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La molécule et son double
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ISBN10: 2010169247
ISBN13: 9782010169243
Publisher: Hachette Litteratures
Published: Feb 21 2022
Pages: 130
Weight: 0.34
Height: 0.28 Width: 5.32 Depth: 8.47
Language: French
ISBN13: 9782010169243
Publisher: Hachette Litteratures
Published: Feb 21 2022
Pages: 130
Weight: 0.34
Height: 0.28 Width: 5.32 Depth: 8.47
Language: French
Une énigme hante la science: les acides aminés, composant la matière vivante, qui, pour le chimiste, peuvent exister, comme nos deux mains, sous une forme droite ou gauche, présentent la propriété surprenante d'être tous de la même main . Pasteur disait que ces molécules naturelles étaient dissymétriques . Une autre découverte vient de relancer la question. L'Univers lui-même se trouve affecté d'une brisure de symétrie décisive: celle qui a donné l'avantage à la matière sur l'antimatière. Ainsi les scénarios des astrophysiciens rejoignent les travaux des biologistes moléculaires, esquissant une ligne du cosmos à la vie. Les conséquences pratiques du sens de la vie sont immenses. En laboratoire, on peut synthétiser des produits à la fois sous la forme gauche et droite mais l'efficacité d'un insecticide ou d'un médicament, par exemple, et aussi leurs effets secondaires dépendent du dédoublement de la molécule qui les compose; droite ou gauche , ce n'est pas du pareil au même.
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