Download Waves and Fields in Optoelectronics by Hermann A. Haus PDF
By Hermann A. Haus
Sequence: Prentice-Hall sequence in good kingdom actual electronics
Hardcover: 402 pages
Publisher: Prentice corridor (September 1983)
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Extra info for Waves and Fields in Optoelectronics
It is a quantitative question. In Russell Van Gelder’s vitamin A-deprived mice there may or may not be enough vitamin A left to support this function. We really don’t know. Foster: As it turns out those initial criticisms were correct, and this raises an important general issue. You cannot base a conclusion on ‘negative data’. You can’t prove a negative. When we made the rd/rd cl mouse, we found no evidence for functional rods and cones using exquisitely sensitive techniques. But we could not prove that they were none there.
Cahill: I have a question relating to the human variants. If you have both a photopigment and a photoisomerase that are necessary for the response, you shouldn’t be able to get a univariant action spectrum. Is this true? I thought you were suggesting the possibility that the reason the melanopsin knockouts had a subtle e¡ect was that melanopsin was necessary as a photoisomerase. Foster: I was suggesting that an attenuated response in a melanopsin knock-out could not distinguish between the ablation of melanopsin acting as a photosensory pigment or as an element of the phototransduction system.
The outer retinal photoreceptors (rods and cones) are not necessary for photic signalling to the SCN and pupillary constriction centres . A subset of melanopsin-containing retinal ganglion cells are directly photosensitive . Near-total vitamin A depletion of the eye does not signi¢cantly decrease photic signalling to the SCN, as measured by photic immediate-early gene induction . Retinal-degenerate mice lacking cryptochromes show markedly decreased behavioural photoresponses and pupillary responses, while non-degenerate mice lacking cryptochromes show intact photic signalling .