10-27-08 photosynthesis

10-27-08 photosynthesis - Photosynthesis I. Light Capture:...

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Photosynthesis I. Light Capture: a. Conversion of light energy to chemical energy i. Light reactions 1. The first step in creating light energy a. Absorption of a photon of light b. The main pigment of photosynthesis is chlorophyll i. Planar ring ii. Conjugated double bonds 1. Changes the absorption of the molecule iii. Mg in center iv. Phytol tail c. Light i. Different coors ii. Different wavelengths iii. Different energies per quantum 1. Red has lowest energy, blue has most d. Atoms/molecules i. Different structures ii. Different electron orbitals iii. Different energies per orbital jump 1. Absorption of a photon moves an electron to a higher state
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2. The structure of chlorophyll specifically allows absorption of blue and red photons e. Why is chlorophyll green? i. It reflects the green photons f. Excited state electrons can: i. Fluoresce (release light photon) ii. Lose energy to solvent as heat iii. Move to nearby electron acceptor 1. If the electron moves, light has pumped electron from chlorophyll
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This note was uploaded on 10/14/2009 for the course BIS 64982 taught by Professor Comai during the Spring '09 term at UC Davis.

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10-27-08 photosynthesis - Photosynthesis I. Light Capture:...

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