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.
What is 'Depreciation, Depletion and Amortization â DD&A' Depreciation, depletion and amortization (DD&A) are noncash expenses used in accrual accounting. Depreciation is a means of allocating the cost of a material asset over its useful life, and depletion is used to allocate the cost of extracting natural resources from the Earth and is the actual physical depletion of a natural resource by a company.