isochore


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isochore

[′ī·sə‚kȯr]
(physics)
A graph that shows the variation of one quantity with another; for example, the variation of pressure with temperature, when the volume of the substance is held constant. Also known as isochor; isometric.

isochore

[′īs·ə‚kȯr]
(genetics)
In mammals and birds, an organizational unit of chromosome DNA that is usually characterized by a fairly constant proportion of guanine-cytosine base pairs throughout its length (usually 200-1000 kilobase pairs long); genes are concentrated in the G-C rich isochores.
References in periodicals archive ?
The isochore patterns of mammalian genomes and their phylogenetic implications.
wt% NaCl, the isochores of the latter two fluids have been constructed in a P-T diagram (Figure 6(d)).
(d) Pressure-temperature diagrams and isochores of a low salinity system (full line) and an intermediate salinity system (dashed line) and estimated trapping temperature ([T.sub.t]) assuming a 1 km hydrostatic or lithostatic pressure.
Bernardi, "Isochores," in Encyclopedia of Life Sciences, John Wiley & Sons, Chichester, UK, 2012.
(2) Fluid inclusion isochores imply a large variation in fluid pressure (i.e., 0.5 to 5 kbar) during vein formation.
(1995), who concluded that the maize genome exhibits a very striking gene distribution with almost all genes present in isochores representing 10 to 20% of the genome.
Bassett, "Experimental determination of isochores of H2O in a diamond-anvil cell up to 1200 MPa and 860[degrees]C with preliminary results in the NaCl-H2O system," in Proceedings of the 4th International Symposium on Hydrothermal Reactions, pp.
Trapping pressure-temperature estimation can be made using isochores determined from the fluid inclusions [76].
Measured total homogenization temperatures are set as X, and using these values as minimum temperature, a preliminary minimum pressure P1 can be obtained from isochores. Using this value of P1, trapping temperatures could be used as X + Z.
Isochores of fluid inclusions are defined on the P-T diagram through the Flincor program with the equation proposed by Bowers and Helgeson [42].
Their peak homogenization temperatures are used to represent the lower limit of fluid temperatures, and these isochores of the C-type FIs imply that the pressure of ore-forming fluids in this stage is approximately 203 to 299 MPa at the temperature of 280-300[degrees]C (Figure 13(a)).