Lecture_25_Nov21_2011

Lecture_25_Nov21_2011 - Introduction to Biophysics Lecture...

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Introduction to Biophysics Lecture 25 Photosynthesis Electron transfer
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Quizzes statistics (correct solution to quiz problems) 1 student - 82% 2 students – 42% 2 students - 36%
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Intermolecular energy transfer - energy transfer by radiation - by inductive resonance - by charged carriers
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Förster Resonance Energy Transfer (FRET) Theodore Förster, 1948 The rate of energy transfer from excited molecule i (donor) to another molecule j (acceptor): ( 29 ( 29 [ ] 6 2 ˆ ˆ ˆ ˆ 3 ˆ ˆ ij ij j ij i j i ij ij R R R S k - = μ S ij ensures that energy conservation law is satisfied dipole-dipole interaction - unit vector in the direction of transition dipole moment R ij - distance between donor and acceptor R ij - unit vector in the direction from donor to acceptor S ij - overlap between energy states of acceptor and donor
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Photosynthetic membrane:
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Type II RC Photosystem II Type I RC Photosystem I + . -
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Lecture_25_Nov21_2011 - Introduction to Biophysics Lecture...

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