Spatial Gradients
Spatial Gradients - 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...
08:52
Spatial Molecular Imaging of the Glycome Using Mass Spectrometry
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Cited by 2 •
2025
This protocol details the key steps to enable rigorous and reproducible measurement of both glycogen and N-linked glycans using mass spectrometry imaging.
07:51
Spatial Cueing
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University Attention refers to the limited human ability to select some information for processing at the expense of other stimuli in the environment. Attention operates in all sensory modalities: vision, hearing, touch, even taste and smell. It is most often studied in the visual domain though. A common way to study visual attention is with a spatial cueing paradigm. This paradigm allows researchers to measure the consequences of focusing...
10:37
Spatial Separation of Molecular Conformers and Clusters
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Cited by 3 •
2014
We present a technique that allows the spatial separation of different conformers or clusters present in a molecular beam. An electrostatic deflector is used to separate species by their mass-to-dipole moment ratio, leading to the production of gas-phase ensembles of a single conformer or cluster stoichiometry.
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.
FAQs
A source adds an environmental property to an area, whereas a sink removes or absorbs it. Their locations and strengths can produce uneven concentrations of heat, nutrients, moisture, or pollution. Transport processes then redistribute these properties, so the observed pattern reflects the combined effects of local inputs, removals, movement, and surrounding landscape structure.
Diffusion spreads a property from areas of higher concentration toward areas of lower concentration, while advection moves it with a flowing medium. Biological uptake can remove nutrients or other substances from the environment. Together, these processes determine whether conditions change sharply over short distances or gradually across a broader area.
Landscape features can redirect transport, restrict movement, or create localized sources and sinks. As a result, the same environmental property may vary differently across distinct parts of an area. These spatial differences help explain why organisms encounter contrasting conditions and why ecological niches, habitat quality, and contaminant patterns may be concentrated in particular locations.
Gradients expose the range of conditions available to organisms rather than treating an environment as uniform. Changes in temperature, light, moisture, nutrients, or pollution can therefore correspond to shifts in ecological niches and habitat quality. Mapping those changes helps researchers assess how organisms and ecosystems may respond to environmental change across space.
Researchers can characterize spatial patterns through field sampling, remote sensing, or spatial models. Field sampling provides measurements at selected locations, remote sensing captures environmental variation across mapped areas, and spatial models represent patterns across space. Used appropriately, these approaches support the identification and visualization of changing environmental conditions.
A mapped gradient can show where environmental conditions are concentrated, where they decline, and how rapidly they change with distance. Such patterns can help identify ecological niches, evaluate habitat quality, and trace the movement or distribution of contaminants. The resulting spatial information connects measured environmental variation with locations of ecological or management importance.
Conservation planning can use spatial gradients to locate areas with suitable environmental conditions and to recognize regions where habitat quality varies. Patterns of temperature, moisture, nutrients, light, or pollution may indicate different ecological conditions across a landscape. This information supports decisions about where conservation attention or environmental management may be most needed.
Pollution gradients provide a spatial basis for examining how contamination varies across an area and for tracing its movement. Their patterns can reveal relationships between pollutant sources, transport processes, and affected locations. Managers and researchers can use this information to assess environmental conditions, identify areas of concern, and evaluate how ecosystems may be exposed to change.