Cookies help us deliver our services. By using our services, you agree to our use of cookies. More information

MiPNet10.05 O2-Concentration-Flux

From Bioblast
Publications in the MiPMap
Gnaiger E (2005-2010) From oxygen concentration to oxygen flux. Mitochondr Physiol Network 10.05. - New edition: Gnaiger 2012 Chapter 1.

» Bioblast pdf »Versions


Abstract: O2k-Protocol for Oxygen flux

In a closed oxygraph chamber, the oxygen concentration declines over time as a result of respiratory processes. The time derivative, therefore, is a negative number. Why is then the ‘rate of oxygen consumption’ not expressed as a negative value? Why is the term ‘oxygen flux’ used in this context of chemical reactions? The rationale is based on fundamental concepts of physical chemistry and non-equilibrium thermodynamics.

O2k-Protocols contents
MiPNet10.05.jpg

Respiratory oxygen flux: On-line display of oxygen concentration (blue) and oxygen flux (respiration, red). Endogenous respiration of endothelial cells leads to oxygen depletion, followed by reoxygenations (dotted arrows). Cell membrane permeabilization by digitonin causes a decline of respiration to the resting level (without adenylates in the medium, -ANP). ADP titration activates respiration about 2-fold above the endogenous level of oxygen consumption.

Eye-fitted slopes of oxygen chart recorder traces belong to the past. With DatLab, trends are resolved. Accuracy is improved by standard numerical corrections. Graphs and protocols are stored and printed ready for publication.


Reference

Gnaiger E (1993) Nonequilibrium thermodynamics of energy transformations. Pure Appl Chem 65: 1983-2002.


>> O2k-Protocols: Overall contents
>> Product: Oroboros O2k, O2k-Catalogue

Keywords: Archive

O2k-Network Lab: AT_Innsbruck_Oroboros


Labels:





HRR: O2k-Protocol 

Archive 

Further Information

>> Gnaiger 2012 MitoPathways References