分子实验室探针在生化分析中的应用研究进展

分子实验室探针（lab-on-a-molecule probe）是基于分子级别的检测,能够提供空间高密度的感应信号,其主要分为分子逻辑门、分子多模式检测以及兼具2者功能的探针,该探针在多分析物的定性以及竞争分析的定量灵敏检测中发挥了重要的作用。对上述3类探针在生化分析（金属阳离子、无机阴离子、氨基酸、蛋白质、致病菌等）中的应用进行了总结。     

Enhancement of thermoelectric properties of SrTiO_3/LaNb–SrTiO_3 composite by different doping levels

Strontium titanate(STO)is an n-type oxide thermoelectric material,which has shown great prospects in recent years.The doping of La and Nb into STO can improve its power factor,whereas its thermal conductivity is still very high.Thus,in order to obtain a high thermoelectric figure-of-merit z T,it is very important to reduce its thermal conductivity.In this paper,using a combination of a hydrothermal method and a high-efficiency sintering method,we succeed in preparing a composite of pure STO and La Nb-doped STO,which simultaneously realizes lower thermal conductivity and higherSeebeck coefficient,therefore,the thermoelectric properties of STO are significantly improved.In the SrTiO_3/La Nb–SrTiO_3 bulk samples,the lowest thermal conductivity is 2.57 W·m~(-1)·K~(-1)and the highest z T is 0.35 at 1000 K for the STO/La_(10)Nb_(20)–STO sample.     

多囊卵巢综合征相关雄性激素的液相色谱-串联质谱检测

建立了液相色谱-串联质谱(LC-MS/MS)检测血清中硫酸脱氢表雄酮(DHEAS)、雄烯二酮(A4)、睾酮(T)、17-羟基孕酮(17-OHP)、双氢睾酮(DHT)5种激素的分析方法。血清样本经蛋白沉淀后,采用固相萃取,经Agela Venusil MP C18色谱柱(3.0 mm×50 mm,3μm)分离,以含0.1%甲酸的甲醇和含0.02%甲酸的水为流动相进行梯度洗脱。使用正-负离子多反应监测模式进行数据采集。结果表明,5种激素在各自质量浓度范围内线性关系良好(r2>0.995),回收率为96.0%~105%,各激素的批内精密度和批间精密度均小于10%,DHEAS、A4、T、17-OHP、DHT的定量下限(LOQ)分别为5.00、0.05、0.05、0.025、0.025 ng/mL。该方法快速、准确、灵敏,适用于临床对多囊卵巢综合征(PCOS)患者血清雄性激素水平的检测。