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Related Concept Videos

Rolling Without Slipping01:09

Rolling Without Slipping

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...
Rolling With Slipping01:14

Rolling With Slipping

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...
Rolling Resistance01:21

Rolling Resistance

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...
Rolling Resistance: Problem Solving01:17

Rolling Resistance: Problem Solving

Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
Equation of Motion: General Plane motion - Problem Solving01:16

Equation of Motion: General Plane motion - Problem Solving

Consider a lawn roller with a mass of 100 kg, a radius of 0.2 meters, and a radius of gyration of 0.15 meters. A force of 200 N is applied to this roller, angled at 60 degrees from the horizontal plane. What will be the angular acceleration of the lawn roller?
The friction between the roller and the ground is characterized by two coefficients. The static friction coefficient is 0.15, while the kinetic friction coefficient is 0.1. These values are crucial in understanding the interaction between...
Steps in the Modeling Process01:14

Steps in the Modeling Process

Albert Bandura's theory of observational learning identifies four critical processes: attention, retention, motor reproduction, and reinforcement or motivation.
Attention is the first necessary component for observational learning. It involves focusing on what the model is doing and saying. For example, if you decide to take a drawing class to enhance your skills, you need to pay close attention to the instructor's words and hand movements. The characteristics of the model significantly...

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A Modified Lean and Release Technique to Emphasize Response Inhibition and Action Selection in Reactive Balance
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Learning to roll before you stop and drop.

Joyce Marie Koenig1, Mervin C Yoder

  • 1Saint Louis University, MO, USA.

Blood
|May 25, 2013
PubMed
Summary
This summary is machine-generated.

Fetal blood neutrophils develop the ability to recruit to inflammation sites late in development. Before embryonic day 15, these cells show limited rolling and adhesion to inflamed endothelial cells, impacting leukocyte recruitment.

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Area of Science:

  • Hematology
  • Developmental Biology
  • Immunology

Background:

  • Leukocyte recruitment is crucial for immune response.
  • Ontogenic processes of fetal blood cells are not fully understood.
  • Inflammation-induced leukocyte recruitment requires mature endothelial cells and blood cells.

Purpose of the Study:

  • To characterize the ontogenic maturation of blood cells and yolk sac endothelial cells.
  • To understand the development of inflammation-induced leukocyte recruitment in fetal mice.
  • To investigate the functional capabilities of fetal blood neutrophils in response to inflammation.

Main Methods:

  • Utilized a unique intravital microscopic system in murine models.
  • Observed neutrophil rolling, adhesion, and extravasation in inflamed yolk sac vessels.
  • Performed in vitro assays using fetal blood cells and immobilized adhesion molecules.

Main Results:

  • Neutrophil recruitment was observed late in fetal development.
  • Before embryonic day 15, fetal neutrophils exhibited poor rolling and adhesion.
  • In vitro tests confirmed limited interaction of fetal neutrophils with adhesion molecules.

Conclusions:

  • Full adult-type inflammation-induced leukocyte recruitment requires late-stage maturation of fetal blood cells and vasculature.
  • Fetal blood neutrophils gain functional capacity for adhesion and extravasation progressively during development.
  • The study provides insights into the developmental timing of immune cell function.