As substrate is used up, the enzyme's active sites are no longer saturated, substrate concentration becomes rate limiting, and the reaction becomes first order between B and C. To measure enzyme activity ideally, the measurements must be made in that portion of the curve where the reaction is zero order.
About CCRT. Canadian Chihuahua Rescue and Transport (CCRT) is a network of volunteers working together to rescue, transport, foster and provide necessary veterinary care for homeless, abandoned, neglected, or abused Chihuahuas. The idea was created by a Canadian who realized the need in 1996.
A CCR can also be exported to other formats, such as PDF or Office Open XML (Microsoft Word 2007 format). The Continuity of Care Document (CCD) is an HL7 CDA implementation of the Continuity of Care Record (CCR).