# substratum

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## sub·stra·tum

(sŭb-strā'tŭm),
Any layer or stratum lying beneath another.
[L. see substrate]
Farlex Partner Medical Dictionary © Farlex 2012

## substratum

(sŭb′strā′təm, -străt′əm)
n. pl. sub·strata (-strā′tə, -străt′ə) or sub·stratums
Biology A substrate.

## substrate

, substratum (sub'strat) (sub-stra'tum) [L. substratum, to lie under]
1. An underlying layer or foundation.
2. A base, as of a pigment.
3. The substance acted upon, as by an enzyme. See: enzyme
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
where v is the velocity field of the [OMEGA](1) substratum. The definition of the velocity field v is
According to Assumption 3, the [OMEGA](1) substratum is homogeneous, that is [partial derivative][rho]/ [partial derivative]x =[partial derivative]p/[partial derivative]y = [partial derivative]p/[partial derivative]z = [partial derivative]p/[partial derivative]t = 0.
(50), the masses bearing positive electric charges are changing since the strength of a sink evaluates the volume of the [OMEGA](1) substratum entering the sink per unit of time.
(39) of the [OMEGA](1) substratum should be changed as
We suppose that the [OMEGA](1) substratum is almost incompressible, or we suppose that [theta] is a sufficient small quantity and varies very slow in the space so that it can be treaten as [theta] = 0.
It is natural to say that there are no other body forces or surface forces exerted on the [OMEGA](1) substratum. Thus, we have f = 0.
(82) are the electromagnetic wave equations with sources in the [OMEGA](1) substratum. In the source free region where [[rho].sub.e] = 0 and j = 0, the equations reduce to the following equations
(84) are the electromagnetic wave equations without the sources in the [OMEGA](1) substratum.
(85), we see that the velocity [C.sub.0] of electromagnetic waves in the vacuum is the same as the velocity [c.sub.t] of the transverse elastic waves in the [[OMEGA].sub.2](1) substratum.

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