CHAPTER 12 MEASUREMENTS WITH THE MINI-PAM
on all features of the the induction curves. This aspect is particularly
relevant for endosymbiotic phycobionts, as O
2
is consumed by their
own and the host's dark-respiration and O
2
-diffusion is restricted (see
recent report by Schreiber, Gademann, Ralph and Larkum:
Assessment of photosynthetic performance of Prochloron in
Lissoclinum patella in hospite by chlorophyll fluorescence
measurements. Plant Cell Physiol. 38(8), 945-951, 1997).
12.3.12 Repetition Clock (menu point 28: REP-CLOCK and double
key function ON+MEM)
The Repetition Clock is primarily meant to trigger saturation
pulses for YIELD-determination at defined time intervals which are
set in menu position 30: CLK-TIME. The standard interval of 20 s is
appropriate for the recording of fluorescence induction curves with
repetitive YIELD-determination. The CLOCK can be started/stopped
in menu position 28 via SET. Then on the display the remaining time
to the next start of a function is shown. Start/Stop of the CLOCK is
also possible in other menu positions via the double key operation
ON+MEM.
Besides YIELD-measurements also other functions can be
repetitively triggered by the CLOCK. For this purpose the MODE-
menu point 29 (CLOCK-ITEM) is provided which allows to choose
between:
1: SATURATION PULSE (SAT)
2: ACT+YIELD (A+Y)
3: LIGHT CURVE (LC)
4: L-CURVE+REC. (LC+)
5: INDUCTION-CURVE (IC)
85
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