The Limits of Organic Life in Planetary Systems

The Limits of Organic Life in Planetary Systems PDF

Author: National Research Council

Publisher: National Academies Press

Published: 2007-07-26

Total Pages: 116

ISBN-13: 030910484X

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The search for life in the solar system and beyond has to date been governed by a model based on what we know about life on Earth (terran life). Most of NASA's mission planning is focused on locations where liquid water is possible and emphasizes searches for structures that resemble cells in terran organisms. It is possible, however, that life exists that is based on chemical reactions that do not involve carbon compounds, that occurs in solvents other than water, or that involves oxidation-reduction reactions without oxygen gas. To assist NASA incorporate this possibility in its efforts to search for life, the NRC was asked to carry out a study to evaluate whether nonstandard biochemistry might support life in solar system and conceivable extrasolar environments, and to define areas to guide research in this area. This book presents an exploration of a limited set of hypothetical chemistries of life, a review of current knowledge concerning key questions or hypotheses about nonterran life, and suggestions for future research.

Sounding the Limits of Life

Sounding the Limits of Life PDF

Author: Stefan Helmreich

Publisher: Princeton University Press

Published: 2015-10-27

Total Pages: 324

ISBN-13: 0691164819

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What is life? What is water? What is sound? In Sounding the Limits of Life, anthropologist Stefan Helmreich investigates how contemporary scientists—biologists, oceanographers, and audio engineers—are redefining these crucial concepts. Life, water, and sound are phenomena at once empirical and abstract, material and formal, scientific and social. In the age of synthetic biology, rising sea levels, and new technologies of listening, these phenomena stretch toward their conceptual snapping points, breaching the boundaries between the natural, cultural, and virtual. Through examinations of the computational life sciences, marine biology, astrobiology, acoustics, and more, Helmreich follows scientists to the limits of these categories. Along the way, he offers critical accounts of such other-than-human entities as digital life forms, microbes, coral reefs, whales, seawater, extraterrestrials, tsunamis, seashells, and bionic cochlea. He develops a new notion of "sounding"—as investigating, fathoming, listening—to describe the form of inquiry appropriate for tracking meanings and practices of the biological, aquatic, and sonic in a time of global change and climate crisis. Sounding the Limits of Life shows that life, water, and sound no longer mean what they once did, and that what count as their essential natures are under dynamic revision.

Life at the Limits

Life at the Limits PDF

Author: David A. Wharton

Publisher: Cambridge University Press

Published: 2007-07-23

Total Pages: 321

ISBN-13: 1139431943

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We are fascinated by the seemingly impossible places in which organisms can live. There are frogs that freeze solid, worms that dry out and bacteria that survive temperatures over 100 ̊C. What seems extreme to us is, however, not extreme to these organisms. In this captivating account, the reader is taken on a tour of extreme environments, and shown the remarkable abilities of organisms to survive a range of extreme conditions, such as high and low temperatures and desiccation. This book considers how organisms survive major stresses and what extreme organisms can tell us about the origin of life and the possibilities of extraterrestrial life. These organisms have an extreme biology, which involves many aspects of their physiology, ecology and evolution.

Life Within Limits

Life Within Limits PDF

Author: Michael Jackson

Publisher: Duke University Press

Published: 2011-02-16

Total Pages: 246

ISBN-13: 0822349159

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An exploration of life satisfaction, happiness, and wellbeing in the first world and third world.

Size Limits of Very Small Microorganisms

Size Limits of Very Small Microorganisms PDF

Author: National Research Council

Publisher: National Academies Press

Published: 1999-09-13

Total Pages: 171

ISBN-13: 0309172748

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How small can a free-living organism be? On the surface, this question is straightforward-in principle, the smallest cells can be identified and measured. But understanding what factors determine this lower limit, and addressing the host of other questions that follow on from this knowledge, require a fundamental understanding of the chemistry and ecology of cellular life. The recent report of evidence for life in a martian meteorite and the prospect of searching for biological signatures in intelligently chosen samples from Mars and elsewhere bring a new immediacy to such questions. How do we recognize the morphological or chemical remnants of life in rocks deposited 4 billion years ago on another planet? Are the empirical limits on cell size identified by observation on Earth applicable to life wherever it may occur, or is minimum size a function of the particular chemistry of an individual planetary surface? These questions formed the focus of a workshop on the size limits of very small organisms, organized by the Steering .Group for the Workshop on Size Limits of Very Small Microorganisms and held on October 22 and 23, 1998. Eighteen invited panelists, representing fields ranging from cell biology and molecular genetics to paleontology and mineralogy, joined with an almost equal number of other participants in a wide-ranging exploration of minimum cell size and the challenge of interpreting micro- and nano-scale features of sedimentary rocks found on Earth or elsewhere in the solar system. This document contains the proceedings of that workshop. It includes position papers presented by the individual panelists, arranged by panel, along with a summary, for each of the four sessions, of extensive roundtable discussions that involved the panelists as well as other workshop participants.

