聚合酶链反应

Rapid detection of sepsis in rats through volatile organic compounds in breath.

ty10086 提交于 周四, 08/26/2021 - 12:58
Sepsis is one of the main causes of death in adult intensive care units. The major drawbacks of the different methods used for its diagnosis and monitoring are their inability to provide fast responses and unsuitability for bedside use. In this study, performed using a rat sepsis model, we evaluate breath analysis with Ion Mobility Spectrometry (IMS) as a fast, portable and non-invasive strategy.;This study was carried out on 20 Sprague-Dawley rats. Ten rats were injected with lipopolysaccharide from Escherichia coli and ten rats were IP injected with regular saline.

Fabrication and characterization of a flow-through PCR device with integrated chromium resistive heaters

ty10086 提交于 周四, 08/26/2021 - 12:55
Abstract\n\t\t\t\t\n\t\t\t\t\tA flow-through PCR device with integrated chromium resistive heaters was developed. The PCR device was composed of a polydimethylsiloxane flow channel chip fabricated using soft lithography and a glass heating chip produced by standard photolithography. PDMS bonding layers were used to assemble the device instead of oxygen plasma treatment. The formation of air bubbles within the device was suppressed by treating the flow channel with 20% (v/v) Tween 20.

低成本、开源的化工分离策略

ty10086 提交于 周三, 08/25/2021 - 16:28
近年来,一种利用开放存取资源进行实验室研究的趋势已经开始。科学硬件的开源设计策略依赖于使用广泛可用的部件,特别是那些可以直接打印的部件,使用可与低成本微控制器连接的可加性制造技术和电子元件。开源软件消除了昂贵商业许可证的需要,提供了针对特定需求设计程序的机会。本综述对化学分离领域内的“开源运动”的影响进行了描述,主要是通过对近5年来该领域的研究进行全面的考察。涵盖的主题包括一般实验室设备、样品制备技术、基于分离的分析、检测策略、电子系统控制和数据处理软件。还讨论了在这些与分离有关的专题中继续存在的障碍和进一步采用开源办法的可能机会。

集成无泵微流控芯片,用于聚合酶链反应和电化学分析检测食源性致病菌

ty10086 提交于 周三, 08/25/2021 - 16:03
由于食物中毒增加了人们对公共卫生的兴趣,对一种新的病原体评价监测系统的研究也得到了显著的探索。本研究通过集成基于薄膜的PCR模块、电极模块和基于聚二甲基硅氧烷( PDMS )的手指驱动微流控模块,建立了简单的单片机病原分析系统。采用薄膜式PCR模块和电极模块进行基因扩增和电化学分析,采用PDMS手指驱动微流控模块进行样品迁移和混合,可替代外部泵送系统。集成的无泵微流控芯片包含三个平行的微流控通道,用于同时分析多个样品中的病原体,通道通过按下按钮而无需外部泵浦系统。采用集成无泵微流控芯片,在膜室中采用热循环聚合酶链反应( PCR )方法扩增食源性致病菌的目的基因,并采用方波伏安法对扩增基因进行电化学定量。以大肠杆菌O157:H7为目标病原菌,对其进行敏感评价,检测限( LOD )为10 2个集落形成单位( CFU ),鉴于集成微流控芯片的显著特点,所开发的传感平台可作为一种有前途的病原学筛查工具应用于护理点检测领域。