This takes place when molecules diffuse across the cell membrane by travelling through specific transport proteins. It occurs down a concentration gradient - molecules move from an area of high to ...

Learn how molecules move through membranes by passive diffusion, active transport and osmosis. BBC Bitesize Scotland SQA National 5 Biology revision.

Active transport involves molecules moving against a gradient or other form of resistance, such as from an area of lower to higher charge. Active transport is used by cells to accumulate needed ...

It was known that in presence of a gradient across the filter, molecules will move from a region where there is a higher concentration of molecules to a region of lower concentration.

By applying a voltage across the device, the researchers stopped and started the flow and controlled the concentration of ions and molecules moving through the device’s 35-nanometer-high, one ...

Morphogens are signaling molecules that are released from particular areas of tissues, creating a concentration gradient that decreases in concentration further away from the source. This has ...

The bicoid gradient thus was the first demonstrated example of embryonic patterning via a morphogen, a factor whose concentration dictates gene expression in a dose-dependent manner.

Molecules exhibit non-reciprocal interactions without external forces, new study finds Peer-Reviewed Publication. University of Maine ...

These molecules repel water at one end and attract it at the other, properties that cause them to self-assemble into spherical structures, which can encapsulate large payloads of biological molecules.