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PAPERBACK price:$38.75 add to cart Rights & Permissions Free PDF Access Sign in to download PDF book and chapters Free Resources PDF SUMMARY PDF Report Brief Display this book on your site! Related Titles Biological Contamination of Mars:Issues and Recommendations Assessment of Mars Science and Mission Priorities Other Related Titles Preventing the Forward Contamination of Mars (2006) Space Studies Board (SSB) Citation Manager Export the bibliographic data for this book in your chosen format Web Search Builder Use this book's key terms to search within this book, across our collection, or across the Web. Skim This Chapter Skim this chapter and use this chapter's key terms to search within this book. Reference Finder Paste in your own text to find books that relate to your topic. Citation Manager . "Appendix D History of Recommended Values for Probability of Growth." Preventing the Forward Contamination of Mars. Washington, DC: The National Academies Press, 2006. Please select a format: Page 140   E-mail Share on facebook Facebook Share on delicious Delicious Share on stumbleupon Stumble Share on twitter Twitter More Sharing ServicesMore The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. D History of Recommended Values for Probability of Growth Historically, the approach used to evaluate planetary protection requirements for spacecraft sent to Mars depended on efforts to estimate the probability Pg that Earth microorganisms would grow in the martian environment (see Chapter 2). As shown in Figure D.1, estimates of Pg varied by ten orders of magnitude during the period from 1964 to 1978. As the committee discusses in Chapter 5, the scientific basis for estimates of Pg—knowledge about the capability of Earth microorganisms to survive and propagate on Mars—remains strongly limited. FIGURE D.1 Estimates of the probability of growth (Pg) of Earth microorganisms on the planet Mars. SOURCE: H.P. Klein. 1992. History of Pg. Pp. 41-52 in Planetary Protection Issues for the MESUR Mission: Probability of Growth (Pg), H.P. Klein, ed. NASA CP 3167. NASA, Washington, D.C. Page 140 Front Matter (R1-R12) Executive Summary (1-10) 1 Introduction (11-21) 2 Policies and Practices in Planetary Protection (22-35) 3 Future Mars Exploration: The Rolling Wave (36-40) 4 Environments on Mars Relative to Life (41-68) 5 Expanding Our Knowledge of the Limits of Life on Earth (69-90) 6 Advances in Technologies for Life Detection and Bioburden Reduction (91-104) 7 Assessing Non-Living Contaminants of Concern (105-110) 8 A Path Forward for Planetary Protection in the 21st Century (111-123) 9 Transition Process and Time Line (124-128) Appendix A Biographical Sketches of Committee Members and Staff (129-134) Appendix B Recommendations from Two Previous NRC Reports on Forward Contamination (135-137) Appendix C Summary of Procedures Currently Used to Assess Bioburden in Spacecraft Assembly Clean Rooms and on Spacecraft (138-139) Appendix D History of Recommended Values for Probability of Growth (140-140) Appendix E Approaches to Bioburden Reduction for Lander Missions to Mars (141-143) Appendix F Ambiguities in Geomorphic Interpretation: Martian Gullies (144-147) Appendix G Spacecraft Propellant and By-Products as Potential Contaminants (148-151) Appendix H Acronyms and Abbreviations (152-154)

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Preventing the Forward Contamination of Mars D History of Recommended Values for Probability of Growth Historically, the approach used to evaluate planetary protection requirements for spacecraft sent to Mars depended on efforts to estimate the probability Pg that Earth microorganisms would grow in the martian environment (see Chapter 2). As shown in Figure D.1, estimates of Pg varied by ten orders of magnitude during the period from 1964 to 1978. As the committee discusses in Chapter 5, the scientific basis for estimates of Pg—knowledge about the capability of Earth microorganisms to survive and propagate on Mars—remains strongly limited. FIGURE D.1 Estimates of the probability of growth (Pg) of Earth microorganisms on the planet Mars. SOURCE: H.P. Klein. 1992. History of Pg. Pp. 41-52 in Planetary Protection Issues for the MESUR Mission: Probability of Growth (Pg), H.P. Klein, ed. NASA CP 3167. NASA, Washington, D.C.