Solar radiation dissociates water vapor into hydrogen atoms and hydroxyl radicles Hydrogen and hydrogen peroxide molecules, and perhydroxyl radicles, are also produced as a result of subsequent chemical reactions with the allotropic forms of oxygen The rate of the oxidizing processes falls off more rapidly with increase of altitude than does that of the reducing processes, and the hydrogen compounds are almost completely broken down at about the 90-km level (or even lower) There is a continual escape of the hydrogen atoms into interplanetary space; but the liberated oxygen atoms remain in the atmosphere, and the number that must thus have been added in geological time seems to be comparable with the number now present Consideration of the general equilibrium reveals several features of interest, such as, for example, the existence of a thin layer of molecular hydrogen In spite of the prominence of the Meinel bands, the concentration of hydroxyl radicles is quite small It is thought that these radicles are excited during, rather than after, their formation The mechanism proposed is two body collisions between hydrogen atoms and ozone molecules

The photochemistry of atmospheric water vapor

. We present the MPI-Mainz UV/VIS Spectral Atlas of Gaseous Molecules, which is a large collection of absorption cross sections and quantum yields in the ultraviolet and visible (UV/VIS) wavelength region for gaseous molecules and radicals primarily of atmospheric interest. The data files contain results of individual measurements, covering research of almost a whole century. To compare and visualize the data sets, multicoloured graphical representations have been created. The MPI-Mainz UV/VIS Spectral Atlas is available on the Internet at http://www.uv-vis-spectral-atlas-mainz.org . It now appears with improved browse and search options, based on new database software. In addition to the Web pages, which are continuously updated, a frozen version of the data is available under the doi:10.5281/zenodo.6951 .

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The MPI-Mainz UV/VIS Spectral Atlas of Gaseous Molecules of Atmospheric Interest

Oxidative stress associated with exercise, psychological stress and life-style factors

1. The genetic information system 2. James Watson, Francis Crick, George Gamow and the genetic code 3. The central dogma of molecular biology 4. The measure of information content in the genetic message 5. Communication of information from the genome to the proteome 6. The information content or complexity of protein families 7. Evolution of the genetic code and its modern characteristics 8. Haeckel's Urschleim and the role of the central dogma in the origin of life 9. Philosophical approaches to the origin of life 10. Error catastrophe and the hypercycles of Eigen and Schuster 11. Randomness, complexity, the unknowable and the impossible 12. Does evolution need an intelligent designer?

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L. H. Dawsey

Papers

The absorption spectrum and decomposition of hydrogen peroxide by light

The mechanism of homogeneous gas reactions. ii. the absorption spectrum of nitrogen pentoxide and its method of decomposition