. . . "0.000000000000001"^^ . "Picokatal Per Liter"@en-us . . . . "pkat/L"^^ . "Picokatal Per Litre"@en . . "A unit of catalytic activity used especially in the chemistry of enzymes. A catalyst is a substance that starts or speeds a chemical reaction. Enzymes are proteins that act as catalysts within the bodies of living plants and animals. A catalyst has an activity of one katal if it enables a reaction to proceed at the rate of one mole per second. "^^ . . "pkat/L" .