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In this example, the spectrometer was configured with
an exciting light peaking at 720 nm to induce an
excitation of PSI only with a detecting light of 705 nm.
Cut-off filters are placed in front of the measuring photo
diode to detect the light up 695 nm.
The curves plotted (figure 2) were realised under the
same conditions on a dark adapted young spinach and
on a light adapted young spinach (pre-illumination at
630nm during 3 minutes to activate the Benson Calvin
cycle)

On the dark adapted leaf, the calvin benson cycle is
not activated, the cyclic electron flow is enhanced and
a competition between reduction and oxidation of P700
is traduced by signal variations during the illumination
with the actinic light.
On the light adapted leaf, the calvin benson cycle is
activated enhancing the linear electron flow during the
illumination.
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