
A contour line that corresponds to values measured at identical volumes. For example, a curve on a plot of gas pressure measured at different temperatures in a rigid container is an isochore.
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http://antoine.frostburg.edu/chem/senese/101/glossary/i.shtml
[genetics] In genetics, an isochore is a large region of DNA (greater than 300 kb) with a high degree uniformity in guanine (G) and cytosine (C): G- C and C-G (collectively GC content). Bernardi and colleagues first uncovered the compositional non-uniformity within vertebrate genomes using thermal melting and density gradient centrifugation...
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http://en.wikipedia.org/wiki/Isochore_(genetics)

<molecular biology> Long stretches of GC or at rich sequences of DNA associated with R and G chromosome bands respectively. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973
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