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Could fungi survive in brines on Mars?
In recent news releases, Mars rover scientist Andrew Knoll stated
Mars may have been to salty for life: Was Mars too salty for life? Posted: Friday, February 15, 2008 3:54 PM by Alan Boyle http://cosmiclog.msnbc.msn.com/archi...15/668749.aspx Knoll stated only a handful of Earth organisms could survive in the salty conditions they found prevailed at the Meridiani landing site. He doesn't say which types of organisms he is referring to but is notable that certain types of fungi can also survive in high levels of salinity, and at below freezing temperatures. This is interesting because fungi have a nucleus, unlike simple bacteria, and are therefore considered to be a more advanced life form than bacteria. In fact they are sometimes regarded by biologists as being more closely related to animals than to plant-life. Life Sci Space Res. 1979;17:95-8. Growth of fungi in NaCl-MgSO4 brines. Siegel SM, Siegel BZ. Department of Botany and Pacific Biomedical Research Center, University of Hawaii, Honolulu, Hawaii 96822, USA. "Long-term studies have shown that common fungi of the Penicillium- Aspergillus group can be grown in a variety of brines or on moist salt crystals, simulating a range of natural terrestrial habitats such as salt flats, or special water-bodies such as the Dead Sea. In general, salt media rich in KCl are favored over other alkali halides; the media become more selective as the salt concentration rises and nutrient requirements become more complex. We here demonstrate that media which resemble the Dead Sea salt mix can support the growth of selected fungal strains, even in the absence of reduced organic nutrients other than glucose. Such media may serve as models for localized microhabitats on Mars." http://www.ncbi.nlm.nih.gov/pubmed/12296355 Life Sci Space Res. 1976;14:351-4. Performance of fungi in low temperature and hypersaline environments. Siegel SM, Speitel TW. Department of Botany, University of Hawaii, Honolulu, Hawaii, USA. "During the past ten years we have observed a broad array of stress capabilities in common fungi including ability to grow in aqueous ammonia and other alkaline solutions, in acids, in the presence of heavy metals, and in various salt media at low temperature. This report is concerned primarily with (a) the performance of Aspergillaceae in a variety of saturated salts, (b) distinctive roles for K+ and Rb+ ions, and (c) the lowest temperatures at which growth in nutrient brines has been observed, namely 267 degrees K in as little as 14 days. We also describe a novel solid medium based upon gelatin, glycerol and water in which fungal cultures growing at 248 degrees K can be directly examined under oil-immersion magnification. The performance capabilities of the fungi show that tolerance or adaptability to harsh and extreme physical-chemical environments cannot be considered a unique feature of prokaryotic life forms. Salt flats, brine pools and other natural hypersaline environments have long been recognized as real ecological niches harboring a range of biota from pseudomonad bacteria and green algae to specialized crustaceans. A notable omission in this ecological record is the fungi, although the group is known to include marine forms." http://www.ncbi.nlm.nih.gov/pubmed/12678120 Bob Clark |
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Could fungi survive in brines on Mars?
On Mar 9, 10:30*am, Robert Clark wrote:
*In recent news releases, Mars rover scientist Andrew Knoll stated Mars may have been to salty for life: Was Mars too salty for life? Posted: Friday, February 15, 2008 3:54 PM by Alan Boylehttp://cosmiclog.msnbc.msn.com/archive/2008/02/15/668749.aspx *Knoll stated only a handful of Earth organisms could survive in the salty conditions they found prevailed at the Meridiani landing site. He doesn't say which types of organisms he is referring to but is notable that certain types of fungi can also survive in high levels of salinity, and at below freezing temperatures. This is interesting because fungi have a nucleus, unlike simple bacteria, and are therefore considered to be a more advanced life form than bacteria. In fact they are sometimes regarded by biologists as being more closely related to animals than to plant-life. Life Sci Space Res. 1979;17:95-8. Growth of fungi in NaCl-MgSO4 brines. Siegel SM, Siegel BZ. Department of Botany and Pacific Biomedical Research Center, University of Hawaii, Honolulu, Hawaii 96822, USA. "Long-term studies have shown that common fungi of the Penicillium- Aspergillus group can be grown in a variety