Showing results 121 to 140 of 184
 Patterns of early eukaryote diversificationJavaux, Emmanuelle  Conference (2006) Detailed reference viewed: 3 (0 ULg)Astrobiologie : origine, évolution et distribution de la vie dans l’universJavaux, Emmanuelle Conference (2006) Detailed reference viewed: 2 (0 ULg)An astrobiology QUIZZ: How to recognize extraterrestrial life?; ; et al Conference (2006) Detailed reference viewed: 13 (0 ULg)Biomarqueurs et Biosignatures: synthèse de l'Atelier de Dourdan 22-24 Mars 2006; ; et al Poster (2006) Detailed reference viewed: 3 (1 ULg)Evolution of early eukaryotesJavaux, Emmanuelle Scientific conference (2006) Detailed reference viewed: 2 (0 ULg)Biosignatures morphologiques: quelques pistes de réflexionJavaux, Emmanuelle Conference (2006) Detailed reference viewed: 6 (0 ULg) Extreme life on Earth - past, present and possibly beyondJavaux, Emmanuelle in Research in Microbiology (2006), 157(1), 37-48 Life may have been present on Earth since about 3.8 billion years ago or earlier. Multidisciplinary research, especially on the paleobiology and evolution of early microorganisms on Earth and the ... [more ▼] Life may have been present on Earth since about 3.8 billion years ago or earlier. Multidisciplinary research, especially on the paleobiology and evolution of early microorganisms on Earth and the microbiology of extremophiles in the Earth's environments and under space conditions, enables the defining of strategies for the detection of potential extraterrestrial life by determining biosignatures and the environmental envelope of life. (C) 2005 Elsevier SAS. All rights reserved. [less ▲] Detailed reference viewed: 75 (0 ULg)The early eukaryote fossil recordJavaux, Emmanuelle in Jékely, Gáspár (Ed.) Evolution of the Eukaryotic Endomembrane System and Cytoskeleton (2006) Detailed reference viewed: 6 (0 ULg)Eléments de paléontologieJavaux, Emmanuelle Learning material (2006) powerpoint sur MyULg Detailed reference viewed: 14 (1 ULg)A la recherche de la vie dans l’universJavaux, Emmanuelle Conference given outside the academic context (2006) Detailed reference viewed: 7 (1 ULg)l'astrobiologie: origine, évolution et distribution de la vie dans l'universJavaux, Emmanuelle Conference given outside the academic context (2006) Detailed reference viewed: 12 (1 ULg)l'astrobiologie: origine, évolution et distribution de la vie dans l'universJavaux, Emmanuelle Conference given outside the academic context (2006) Detailed reference viewed: 6 (1 ULg)Eukaryotic organisms in Proterozoic oceans; Javaux, Emmanuelle ; et alin Philosophical Transactions : Biological Sciences (2006), 361(1470), 1023-1038 The geological record of protists begins well before the Ediacaran and Cambrian diversification of animals, but the antiquity of that history, its reliability as a chronicle of evolution and the causal ... [more ▼] The geological record of protists begins well before the Ediacaran and Cambrian diversification of animals, but the antiquity of that history, its reliability as a chronicle of evolution and the causal inferences that can be drawn from it remain subjects of debate. Well-preserved protists are known from a relatively small number of Proterozoic formations, but taphonomic considerations suggest that they capture at least broad aspects of early eukaryotic evolution. A modest diversity of problematic, possibly stem group protists occurs in ca 1800-1300 Myr old rocks. 1300-720 Myr fossils document the divergence of major eukaryotic clades, but only with the Ediacaran-Cambrian radiation of animals did diversity increase within most clades with fossilizable members. While taxonomic placement of many Proterozoic eukaryotes may be arguable, the presence of characters used for that placement is not. Focus on character evolution permits inferences about the innovations in cell biology and development that underpin the taxonomic and morphological diversification of eukaryotic organisms. [less ▲] Detailed reference viewed: 8 (1 ULg)Vibrational spectroscopy of extant and fossil microbes: Relevance for the astrobiological exploration of Mars; ; et al in Vibrational Spectroscopy (2006), 41(2), 182-189 The vibrational spectra of an extant Archaea, Halobacterium salinarum, an extant micro-eukaryote resistant biopolymer isolated from Botrycoccus braunii, and an extinct (ca. 590-565 Ma) micro-eukaryote ... [more ▼] The vibrational spectra of an extant Archaea, Halobacterium salinarum, an extant micro-eukaryote resistant biopolymer isolated from Botrycoccus braunii, and an extinct (ca. 590-565 Ma) micro-eukaryote microfossil Tanarium conoideum, have been recorded using near-infrared FT Raman spectroscopy and FTIR spectroscopy. Raman biosignatures for the carotenoid pigment, bacterioruberin was obtained from the halophilic Archaea H. salinarum. Another pigment biosynthesized by halophilic Archaea, bacteriorhodopsin a retinal-protein complex was also investigated. The FTIR analysis of H. salinarum showed the presence of proteins and lipids, and the spectrum of isolated bacteriorhodopsin was different in that it contained retinal C-C stretching bands. FT Raman and FTIR analysis of the resistant biopolymer isolated from B. braunii indicated a composition of long straight chain polymethylenic macromolecule-termed algaenan. Moreover, these biopolymers can be preserved on geological timescales, hence the importance of generating a database of these materials for palaeobiology and astrobiology applications. The FT Raman and FTIR spectra acquired from T. conoideum contain intense aliphatic C-H stretching modes in the 2700-3000 cm(-1) region. Both the FT Raman and FTIR spectra are consistent with vibrational spectra obtained from algaenans isolated from extant chlorophytes, for example, B. braunii, or eustigmatophyte micro-algae. (C) 2006 Elsevier B.V. All rights reserved. [less ▲] Detailed reference viewed: 18 (0 ULg)report from JENAM "Astrobiology and exploration of the solar system" sessionJavaux, Emmanuelle Report (2005) Detailed reference viewed: 4 (0 ULg)Exobiologie et complexitéJavaux, Emmanuelle ; Nazé, Yaël Article for general public (2005) Detailed reference viewed: 17 (5 ULg)Astrobiologie et exploration du système solaireJavaux, Emmanuelle ; ; et alConference given outside the academic context (2005) Detailed reference viewed: 4 (2 ULg)Astrobiology in Belgium. Extension workshop of the Joined European and National Astronomy Meeting (JENAM) in Liège, 4-8th July 2005.Javaux, Emmanuelle ; Swings, Jean-Pierre ; Surdej, Jean Book (2005) Astrobiology in Belgium. Extension workshop of the Joined European and National Astronomy Meeting (JENAM) in Liège, 4-8th July 2005. Detailed reference viewed: 9 (1 ULg) Pre-Cambrian to Palaeozoic Palaeopalynology and PalaeobotanySteemans, Philippe ; Javaux, Emmanuelle in Carnets de Géologie = Notebooks on Geology (2005), Mémoir 2005/02 Detailed reference viewed: 23 (2 ULg)FT-Raman Spectroscopy of Extant and Fossil Micro-Algae; Javaux, Emmanuelle Conference (2005) Detailed reference viewed: 7 (0 ULg) |
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