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Greenhouse warming by CH4 in the atmosphere of early Earth.
It is found that a CH4 mixing ratio of 10(-4) (100 ppmv) or more in Earth's early atmosphere would provide agreement with the paleosol data from 2.3-2.4 Ga, which could have triggered the Earth's first widespread glaciation. Expand
UV shielding of NH3 and O2 by organic hazes in the Archean atmosphere
The late Archean atmosphere was probably rich in biologically generated CH4 and may well have contained a hydrocarbon haze layer similar to that observed today on Saturn's moon, Titan. Here weExpand
Nitrogen‐Isotope Effects in the Reduction of Nitrate, Nitrite, and Hydroxylamine to Ammonia. I. In Sodium Hydroxide Solution with Fe (II)
Studies were made of the nitrogen‐isotope effects occurring during the alkaline reduction of NO3−, NO2−, and NH2OH with Fe(II). The pertinent reduction reactions were shown to be irreversible and theExpand
Some unusual oxidation products of 2,6-Di-tert-butyl-4-methylphenol
The potassium permanganate oxidation of 2,6-di-tert-butyl-4-methylphenol(1), adsorbed on a stationary Celite phase, gives several interesting monomeric products in low yields. These products wereExpand
Nitrogen Isotope Effects in the Reduction of Nitrate, Nitrite, and Hydroxylamine to Ammonia. II. The MgO and CuSO4 Systems
Nitrogen kinetic isotope effects were used to study reaction mechanisms associated with reductions of NO3−, NO2−, and NH2OH in hot alkaline solutions that contained Fe(II). In the CuSO4 system theExpand
The single‐stage nitrogen isotopic separation factor between nitric acid and the oxides of nitrogen has been measured as a function of temperature and nitric acid concentration. Nitric acidExpand
A carbon dioxide/methane greenhouse atmosphere on early Mars
One explanation for the formation of fluvial surface features on early Mars is that the global average surface temperature was maintained at or above the freezing point of water by the greenhouseExpand
Instability of orthophthalaldehyde reagent for amino acid analysis.
It is concluded that reagent deterioration represents oxidation of the thiol, may be reversed by rereduction with minimal thiol or bisulfite, and may be minimized by inclusion of a metal chelator in the reagent. Expand