| ping-pong | See: ping-pong mechanism. Origin: Ping-Pong, trademark for table tennis (05 Mar 2000) |
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| ping-pong bone | The thin shell of osseous tissue at the periphery of a giant cell tumour in a bone. (05 Mar 2000) |
| ping-pong mechanism | A special multisubstrate reaction in which, for a two-substrate, two-product (i.e., bi-bi) system, an enzyme reacts with one substrate to form a product and a modified enzyme, the latter then reacting with a second substrate to form a second, final product, and regenerating the original enzyme. An example of such a mechanism is found in the aminotransferases. More complex ping-pong mechanisms exist for enzymes having more than two substrates. Synonym: double displacement mechanism. (05 Mar 2000) |