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Ultraviolet radiation screening compounds
These compounds, as well as providing us with insights into natural responses to UV radiation, may also have implications for the development of artificial UV‐screening methods to reduce human exposure toUV radiation.
The Chicxulub Asteroid Impact and Mass Extinction at the Cretaceous-Paleogene Boundary
Records of the global stratigraphy across this boundary are synthesized to assess the proposed causes of the Cretaceous-Paleogene boundary and conclude that the Chicxulub impact triggered the mass extinction.
Emergence of a Habitable Planet
Abstract We address the first several hundred million years of Earth’s history. The Moon-forming impact left Earth enveloped in a hot silicate atmosphere that cooled and condensed over ∼1,000 yrs. As
The ultraviolet environment of Mars: biological implications past, present, and future.
The present-day martian UV flux is similar to that of early Earth and thus may not be a critical limitation to life in the evolutionary context, it is a constraint to an unadapted biota and will rapidly kill spacecraft-borne microbes not covered by a martian dust layer.
The evolution of inorganic carbon concentrating mechanisms in photosynthesis
The earliest CCMs may have evolved in oxygenic cyanobacteria before the atmosphere became oxygenated in stromatolites with diffusion barriers around the cells related to UV screening, and increase the O2 concentration within them, inhibiting rubisco and generating reactive oxygen species, including O3.
Biological effects of high ultraviolet radiation on early earth--a theoretical evaluation.
  • C. Cockell
  • Environmental Science
    Journal of theoretical biology
  • 21 August 1998
The data suggest that many physical and biological methods may have been effective and would have allowed for the radiation of life even under the high UV radiation regimes of archean Earth, and that the UV regime on the surface of Mars is not a life limiting factor per se, although other environmental factors may contribute towards the apparent lack of a surface biota.