Barbara Bayer
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View article: Metabolic response of a chemolithoautotrophic archaeon to carbon limitation
Metabolic response of a chemolithoautotrophic archaeon to carbon limitation Open
The ubiquitously distributed ammonia-oxidizing archaea generate energy from ammonia and build cell mass from inorganic carbon sources, thereby contributing to both the global nitrogen and carbon cycles. However, little is known about the r…
View article: Potential drivers and seasonal comparison of the methane paradox in three Austrian peri-Alpine lakes
Potential drivers and seasonal comparison of the methane paradox in three Austrian peri-Alpine lakes Open
Methane, traditionally thought to be produced only under anoxic conditions, is widely observed in oxic surface layers of freshwater lakes-a phenomenon known as "methane paradox". The methane paradox results from a complex interaction of bi…
View article: Metabolic Response of a Chemolithoautotrophic Archaeon to Carbon Limitation
Metabolic Response of a Chemolithoautotrophic Archaeon to Carbon Limitation Open
The ubiquitously distributed ammonia-oxidizing archaea generate energy from ammonia and build cell mass from inorganic carbon sources, thereby contributing to both the global nitrogen and carbon cycles. However, little is known about the r…
View article: Contribution of ammonia oxidizers to inorganic carbon fixation in the dark ocean
Contribution of ammonia oxidizers to inorganic carbon fixation in the dark ocean Open
Ammonia-oxidizing archaea are the most abundant chemolithoautotrophs in the ocean, comprising up to 40% of microbial cells in deep waters, and are assumed to dominate dissolved inorganic carbon (DIC) fixation below the sunlit surface layer…
View article: Genome sequence of <i>Nitrosopumilus adriaticus</i> CCS1 assembled from an ammonia-oxidizing enrichment culture
Genome sequence of <i>Nitrosopumilus adriaticus</i> CCS1 assembled from an ammonia-oxidizing enrichment culture Open
We report the metagenome-assembled genome of an ammonia-oxidizing archaeon that is closely related to Nitrosopumilus adriaticus NF5 but shows distinct genomic features compared to strain NF5.
View article: Metabolite release by nitrifiers facilitates metabolic interactions in the ocean
Metabolite release by nitrifiers facilitates metabolic interactions in the ocean Open
Microbial chemoautotroph-heterotroph interactions may play a pivotal role in the cycling of carbon in the deep ocean, reminiscent of phytoplankton-heterotroph associations in surface waters. Nitrifiers are the most abundant chemoautotrophs…
View article: Jellyfish detritus supports niche partitioning and metabolic interactions among pelagic marine bacteria
Jellyfish detritus supports niche partitioning and metabolic interactions among pelagic marine bacteria Open
Background Jellyfish blooms represent a significant but largely overlooked source of labile organic matter (jelly-OM) in the ocean, characterized by a high protein content. Decaying jellyfish are important carriers for carbon export to the…
View article: Additional file 10 of Seasonal patterns in microbial carbon and iron transporter expression in the Southern Ocean
Additional file 10 of Seasonal patterns in microbial carbon and iron transporter expression in the Southern Ocean Open
Additional file 10: Supplementary Table 1. Sample and replicate description. ES – Early spring, LS – Late summer. Supplementary Table 2. Detailed information on metatranscriptomic libraries. Supplementary Table 3. Detailed information on m…
View article: Jellyfish detritus supports niche partitioning and metabolic interactions among marine bacteria
Jellyfish detritus supports niche partitioning and metabolic interactions among marine bacteria Open
Background Jellyfish blooms represent a significant but largely overlooked source of labile organic matter (jelly-OM) in the ocean, characterized by a high protein content. Decaying jellyfish are important vehicles for carbon export to the…
