BIOLOGY 3B03 Lecture Notes - Lecture 12: Energy, Adaptive Capacity, Radiant Energy
8 Apr 2018
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Excitation energy transferred via resonance transfer (forster transfer named after scientist) Transfer is non-radiative (no photon emission) and it is purely physical (no chemical changes). Analogy: two tuning forks, one struck and placed beside another that is not struck. If the two are close enough and depending on their pitch and orientation, the second one will begin to vibrate 95-99% of photons absorbed by antenna pigments will transfer energy to a reaction centre where they can be used for photochemistry. The first chemical reaction takes place in the reaction centre. Energy transfer is largely physical through vibrational energy. Efficient process organize pigments in certain fashion. Number of chlorophyll or light harvesting capacity in building single reaction center. Effi(cid:272)ie(cid:374)(cid:272)(cid:455) (cid:373)ea(cid:374)s do(cid:374)"t (cid:374)eed light to hit (cid:396)ight (cid:272)hlo(cid:396)oph(cid:455)ll, (cid:272)a(cid:374) hit a(cid:374)(cid:455) Most reaction centers can be busy most of the time. Chlorophyll pigments & reaction centers are close together in multi-protein complexes.
