| SM | Master of Science; sadomasochism; self-monitoring; silicon microphysiometer; simple mastectomy; skim... |
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| STEM | scanning transmission electron microscope; Society of Teachers of Emergency Medicine |
| STM | scanning tunneling microscope; short-term memory; streptomycin |
| TEM | transmission electron microscope/ microscopy; triethylenemelamine |
| UEM | universal electron microscope |
| microscope, Greenough | <microscopy> A stereoscopic microscope with paired objectives, prisms, and eyepieces invented by H. Greenough. The name is sometimes incorrectly used for any stereoscopic microscope with paired objectives showing erect images. (05 Aug 1998) |
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| microscope mirror | <microscopy> Usually plane on one side and concave on the other. The flat side is generally used unless the objective is of very low power and there is no condenser. The mirror should be so mounted that the concave side can be focused on the specimen. (05 Aug 1998) |
| microscope, simple | <microscopy> A microscope that has a single converging lens (or a combination of lenses that function optically as a single converging lens). Anton van leeuwenhoek (1632-1723) made good use of the simple microscope to look at the life within a drop of water, and such. The magnifying properties of lenses had been well known in ancient times (for example to the greeks and romans) but it was not until about 1600 that it became possible to make small lenses with the precision needed to make a microscope. (12 Dec 1998) |
| microscope, stereoscopic | <microscopy> Either one of two kinds: binocular-bi-nobjective, such as the Greenough microscope type, and binocular microscope with common main objective. See: stereomicroscope. (05 Aug 1998) |
| monobjective binocular microscope | <instrument, microscopy> A microscope with one objective and two bodies, for binocular vision, not necessarily stereoscopic. (05 Aug 1998) |
| monocular microscope | <instrument, microscopy> A microscope with one objective and one bodytube for monocular vision. (05 Aug 1998) |
| colour-contrast microscope | <instrument> A type of microscope in which the condenser stop is of one colour and the annulus is a complement of it so that unstained objects are observed in one colour on a field of the other. (05 Mar 2000) |
| comparator microscope | <instrument> A device constructed with one or more microscope's having micrometer eyepieces used to measure dimensional changes during setting or temperature changes. (05 Mar 2000) |
| compound microscope | <instrument> A microscope (an optical instrument that augments the power of the eye to see small objects) which consists of two microscopes in series, the first serving as the ocular lens (close to the eye) and the second serving as the objective lens (close to the object to be viewed). Credit for creating the compound microscope goes usually to the Dutch spectaclemakers Hans and Zacharias Janssen who in 1590 invented an instrument that could be used as either a microscope or telescope. The compound microscope has evolved into the dominant type of optical microscope today. (12 Dec 1998) |
| confocal microscope | <instrument> A microscope that allows the observer to visualise objects in a single plane of focus, thereby creating a sharper image (usually the objects are fluorescent molecules); a refinement of this microscope uses optical sectioning and a computer to record serial sections. This permits three-dimensional reconstruction. (05 Mar 2000) |
| polarising microscope | <instrument> A microscope equipped with a polarising filter below and above the specimen which forms an image by the influence of specimen birefringence on polarised light; the polarising direction of the two filters is typically adjustable which, together with a graduated rotating stage, permits measurement of the angular value of different refractive indices in either biological or chemical specimens. (05 Mar 2000) |
| polarized light microscope | <instrument, microscopy> A microscopical polarizcope, i.e., a compound microscope which is equipped with two polars and a Bertrand lens, chemists and mineralogists are the principal users. (05 Aug 1998) |
| crystallography, X-ray | The study of crystal structure using X-ray diffraction techniques. (12 Dec 1998) |
| half-ray | <geometry> A straight line considered as drawn from a center to an indefinite distance in one direction, the complete ray being the whole line drawn to an indefinite distance in both directions. Source: Websters Dictionary (01 Mar 1998) |
| Harris and Ray test | A test for vitamin C in the urine; a microtitration test of the urine against a known amount of 0.05% aqueous solution of the dye 2,6-dichloroindophenol in 10% acetic acid (usually 0.05 ml of dye is used, roughly equivalent to 0.025 mg of ascorbic acid). Synonym: Harris test. (05 Mar 2000) |