View article: Controls on the relative abundances and rates of nitrifying microorganisms in the ocean
Controls on the relative abundances and rates of nitrifying microorganisms in the ocean Open
Nitrification controls the oxidation state of bioavailable nitrogen. Distinct clades of chemoautotrophic microorganisms – predominantly ammonia-oxidizing archaea (AOA) and nitrite-oxidizing bacteria (NOB) – regulate the two steps of nitrif…
View article: Carbon content, carbon fixation yield and dissolved organic carbon release from diverse marine nitrifiers
Carbon content, carbon fixation yield and dissolved organic carbon release from diverse marine nitrifiers Open
Nitrifying microorganisms, including ammonia‐oxidizing archaea, ammonia‐oxidizing bacteria, and nitrite‐oxidizing bacteria, are the most abundant chemoautotrophs in the ocean and play an important role in the global carbon cycle by fixing …
View article: Comment on bg-2022-139
Comment on bg-2022-139 Open
Nitrification controls the oxidation state of bioavailable nitrogen. Distinct clades of chemoautotrophic microorganisms – predominantly, ammonia-oxidizing archaea (AOA) and nitrite-oxidizing bacteria (NOB) – regulate the two steps of nitri…
View article: Prokaryotic Life in the Deep Ocean's Water Column
Prokaryotic Life in the Deep Ocean's Water Column Open
The oceanic waters below a depth of 200 m represent, in terms of volume, the largest habitat of the biosphere, harboring approximately 70% of the prokaryotic biomass in the oceanic water column. These waters are characterized by low temper…
View article: Controls on the relative abundances and rates of nitrifying microorganisms in the ocean
Controls on the relative abundances and rates of nitrifying microorganisms in the ocean Open
Nitrification controls the oxidation state of bioavailable nitrogen. Distinct clades of chemoautotrophic microorganisms – predominantly, ammonia-oxidizing archaea (AOA) and nitrite-oxidizing bacteria (NOB) – regulate the two steps of nitri…
View article: Complete Genome Sequences of Two Phylogenetically Distinct <i>Nitrospina</i> Strains Isolated from the Atlantic and Pacific Oceans
Complete Genome Sequences of Two Phylogenetically Distinct <i>Nitrospina</i> Strains Isolated from the Atlantic and Pacific Oceans Open
The complete genome sequences of two chemoautotrophic nitrite-oxidizing bacteria of the genus Nitrospina are reported. Nitrospina gracilis strain Nb-211 was isolated from the Atlantic Ocean, and Nitrospina sp. strain Nb-3 was isolated from…
View article: Marine and terrestrial nitrifying bacteria are sources of diverse bacteriohopanepolyols
Marine and terrestrial nitrifying bacteria are sources of diverse bacteriohopanepolyols Open
Hopanoid lipids, bacteriohopanols and bacteriohopanepolyols, are membrane components exclusive to bacteria. Together with their diagenetic derivatives, they are commonly used as biomarkers for specific bacterial groups or biogeochemical pr…
View article: Carbon content, carbon fixation yield and dissolved organic carbon release from diverse marine nitrifiers
Carbon content, carbon fixation yield and dissolved organic carbon release from diverse marine nitrifiers Open
Nitrifying microorganisms, including ammonia-oxidizing archaea, ammonia-oxidizing bacteria and nitrite-oxidizing bacteria, are the most abundant chemoautotrophs in the ocean and play an important role in the global carbon cycle by fixing d…
View article: Homeostasis drives intense microbial trace metal processing on marine particles
Homeostasis drives intense microbial trace metal processing on marine particles Open
As marine microorganisms and environmental conditions coevolved over geological timescales, metals have been incorporated into all essential metabolic processes. In the modern ocean, metals are present from trace amounts limiting microbial…
View article: Ammonia-oxidizing archaea possess a wide range of cellular ammonia affinities
Ammonia-oxidizing archaea possess a wide range of cellular ammonia affinities Open
