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544 results for “ammonium”
Alaskan Peatland Experiment (APEX): Ammonium Uptake Experiment I - Uptake Data Collected in 2016 at Lowland Bog Sites in the Bonanza Creek Experimental Forest near Fairbanks, Alaska
This dataset contains data from an ammonium uptake experiment conducted at the APEX Beta site in the BCEF. Data includes ammonium uptake of Carex aquatilis roots from porewater spiked with (NH4)2SO4 for 4 and 8 hours after excavation from thermokarst bogs. Comparisons involve deep vs shallow roots and roots excavated from the edge and centre of thermokarst bogs.
Alaskan Peatland Experiment (APEX): Ammonium Uptake Experiment II - Size Characteristics of Carex aquatilis Plants Harvested in 2016 from Thermokast Features Located in the Bonanza Creek Experimental Forest near Fairbanks, Alaska
This dataset contains data from an ammonium uptake experiment conducted at the APEX Beta site in the BCEF. Data includes size characteristics of Carex aquatilis plants harvested from the edge and centre of thermokarst features.
Soil ammonium: Long-Term Nitrogen Deposition: Population, Community, and Ecosystem Consequences
The purpose of this experiment is to measure how adding nitrogen over a long time will affect the number of species, the type of species present, the amount of annual growth, and the change from year to year in the growth of each species in a plant community which is also relieved of grazing by large and small mammals. The experiment is being conducted within fields (A, B, C, and D) which were initially low in soil nutrients. There are 8 different levels of nitrogen addition with other nutrients added to ensure that nitrogen remains the limiting nutrient, and a control which receives no nutrients. There are 6 replicates of the 9 treatments in fields A, B, and C and 5 replicates in field D. The treatments were randomly assigned to the plots. In fields A, B, and C the plots are in 6 by 9 grids and are 4 by 4 meters in size with 1 meter aisles between plots. In field D the plots are 1.5 by 4 meters and are placed in a 3 by 17 grid. The plots are enclosed by a fence to keep out mammalian herbivores. Gophers are trapped and removed as they appear. Nitrogenfertilizer (NH4NO3) is applied twice per year, once in early May and once in late June. This experiment was begun in 1982 by David Tilman.
Ammonium desorption of hyporheic sediments from Von Guerard Stream, McMurdo Dry Valleys, Antarctica (January 2019)
This data package provides analytic results for a laboratory assay on sediment samples collected in January 2019 from a transect (“P2”) across Von Guerard Stream (as described by Heindel et al. 2021), located in Taylor Valley, McMurdo Dry Valleys, Antarctica. We used excess sample from that study in a laboratory desorption assay to assess conductivity dependent desorption of ammonium. The assay was performed by mixing samples with potassium chloride treatment solutions that replicate the range of specific conductivities observed in Von Guerard Stream, shaking and centrifuging slurries, and analyzing filtered supernatant.
Free and exchangeable ammonium in sediments of the Parker River estuary
Comparison of NH4+ freely available in sediment porewater to NH4+ exchangeable from sediments, and the variabilty with porewater salinity as it changes with season and along a transect of the Parker River estuary.
Sediment oxygen, di-nitrogen (gas), nitrate, nitrite, ammonium, phosphate, and silicate flux from sealed, whole sediment core incubations from a fertilized (Sweeney) and reference (West) creek in the Plum Island Estuary, Massachusetts.
Salt marsh ecosystems serve as critical nutrient filters by removing reactive nitrogen (N) through denitrification. We examined the influence of long-term fertilization on N transformation and removal in a salt marsh tidal creek ecosystem fringing the Plum Island Sound estuary in northern Massachusetts, USA. Sediment oxygen demand was within the range of other marsh systems (1271.9 to 7855.0 µmol m-2 h-1) and was not significantly different between the fertilized and reference creek. Net N2 fluxes ranged from net N fixation of -402.7 µmol N2-N m-2 h-1 in the reference creek to net denitrification of 524.9 µmol N2-N m-2 h-1 in the fertilized creek. Net N2 flux and nitrate uptake were significantly higher in the fertilized creek, and in both creeks, net denitrification appeared to be nitrate limited. We calculated rates of dissimilatory nitrate reduction to ammonium (DNRA) and found it to be significantly higher in the fertilized creek, representing 45 and 11% of the total nitrate uptake in the fertilized and reference creeks, respectively. Additionally, there was a strong relationship between ammonium and nitrite fluxes in both creeks. These results suggest that DNRA may outcompete denitrification at high nitrate concentrations. Increased anthropogenic nutrient loading may therefore have a detrimental effect on the N removal capacity of salt marsh ecosystems. (From: Vieillard and Fulweiler (2012) Marine Ecology Progress Series 147: 11-22. DOI:10.3354/meps10013).
