Weight-based Separation
Weight-based Separation - Related Videos
03:10
Sodium Dodecyl Sulphate Polyacrylamide Gel Electrophoresis for Protein Analysis: A Technique to Separate and Visualize Proteins Based on Molecular Weight
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2025
This video demonstrates a denaturing polyacrylamide-based separation technique for proteins. This technique helps in the preliminary identification of proteins based on their molecular weights.
07:37
Two-Dimensional Polyacrylamide Gel Electrophoresis: A Separation Technique for Analysis of Proteins in Complex Protein Mixture Based on Charge and Molecular Weight
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2025
In this video, we demonstrate a two-dimensional gel electrophoresis method that separates individual proteins from a complex protein mixture obtained from tumor tissues of human nonfunctional pituitary adenoma (NFPA). The proteins are separated based on their electric charge in the first dimension and further separated based on molecular weights in the second dimension.
00:57
Weighted Mean
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2023
While taking the arithmetic, geometric, or harmonic mean of a sample data set, equal importance is assigned to all the data points. However, all the values may not always be equally important in some data sets. An intrinsic bias might make it more important to give more weightage to specific values over others. For example, consider the number of goals scored in the matches of a tournament. While computing the average number of goals scored in the tournament, it may be more important to...
07:29
Separating Protein with SDS-PAGE
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2023
Sodium Dodecyl Sulfate Poly-Acrylamide Gel Electrophoresis, or SDS-PAGE, is a widely-used technique for separating mixtures of proteins based on their size and nothing else. SDS, an anionic detergent, is used to produce an even charge across the length of proteins that have been linearized. By first loading them into a gel made of polyacrylamide and then applying an electric field to the gel, SDS-coated proteins are then separated. The electric field acts as the driving force, drawing the SDS...
01:19
Mass and Weight
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2023
Mass and weight are often used interchangeably in everyday conversation. For example, medical records often show our weight in kilograms, but never in the correct units of newtons. In physics, however, there is an important distinction. Weight is the pull of the Earth on an object. It depends on the distance from the center of the Earth. Weight dramatically varies if we leave the Earth's surface, unlike mass, which does not vary with location. On the Moon, for example, the acceleration due to...
FAQs
The decisive factor is how each component responds to the surrounding fluid and the applied force. Differences in mass or density produce different effective movements, while buoyant behavior affects whether a particle tends to move downward or remain suspended. These contrasts allow components in a complex biological mixture to separate without requiring a chemical change in their composition.
A fluid provides the medium through which cells, organelles, tissue fragments, or other particles move. Components traveling through that medium at different rates become spatially separated, with some sedimenting and others remaining suspended. Consequently, the separation outcome depends not only on particle properties but also on how those properties interact with the surrounding fluid.
Both methods exploit differential movement, but they provide different driving conditions. Settling relies on gravity, whereas centrifugation applies a centrifugal field that changes the effective force acting on the mixture. This distinction gives bioengineers alternative ways to process particulate biological materials, depending on whether simple gravitational movement or an applied field better suits the intended isolation workflow.
A typical workflow begins with a heterogeneous biological mixture and places it under a selected driving condition, such as gravity or an applied centrifugal field. Components then move through the fluid at different rates. Once this differential movement produces separation, the resulting portions can support isolation of particulate materials for subsequent processing or analysis.
This approach is useful when a sample contains particulate biological materials with different physical behaviors. Bioengineers can apply it to isolate cells, organelles, tissue fragments, and related materials during sample preparation or cell processing. Its physical basis also makes it relevant to downstream analysis, where separated components need to be examined individually or handled in distinct processing streams.
Weight-based separation can produce prepared or isolated biological material for downstream analysis and cell-processing workflows. It also contributes to scalable biomanufacturing by providing a physical strategy for handling complex mixtures. The resulting separations help connect early sample processing with later analytical or production steps, particularly when the target materials are particulate and differ in movement through a fluid.