chiasma

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chiasma

 [ki-az´mah] (pl. chias´mata) (L.; Gr.)
in genetics, the points at which members of a chromosome pair are in contact during the prophase of meiosis and because of which recombination, or crossing over, occurs on separation. See also chiasma formation.

chi·asm

(kī'azm),
1. An intersection or crossing of two lines.
2. In anatomy, a decussation or crossing of two fibrous bundles, such as tendons, nerves, or tracts.
3. In cytogenetics, the site at which two homologous chromosomes make contact (thus appearing to be crossed), enabling the exchange of genetic material during the prophase stage of meiosis.
Synonym(s): chiasma [TA]
[G. chiasma]

chiasma

(kī-ăz′mə) also

chiasm

(kī′ăz′əm)
n. pl. chias·mata (-mə-tə) or chias·mas also chi·asms
1. Anatomy A crossing or intersection of two tracts, as of nerves or ligaments.
2. Genetics The point of contact between paired chromatids during meiosis, resulting in a cross-shaped configuration and representing the cytological manifestation of crossing over.

chi·as′mal, chi·as′mic (-măt′ĭk), chi′as·mat′ic (-măt′ĭk) adj.

chi·asm

(kīazm)
1. An intersection or crossing of two lines.
2. anatomy a decussation or crossing of two fibrous bundles, such as tendons, nerves, or tracts.
Synonym(s): chiasma.
3. cytogenetics the site at which two homologous chromosomes make contact (thus appearing to be crossed), enabling the exchange of genetic material during the prophase stage of meiosis.
Synonym(s): Budd syndrome.
[G. chiasma]

chiasma

1. The intersection and partial crossing of the optic nerves behind the eyes within the skull. The fibres on the outer halves of each optic nerve do not cross over; those on the inner halves of each nerve do. Also known as the optic chiasm.
2. The site at which a pair of homologous chromosomes exchange material during MEIOSIS.

chiasma

(pl. chiasmata) the cross-shaped configuration produced during CROSSING OVER; for example, between CHROMATIDS in MEIOSIS.

chi·asm

, chiasma (kīazm, kī-azmă)
In anatomy, decussation or crossing of two fibrous bundles, such as tendons, nerves, or tracts.
[G. chiasma]
References in periodicals archive ?
Similarly, the penultimate chapter, devoted to Andre Pieyre de Mandiargues' La Motocyclette, takes up interesting questions of circular and linear narrative structures as well as tarot rituals of birth and rebirth, but beyond the relationship of microcosmic to macrocosmic structures in the novel and the indication of a chiasmic plot structure, there is little relation between this chapter and the overarching argument of the book.
Murphy, "Chiasmic Cosmology and Atonement," Perspectives on Science and Christian Faith (2008): 214.
Yet if this longing is transempirical, as Ricoeur seems to imply, then it shares the fate of Heidegger's fundamental ontology, which he shipwrecked between the chiasmic straits of the ontic-ontological difference.
In its chiasmic structure, Johnston's note seems to urge the reader to rethink the novel she or he has just finished, and like many of his novels it encourages a reading in terms of the fluidity of boundaries between history and fiction.
The most developed metaphor in Butor's essay is the idea of travel as reading, although the analogy is constantly on the verge of turning into its chiasmic opposite: reading as travel.
This obliges us to make a modification to the chiasmic schema we presented to explain Zizek formal theory (section 3.):
It is therefore necessary to examine these fears in order to understand the regulatory practices engendered by the chiasmic slide between nature and technology that rearranges the cultural domains of subject/object as fields wherein the materialization of women's bodies limits women's opportunities for social fulfillment.
Puerto Rico was thus, in White's technically duplicitous judicial opinion, a double oxymoron, whose chiasmic structure, in the place where its identity, and its agency, ought to have been, formed literally an X.
Originally, however, it was likely parallel to line e and in chiasmic construction with it.
Alternatively, the two volumes may be chiasmic in creating a nothingness or absence at the center, between two slabs of black marks.
He wanted his readers to "feel the emotions straining against the strict form." To this poem, readers generally responded by feeling the emotions and perceiving the gaps in the form but only rarely seeing its chiasmic structure.