medium

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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.

me·di·um

, pl.

me·di·a

(mē'dē-yŭm, -ă),
1. A means; that through or by which an action is performed.
2. A substance through which impulses or impressions are transmitted.
3. Synonym(s): culture medium
4. The liquid holding a substance in solution or suspension.
5. Any of the substances in which a chromatographic or electrophoretic separation is effected.
[L. neuter of medius, middle]

medium

(mē′dē-əm)
n. pl. me·dia (-dē-ə) or me·diums
1. Something, such as an intermediate course of action, that occupies a position or represents a condition midway between extremes.
2. An intervening substance through which something else is transmitted or carried on.
3. pl. media
a. A surrounding environment in which something functions and thrives.
b. The substance in which a specific organism lives and thrives.
c. A culture medium.

medium

Imaging
A substance used to enhance imaging of a particular structure.
 
Informatics
A material on which data is stored.

Microbiology
A liquid or solid matrix with nutrient designed to support the growth of microorganisms.

Medium types (microbiology)
Differential medium
Often solid and contains various chemical and other substances, e.g., colourants that may be produced by certain microorganisms, aiding in their identification.

Enrichment medium
Often liquid and contains specific nutrients to give one or more of the microorganisms a growth advantage.
 
Selective medium
Those in which nutrients are added to either promote the growth of one or more group of bacteria, or inhibitors (e.g., nalidixic acid, malachite green and others) to slow the growth of certain bacteria, giving the desired organisms a “selective” growth advantage.
 
Molecular biology
A gel on which a reaction can occur.
 
Paranormal
Channeler, see there.

medium

Imaging A substance used to enhance imaging of a particular structure. See Contrast medium, High-osmolality contrast medium, Low-osmolality contrast medium, Informatics A material on which data is stored. See Magnetic medium, Multimedia, Output medium.

me·di·um

, pl. media (mē'dē-ŭm, -ă)
1. A means; that through which an action is performed.
2. A substance through which impulses or impressions are transmitted.
3. Synonym(s): culture medium.
4. The liquid holding a substance in solution or suspension.

medium

Any substance in which micro-organisms may be cultured in an incubator. Most culture media use AGAR jelly or gelatine containing additional materials such as blood or meat broth to encourage bacterial growth. Selective media contain substances that discourage the growth of unwanted organisms or specifically foster the growth of others.

medium

(pl. media) a substance on which microorganisms, other small organisms, cells and tissues can be cultured. A medium can be liquid or solid. If solid, it frequently contains AGAR, a stiffening agent extracted from seaweed. Culture media can contain all necessary nutrients and trace elements for normal growth (a minimal medium) but can also be supplemented. For example, ANTIBIOTICS can be added to test for antibiotic resistance in bacteria.

me·di·um

, pl. media (mē'dē-ŭm, -ă)
1. A means; that through or by which an action is performed.
2. Liquid holding another substance in solution or suspension.
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