• Publications
  • Influence
Rethinking early Earth phosphorus geochemistry
  • M. Pasek
  • Chemistry, Medicine
  • Proceedings of the National Academy of Sciences
  • 22 January 2008
TLDR
This alternate view of early Earth phosphorus geochemistry provides an unexplored route to the formation of pertinent prebiotic phosphorus compounds, suggests a facile reaction pathway to condensed phosphates, and is consistent with the biochemical usage of reduced oxidation state phosphorus compounds in life today. Expand
Sulfur chemistry with time-varying oxygen abundance during Solar System formation
Chemical models of solar nebula chemistry are presented which show the influence of progressive water depletion from the inner solar nebula. The main focus of this work is the equilibriumExpand
Extraterrestrial Flux of Potentially Prebiotic C, N, and P to the Early Earth
  • M. Pasek, D. Lauretta
  • Chemistry, Medicine
  • Origins of Life and Evolution of Biospheres
  • 1 February 2008
TLDR
This work quantifies the sources of potentially prebiotic, extraterrestrial C, N, and P and correlates these fluxes with a comparison to total Ir fluxes, and estimates the effect of atmosphere on the survival of material. Expand
Evidence for reactive reduced phosphorus species in the early Archean ocean
TLDR
The occurrence of phosphite in early Archean marine carbonates at levels indicating that this was an abundant dissolved species in the ocean before 3.5 Ga is reported, showing that phosphite derived from schreibersite was a plausible reagent in the prebiotic synthesis of phosphorylated biomolecules. Expand
Aqueous corrosion of phosphide minerals from iron meteorites: a highly reactive source of prebiotic phosphorus on the surface of the early Earth.
TLDR
The results strongly suggest that iron meteorites were an important source of reactive phosphorus (P), a requirement for the formation of P-based life, and demonstrate that iron meteors were an abundant source of phosphide minerals early in Earth history. Expand
Redox chemistry in the phosphorus biogeochemical cycle
TLDR
It is shown that between 10% and 20% of dissolved P bears a redox state of less than +5 in water samples from central Florida, on average, with some samples bearing almost as much reduced P as phosphate. Expand
Schreibersite on the early Earth: Scenarios for prebiotic phosphorylation
The mineral schreibersite, (Fe,Ni)3P, provides a reactive source of phosphorus capable of forming phosphorylated molecules. These molecules may have been an important component of prebioticExpand
Nucleoside phosphorylation by the mineral schreibersite
TLDR
A potential role for meteoritic phosphorus in the origin and development of early life is suggested by the simple mixing and mild heating of aqueous solutions of the organic compounds with synthetic analogs of the meteoritic mineral schreibersite. Expand
Phosphorylation on the early earth
Abstract Phosphorus is an element critical to the formation of several biomolecules, including nucleic acids, the energy transfer molecule ATP, and phospholipids. It hence lies at the heart ofExpand
Acidification of Europa's subsurface ocean as a consequence of oxidant delivery.
TLDR
If this process has been active on Europa for much of its age, then not only would it rob the ocean of life-supporting oxidants but the subsurface ocean could have a pH of ~2.6, which is so acidic as to present an environmental challenge for life, unless organisms consume or sequester the oxidants fast enough to ameliorate the acidification. Expand
...
1
2
3
4
5
...