mosaic

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mosaic

 [mo-za´ik]
a pattern made of numerous small pieces fitted together; in genetics, occurrence in an individual of two or more cell populations each having a different chromosome complement.

mo·sa·ic

(mō-zā'ik),
1. Inlaid; resembling inlaid work.
2. The juxtaposition in an organism of genetically different tissues; it may occur normally (as in lyonization, q.v.), or pathologically, as an occasional phenomenon. From somatic mutation (gene mosaicism), an anomaly of chromosome division resulting in two or more types of cells containing different numbers of chromosomes (chromosome mosaicism), or chimerism (cellular mosaicism).
[Mod. L. mosaicus, musaicus, pertaining to the Muses, artistic]

mosaic

(mō-zā′ĭk)
n.
Biology An individual exhibiting mosaicism.

mo·sa′i·cist (mō-zā′ĭ-sĭst) n.
Referring to a sharply-defined tesselated patchwork of one ‘jig-saw’-shaped pattern imposed upon another of different color, tissue apearance or radiologic density
Genetics An individual with 2 or more genotypically or karyotypically distinct cell lines, arising from a single zygote by somatic mutation, crossing-over, or nondisjunction during mitotic division, an event more common in older mothers
Example Normal female mammal heterozygous for different alleles on the X chromosome; because of X chromosome inactivation, such females consist of two cell types, each with a different X chromosome inactivated, which results in a minor, epigenetic difference, in contrast to mosaic Turner syndrome in which some cells have no X chromosome at all
Gynaecology The mosaic pattern refers to vascular changes of interconnecting vessels resulting in a cobblestone or honeycomb surface appearance by colposcopy. Because the pattern is often associated with cervical intraepithelial neoplasia (CIN), a cervix with a mosaic pattern should be biopsied
Informatics A proprietary web browser (Mosaic), which was the first multiplatform browser for Macintosh, Windows, and UNIX. It was partially responsible for the Web’s explosive growth, but has long since faded into obscurity

mosaic

adjective A patchwork of one sharply-defined 'jig-saw'-shaped pattern imposed upon another of different color, tissue pattern or radiologic density noun Genetics An individual with 2 or more genotypically or karyotypically distinct cell lines, arising from a single zygote by somatic mutation, crossing-over, or nondisjunction during mitotic division. See Chimera, Freemartin Ob/Gyn A vascular change of interconnecting vessels resulting in a cobblestone or honeycomb surface appearance by colposcopy, the mosaic pattern is often associated with CIN and mandates biopsy.

mo·sa·ic

(mō-zā'ik)
1. Inlaid; resembling inlaid work.
2. The juxtaposition in an organism of genetically different tissues; it may occur normally (as in lyonization, q.v.), or pathologically, as an occasional phenomenon.
[Mod. L. mosaicus, musaicus, pertaining to the Muses, artistic]

mosaic

  1. any organism exhibiting a mixture of cells of different genetic makeup, such as a GYNANDROMORPH. See INACTIVE-X HYPOTHESIS. Plants showing this phenomenon are known as CHIMAERAS (1).
  2. a pattern of leaf-arrangement in a tree to maximize the exposure of the leaves to sunlight and thus the level of photosynthesis.

Mosaic

A term referring to a genetic situation, in which an individual's cells do not have the exact same composition of chromosomes. In Down syndrome, this may mean that some of the individual's cells have a normal 46 chromosomes, while other cells have an abnormal 47 chromosomes.
References in periodicals archive ?
the handicapper has had his say and put her up 10lb for that victory but Mosaicist won with plenty in hand and could have a little more up her sleeve in the British stallion studs EBF/Park suite Fillies'' Handicap.
PONTEFRACT: 2.15 Amazing Blue Sky, 2.45 Mini's Destination, 3.15 Sans Loi, 3.45 Mosaicist (nap), 4.15 Dictate, 4.45 Eshoog, 5.15 Unknown Rebel.
That suggests Mosaicist should go well for the former champion in the closing 6f handicap (9.20).
'I felt a kindred feeling with the bathing suits on the line in front of me,' he wrote, 'in the sense that they seemed to be taking no part as I was not with the activities on the beach.' Using only small brushes, Stanley crawled across the canvas painting every detail separately like a mosaicist (Fig.
KENNETH Budd was a master mosaicist whose skills and artistry brought both colour and a pointer to the past to the monochrome and modernistic Birmingham of the 1960s.
James Fanshawe, trainer of Mosaicist "The handicapper has taken no chances with her rating by sticking up her 10lb for winning at Kempton, although she did win quite nicely.
Kieren Fallon rode a fourth winner from just five rides for James Fanshawe at the track in the last five seasons as he partnered Mosaicist to a taking two-anda-quarter-length success over last week's impressive winner Speightowns Kid in the 6f handicap.
Fallon kicked off on Mosaicist, denying the Dettori-ridden Goldolphin newcomer Outsmart by a short head in the 6f maiden to the relief of trainer James Fanshawe after last week's run of six seconds.
Davidson writes of that cover as a mosaic art called the Unswept Floor, made by the most famous mosaicists, Sosos: 'Across a white background is an even scattering of debris: a wish-bone, a claw, some fruit, various discarded limbs of sea creatures, the remains of a fish.' Davidson's analysis illuminates further what we can see and should see on the piece: 'But the floor is not really the subject at all.'
In the second half of the 20th century we could stand on the platforms of the scaffold, inspect the nature of the mosaicists' achievements, and feel as if we were present at the creation.
In the late 18th century, some Vatican mosaicists began to take on private commissions and started workshops of their own, selling micromosaics to dealers and Grand Tourists.
In this work we extend our previous mosaic generation approach introducing some computational tools able to emulate the artistic "cut" often used by real mosaicists. This paper provides two kinds of cutting methods and parameters setting that control the cutting by making use of ad hoc analysis and experiments.