rhodopsin

noun

rho·dop·sin rō-ˈdäp-sən How to pronounce rhodopsin (audio)

: a red photosensitive pigment in the retinal rods of the eye of most vertebrates that is important in vision in dim light

called also visual purple

Example Sentences

Recent Examples on the Web Vitamin A is also a component of the protein rhodopsin, which allows the eye to see in the dark.

Korin Miller, Good Housekeeping, 12 Nov. 2021 All rods contain the same type of photopigment, called rhodopsin.

Gabriel A. Silva, Forbes, 20 May 2021 Altogether, researchers have uncovered about 1000 other varieties of the proteins in various animals and microbes since rhodopsin was discovered more than 150 years ago.

Mitch Leslie, Science | AAAS, 2 Apr. 2020 Some use chlorophyll to convert sunlight during photosynthesis and others use rhodopsins, proteins that bind to a form of vitamin A called retina to capture light.

Shandria Sutton, Science | AAAS, 5 July 2018

Word History

Etymology

borrowed from German Rhodopsin, from rhod- rhod- + Greek ópsis "appearance, sight, vision" + German -in -in entry 1 — more at optic entry 1

Note: Term introduced by the German physiologist Wilhelm Kühne (1837-1900) and his assistant August Ewald (1849-1924) in "Untersuchungen über den Sehpurpur," Untersuchungen aus dem Physiologischen Institute der Universität Heidelberg, 1. Band (1878), p. 181: "Was den Sehpurpur im Dunkel ändert, pflegt es z. Th. in derselben Weise zu thun, wie das Licht, d.h. erst eine gelbe Materie, dann farblose Substanz hervorzubringen. Der Kürze wegen und um dem Auslande unsere Bezeichnungen zugänglich zu machen, kann man sagen, Rhodopsin werde erst in Xanthopsin, dieses in Leukopsin zersetzt." ("Those things [i.e., reagents] that convert visual purple in darkness in part act in the same manner as light, that is, they first produce a yellow material, then a colorless substance. For the sake of brevity, and in order to make our designations more accessible to foreigners, we can say that rhodopsin is first broken down into xanthopsin ['visual yellow'], and this into leucopsin ['visual white'].") Kühne's selection of the combining element rhod-, usually meaning "red," is somewhat idiosyncratic, given that he is rendering German Sehpurpur ("visual purple") and not Sehrot ("visual red").

First Known Use

1878, in the meaning defined above

单词	rhodopsin
释义	rhodopsin noun rho·dop·sin rō-ˈdäp-sən : a red photosensitive pigment in the retinal rods of the eye of most vertebrates that is important in vision in dim light called also visual purple Example Sentences Recent Examples on the Web Vitamin A is also a component of the protein rhodopsin, which allows the eye to see in the dark. Korin Miller, Good Housekeeping, 12 Nov. 2021 All rods contain the same type of photopigment, called rhodopsin. Gabriel A. Silva, Forbes, 20 May 2021 Altogether, researchers have uncovered about 1000 other varieties of the proteins in various animals and microbes since rhodopsin was discovered more than 150 years ago. Mitch Leslie, Science \| AAAS, 2 Apr. 2020 Some use chlorophyll to convert sunlight during photosynthesis and others use rhodopsins, proteins that bind to a form of vitamin A called retina to capture light. Shandria Sutton, Science \| AAAS, 5 July 2018 Word History Etymology borrowed from German Rhodopsin, from rhod- rhod- + Greek ópsis "appearance, sight, vision" + German -in -in entry 1 — more at optic entry 1 Note: Term introduced by the German physiologist Wilhelm Kühne (1837-1900) and his assistant August Ewald (1849-1924) in "Untersuchungen über den Sehpurpur," Untersuchungen aus dem Physiologischen Institute der Universität Heidelberg, 1. Band (1878), p. 181: "Was den Sehpurpur im Dunkel ändert, pflegt es z. Th. in derselben Weise zu thun, wie das Licht, d.h. erst eine gelbe Materie, dann farblose Substanz hervorzubringen. Der Kürze wegen und um dem Auslande unsere Bezeichnungen zugänglich zu machen, kann man sagen, Rhodopsin werde erst in Xanthopsin, dieses in Leukopsin zersetzt." ("Those things [i.e., reagents] that convert visual purple in darkness in part act in the same manner as light, that is, they first produce a yellow material, then a colorless substance. For the sake of brevity, and in order to make our designations more accessible to foreigners, we can say that rhodopsin is first broken down into xanthopsin ['visual yellow'], and this into leucopsin ['visual white'].") Kühne's selection of the combining element rhod-, usually meaning "red," is somewhat idiosyncratic, given that he is rendering German Sehpurpur ("visual purple") and not Sehrot ("visual red"). First Known Use 1878, in the meaning defined above Medical Definition rhodopsin noun rho·dop·sin rō-ˈdäp-sən : a red photosensitive pigment in the retinal rods of marine fishes and most higher vertebrates that is important in vision in dim light, is quickly bleached by light to a mixture of opsin and retinal, and is regenerated in the dark called also visual purple
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rhodopsin

noun

Example Sentences

Word History

Medical Definition

noun