Enables the directed movement of substances (such as macromolecules, small molecules, ions) into, out of, within or between cells [goid 5215] [evidence IEA]; Catalysis of the transfer of amines, including polyamines, from one side of the membrane to the other. Amines are organic compounds that are weakly basic in character and contain an amino (-NH2) or substituted amino group [goid 5275] [pmid 9733774] [evidence TAS]; Catalysis of the transfer of purines, one of the two classes of nitrogen-containing ring compounds found in DNA and RNA, from one side of a membrane to the other [goid 5345] [evidence ISS]; Catalysis of the transfer of purines, one of the two classes of nitrogen-containing ring compounds found in DNA and RNA, from one side of a membrane to the other [goid 5345] [pmid 9733774] [evidence IDA]; Catalysis of the transfer of pyrimidines, one of the two classes of nitrogen-containing ring compounds found in DNA and RNA, from one side of a membrane to the other [goid 5350] [evidence ISS]; Catalysis of the transfer of pyrimidines, one of the two classes of nitrogen-containing ring compounds found in DNA and RNA, from one side of a membrane to the other [goid 5350] [pmid 9733774] [evidence IDA]; Catalysis of the transfer of a polyol from one side of the membrane to the other. A polyol is any polyhydric alcohol [goid 15166] [pmid 9733774] [evidence TAS]; Transport systems of this type catalyze facilitated diffusion of water (by an energy-independent process) by passage through a transmembrane aqueous pore or channel without evidence for a carrier-mediated mechanism [goid 15250] [evidence ISS]; Transport systems of this type catalyze facilitated diffusion of water (by an energy-independent process) by passage through a transmembrane aqueous pore or channel without evidence for a carrier-mediated mechanism [goid 15250] [pmid 9733774] [evidence IDA]; Catalysis of the transfer of substances, sized less than 1000 Da, from one side of the membrane to the other. The transmembrane portions of porins consist exclusively of beta-strands which form a beta-barrel. They are found in the outer membranes of Gram-negative bacteria, mitochondria, plastids and possibly acid-fast Gram-positive bacteria [goid 15288] [pmid 9733774] [evidence NAS]; Catalysis of the transfer of carboxylic acids from one side of the membrane to the other. Carboxylic acids are organic acids containing one or more carboxyl (COOH) groups or anions (COO-) [goid 46943] [pmid 9733774] [evidence TAS]