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visual purple |
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visual purple: see vision vision, physiological sense of sight by which the form, color, size, movements, and distance of objects are perceived.
Vision in HumansThe human eye functions somewhat like a camera; that is, it receives and focuses light upon a photosensitive ..... Click the link for more information. . rhodopsinor visual purpleLight-sensitive, purple-red organic pigment contained in the rod cells of the retina that allows the eye to see in black and white in dim light. It is composed of opsin, a protein, linked to retinal, a conjugated molecule (see conjugation) formed from vitamin A. Photons of light that enter the eye are absorbed by retinal and cause it to change its configuration, starting a biochemical chain of events that ends with impulses being sent along the optic nerve to the brain. In bright light, to protect rod cells from overstimulation, rhodopsin breaks down into retinal and opsin, both of which are colourless. In dim light or darkness the process is reversed (dark adaptation), and purple-red rhodopsin is reformed. Similar light-sensitive compounds made of retinal and other opsin proteins are the pigments in the retina's cone cells responsible for colour vision in bright light. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Members of the Karta team include strategic partners CACI, SRA, and IBM; and product and service providers 3DSolve, Advancia, Alion Science, Allen Interactions, Brainshark, Carney, Coastal, CollabWorx, CompeteNet, Eagle Systems, EG&G, Envisage, FC Business Systems, Information Experts, Intergraph, LMR, MTS Technologies, NGRAIN, Orion Technology, Pinneast, SIMmersion, Sparta, Stanley Associates, SumTotal, The Logistics Company, Thomson NETg, and Visual Purple. In addition to 3Dsolve, the Karta DLETP team includes a prestigious list of firms: Advancia, Alion Science & Technology, Allen Interactions, Brainshark, CACI, Carney, Coastal, CollabWorx, CompeteNet, Eagle Systems, EG&G, Envisage, FC Business Systems, IBM, Information Experts, LMR, MTS Technologies, NGRAIN, Orion, Pinneast, SIMmersion, Sparta, SRA, Stanley Associates, SumTotal, The Logistics Company, Thomson NETg, and Visual Purple. In addition to NGRAIN, the Karta team includes a prestigious list of members: CACI, SRA, IBM, Allen Interactions, Carney, Coastal, CollabWorx, Eagle Systems, FC Business Systems, Information Experts, Pinneast, SIMmersion, SumTotal, The Logistics Company, Thomson NETg, Visual Purple, Advancia, 3Dsolve, Orion, LMR, CompeteNet, Stanley Associates, MTS Technologies, Alion Science & Technology, Intergraph, EG&G, Sparta, Envisage, and Brainshark. |
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