Software for Fitting Photosynthetic CO2 or Light Response Curves

Software for Fitting Photosynthetic CO2 or Light Response Curves

A frequent question from LI-COR LI-6400XT users is a request for software resources for fitting the Farquhar, von Caemmerer and Berry (FvCB) model of photosynthesis (Farquhar, von Caemmerer & Berry 1980).  There is a wealth of literature on this topic and a variety of methods developed to fit the model.  There are currently no commercial software packages available for this purpose. Several software packages are, however, freely available for fitting the FvCB model of photosynthesis. Some approaches use only gas…

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New Publications Featuring the LI-6800

New Publications Featuring the LI-6800

A paper featuring the LI-6800 Portable Photosynthesis System was recently published in Plant and Cell Physiology. This publication explores how the color of actinic light affects the estimate of the electron transport rate (ETR) when calculated from fluorescence measurements.

View the abstract for Light Quality Affects Chloroplast Electron Transport Rates Estimated from Chl Fluorescence Measurements.

By changing the proportion of red and blue in the actinic light, the authors observed a difference between true ETR (J) and ETR…

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Solar Eclipse Data from LI-COR

Solar Eclipse Data from LI-COR

On Monday, the LI-COR campus was in the path of totality for the August 21, 2017 solar eclipse. Here are data collected during the eclipse at our campus in Lincoln, Nebraska, USA. Even though cloud cover obscured our direct view of the eclipse, there were observable differences in light intensity, photosynthesis measurements, and environmental flux during totality.

The partial eclipse began around 11:37 AM CST, with totality happening from 1:02 PM to 1:04 PM. The eclipse was over by 2:37…

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Fertile Soil for Teaching

Fertile Soil for Teaching

It’s not every researcher that wears a hard hat and works around dynamite. But Dr. Holly Dolliver of the University of Wisconsin—River Falls embraces the unique parts of studying soil at a frac sand mining site. Wisconsin law requires that land used for mining must be reclaimed, so Dr. Dolliver is part of a five-year research program to see how soils react to being stripped, stockpiled, and respread. “Our emphasis is to understand holistically how the soil responds to disturbance,…

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Eddy Covariance Port Forwarding and Blocking

Eddy Covariance Port Forwarding and Blocking

Why does remote connectivity through a cell modem to a LI-COR eddy covariance system work from certain Internet connections and not from others?

LI-COR eddy covariance systems can have several devices which use the TCP/IP protocol, and they can all be connected to a modem which has access to the Internet. A port forwarding rule is set up in the modem, so that communications arriving through certain ports are forwarded to specific instruments. For example, the LI-7200RS CO2/H2O analyzer communicates…

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