of brines or on moist salt crystals, simulating a range of natural terrestrial habitats such as salt flats, or special water-bodies such as the Dead Sea. In general, salt media rich in KCl are favored over other alkali halides; the media become more selective as the salt concentration rises and nutrient requirements become more complex. We here demonstrate that media which resemble the Dead Sea salt mix can support the growth of selected fungal strains, even in the absence of reduced organic nutrients other than glucose. Such media may serve as models for localized microhabitats on Mars."http://www.ncbi.nlm.nih.gov/pubmed/12296355 Life Sci Space Res. 1976;14:351-4. Performance of fungi in low temperature and hypersaline environments. Siegel SM, Speitel TW. Department of Botany, University of Hawaii, Honolulu, Hawaii, USA. "During the past ten years we have observed a broad array of stress capabilities in common fungi including ability to grow in aqueous ammonia and other alkaline solutions, in acids, in the presence of heavy metals, and in various salt media at low temperature. This report is concerned primarily with (a) the performance of Aspergillaceae in a variety of saturated salts, (b) distinctive roles for K+ and Rb+ ions, and (c) the lowest temperatures at which growth in nutrient brines has been observed, namely 267 degrees K in as little as 14 days. We also describe a novel solid medium based upon gelatin, glycerol and water in which fungal cultures growing at 248 degrees K can be directly examined under oil-immersion magnification. The performance capabilities of the fungi show that tolerance or adaptability to harsh and extreme physical-chemical environments cannot be considered a unique feature of prokaryotic life forms. Salt flats, brine pools and other natural hypersaline environments have long been recognized as real ecological niches harboring a range of biota from pseudomonad bacteria and green algae to specialized crustaceans. A notable omission in this ecological record is the fungi, although the group is known to include marine forms."http://www.ncbi.nlm.nih.gov/pubmed/12678120 Bob Clark Have they found any signs of life at all on Mars yet? |
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Could fungi survive in brines on Mars?
Robert Clark wrote:
In recent news releases, Mars rover scientist Andrew Knoll stated Mars may have been to salty for life: [snip usual uninformed hysteria] When was the last time you saw anything growing in acidic Espom salt solution? -- Uncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/lajos.htm#a2 |
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Could fungi survive in brines on Mars?
On Mar 9, 10:30 am, Robert Clark wrote:
http://en.wikipedia.org/wiki/Extremophile Tom Davidson Richmond, VA |
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Could fungi survive in brines on Mars?
In sci.physics Uncle Al wrote:
Robert Clark wrote: In recent news releases, Mars rover scientist Andrew Knoll stated Mars may have been to salty for life: [snip usual uninformed hysteria] When was the last time you saw anything growing in acidic Espom salt solution? About 15 minutes ago; rose bushes. But you only use about a quarter cup of Epsom salt per mature bush per year around February through April, which means its time to go feed the roses now. -- Jim Pennino Remove .spam.sux to reply. |
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Could fungi survive in brines on Mars?
On Mar 9, 5:09 pm, wrote:
Have they found any signs of life at all on Mars yet? The Viking Mars missions during the 70's are considered to be inconclusive. The Viking life experiments gave some possible indications of life but the reactions were different from those expected. A separate experiment, the Viking GCMS, designed to detect organic molecules, which would be required for life, was unable to detect any organic molecules to within the level of its sensitivity, which was fairly good for the time. However, more recent experiments have shown it is possible for microbes to exist in soil at such low levels that GCMS type experiments would not have been able to detect organic molecules. Most Mars scientists suggest more sensitive organic detectors need to be sent. This becomes more imperative with the recent detection of methane in Mars atmosphere, which is considered an organic molecule. Note though the mere presence of methane or other such simple organic molecules is not proof of life since these can also be produced through abiotic, chemical processes. Bob Clark |
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Could fungi survive in brines on Mars?
