The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform
Maria Angeles Garcia Del Cura - One of the best experts on this subject based on the ideXlab platform.
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prokaryotic and viral community of the sulfate rich crust from penahueca Ephemeral Lake an astrobiology analogue
Environmental Microbiology, 2019Co-Authors: Anabelen Martincuadrado, Ece Senel, Manuel Martinezgarcia, Ana Cifuentes, Fernando Santos, Cristina Almansa, Mercedes Morenopaz, Yolanda Blanco, Miriam Garciavilladangos, Maria Angeles Garcia Del CuraAbstract:: Penahueca is an athalassohaline hypersaline inland Ephemeral Lake originated under semiarid conditions in the central Iberian Peninsula (Spain). Its chemical composition makes it extreme for microbial life as well as a terrestrial analogue of other planetary environments. To investigate the persistence of microbial life associated with sulfate-rich crusts, we applied cultivation-independent methods (optical and electron microscopy, 16S rRNA gene profiling and metagenomics) to describe the prokaryotic community and its associated viruses. The diversity for Bacteria was very low and was vastly dominated by endospore formers related to Pontibacillus marinus of the Firmicutes phylum. The archaeal assemblage was more diverse and included taxa related to those normally found in hypersaline environments. Several 'metagenome assembled genomes' were recovered, corresponding to new species of Pontibacillus, several species from the Halobacteria and one new member of the Nanohaloarchaeota. The viral assemblage, although composed of the morphotypes typical of high salt systems, showed little similarity to previously isolated/reconstructed halophages. Several putative prophages of Pontibacillus and haloarchaeal hosts were identified. Remarkably, the Penahueca sulfate-rich metagenome contained CRISPR-associated proteins and repetitions which were over 10-fold higher than in most hypersaline systems analysed so far.
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Prokaryotic and viral community of the sulfate‐rich crust from Peñahueca Ephemeral Lake, an astrobiology analogue
Environmental Microbiology, 2019Co-Authors: Ana Belen Martin-cuadrado, Ece Senel, Ana Cifuentes, Fernando Santos, Cristina Almansa, Yolanda Blanco, Manuel Martinez-garcia, Mercedes Moreno-paz, Miriam García-villadangos, Maria Angeles Garcia Del CuraAbstract:Penahueca is an athalassohaline hypersaline inland Ephemeral Lake originated under semiarid conditions in the central Iberian Peninsula (Spain). Its chemical composition makes it extreme for microbial life as well as a terrestrial analogue of other planetary environments. To investigate the persistence of microbial life associated with sulfate‐rich crusts, we applied cultivation‐independent methods (optical and electron microscopy, 16S rRNA gene profiling and metagenomics) to describe the prokaryotic community and its associated viruses. The diversity for Bacteria was very low and was vastly dominated by endospore formers related to Pontibacillus marinus of the Firmicutes phylum. The archaeal assemblage was more diverse and included taxa related to those normally found in hypersaline environments. Several ‘metagenome assembled genomes’ were recovered, corresponding to new species of Pontibacillus, several species from the Halobacteria and one new member of the Nanohaloarchaeota. The viral assemblage, although composed of the morphotypes typical of high salt systems, showed little similarity to previously isolated/reconstructed halophages. Several putative prophages of Pontibacillus and haloarchaeal hosts were identified. Remarkably, the Penahueca sulfate‐rich metagenome contained CRISPR‐associated proteins and repetitions which were over 10‐fold higher than in most hypersaline systems analysed so far.
A L Herczeg - One of the best experts on this subject based on the ideXlab platform.