Complete Course in Astrobiology

Complete Course in Astrobiology PDF

Author: Gerda Horneck

Publisher: John Wiley & Sons

Published: 2008-06-25

Total Pages: 434

ISBN-13: 3527619003

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This up-to-date resource is based on lectures developed by experts in the relevant fields and carefully edited by the leading astrobiologists within the European community. Aimed at graduate students in physics, astronomy and biology and their lecturers, the text begins with a general introduction to astrobiology, followed by sections on basic prebiotic chemistry, extremophiles, and habitability in our solar system and beyond. A discussion of astrodynamics leads to a look at experimental facilities and instrumentation for space experiments and, ultimately, astrobiology missions, backed in each case by the latest research results from this fascinating field. Includes a CD-ROM with additional course material.

Living Beyond the Limits

Living Beyond the Limits PDF

Author: Franklin Graham

Publisher: Thomas Nelson

Published: 1998

Total Pages: 250

ISBN-13: 9780785271840

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In "Living Beyond the Limits," Franklin Graham focuses on God's principles and promises essential to a full life. He relates real-life examples of men and women who have put God's Word into practice under some of the most challenging circumstances imaginable. You'll be amazed by their stories. You'll also be stirred and challenged as never before.

Living within Limits

Living within Limits PDF

Author: Garrett Hardin

Publisher: Oxford University Press

Published: 1995-04-06

Total Pages: 350

ISBN-13: 0198024037

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"We fail to mandate economic sanity," writes Garrett Hardin, "because our brains are addled by...compassion." With such startling assertions, Hardin has cut a swathe through the field of ecology for decades, winning a reputation as a fearless and original thinker. A prominent biologist, ecological philosopher, and keen student of human population control, Hardin now offers the finest summation of his work to date, with an eloquent argument for accepting the limits of the earth's resources--and the hard choices we must make to live within them. In Living Within Limits, Hardin focuses on the neglected problem of overpopulation, making a forceful case for dramatically changing the way we live in and manage our world. Our world itself, he writes, is in the dilemma of the lifeboat: it can only hold a certain number of people before it sinks--not everyone can be saved. The old idea of progress and limitless growth misses the point that the earth (and each part of it) has a limited carrying capacity; sentimentality should not cloud our ability to take necessary steps to limit population. But Hardin refutes the notion that goodwill and voluntary restraints will be enough. Instead, nations where population is growing must suffer the consequences alone. Too often, he writes, we operate on the faulty principle of shared costs matched with private profits. In Hardin's famous essay, "The Tragedy of the Commons," he showed how a village common pasture suffers from overgrazing because each villager puts as many cattle on it as possible--since the costs of grazing are shared by everyone, but the profits go to the individual. The metaphor applies to global ecology, he argues, making a powerful case for closed borders and an end to immigration from poor nations to rich ones. "The production of human beings is the result of very localized human actions; corrective action must be local....Globalizing the 'population problem' would only ensure that it would never be solved." Hardin does not shrink from the startling implications of his argument, as he criticizes the shipment of food to overpopulated regions and asserts that coercion in population control is inevitable. But he also proposes a free flow of information across boundaries, to allow each state to help itself. "The time-honored practice of pollute and move on is no longer acceptable," Hardin tells us. We now fill the globe, and we have no where else to go. In this powerful book, one of our leading ecological philosophers points out the hard choices we must make--and the solutions we have been afraid to consider.

A Life Without Limits

A Life Without Limits PDF

Author: Chrissie Wellington

Publisher: Center Street

Published: 2012-05-15

Total Pages: 191

ISBN-13: 1455510939

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In 2007, Chrissie Wellington shocked the triathlon world by winning the Ironman World Championships in Hawaii. As a newcomer to the sport and a complete unknown to the press, Chrissie's win shook up the sport. A LIFE WITHOUT LIMITS is the story of her rise to the top, a journey that has taken her around the world, from a childhood in England, to the mountains of Nepal, to the oceans of New Zealand, and the trails of Argentina, and first across the finish line. Wellington's first-hand, inspiring story includes all the incredible challenges she has faced--from anorexia to near--drowning to training with a controversial coach. But to Wellington, the drama of the sports also presents an opportunity to use sports to improve people's lives. A LIFE WITHOUT LIMITS reveals the heart behind Wellington's success, along with the diet, training and motivational techniques that keep her going through one of the world's most grueling events.

What Kind of Life

What Kind of Life PDF

Author: Daniel Callahan

Publisher: What Kind of Life

Published: 1995

Total Pages: 318

ISBN-13: 9780878405732

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From the author of Setting Limits comes a challenging exploration of the proper goals of medicine in our rapidly changing society--a work destined to spark debate and influence policy for years to come.