metamerism


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me·tam·er·ism

(me-tam'ĕr-izm),
1. A type of anatomic structure exhibiting serially homologous metameres; in primitive forms, such as the annelids, the metameres are almost alike in structure; in vertebrates, specialization in the cephalic region masks the underlying metamerism, which is still clearly evident in serially repeated vertebrae, ribs, intercostal muscles, and spinal nerves, and in young vertebrate embryos.
2. In chemistry, rarely used synonym for structural isomerism.

metamerism

(mĭ-tăm′ə-rĭz′əm)
n.
The condition of having the body divided into metameres, apparent in certain animals only in the early embryonic stages of development.

me·tam·er·ism

(me-tam'ĕr-izm)
A pattern of anatomic structure exhibiting serial repetition of homologous structures, as vertebrae, ribs, intercostal muscles, and spinal nerves.
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References in periodicals archive ?
Illuminant metamerism is when two samples having different spectral characteristics match when viewed by a normal observer under a given illuminant, but no longer match when viewed by the same observer using the same illuminating and viewing geometry but with a different illuminant.
4 a) and b) presents colour quality indices for five WLL based on the second set of LED metameric to reference DAY, and A sources respectively, as a function of the relative LED flux intensity, which is defined as ratio (B-GB)/(B+GB), where B and GB are the relative flux intensity of blue and blue-green LED respectively, as the metamerism of WLL is mainly achieved by varying the flux intensities of the blue and blue-green LED.
Metamerism, the capacity of some colors to present the same color appearance in some scenes and conditions of illumination, can raise an epistemological problem.
It has to do with metamerism, which is a phenomenon that occurs when colors change when viewed under different light sources.
Sample MHS 010130.3--possible penaeid shrimp, LACMIP Hypotype 6945--antennae very long, curving abdomen exhibiting some metamerism, pleurae vague (Figure 3)
When it comes to reproducing quality digital photos, Epson more than a year ago solved one of the most difficult technical challenges--high-quality black and white images without the effects of metamerism (a greenish effect on black and white photography).
Because standard display technology attempts to match all colors by mixing only red, green, and blue on a CRT or LCD monitor, there can be significant viewer metamerism when the monitor color is compared to real dyed or pigmented samples.
Thanks to a precise combination of pigments and dyes that display a geometric metamerism, chroma-shift parts change color, displaying what is commonly referred to as color travel or the chameleon effect.
Metamerism, heterochrony, and inflorescence morphology of the Pithecellobium complex (Leguminosae: Mimosoideae: Ingeae).
It's metamerism, a color match between two materials in which colors are identical under some lighting conditions but not under others.
It may well be that after, say, the invention of multicellularity, or the invention of metamerism, evolution was never the same again.
Many sample pairs have the capacity under one illuminant to appear identical to one another, when under another illuminant they exhibit distinct color differences (metamerism).