Water column nitrate and ammonium concentrations, sediment oxygen, di-nitrogen (gas), nitrate, nitrite, ammonium, phosphate, and silicate flux from sealed, whole core incubations, Rowley River, Rowley, MA.
Tidal flats are critical components of coastal estuarine ecosystems characterized by high rates of benthic primary productivity and biogeochemical cycling. In order to investigate the impact of anthropogenic nutrient loading on tidal flat biogeochemistry we carried out a two-week fertilization experiment. Throughout the course of the study we conducted two light-dark, whole-core incubations and took measurements of three indicators of microphytobenthos activity in addition to quantifying the resident eastern mud snail (Ilyanassa obsoleta) population.
SBC LTER : REEF: Ammonium excretion rates of macroinvertebrates
Consumers may be important mediators of nutrient cycling in giant kelp forests. To aid in this assessment, we measured the ammonium excretion rates of 17 species of macroinvertebrates which comprise 85-97% of the biomass among reefs surveyed by the LTER in the Santa Barbara Channel. We paired these species-specific data with time series of their standing biomass to assess their contributions to kelp forest nitrogen recycling and to examine patterns in their nutrient dynamics over annual and decadal scales. This is the data package supporting the article “Peters, JR, Reed, DC, Burkepile, DE. Climate and fishing drive regime shifts in consumer‐mediated nutrient cycling in kelp forests. Glob Change Biol. 2019; 25: 3179– 3192. https://doi.org/10.1111/gcb.14706”.
Oxygen Isotope Fractionation by Anaerobic Ammonium-Oxidizing Bacteria
<p>Isotope composition of nitrite, nitrate, and water, as well as concentrations of nitrite, nitrate, and ammonium, were measured during the experiments with enrichment cultures of the anammox bacterium <em>Kuenenia stuttgartiensis. </em>Samples were collected sequentially during the course of the anammox activity until the complete consumption of nitrite.<em> </em>Isotope composition of nitrite and water was measured during the abiotic experiments to follow the abiotic oxygen isotope exchange between nitrite and water. The exchange was followed over the time period of 48 h.</p>
Ammonium concentrations in surface seawater profiles in the Southern Ocean collected on board the R/V Akademik Tryoshnikov during the austral summer of 2016/2017 as part of the Antarctic Circumnavigation Expedition (ACE).
<p><strong>Dataset abstract</strong></p> <p>Seawater samples were collected from the ship's underway system or from the surface niskin bottle from the CTD rosette. Some incidental samples were collected from the surface using a bucket from the side of the ship or a zodiac. The samples were collected every 6 hours from the underway and from every CTD cast as part of the Antarctic Circumnavigation Expedition (ACE) which took place in the Austral summer of 2016/2017.</p> <p>Ammonium is representative of the recycled nitrogen pool in the upper mixed layer where inputs include marine production and terrestrial runoff. Seawater samples were collected and frozen during the expedition and analysed post-cruise and quality controlled to produce this dataset, which presents ammonium concentration in surface seawater from the Southern Ocean.</p> <p><strong>Dataset contents</strong></p> <ul> <li>ace_ammonium_concentration_surface_seawater.csv file, data file, comma-separated values</li> <li>ace_ammonium_concentration_surface_seawater_chnage_log.txt, metadata, text</li> <li>data_file_header.txt, metadata, text</li> <li>README.txt, metadata, text</li> </ul> <p><strong>Change log</strong></p> <p><strong>v1.1</strong> - Added detection limit to README.txt. Data points formatted to 2 decimal places.</p> <p><strong>v1.0</strong> - Initial release of dataset</p>
Data for: Assessing above and belowground recovery from ammonium sulphate addition and wildfire in a lowland heath: mycorrhizal fungi as potential indicators.
