polytopicadj.

Brit.

/ˌpɒlɪˈtəʊpɪk/, U.S.

/ˌpɑliˈtoʊpɪk/

Origin: A borrowing from Greek, combined with English elements. Etymons: poly- comb. form, Greek τόπος , -ic suffix.

Etymology: < poly- comb. form + ancient Greek τόπος place (see topic adj.) + -ic suffix. In sense 1 after French polytopique (J. I. Briquet 1901, in Ann. du Conservatoire et du Jardin Botanique de Genève 5 ii. ii. 63); compare German polytop (1903 or earlier).

1. Biology. Of or relating to the independent origin of a species in a number of different places.

ΘΚΠ

the world > life > biology > biological processes > evolution > [adjective] > polytopic

polytopic1904

1904 Bot. Gaz. 37 312 The first chapter deals with fundamental principles and motives, such as the origin of species, plant migrations, and polytopic appearance of species.

1939 Geogr. Jrnl. 93 271 We are forced to fall back on the theory of polyphyletic and polytopic evolution.

1970 Watsonia 8 143 The distribution of the hexaploids in Britain does not show any obvious pattern..,and this agrees with Rousi's suggestion that hexaploids have had a polytopic origin from the tetraploids.

2004 Molecular Ecol. 13 349 Arabis × divaricarpa was found to be of recent and polytopic origin, a result consistent with its presumed hybrid origin.

2. Cell Biology. Designating a protein that is an integral part of a biological membrane, which it traverses two or more times (so that different segments of the same protein are exposed adjacent to each other on the extracellular and cytoplasmic faces of the membrane).

ΘΚΠ

the world > life > biology > substance > proteins > [adjective]

proteinaceous1844

proteinous1844

proteinic1876

native1931

glycosyl1945

glycosylated1945

microtrabecular1976

polytopic1980

1980 G. Blobel in Proc. National Acad. Sci. U.S.A. 77 1497 The polypeptide chain of bitopic and polytopic IMPs [= integral membrane proteins] is bilateral in nature, containing two or multiple hydrophilic domains, respectively, exposed at opposite sides of the membrane.

2000 New Scientist 2 Dec. 89/2 (advt.) Interactions of polytopic transporters and their essential monotopic binding partners.

This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).

单词	polytopic
释义	polytopicadj. Brit. /ˌpɒlɪˈtəʊpɪk/, U.S. /ˌpɑliˈtoʊpɪk/ Origin: A borrowing from Greek, combined with English elements. Etymons: poly- comb. form, Greek τόπος , -ic suffix. Etymology: < poly- comb. form + ancient Greek τόπος place (see topic adj.) + -ic suffix. In sense 1 after French polytopique (J. I. Briquet 1901, in Ann. du Conservatoire et du Jardin Botanique de Genève 5 ii. ii. 63); compare German polytop (1903 or earlier). 1. Biology. Of or relating to the independent origin of a species in a number of different places. ΘΚΠ the world > life > biology > biological processes > evolution > [adjective] > polytopic polytopic1904 1904 Bot. Gaz. 37 312 The first chapter deals with fundamental principles and motives, such as the origin of species, plant migrations, and polytopic appearance of species. 1939 Geogr. Jrnl. 93 271 We are forced to fall back on the theory of polyphyletic and polytopic evolution. 1970 Watsonia 8 143 The distribution of the hexaploids in Britain does not show any obvious pattern..,and this agrees with Rousi's suggestion that hexaploids have had a polytopic origin from the tetraploids. 2004 Molecular Ecol. 13 349 Arabis × divaricarpa was found to be of recent and polytopic origin, a result consistent with its presumed hybrid origin. 2. Cell Biology. Designating a protein that is an integral part of a biological membrane, which it traverses two or more times (so that different segments of the same protein are exposed adjacent to each other on the extracellular and cytoplasmic faces of the membrane). ΘΚΠ the world > life > biology > substance > proteins > [adjective] proteinaceous1844 proteinous1844 proteinic1876 native1931 glycosyl1945 glycosylated1945 microtrabecular1976 polytopic1980 1980 G. Blobel in Proc. National Acad. Sci. U.S.A. 77 1497 The polypeptide chain of bitopic and polytopic IMPs [= integral membrane proteins] is bilateral in nature, containing two or multiple hydrophilic domains, respectively, exposed at opposite sides of the membrane. 2000 New Scientist 2 Dec. 89/2 (advt.) Interactions of polytopic transporters and their essential monotopic binding partners. This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022). < adj.1904
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