Rolling Flux
Rolling Flux - Related Videos
01:09
Rolling Without Slipping
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2023
People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is essential...
01:14
Rolling With Slipping
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2025
Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface. An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can affect...
01:21
Rolling Resistance
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2023
When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures. For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down due to...
09:05
Measurements of CO2 Fluxes at Non-Ideal Eddy Covariance Sites
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2019
The presented protocol uses the eddy covariance method at non-typical locations, applicable to all types of short-canopy ecosystems with limited area, on a currently reforested windthrow site in Poland. Details of measuring site setup rules, flux calculations and quality control, and final result analysis, are described.
01:15
Electric Flux
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2025
The concept of flux describes how much of something goes through a given area. More formally, it is the dot product of a vector field within an area. For a better understanding, consider an open rectangular surface with a small area that is placed in a uniform electric field. The larger the area, the more field lines go through it and, hence, the greater the flux; similarly, the stronger the electric field (represented by a greater density of lines), the greater the flux. On the other hand, if...
FAQs
Endothelial selectins bind ligands on passing leukocytes through bonds that form and break rapidly under shear. This repeated turnover prevents immediate detachment while also preventing stable arrest, so cells become tethered, slow down, and continue moving along the endothelial surface. Rolling flux therefore reflects the coordinated mechanical behavior of these transient adhesion interactions.
Shear provides the physical force that repeatedly challenges leukocyte-endothelial bonds. Its presence distinguishes rolling from simple cell contact: interactions must persist long enough to slow a leukocyte while still allowing movement. Because rolling flux is measured under flowing conditions, it reports adhesion behavior in a setting that includes the mechanical demands of vascular circulation.
A change in rolling flux indicates that the frequency of leukocytes passing a defined endothelial location has been altered. In immunology and infection studies, this provides an early readout of how inflammation, infection, or treatment affects leukocyte-endothelial interactions. The measurement helps connect changes at the vascular interface with subsequent immune-cell trafficking toward tissue.
Researchers first establish a defined observation point and a measurement interval, then determine how many leukocytes roll past that point during the selected time. Intravital microscopy supports measurements in vascular settings, whereas flow-based assays provide another way to examine leukocyte-endothelial interactions under blood-flow conditions. The resulting count is interpreted as a quantitative recruitment-related measurement.
Rolling flux is useful when an experiment asks whether inflammation or infection changes the initial interaction between circulating leukocytes and the endothelium. It can also evaluate how a therapeutic intervention alters that interaction. By quantifying an early recruitment step, the assay helps investigators relate vascular adhesion mechanisms to leukocyte movement and tissue inflammation.
Leukocyte trafficking depends on interactions at the vascular wall before cells move into inflamed tissue. Rolling flux supplies a quantitative measure of that early endothelial encounter, allowing researchers to compare conditions that alter recruitment. In the context of infection or inflammation, the result links selectin-dependent vascular behavior with broader changes in immune-cell delivery to affected tissues.