Crawling on directional surfaces

Directional Wetting on Patterned Surfaces

Control and Omni-directional Locomotion of a Crawling Quadruped

robot to mass (with friction) Force in, velocity out causality Ewoud Vos 6 Mass Impedance Legged robot controller Fig. 1: Abstraction of a legged robot to an omni-directional moving mass that can then, for instance, be controlled by an impedance controller. Fig. 1. This scheme requires a gait controller that ensures that the legs move to support the motion of the robot. The gait generator as pr...

A chemotactic gradient sequestered on endothelial heparan sulfate induces directional intraluminal crawling of neutrophils.

During infection, chemokines sequestered on endothelium induce recruitment of circulating leukocytes into the tissue where they chemotax along chemokine gradients toward the afflicted site. The aim of this in vivo study was to determine whether a chemokine gradient was formed intravascularly and influenced intraluminal neutrophil crawling and transmigration. A chemokine gradient was induced by ...

Characterization of Shortest Paths on Directional Frictional Polyhedral Surfaces

In this paper, we address a shortest path problem where an autonomous vehicle moves on a polyhedral surface according to a distance function that depends on the direction of the movement (directional) and on the friction of the space (frictional). This shortest path problem generalizes a hierarchy of problems and finds geometric structure to solve several proximity problems. We perform the char...

On the crawling of cells.

Motile cells moving in vitro do so via a characteristic motile appendage, the lamellipod, a broad, flat region of the cell cytoplasm which extends ahead of the moving cell, and which is devoid of organelles. I describe here a mechanochemical model for how the lamellipod propels the cell forward. The propulsive force for the spreading of the lamella derives from the swelling pressure of the cyto...