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chiasma

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chiasma
chiasma Anat. (kaɪˈæzmə) Also chiasm. [mod.L., a. Gr. χίασµα arrangement of two lines (sticks, etc.) crossed like the letter Χ (χῖ), decussation; χιάζ-ειν to mark with or like a chī (Χ, χ).] 1. Intercrossing or decussation. optic chiasma: the crossing or decussation of the fibres of the optic nerves... Oxford English Dictionary
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Chiasma (genetics)
In meiosis, absence of a chiasma generally results in improper chromosomal segregation and aneuploidy. Chiasma frequency was scored at the later diplotene-diakinesis stages of meiosis. wikipedia.org
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Chiasm
Optic chiasma) A crossing of fibres inside a nerve reversing their mapping A tendinous chiasm, the spot where two tendons cross. Chiasma (genetics), the point where two chromatids are intertwined (interwoven) in a cell An instantiation of chiasmus See also Chiasmetes, a genus wikipedia.org
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chiasmal
chiasmal, a. (kaɪˈæzməl) [f. chiasma or chiasmus or their Gr. originals + -al1.] Of the nature of chiasm or decussation.1879 Rutley Stud. Rocks xiv. 292 The chiasmal interpositions which characterise this mineral. Oxford English Dictionary
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Kiasma
Its name kiasma, Finnish for chiasma, alludes to the basic conceptual idea of its architect, Steven Holl. The competition results were announced in 1993, and the winning proposal, titled Chiasma by Steven Holl, was selected from the 516 submitted entries. wikipedia.org
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chiasm
ˈchiasm Anglicized f. chiasma, chiasmus.1870 Lightfoot Ep. Philipp. (1885) 89 The order of the clauses is reversed by the figure called chiasm. Oxford English Dictionary
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chiasmatic
chiasmatic, a. (kaɪæzˈmætɪk) [f. chiasma n.: see -atic.] 1. Anat. Of or pertaining to the optic chiasma.1912 T. L. Stedman Med. Dict. (ed. 2) 169/2 Chiasmatic.., relating to the optic chiasm. 1930 Arch. Ophthalm. III. 507 These tumors, as previously pointed out, have their point of dural attachment ... Oxford English Dictionary
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Alfred Biesiadecki
Selected publications Über das Chiasma nervorum opticorum des Menschen und der Tiere (Involving the chiasma nervorum opticorum of humans and animals) wikipedia.org
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achiasmatic
achiasmatic, a. Cytol. (eɪkaɪəzˈmætɪk) [f. a- 14 + *chiasmatic a.] Occurring without the formation of a chiasma (chiasma n. 2); having no chiasma.1962 Chromosoma XIII. 526 The occurrence of achiasmatic meiosis..in the female prompted detailed study of the behaviour of their meiotic chromosomes. 1984... Oxford English Dictionary
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Goniaea australasiae
breakage and exchange of segments of nonsister, homologous chromatids, and each such exchange event results in the formation of a cytologically visible chiasma wikipedia.org
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Decussation
Similarly, the anatomical term chiasma is named after the Greek uppercase 'Χ' (chi). In neuroanatomy, the term chiasma is reserved for crossing of- or within nerves such as in the optic chiasm. wikipedia.org
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What parts of the visual system could be responsible for a fixed, monocular scotoma? Light enters the cornea, crosses the lens, hits the retina. Electric sinal travels from retina through the optic nerve, reaches the ...
Yes. You're right. A scotoma only affecting one eye (i.e., one that is not perceived when one eye is closed) is diagnostic of a lesion upstream from the optic chiasm. See Brust's Practice of Neural Science, Fig. 3-2. The figure demonstrates a full cut, with complete blindness in one eye, but the pri...
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Achiasmate Meiosis
The formation of a chiasma is also referred to as crossing over. Without a chiasma, no recombination between homologs can occur. wikipedia.org
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Synapsis
This exchange produces a chiasma, a region that is shaped like an X, where the two chromosomes are physically joined. At least one chiasma per chromosome often appears to be necessary to stabilise bivalents along the metaphase plate during separation. wikipedia.org
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Meiomitosis
Meiotic proteins drive double stranded DNA breaks, chiasma formation, sister chromatid adhesion and rearrange the spindle apparatus.   The collision of mitosis and meiosis (first division) pathways could cause abnormal chiasma formation, abnormal cohesion expression, and mitotic/meiotic wikipedia.org
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