Another problem: Experts have not found the charred, carbon-rich traces of impact-triggered wildfires across North America reported by proponents in the 2007 PNAS paper.
The final blow, in the eyes of some, comes this week in a paper reporting a failure to find proponents' most promising trace of an impact, a particular crystal form of nano-size diamond.
Although not specifically designed for monitoring very fast dynamic events, HASI accelerometers have also recorded the trace of probe impact with the planetary surface, building up along with the data from Huygens Surface Science Package (SSP) instrument [Zarnecki, J.C., Leese, M.R., Garry, J.R.C., Ghafoor, N.A.L., Hathi, B., 2002. Huygens Surface Science Package. Space Sci.
In such circumstances, as Ruth Brandon said in her life of the equally undocumented Isaac (sewing machine) Singer, "The biographer is in a position similar to the physicist who must draw evidence for the existence of certain particles, from the traces of their impact upon other particles".
No direct traces of tsunami impact below an 18-m water depth were found in hydroacoustic data or sediment samples.
The focus of this model is to reconstruct a historical epidemic that left traces of its impact in the form of an ILI epidemic curve.
Definitions of baseline are given here which can form the basis for distinguishing pristine from polluted waters as well as criteria for identifying modern waters with only traces of human impact from more polluted waters.
Far from such a detailed account, in our tracing of the impact of applied mathematics and computing developments in chemical engineering research through the last 50 years we find two main trends, at very different professional levels.
GWAS have already enabled tracing of the impact of human ancestry on n-3 polyunsaturated fatty acid (PUFA) levels.
For example, a baker could trace the impact of a loaf of bread by tracing the environmental cost of the raw ingredients and their costs of transportation.
Back to Black attempts, and largely succeeds, to amass the icons of black identity and trace the impact of the black arts movement on mass culture.
