Liesegang rings

Liesegang rings
Secondary rings or bands resulting from rhythmic precipitation in a gel, or within a fluid-saturated rock.

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  • Liesegang rings — are a phenomenon seen in many, if not most, chemical systems undergoing a precipitation reaction, under certain conditions of concentration and in the absence of convection. HistoryThe phenomenon was first noted over one hundred years ago (in… …   Wikipedia

  • Liesegang rings — Lie·se·gang rings lē zə .gäŋ n pl a series of usu. concentric bands of a precipitate that are separated by clear spaces and that are often formed in gels by periodic or rhythmic precipitation called also Liesegang phenomenon Liesegang Raphael… …   Medical dictionary

  • Liesegang rings — Lizegango žiedai statusas T sritis chemija apibrėžtis Periodinių žiedų pavidalu gelyje išsiskyrusios nuosėdos. atitikmenys: angl. Liesegang rings rus. кольца Лизеганга …   Chemijos terminų aiškinamasis žodynas

  • Liesegang ring — ▪ chemistry       in physical chemistry, any of a series of usually concentric bands of a precipitate (an insoluble substance formed from a solution) appearing in gels (coagulated colloid solutions). The bands strikingly resemble those occurring… …   Universalium

  • Liesegang — Ralph E., German chemist, 1869–1947. See L. rings, under ring …   Medical dictionary

  • Liesegang phenomenon — the peculiar periodic formation of a precipitate in concentric banded rings, waves, or spirals when two electrolytes diffuse into and meet in a colloid gel …   Medical dictionary

  • Raphael Eduard Liesegang — (1869 1947) was a German chemist known for the discovery of Liesegang rings. He also helped develop the methods of capillary analysis, a precursor to paper chromatography …   Wikipedia

  • ring — 1. A circular band surrounding a wide central opening; a r. shaped or circular structure surrounding an opening or level area. SYN: anulus [TA]. 2. The closed ( i.e., endless) chain of atoms in a cyclic compound; commonly used for “cyclic” or… …   Medical dictionary

  • Rock City, Kansas — Rock City is a park located on hillsides overlooking the Solomon River in Ottawa County, Kansas. It is 3.6 miles south of Minneapolis, Kansas and just over 0.5 mile west of K 106 and the Minneapolis City County Airport on Ivy Road at coor… …   Wikipedia

  • Pattern formation — The science of pattern formation deals with the visible, (statistically) orderly outcomes of self organisation and the common principles behind similar patterns. In developmental biology, pattern formation refers to the generation of complex… …   Wikipedia

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