Molecular Gradient
Molecular Gradient - Related Videos
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...
10:52
Denaturing Gradient Gel Electrophoresis (DGGE)
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Cited by 10 •
2007
06:54
MR Molecular Imaging of Prostate Cancer with a Small Molecular CLT1 Peptide Targeted Contrast Agent
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Cited by 3 •
2013
To demonstrate MR cancer molecular imaging with a small peptide targeted MRI contrast agent specific to clotted plasma proteins in tumor stroma in a mouse prostate cancer model.
03:36
Purification of Bacteriophages Using a Sucrose Density Gradient
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2026
Source: Rustad, M., et.al. Synthesis of Infectious Bacteriophages in an E. coli-based Cell-free Expression System. J. Vis. Exp. (2017)This video demonstrates the purification of bacteriophages from a suspension containing host bacterial debris using a sucrose density gradient. It shows how the density gradient separates phages by buoyant density, enabling recovery of a visible band for resuspension and further analysis.
02:15
Density Gradient Purification of Cyanobacterial Plastoglobules
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2025
Source: Shivaiah, K., et al. Plastoglobule Lipid Droplet Isolation from Plant Leaf Tissue and Cyanobacteria. J. Vis. Exp. (2022).This video demonstrates the isolation of plastoglobules from cyanobacteria using sucrose density gradient centrifugation, highlighting their lipid-rich, low-density nature and ensuring their structural preservation for downstream analysis.
FAQs
Their spatial profiles depend on several coordinated processes: localized production places the signaling molecule in a restricted region, while diffusion or transport spreads it. Degradation removes signal, and binding to extracellular components can limit or organize its movement. The resulting balance determines which cells encounter particular concentrations and preserves positional information across the tissue.
Receptors detect the local concentration of a signaling molecule and translate that information into cellular responses. Different concentration levels can activate distinct gene-expression programs or behaviors, allowing neighboring cells exposed to the same molecular source to adopt different outcomes. This concentration-dependent interpretation is central to assigning positional identities during neural development.
Binding to extracellular components can influence how far a signaling molecule moves and where it remains available to cells. This mechanism works alongside production, diffusion, transport, and degradation to shape the signal's spatial distribution. Consequently, extracellular interactions help determine which neural cells receive a concentration sufficient to trigger a particular developmental response.
During nervous system development, cells in different positions along the neural tube can experience different signal concentrations. Receptor-mediated interpretation of those differences activates distinct gene-expression programs, helping organize neuronal identities across the developing structure. Studying these patterns links the distribution of signaling molecules with the regional organization needed to form complex neural tissue.
Growing axons can respond to spatially varying signaling molecules as they extend through developing neural tissue. Because receptor interpretation depends on local concentration, changing signal levels can influence axonal behavior and help organize connections. This makes gradients relevant not only to identifying neural cells, but also to establishing the pathways through which developing neurons connect.
Gradient research reveals how concentration-dependent signals organize neural identities and connections during development. That knowledge can guide strategies for directing stem cells toward particular neural outcomes and can provide a framework for understanding developmental disorders. The same principles also make gradients relevant to neural repair, where recreating positional or guidance cues may be important.