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223 results for “ammonia”
Data: Green ammonia imports could supplement long-duration energy storage in the UK
<div> <p>Data used for the analysis presented in 'Green ammonia imports could supplement long-duration energy storage in the UK'. </p> <p> </p> </div>
Nucleotide sequence database of Copper-containing membrane monooxygenases genes for analysing primer pairs targeting the ammonia monooxygenase subunit A gene of complete ammonia oxidising Nitrospira
<p>Nucleotide sequences of 487 Cu-mmo genes, including amoA comammox clade A and clade B, amoA ammonia oxidizing bacteria as well as other Cu-mmo genes.</p>
Supplementary material: Hyperfine-resolved rotation-vibration line list of ammonia (NH3)
<p>Supplementary material to the manuscript: P. Coles, A. Owens, J. Küpper, A. Yachmenev, A Hyperfine-resolved Rotation-Vibration Line List of Ammonia (NH<sub>3</sub>), <em>The Astrophysical Journal</em> <strong>870</strong>, 24 (2019), DOI: <a href="http://dx.doi.org/10.3847/1538-4357/aaef7e">http://dx.doi.org/10.3847/1538-4357/aaef7e</a></p> <p>Contains two archive files</p> <ol> <li><em>efg_surface.tar </em> - contains Fortran 90 program, together with the input/output examples and README file, for computing the electric field gradient tensor of NH<sub>3</sub></li> <li><em>linelist.tar</em> - contains compressed file with the rovibrational line list of NH<sub>3</sub> with quadrupole coupling components, along with programs to extract user-desired transition data and README file</li> </ol>
Bringing the concept of ammonia critical levels into managing cork-oak woodland for conservation
<p>Agricultural activities often emit excessive nitrogen concentrations to nearby habitats, impacting ecosystems structure and functioning. To protect them, critical levels were established as the concentration above which direct adverse effects on ecosystems may arise. However, due to lack of tools, critical levels are seldom applied in management strategies for conservation. Our objective was to provide a spatial-explicit tool to incorporate the concept of ammonia critical levels in management practices of atmospheric nitrogen impacts. To do that, lichens diversity was sampled in 19 plots at a cork oak woodland (Montado), a High Nature Value Farmland where multiple agricultural activities, surrounded by high-intensity agricultural activities, coexist. We inferred and selected the best performing trait-based metrics and determined the main environmental drivers of change. The most responsive metric was the abundance of oligotrophic lichen species, which was likely responding to nitrogen incoming from nearby high-intensity agricultural areas. The low intensity agricultural activities, cattle grazing within the study area, had no effect. Using the known ammonia critical levels for that ecosystem, we modelled and mapped the long-term critical levels exceedance for the entire study area. This allowed us to signal high intensity agriculture as the source of impact and to map the areas where management practices need further attention under a conservation perspective: either decreasing fertilization in nearby fields or by considering these as buffer areas, outside the scope of conservation.</p>
Atmospheric Ammonia (NH3) total columns from the FY-4A Geostationary Interferometric Infrared Sounder (GIIRS)
<p>This dataset includes the ammonia (NH3) total columns (in molecules cm<sup>-2</sup>) obtained from the FY-4A Geostationary Interferometric Infrared Sounder (GIIRS) satellite observations between November 2019 and October 2020. It also includes a an NH3 uncertainty estimate and a cloud flag. Data has been set to NaN when clouds are detected or in the case of poor measurement sensitivity. Description of the product and retrieval method can be found in Clarisse et al. (2021).</p>
Potential contributions of ammonia-oxidizing microorganisms to the distributions of nitrous oxide in the northern Bering Sea
<ul> <li> <p>Basic GHGs data for the Bering Sea in CHINARE2016</p> </li> </ul>
Early onset of urea synthesis and ammonia detoxification pathways in three terrestrially developing frogs
