Device for transferring thermal energy.

Device for exchanging ions selectively.

Material that swaps positive ions.

Resin that exchanges negative ions.

Server routing emails to recipients.

Heat or substance transfer mechanism.

The sodium-calcium exchanger (often denoted Na+/Ca2+ exchanger, exchange protein, or NCX) is an antiporter membrane protein that removes calcium from cells.

A regenerative heat exchanger, or more commonly a regenerator, is a type of heat exchanger where heat from the hot fluid is intermittently stored in a thermal storage medium before it is transferred to the cold fluid.