There is some indication that potash levels declined before the application of potassium sulphate in 2002, but trends are not significant.
The reference was a barium sulphate standard plate.
Readings were standardized for 100% reflectance with barium sulphate.
These results are analogous to the deviations shown by fractionation due to bacterial sulphate reduction.
For nitrate and phosphate, data represent means of 30 replicates; for chloride, means of three replicates; for sulphate, a single replicate.
The samples were examined by simple smear and zinc sulphate concentration methods.
Robust sulphate reduction, substrate utilization, and target biomass production is currently being observed and reported.
Evidence for photosynthetic activity within sulphate crystals is therefore interesting as a habitat that could be widespread on other planets.