<p>Frogs evolved terrestrial development multiple times, necessitating mechanisms to avoid ammonia toxicity at early stages. Urea synthesis from ammonia is a key adaptation that reduces water dependence after metamorphosis. We tested for early expression and plasticity of enzymatic mechanisms of ammonia detoxification in three terrestrial-breeding frogs: foam-nest-dwelling larvae of <em>Leptodactylus fragilis </em>(Lf) and arboreal embryos of <em>Hyalinobatrachium fleischmanni</em> (Hf) and <em>Agalychnis callidryas</em> (Ac). Activity of two ornithine-urea cycle (OUC) enzymes, arginase and CPSase 1, and levels of their products urea and CP in tissues were high in Lf regardless of nest hydration but reduced in experimental low- vs. high-ammonia environments. High OUC activity in wet and dry nests, comparable to that under experimental high ammonia, suggests terrestrial Lf larvae maintain high capacity for urea excretion regardless of their immediate risk of ammonia toxicity. This may aid survival through unpredictably long waiting periods before rain enables their transition to water. Moderate levels of urea and CP were present in Hf and Ac tissues and enzymatic activities were lower than in Lf. In both species, embryos in drying clutches can hatch and enter the water early, behaviorally avoiding ammonia toxicity. Moreover, glutamine synthetase is active in early stages of all three species, condensing ammonia and glutamate to glutamine as another mechanism of detoxification. Enzyme activity appeared highest in Lf, although substrate and product levels were higher in Ac and Lf. Our results reveal that multiple biochemical mechanisms of ammonia detoxification occur in early life stages of anuran lineages that evolved terrestrial development.</p>
Data from: Sensitivity of simulated ammonia fluxes in Rocky Mountain National Park to measurement time resolution and meteorological inputs
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Data from: Global evaluation of inhibitor impacts on ammonia and nitrous oxide emissions from agricultural soils: A meta-analysis
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Unchanged PM2.5 levels over Europe during COVID-19 were buffered by ammonia
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Early onset of urea synthesis and ammonia detoxification pathways in three terrestrially developing frogs
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Data from: Biological controls over the abundances of terrestrial ammonia oxidizers
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Data from: Branchial CO2 and ammonia excretion in crustaceans: Involvement of an apical Rhesus-like glycoprotein
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Electrochemical ammonia recovery and co-production of chemicals from manure wastewater
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Data from: Size-resolved chemical composition of sub-20 nm particles from methanesulfonic acid reactions with methylamine and ammonia
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Fernow Experimental Forest site, station Watershed 4 at Fernow Experimental Forest, study of ammonia streamwater export in units of kilogramsPerHectarePerYear on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Fernow Experimental Forest (FER) contains ammonia streamwater export measurements in kilogramsPerHectarePerYear units and were aggregated to a yearly timescale.
Rapid growth of new atmospheric particles by nitric acid and ammonia condensation: data resources
<p>Data presented in the manuscript "Rapid growth of new atmospheric particles by nitric acid and ammonia condensation" currently in review.</p> <p> </p> <p>The manuscript associated with this data was written using results from the CLOUD experiment at CERN, and the author list is a subset of the CLOUD collaboration.</p> <p> </p>
Nitrogen isotope fractionation during archaeal ammonia oxidation: coupled estimates from measurements of residual ammonium and accumulated nitrite
<p>The naturally occurring nitrogen (N) isotopes, <sup>15</sup>N and <sup>14</sup>N, exhibit different reaction rates during many microbial N transformation processes, which results in N isotope fractionation. Such isotope effects are critical parameters for interpreting natural stable isotope abundances as proxies for biological process rates in the environment across scales. The kinetic isotope effect of ammonia oxidation (AO) to nitrite (NO<sub>2</sub><sup>-</sup>), performed by ammonia-oxidizing archaea (AOA) and bacteria (AOB), is generally ascribed to the enzyme ammonia monooxygenase (AMO), which catalyzes the first step in this process. However, the kinetic isotope effect of AMO, or ε<sub><i>AMO</i></sub><span><span> </span></span>, has been typically determined based on isotope kinetics during product formation (cumulative product, NO<sub>2</sub><sup>-</sup>) alone, which may have overestimated ε<sub><i>AMO</i></sub><span><span> </span></span> due to possible accumulation of chemical intermediates and alternative sinks of ammonia/ammonium (NH<sub>3</sub>/NH<sub>4</sub><sup>+</sup>). Here, we analyzed <sup>15</sup>N isotope fractionation during archaeal ammonia oxidation based on both isotopic changes in residual substrate (RS, <span>NH<sub>4</sub><sup>+</sup></span>) and cumulative product (CP, NO<sub>2</sub><sup>-</sup>) pools in pure cultures of the soil strain <i>Nitrososphaera viennensis</i> EN76, and in highly enriched cultures of the marine