Medical dictionary. 2011.
Primary active transport — directly uses energy to transport molecules across a membrane. [GeorgiaPhysiology|7/7ch05/7ch05p11] Most of the enzymes that perform this type of transport are transmembrane ATPases. A primary ATPase universal to all cellular life is the sodium… … Wikipedia
Active transport — This article is about transport in cellular biology. For human transport systems, see active transportation. The action of the sodium potassium pump is an example of primary active transport. Active transport is the movement of a substance… … Wikipedia
active transport — Often defined as transport up an electrochemical gradient. More precisely defined as unidirectional or vectorial transport produced within a membrane bound protein complex by coupling an energy yielding process to a tranport process. In primary… … Dictionary of molecular biology
secondary active transport — active transport in which the movement of a second substance is coupled to the movement of a substance undergoing primary active transport, as in cotransport and countertransport … Medical dictionary
active transport — n movement of a chemical substance by the expenditure of energy against a gradient in concentration or electrical potential across a plasma membrane * * * (in biochemistry) an energy dependent process in which certain substances (including ions,… … Medical dictionary
Secondary active transport — In secondary active transport, in contrast to primary active transport, there is no direct coupling of ATP; instead, the electrochemical potential difference created by pumping ions out of the cell is used. [GeorgiaPhysiology|7/7ch05/7ch05p12]… … Wikipedia
transport — transportable, adj. transportability, n. transportive, adj. v. /trans pawrt , pohrt /; n. /trans pawrt, pohrt/, v.t. 1. to carry, move, or convey from one place to another. 2. to carry away by strong emotion; enrapture. 3. to send into banishment … Universalium
Primary School Leaving Examination — The Primary School Leaving Examination (PSLE) is a national examination taken by all students in Singapore near the end of their sixth year in primary school, which is also their last year in primary school before they leave for secondary school … Wikipedia
Membrane transport — In cellular biology the term membrane transport refers to the collection of mechanisms that regulate the passage of solutes such as ions and small molecules through biological membranes namely lipid bilayers that contain proteins embedded in them … Wikipedia
Passive transport — means moving biochemicals and other atomic or molecular substances across membranes. Unlike active transport, this process does not involve chemical energy, because, unlike in an active transport, the transport across membrane is always coupled… … Wikipedia
