Many enzymes consist of a protein and a non-protein (called the cofactor). The proteins in enzymes are usually globular. The intra- and intermolecular bonds that hold proteins in their secondary and tertiary structures are disrupted by changes in temperature and pH. This affects shapes and so the catalytic activity of an enzyme is pH and temperature sensitive.
Everyday in the U.S. millions of cars and trucks idle needlessly, sometimes for hours. You may not be able to avoid keeping your engine running when youâre stopped at a traffic signal or stuck in slow-moving traffic. But other times idling is unnecessary. An idling car can release as much pollution as a moving car.
[Help] Rough idle at stop lights and rough ride at low velocites (1st gear) I have a 2002 Volvo S40 with 98k miles on it. Recently I have been experiencing rough idle once in a while while stopped at a red light and rough ride at low velocities, plus sometimes slugish acceleration. The car will stable idle for 10 seconds or so and then every 10 seconds it will just hickup (low rev and back to normal), it happens every 10 or so seconds. Then while I press on the accelerator the car runs fine but sometimes it will hickup while accelerating (like skip a beat).