strain <i>Nitrosopumilus adriaticus</i> NF5, under non-limiting substrate conditions. We obtained ε<sub><i>AMO</i></sub><span><span> </span></span> values of 31.9-33.1‰ for both strains based on RS (<span>δ<sup>15</sup>NH<sub>4</sub><sup>+</sup>), and show that </span>estimates based on CP (δ<sup>15</sup>NO<sub>2</sub><sup>-</sup>) give larger isotope fractionation factors by 6-8‰. Complementary analyses showed that, at the end of the growth period, microbial biomass was <sup>15</sup>N-enriched<span> (10.1</span>‰),<span> whereas </span>nitrous oxide (N<sub>2</sub>O) was highly <sup>15</sup>N depleted (-38.1‰) relative to the initial substrate. Although we did not determine the isotope effect of <span>NH<sub>4</sub><sup>+</sup> </span>assimilation (biomass formation) and N<sub>2</sub>O production by AOA, our results nevertheless show that the discrepancy between ε<sub><i>AMO</i></sub><span><span> </span></span> estimates based on RS and CP might have derived from incorporation of <sup>15</sup>N-enriched residual NH<sub>4</sub><sup>+</sup> after AMO reaction into microbial biomass, and that N<sub>2</sub>O production did not affect isotope fractionation estimates significantly.</p>
Data from: Bioturbation determines the response of benthic ammonia oxidising microorganisms to ocean acidification
Ocean acidification (OA), caused by the dissolution of increasing concentrations of atmospheric carbon dioxide (CO2) in seawater, is projected to cause significant changes to marine ecology and biogeochemistry. Potential impacts on the microbially driven cycling of nitrogen are of particular concern. Specifically, under seawater pH levels approximating future OA scenarios, rates of ammonia oxidation (the rate-limiting first step of the nitrification pathway) have been shown to dramatically decrease in seawater, but not in underlying sediments. However, no prior study has considered the interactive effects of microbial ammonia oxidation and macrofaunal bioturbation activity, which can enhance nitrogen transformation rates. Using experimental mesocosms, we investigated the responses to OA of ammonia oxidizing microorganisms inhabiting surface sediments and sediments within burrow walls of the mud shrimp Upogebia deltaura. Seawater was acidified to one of four target pH values (pHT 7.90, 7.70, 7.35 and 6.80) in comparison with a control (pHT 8.10). At pHT 8.10, ammonia oxidation rates in burrow wall sediments were, on average, fivefold greater than in surface sediments. However, at all acidified pH values (pH ≤ 7.90), ammonia oxidation rates in burrow sediments were significantly inhibited (by 79–97%; p < 0.01), whereas rates in surface sediments were unaffected. Both bacterial and archaeal abundances increased significantly as pHT declined; by contrast, relative abundances of bacterial and archaeal ammonia oxidation (amoA) genes did not vary. This research suggests that OA could cause substantial reductions in total benthic ammonia oxidation rates in coastal bioturbated sediments, leading to corresponding changes in coupled nitrogen cycling between the benthic and pelagic realms.
Data from: Exotic invasive plants increase productivity, abundance of ammonia-oxidizing bacteria, and nitrogen availability in intermountain grasslands
1. Exotic plant invasion is often associated with dramatic increases in above-ground net primary productivity and soil nitrogen. However, most evidence for these increases comes from correlative studies of single species, leaving open the question of whether invasive plants drive these processes and if they are consistent among invaders. 2. We combined field surveys and measurements within experimental plantings to examine how plant productivity, soil nitrogen, and the abundance of ammonia-oxidizing bacteria (AOB) change in response to invasions by four exotic species. 3. The relationship between plant productivity and soil nitrate differed among native and invasive species, suggesting a fundamental disparity in the effects of natives and invaders on ecosystem processes. In field surveys, dense patches of all invasive species had higher abundances of AOB than native-dominated sites. Three of the four invasive species had higher productivity, soil nitrate concentrations, and rates of potential nitrification as compared to nearby native-dominated communities. In our experimental plantings we found that two invasive species drove increases in soil nitrate and one invader caused increased productivity after a single season. 4. Synthesis:Our results highlight the importance of the N-cycling soil microbial community in how exotic invasive plants alter ecosystem function and show that shifts in function can occur rapidly.
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Allen Brain Atlas
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.