<p>Atmospheric pollution containing soil-nitrifying ammonium sulphate ((NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>) affects semi-natural ecosystems worldwide. Long-term additions of (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> to nitrogen(N)-limited habitats, including heathlands, increase climate stress affecting recovery from wildfires. Although heathland vegetation largely depends on ericoid mycorrhizal fungi (ErM) to access soil N, we lack a detailed understanding of how prolonged exposure to (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> may alter ErM community composition and host plants' reliance on fungal partners following wildfire and affect recovery. Simulation of atmospheric pollution ((NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>) occurred bi-weekly for 5 years after a 2006 wildfire in a UK heathland. Ten years after treatments ceased, we measured vegetation structure, lichen and lichen photobiont composition, soil characteristics, ErM colonisation, ErM diversity in roots and soil, and assessed ErM potential as novel recovery indicators. Heather height and density, and <a>moss </a>groundcover, were greater in N-enriched plots. Lichen community indices showed significant treatment effects but without differences in photobionts. Soil pH and Mg were significantly lower in treated plots while soil cation exchange capacity was significantly higher. There were no detectable differences in ErM composition and keystone ErM taxa between control and treated plots. Soil carbon stock measures were variable. Our results indicate atmospheric pollution following fire can have significant lingering effects above- and belowground. ErM diversity and root colonization were not assessed in the original N-addition experiment; we advocate for their inclusion in future studies as an integral part of the recovery assessment toolkit. We show that mycorrhizal fungi diversity is a viable ecological tool and summarise key steps for ErM identification.</p>
Data from: Polymerization of renewable itaconic acid in deep eutectic monomers: Effect of the quaternary ammonium cation structure
<p>The upload contains data associated with the publication, including raw data in the original file format whenever possible. Dataset content: NMR, rheology, UVVIS, FTIR, real time photo-FTIR as well as physicochemical properties of the investigated systems.</p> <p>This work was financially supported by the Lead Agency bilateral a Czech-Polish project provided by the Czech Science Foundation (21-07004K) and National Science Center Poland (CEUS-UNISONO project grant no. 2020/02/Y/ST5/00021).</p>
Table 2 in Description of Epistylis camprubii n. sp., a Species Highly Tolerant to Ammonium and Nitrite
<p><b>Table 2.</b> Minimum (Min) and maximum values (Max) of the main physicochemical parameters in which <i>Epistylis camprubii</i> was observed, and comparison with available ecological data of other <i>Epistylis</i> species.