Gel Running
Gel Running - Related Videos
11:03
Pouring and Running a Protein Gel by reusing Commercial Cassettes
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Cited by 2 •
2012
Our protocol demonstrates how to pour multiple protein gels at a time by recycling Invitrogen Nupage Novex minigel cassettes, and inexpensive materials purchased at a home improvement store. This economical and streamlined method includes a way to store the gels at 4°C for a few weeks. By re-using the plastic gel cassettes from commercially available gels, labs that run frequent protein gels can save significant costs and help the environment.
06:30
Gel Purification
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2023
Gel purification is used to recover DNA fragments after electrophoretic separation. DNA recovery from an agarose gel includes three basic steps: binding, washing and eluting from a silica column. DNA is believed to bind to silica in the presence of high salt via a salt bridge. Following binding, DNA is washed of impurities and eluted under low salt conditions disrupting this interaction. This video goes through a step-by-step, generalized procedure for cutting out a band from the gel, gel...
09:22
DNA Gel Electrophoresis
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2023
DNA gel electrophoresis is a technique used for the detection and separation of DNA molecules. An electric field is applied to a gel matrix comprised of agarose, and within the gel, charge particles will migrate and separate based on size. The negatively charged phosphates of the DNA backbone cause DNA fragments to move toward the anode - a positively charged electrode. The video explains the mechanism by which DNA fragments are resolved on an agarose gel, and it provides a step-by-step...
01:17
Wald-Wolfowitz Runs Test II
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2025
The Wald-Wolfowitz runs test, commonly referred to as the runs test, is a nonparametric test used to assess the randomness of ordered data. The test evaluates the number of runs, which are consecutive sequences of similar elements within the data. If the number of runs is significantly higher or lower than expected, the data is considered non-random, indicating a detectable pattern or structure. For binary data, runs are identified using symbols such as + and −, or equivalently, 1s and 0s. In...
07:31
Two-Dimensional Gel Electrophoresis
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2023
Two-dimensional gel electrophoresis (2DGE) is a technique that can resolve thousands of biomolecules from a mixture. This technique involves two distinct separation methods that have been coupled together: isoelectric focusing (IEF) and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). This physically separates compounds across two axes of a gel by their isoelectric points (an electrochemical property) and their molecular weights. The procedure in this video covers the main...
FAQs
Migration reflects several interacting variables rather than size alone. Molecular charge affects how a molecule responds to the electric field, while size and gel concentration influence movement through the matrix. Applied voltage also changes migration behavior. Considering these factors together helps explain why bands cannot be interpreted from molecular size alone.
Gel concentration is important because it determines characteristics of the porous path through which molecules migrate. Changing that concentration can alter how effectively molecules with different sizes separate, so the same sample may produce a different pattern under different gel conditions. Selecting an appropriate concentration therefore supports clearer comparisons between biological samples.
Visualization is a separate interpretive stage after molecules have migrated. Stains or fluorescent labels reveal the separated bands, converting otherwise unseen molecular positions into a pattern that can be examined. Researchers can then compare band locations with standards to estimate molecular size and inspect whether the sample contains the expected components.
DNA, RNA, and proteins can all be examined with gel running, but the biological question determines what the band pattern means. In one experiment, bands may support DNA fragment analysis; in another, they may help characterize proteins or examine gene expression. Thus, the technique provides a shared separation framework across different molecule types.
A basic workflow begins by allowing biological molecules to migrate under an applied electric field. Once separation is complete, the gel is exposed to a stain or fluorescent label so bands become visible. Those bands are compared with standards, allowing researchers to estimate molecular size and evaluate sample composition rather than relying on an unprocessed sample.
Standards provide a reference for interpreting band positions. By comparing the locations of sample bands with those of standards, researchers can estimate molecular size instead of simply recording that bands are present. This reference supports assessment when the goal is to verify a DNA fragment or characterize sample composition.
Gel running is useful when a biological workflow requires confirmation of molecular products. The method supports DNA fragment analysis, cloning workflows, protein characterization, gene expression studies, and verification of experimental results. In each case, the observed band pattern supplies evidence about sample composition or molecular size, helping researchers evaluate the result of an experiment.
In cloning workflows, separated bands can help verify DNA fragments, while in gene expression studies the resulting pattern contributes to analysis of biological samples. Protein characterization uses the same visible-band logic for a different molecule class. These applications connect the physical separation step to biological questions about fragment verification, expression-related analysis, and molecular composition.