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I am currently using a recombinant protein which shows metal-dependent DNase activity. Is it possible to pinpoint the source of the DNase activity after protein purification? More specifically, can I ensure that the DNase activity is not because of nuclease contamination from the E.coli that might have persisted and passed with the protein of interest during purification?

Get tips on using IMAGEN™ Influenza Virus A and B Kit using Direct Immunofluorescence Assay to perform Cell Culture Contamination Detection Kit Virus

Get tips on using MHC Class II (I-A/I-E) Monoclonal Antibody (M5/114.15.2), FITC, eBioscience™ to perform Flow cytometry Anti-bodies Mouse - MHCII

Get tips on using MHC Class II (I-A/I-E) Monoclonal Antibody (M5/114.15.2), eFluor 450, eBioscience™ to perform Flow cytometry Anti-bodies Mouse - MHCII

I would like to excise a large strand of DNA and insert a new one using CRISPR. My problem is that my strand will be a little over 1kb and I am not sure if this is going to be a limiting factor. Also, how long should the homology arms be for a region of this size?

I have been doing multiplex PCR and qPCR separately. Is there a way to combine them in a single reaction using Sybr Green?

I used a serum/plasma kit for my serum samples. After the phase separation the samples should have 3 phases: a colourless aqueous phase, a white interphase and a red organic phase. However, in some of my samples there was no aqueous phase unless I wait for an extended period of time. How can I circumvent this problem?

which is a good monoclonal anibody for this protein?

I would like to regulate the expression of a gene and in order to do that, I have purchased specific siRNA. After optimizing my transfection protocol and using electroporation I have achieved a 60-70% reduction of the gene of interest. However, I cannot observe a significant reduction of mRNA expression but only a reduction of protein. What might be the problem? Could the problem be in my cell treatment method?

Western blotting is a widely used technique to size separate proteins from a pool of cell or tissue lysates. The technique has 4 major steps: a) gel electrophoresis, b) blocking and treatment with antigen specific antibody, c) treatment with secondary antibody and finally d) detection and visualization. Though western blotting is a widely used technique, detection of specific proteins depends on several factors, the major ones are antibody concentration, incubation time and washing steps. Key points for obtaining clean blots are: always prepare fresh buffer solutions and optimize antibody concentration. Given the advent of high-throughput protein analysis and a push to limit the use of lab consumables, onestep antibodies are developed which recognise protein of interest and also contain a detection label.