Download Café, crème, savon et Cie: La petite chimie du matin de by Muriel Chiron-Charrier PDF

By Muriel Chiron-Charrier

Marie Curieuse... mais qui est donc Marie Curieuse ? Ce pourrait être vous, si tout comme elle, des questions vous assaillent dès le matin à l. a. sortie du lit : Quelle différence y-a-t-il entre los angeles théine et l. a. caféine ? remark le savon a-t-il été créé ? A quoi sert le collagène présent dans notre épiderme ? Avec quoi se maquillait Cléopâtre ?

Sur un ton à los angeles fois drôle et sérieux, l'auteure nous fait découvrir l'histoire d'un produit, les origines de ses composants, les réactions chimiques pour arriver à un tel résultat et son utilisation... bref l. a. petite chimie du matin ! Chaque partie est construite autour d'une thématique.

Les explications sont claires et concises et les illustrations décalées nous emportent dans le monde de Marie Curieuse.

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Extra resources for Café, crème, savon et Cie: La petite chimie du matin de Marie Curieuse

Sample text

Remodelling of bone, which is a continual process in adults, involves organised erosion and deposition of bone tissue by the various cells. A full cycle of remodelling takes about 3 mo. Types of Bone Metallurgists and engineers have at their disposal different building materials, whereas the two types of bone in the human skeleton are made of the same material. Compact and spongy bone differ mainly in their porosity, although compact bone is more organised than spongy bone. 1a). This meshwork arrangement makes spongy bone much more springy than compact bone.

This is the proportion of calcium salts to collagen in healthy adult bone. Almost all the body’s calcium is stored in bone and is released from there as required by other tissues, such as skeletal muscle, which requires calcium to contract. As already noted, collagen fibres compose most of the organic component of dry bone. Bone cells are another organic component of bone. In the matrix of bone, the basic cells are called osteocytes. Also associated with bone are bone-forming cells, called osteoblasts.

350-1350 AD) In the Middle Ages—the 1,000 yr period from approximately 350 to 1350 AD—scholarly attention to physical matters was essentially nonexistent. The Middle Ages was dominated by two philosophical beliefs, asceticism and scholasticism, both of which focused exclusive attention on matters of the spirit and the mind to the complete neglect, and indeed active suppression, of scholarly attempts to understand anything related to the body or human movement. Asceticism was a religious preoccupation with extreme self-denial of the physical in order to exclusively focus on spiritual matters as presented in the evolving Christian faiths.

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