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BIS103_photosynthesis and Calvin Cycle addendum

BIS103_photosynthesis and Calvin Cycle addendum - Other...

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Unformatted text preview: Other pigments (e.g. carotenoids) absorb at different wavelengths and help harvesting photons Conversion of light energy to chemical energy Conversion of light energy to chemical energy T a k e h o m e m e s s a g e : • P h o t o n s g e t a b s o r b e d b y t h e d e l o c a l i z e d P- e l e c t r o n s y s t e m o f p i g m e n t s , g e t e x c i t e d t o a h i g h e r s t a t e • E x c i t e d e l e c t r o n s c a n g e t t o a l o w e r s t a t e i n f o u r w a y s : ( a ) i n t e r n a l c o n v e r s i o n ( Æ h e a t ) ( b ) f l u o r e s c e n c e ( Æ p h o t o n e m i s s i o n a t l o w e r w a v e l e n g t h , ~ 5 % o f t h e a b s o r b e d l i g h t i n p l a n t s ) ( c ) r e s o n a n c e e n e r g y t r a n s f e r ( Æ d e p i c t e d h e r e , f r o m o n e p i g m e n t t o t h e n e x t a n d f i n a l l y t o t h e r e a c t i o n c e n t e r ) ( d ) P h o t o o x i d a t i o n ( Æ d e p i c t e d h e r e , i n t h e r e a c t i o n c e n t e r , t h...
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