Glycerol Gradient
Glycerol Gradient - Related Videos
02:35
Long-Term Cryopreservation of Cyanobacterial Strains Using Glycerol or Dimethyl Sulfoxide
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2025
Source: Lea-Smith, D. J., et al. Generation of Marked and Markerless Mutants in Model Cyanobacterial Species. J. Vis. Exp. (2016)This video demonstrates the cryopreservation of cyanobacterial strains by combining concentrated cell suspensions with glycerol or DMSO and storing them at low temperatures, enabling long-term maintenance of viable cultures for photosynthesis and genetic studies.
07:24
In Vitro Disassembly of Influenza A Virus Capsids by Gradient Centrifugation
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Cited by 4 •
2016
Disassembly of influenza A virus cores during virus entry into host cells is a multistep process. We describe an in vitro method to analyze the early stages of viral uncoating. In this approach, velocity gradient centrifugation is used to biochemically dissect the steps that initiate uncoating under defined conditions.
08:42
Density Gradient Ultracentrifugation
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2023
Density gradient ultracentrifugation is a common technique used to isolate and purify biomolecules and cell structures. This technique exploits the fact that, in suspension, particles that are more dense than the solvent will sediment, while those that are less dense will float. A high-speed ultracentrifuge is used to accelerate this process in order to separate biomolecules within a density gradient, which can be established by layering liquids of decreasing density in a centrifuge tube. The...
02:42
In Vitro Disassembly of the Influenza A Virus Core Using pH-Controlled Gradient Centrifugation
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2026
Source: Stauffer, S. et al. In Vitro Disassembly of Influenza A Virus Capsids by Gradient Centrifugation. J. Vis. Exp. (2016)This video demonstrates the pH-dependent disassembly of influenza A virus (IAV) cores using gradient ultracentrifugation. It outlines glycerol gradient preparation, ultracentrifugation, and how different pH conditions affect IAV core disassembly.
13:02
Archimedes-Based Glycerol Displacement for Electrode Porosity Measurement in Lead-Acid Batteries
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2026
Here, we present a simple and low-cost glycerol displacement method based on Archimedes' principle for measuring lead-acid battery electrode porosities. The method demonstrates good reproducibility and is safer than traditional techniques, requiring low-hazard chemicals and equipment. Combining the technique with microstructural analysis by X-ray diffraction provides information on battery electrode properties and degradation.
FAQs
Migration through the gradient reflects sedimentation behavior, which depends on a particle’s size, shape, and density. These properties cause different biological particles or macromolecular complexes to move at different rates during ultracentrifugation. As a result, components that differ physically can separate into distinct fractions for subsequent biochemical analysis.
Each property affects how rapidly a particle migrates through the glycerol medium. Differences in size can alter movement, while shape and density also contribute to distinct sedimentation behavior. Considering these variables helps researchers interpret whether separated fractions represent different particles, altered assemblies, or changes in the organization of a complex.
A continuous glycerol gradient provides a range of densities through which particles migrate rather than forcing all components into a single separation boundary. This supports resolution of complexes with different sedimentation behaviors and produces multiple fractions. Comparing those fractions can help reveal differences in molecular composition and complex organization.
Researchers place the biological sample onto a continuous glycerol gradient and subject it to ultracentrifugation. Particles then migrate through the gradient at rates determined by their sedimentation behavior. After separation, the gradient is divided into distinct fractions, which can be analyzed to determine the distribution and composition of the separated components.
Analyzing the resulting fractions can reveal which molecular components occur together, how biological particles are distributed, and whether a complex has a particular organization. In neuroscience research, these patterns can provide evidence about molecular composition, interactions, and changes in assemblies associated with neuronal signaling or neurotransmission.
Neuroscience studies use this approach to examine synaptic vesicles, protein assemblies, ribonucleoprotein complexes, and other subcellular components. Fractionation helps investigators compare their sedimentation patterns and molecular composition. These measurements support research on neurotransmission, neuronal signaling, and the biochemical mechanisms that contribute to nervous-system function.