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Symbiotic Planet [Anglais] [Broché]

Lynn Margulis
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Descriptions du produit

Symbiotic Planet Lynn Margulis shows that symbiosis - members of different species living in physical contact with one another - is crucial to the origins of evolutionary novelty. Ranging from bacteria to the Earth itself, Margulis explains the symbiotic origins of many of evolution's most important innovations. Full description

Détails sur le produit

  • Broché: 176 pages
  • Editeur : Basic Books; Édition : New edition (17 septembre 1999)
  • Langue : Anglais
  • ISBN-10: 0465072720
  • ISBN-13: 978-0465072729
  • Dimensions du produit: 20 x 13 x 1 cm
  • Moyenne des commentaires client : 5.0 étoiles sur 5  Voir tous les commentaires (1 commentaire client)
  • Classement des meilleures ventes d'Amazon: 77.659 en Livres anglais et étrangers (Voir les 100 premiers en Livres anglais et étrangers)
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Première phrase
Symbiosis, the system in which members of different species live in physical contact, strikes us as an arcane concept and a specialized biological term. Lire la première page
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Couverture | Copyright | Table des matières | Extrait | Index | Quatrième de couverture
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Format:Format Kindle|Achat vérifié
Lynn Margulis et James Lovelock nous font comprendre que toutes les formes de vie sur Terre sont intimement interconnectées et interdépendantes les unes des autres. L'espèce qui l'oublie risque fort d'en faire elle-même les frais. L'hypothèse dite de Gaïa s'est bien vite affirmée comme "La théorie de Gaïa". Aucun biologiste, aucun "vert", aucun dirigeant politique ne devrait l'ignorer. Détruire l'environnement, le climat, décimer des forêts et des espèces vivantes, animales, végétales, insectes, c'est nous détruire nous-mêmes.
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Amazon.com: 4.1 étoiles sur 5  24 commentaires
42 internautes sur 44 ont trouvé ce commentaire utile 
4.0 étoiles sur 5 Especially recommended for Margulis fans but not her best 14 janvier 2001
Par Amazon Customer - Publié sur Amazon.com
Format:Broché
I am a great admirer of the author, who is one of the most creative biologists alive today, and a tireless popularizer of the brilliant and exciting ideas that define her career. For fans like me, this book is a must, as it offers tidbits about the author's life, including her marriage to Carl Sagan. It is also valuable in that it seeks to respond to criticisms of the Gaia hypothesis. But for those new to Margulis' work, I would recommend starting with Microcosmos, which she wrote with her son Dorion Sagan, a truly wonderful book that everyone interested in biology or the environment should have on their shelves. If Microcosmos doesn't grab you, don't bother with Symbiotic Planet. If it does grab you, then you'll probably want to go on to this book and others by Margulis.
30 internautes sur 31 ont trouvé ce commentaire utile 
4.0 étoiles sur 5 The autobiography of an idea 24 décembre 2002
Par Stephen A. Haines - Publié sur Amazon.com
Format:Broché
Some years ago, Margulis promoted a new concept in evolution. Complex life developed from the merging of microbial forms of life. Elements of the cell such as mitochondria, chloroplasts and other organelles came from small, simple lifeforms invading larger cells. The idea was a long time in gaining acceptance, but is now part of conventional evolutionary texts. In this book, she expands her earlier work with some accounts of her life as a scientist and wife of Carl Sagan. She also goes beyond her earlier work to advance a new thesis on the accelerator of evolution - sex. While many of her ideas are presented in more detail elsewhere, this book is a good, quick introduction to fuller accounts of her thinking.
Margulis is an innovator - forceful in imparting her ideas. She portrays herself as a rebel from early in her career, arguing here that she was sceptical of "genes in the nucleus determin[ing] all the characteristics of plants and animals." Her misgivings received scant support, however, without a replacement thesis. She found one in symbiosis - the association of multiple organisms. It took many years of investigation, including initial rejection of her attempts to publish, before the idea of SET [Serial Endoymbiosis Theory] found acceptance. So much attention had been focussed the DNA in the cell nucleus that organelle structure and function had been essentially overlooked as irrelevant. That these organelles might have been independent organisms at some point was too novel. Her account of the struggle to gain recognition is related as one of dogged persistence, nearly devoid of outside support .
Moving through an interesting discussion of life's origins, she dismisses the notion that forms of nucleic acids arose before simple cells. She finds the natural occurence of lipids [fats] as the more likely precursors of complex life, with RNA and DNA arising as a way to give these fat globules more survival ability. As with her earlier thesis, this one will generate controversy, something Margulis seems nutured on.
Her proposal about the emergence of sex will come as a surprise to most readers. In a word, she suggests sex resulting from cannibalism. In Margulis' view, certain microbes under stress, notably the absence of food, turned on each other for survival. The cannibalism was not always fully consummated, she suggests, but the beginnings of mixing genetic material was begun in the process. Incomplete cannibalism could lead to the formation of a new, more complex organism. If this process occurred often enough within a compatible group, the new organism, obviously larger than its predecessors, would be more fit to compete.
