opaque zone


opaque zone
a dark zone in an otolith that, relative to other zones, restricts the passage of light. Under reflected light this zone appears bright

Dictionary of ichthyology. 2009.

Look at other dictionaries:

  • Zone plate — A zone plate is a device used to focus light. Unlike lenses however, zone plates use diffraction instead of refraction. Created by Augustin Jean Fresnel [freɪ nel] , they are sometimes called Fresnel zone plates in his honor. The zone plate s… …   Wikipedia

  • zone melting — a process of purifying any of various metals and other materials, as germanium or silicon, by passing it in bar form through an induction coil. Also called zone refining. Cf. cage zone melting. [1955 60] * * * Any of a group of techniques used to …   Universalium

  • opaque region — neskaidrumo sritis statusas T sritis radioelektronika atitikmenys: angl. opacity zone; opaque region vok. Undurchlässigkeitsgebiet, n rus. область непрозрачности, f; полоса непрозрачности, f pranc. région d opacité, f; zone d opacité, f …   Radioelektronikos terminų žodynas

  • zone plate — noun : an optical device that consists of a series of concentric opaque rings of such width that rays from alternate half period elements are cut off and that has some properties of a converging lens * * * Optics. a plate or screen with… …   Useful english dictionary

  • opaque — (see winter zone) A growth zone that inhibits passage of light and forms part of the annual growth pattern that usually represents a period of slower growth; often referred to as the winter zone; on otoliths it appears dark under transmitted… …   Fisheries — dictionary

  • zone d'opacité — neskaidrumo sritis statusas T sritis radioelektronika atitikmenys: angl. opacity zone; opaque region vok. Undurchlässigkeitsgebiet, n rus. область непрозрачности, f; полоса непрозрачности, f pranc. région d opacité, f; zone d opacité, f …   Radioelektronikos terminų žodynas

  • zone plate — Optics. a plate or screen with alternating opaque and transparent concentric rings that focus light by diffraction. [1895 1900] * * * …   Universalium

  • zone plate — noun a glass plate marked out into concentric rings that are alternately transparent and opaque, used like a lens to focus light …   English new terms dictionary

  • hyaline zone — a zone on an otolith that allows more light to pass than an opaque zone. Also called translucent zone, the preferred term …   Dictionary of ichthyology

  • annual growth zone — All growth on a structure which forms during one year; consisting of an opaque (generally winter zone) and a translucent (generally summer zone) …   Fisheries — dictionary


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