File:Bullettino delle sedute della Accademia gioenia di scienze naturali in Catania (1903) (20515751961).jpg

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Title: Bullettino delle sedute della Accademia gioenia di scienze naturali in Catania
Identifier: bullettin778819031906acca (find matches)
Year: 1893 (1890s)
Authors: Accademia gioenia di scienze naturali in Catania
Subjects: Science
Publisher: Catania, Italy, Accademia gioenia di scienze naturali
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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in molti Infusori, come si osserva in Urocentrum turbo, Blephari- sma laeteritia e mnsevhis, Dasytrica rìminantinm, nel genere An- eistrnm ete. Molti si soiìo proposti di s()iegare siiitattii frammen- tazione: Stein (1) per la Blepliariwia osservò che potesse trattarsi di individui da fresco coniugati. Secondo Issel (2), die ha seguito le idee di R. Hertwig, la frammentazione del macronucleo potrebbe essere nn fatto fisiolo- gico, conseguente ad un soverchio accrescimento delhi massa nu- cleare a spese del citoplasma. I^oi crediamo invece che si tratti di ben altro fenomeno, avendo osservato molti casi, tutti fra loro diversi, di divisione del macronucleo. Prima di tutto notiamo che il suo frazionamento è un fenomeno diverso di quella particolare scissione, che prece- de la riproduzione agamica. Nel primo caso si osserva che il ma-
Text Appearing After Image:
Fig. 1. — Cryptochilum Echini con macro- Fig. 2. —Individuo con niacronucleo diviso nucleo allungato trasversalmente all'asse in due frammenti, maggiore ed in via di frammentazione, : mentre il micronucleo è indiviso —M. ma- cronucleo, m. micronucleo. (1) Der Orgauisraus der Infusionstliiere — Natnrg. d. HeterotrichoD Tnfnso- rieu. Leipzig 1867. (2) Aucistridi del Golfo di Napoli—Mittlieil. Zool. Station zu Neapel 1903.

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https://www.flickr.com/photos/internetarchivebookimages/20515751961/

Author Internet Archive Book Images
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(Reusing this file)		 At the time of upload, the image license was automatically confirmed using the Flickr API. For more information see Flickr API detail.
Volume
InfoField
1903
Flickr tags
InfoField
  • bookid:bullettin778819031906acca
  • bookyear:1893
  • bookdecade:1890
  • bookcentury:1800
  • bookauthor:Accademia_gioenia_di_scienze_naturali_in_Catania
  • booksubject:Science
  • bookpublisher:Catania_Italy_Accademia_gioenia_di_scienze_naturali
  • bookcontributor:Smithsonian_Libraries
  • booksponsor:Biodiversity_Heritage_Library
  • bookleafnumber:238
  • bookcollection:biodiversity
  • BHL Collection
  • BHL Consortium
Flickr posted date
InfoField
12 August 2015



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