kevin reiling sctkr at
Tue Dec 17 05:45:44 EST 1996

On 16 Dec 1996 23:49:30 -0800 
bluej at wrote:
>Help??!  My biology class has a 
question; why does a lot of 
>in a container look red?  etc.

You are observing the phenomena 
of chlorophyll fluorescence. On 
capture of a photon chlorophyll 
becomes excited and in theory this 
energy is passed into the 
photosynthetic pathway. Not all of 
this energy goes through these 
pathways, however, some is 
re-emitted as red light as the 
chlorophyll returns to ground state. 
The red light corresponds to the 
energy loss from the lowest energy 
level to ground state, from memory I 
think this is 694nm (but my memory 
is not perfect). Hope this helps, 
most plant texts will have extra 
Best wishes Kevin

Dr Kevin Reiling
Division of Biology
Staffordshire University

01782 294746

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