Buoyancy Assay
Buoyancy Assay - Related Videos
11:30
Buoyancy and Drag on Immersed Bodies
0 Views •
2023
Source: Alexander S Rattner and Sanjay Adhikari; Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA Objects, vehicles, and organisms immersed in fluid mediums experience forces from the surrounding fluid in the form of buoyancy- a vertical upward force due to fluid weight, drag- a resistive force opposite the direction of motion, and lift- a force perpendicular to the direction of motion. Prediction and characterization of these forces is...
01:12
Buoyancy
0 Views •
2025
When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy. The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the fluid? To get...
03:18
Flotation-Based T Cell Isolation Using Buoyancy-Activated Cell Sorting
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2025
This video demonstrates T cell isolation from peripheral blood mononuclear cells (PBMCs) using the functionalized buoyancy-activated cell sorting (BACS) technology. The isolation technique involves the positive selection of CD3+ T cells by labeling the cells with biotinylated anti-CD3 antibodies and separating the antibody-bound cells using streptavidin-bound microbubbles.
08:00
A Buoyancy-based Method of Determining Fat Levels in Drosophila
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Cited by 19 •
2016
Here we present a method to measure organismal fat levels in the third instar (L3) larval stage of Drosophila melanogaster. This method exploits the comparatively low density of fat tissue to differentiate between larvae with altered fat stores. Buoyancy-based analysis is a valuable tool for rapid, reproducible, and economical screening.
01:11
Buoyancy and Stability for Submerged and Floating Bodies
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2025
In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
FAQs
The outcome depends on a density comparison, not simply on the sample’s size. When the sample’s buoyant density is lower than that of the surrounding fluid, it moves upward; when higher, it moves downward. If the two densities balance, the sample reaches equilibrium. This relationship lets researchers interpret movement as evidence about sample composition or structural state.
Density gradients create a continuous range of surrounding densities, allowing samples with different buoyant densities to separate rather than merely being classified as floating or sinking. Centrifugation enhances this process by driving material through the fluid. The resulting distribution can help distinguish cells, organelles, particles, or other biological samples according to density-related differences.
Changes in a sample can alter its buoyant density and therefore its behavior in the assay. Lipid accumulation is one example, while macromolecular assembly is another. Tracking shifts in flotation, sinking, or equilibrium provides a way to study these processes indirectly, because the movement pattern reflects a change in the physical properties of the biological material.
A basic workflow begins by placing the biological material in a fluid and examining whether it floats, sinks, or reaches equilibrium. For finer separation, researchers can introduce a density gradient and use centrifugation, then analyze how the sample moves through the medium. The setup can therefore support direct comparison, characterization, or isolation of biological material.
Buoyancy assays can support isolation of cellular components by separating material according to density. They also help characterize particles and assess changes in cell or tissue composition. These uses make the approach relevant when researchers need to compare biological samples or isolate a component whose density differs from surrounding material.
In biology, the method connects physical behavior in fluids with questions about cell and tissue composition. It can be applied in cell biology, biochemistry, developmental research, and analysis of biological materials. Results may indicate density changes associated with lipid accumulation or macromolecular assembly, linking an observable separation pattern to an underlying biological process.