Titlebook: Strategies of Life Detection; Oliver Botta,Jeffrey L. Bada,Roger Summons Book 2008 Springer-Verlag US 2008 Accretion.astrobiology.biosigna

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An Approach to Searching for Life on Mars, Europa, and Enceladus,oteins, 5 nucleotide bases to construct DNA and RNA, and a few sugars to construct polysaccharides. This selectivity will result in a statistically anomalous distribution of organic molecules distinct from organic material of non-biological origin. Such a distinctive pattern, different from the patt

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,Accretion, Trapping and Binding of Sediment in Archean Stromatolites—Morphological Expression of thme-dependent, increasing complexity of stromatolitic structures in the Archean is an additional strong argument for biologic impact on stromatolite formation. Therefore, biogenic stromatolites and microbial mats were undoubtfully present at 3.5 Ga and occupied an increasingly wide range of sedimenta

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,Morphological Biosignatures in Early Terrestrial and Extraterrestrial Materials,roscopic stromatolites from the 3.443 Ga Strelley Pool Chert, Pilbara; a meso-microscopic microbial mat from the 3.333 Ga Josefsdal Chert, Barberton; microscopic microbial colonies and a biofilm from the 3.446 Ga Kitty’s Gap Chert, Pilbara; and microscopic microbial corrosion pits in the glassy rind

礼节

,Gene Transfer and the Reconstruction of Life’s Early History from Genomic Data,ined in molecular sequences, correlations with biochemical fossils and with the geological record need to be interpreted with caution. Advances to detect and pinpoint transfer events promise to untangle at least a few of the intertwined histories of individual genes within organisms and trace them t

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Fossil Lipids for Life-Detection: A Case Study from the Early Earth Record,iews the basis for the very existence of a molecular fossil record from lipid biochemistry to mechanisms of organic-matter preservation and geochemical alteration. A systematic approach to resolving the provenance of molecular fossils and historical qualities of the record is presented in a case stu

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Stable Isotope Ratios as a Biomarker on Mars,dies on Mars will encounter several important obstacles. In the case of carbon isotopes, the most important obstacle is the absence of a contemporary abiologic carbon reservoir (such as carbonate deposits on Earth) to act as isotopic standard. The presence of a contemporary abiologic sulfate reservo

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