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SYTOTM 9 Green Fluorescent Nucleic Acid Stain

Company: Invitrogen
Catalog#: S34854
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Determination of Antibacterial Activity of Film Coatings against Four Clinically Relevant Bacterial Strains
Author:
Date:
2021-01-20
[Abstract]  

Antibacterial coatings have currently gained great importance in biomedical technology investigations. Because of the spatial arrangement of the film coatings, evaluation of antibacterial activity presents a new challenge regarding traditional bacterial counting methods. In this protocol, four clinically relevant pathogens, Salmonella typhimurium, Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus were incubated on titania mesostructured thin film coatings for 24 h. Then, cell viability was studied considering three methods: counting of the number of colony forming units (CFU), live/dead staining, and quantification of extracellular DNA in suspension. Firstly, bacterial count was determined by the standard plate-count technique. Secondly, bacteria membrane integrity was

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[摘要]  [摘要]抗菌涂料目前在生物医学技术研究中具有重要意义。由于薄膜包衣的空间排列,抗菌活性的评估对传统的细菌计数方法提出了新的挑战。在此协议中,将四种临床相关病原体,鼠伤寒沙门氏菌,大肠杆菌,铜绿假单胞菌和金黄色葡萄球菌在二氧化钛介孔薄膜涂层上孵育24小时。然后,考虑三种方法研究细胞生存力:计数菌落形成单位(CFU)的数量,活/死染色以及悬浮液中细胞外DNA的定量。首先,通过标准的盘数技术确定细菌数。其次,通过利用两种荧光染料评估细菌膜的完​​整性,这两种荧光染料可以区分活细菌(完整的膜)和死细菌(破膜的)。最后,通过分光光度法定量细胞外DNA 。以这种方式,上述三种技术使得能够通过定性和定量分析研究细菌的生存力。

[背景]功能性涂料,由于他们提供的材料工程领域的宝贵优势被广泛研究。它们能够引入新的表面特性,而不会改变材料的体积特性。在它们的功能中,抗菌涂层对于生物医学应用已显示出极大的重要性(Mateescu等人,2015)。从这个意义上讲,纳米技术提供了制造抗菌涂层的重要工具。我们的小组已经实现了具有广谱杀菌活性的纳米结构涂层的合成,而没有利用抗生素或排斥细菌的物质(Scilletta et al。,2019)。在这里,只有个êSUP ...

Colorimetric RT-LAMP Methods to Detect Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2)
Author:
Date:
2020-11-05
[Abstract]  Standard diagnostic methods of Coronavirus Disease 2019 (COVID-19) rely on RT-qPCR technique which have limited point-of-care test (POCT) potential due to necessity of dedicated equipment and specialized personnel. LAMP, an isothermal nucleic acid amplification test (NAAT), is a promising technique that may substitute RT-qPCR for POCT of genomic materials. Here, we provide a protocol to perform reverse transcription LAMP targeting SARS-CoV-2. We adopted both real-time fluorescence detection and end-point colorimetric detection approaches. Our protocol would be useful for screening diagnosis of COVID-19 and be a baseline for development of improved POCT NAAT. [摘要]  [摘要] 2019年冠状病毒病的标准诊断方法(COVID-19)依靠RT-qPCR技术,由于需要专用设备和专门人员,因此具有有限的即时检验(POCT)潜力。LAMP是一种等温核酸扩增测试(NAAT),是一种有前途的技术,可以用RT-qPCR代替基因组材料的POCT。在这里,我们提供了一种执行针对SARS-CoV-2的逆转录LAMP的协议。我们同时采用了实时荧光检测和终点比色检测方法。我们的协议对于筛查COVID-19的诊断将是有用的,并且是开发改进的POCT NAAT的基线。

[背景]快速和SARS-CoV的-2,COVID-19的病原的灵敏检测,重要的是要控制电流大流行的情况,因为它使得早期检测,隔离和治疗以及监测筛选。按照世界卫生组织的建议,当前用于检测SARS-CoV-2的标准方法采用RT-qPCR (世界卫生组织,2020年)。然而,RT-qPCR诊断的正确执行需要高水平的设施和专家,通常在医院/采样场所无法获得,因此缺乏POCT适用性。


由于等温扩增方法可以用相对简单的仪器进行检测,因此开发了等温扩增方法以通过在各种现场即时检测核酸来完成诊断(Niemz et ...

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