"To cross the membrane" refers to the process of moving from one side of a barrier in a cell or organism to the other side. It can apply to various substances such as molecules, ions, or even larger particles.
Full definition
Gold nanowires may
cross a membrane passively, but thanks to their rod - or wirelike asymmetric shape, active motion can be triggered by ultrasound.
They have genes for encoding proteins capable
of crossing membranes, even though archaea — which lack organelles — don't really have membranes to cross.
A number of bacterial toxins have evolved diverse strategies for
crossing membrane barriers in order to reach their substrates in the mammalian cytosol.
An occluded site stabilizes charged amino acids as
they cross the membrane field to achieve switchlike channel opening.
The bacterial strains confined in the chambers will form colonies — thanks in part, the team suspects, to growth factors from neighboring organisms that
cross the membranes.
Agre: The transport mechanism, the proteinaceous channel that allows water to
cross membranes.
The phosphate attached can determine factors such as whether a protein can
cross a membrane, whether one protein will associate with another, or whether a protein is active.
In 2017, electron microscopy (EM) gave them a first glimpse of how the crucial Hrd1 channel allows proteins to
cross the membrane.
Transporters are required for carbonate ions to
cross any membrane, but no carbonate transporters have ever been detected.