our design uses hollow colloids serving as spherical cell-membrane mimics, with a well-defined single micropore,” they explained. In order to perform the tasks required for active transport, the ...

A general concept in biology is that cells use two ... across their membrane: selective pores, which allow passive transport driven by a concentration gradient, and active transport complexes ...

eg urea No Osmosis Water moves from a high to a low concentration across a partially permeable membrane and down a concentration gradient Water No Active transport Substances move against a ...

Since the cell membrane is impenetrable for potassium ... while the pump enables an active transport that can enrich potassium in the cell by 10,000-fold." The data, recently published in Nature ...

The two transport worlds, passive and active ... energy carrier of the cells, to “fuel” the conformational change, which opens up a tunnel to the interior of the membrane.

Transport across membranes All cells are enclosed by a cell membrane, which is selectively permeable. Molecules can move into or out of cells by diffusion and active transport. Cells can gain or ...

It provides a completely new way for remote, non-invasive, and active control of the transport behaviors in synthetic membrane materials. "Using light to control the mass and charge transportation in ...