However, they can be programmed with a variety of gradient index (GRIN ... enabling complex 3D GRIN structure not possible with traditional processes that rely on diffusion. We have created a number ...

This diffusion was also quantified by measuring ... There is thus ample evidence that regulatory gene expression gradients are present in certain regions, and that these gradients play a role ...

This is due to the random movement of the molecules. The direction of diffusion is said to be 'down' or 'with' the concentration gradient. Diffusion stops when the concentration of the substance ...

Diffusion Substances move from a high to a lower concentration down a concentration gradient Carbon dioxide, oxygen, water, food substances, wastes, eg urea No Osmosis Water moves from a high to a ...