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Les Protozoaires

Les Protozoaires

          
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About the Book

IntroductionEXAMINONS AU MICROSCOPE une goutte d'eau d'étang; une goutte d'eau d'étang; un véritable monde en miniature se révèle, peuple par une multitude d'organismes invisibles a l'oeil nu. Bon nombre d'entre eux appartiennent à l'embranchement du protozoaire: leur taille varie de plusieurs microns à quelques millimètres. Certains protozoaires ont des affinâtes végétales; ils possèdent des pigments a l'aide desquels ils peuvent fabriquer des substances nutritives par photosynthèse. On va même jusqu'à les classer parmi les plantes .Ils se rapprochent nettement, pourtant, d'autres espèce de protozoaires qui, eux, sont dépourvus de pigments et doivent se nourrir comme le font les animaux car ils ne peuvent synthétiser leur nourriture.La plupart des protozoaires sont des êtres unicellulaires constitues d'une seule masse de protoplasme comprenant un seul noyau et entourée d'une membrane protoplasmique plus ou moins différenciée. Nous en verrons qui sont plurinucléés et d'autres ou plusieurs individus s'associent pour former une colonie. Un protozoaire n'est pas un organisme simple. Il suffit de le comparer aux cellules spécialisées forme un tissu et les tissus, a leur tour les organes qui servent aux animaux pour se déplacer, pour respirer, excréter, se reproduire, etc. chez le protozoaire, toutes ces activités doivent avoir leur siège dans l'infime grain de protoplasme qui le constitue tout entier. A l'encontre des protozoaires, les cellules spécialisées des métazoaires, ou animaux pluricellulaires, sont incapables de vie indépendante.Leur complexité même permet aux protozoaires de s'adapter à une gamme variée d'environnements. Ils pullulent dans les étangs d'eau fraiche ou d'eau stagnante, les mares d'eau de pluie, les marais et les ruisseaux. On les trouve en abondance dans la boue, dans le sol humide, dans les marais salants et même jusque dans les sources thermales dont la température atteint 1500 F. Beaucoup d'espèces sont marines; on en trouve découvert dans les bancs de neige. De nombreuses espèces vivent en parasites dans les cavités, dans les tissus ou même a l'intérieur des cellules des plantes comme des animaux.


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Product Details
  • ISBN-13: 9781712537909
  • Publisher: Independently Published
  • Publisher Imprint: Independently Published
  • Height: 229 mm
  • No of Pages: 26
  • Spine Width: 2 mm
  • Width: 152 mm
  • ISBN-10: 1712537903
  • Publisher Date: 27 Nov 2019
  • Binding: Paperback
  • Language: French
  • Returnable: N
  • Weight: 54 gr


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