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Driven by ground-based, airborne, and IRAS observations, the PAH hypothesis was first formulated in the mid-eighties : the widespreas emission features in the 3-13 æm range are due to UV-pumped, IR fluorescence by large Polycyclic Aromatic Hydrocarbon molecules. These molecules are a ubiquitous component of the interstellar medium both in local galaxies as well as out to redshifts of ̃3 and probably beyond, play an important role in its physical and chemical characteristics, and form a key link between small hydrocarbon species and large carbonaceous grains. This book gathers contributions that reflect the evolution of the field over the last 25 years, taking advantage of IR space missions - ISO, Spitzer and AKARI - and of dedicated experimental and quantum-chemical studies. We have now reached a stage where we can develop these mid-infrared features as diagnostic tools to study star formation processes, protoplanetary disks as well as galaxy assemblage in the early Universe. The current Herschel/Planck area opens the possibility to better characterize the mid-IR carriers through their contribution to the far-IR and mm emissions. Still, much effort is required before we will fully understand the formation and nature of interstellar PAHs and their role in the Universe. Physical chemists can play an important role in driving this field. This book aims at discussing the state-of-the-art of the PAH hypothesis and to chart the future in this interdisciplinary field. It highlights the various aspects of interstellar PAHs:- Rich IR spectra of interstellar PAHs- PAHs and star formation in the near and far Universe- The lifecycle of PAHs in space- PAHs in regions of planet formation- PAHs and carbonaceous grains & Solar system materials.

Stars --- Organic Chemistry, --- Infrared spectra --- Polycyclic aromatic hydrocarbons --- Congresses. --- PAH hypothesis --- space missions

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Studying the origin of life is one of man’s greatest achievements over the last sixty years. The fields of interest encompassed by this quest are multiple and interdisciplinary: chemistry, physics, biology, biochemistry, mathematics, geology but also statistics, atmospheric science, meteorology, oceanography, and astrophysics. Recent scientific discoveries, such as water on Mars and the existence of super-Earths with atmospheres similar to primordial Earth, have pushed researchers to simulate prebiotic conditions in explaining the abiotic formation of molecules essential to life. This collection of articles offers an overview of recent discoveries in the field of prebiotic chemistry of biomolecules, their formation and selection, and the evolution of complex chemical systems.

minerals --- n/a --- inosine --- carbamic acid --- prebiotic chemistry --- pentopyranose nucleic acid --- catalysis --- MVC architecture pattern and biological information --- carbon dioxide-ammonia ices --- stability as a selection pressure --- ribozyme and tRNA --- translation and the genetic code --- AnyLogic software for computer simulation of translation machine --- Darwinian evolution --- prebiotic information system --- genetic code origin --- electrochemistry --- coevolution of translation machine and the genetic code --- digit multiplicity --- thermodynamic bottleneck --- abasic oligomers --- selection --- nucleotide stability --- AICAR --- tRNA-synthetase --- hypercycle --- nucleotide oligomerization --- origin of life --- thioester --- dry-wet cycles --- Chemomimesis --- population growth --- tRNA and mRNA --- diversity --- early peptides --- Molecular Darwinism --- tRNA accretion model --- replication --- aldol reaction --- hydrothermal vents --- base pairing --- numerical codons --- abiogenesis --- purine precursor --- peptide/RNA world --- information --- ab initio molecular dynamics --- RNA --- cysteine --- nucleotide and nucleoside synthesis --- thiol-rich peptides --- novel metalloproteins --- transmission --- function --- energy currency --- anharmonicity --- arabinopyranose nucleic acid --- bridge peptide and aaRS --- aminonitriles --- mechanochemistry --- prebiotic polymerization --- origins of life --- encoding --- carbon fixation --- infrared spectra --- phosphoryl transfer --- metabolism --- growth order --- layered double hydroxide (LDH) clay --- molecular clocks --- Monte Carlo --- binary patterned amino acid sequences --- network expansion simulation --- prebiotic soup --- nucleotidyltransferases --- mixed anhydride --- phosphates --- translation --- ribosome --- pentose diphosphate --- monosaccharides --- systems chemistry --- reduction --- imidazoles --- protein design