Diffusion is the movement of particles from a region where they are in high concentration to a region where they are in low concentration, and is one of the ways substances can move across the cell ...

a) A classical morphogen (pink) elicits differential gene expression (represented by the black, red and blue bars) by activating different genes at different concentrations. b) One example of such a ...

Cell migration is stimulated and directed by the interaction of cells with extracellular matrix, neighboring cells or chemoattractants and is key to processes such as development and metastasis.

Active transport is a process that is required to move molecules against a concentration gradient. The process requires energy. For plants to take up mineral ions, ions are moved into root hairs, ...

This is a preview. Log in through your library . Abstract Polymorphonuclear leukocyte (PMN) chemotaxis has been examined under conditions which allow phase microscope observations of cells responding ...

The ability to move in a directed way instead of swimming willy-nilly in a random direction is vital for many microorganisms. “Evolution has taken enormous efforts to endow motile bacteria with the ...