Life Detection Workshop - Feb. 15-17, 2012, San Diego, CA1 Life Detection Workshop Scripps Institution of Oceanography February 15-17, 2012 An Example.

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Presentation transcript:

Life Detection Workshop - Feb , 2012, San Diego, CA1 Life Detection Workshop Scripps Institution of Oceanography February 15-17, 2012 An Example Test Protocol to Detect Life in Samples C. Conley & previous developers of the 2002 Draft Test Protocol

Back Contamination: A Candidate Mars Sample Handling Scenario Facilities: Mobile Retrieval Units (MRU) Sample Receiving Facility (SRF) Mars Curation Facility (MCF) External Analysis Receiving/Curation (MCF) Retrieval (MRU) Rapid retrieval and containment Subsampling Documentation Sample distribution Long-term curation Cold curation Preliminary examination/ characterization Subsampling, documentation Preliminary search for extinct/ extant life Hazard testing EEVs Samples Certified Safe? External Analysis

Sample-Return Protocol Overview All of these processes and measurements are relevant to both ‘science’ and ‘planetary protection’ – the major difference is what each does with the information. (There are a small number of activities specific for detecting biohazards that may need to be done, but this is beyond the scope here.)

P ROPERTIES OF L IVING S YSTEMS (J. Farmer) Order - The structures and subsystems of living systems are highly ordered. Replication (reproduction) - Organisms replicate themselves through various methods of asexual, or sexual reproduction. Growth and development – In higher organisms there is a pattern of development controlled by regulatory genes. Energy utilization - Life utilizes a broad array of processes to extract energy from its environment. Response to the environment - Organisms interact with and respond to their environment. Evolutionary adaptation - Life adapts to environmental changes over time through mechanisms of Darwinian evolution. Necessary versus sufficient…all are necessary, but none sufficient.

Life Detection Workshop - Feb , 2012, San Diego, CA5 What is Life Detection? Assumptions: looking for life based on carbon chemistry that happens at Mars-surface temperature and pressure, on human-detectable timescales (i.e., water soluble). Information addressing the properties of life as defined above might be found by measuring: 1) Structure and morphology of samples, at macro and micro scales 2) Chemical composition and heterogeneity of samples 3) Environmental and thermodynamic context of samples and interesting features within Two competing hypothesis should be tested: 1) There is no life in the samples. 2) There is Mars life in the samples. DATA will be collected: interpretation could provide 'strong biosignatures,' 'possible biosignatures,' 'indicators of abiotic processes,' or 'indicators of Earth contamination' – depending on which hypotheses the data support or refute.

Life Detection Workshop - Feb , 2012, San Diego, CA6 Initial Characterization Computed Tomography Elemental Imaging Mineralogical Analysis Stolen from UT Austin...

Life Detection Workshop - Feb , 2012, San Diego, CA7 Subsample Processing Past Future?

Life Detection Workshop - Feb , 2012, San Diego, CA8 Targeted Characterization Prepared Surface Imaging Micro-scale Probes Particle Analysis

Life Detection Workshop - Feb , 2012, San Diego, CA10 Criteria for Release? There are only a few grams in total!

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