Further refs on life surviving at or nearly at saturation levels of salts: Brine organisms and the question of habitat-specific adaptation. Origins of Life and Evolution of Biospheres. Volume 14, Numbers 1-4 / December, 1984 "Abstract Among the well-known ultrasaline terrestrial habitats, the Dead Sea in the Jordan Rift Valley and Don Juan Pond in the Upper Wright Valley represent two of the most extreme. The former is a saturated sodium chloride-magnesium sulfate brine in a hot desert, the latter a saturated calcium chloride brine in an Antarctic desert. Both Dead Sea and Don Juan water bodies themselves are limited in microflora, but the saline Don Juan algal mat and muds contain abundant nutrients and a rich and varied microbiota, includingOscillatoria,Gleocapsa,Chlorella, diatoms,Penicillium and bacteria. In such environments, the existence of an array of specific adaptations is a common, and highly reasonable, presumption, at least with respect to habitat-obligate forms. Nevertheless, many years of ongoing study in our laboratory have demonstrated that lichens (e.g.Cladonia), algae (e.g.Nostoc) and fungi (e.g.Penicillium,Aspergillus) from the humid tropics can sustain metabolism down to -40°C and growth down to -10°C in simulated Dead Sea or Don Juan (or similar) media without benefit of selection or gradual acclimation. Non-selection is suggested in fungi by higher growth rates from vegetative inocula than spores. The importance of nutrient parameters was also evident in responses to potassium and reduced nitrogen compounds. In view of the saline performance of tropicalNostoc, and its presence in the Antarctic dry valley soils, its complete absence in our Don Juan mat samples was and remains a puzzle. We suggest that adaptive capability is already resident in many terrestrial life forms not currently in extreme habitats, a possible reflection of evolutionary selection for wide spectrum environmental adaptability." http://www.springerlink.com/content/r0565304t64835nv/ Reports The Enigma of Prokaryotic Life in Deep Hypersaline Anoxic Basins. "Evidence that microbial life is possible at 5 M MgCl2 widens the picture of microbial adaptation to salinity. It has been suggested that primordial life on earth started in hyper-saline water (28, 29); furthermore, extra-terrestrial objects are known to contain brines exposed to evaporation, which results in an increase of divalent cations (30, 31). Our results indicate that microbial metabolism can proceed at significant levels in some of the most extreme terrestrial hyper-saline environments and lend further support to the possibility of extraterrestrial life." Science 7 January 2005: Vol. 307. no. 5706, pp. 121 - 123. http://www.sciencemag.org/cgi/content/full/307/5706/121 Interestingly, the first says fungi might survive in brines at the maximum temperature range that might appear at the Mars Phoenix landing site. Of course, the temperatures would fall to lower than this during the polar night and Winter. But perhaps they could go into suspended spore-like form then. And the second gives references that argue life might have originated in hypersaline environments, in contrast to the Knoll view that it could not have started there. Bob Clark |
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Could fungi survive in brines on Mars?
On Sun, 9 Mar 2008 07:30:08 -0700 (PDT), Robert Clark
wrote: In recent news releases, Mars rover scientist Andrew Knoll stated Mars may have been to salty for life: Was Mars too salty for life? Posted: Friday, February 15, 2008 3:54 PM by Alan Boyle http://cosmiclog.msnbc.msn.com/archi...15/668749.aspx Knoll stated only a handful of Earth organisms could survive in the salty conditions they found prevailed at the Meridiani landing site. He doesn't say which types of organisms he is referring to but is notable that certain types of fungi can also survive in high levels of salinity, and at below freezing temperatures. This is interesting because fungi have a nucleus, unlike simple bacteria, and are therefore considered to be a more advanced life form than bacteria. In fact they are sometimes regarded by biologists as being more closely related to animals than to plant-life. snip citations Fungi may survive high levels of salinity and extreme conditions, but they are heterotrophs and need to eat other organisms or their byproducts (including dead bodies). Whatever other requirements may be involved, you certainly have to think first of autotrophs, either chemosynthetic or photosynthetic. |
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Could fungi survive in brines on Mars?
