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Dictionary » E » Electrophoresis ElectrophoresisElectrophoresis (Science: technique) separation of ionic molecules, (principally proteins) by the differential migration through a gel according to the size and ionic charge of the molecules in an electrical field. High resolution techniques normally use a gel support for the fluid phase. Examples of gels used are starch, acrylamide, agarose or mixtures of acrylamide and agarose. Frictional resistance produced by the support causes size, rather than charge alone, to become the major determinant of separation. Smaller molecules with a more negative charge will travel faster and further through the gel toward the anode of an electrophoretic cell when high voltage is applied. Similar molecules will group on the gel. They may be visualised by staining and quantitated, in relative terms, using densitometers which continuously monitor the photometric density of the resulting stain. The electrolyte may be continuous (a single buffer) or discontinuous, where a sample is stacked by means of a buffer discontinuity, before it enters the running gel/ running buffer. The gel may be a single concentration or gradient in which pore size decreases with migration distance. in sds gel electrophoresis of proteins or electrophoresis of polynucleotides, mobility depends primarily on size and is used to determined molecular weight. In pulse field electrophoresis, two fields are applied alternately at right angles to each other to minimise diffusion mediated spread of large linear polymers. ![]()
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Results from our forumGenetic diversity on squirrelsHow different about DNA amplified band and polymorphic band? I would like to calcualte %of polymorphic band after PCR and electrophoresis, please explian. Thank you very much
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Re: PCR & Agarose gel electrophoresisHi! Could you describe the experiment more detailed? where do the primers anneal? why are there two bands? did you use more than 2 primers? which polymerase did you use (proofreading or not)? does a primer anneal to the mutated site? I don't think that contamination is the explanation to that. I'd e...
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PCR & Agarose gel electrophoresisHi there, I have been trying to determine the genotype of some cell samples using PCR and agaorse gel electrophoresis. On one of the samples, I was supposed to find two bands representing a heterozygote for a particular mutated receptor but I could only see one band representing ...
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Cell lysis and Lowry assay for 2D electrophoresisHello, I want to perform a 2D electrophoresis on my neuronal cells and wanted to get your feedback on some of my questions: 1)Can I use my 2D sample buffer: 8M Urea, 2% w/v CHAPS 50mM DTT 0.2% w/v100X Bio-Lyte ampholyte 0.002% w/v BPB for ...
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Re: Gel electrophoresisNot exactly sure, but I think gel electrophoresis is a method of obtaining like a DNA map. So, if you look at it from the stance of law/justice, it could be to determine if a certain piece of evidence is linked to a certain suspect, etc. Hope ...
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