active transport

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active transport

[′ak·tiv ′tranz‚pȯrt]
(physiology)
The pumping of ions or other substances across a cell membrane against an osmotic gradient, that is, from a lower to a higher concentration.
References in periodicals archive ?
Because of the structure and size of MCs, active uptake into cells occurs via organic anion-transporting polypeptides (OATP/Oatp), as confirmed for liver-specific human OATP1B1 and OATP1B3, mouse Oatp1b2 (mOatp 1b2), skate Oatp 1d1, and the more widely distributed OATP1A2 expressed, for example, at the blood--brain barrier.
Recent studies with 131I-TM601 have been positive so far, demonstrating the very specific binding of the peptide to tumor cell receptors and its active uptake into cancer cells.
4) and milk (pH = 8), whereas other ionic compounds are transported into the milk via active uptake mechanisms (22,23).