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Toxische Eisenkonzentration in verschiedenen Bodenhorizonten? Analyse von Bodenproben aus dem Raum Fürth

Toxische Eisenkonzentration in verschiedenen Bodenhorizonten? Analyse von Bodenproben aus dem Raum Fürth

          
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About the Book

Facharbeit (Schule) aus dem Jahr 2009 im Fachbereich Chemie - Analytische Chemie, Note: 1,3, Sprache: Deutsch, Abstract: Der deutsche Arzt Paracelsus behauptete 1538, alle Dinge seien Gift und allein die Dosis mache, dass etwas kein Gift sei. Diese medizinische Grundregel hat bis heute nichts von ihrer Gültigkeit verloren. Im Gegenteil: In den letzten Jahrhunderten taten sich durch den Fortschritt der Medizin immer neue Felder auf, bei denen neue Heilmittel aus ursprünglich giftigen Stoffen entwickelt wurden. Dies lässt sich besonders anschaulich an Schlangengiften sehen, die auch als Basis für Medikamente und Gegengifte Verwendung finden. Doch nicht nur von vornherein "schädliche" Stoffe, sondern auch "gute" Stoffe können schädlich sein - je nachdem, wie konzentriert sie aufgenommen werden. Eisen an sich ist für höhere Organismen ein essentielles Spurenelement. Besonders Pflanzen benötigen es für ihr Wachstum, für die Biosynthese von Proteinen, Enzymen und für die Synthese des grünen Blattfarbstoffs - dem Chlorophyll. Dieses ist die Voraussetzung für die Photosynthese, ohne die die gesamten Lebensvorgänge auf der Erde undenkbar wären. Essentiell bedeutet in der Biologie und Chemie, dass ein bestimmter Stoff nicht vom Organismus aus anderen Nährstoffen synthetisiert werden kann. Der Organismus muss sich dieses Spurenelement also von außen verschaffen, um überleben zu können. Dies geschieht bei Pflanzen ausschließlich über Wurzeln aus dem Boden. Falls das Eisen nicht in ausreichender Konzentration zur Verfügung steht, führt dies bei Pflanzen zu typischen Mangelerscheinungen: die jungen Blätter verfärben sich gelb, werden fast weißlich und haben charakteristische grüne Blattadern. Auch wird das Wachstum der Pflanze und der jungen Blätter eingeschränkt. Im Gegensatz dazu wirkt Eisen in höheren Konzentrationen für den Pflanzenorganismus toxisch. Diese Arbeit soll untersuchen, ob Paracelsus' Grundsatz bezüglich des essentiellen Spurenelements Eisen auf Böden in C


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Product Details
  • ISBN-13: 9783668030312
  • Publisher: Grin Verlag
  • Publisher Imprint: Grin Verlag
  • Height: 210 mm
  • No of Pages: 32
  • Series Title: German
  • Weight: 54 gr
  • ISBN-10: 3668030316
  • Publisher Date: 16 Sep 2015
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Spine Width: 2 mm
  • Width: 148 mm


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