dark-ground illumination

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• dark-ground illumination — noun (biology) A method for the microscopic examination of living material by scattered light, specimens appearing luminous against a dark background (cf ↑bright field illumination) • • • Main Entry: ↑dark …   Useful english dictionary

• dark ground illumination — noun a form of microscopic examination of living material by scattered light; specimens appear luminous against a dark background • Syn: ↑dark field illumination • Hypernyms: ↑microscopy …   Useful english dictionary

• dark field illumination — noun a form of microscopic examination of living material by scattered light; specimens appear luminous against a dark background (Freq. 1) • Syn: ↑dark ground illumination • Hypernyms: ↑microscopy …   Useful english dictionary

• Dark field microscopy — (dark ground microscopy) describes microscopy methods, in both light and electron microscopy, which exclude the unscattered beam from the image. As a result, the field around the specimen (i.e. where there is no specimen to scatter the beam) is… …   Wikipedia

• illumination — 1. Throwing light on the body or a part or into a cavity for diagnostic purposes. 2. Lighting an object under a microscope. [L. il lumino, pp. atus, to light up] axial i. the transmission or reflection o …   Medical dictionary

• darkfield illumination — dark ground illumination the throwing of peripheral rays of light upon a microscopical object from the side, the center rays being blocked out: the object appears bright upon a dark background. See under microscope, and see ultramicroscope …   Medical dictionary

• Critical illumination — or Nelsonian illumination is a method of specimen illumination used for transmitted and reflected light (trans and epi illuminated) optical microscopy. Critical illumination focuses an image of a light source on to the specimen for bright… …   Wikipedia

• painting, Western — ▪ art Introduction       history of Western painting from its beginnings in prehistoric times to the present.       Painting, the execution of forms and shapes on a surface by means of pigment (but see also drawing for discussion of depictions in …   Universalium

• Metallography — A micrograph of bronze revealing a cast dendritic structure Metallography is the study of the physical structure and components of metals, typically using microscopy. Ceramic and polymeric materials may also be prepared using metallographic… …   Wikipedia

• microscope — /muy kreuh skohp /, n. 1. an optical instrument having a magnifying lens or a combination of lenses for inspecting objects too small to be seen or too small to be seen distinctly and in detail by the unaided eye. 2. (cap.) Astron. the… …   Universalium

• light — I (New American Roget s College Thesaurus) I adj. airy (see levity); frivolous, jesting, jocular, lightsome; giddy, dizzy, flighty; wanton; nimble, agile; flippant, pert, insouciant; humorous; trivial. See cheerfulness, unimportance, impurity,… …   English dictionary for students