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.
Current: Diverging Diamond Interchange Diverging Diamond Interchange. A Diverging Diamond Interchange (DDI) is a type of interchange in which the two directions of traffic on a non-highway road cross to the opposite side on both sides of a bridge. It is unusual in that it requires traffic on the highway overpass to briefly drive on the opposite side of the road from what is customary.