Publications by authors named "Giovanni Strazzulla"

Article Synopsis
  • Ceres has notable amounts of aliphatic organics, with concentrations ranging from 5 to over 30 weight % in certain areas of its surface.
  • The origins and longevity of these organics are questioned, especially since radiation levels in Ceres' orbit should typically break them down, complicating their detection.
  • Laboratory experiments suggest that organic materials degrade quickly under radiation, indicating that buried organics may have been exposed in the recent past, and estimates show the initial abundance of aliphatics could be 2 to 30 times higher than what is currently observed.
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Laboratory experiments have shown that the energetic processing, i.e. ion bombardment and UV photolysis, of interstellar grain mantles and cometary surfaces is efficient in the production of formamide.

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The European AstRoMap project (supported by the European Commission Seventh Framework Programme) surveyed the state of the art of astrobiology in Europe and beyond and produced the first European roadmap for astrobiology research. In the context of this roadmap, astrobiology is understood as the study of the origin, evolution, and distribution of life in the context of cosmic evolution; this includes habitability in the Solar System and beyond. The AstRoMap Roadmap identifies five research topics, specifies several key scientific objectives for each topic, and suggests ways to achieve all the objectives.

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In this experimental study, cells of the radiation-resistant bacterium Deinococcus radiodurans were exposed to several different sources of radiation chosen to replicate the charged particles found in the solar wind. Naked cells or cells mixed with dust grains (basalt or sandstone) differing in elemental composition were exposed to electrons, protons, and ions to determine the probability of cell survival after irradiation. Doses necessary to reduce the viability of cell population to 10% (LD(10)) were determined under different experimental conditions.

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