We drive past the first barrels, rings and domes of the new rocket, arranged across the factory floor like some sort of modernistic Stonehenge.
This mechanism of membrane pore formation is so named because the transmembrane peptides, or peptide complexes, lining the channel are positioned in a barrel-like ring, with the peptides forming transmembrane staves.
The friction force between the barrel shaped piston ring and the cylinder liner was measured under flooded oil supply conditions.
He looked at her wedding ring, a barrel of dull yellow, and then at her watch.
With a molecular mass of 700 kDa, the CP is composed of seven distinct α and β subunits, each of which form heptameric rings stacked into a barrel composed of two outer α rings and two inner β rings (Groll et al., 1997).
With an essentially common architecture across eukaryotes, it comprises a CP (core particle; the 20S proteasome, barrel) of four stacked heptameric rings (two β rings, which encode the proteolytic activities, flanked on each side by an α ring [ 1, 2]) and one or two RPs (regulatory particles; 19S, cap) [ 3].
The acrylic core barrels used in this method (7 cm diameter × 34 cm length × 0.65 cm wall) are fitted with a polyvinyl chloride annulus at the top of the barrel, consisting of two O-rings on the outer surface of the annulus and one O-ring on the inner surface.
These proteins are characterized by two α-α domains in the same peptide chain; the first is an α6-α6 barrel of two concentric rings, whereas the second is a barrel with 10 α helices, one 310 helix and at least two β-strands inserted in between helical elements [ 44].
Or you can buy a PVC fitting from most home improvement stores that has one pipe sliding inside an outer barrel with an O-ring inside.
