Nitric oxide or NO (naturally found in the body) is
a highly reactive gas molecule, that has a role of transporting information between cells (neurotransmitter).
Seen from space humans, trees, elephants, or even whales are undetectable and unremarkable, yet Earth would reveal its secret to an outside observer through the surprising abundance of
a highly reactive gas, molecular oxygen.
In the parlance of astrobiologists,
the highly reactive gas is a potent «biosignature,» because in large concentrations it tends to be «out of equilibrium» with its surroundings.
For example, early global chemical modelling results argued that global tropospheric ozone, a greenhouse gas, was controlled by emissions of
the highly reactive gases nitrogen oxides (NOx), carbon monoxide (CO) and non-methane hydrocarbons (NMHC, also known as volatile organic compounds, VOC).
Not exact matches
«Without a membrane, the photoanode and photocathode are close enough to each other to conduct electricity, and if you also have bubbles of
highly reactive hydrogen and oxygen
gases being produced in the same place at the same time, that is a recipe for disaster,» Lewis says.
«Without a membrane, the photoanode and photocathode are close enough to each other to conduct electricity, and if you also have bubbles of
highly reactive hydrogen and oxygen
gases being produced in the same place at the same time, that is a recipe for disaster,» Lewis says regarding his findings published in PNAS.
The hydrogen was lost to space leaving
highly reactive oxygen to combust reduced carbon (C and CH4) and sulphur (inc sulphide) to acid
gases as well as oxidise near surface elemental or ferrous iron to ferric (red) iron.