allocyclicadj.

Brit.

/ˌaləˈsʌɪklɪk/, U.S.

/ˌæləˈsɪklɪk/,

/ˌæləˈsaɪklɪk/

Origin: Formed within English, by compounding. Etymons: allo- comb. form, cyclic adj.

Etymology: < allo- comb. form + cyclic adj.

1. Genetics. Of a chromosome or part of one: showing a pattern of condensation and expansion through the cell cycle that is out of synchrony with the bulk of the chromosomal material. Also: relating to or involving such a chromosome.

ΚΠ

1940 Jrnl. Genetics 40 204 Heterochromatin is allocyclic. Euchromatin has a regular correlation of nucleic acid attachment and reproductive cycle. Heterochromatin either has a reduced correlation or a reversed one.

1971 Ann. Rev. Ecol. & Systematics 2 334 The allocyclic segments may be either more or less condensed than the eucyclic segments at any given time.

1992 Proc. National Acad. Sci. U.S.A. 89 6938/1 The molecular basis and the biological significance of allocyclic behavior of sex chromosomes during mammalian spermatogenesis are poorly understood.

2002 S. Schwartz & C. G. Palmer in K. D. McClatchey Clin. Lab. Med. (ed. 2) xxix. 562/2 Heterochromatin..remains condensed telophase and remains visible during interphase. This out-of-phase or allocyclic behavior..is also reflected in its DNA synthesis, which occurs late in the replication of the chromosome.

2. Geology. Designating cyclic or repetitive patterns of deposition within a sedimentary system which are attributed to factors external to the system. Also: relating to or involving such a factor. Cf. autocyclic adj. 2.

ΚΠ

1964 J. R. Beerbower in Bull. State Geol. Surv. Kansas 169 32/2 The..allocyclic type result from changes external to the sedimentary unit such as uplift, subsidence, climatic variation or eustatic change.

1993 Palaios 8 77/1 These formation-scale changes probably resulted from allocyclic factors including changes in tectonic activity and climate.

2007 J. A. Maceachern et al. in W. Miller Trace Fossils vii. 119/1 In genetic stratigraphy, differentiation of breaks of autocyclic derivation from those of allocyclic origin is paramount.

This is a new entry (OED Third Edition, September 2012; most recently modified version published online December 2021).

单词	allocyclic
释义	allocyclicadj. Brit. /ˌaləˈsʌɪklɪk/, U.S. /ˌæləˈsɪklɪk/, /ˌæləˈsaɪklɪk/ Origin: Formed within English, by compounding. Etymons: allo- comb. form, cyclic adj. Etymology: < allo- comb. form + cyclic adj. 1. Genetics. Of a chromosome or part of one: showing a pattern of condensation and expansion through the cell cycle that is out of synchrony with the bulk of the chromosomal material. Also: relating to or involving such a chromosome. ΚΠ 1940 Jrnl. Genetics 40 204 Heterochromatin is allocyclic. Euchromatin has a regular correlation of nucleic acid attachment and reproductive cycle. Heterochromatin either has a reduced correlation or a reversed one. 1971 Ann. Rev. Ecol. & Systematics 2 334 The allocyclic segments may be either more or less condensed than the eucyclic segments at any given time. 1992 Proc. National Acad. Sci. U.S.A. 89 6938/1 The molecular basis and the biological significance of allocyclic behavior of sex chromosomes during mammalian spermatogenesis are poorly understood. 2002 S. Schwartz & C. G. Palmer in K. D. McClatchey Clin. Lab. Med. (ed. 2) xxix. 562/2 Heterochromatin..remains condensed telophase and remains visible during interphase. This out-of-phase or allocyclic behavior..is also reflected in its DNA synthesis, which occurs late in the replication of the chromosome. 2. Geology. Designating cyclic or repetitive patterns of deposition within a sedimentary system which are attributed to factors external to the system. Also: relating to or involving such a factor. Cf. autocyclic adj. 2. ΚΠ 1964 J. R. Beerbower in Bull. State Geol. Surv. Kansas 169 32/2 The..allocyclic type result from changes external to the sedimentary unit such as uplift, subsidence, climatic variation or eustatic change. 1993 Palaios 8 77/1 These formation-scale changes probably resulted from allocyclic factors including changes in tectonic activity and climate. 2007 J. A. Maceachern et al. in W. Miller Trace Fossils vii. 119/1 In genetic stratigraphy, differentiation of breaks of autocyclic derivation from those of allocyclic origin is paramount. This is a new entry (OED Third Edition, September 2012; most recently modified version published online December 2021). < adj.1940
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