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Natural Science Forum / Biology / Microbiology / February 2006Motile fungi
Are thre motle fungi? I thought that motile individuals were moving via flagella and were bacteria. What I am dealing with now is "Google zoospores and you will find that contrary to all other fungus they are mobile with both amoebic motion and flagella. The info came from more than one source, zoospores are just not generally well known." Is this true? The fungi in question are at least 75 million years old. Gary Gaugler, Ph.D. Microtechnics, Inc. Granite Bay, CA 95746 916.791.8191 gary@microtechnics dot com >Are thre motle fungi? I thought that motile individuals were >moving via flagella and were bacteria. What I am dealing with now is [quoted text clipped - 5 lines] > >Is this true? yes The oomycetes are aquatic fungi (unusual) and have motile spores (unusual, but perhaps appropriate). It is often said that they do not fit well in the fungi group. Certainly, they are talked about much less than common molds, yeasts, mushrooms. I wonder if the new proposal to reclassify eukaryotic microbes does anything new with them. bob >>Are thre motle fungi? I thought that motile individuals were >>moving via flagella and were bacteria. What I am dealing with now is [quoted text clipped - 17 lines] > >bob Thanks for the reply. These apparent fungi are all that remain in the vessels of femur from 75M year old dinosaur findings. The species are believed to be T rex or Triceratops. Here are some pix of the fungi clusters: http://www.microtechnics.com/ball2area-1kx-1.jpg http://www.microtechnics.com/femur-2-2200x-1.jpg The apparent soft tissue in the bone or the bone itself shows tracks where some organism (the fungi?) had moved all over and displaced and consumed(?) some of the material. If you or anyone else has any idea, please let me know. all input is appreciated. Gary Gaugler, Ph.D. Microtechnics, Inc. Granite Bay, CA 95746 916.791.8191 gary@microtechnics dot com We had plenty of infectious fungal parasites in our marine diatom cultures. They are very common flagellates that settle on a substrate, shed their flagella and become a zoospore. No doubt that will happen with your stuff if it sinks to the bottom of the sea before sedimentation. As said, their relation with the true fungi is doubtful but they are certainly eukaryotic. Nice images, btw! René >We had plenty of infectious fungal parasites in our marine diatom >cultures. They are very common flagellates that settle on a substrate, [quoted text clipped - 7 lines] > >René Thanks very much for the info and insite and for the feedback on images. This all helps a lot. These specimens are probably from fresh water areas that were inland lakes or even part of the sea (than salt-based) millions of years ago. EDS shows trace amounts of Na and Cl. So it might indicate that the speicmens are from an inland sea. In fossiled state, the zoospores are primarily composed of O, Fe and P according to EDS analysis. The surrounding area is mostly Si, Al and Fe. Others have reported C, Ti, O, Si, P, Cl and K. When the fossilized femur is converted to soft tissue and minerals are removed using HF, tracks are seen in the assumed tissue. Do you think that these tracks are consistent with what a zoospore would do? See image at: http://www.microtechnics.com/bridge1.jpg I still have to sort out the elemental complement based on some trace elements. Thanks. Gary Gaugler, Ph.D. Microtechnics, Inc. Granite Bay, CA 95746 916.791.8191 gary@microtechnics dot com Gary, In the kingdom Fungi therre are 4 divisions or phyla. They all are characterized by having vegetative structures composed of chitinous cell wall, unlike plants which have primary walls made of cellulose. One of the 4 phyla - the chytridiomycota also called chytrids - have flagella. The other 3 phhyla - Zygomycota, Ascomycota and Basidiomycota - do not produce cells with flagella on them. The chytrids produce cells with a single, posteriorally-oriented, whiplash type flagellum. To see what these flagellated cells look like, do a Google image search with the name Allomyces. Another responder wrote to you about the group of "aquatic fungi" called the Oomycetes. These organisms are no longer thought to be true fungi because they produce cell walls of cellulose. They are more animal-like than they are fungal-like based on DNA sequence analysis. These water molds do have flagellated cells but there are two flagella on each motile cell. One is a posteriorly-oriented, whiplash type flagellum and the other is anteriorly-orented, tinsel type flagellum. To see one of these zoospores do a Google image search on the name Saprolegnia. I hope this helps. John Clausz > Are thre motle fungi? I thought that motile individuals were > moving via flagella and were bacteria. What I am dealing with now is [quoted text clipped - 13 lines] > 916.791.8191 > gary@microtechnics dot com >Gary, > [quoted text clipped - 21 lines] > >John Clausz Thanks for the response. All input helps. The problem I face is trying to correlate what I see today for specimens that are millions of years old. I am not used to this. Thus, the dilemma is to sort out what is valid today relative to what is seen in very old specimens. Is/are the principles of what we know today applicable to legacy specimens? In this case, really old specimens. Converting fossilized specimens into soft tissue involves a lot of work. What I fear is that this process will distort the true nature of the specimen. Demineralization is a big deal. If I use CaCl2 or GuHCl or MgCl2, et. al., then what does this do to the specimen and actual EDS results? My other method is buffered HF (HF+Ammonium Flouride). Tricky. Gary Gaugler, Ph.D. Microtechnics, Inc. Granite Bay, CA 95746 916.791.8191 gary@microtechnics dot com |
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