Bacteria and yeast need to prevent leakage of numerous small molecules through their cell membrane. Biochemists have studied how the composition of the membrane affects passive diffusion and the ...

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

For molecules undergoing diffusion within a limited area , the size of the domain in which diffusion is confined can be estimated by fitting the MSD–nτ plot with the following equation 5,23: ...

Cell membranes protect and organize cells. All cells have an outer plasma membrane that regulates not only what enters the cell, but also how much of any given substance comes in. Unlike ...

Guest molecules slice through droplets of DNA polymers in a frontal wave, providing a foundation for better understanding ...

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

The team's membrane is able to filter out nanometer-sized molecules from aqueous solutions up to 10 times faster than state-of-the-art membranes, with the graphene itself being up to 100 times faster.

Researchers have identified a form of molecular motion that has not previously been observed. When what are known as "guest molecules"—molecules that are accommodated within a host molecule—penetrate ...

The new membrane can withstand temperatures up to 284 F (140 C) and pressures up to 30 atmospheres when exposed to organic solvents. These attributes are key because they allow the membrane to ...