The three-dimensional conformation of biomolecules is of the utmost importance in their interactions; for example, in the binding of a substrate (reactant) to the catalytic site of an enzyme (Fig. 3-8), the two molecules must fit each other closely, in a complementary fashion, for biological function.
DD&A stands for Depletion, Depreciation and Amortization. Suggest new definition. This definition appears frequently and is found in the following Acronym Finder categories: Business, finance, etc.
Double Data Rate (DDR) Definition - What does Double Data Rate (DDR) mean? Double data rate (DDR) is the advanced version of synchronous dynamic random access memory (SDRAM). SDRAM waits for clock signals before responding to control inputs. DDR uses both the falling and rising edges of the clock signal. The difference between SDRAM and DDR is not the speed, but rather how many times data is transmitted with each cycle.