| high osmolar contrast medium | Ionic water-soluble iodinated contrast media. Synonym: high osmolar contrast medium. (05 Mar 2000) |
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| selective medium | <cell culture> A medium which allows the growth of certain types of microorganisms in preference to others. For example: an antibiotic-containing medium allows the growth of only those microorganisms which are resistant to this antibiotic. (09 Oct 1997) |
| separating medium | Any coating which serves to prevent one surface from adhering to another, in dentistry, a material usually applied to a cast to facilitate separation from the resin denture base after curing; a coating on impressions to facilitate removal of the cast. (05 Mar 2000) |
| Simmons' citrate medium | A diagnostic medium used in the differentiation of species of Enterobacteriaceae, based on their ability to utilise sodium citrate as the sole source of carbon. (05 Mar 2000) |
| hypoxanthine-aminopterin-thymine medium | A type of agar growth medium (a selective medium) which is used to select for cells that are able to make their nucleic acids out of hypoxanthine and/or thymine. All cells are prevented from making nucleotides by any other means (due to the presence of aminopterin or other drugs in the medium), so cells which are unable to use hypoxanthine and/or thymine to do this will not grow, multiply, and become visible colonies. This leaves the cells which are being selected for. (09 Oct 1997) |
| stratum griseum medium | See: gray layer of superior colliculus. (05 Mar 2000) |
| nutrient medium | A substance, either solid or liquid, used for the cultivation, isolation, identification, or storage of microorganisms. Synonym: growth medium, medium, nutrient medium. (05 Mar 2000) |
| support medium | The material in which separation takes place, as in separation of components in electrophoresis. (05 Mar 2000) |
| defined medium | <cell culture> Cell culture medium in which all components are known. In practice this means that the serum (that is normally added to culture medium for animal cells) is replaced by insulin, transferrin and possibly specific growth factors such as platelet-derived growth factor. (18 Nov 1997) |
| differential medium | A medium which is used to differentiate different types of microorganisms based on their different colours or colony shapes. Examples of differential media are: Macconkey's agar and SS agar. (09 Oct 1997) |
| dispersion medium | The medium or fluid in which a disperse is suspended. Synonym: continuous phase, dispersion medium, dispersion phase, external medium. (05 Mar 2000) |
| immersion medium | <microscopy> In microscopy the medium used to immerse the specimen, the space between the objective lens and coverslip, or the condenser lens front element and the slide. For the latter purposes, cedar or synthetic oils with refractive indices and dispersions approximating the front elements of the lens are used for homogeneous immersion. Homogeneous immersion provides high numerical aperture, less light loss and depolarisation, and generally improved correction of aberrations. Glycerol or water may be used for immersion of particular lenses, but for high-numerical aperture lenses designed to be used with a variety of immersion media, proper adjustment of the correction collars is necessary, the refractive index, thickness, and dispersion of the immersion media and coverslips all enter into the corrections for aberrations of high-numerical aperture objective and condenser lenses. (05 Aug 1998) |
| Thayer-Martin medium | A Mueller-Hinton agar with 5% chocolate sheep blood and antibiotics, used for transport and primary isolation of Neisseria gonorrhoeae and Neisseria meningitides. Synonym: Thayer-Martin medium. (05 Mar 2000) |
| Eagle's basal medium | A solution of various salts containing 13 naturally occurring amino acids, several vitamins, two antibiotics, and phenol red; used as a tissue culture medium. (05 Mar 2000) |
| Eagle's minimum essential medium | A tissue culture medium similar to Eagle's basal medium but with different amounts and a few exclusions (e.g., antibiotics and phenol red). (05 Mar 2000) |