Nathaniel E. Ostrom
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View article: Isotopic Fractionation and Kinetic Isotope Effects of a Purified Bacterial Nitric Oxide Reductase (NOR)
Isotopic Fractionation and Kinetic Isotope Effects of a Purified Bacterial Nitric Oxide Reductase (NOR) Open
Nitrous oxide (N2O) is a serious concern due to its role in global warming and ozone destruction. Agricultural practices account for ∼80% of all anthropogenic N2O produced in the US, due in large part to the stimulation of microbial denitr…
View article: Position-specific kinetic isotope effects for nitrous oxide: a new expansion of the Rayleigh model
Position-specific kinetic isotope effects for nitrous oxide: a new expansion of the Rayleigh model Open
Nitrous oxide (N2O) is a potent greenhouse gas and the most significant anthropogenic ozone-depleting substance currently being emitted. A major source of anthropogenic N2O emissions is the microbial conversion of fixed nitrogen species fr…
View article: Comment on egusphere-2024-963
Comment on egusphere-2024-963 Open
Abstract. Nitrous oxide (N2O) is a potent greenhouse gas and the most significant anthropogenic ozone-depleting substance currently being emitted. A major source of anthropogenic N2O emissions is the microbial conversion of fixed nitrogen …
View article: Comment on egusphere-2024-963
Comment on egusphere-2024-963 Open
Abstract. Nitrous oxide (N2O) is a potent greenhouse gas and the most significant anthropogenic ozone-depleting substance currently being emitted. A major source of anthropogenic N2O emissions is the microbial conversion of fixed nitrogen …
View article: Supplementary material to "Position-specific kinetic isotope effects for nitrous oxide: A new expansion of the Rayleigh model"
Supplementary material to "Position-specific kinetic isotope effects for nitrous oxide: A new expansion of the Rayleigh model" Open
bulk (seαN-bulk) can be determined by propagating the standard error for εN-bulk (seεN-bulk): - = - 1000 + 1 (S5) - = d - d - * - (S6) Equation (S6) simplifies to Eq. (S7), - = - 1000 (S7)where seεN-bulk is the standard error of the slope …
View article: Position-specific kinetic isotope effects for nitrous oxide: A new expansion of the Rayleigh model
Position-specific kinetic isotope effects for nitrous oxide: A new expansion of the Rayleigh model Open
Nitrous oxide (N2O) is a potent greenhouse gas and the most significant anthropogenic ozone-depleting substance currently being emitted. A major source of anthropogenic N2O emissions is the microbial conversion of fixed nitrogen species fr…
View article: Changes in soil pore structure generated by the root systems of maize, sorghum and switchgrass affect in situ N2O emissions and bacterial denitrification
Changes in soil pore structure generated by the root systems of maize, sorghum and switchgrass affect in situ N2O emissions and bacterial denitrification Open
Due to the heterogeneous nature of soil pore structure, processes such as nitrification and denitrification can occur simultaneously at microscopic levels, making prediction of small-scale nitrous oxide (N 2 O) emissions in the field notor…
View article: Coupled abiotic-biotic cycling of nitrous oxide in tropical peatlands
Coupled abiotic-biotic cycling of nitrous oxide in tropical peatlands Open
Atmospheric nitrous oxide (N 2 O) is a potent greenhouse gas thought to be mainly derived from microbial metabolism as part of the denitrification pathway. Here, we report that in unexplored peat soils of Central and South America, N 2 O p…
View article: Variation in Immune-Related Gene Expression Provides Evidence of Local Adaptation in Porites astreoides (Lamarck, 1816) between Inshore and Offshore Meta-Populations Inhabiting the Lower Florida Reef Tract, USA
Variation in Immune-Related Gene Expression Provides Evidence of Local Adaptation in Porites astreoides (Lamarck, 1816) between Inshore and Offshore Meta-Populations Inhabiting the Lower Florida Reef Tract, USA Open
Coral communities of the Florida Reef Tract (FRT) have changed dramatically over the past 30 years. Coral cover throughout the FRT is disproportionately distributed; >70% of total coral cover is found within the inshore patch reef zone (5 …
View article: Protocols for Assessing Transformation Rates of Nitrous Oxide in the Water Column
Protocols for Assessing Transformation Rates of Nitrous Oxide in the Water Column Open
Nitrous oxide (N 2 O) is a potent greenhouse gas and an ozone destroying substance. Yet, clear step-by-step protocols to measure N 2 O transformation rates in freshwater and marine environments are still lacking, challenging inter-comparab…
View article: Decomposing in-situ grown switchgrass roots as hotspots of microbial activity and N2O emission: the combination of dual-isotope labeling and zymography
Decomposing in-situ grown switchgrass roots as hotspots of microbial activity and N2O emission: the combination of dual-isotope labeling and zymography Open
<p>High temporal and spatial variability of nitrous oxide (N<sub>2</sub>O) emission from soils has been a challenge for the systematic prediction of global climate change. It is attributed to multiple hotspots occurring s…
View article: The influence of root decomposition on N2O fluxes and N2O microbial production pathways in soil with contrasting pore characteristics
The influence of root decomposition on N2O fluxes and N2O microbial production pathways in soil with contrasting pore characteristics Open
<p>An understanding of the drivers of hotspot/hot moments of N<sub>2</sub>O production is required to better constrain the global N<sub>2</sub>O budget and to plan the mitigation strategies. Hot spots are area…
View article: What can we learn from N <sub>2</sub> O isotope data? – Analytics, processes and modelling
What can we learn from N <sub>2</sub> O isotope data? – Analytics, processes and modelling Open
The isotopic composition of nitrous oxide (N 2 O) provides useful information for evaluating N 2 O sources and budgets. Due to the co‐occurrence of multiple N 2 O transformation pathways, it is, however, challenging to use isotopic informa…
