| scheme | 1. A combination of things connected and adjusted by design; a system. "The appearance and outward scheme of things." (Locke) "Such a scheme of things as shall at once take in time and eternity." (Atterbury) "Arguments . . . Sufficient to support and demonstrate a whole scheme of moral philosophy." (J. Edwards) "The Revolution came and changed his whole scheme of life." (Macaulay) 2. A plan or theory something to be done; a design; a project; as, to form a scheme. "The stoical scheme of supplying our wants by lopping off our desires, is like cuttig off our feet when we want shoes." (Swift) 3. Any lineal or mathematical diagram; an outline. "To draw an exact scheme of Constantinople, or a map of France." (South) 4. <astronomy> A representation of the aspects of the celestial bodies for any moment o at a given event. "A blue case, from which was drawn a scheme of nativity." (Sir W. Scott) Synonym: Plan, project, contrivance, purpose, device, plot. Scheme, Plan. Scheme and plan are subordinate to design; they propose modes of carrying our designs into effect. Scheme is the least definite of the two, and lies more in speculation. A plan is drawn out into details with a view to being carried into effect. As schemes are speculative, they often prove visionary; hence the opprobrious use of the words schemer and scheming. Plans, being more practical, are more frequently carried into effect. "He forms the well-concerted scheme of mischief; 'T is fixed, 't is done, and both are doomed to death." (Rowe) "Artists and plans relieved my solemn hours; I founded palaces, and planted bowers." (prior) Origin: L. Schema a rhetorical figure, a shape, figure, manner, Gr, form, shape, outline, plan, fr, to have or hold, to hold out, sustain, check, stop; cf. Skr. Sah to be victorious, to endure, to hold out, AS. Sige victory, G. Sieg. Cf. Epoch, Hectic, School. Source: Websters Dictionary (01 Mar 1998) |
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| schemochromes | A colour created by an optical effect (e.g., via interference, refraction, or diffraction). Many naturally occurring blues fall in this class. Compare: natural pigment. Synonym: schemochromes. (05 Mar 2000) |
| Schenck | Benjamin R., U.S. Surgeon, 1873-1920. See: Schenck's disease. (05 Mar 2000) |
| Schenck's disease | <dermatology> A chronic fungal infection caused by Sporothrix schenckii. A granulomatous infection that usually involves the skin and superficial lymph nodes. (06 Mar 1998) |
| Scheuermann | Holger W., Danish surgeon, 1877-1960. See: Scheuermann's disease. (05 Mar 2000) |
| scheuermann disease | <radiology> Decreased disc space, especially anteriorly, irreg. Vertebral endplates, with or without Schmorl nodes (12 Dec 1998) |
| scheuermann's disease | Osteochondrosis of the vertebral epiphyses in children. (12 Dec 1998) |
| Schick | Bela, Austrian paediatrician in U.S., 1877-1967. See: Schick method, Schick test, Schick test toxin. (05 Mar 2000) |
| Schick method | A test for susceptibility to Corynebacterium diphtheriae toxin: 0.1 ml of Schick test toxin is injected into the skin of one forearm (test site) and the same quantity of the same, but heat-inactivated, material into the skin of the other forearm (control site); individuals with toxin-neutralizing antibodies either will have no reaction at either injection site (negative test) or may have a pseudoreaction due to antibodies for substances (antigens) in the test materials other than diphtheria toxin; individuals lacking toxin-neutralizing antibodies may have a positive reaction, which consists of an area of redness appearing 24 to 36 hours at the test site only and persisting for 4 to 5 days. Synonym: Schick method. (05 Mar 2000) |
| Schick test | A test for susceptibility to Corynebacterium diphtheriae toxin: 0.1 ml of Schick test toxin is injected into the skin of one forearm (test site) and the same quantity of the same, but heat-inactivated, material into the skin of the other forearm (control site); individuals with toxin-neutralizing antibodies either will have no reaction at either injection site (negative test) or may have a pseudoreaction due to antibodies for substances (antigens) in the test materials other than diphtheria toxin; individuals lacking toxin-neutralizing antibodies may have a positive reaction, which consists of an area of redness appearing 24 to 36 hours at the test site only and persisting for 4 to 5 days. Synonym: Schick method. (05 Mar 2000) |
| Schick test toxin | Corynebacterium diphtheriae toxin diluted so that the inoculated dose (0.1 or 0.2 ml) will contain 1/50 th of guinea pig minimal lethal dose. See: Schick test. Synonym: diagnostic diphtheria toxin. (05 Mar 2000) |
| Schiff base | The reaction of a primary amine with an aldehyde or ketone yields an imine sometimes called a Schiff base. When an arylamine is used the Schiff base may form an intermediate in a staining reaction, for example for polysaccharides. (18 Nov 1997) |
| schiff bases | Condensation products of aromatic amines and aldehydes forming azomethines substituted on the n atom, containing the general formula r-n:chr. (12 Dec 1998) |
| Schiff's reagent | An aqueous solution of basic fuchsin or pararosaniline which is decolorised by sulfur dioxide, commonly prepared by addition of hydrochloric acid to a dye solution containing a metabisulphite or bisulphite salt; used for aldehydes and in histochemistry to detect polysaccharides, DNA, and proteins. See: Feulgen stain, periodic acid-Schiff stain, ninhydrin-Schiff stain for proteins. (05 Mar 2000) |
| Schiff, Hugo | <person> German chemist in Florence, 1834-1915. See: Schiff base, Schiff's reagent, Kasten's fluorescent Schiff reagents, periodic acid-Schiff stain, ninhydrin-Schiff stain for proteins. (05 Mar 2000) |