Orton (1874) noted that "the brown color for which it [the Buena Vista] is so justly admired is not a natural, but a derivative color, formed from the conversion of a notable quantity of
protoxide of iron [Fe[O.sub.2] into sesquioxide [[Fe.sub.2][O.sub.3]]."
Calcium was measured by atomic absorption spectrophotometry (AAS) (SOLAAR AA spectrometer M series, Thermo Electron Corporation) with acetylene/nitrogen
protoxide flame and detection limit of 0.01 mg/l.
Amaducci, "A novel static automatic sampler for soil flux measurements of carbon dioxide and nitrogen
protoxide," in La Chimica Agraria Tra Energia e Ambiente, Proceedings of the 30th Congress of the Italian Society of Agricultural Chemistry, 2012.
Mice were anesthetized using a gaseous anaesthesia system (Biological Instruments, Italy), based on isolurane mixed to oxygen and nitrogen
protoxide. Anaesthesia was first induced in a preanaesthesia chamber (2% isolurane), and then the mouse was placed on the heated imaging bed of the Optix under 1% isolurane.