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Unformatted text preview: -D Molecular Shape and Vision
• When the shape changes, the molecule no longer fits with the protein,
and they separate. • This change in shape and separation from the protein contributes to
the electrical signal that travels through your neurons as vision. 8 4 Absorption spectra for retinal in the variations of
binding proteins in rods and cones The wavelength where retinal absorbs depends on the environment in which
it is in, which generates different cones. Together, the rod and cones
absorb over the entire visible region of the electromagnetic spectrum
9 How do we see stuff that is colored? White Light Wavelengths we
don t see
are absorbed We see the wavelengths that
get reflected (or transmitted)
demo 10 5 Spectroscopy
Different molecules can absorb light of different colors (energies). 11 Demo Absorption depends on
concentration 12 6 Absorption depends on concentration Absorbance = l C = molar absorptivity
l = path length
C = concentation
Labs 4 and 5 dealt with absorption of visible light and
determination of concentration.
13 How chemists use U...
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This note was uploaded on 01/24/2014 for the course CHEM 115 taught by Professor L during the Fall '02 term at Purdue University-West Lafayette.
- Fall '02