Crossword clues for retinal
retinal
The Collaborative International Dictionary
Retinal \Ret"i*nal\, a. (Anat.) Of or pertaining to the retina.
Retinal purple (Physiol. Chem.), the visual purple.
Retinal \Ret"i*nal\, n. (Chem.) A retinoid compound ( C20H28O), closely related to vitamin A, which is a component of the visual pigments in the eye. It is also called retinaldehyde and vitamin A aldehyde.
Douglas Harper's Etymology Dictionary
Wiktionary
a. Of or pertaining to the retina. n. (context biochemistry English) One of several yellow or red carotenoid pigments formed from rhodopsin by the action of light; retinene
WordNet
adj. in or relating to the retina of the eye; "retinal cells"
n. either of two yellow to red retinal pigments formed from Rhodopsin by the action of light [syn: retinene]
Wikipedia
Retinal is also known as retinaldehyde. It was originally called retinene, and renamed afterwards it was discovered to be vitamin A aldehyde. Retinal is one of the many forms of vitamin A (the number of which varies from species to species). Retinal is a polyene chromophore, bound to proteins called opsins, and is the chemical basis of animal vision. Retinal allows certain microorganisms to convert light into metabolic energy.
Vertebrate animals ingest retinal directly from meat, or they produce retinal from carotenoids, either from one of two carotenes ( α-carotene, β-carotene) or from β-cryptoxanthin, a type of xanthophyll. These carotenoids must be obtained from plants or other photosynthetic organisms. No other carotenoids can be converted by animals to retinal, and some carnivores cannot convert any carotenoids at all. The other main forms of vitamin A, retinol, and a partially active form, retinoic acid, may both be produced from retinal.
Invertebrates such as insects and squid use hydroxylated forms of retinal in their visual systems, which derive from conversion from other xanthophylls.
Usage examples of "retinal".
Liebreich found examples of retinal hemorrhage in suppressed menstruation, and Sir James Paget says that he has seen a young girl at Moorfields who had a small effusion of blood into the anterior chamber of the eye at the menstrual period, which became absorbed during the intervals of menstruation.
In the Annual of the Universal Medical Sciences, 1888, there is a report of seven cases of retinal injury with central scotoma, amblyopia, etc.
He decelerated, put Sigurd Magsman down, and switched on the retinal light in his eyes, trying to pierce the wombgloom.
I sat at a console while the armaments safe checked my fingerprints, took breath samples and a retinal blood spectrogram, ran some perception-and-judgment response time tests, then quizzed me for five minutes about the case.
Kuhne and Steiner is that immediately on the stoppage of light there is sometimes a sudden increase in the retinal current, before the usual recovery takes place.
However, meanings of signals from some types of sensory cells are necessarily position-dependent: the position of a retinal receptor relates to its position in the image projected onto the retina, the position of a receptor for touch is its actual position on the body, and the position of a receptor for sound in the organ of Corti is a function of frequency.
When he scanned around with his retinal insets on infrared the geometric buildings were a uniform temperature.
She snatched the retinal projection goggles from her face and studied a little display inset into the bracelet.
But cerebral and retinal scanning were painless, and one never felt the acupuncture that deadened the leg for the blood, bone marrow, and tissue samples.
There is a bonus fir you both in the local branch of the Imperial Bank, account code 6,51374, keyed to your retinal scan.
Then I saw something in a blink of an eye, more a retinal echo than a true vision: two figures locked in a violent embrace, images reversed like a negative of an ancient photograph, sudden, violent motion, another sonic boom, a flash of white that blinded me even before the image had registered in my brain -- spikes, thorns, two heads butting together, six arms flailing, sparks flying, a human form and something larger, the sound of metal rending, the sound of something or someone screaming with a voice louder than the sirens wailing on .
Due to the manner in which Ellen Cherry automatically looked at landscapes, squinting and widening, focusing and fuzzing, employing her eye game to drag God's patio furniture from one retinal lanai to another, she probably would have missed it.
Ices had garbaged the death record and supered on Marlowe's face, fingerprints, retinals, and all other distinguishing features.
In fact, it will be ongoing, and it involves a general warrant, along with a profile of your ship and its internal identification numbers, a retinal print and voice print, which we'll take before you return to dockside, and all this will be passed to Wyatt's Star Combine and Mariner through diplomatic and military channels.
In fact, it will be ongoing, and it involves a general warrant, along with a profile of your ship and its internal identification numbers, a retinal print and voice print, which we’.