Version:
P700 & Chlorophyll Fluorescence Measuring System
DUAL-PAM-100 control unit (left) with near infrared emitter head and P700/fluorescence detector head connected to an optical unit type ED-101US/MD.
DUAL-PAM-100 – P700 & Chlorophyll Fluorescence Measuring System
Front view of FIBER version of DUAL-PAM-100 (DUAL-PAM/F).
Close-up: Near infra-red emitter unit (DUAL-E, upper right corner in each picture) and detector unit (DUAL-DB or DR, lower left corner in each picture) connected to a special optical unit for measurement of suspensions (ED-101US/MD).
Close-up: Near infra-red emitter unit (DUAL-E, upper right corner in each picture) and detector unit (DUAL-DB or DR, lower left corner in each picture) connected to a special optical unit for measurement of suspensions (ED-101US/MD).
Immediately after its market launch, the DUAL-PAM-100 became the gold standard for parallel recording of photosystem II and photosystem I activities. The DUAL-PAM-100 excels by its outstanding opto-electronical properties which are based on the use of latest-generation components and precision engineering.
The basic system consists of a high performance PAM chlorophyll fluorometer to analyze photosystem II, and a dual wavelength absorbance spectrometer to analyze photosystem I. A ground-breaking pulse-modulation technique has been developed to measure these two signals concurrently and at outstandingly high time resolution.
In principle, the system measures a single-channel signal together with a two-channel difference signal. In the basic system, these two signals are PAM fluorescence of photosystem II, and the absorption change of photosystem I. The DUAL-PAM-100 is not confined to the analyses of photosystems I and II. For instance, the accessory “P515/535 emitter-detector module” measures scattering changes as single-channel absorption signal at 535 nm, and the electrochromic band shift of membrane energization as two-channel signal with 515 nm as sample and 550 nm as reference wavelength.
Informational Video
The DUAL-PAM measuring system is available as MODULAR Version (DUAL-PAM-100) and as FIBER Version (DUAL-PAM/F). The MODULAR Version has light sources and signal detection located in separate measuring heads, the sample is placed between measuring heads, and photosystem I absorption changes are measured in the transmission mode. The FIBER Version has light sources and signal detection in the central unit, the sample is placed in front of the fiber optics, and photosystem I absorption changes are measured in the remission mode.
The measuring heads of the MODULAR version can be easily exchanged. Using various accessory modules, the MODULAR VERSION can measure the electronic band shift caused by membrane energization, NADPH fluorescence, fluorescence of pH-sensitive dyes, and fluorescence at two different wavebands. The FIBER version lacks this flexibility but may be advantageous when only photosystem II and photosystem I activities are of interest.