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Specimen |
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specimen
1. Med a sample of tissue, blood, urine, etc., taken for diagnostic examination or evaluation 2. the whole or a part of an organism, plant, rock, etc., collected and preserved as an example of its class, species, etc. specimen [′spes·ə·mən] (science and technology) An item representative of others in the same class or group. A sample selected for testing, examination, or display. Specimen a sample, usually metal, that may be studied macro-scopically (in macrosections) or microscopically (in microsections). Preparation of a specimen entails grinding the flat surface of a sample and, if microsections are to be examined, polishing the surface. The surface is then etched with chemical reagents or heated in a gaseous atmosphere or in a vacuum. Selective etching and evaporation occur as a result of the differences in the physi-cochemical properties both of the grains of different phases as well as of the different grain-boundary regions. This leads to the formation of a macrorelief, which is visible to the unaided eye, or a microrelief, which must be examined with a microscope. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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