It takes place when atoms, ions, or molecules fill the interstices (voids) found between the atoms, ions, or ionic groups of a crystal structure.
Crystal structures of the GluN1 and GluN3A ligand-binding domains (LBDs) in their apo states unexpectedly reveal open- and closed-cleft conformations, respectively, with water molecules filling the binding pockets.
In very small pores where adsorbate molecules fill the pore the permeability decreases with an increase in pressure, while in intermediate pores the permeability of such transport increases with pressure due to the increasing build-up of layers of adsorbed molecules.
Smaller free volume holes, connected with empty spaces between molecules filling the pores, are noticed in the case of saline solution.
This may be because there is no more space for CO2 molecule to be occupied due to the fact that the adsorbed CO2 molecules have been packed closely in the ultramicropores as previously described (according to the D-A theory, the CO2 molecules fill the micropores in a liquid-like state).
As Scholes et al. [37] and Li et al. [38] demonstrated, water is the more soluble species (0.4 cmHgSTP/cm3 cmHg at 35 °C) and its molecules fill the sorption sites available, present between the polymeric chains, used by CO2 or CH4 for passing through the membrane.
In the lyotropic phases, solvent molecules fill the space around the compounds to provide fluidity to the system.
These results show that neither size nor polyhedral shape of the α-carboxysome shell depends on RubisCO molecules filling the interior microcompartment space.
