The average size and density of the pores can be controlled during the manufacturing process.

When the heart relaxes, blood is drawn back toward the heart through open ended pores (ostia).

Recent studies have shown that those subjects who have an extremely high occurrence of PVCs (several thousand a day) can develop dilated cardiomyopathy.

Conceptacles open to the environment via one or many pores, depending on the species and the type of conceptacle.

The plastinated specimens retain their dilated conformation by a positive pressure air flow, which allows them to be used to teach both endoscopic technique and gastrointestinal anatomy.

In 1884, the French microbiologist Charles Chamberland invented a filter (known today as the Chamberland filter or Chamberland Pasteur filter) with pores smaller than bacteria.

They can move rapidly through the pores between soil particles, and are typically found from the surface down to a depth of about 50 cm.

Because of the size exclusion, the colloidal particles are unable to pass through the pores of an ultrafiltration membrane with a size smaller than their own dimension.

Gravity does not play a role, as it is obvious from the fact that wetting takes place independent of the orientation of the pores relative to the direction of gravity.

We find life at the bottom of every long term, long distance drilling core into the center of rock that we bring up and there's bacteria in the pores of that rock.

The resulting tubes can be removed by mechanical forces for tubes up to 10 µm in length, i.e., by just drawing them out from the pores or by selectively dissolving the template.

The exact process is still not understood theoretically in detail but its known from experiments that low molar mass systems tend to fill the pores completely, whereas polymers of sufficient chain length just cover the walls.

And even when you close the pore which neurons can do, they can open and close these pores to generate electrical activity even when it's closed, because these ions are so small, they can actually sneak through, a few can sneak through at a time.

This process happens typically within a minute for temperatures about 50 K above the melting temperature or glass transition temperature, even for highly viscous polymers, such as, for instance, polytetrafluoroethylene, and this holds even for pores with an aspect ratio as large as 10,000.