Archive for February, 2011

Measuring Photorespiration with the LI-6400/XT System

Wednesday, February 9th, 2011


Introduction Oxygen is a competitive substrate for ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco), resulting in an inhibitory effect on net photosynthesis.  Higher CO2 to O2 ratios inside the leaf decrease the Rubisco-catalyzed reactions with O2, resulting in less carbon-wasteful reactions in the light (photorespiration). Photorespiration increases on hot, dry days when evaporative stress can cause stomata to…


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Recovering from a bad zero or span; how to undo your doings.

Wednesday, February 2nd, 2011

The LI-7700 is an inherently stable laser-based analyzer that requires minimal user calibration during normal use. User calibrations can still be performed to validate instrument performance, and are required when changing the instrument from its warm to cold temperature operating range. The possibility does exist, however, to perform an incorrect user calibration, which will have…


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