Nitrification, the oxidation of ammonia to nitrate, is an essential process in the biogeochemical nitrogen cycle. The first step of nitrification, ammonia oxidation, is performed by three, often co-occurring guilds of chemolithoautotrophs:…
View article: Limited accessibility of nitrogen supplied as amino acids, amides, and amines as energy sources for marine <i>Thaumarchaeota</i>
Limited accessibility of nitrogen supplied as amino acids, amides, and amines as energy sources for marine <i>Thaumarchaeota</i> Open
SUMMARY Genomic and physiological evidence from some strains of ammonia-oxidizing Thaumarchaeota demonstrate their additional ability to oxidize nitrogen (N) supplied as urea or cyanate, fueling conjecture about their ability to conserve e…
View article: Ammonia-oxidizing archaea possess a wide range of cellular ammonia affinities
Ammonia-oxidizing archaea possess a wide range of cellular ammonia affinities Open
Nitrification, the oxidation of ammonia to nitrate, is an essential process in the biogeochemical nitrogen cycle. The first step of nitrification, ammonia oxidation, is performed by three, often co- occurring guilds of chemolithoautotrophs…
View article: Metabolic versatility of the nitrite-oxidizing bacterium <i>Nitrospira marina</i> and its proteomic response to oxygen-limited conditions
Metabolic versatility of the nitrite-oxidizing bacterium <i>Nitrospira marina</i> and its proteomic response to oxygen-limited conditions Open
The genus Nitrospira is the most widespread group of nitrite-oxidizing bacteria and thrives in diverse natural and engineered ecosystems. Nitrospira marina Nb-295T was isolated from the ocean over 30 years ago; however, its genome has not …
View article: Microbial Processing of Jellyfish Detritus in the Ocean
Microbial Processing of Jellyfish Detritus in the Ocean Open
When jellyfish blooms decay, sinking jellyfish detrital organic matter (jelly-OM), rich in proteins and characterized by a low C:N ratio, becomes a significant source of OM for marine microorganisms. Yet, the key players and the process of…
View article: Nitrogen Isotope Fractionation During Archaeal Ammonia Oxidation: Coupled Estimates From Measurements of Residual Ammonium and Accumulated Nitrite
Nitrogen Isotope Fractionation During Archaeal Ammonia Oxidation: Coupled Estimates From Measurements of Residual Ammonium and Accumulated Nitrite Open
The naturally occurring nitrogen (N) isotopes, 15N and 14N, exhibit different reaction rates during many microbial N transformation processes, which results in N isotope fractionation. Such isotope effects are critical parameters for inter…
View article: Genome wide transcriptomic analysis of the soil ammonia oxidizing archaeon <i>Nitrososphaera viennensis</i> upon exposure to copper limitation
Genome wide transcriptomic analysis of the soil ammonia oxidizing archaeon <i>Nitrososphaera viennensis</i> upon exposure to copper limitation Open
Ammonia-oxidizing archaea (AOA) are widespread in nature and are involved in nitrification, an essential process in the global nitrogen cycle. The enzymes for ammonia oxidation and electron transport rely heavily on copper (Cu), which can …
View article: Metabolic versatility of the nitrite-oxidizing bacterium <i>Nitrospira marina</i> and its proteomic response to oxygen-limited conditions
Metabolic versatility of the nitrite-oxidizing bacterium <i>Nitrospira marina</i> and its proteomic response to oxygen-limited conditions Open
The genus Nitrospira is the most widespread group of chemolithoautotrophic nitrite-oxidizing bacteria that thrive in diverse natural and engineered ecosystems. Nitrospira marina Nb-295 T represents the type genus and was isolated from the …
View article: Niche Differentiation of Aerobic and Anaerobic Ammonia Oxidizers in a High Latitude Deep Oxygen Minimum Zone
Niche Differentiation of Aerobic and Anaerobic Ammonia Oxidizers in a High Latitude Deep Oxygen Minimum Zone Open
To elucidate the potential for nitrification and denitrification processes in a high latitude deep oxygen minimum zone (OMZ) we determined the abundance and community composition of the main microbial players in the aerobic and anaerobic (…