Substrate

1. A compound that is altered by an enzyme. 2. Food source for growing cells or micro-organisms. 3. Material on which a sedentary organism lives and grows.

The physical material upon which a photovoltaic cell is applied.

The material forming the underlying layer of streams. Substrates may be bedrock, gravel, boulders, sand, or clay.

The base on which an organism lives or a substance acts upon (as by an enzyme).

The composition of a streambed, including either mineral or organic material. Materials that form an attachment medium for organisms.

Surface on which a plant or animal grows or is attached. The base on which an organism lives; a substance acted upon.

Backing film layer that supports the magnetic layer in a magnetic tape. PET is currently the most commonly used tape substrate.