Isn't infomercial spewed science wonderful. One published conjecture
or SWAG now has Mars as too salty, except there's no actual signs of all that supposed salt, other than various mineral salts that have nothing to do with remains of common sea-salt or of surface rock-salt deposits as found here on earth. As best we can tell, Mars was a once-upon-a-time fresh water swamp like environment, as sustained primarily from its geothermal core energy and otherwise not by way of the relatively poor solar influx of its past. Little of anything greater than slime molds or fungi ever existed without having been ET imported or perhaps panspermia derived. BTW, without a viable magnetosphere and insufficient atmosphere, that Mars fungi (imported or local) had best be of a rad-hard species, as well as tough spore like antifreeze rated, as each and every nighttime the near vacuum of that pathetic environment sucks the life out of most anything. Even the best of robotics are going to be hard pressed to function within those crystal dry-ice nighttimes. .. - Brad Guth Robert Clark wrote: In recent news releases, Mars rover scientist Andrew Knoll stated Mars may have been to salty for life: Was Mars too salty for life? Posted: Friday, February 15, 2008 3:54 PM by Alan Boyle http://cosmiclog.msnbc.msn.com/archi...15/668749.aspx Knoll stated only a handful of Earth organisms could survive in the salty conditions they found prevailed at the Meridiani landing site. He doesn't say which types of organisms he is referring to but is notable that certain types of fungi can also survive in high levels of salinity, and at below freezing temperatures. This is interesting because fungi have a nucleus, unlike simple bacteria, and are therefore considered to be a more advanced life form than bacteria. In fact they are sometimes regarded by biologists as being more closely related to animals than to plant-life. Life Sci Space Res. 1979;17:95-8. Growth of fungi in NaCl-MgSO4 brines. Siegel SM, Siegel BZ. Department of Botany and Pacific Biomedical Research Center, University of Hawaii, Honolulu, Hawaii 96822, USA. "Long-term studies have shown that common fungi of the Penicillium- Aspergillus group can be grown in a variety of brines or on moist salt crystals, simulating a range of natural terrestrial habitats such as salt flats, or special water-bodies such as the Dead Sea. In general, salt media rich in KCl are favored over other alkali halides; the media become more selective as the salt concentration rises and nutrient requirements become more complex. We here demonstrate that media which resemble the Dead Sea salt mix can support the growth of selected fungal strains, even in the absence of reduced organic nutrients other than glucose. Such media may serve as models for localized microhabitats on Mars." http://www.ncbi.nlm.nih.gov/pubmed/12296355 Life Sci Space Res. 1976;14:351-4. Performance of fungi in low temperature and hypersaline environments. Siegel SM, Speitel TW. Department of Botany, University of Hawaii, Honolulu, Hawaii, USA. "During the past ten years we have observed a broad array of stress capabilities in common fungi including ability to grow in aqueous ammonia and other alkaline solutions, in acids, in the presence of heavy metals, and in various salt media at low temperature. This report is concerned primarily with (a) the performance of Aspergillaceae in a variety of saturated salts, (b) distinctive roles for K+ and Rb+ ions, and (c) the lowest temperatures at which growth in nutrient brines has been observed, namely 267 degrees K in as little as 14 days. We also describe a novel solid medium based upon gelatin, glycerol and water in which fungal cultures growing at 248 degrees K can be directly examined under oil-immersion magnification. The performance capabilities of the fungi show that tolerance or adaptability to harsh and extreme physical-chemical environments cannot be considered a unique feature of prokaryotic life forms. Salt flats, brine pools and other natural hypersaline environments have long been recognized as real ecological niches harboring a range of biota from pseudomonad bacteria and green algae to specialized crustaceans. A notable omission in this ecological record is the fungi, although the group is known to include marine forms." http://www.ncbi.nlm.nih.gov/pubmed/12678120 Bob Clark |
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Could fungi survive in brines on Mars?
On Mar 9, 10:30 am, Robert Clark wrote:
In recent news releases, Mars rover scientist Andrew Knoll stated Mars may have been to salty for life: Was Mars too salty for life? Posted: Friday, February 15, 2008 3:54 PM by Alan Boylehttp://cosmiclog.msnbc.msn.com/archive/2008/02/15/668749.aspx Knoll stated only a handful of Earth organisms could survive in the salty conditions they found prevailed at the Meridiani landing site. He doesn't say which types of organisms he is referring to but is notable that certain types of fungi can also survive in high levels of salinity, and at below freezing temperatures. I thought there were bacteria that live in high salinity environments. They go into a dormant state under hostile conditions. In fact, some of them have been revived after 500 Million years. This dormancy may be useful on Mars, which may thaw out every few thousand years. Of course, these bacteria are heterotrophs. And there is that UV problem, and the problem of high concentrations of peroxides. But maybe the autotrophs live underneath the dust, where they can metabolize peroxides. Can any earth organisms metabolize peroxides? Peroxides seem to me to be a fine source of energy. Oxygen itself is an oxidizer, and highly poisonous to many bacteria. High concentrations of oxygen are lethal even to Homo sapiens. Maybe a peroxide chomping autotroph, deep underground near a volcano where there is liquid water, there lies a prokaryote breathing in carbon dioxide and soaking in those peroxides, while enjoying the high salinity of the area. If there are creatures that can survive those condition separately, here on earth, there is no reason to exclude the possibility of life that survives the combination of these things. The only condition which I feel is absolutely essential is liquid water, for at least some periods in the history of Mars. No liquid water, no life. The other issues seem negotiable. |
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