In conclusion, Margulis makes a strong case in favour of James Lovelock's Gaia concept. This might have been a non-sequitor in the hands of someone less able to deal with novel ideas. Margulis stresses that Gaia has been mistakenly viewed as Earth's biosphere acting as a single organism. She argues that Gaia really means a global network - a "system of organisms." The Gaia concept means the elements of the "system" are tightly entangled and extinctions weaken the structure. If the extinction rate exceeds the rate of recovery the system is endangered. It's interesting to note in light of her definition that the Gaia website still refers to it as a "superorganism," not a "system of organisms." This disparity doesn't detract from Margulis' presentation, which is admirably presented. She offers enough graphic support for the text to clarify or enhance her themes. In all, this is a fine mind-opener in thinking about the development of early life. Readable by anyone interested in life's history and processes.
22 internautes sur 24 ont trouvé ce commentaire utile 
4.0 étoiles sur 5 Excellent summary with a few flaws 10 août 1999
Par Jeffrey Bickart - Publié sur Amazon.com
Format:Relié
Readable in a few hours, this book gives a quick introduction to a concept tremendously important to understanding the evolution on life on earth. I would have liked more extensive discussion of SET, with respect to the protoctists; the recognition of the development of these organisms from the symbiosis of various bacteria laid the groundwork for the understanding of symbiotic relationships in plants, animals, and fungi, which Margulis discusses in later chapters, yet the details of it take only a couple early chapters. Other volumes in this series are longer (some 170 pp.), and this one could have been, too. The clarification of "the Gaia hypothesis," in the last chapter, is very strong, and welcome; undergirding it is Margulis's insistence (throughout the book) on unsentimental and rigorous scientific thinking. The book does contain flaws. Editorial errors show a lack of careful proofreading (e.g., the date of the rediscovery of Mendel's work is given as 1990). Many sentences would have benefitted from more use of commas. More illustrations (e.g., of the structures of cells and organelles, mitosis, and meiosis) and summary equations for various metabolic processes, as well as a glossary, would make the book more accessible and useful to those who retain only a hazy knowledge (and that probably out-dated) of these things. Finally, Margulis takes too much the stance of the battered, then embraced and finally vindicated iconoclast, and seems rather too smug (as when she refers to "my SET theory"). It's just not attractive, and could have been toned down; it's obvious that she's brilliant. My criticisms, however, are relatively minor, and I recommend this book enthusiastically.
15 internautes sur 16 ont trouvé ce commentaire utile 
4.0 étoiles sur 5 Radical theories on the evolution of life on earth 3 septembre 2000
Par R. Griffiths - Publié sur Amazon.com
Format:Broché
I um'd and ah'd about how many stars to give this book. If I was just assessing the importance of Lynn Margulis's scientific work it would definitely receive five stars. Margulis is an underrated genius. Her work on symbiosis and evolution is extremely important. It reminds us that evolution is far more complex than a simple choice between neo-Darwinism and Lamarckism. Her connecting of her ideas to the Gaia hypothesis of James Lovelock is inspired. Unfortunately, this book shows why she might be getting less exposure than she deserves - it is not terribly well written. In fact, it reads as though it was produced in a hurry with almost no editing. Further, there are diagrams in the book which have no stated connection to the text (OK, you can work it out for yourself, but it still comes across as shoddy). Having said that, the style perhaps gives an insight into the person - clearly Margulis is a battler for her ideas. Its good to have something to read by her that is less weighty than her other seminal but hefty works. Sometimes here she can be very funny. I particularly liked her comments on James Lovelock's dislike of the patenting process. So in all, four stars - a very good book that with a little tightening up could be great.
10 internautes sur 10 ont trouvé ce commentaire utile 
4.0 étoiles sur 5 An enjoyable read of the evolution of cells 22 novembre 2000
Par Frank Bierbrauer - Publié sur Amazon.com
Format:Broché
To a large extent I agree with other reviewers in that the book is a quick read with some minor if annoying problems such as the obscure habit of inserting diagrams which appear to have no direct link to the text. If they do then it is not always obvious or well outlined. One also gets the impression the diagrams are very detailed for an audience of laymen and seem to be taken from medical texts, again one feels as though the book had been put together quickly, possibly under pressure from a publisher or some other reason.
Nonetheless Lynn Margulis is an accomplished biologist often highly underrated and fully deserving of her honours in the field where she developed the earlier idea of symbiogenesis of bacterial partners to form modern cell structure. One reviewer mentioned that she gives the impression of being self complementary and acting like an undertdog. I have personal experience of just such a scientist and one gets the feeling that a strong degree of self confidence, sometimes appearing as self congratulation or a seeming over emphasis to self advertise, is necessary to survive the sometimes personal barbs directed at an innovative scientist from others in his/her field, a healthy ego helps to persist in an environmemt which can go so far as to loose jobs and even give rise to ill health.
The book itself is very enjoyable and the personal anecdotes from Margulis's life lighten the story and help to put the reader in touch with the life of the scientists rather than being too impersonal. This also includes the fascinating characters represented by other scientists. Margulis strongly clarifies the concept of Gaia theory developed by James Lovelock in the seventies and removes the mystical element which a public lacking a spiritual element in their lives attach to it. Absolutely wonderful science and makes me want to check out more of her books and research.
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