Difference between revisions of "Oxygen flux"
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{{MitoPedia | {{MitoPedia | ||
|abbr=''J''<sub>O2</sub> | |abbr=''J''<sub>O2</sub> | ||
|description='''Oxygen flux''', ''J''<sub>O<sub>2</sub></sub>, is a [[specific quantity]]. Oxygen [[flux]] is [[oxygen flow]], ''I''<sub>O<sub>2</sub></sub> [mol·s<sup>-1</sup> per system] (an [[extensive quantity]]), divided by system size. Flux may be volume-specific (flow per volume [pmol·s<sup>-1</sup>·mL<sup>-1</sup>]), mass-specific (flow per mass [pmol·s<sup>-1</sup>·mg<sup>-1</sup>]), or marker-specific (flow per mtEU). Oxygen flux (''e.g.'', per body mass, or per cell mass) is distinguished from oxygen flow (per | |description='''Oxygen flux''', ''J''<sub>O<sub>2</sub></sub>, is a [[specific quantity]]. Oxygen [[flux]] is [[oxygen flow]], ''I''<sub>O<sub>2</sub></sub> [mol·s<sup>-1</sup> per system] (an [[extensive quantity]]), divided by system size. Flux may be volume-specific (flow per volume [pmol·s<sup>-1</sup>·mL<sup>-1</sup>]), mass-specific (flow per mass [pmol·s<sup>-1</sup>·mg<sup>-1</sup>]), or marker-specific (flow per mtEU). Oxygen flux (''e.g.'', per body mass, or per cell mass) is distinguished from oxygen flow (per object, or per cell). | ||
|info=[[Gnaiger 2019 MitoFit Preprint Arch]], [[Gnaiger 2020 MitoPathways]], [[Gnaiger 1993 Pure Appl Chem]], [[Renner 2003 Biochim Biophys Acta]] | |info=[[Gnaiger 2019 MitoFit Preprint Arch]], [[Gnaiger 2020 MitoPathways]], [[Gnaiger 1993 Pure Appl Chem]], [[Renner 2003 Biochim Biophys Acta]] | ||
}} | }} | ||
== Which SI units should be used? == | == Which SI units should be used? == | ||
:::* '''Convert various units of volume-specific or mass-specific oxygen flux''', ''J''<sub>O<sub>2</sub></sub>, to '''SI units''' [nmol·s<sup>-1</sup>·L<sup>-1</sup>] = [pmol·s<sup>-1</sup>·mL<sup>-1</sup>] | |||
:::::: 1 µmol O<sub>2</sub>∙min<sup>-1</sup> ∙ 16.67 | :::::: 1 µmol O<sub>2</sub>∙min<sup>-1</sup>∙L<sup>-1</sup> ∙ [1000 nmol∙(1 µmol)<sup>-1</sup>] ∙ [1 min∙(60 s)<sup>-1</sup>] = 16.67 nmol O<sub>2</sub>∙s<sup>-1</sup>∙L<sup>-1</sup> | ||
:::::: 1 nmol O<sub>2</sub>∙min<sup>-1</sup> ∙ 16.67 | :::::: 1 nmol O<sub>2</sub>∙min<sup>-1</sup>∙L<sup>-1</sup> ∙ [1000 pmol∙(1 nmol)<sup>-1</sup>] ∙ [1 min∙(60 s)<sup>-1</sup>] = 16.67 pmol O<sub>2</sub>∙s<sup>-1</sup>∙L<sup>-1</sup> | ||
:::::: 1 nmol O<sub>2</sub>∙h<sup>-1</sup> ∙ 0.2778 | :::::: 1 nmol O<sub>2</sub>∙h<sup>-1</sup>∙L<sup>-1</sup> ∙ [1000 pmol∙(1 nmol)<sup>-1</sup>] ∙ [1 min∙(60 s)<sup>-1</sup>] ∙ [1 h∙(60 min)<sup>-1</sup>] = 0.2778 pmol O<sub>2</sub>∙s<sup>-1</sup>∙L<sup>-1</sup> | ||
:::::: 1 natom O∙s<sup>-1</sup> ∙ 0.5 | :::::: 1 natom O∙s<sup>-1</sup>∙L<sup>-1</sup> ∙ [1 nmol O<sub>2</sub>∙(2 natm O)<sup>-1</sup>] = 0.5 nmol O<sub>2</sub>∙s<sup>-1</sup>∙L<sup>-1</sup> | ||