View article: Algal-fungal symbiosis leads to photosynthetic mycelium
Algal-fungal symbiosis leads to photosynthetic mycelium Open
Mutualistic interactions between free-living algae and fungi are widespread in nature and are hypothesized to have facilitated the evolution of land plants and lichens. In all known algal-fungal mutualisms, including lichens, algal cells r…
View article: Author response: Algal-fungal symbiosis leads to photosynthetic mycelium
Author response: Algal-fungal symbiosis leads to photosynthetic mycelium Open
Article Figures and data Abstract eLife digest Introduction Results Discussion Materials and methods Data availability References Decision letter Author response Article and author information Metrics Abstract Mutualistic interactions betw…
View article: In Situ Quantification of Biological N<sub>2</sub> Production Using Naturally Occurring <sup>15</sup>N<sup>15</sup>N
In Situ Quantification of Biological N<sub>2</sub> Production Using Naturally Occurring <sup>15</sup>N<sup>15</sup>N Open
We describe an approach for determining biological N2 production in soils based on the proportions of naturally occurring 15N15N in N2. Laboratory incubation experiments reveal that biological N2 production, whether by denitrification or a…
View article: Preliminary assessment of stable nitrogen and oxygen isotopic composition of USGS51 and USGS52 nitrous oxide reference gases and perspectives on calibration needs
Preliminary assessment of stable nitrogen and oxygen isotopic composition of USGS51 and USGS52 nitrous oxide reference gases and perspectives on calibration needs Open
In this paper, 1 Tables 2 and3 should have appeared as below: TABLE 2 Interlaboratory comparison of USGS51 and USGS52 N 2 O isotopic measurements.Individual laboratory uncertainties are standard deviations of minimum of three repeated meas…
View article: Nitrous oxide from chemodenitrification: A possible missing link in the Proterozoic greenhouse and the evolution of aerobic respiration
Nitrous oxide from chemodenitrification: A possible missing link in the Proterozoic greenhouse and the evolution of aerobic respiration Open
The potent greenhouse gas nitrous oxide (N 2 O) may have been an important constituent of Earth's atmosphere during Proterozoic (~2.5–0.5 Ga). Here, we tested the hypothesis that chemodenitrification, the rapid reduction of nitric oxide by…
View article: X‐ray computed tomography to predict soil N<sub>2</sub>O production via bacterial denitrification and N<sub>2</sub>O emission in contrasting bioenergy cropping systems
X‐ray computed tomography to predict soil N<sub>2</sub>O production via bacterial denitrification and N<sub>2</sub>O emission in contrasting bioenergy cropping systems Open
While renewable biofuels can reduce negative effects of fossil fuel energy consumption, the magnitude of their benefits depends on the magnitude of N 2 O emissions. High variability of N 2 O emissions overpowers efforts to curb uncertainti…
View article: Estimation of isotope variation of N <sub>2</sub> O during denitrification by <i>Pseudomonas aureofaciens</i> and <i>Pseudomonas chlororaphis</i> : implications for N <sub>2</sub> O source apportionment
Estimation of isotope variation of N <sub>2</sub> O during denitrification by <i>Pseudomonas aureofaciens</i> and <i>Pseudomonas chlororaphis</i> : implications for N <sub>2</sub> O source apportionment Open
Soil microbial processes, stimulated by agricultural fertilization, account for 90 % of anthropogenic nitrous oxide (N2O), the leading source of ozone depletion and a potent greenhouse gas. Efforts to reduce N2O flux commonly focus on redu…
View article: Nitrogen cycling in Sandusky Bay, Lake Erie: oscillations between strong and weak export and implications for harmful algal blooms
Nitrogen cycling in Sandusky Bay, Lake Erie: oscillations between strong and weak export and implications for harmful algal blooms Open
Recent global water quality crises point to an urgent need for greater understanding of cyanobacterial harmful algal blooms (cHABs) and their drivers. Nearshore areas of Lake Erie such as Sandusky Bay may become seasonally limited by nitro…
View article: Preliminary assessment of stable nitrogen and oxygen isotopic composition of USGS51 and USGS52 nitrous oxide reference gases and perspectives on calibration needs
Preliminary assessment of stable nitrogen and oxygen isotopic composition of USGS51 and USGS52 nitrous oxide reference gases and perspectives on calibration needs Open
Rationale Despite a long history and growing interest in isotopic analyses of N 2 O, there is a lack of isotopically characterized N 2 O isotopic reference materials (standards) to enable normalization and reporting of isotope‐delta values…
View article: The nitrogen pendulum in Sandusky Bay, Lake Erie: Oscillations between strong and weak export and implications for harmful algal blooms
The nitrogen pendulum in Sandusky Bay, Lake Erie: Oscillations between strong and weak export and implications for harmful algal blooms Open
Recent global water quality crises point to an urgent need for greater understanding of cyanobacterial harmful algal blooms (cHABs) and their drivers. Nearshore areas of Lake Erie such as Sandusky Bay may become seasonally limited by nitro…
View article: Supplementary material to "Estimation of isotopologue variation of N <sub>2</sub> O during denitrification by <i>Pseudomonas aureofaciens</i> and <i>Pseudomonas</i> chlororaphis: Implications for N <sub>2</sub> O source apportionment"
Supplementary material to "Estimation of isotopologue variation of N <sub>2</sub> O during denitrification by <i>Pseudomonas aureofaciens</i> and <i>Pseudomonas</i> chlororaphis: Implications for N <sub>2</sub> O source apportionment" Open
Supplementary Table 1: Non-linear exponential models estimating the change in δ 15 N isotope values following reduction of NO3 -to N2O by two species of denitrifying bacteria across an extent of the reaction.The coefficients of each equati…