Talk:Cyanobacteria
From Academic Kids
Few of comments/suggestions on recent change:
- Great! It's nice to see this article mature.
- What does "gliding" mean in "They lack flagella but may move about by gliding." How do they glide, and is this under their own power? (I admit: I almost asked if this was "intentional", but then I remembered they're bacteria :-)
- They glide actively by convulsions, supporting themselves against some substrate. Andres 09:28, 11 Aug 2004 (UTC)
- "...the nitrogen-fixing protein complex may be packaged into specialized cells called heterocysts." Aren't bacteria single-celled? Does specialized "cells" mean something like organelles? This all seems to contradict my limited knowledge of biology.
- Several cells may live together, forming filaments (or colonies). Andres 09:28, 11 Aug 2004 (UTC)
- If someone knows more (or even a bit) about the lichen story, I'd encourage you to add the info to the endosymbiont article, which currently is heavily slanted to endosymbionts in insects (I wrote it; it's all I know about endosymbionts)
- "This organization closely resembles that of chloroplasts, which are believed to be derived from endosymbiotic cyanobacteria. In particular the pigments of most cyanobacteria are very similar to those of red algae." I don't see how the second sentence follows from the first -- how does the pigment of cyanobacteria relate to chloroplasts?
Zashaw 22:03 Mar 31, 2003 (UTC)
"...cyanobacteria have been found from around 3800 million years ago, making cyanobacteria some..." - is this 3800 million years number correct? Can't we just put 3.8 billion years?
Fcrick 19:03, 18 Nov 2003 (UTC)
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Re: Evidence of cyanobacterial microfossil controversy
Questioning the oldest signs of life Simpson S SCIENTIFIC AMERICAN 288 (4): 70-77 APR 2003
Questioning the evidence for Earth's oldest fossils Brasier MD, Green OR, Jephcoat AP, et al. NATURE 416 (6876): 76-81 MAR 7 2002
Necessary, but not sufficient: Raman identification of disordered carbon as a signature of ancient life Pasteris JD, Wopenka B ASTROBIOLOGY 3 (4): 727-738 WIN 2003
Earth's oldest (similar to 3.5 Ga) fossils and the 'Early Eden hypothesis': Questioning the evidence Brasier M, Green O, Lindsay J, Steele A ORIGINS OF LIFE AND EVOLUTION OF THE BIOSPHERE 34 (1-2): 257-269 FEB 2004
Archean microfossils: a reappraisal of early life on Earth Altermann W, Kazmierczak J RESEARCH IN MICROBIOLOGY 154 (9): 611-617 NOV 2003
Self-assembled silica-carbonate structures and detection of ancient microfossils Garcia-Ruiz JM, Hyde ST, Carnerup AM, Christy AG, Van Kranendonk MJ, Welham NJ SCIENCE 302 (5648): 1194-1197 NOV 14 2003
Recognizing and interpreting the fossils of early eukaryotes Javaux EJ, Knoll AH, Walter M ORIGINS OF LIFE AND EVOLUTION OF THE BIOSPHERE 33 (1): 75-94 FEB 2003
Morphology: An ambiguous indicator of biogenicity Ruiz JMG, Canerup A, Christy AG, Welham NJ, Hyde ST ASTROBIOLOGY 2 (3): 353-369 FAL 2002
Laser-Raman spectroscopy (Communication arising): Images of the Earth's earliest fossils? Pasteris JD, Wopenka B NATURE 420 (6915): 476-477 DEC 5 2002
Laser-Raman spectroscopy (Communication arising): Images of the Earth's earliest fossils? Reply Schopf JW, Kudryavtsev AB, Agresti DG, Wdowiak TJ, Czaja AD NATURE 420 (6915): 477-477 DEC 5 2002
Atomic force microscopy of Precambrian microscopic fossils Kempe A, Schopf JW, Altermann W, Kudryavtsev AB, Heckl WM PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 99 (14): 9117-9120 JUL 9 2002
Microfossils: Squaring up over ancient life Dalton R NATURE 417 (6891): 782-784 JUN 20 2002
23 May 2004
Orders
At the moment, the classification of cyanobacteria is confused. The standard morphology based orders could be used if we really wanted, but they're obsolete and so I don't think they add anything to the article. It looks like at the moment, cyanobacteria are divided into five sections, simply referred to as I-V. I think we should hold off on adding subdivisions until a better system emerges. Josh 18:05, 31 Aug 2004 (UTC)
- ok - maybe it could be useful to add some note in the taxobox to prevent future additions. Also the subdivision box is useful to navigate towards more specific articles... Azhyd 18:12, Aug 31, 2004 (UTC)
Some further checking shows that aside from the prochlorophytes, the orders you added are the same as the sections, but with standard Linnaean names given. However, it looks like the sections aren't supported by phylogeny either, with the two exceptions of Nostocales and Stigonematales. Anyways, since I managed to confuse even myself with this, I'll add some discussion of this to the article. Josh
- OK no orders then. The most recent treatment of the Cyanobacteria I can find is here (http://ijs.sgmjournals.org/content/vol54/issue5/#INTERNATIONAL_COMMITTEE_ON_SYSTEMATICS_OF_PROKARYOTES__TAXONOMIC_NOTES)
Bacteria
I think this should be changed to Cyanoprokaryote(s).
Much modern up-to-date classification recognizes that Cyanoprokaryotes show significant differences from either Bacteria or Archae and should rightly belong in their own classification within prokaryotes.--ZayZayEM 12:13, 23 Oct 2004 (UTC)
Cyanobacteria is still the much more common term. If there turn out to be many different groups of prokaryotes, I imagine we will go back to using bacteria and prokaryotes as synonyms rather than further restricting the group. At least this is done by Cavalier-Smith, who has argued for a while that the eubacteria comprise several different groups. It would be very interesting to see a reference on this, though, because it would presumably have more information for us about the relationships between the different groups. Josh
Photosynthetic bacteria - proposal=
Perhaps someone who knows the topic should write the article photosynthetic bacteria. Also, can someone check what is the relationship between Cyanobacteria and T.aquaticus and describe it more specifically in the article Geyser? Thanks. --Eleassar777 14:36, 23 Mar 2005 (UTC)