</p><table><tbody><tr><th></th><th><i>Epistylis camprubii</i></th><th><i>E. chrysemydis</i></th><th><i>E. coronata</i></th><th><i>E. hentscheli</i></th><th><i>E. plicatilis</i></th><th><i>E. rotans / E. procumbens</i></th></tr></tbody><tbody><tr><th></th><td>Min–Max</td><td>Min–Max</td><td>Min–Max</td><td>Min–Max</td><td>Min–Max</td><td>Min–Max</td></tr><tr><th>Soluble Chemical Oxygen Demand (mg·L–1)</th><td>53.8–415.3</td><td>–</td><td>–</td><td>–</td><td>–</td><td>–</td></tr><tr><th>Ammonium (N-NH +, mg·L–1) 4</th><td>0.54–491</td><td>2.1 <b>–</b> 5.9</td><td>0 <b>–</b> 1.6</td><td>0 <b>–</b> 1.9</td><td>0 <b>–</b> 27</td><td>0 <b>–</b> 0.018</td></tr><tr><th>Free ammonia (N-NH, mg·L–1) 3</th><td>0.024–18.01</td><td>–</td><td>–</td><td>–</td><td>–</td><td>–</td></tr><tr><th>Nitrites (N-NO –, mg·L–1) 2</th><td>0–572.1</td><td>0.1 <b>–</b> 0.8</td><td>–</td><td>–</td><td>0 <b>–</b> 61</td><td>–</td></tr><tr><th>Free nitrous acid (N-HNO, mg·L–1) 2</th><td>0.00013–0.47</td><td>–</td><td>–</td><td>–</td><td>–</td><td>–</td></tr><tr><th>Nitrates (N-NO –, mg·L–1) 3</th><td>0–321</td><td>1.5 <b>–</b> 4.2</td><td>–</td><td>–</td><td>0.14 <b>–</b> 52</td><td>–</td></tr><tr><th>Temperature (°C)</th><td>22.6–33.6</td><td>10 <b>–</b> 35</td><td>2 <b>–</b> 12</td><td>2 <b>–</b> 32</td><td>6.6 <b>–</b> 32</td><td>6 <b>–</b> 23</td></tr><tr><th>pH</th><td>6.3–8.66</td><td>7.0 <b>–</b> 8.6</td><td>7.2 <b>–</b> 7.6</td><td>7.0 <b>–</b> 8.6</td><td>4.7 <b>–</b> 8.5</td><td>7.2 <b>–</b> 7.8</td></tr></tbody></table>
Table 1 in Description of Epistylis camprubii n. sp., a Species Highly Tolerant to Ammonium and Nitrite
<p><b>Table 1.</b> Mean, standard deviation (SD), maximum values (Max), minimum values (Min), coefficient of variation (CV) and number of measurements realized (N) of morphological characteristics of <i>Epistylis camprubii</i>.</p><table><tbody><tr><th></th><th>Mean</th><th>SD</th><th>Max</th><th>Min</th><th>CV</th><th>N</th></tr></tbody><tbody><tr><th>Zooid length, <i>in vivo</i> (µm)</th><td>58.7</td><td>10.1</td><td>98.1</td><td>35.3</td><td>17.2</td><td>343</td></tr><tr><th>Zooid width, <i>in vivo</i> (µm)</th><td>32.0</td><td>5.4</td><td>65.2</td><td>18.0</td><td>16.8</td><td>342</td></tr><tr><th>Peristomial disc diameter, <i>in vivo</i> (µm)</th><td>15.5</td><td>1.9</td><td>21.3</td><td>11.2</td><td>12.1</td><td>94</td></tr><tr><th>Peristomial lip height, <i>in vivo</i> (µm)</th><td>7.8</td><td>1.2</td><td>10.6</td><td>5.0</td><td>15.9</td><td>149</td></tr><tr><th>Peristomial lip width, <i>in vivo</i> (µm)</th><td>24.2</td><td>2.9</td><td>31.7</td><td>16.2</td><td>11.8</td><td>110</td></tr><tr><th>Stalk width, <i>in vivo</i> (µm)</th><td>5.3</td><td>0.9</td><td>8.4</td><td>3.1</td><td>16.9</td><td>152</td></tr><tr><th>Number of silverlines from peristome to aboral trochal band</th><td>120.8</td><td>10.1</td><td>136.0</td><td>106.0</td><td>8.4</td><td>11</td></tr><tr><th>Number of silverlines from aboral trochal band to scopula</th><td>40.7</td><td>5.1</td><td>48.0</td><td>33.0</td><td>12.5</td><td>11</td></tr><tr><th>Macronucleous characteristics</th><td>C-shaped, transversely oriented, in the adoral half of the cell</td><td></td><td></td></tr><tr><th>Number of contractile vacuoles, position</th><td>One, in the adoral third of the body, on dorsal wall of vestibulum</td><td></td></tr></tbody></table>
Hydrogen-bonded xanthones as potential UV absorbers. The synthesis of xanthones from bio-renewable cardanol utilizing a ceric ammonium sulfate (CAS) mediated oxidation reaction
<p>The synthesis of hydrogen-bonded xanthones using the bio-renewable phenol, cardanol is described. Cardanol was initially converted into hydroxy-benzophenones. These benzophenones were converted into xanthones utilizing an oxidative ceric ammonium sulfate (CAS) mediated reaction. Subsequent ruthenium-mediated late-stage oxidation of the xanthones provided hydrogen-bonded xanthones, which displayed good UVA and UVB absorbing properties.</p>
