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UV photo-degradation of the secondary lichen substance parietin: A multi-spectroscopic analysis in astrobiology perspective.
Life Sci Space Res (Amst)
May 2024
INAF-Astrophysical Observatory of Arcetri, Largo E. Fermi 5, 50125 Florence, Italy. Electronic address:
The cortical anthraquinone yellow-orange pigment parietin is a secondary lichen substance providing UV-shielding properties that is produced by several lichen species. In our work, the secondary metabolite has been extracted from air-dried thalli of Xanthoria parietina. The aims of this study were to characterize parietin absorbance through UV-VIS spectrophotometry and with IR spectroscopy and to evaluate its photodegradability under UV radiation through in situ reflectance IR spectroscopy to understand to what extent the substance may have a photoprotective role.
View Article and Find Full Text PDFMassive Galaxy Clusters Like El Gordo Hint at Primordial Quantum Diffusion.
Phys Rev Lett
March 2023
Laboratoire de Physique de l'École Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université Paris Cité, F-75005 Paris, France.
It is generally assumed within the standard cosmological model that initial density perturbations are Gaussian at all scales. However, primordial quantum diffusion unavoidably generates non-Gaussian, exponential tails in the distribution of inflationary perturbations. These exponential tails have direct consequences for the formation of collapsed structures in the Universe, as has been studied in the context of primordial black holes.
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