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Groundwater recharge and discharge dynamics in an arid‐zone Ephemeral Lake system, Australia
Limnology and Oceanography, 2009Co-Authors: Justin F Costelloe, Elizabeth C Irvine, A W Western, A L HerczegAbstract:The Coongie Lakes are a series of Ephemeral freshwater Lakes on the lower reaches of Cooper Creek, a large intermittent river of the arid Lake Eyre Basin, Australia. Hydrogeological, chemical, and isotopic observations, in conjunction with numerical modeling of groundwater responses to Lake inundation events, have been used to identify the dominant processes linking shallow, unconfined groundwater with the hydrology of the Lakes during wet and dry periods. The Lakes are predominantly zones of net groundwater recharge during inundation events. However, soil profile data suggests that drying of some of these Lakes allows evaporative groundwater discharge to occur through the soil profile of the dry Lake beds, resulting in salinization of the soil profile of the more Ephemeral Lakes. The occurrence of young, high-salinity groundwater is best explained by variations in soil profile flushing in response to wet and dry interannual periods of river discharge. During interannual drier phases, when filling of previously dry Lakes is more common, recharge is mostly via macropore flow during the rising stage of the inundation. Increased salinization of the Lake-bed sediments occurs during longer dry periods due to transport of solutes to the near-surface from Lake-bed evaporation and limited flushing of the soil profile because of the macropore-dominated flow during recharge. During wet periods, recharge is more likely dominated by matrix flow that results in leaching of the soil profile and increased export of solutes into the alluvial aquifer.
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groundwater recharge and discharge dynamics in an arid zone Ephemeral Lake system australia
Limnology and Oceanography, 2009Co-Authors: Justin F Costelloe, Elizabeth C Irvine, A W Western, A L HerczegAbstract:The Coongie Lakes are a series of Ephemeral freshwater Lakes on the lower reaches of Cooper Creek, a large intermittent river of the arid Lake Eyre Basin, Australia. Hydrogeological, chemical, and isotopic observations, in conjunction with numerical modeling of groundwater responses to Lake inundation events, have been used to identify the dominant processes linking shallow, unconfined groundwater with the hydrology of the Lakes during wet and dry periods. The Lakes are predominantly zones of net groundwater recharge during inundation events. However, soil profile data suggests that drying of some of these Lakes allows evaporative groundwater discharge to occur through the soil profile of the dry Lake beds, resulting in salinization of the soil profile of the more Ephemeral Lakes. The occurrence of young, high-salinity groundwater is best explained by variations in soil profile flushing in response to wet and dry interannual periods of river discharge. During interannual drier phases, when filling of previously dry Lakes is more common, recharge is mostly via macropore flow during the rising stage of the inundation. Increased salinization of the Lake-bed sediments occurs during longer dry periods due to transport of solutes to the near-surface from Lake-bed evaporation and limited flushing of the soil profile because of the macropore-dominated flow during recharge. During wet periods, recharge is more likely dominated by matrix flow that results in leaching of the soil profile and increased export of solutes into the alluvial aquifer.
Justin F Costelloe - One of the best experts on this subject based on the ideXlab platform.
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Groundwater recharge and discharge dynamics in an arid‐zone Ephemeral Lake system, Australia
Limnology and Oceanography, 2009Co-Authors: Justin F Costelloe, Elizabeth C Irvine, A W Western, A L HerczegAbstract:The Coongie Lakes are a series of Ephemeral freshwater Lakes on the lower reaches of Cooper Creek, a large intermittent river of the arid Lake Eyre Basin, Australia. Hydrogeological, chemical, and isotopic observations, in conjunction with numerical modeling of groundwater responses to Lake inundation events, have been used to identify the dominant processes linking shallow, unconfined groundwater with the hydrology of the Lakes during wet and dry periods. The Lakes are predominantly zones of net groundwater recharge during inundation events. However, soil profile data suggests that drying of some of these Lakes allows evaporative groundwater discharge to occur through the soil profile of the dry Lake beds, resulting in salinization of the soil profile of the more Ephemeral Lakes. The occurrence of young, high-salinity groundwater is best explained by variations in soil profile flushing in response to wet and dry interannual periods of river discharge. During interannual drier phases, when filling of previously dry Lakes is more common, recharge is mostly via macropore flow during the rising stage of the inundation. Increased salinization of the Lake-bed sediments occurs during longer dry periods due to transport of solutes to the near-surface from Lake-bed evaporation and limited flushing of the soil profile because of the macropore-dominated flow during recharge. During wet periods, recharge is more likely dominated by matrix flow that results in leaching of the soil profile and increased export of solutes into the alluvial aquifer.
