₂ and methenamine, were used not only as a source of cadmium but also as a new reactive template to fabricate these highly ordered cadmium chalcogenide tube arrays, and the orientation of CdOHCl microrods on glass substrate could be easily achieved by pretreating the glass surface with appropriate concentration of NaOH aqueous solution. The transformation from arrayed CdOHCl rods to CdS and CdSe microtube arrays were conducted in thioacetamide and Na₂SeSO₃ solution, respectively. The conversion was convenient, and no CdOHCl crystallites were detected in the final products measured by X-ray powder diffraction. The hexagonal prismatic morphology and orientation of CdOHCl rods were perfectly maintained in the as-prepared cadmium chalcogenide films according to scanning electron microscopy. Transmission electron microscopy was used to further characterize these microtube structures. The effect of NaOH pretreatment on CdOHCl orientation and the formation of tubular structures were also discussed.     

基于FPGA的快速全场光学相干层析方法

针对全场光学相干层析术实用化时成像速度不高的问题,提出一种基于FPGA控制的相位调制快速全场光学相干层析系统成像方法.首先用FPGA搭建电路以产生频率可调的高准确度正弦信号与脉冲信号,然后利用所产生的信号作为调制频率,采用四步移相法获取光学断层图像.采用该方法对洋葱表皮细胞进行光学断层成像,并与传统相移法及采用单片机调制方式获取的图像进行对比,结果表明该方法不仅能提高成像质量,且对高分辨率光学断层图像的采集时间从目前的4s(0.25 Hz)减少到0.03~0.05s(20Hz~35Hz),提高了系统的成像速度.     

中值滤波器的FPGA实现方案

为了满足红外跟踪系统中对预处理越来越高的实时性要求,本文提出了一种基于现场可编程逻辑门阵列（FPGA）的中值滤波器.文中首先分析了当今FPGA发展的特点和优势;并对设计所用的FPGA芯片XC2V1000的结构特点进行研究;具体讨论了中值滤波在FPGA中的实现.结果证明方案可行,滤波具有良好的实时效果.     

三角组列的完全收敛性

设 {Xi,i≥ 1 }为独立同分布的随机变量序列 ,h为 R2→R的实可测函数 .考虑三角组列 un=∑i相似文献   

FPGA器件设计技术发展综述

现场可编程门阵列(Field Programmable Gate Array,FPGA)作为一种可编程逻辑器件,在短短二十多年里从电子设计的外围器件逐渐演变为数字系统的核心,在计算机硬件、通信、航空航天和汽车电子等诸多领域有着广泛的应用。伴随着半导体工艺技术的进步,FPGA器件的设计技术取得了飞跃性突破。该文在回顾FPGA发展历史的同时,对目前主流FPGA器件的前沿技术进行总结,并对新一代FPGA的发展前景进行展望。     

行为NA的随机变量阵列加权和的Lr收敛性

{Xni,1 i Kn↑∞,n 1}为行为NA的随机变量阵列,{ani,1 i Kn↑∞,n 1}为实数阵列,研究了∑Kni=1aniXni的Lr收敛性.     

Application of Wet Chemical Etching in Fabrication Process of GaAs/AlGaAs Quantum Dot Arrays

Ｌｏｗｄｉｍｅｎｓｉｏｎａｌｓｔｒｕｃｔｕｒｅｓ,ｓｕｃｈａｓｑｕａｎｔｕｍｗｅｌｌ（ＱＷ）,ｑｕａｎｔｕｍｗｉｒｅ（ＱＷＲ）ａｎｄｑｕａｎｔｕｍｄｏｔ（ＱＤ）ｈａｖｅａｔｔｒａｃｔｅｄｍｏｒｅａｎｄｍｏｒｅａｔｔｅｎｔｉ...