active transport

in biology
https://doi.org/10.1351/goldbook.A00112
The carriage of a solute across a biological @MT06878@ from low to high concentration which requires the expenditure of (metabolic) energy.
Source:
PAC, 1992, 64, 143. (Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)) on page 145 [Terms] [Paper]