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Home > History and Archaeology > History > Ueber Kern- Und Zelltheilung Im Pflanzenreiche; Nebst Einem Anhang Uber Befruchtung (1)
Ueber Kern- Und Zelltheilung Im Pflanzenreiche; Nebst Einem Anhang Uber Befruchtung (1)

Ueber Kern- Und Zelltheilung Im Pflanzenreiche; Nebst Einem Anhang Uber Befruchtung (1)


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About the Book

Dieses historische Buch kann zahlreiche Tippfehler und fehlende Textpassagen aufweisen. Kaufer konnen in der Regel eine kostenlose eingescannte Kopie des originalen Buches vom Verleger herunterladen (ohne Tippfehler). Ohne Indizes. Nicht dargestellt. 1888 edition. Auszug: ...frischer Zellen die Entscheidung so schwieriger Fragen zulasse, musste mir von vornherein fraglich erscheinen, und war ich daher gleich geneigt, mehr Gewicht auf das aus Alcohol-Material gewonnene Resultat zu legen. Der Widerspruch zwischen dem frischen und dem Alcohol-Material konnte mich auch um so weniger zu Gunsten des ersteren stimmen, als Frank Schwarz inzwischen ausdrucklich hervorgehoben hatte, dass die Alcoholbehandlung auf die Verdaulichkeit des Zellkerns ohne Einfluss sei8) und dass es auch vollstandig gleichgiltig ware, ob man frisches oder mit Alcohol fixirtes Cytoplasma der Verdauung unterwerfe3). Freilich sollte es sich nach Frank Schwarz bei den Zacharias'schen Verdauungsversuchen gar nicht um Pepsinwirkungen, sondern nur um den Einfluss verdunnter Salzsaure bei hoherer Temperatur handeln4), was ich jedoch nicht bestatigen kann. Ich stellte meine Versuche, so wie Zacharias, mit schwach salzsaurer Pepsinlosung an, um zu sehen, wie sich frisches Material in derselben verhalte. Ich operirte auch mit denselben Pollenmutterzellen, wie Zacharias, namlich mit denjenigen von Helleborus foetidus. E. Zacharias giebt an5): Die Pollenmutterzellen (mit Kernen im Spindelstadium) wurden frisch in Verdauungsflussigkeit gebracht und nach 24 Stunden 1) Ebendas. p. 347. 2) Die morphologische und chemische Zusammensetzung des Protoplasma (Cohn, Beitrage zur Biologie der Pflanzen, Bd. V) p. 118. 3) 1. c. p. 180. 4) 1. c. p. 121. 5) Bot. Ztg. 1887, p. 346. darin untersucht. Der Zellplasmarest sah nun stark gequollen aus, grenzte sich aber deutlich gegen den spindelformigen Kernraum ab, in welchem ausser den stark glanzenden...


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Product Details
  • ISBN-13: 9781234467623
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 74
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1234467623
  • Publisher Date: 24 Jan 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 150 gr

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Ueber Kern- Und Zelltheilung Im Pflanzenreiche; Nebst Einem Anhang Uber Befruchtung (1)
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