From Bioblast
Description
Oxygen flux, JO2, is a specific quantity. Oxygen flux is oxygen flow, IO2 [molยทs-1 per system] (an extensive quantity), divided by system size. Flux may be volume-specific (flow per volume [pmolยทs-1ยทmL-1]), mass-specific (flow per mass [pmolยทs-1ยทmg-1]), or marker-specific (flow per mtEU). Oxygen flux (e.g., per body mass, or per cell mass) is distinguished from oxygen flow (per subject, or per cell).
Abbreviation: JO2
Reference: Gnaiger 2019 MitoFit Preprint Arch, Gnaiger 2020 MitoPathways, Gnaiger 1993 Pure Appl Chem, Renner 2003 Biochim Biophys Acta
Which SI units should be used?
- Convert volume-specific oxygen flux, JO2, to units [nmolยทs-1ยทL-1] = [pmolยทs-1ยทmL-1]
- 1 ยตmol O2โmin-1 โ 16.67 = 1 nmol O2โs-1
- 1 nmol O2โmin-1 โ 16.67 = 1 pmol O2โs-1
- 1 nmol O2โh-1 โ 0.2778 = 1 pmol O2โs-1
- 1 natom Oโs-1 โ 0.5 = 1 nmol O2โs-1
- 1 natom Oโmin-1 โ 8.33 = 1 pmol O2โs-1
- 1 mL O2โmin-1 (at STPD) = 1 ยตmol O2โs-1
- The difference of oxygen flux per volume and oxygen concentration change per time
- The oxygen concentration change per time (= rate of concentration change) is expressed in units [ยตmol O2โL-1โs-1].
- By definition the rate of concentration change is zero in an open system at steady-state, when the concentration in the system does not change at any respiratory flux by the sample enclosed in the open system.
- The oxygen concentration change per time (= rate of concentration change) is expressed in units [ยตmol O2โL-1โs-1].
- Oxygen flux per volume (= volume-specific oxygen flux) is expressed in units [ยตmol O2โs-1โL-1] or [nmol O2โs-1โL-1]
- By definition the volume-specific oxygen flux is the advancement of reaction per volume of the reaction chamber.
- Oxygen flux per volume (= volume-specific oxygen flux) is expressed in units [ยตmol O2โs-1โL-1] or [nmol O2โs-1โL-1]
- Oxygen flux per mass (= mass-specific oxygen flux) is expressed in units [ยตmol O2โs-1โkg-1] = [pmol O2โs-1โmg-1]
- By definition the mass-specific oxygen flux is the advancement of reaction per mass of the sample enclosed in the reaction chamber.
- Oxygen flux per mass (= mass-specific oxygen flux) is expressed in units [ยตmol O2โs-1โkg-1] = [pmol O2โs-1โmg-1]
MitoPedia concepts: MiP concept, Ergodynamics
MitoPedia methods:
Respirometry