ETYMOLOGY OF THE WORD PORPHYROPSIN
From Greek porphura purple + -opsis + -in, on the model of rhodopsin.
10 ENGLISH BOOKS RELATING TO «PORPHYROPSIN»
Discover the use of
porphyropsin in the following bibliographical selection. Books relating to
porphyropsin and brief extracts from same to provide context of its use in English literature.
1.2 RHODOPSIN THE CHEMICAL COMPOSITION OF RHODOPSIN AND
PORPHYROPSIN Rhodopsin is the main pigment found in mammals, birds, and
reptiles. Its absorption spectrum in the visible, from corrected in vitro
measurements in ...
Pierre A. Buser, Michel Imbert, 1992
2
Chemsitry and Biology of Synthetic Retinoids
One example is goldfish porphyropsin, which has its \max shifted to 522 nm when
compared with frog and bovine rhodopsins, which have their \max near 500 nm.
The retinas of many vertebrates, however, have mixtures of rhodopsin and ...
Marcia I. Dawson, William H. Okamura, 1990
3
Symposium on Physiological Optics
Furthermore, as a protein carrying a highly unsaturated chromophore,
porphyropsin may be expected to stain deeply, as do the membranes, and
particularly their lamellar particles. We have measured the difference spectrum of
porphyropsin ...
4
Vertebrae Phototransduction and the Visual Cycle
FIG. 1. (A) Rhodopsin and porphyropsin absorption spectra. The rhodopsin
spectrum is from microspectrophotometry of outer segments of Bufo marinus red
rods. Data points are averaged from 15 individual spectra. The curve is an ...
5
Biology of Sensory Systems
When opsin is attached to retinall the resulting photopigment is called rhodopsin;
when it is attached to retinal; it is called porphyropsin. Rhodopsin and
porphyropsin differ in their km“. On average the 7\,,,aX of porphyropsin is 'red-
shifted' ...
6
Comparative Biochemistry V1: A Comprehensive Treatise
In all known cases rhodopsin and porphyropsin are present in the same
proportions as the retinal vitamins A from which they are derived. In consequence
of these relationships one can observe a regular displacement of Am, in the total
visual ...
7
Comparative Animal Biochemistry
Porphyropsin and vitamin A2 are found in many (but not all!) freshwater
vertebrates. They are widely found in freshwater teleosts, and in fish that migrate
between freshwater and seawater the chromophore changes with the
surroundings.
8
Readings on Color: The science of color
that the rhodopsin rods contain traces of porphyropsin and the porphyropsin rods
contain traces of rhodopsin. The difference between a rhodopsin and a
porphyropsin is that rhodopsins have 1 1 -cis retinal as the chromophore group
and ...
Alex Byrne, David R. Hilbert, 1997
9
Adaptive Mechanisms in the Ecology of Vision
In 1961, Dartnall et al, reported that in the rudd (Scardinius erythro- phthahnus)
relative proportions of rhodopsin and porphyropsin vary depending on the light
regime under which the animals are kept. Under conditions of constant lighting, ...
The biological significance of the difference between rhodopsin and
porphyropsin remains in doubt. Willmer (1956) suggested that it might be
secondary to some role of vitamin A in salt or water balance. Wald (1957, 1958)
also doubted that ...
William Stewart Hoar, David J. Randall, 1971
5 NEWS ITEMS WHICH INCLUDE THE TERM «PORPHYROPSIN»
Find out what the national and international press are talking about and how the term
porphyropsin is used in the context of the following news items.
No, These Biohackers Can't Give Themselves Infrared Vision
But fish, along with some amphibians and crustaceans that live in dark, murky waters, have another pigment called porphyropsin that's ... «Wired, Apr 15»
Dietary Experiment Claims to Successfully Extend Human Vision …
... you could increase human production and use of something called porphyropsin — the protein complex that grants near infrared (NIR) vision ... «PetaPixel, Aug 14»
Human Engineering: Augmenting Human Sight Into the Infrared …
Their goal is to use dietary restrictions and supplements to increase porphyropsin in the human eye. It is porphyropsin that would allow the eye ... «LifeNews.com, Dec 13»
Will Today's Handicapped Become Tomorrow's First Post-Human?
... see into the near infrared range through human formation of porphyropsin, the protein complex which grants infrared vision to freshwater fish. «Institute for Ethics and Emerging Technologies, Dec 13»
Shifting the Visual Spectrum: 3-dehydro retinol
The idea was that by eliminating vitamin A, these men's opsin proteins would instead bind with vitamin A2 making porphyropsin instead of ... «h+ Magazine, Sep 13»
