References of "Javaux, Emmanuelle"
     in
Bookmark and Share    
See detailEarly life evolution, habitats and biosignatures. Astrobiology and Habitability workshop
Javaux, Emmanuelle ULg; Marshall, Craig

Conference (2006, June)

Detailed reference viewed: 9 (0 ULg)
Peer Reviewed
See detailCriteria for biogenicity of morphological signatures
Javaux, Emmanuelle ULg

Conference (2006, April)

Detailed reference viewed: 2 (0 ULg)
Full Text
Peer Reviewed
See detailThe astrobiology primer: An outline of general knowledge - Version 1, 2006
Mix, Lucas J; Armstrong, John C; Mandell, Avi M et al

in Astrobiology (2006), 6(5), 735-813

Detailed reference viewed: 24 (2 ULg)
Full Text
Peer Reviewed
See detailA new approach in deciphering early protist paleobiology and evolution: Combined microscopy and microchemistry of single Proterozoic acritarchs
Javaux, Emmanuelle ULg; Marshal, C. P.

in Review of Palaeobotany and Palynology (2006), 139(1-4), 1-15

Beside a few cases, the biological affinities of Proterozoic and Paleozoic acritarchs remain, by definition, largely unknown. However, these fossils record crucial steps in the early evolution of ... [more ▼]

Beside a few cases, the biological affinities of Proterozoic and Paleozoic acritarchs remain, by definition, largely unknown. However, these fossils record crucial steps in the early evolution of microorganisms and diversification of complex ecosystems. We present how combining microscopy (light microscopy, scanning and transmitted electron microscopy) with microchemical analyses of individual microfossils may offer further insights into the paleobiology and evolution of early microorganisms. We use our ongoing work on early Mesoproterozoic and Neoproterozoic assemblages, as well as other published work, as examples to illustrate how this approach may clarify the evolution of early microorganisms and we underline how useful this approach could be for palynologists working on younger material. Such a multidisciplinary approach offers new possibilities to investigate the biological affinities of acritarchs and the record of early life on Earth and beyond. (c) 2006 Elsevier B.V. All rights reserved. [less ▲]

Detailed reference viewed: 24 (0 ULg)
Peer Reviewed
See detailBiological innovations and diversification of early eukaryotes
Javaux, Emmanuelle ULg

Conference (2006)

Detailed reference viewed: 3 (0 ULg)
See detailPatterns of early eukaryote diversification
Javaux, Emmanuelle ULg

Conference (2006)

Detailed reference viewed: 3 (0 ULg)
Peer Reviewed
See detailAn astrobiology QUIZZ: How to recognize extraterrestrial life?
Vandenabeele-Trambouze, O.; Alekina, I.; Benzerara, K. et al

Conference (2006)

Detailed reference viewed: 13 (0 ULg)
Peer Reviewed
See detailBiomarqueurs et Biosignatures: synthèse de l'Atelier de Dourdan 22-24 Mars 2006
Vandenabeele-Trambouze; Alekina, I.; Benzerara, K. et al

Poster (2006)

Detailed reference viewed: 3 (1 ULg)
See detailEvolution of early eukaryotes
Javaux, Emmanuelle ULg

Scientific conference (2006)

Detailed reference viewed: 2 (0 ULg)
See detailBiosignatures morphologiques: quelques pistes de réflexion
Javaux, Emmanuelle ULg

Conference (2006)

Detailed reference viewed: 7 (0 ULg)
Full Text
Peer Reviewed
See detailExtreme life on Earth - past, present and possibly beyond
Javaux, Emmanuelle ULg

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: 79 (1 ULg)
Full Text
See detailThe early eukaryote fossil record
Javaux, Emmanuelle ULg

in Jékely, Gáspár (Ed.) Evolution of the Eukaryotic Endomembrane System and Cytoskeleton (2006)

Detailed reference viewed: 9 (0 ULg)
See detailEléments de paléontologie
Javaux, Emmanuelle ULg

Learning material (2006)

powerpoint sur MyULg

Detailed reference viewed: 15 (2 ULg)
See detailA la recherche de la vie dans l’univers
Javaux, Emmanuelle ULg

Conference given outside the academic context (2006)

Detailed reference viewed: 8 (1 ULg)
See detaill'astrobiologie: origine, évolution et distribution de la vie dans l'univers
Javaux, Emmanuelle ULg

Conference given outside the academic context (2006)

Detailed reference viewed: 15 (1 ULg)
See detaill'astrobiologie: origine, évolution et distribution de la vie dans l'univers
Javaux, Emmanuelle ULg

Conference given outside the academic context (2006)

Detailed reference viewed: 8 (1 ULg)
Full Text
Peer Reviewed
See detailEukaryotic organisms in Proterozoic oceans
Knoll, A. H.; Javaux, Emmanuelle ULg; Hewitt, D. et al

in 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: 12 (1 ULg)
Full Text
Peer Reviewed
See detailVibrational spectroscopy of extant and fossil microbes: Relevance for the astrobiological exploration of Mars
Marshall, Craig P; Carter, Elizabeth A; Leuko, Stefan 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: 24 (0 ULg)