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groundwater recharge and discharge dynamics in an arid zone Ephemeral Lake system australia
Limnology and Oceanography, 2009Co-Authors: Justin F Costelloe, Elizabeth C Irvine, A W Western, A L HerczegAbstract:The Coongie Lakes are a series of Ephemeral freshwater Lakes on the lower reaches of Cooper Creek, a large intermittent river of the arid Lake Eyre Basin, Australia. Hydrogeological, chemical, and isotopic observations, in conjunction with numerical modeling of groundwater responses to Lake inundation events, have been used to identify the dominant processes linking shallow, unconfined groundwater with the hydrology of the Lakes during wet and dry periods. The Lakes are predominantly zones of net groundwater recharge during inundation events. However, soil profile data suggests that drying of some of these Lakes allows evaporative groundwater discharge to occur through the soil profile of the dry Lake beds, resulting in salinization of the soil profile of the more Ephemeral Lakes. The occurrence of young, high-salinity groundwater is best explained by variations in soil profile flushing in response to wet and dry interannual periods of river discharge. During interannual drier phases, when filling of previously dry Lakes is more common, recharge is mostly via macropore flow during the rising stage of the inundation. Increased salinization of the Lake-bed sediments occurs during longer dry periods due to transport of solutes to the near-surface from Lake-bed evaporation and limited flushing of the soil profile because of the macropore-dominated flow during recharge. During wet periods, recharge is more likely dominated by matrix flow that results in leaching of the soil profile and increased export of solutes into the alluvial aquifer.
Anabelen Martincuadrado - One of the best experts on this subject based on the ideXlab platform.
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prokaryotic and viral community of the sulfate rich crust from penahueca Ephemeral Lake an astrobiology analogue
Environmental Microbiology, 2019Co-Authors: Anabelen Martincuadrado, Ece Senel, Manuel Martinezgarcia, Ana Cifuentes, Fernando Santos, Cristina Almansa, Mercedes Morenopaz, Yolanda Blanco, Miriam Garciavilladangos, Maria Angeles Garcia Del CuraAbstract:: Penahueca is an athalassohaline hypersaline inland Ephemeral Lake originated under semiarid conditions in the central Iberian Peninsula (Spain). Its chemical composition makes it extreme for microbial life as well as a terrestrial analogue of other planetary environments. To investigate the persistence of microbial life associated with sulfate-rich crusts, we applied cultivation-independent methods (optical and electron microscopy, 16S rRNA gene profiling and metagenomics) to describe the prokaryotic community and its associated viruses. The diversity for Bacteria was very low and was vastly dominated by endospore formers related to Pontibacillus marinus of the Firmicutes phylum. The archaeal assemblage was more diverse and included taxa related to those normally found in hypersaline environments. Several 'metagenome assembled genomes' were recovered, corresponding to new species of Pontibacillus, several species from the Halobacteria and one new member of the Nanohaloarchaeota. The viral assemblage, although composed of the morphotypes typical of high salt systems, showed little similarity to previously isolated/reconstructed halophages. Several putative prophages of Pontibacillus and haloarchaeal hosts were identified. Remarkably, the Penahueca sulfate-rich metagenome contained CRISPR-associated proteins and repetitions which were over 10-fold higher than in most hypersaline systems analysed so far.
B. J. Griffin - One of the best experts on this subject based on the ideXlab platform.
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Crystal features of supergene gold at Hannan South, Western Australia
Mineralium Deposita, 1994Co-Authors: L. M. Lawrance, B. J. GriffinAbstract:Deep weathering of basalt-hosted sulphidic gold mineralisation has resulted in remobilisation of the gold and the formation of a supergene deposit. The deposit occurs beneath an Ephemeral Lake system and is at least partially saturated by highly saline groundwater. A general downward movement of an iron redox front associated with the weathering has controlled the distribution of the gold and its morphology. It is unusual in that the high fineness gold crystals formed are coarse and well-preserved. Small octahedra, up to 50 μm, are the most abundant form of gold crystals but large, up to 3 mm, octahedral plates are common. Crystal morphology variations described here suggest that the gold is initially precipitated as euhedral octahedra and plates. Subsequent dissolution and recrystallisation associated with fluctuations in the chemical environment above the redox front has led to the development of the more common irregular dendritic or wire gold forms observed in other supergene deposits.