The scientists employed NASA flight-tested* pyrolysis gas-chromatography mass-spectrometry (GCMS) methods to analyse 134 varied carbon-rich samples from living cells, age-degraded samples ...

David E. Brown, Charles H. Lowe, Charles P. Pase, A Digitized Classification System for the Biotic Communities of North America, with Community (Series) and Association Examples for the Southwest, ...

This biotic association shows a temporal change in paleoenvironmental preference through the Phanerozoic from generally inner- to mid-shelf Cambrian and Ordovician examples to both mid-shelf and ...