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Charles Krebs
Joined: 01 Aug 2006
Posts: 4072
Location: Issaquah, WA USA
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 Posted: Wed Nov 08, 2006 12:28 pm Post subject: A few new amoeba tests |
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As always, I am fascinated by the tests created by these amoeba species. A couple weeks ago I squeezed out some mosses that I had collected into a smaller container. Now I get a pretty good assortment of testate amoeba from the sediment in that container. Here are a few...
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beetleman
Joined: 04 Aug 2006
Posts: 3578
Location: Southern New Hampshire USA
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| Posted: Wed Nov 08, 2006 9:53 pm Post subject: |
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Excellent pictures, Incredible subjects...what is going on in the third picture? Is that one animal?
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Take Nothing but Pictures--Leave Nothing but Footprints.
Doug Breda |
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bernhardinho
Joined: 13 Aug 2006
Posts: 506
Location: Germany
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| Posted: Thu Nov 09, 2006 7:14 am Post subject: |
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| beetleman wrote: | | .what is going on in the third picture? Is that one animal? |
Hi,
I'm sure this is cell division, which is part of the answer to a question that Charles put the other day: how do testacea build their "houses"?
Bernhard |
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Gyrosigma
Joined: 04 Aug 2006
Posts: 102
Location: France Normandie
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| Posted: Fri Nov 10, 2006 3:21 am Post subject: |
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hello everybody,
not sure about cell division, I think it's "conjugaison" (I hope this french word is the same in English...)
division weakens the genetic structure of the cells , so after a moment...
the two Cyphoderia are melting there genetic material to begin a new cell wich will be regenerate.
you can see in an animation made by a friend of mine Jean Marie Cavanihac what's append on Mikroscopia, the french forum http://forum.mikroscopia.com/index.php?showtopic=1373&hl
best regards
Dominique |
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beetleman
Joined: 04 Aug 2006
Posts: 3578
Location: Southern New Hampshire USA
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| Posted: Fri Nov 10, 2006 5:37 am Post subject: |
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SO, this is two testate amoebas, joined together, and mixing genetic material to form a new individual? Does one amoeba have the new individual or do both have one? Sorry for all the questions 
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Take Nothing but Pictures--Leave Nothing but Footprints.
Doug Breda |
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bernhardinho
Joined: 13 Aug 2006
Posts: 506
Location: Germany
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| Posted: Fri Nov 10, 2006 11:11 am Post subject: |
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| Gyrosigma wrote: | hello everybody,
not sure about cell division, I think it's "conjugaison" (I hope this french word is the same in English...)
Dominique |
Hi Dominique,
Conjugation is a form of mating in ciliates only, I've never ever read about Testacea performing anything else than cell division.
Bernhard |
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bernhardinho
Joined: 13 Aug 2006
Posts: 506
Location: Germany
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| Posted: Fri Nov 10, 2006 2:42 pm Post subject: |
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Hi again,
I've scanned a page from Grell: Protozoologie.
Bernhard |
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Gyrosigma
Joined: 04 Aug 2006
Posts: 102
Location: France Normandie
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| Posted: Sat Nov 11, 2006 1:16 am Post subject: |
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OK Bernhard,
you are certainely right.... I will tell my french friends about this...
best regards
Dominique |
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