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The fluids and transparent tissues of the eye that refract light rays passing through them toward the retina: the cornea, aqueous humor, lens, and vitreous humor.
See also: medium
pl. media, mediums [L.]
1. an agent by which something is accomplished or an impulse is transmitted.
2. a substance providing the proper nutritional environment for the growth of microorganisms; called also culture medium.
basic nutritive medium
one adequate for the growth requirements of most bacteria.
a radiopaque (positive) substance, or (negative) gases used in radiography to permit visualization of body structures.
a substance used to support the growth of microorganisms or other cells.
refracting medium (see below).
disperse medium, dispersion medium
the continuous phase of a colloid system; the medium in which a colloid is dispersed, corresponding to the solvent in a true solution.
modification of a basic medium for the growth of fastidious bacteria. Common additions are blood, serum or egg yolk.
a type of bacteriological medium which may contain a fermentable sugar plus a pH indicator that gives a color change. It is used to identify bacteria on the basis of a characteristic biochemical reaction.
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.
a technique for examining meat for bacterial contamination. The solid medium is made up in the form of a sausage and slices are removed from it after application of the exposed end to the suspect meat.
formulated to facilitate the isolation of specific bacteria, they contain substances to inhibit growth of others.
formulated to preserve a specimen, usually tissue or microbiological swab, and minimize bacterial overgrowth for the time necessary to transport it to the laboratory.