Effect of different feeding substrates on the production of in-sect-derived frass fertilizers for effective alleviation of ammonium (NH4+) toxicity - Raw Data and Supplementary Materials
<p>Raw data and Supplementary Materials for the submitted Article Titled: "Effect of different feeding substrates on the production of in-sect-derived frass fertilizers for effective alleviation of ammonium (NH4+) toxicity". Submitted to Agronomy-Basel MDPI. </p>
Raw experimental data for hydrated arsenic(III)-oxide intercalation compound with ammonium chloride including raw diffraction data for CSD 2202825
<p>pg171_WW4_NH4ClAs2O3H2O.7z: raw diffraction data for CSD 2202825</p> <p>PXRD.7z: raw powder X-ray diffraction pattern for a sample containing intercalate <strong>Y<sub>NH<sub>4</sub>Cl</sub></strong> and its dehydrated counterpart</p> <p>WW9_TG-MS_DSC.7z: raw TG-MS and DSC data for intercalate <strong>Y<sub>NH<sub>4</sub>Cl</sub></strong></p> <p>15NssNMR.7z: raw ssNMR data for intercalates <strong>Y<sub>NH<sub>4</sub>Cl</sub></strong>, <strong>P<sub>NH<sub>4</sub>Br</sub></strong> and P<strong><sub>NH<sub>4</sub>I</sub></strong></p> <p> </p>
Supporting Information for the article "Synthesis and Antibacterial Activity of Polymerizable Acryloyloxyalkyltriethyl Ammonium Salts", published in ChemPlusChem 2017, 82(10), 1235-1244.
<p>Supporting Information for the article "Synthesis and Antibacterial Activity of Polymerizable Acryloyloxyalkyltriethyl Ammonium Salts", published in ChemPlusChem 2017, 82(10), 1235-1244 (DOI: 10.1002/cplu.201700194).</p> <p>The file is available free of charge at the publisher's website at the following URL: http://onlinelibrary.wiley.com/store/10.1002/cplu.201700194/asset/supinfo/cplu201700194-sup-0001-misc_information.pdf?v=1&s=3935a62996b49f0a39ddac08c0d37928db2dc817</p> <p>The file contains the characterization data and the copy of 1H and 13C NMR Spectra for all product synthesized in the paper published in ChemPlusChem 2017, 82(10), 1235-1244 (DOI: 10.1002/cplu.201700194).</p> <p> </p>
Effects of nitrate and ammonium on assimilation of nitric oxide by Heterosigma akashiwo
<p>This data set includes 15-NO uptake rates, gene expression of NR, GOGAT and GS, and nitrate reductase activity for the raphidophyte <em>Heterosigma akashiwo</em>.</p> <p>For details, see Healey, E.M., Flood, S., Bock, P.K., Fulwieler, R.W., York, J.K. and Coyne, K.J. (2023) Effects of nitrate and ammonium on assimilation of nitric oxide by <em>Heterosigma akashiwo</em>. <em>Sci Rep</em> 13, 621. DOI: 10.1038/s41598-023-27692-3. </p> <p><strong>Funding source</strong>: US National Oceanic and Atmospheric Association (NOAA) National Centers for Coastal Ocean Science (NCCOS) grant number <span>NA18NOS4780165; ECOHAB 2017: The role of nitric oxide in promoting Heterosigma blooms.</span></p>
Nitrogen in the Orgueil meteorite: abundant ammonium among other reservoirs of variable isotopic compositions
<p>These data are relative to the paper</p> <p>"Nitrogen in the Orgueil meteorite: abundant ammonium among other reservoirs of variable isotopic compositions"</p> <p>The dataset consists in 20 Excel files that represent the data presented in the Figures and Tables of this paper.</p> <p>Note:</p> <ul> <li>Data from Table S5 of the paper were obtained from the data shown in Table S1, whose data file is provided here</li> <li>Data from Table S6 of the paper were obtained from the data shown in Figure S5, whose data file is provided here</li> </ul>
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