110413 - Vision and biological effects of radiation-594...

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1 CHM3400 - Lecture 37 Apr 13 Vision and biological effects of radiation (Chapter 15 586-594) Cis-trans isomerization Photochemistry Retina composed of 100 million rod-shaped cells What device in the lab would you use to differentiate wavelength?
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2 Rod cell Rhodopsin and iodopsin Convert light energy into ……………………………
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3 Visible wavelength region 40,000 L mol -1 cm -1 Very high extinction coefficient sensitive (~ 6 photons) Wavelength(i.e. color)-specific processes 390-750 nm
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4 Rhodopsin Absorption of light causes structural change opening/closing cation-specific channels generation of nerve impulse
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