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Retinal

retinal

1. (Science: anatomy) Pertaining to the retina.

2. (Science: biochemistry) The aldehyde of retinol, derived by the oxidative enzymatic splitting of absorbed dietary carotene and having vitamin A activity. In the retina, retinal combines with opsins to form visual pigments. One isomer, 11 cis retinal combines with opsin in the rods (scotopsin) to form rhodopsin or visual purple. Another, all trans retinal (trans r.), visual yellow, xanthopsin) results from the bleaching of rhodopsin by light, in which the 11 cis form is converted to the all trans form. Retinal also combines with opsins in the cones (photopsins) to form the three pigments responsible for colour vision.


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... human physiology, you will know that the cones in the eye have three different proteins for red, blue and red, but all three are bound to the same retinal molecule. because the retinal is in a different environemnt(surrounded by different proteins) it can absorb different wavelengths of light. ...

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by MrMistery
Sat Dec 06, 2008 3:18 pm
 
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how do proton pumps help regulate the size of stomata?

... pump is involved, not one in the tylakoid membrane. When blue light hits zeaxanthin, it triggers an isomerisation reaction similar to that of retinal in the animal eye. This reaction triggers a membrane transduction reaction involving a protein similar with cytochrome P450 that ultimately ...

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by MrMistery
Thu Jan 10, 2008 1:49 pm
 
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The Fiber Disease

... [277.1-66] __ Psychosis [277.1-67] __ Restlessness [277.1-68] __ Respiration, decreased [277.1-69] __ Respiratory paralysis [277.1-70] __ Retinal artery spasm [277.1-71] __ Seizures (convulsions) [277.1-72] __ Sensory disorders [277.1-73] __ Skin lesions, blisters, or ulcers [277.1-74] ...

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by London
Thu Jan 18, 2007 2:39 pm
 
Forum: Human Biology
Topic: The Fiber Disease
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by msc
Sat Dec 16, 2006 2:08 am
 
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by msc
Tue Dec 12, 2006 9:41 pm
 
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