medium

[me´de-um] (pl. mediums, me´dia) (L.)

1. an agent by which something is accomplished or an impulse is transmitted.

3. a preparation used in treating histologic specimens.

contrast medium a radiopaque substance used in radiography to permit visualization of body structures. Called also contrast agent.

culture medium a substance or preparation used to support the growth of microorganisms or other cells; called also medium.

dioptric media refracting media.

disperse medium dispersive m.

dispersion medium dispersive m.

dispersive medium the continuous phase of a colloid system; the medium in which the particles of the disperse phase are distributed, corresponding to the solvent in a true solution.

refracting media the transparent tissues and fluid in the eye through which light rays pass and by which they are refracted and brought to a focus on the retina.

ex·ter·nal phase

the medium or fluid in which a disperse is suspended.

Synonym(s): continuous phase, dispersion medium, dispersion phase, external medium

Farlex Partner Medical Dictionary © Farlex 2012

ex·ter·nal phase

(eks-tĕr'năl fāz)

The medium or fluid in which a disperse is suspended.
Synonym(s): dispersion medium.

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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References in periodicals archive

The analysis according to group contribution theory suggests that the solubility parameters of the clay surfactant should be close in value to the ones of the solvents used as the initial dispersion medium.

The solvent used as the initial dispersion medium for the clay should be miscible with water.

Gas transport properties in waterborne polymer nanocomposite coatings containing organomodified clays

After the ultimate separation, a part of the dispersion medium is located among the particles from the dispersion phase of the sediment and the emergent.

On the other hand, V = V'+V", where V' is the volume of the dispersion phase in this sediment (emergent) and V" is the volume of the bound dispersion medium of the sediment (emergent).

Model of close packing for determination of the major characteristics of the liquid dispersions components

The 2D SAXS patterns of the latex dispersion were taken at different contrasts with the sucrose content in the dispersion medium ranging between 0 and 60 wt%.

Only the mass density of the dispersion medium [rho.sub.m] is allowed to vary.

Radial structure of commercial styrene-co-butyl acrylate latex particles by means of synchrotron small-angle X-ray scattering under contrast-variation conditions

quartz) may be ground in the presence of the dispersion medium. Passing a heavy electric current through a cell may lead to the sputtering (crumbling) of an electrode into colloidal particles.

This may be prevented by avoiding the presence of electrolytes in the dispersion medium or by keeping their concentration at a minimum.

Colloidal dispersions: an overview: the cosmetic scientist must consider various repellent and attractive forces involved in these systems

where [[eta].sub.0] is the viscosity of the pure dispersion medium and [eta] is the intrinsic viscosity (2.5 for hard spheres).

The reason for the higher maximum [[phi].sub.w] in the latter is that the stabilizing layer for the polymerically stabilized latex does not extend as far into the dispersion medium, enabling more particles to be packed into the same volume of water while maintaining a relatively low viscosity.

Rheological Behavior of a Polymerically Stabilized Latex for Use in Water-Borne Coatings

After completion of the polymerization period, the reactor content was cooled down to room temperature and centrifuged at 5000 rpm for 5 minutes for the removal of dispersion medium. The PCMS beads were redispersed within 10 mL of ethanol and centrifuged again under similar conditions.

The polarity of dispersion medium was adjusted by mixing methoxyethanol and ethanol at different ratios.

Monodisperse Poly(p-chloromethylstyrene) Microbeads by Dispersion Polymerization