:::::: 1 natom O∙min<sup>-1</sup> ∙ 8.33 | :::::: 1 natom O∙min<sup>-1</sup>∙L<sup>-1</sup> ∙ [1000 pmol O<sub>2</sub>∙(2 natom O)<sup>-1</sup>] ∙ [1 min∙(60 s)<sup>-1</sup>] = 8.33 pmol O<sub>2</sub>∙s<sup>-1</sup>∙L<sup>-1</sup> | ||
:::::: 1 mL O<sub>2</sub>∙min<sup>-1</sup> (at [[STPD]]) ∙ 0.744 | :::::: 1 mL O<sub>2</sub>∙min<sup>-1</sup>∙kg<sup>-1</sup> (at [[STPD]]) ∙ [1000 µmol∙(22.392 mL)<sup>-1</sup>] ∙ [1 min∙(60 s)<sup>-1</sup>] = 0.744 µmol O<sub>2</sub>∙s<sup>-1</sup>∙kg<sup>-1</sup> | ||
:::* There is a difference between '''oxygen flux per volume''' and '''oxygen concentration change per time''' | |||
:::::: The oxygen concentration change per time (= rate of concentration change) is expressed in units [µmol O<sub>2</sub>∙L<sup>-1</sup>∙s<sup>-1</sup>]. | :::::: The oxygen concentration change per time (= rate of concentration change) is expressed in units [µmol O<sub>2</sub>∙L<sup>-1</sup>∙s<sup>-1</sup>]. |
Revision as of 04:51, 15 January 2020
Description
Oxygen flux, JO2, is a specific quantity. Oxygen flux is oxygen flow, IO2 [mol·s-1 per system] (an extensive quantity), divided by system size. Flux may be volume-specific (flow per volume [pmol·s-1·mL-1]), mass-specific (flow per mass [pmol·s-1·mg-1]), or marker-specific (flow per mtEU). Oxygen flux (e.g., per body mass, or per cell mass) is distinguished from oxygen flow (per object, 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 various units of volume-specific or mass-specific oxygen flux, JO2, to SI units [nmol·s-1·L-1] = [pmol·s-1·mL-1]
- 1 µmol O2∙min-1∙L-1 ∙ [1000 nmol∙(1 µmol)-1] ∙ [1 min∙(60 s)-1] = 16.67 nmol O2∙s-1∙L-1
- 1 nmol O2∙min-1∙L-1 ∙ [1000 pmol∙(1 nmol)-1] ∙ [1 min∙(60 s)-1] = 16.67 pmol O2∙s-1∙L-1
- 1 nmol O2∙h-1∙L-1 ∙ [1000 pmol∙(1 nmol)-1] ∙ [1 min∙(60 s)-1] ∙ [1 h∙(60 min)-1] = 0.2778 pmol O2∙s-1∙L-1
- 1 natom O∙s-1∙L-1 ∙ [1 nmol O2∙(2 natm O)-1] = 0.5 nmol O2∙s-1∙L-1
- 1 natom O∙min-1∙L-1 ∙ [1000 pmol O2∙(2 natom O)-1] ∙ [1 min∙(60 s)-1] = 8.33 pmol O2∙s-1∙L-1
- 1 mL O2∙min-1∙kg-1 (at STPD) ∙ [1000 µmol∙(22.392 mL)-1] ∙ [1 min∙(60 s)-1] = 0.744 µmol O2∙s-1∙kg-1
- There is a difference between oxygen flux per volume and oxygen concentration change per time
- The oxygen concentration change per time (= rate of concentration change) is expressed in units [µmol O2∙L-1∙s-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 [µmol O2∙L-1∙s-1].
- Oxygen flux per volume (= volume-specific oxygen flux) is expressed in units [µmol O2∙s-1∙L-1] or [nmol O2∙s-1∙L-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 [µmol O2∙s-1∙L-1] or [nmol O2∙s-1∙L-1]
- Oxygen flux per mass (= mass-specific oxygen flux) is expressed in units [µmol O2∙s-1∙kg-1] = [pmol O2∙s-1∙mg-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 [µmol O2∙s-1∙kg-1] = [pmol O2∙s-1∙mg-1]
MitoPedia concepts: MiP concept, Ergodynamics
MitoPedia methods:
Respirometry