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last updated: January 14, 2020
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Isolating pure DNA is key to many downstream applications for molecular biologists. Isolating large quantities of pure DNA used to be a laborious task. But thanks to commercially available kits, older methods have been streamlined to allow efficient recovery of pure DNA. In this article, I will talk about a method called DNA gel extraction,…
The reverse transcription (RT) step of RT-PCR for converting RNA to cDNA is critical for accuracy in quantification and for finding low copy messages. Thus, you want to make sure that this step is performed with the highest efficiency but without having to optimize every single step. To help you further in optimizing the RT…
Resistance to the antibiotic ampicillin is commonly used as a selection marker for plasmids in gene cloning and protein expression in E.coli and other bacteria. While it can be incredibly useful tool, there can be problems using this selection marker that you need to be aware of if if you plan on using it. This…
Some techniques can sound very dry but this isn’t one of them! SAGE was first described and published by Velculescu et al. in 1995. At the time, techniques like RNA blotting and expressed sequence tagging were used to study gene expression. However techniques like these were slow and very limited. The speed of SAGE and…
Plasmids—the loops of DNA in bacteria that form the original foundation of biotechnology—were being discovered constantly in the 1940s and 1950s. The only problem was, they were called everything but. Series of scientists found bacteriophages and other strange loops of somatic DNA, and gave them a series of names, including: pangenes, bioblasts, plasmagenes, plastogenes, choncriogenes,…
RNA purification may be a common procedure in molecular biology but it is by far the one that people fear most. Why? Dreaded RNase. It’s everywhere… all over your bench and pipettes, and floating in the air, waiting for the chance to creep into your prep, shred your RNA into nucleotides, and ruin a day’s…
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