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51 results for “porewater”
Porewater nutrient concentrations from control plots in a Spartina alterniflora-dominated salt marsh at Goat Island, North Inlet, Georgetown, SC.
Porewater samples from a Spartina alterniflora-dominated salt marsh on Goat Island, North Inlet, Georgetown, SC were analyzed for ammonium, phosphate, sulfide and chloride concentrations.
Sediment porewater nutrients, sulfide, pH, and alkalinity in the Parker and Rowley River, Massachusetts
Measurements of sediment porewater nutrient, sulfide, pH, and alkalinity, 1993 -2004, at a variety of sites and salinities throughout the Plum Island Sound estuary.
Alpha: A Fortran program for simulating porewater radiolysis
<p>The radiolysis of porewaters by uranium, thorium, and potassium in mineral grains is a recognised source of molecular hydrogen in rock- and sediment-hosted fluids. This radiolytic hydrogen is of geomicrobiological interest as a potential energy source (electron donor) for microbial metabolism, especially in energy-limited settings such as the marine deep biosphere or the subsurface of Mars. Previous efforts to predict the production of radiolytic hydrogen from columns of rock and sediment have tended to rely upon analytic models that cannot account for the attenuation of mineral radiation by grains larger than ~30 microns. To address this, we have developed a Monte Carlo method to simulate the physics of mineral radiation and evaluate the production of H<sub>2</sub> as a function of mineral grain size and radioisotope composition. The results confirm that grain size is a major control on radiolytic H<sub>2</sub> yield. For example, using the standard geological classification of grain sizes, we find that clay can produce up to an order of magnitude more H<sub>2</sub> per unit time than sand. The magnitude of this effect is illustrated using compositional data from real geological units in order to demonstrate the dependence of radiolytic hydrogen flux on natural radionuclide concentration and bulk porosity.</p>
Potential Methane Production and Oxidation Rates and Porewater Chemistry Across Peatland Hummocks and Lawns
<p>This dataset contains potential methane (CH<sub>4</sub>) production and oxidation rates and porewater chemistry (dissolved oxygen, pH, redox potential, dissolved CH<sub>4</sub>, and CH<sub>4</sub> stable isotopes) measurements collected from hummocks and lawns in a poor fen in New Hampshire, USA. Potential CH<sub>4</sub> production and oxidation rates determined via incubations and dissolved oxygen measurements were collected in July 2018. Porewater CH<sub>4</sub> concentration, δ<sup>13</sup>C-CH<sub>4</sub> and δD-CH<sub>3</sub>D, and Eh/pH were collected in July/August 2020. The data file contains a "README" tab with a guide for variable units and descriptions. </p>
Alpha: A Fortran program for simulating porewater radiolysis
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Figure data and analysis for: The effect of grain size on porewater radiolysis
<p>The radiolysis of porewaters by uranium, thorium, and potassium in mineral grains is a recognised source of molecular hydrogen in rock- and sediment-hosted fluids. This radiolytic hydrogen is of geomicrobiological interest as a potential energy source (electron donor) for microbial metabolism, especially in energy-limited settings such as the marine deep biosphere or the subsurface of Mars. Previous efforts to predict the production of radiolytic hydrogen from columns of rock and sediment have tended to rely upon analytic models that cannot account for the attenuation of mineral radiation by grains larger than ~30 microns. To address this, we have developed a Monte Carlo method to simulate the physics of mineral radiation and evaluate the production of H<sub>2</sub> as a function of mineral grain size and radioisotope composition. The results confirm that grain size is a major control on radiolytic H<sub>2</sub> yield. For example, using the standard geological classification of grain sizes, we find that clay can produce up to an order of magnitude more H<sub>2</sub> per unit time than sand. The magnitude of this effect is illustrated using compositional data from real geological units in order to demonstrate the dependence of radiolytic hydrogen flux on natural radionuclide concentration and bulk porosity.</p>
Efficient oxidation attenuates porewater-derived methane fluxes in mangrove waters
<p>Data set used in the publication (<a href="https://doi.org/10.1002/lno.12639">https://doi.org/10.1002/lno.12639)</a></p> <ul> <li>timerseries.xlsx <ul> <li>This data includes continous data of ch4 concentration with other environmental parameters e.g. salinity, temperature, water depth, oxygen saturation and calculated water-air ch4 fluxes at two mangrove creeks in southeastern Brazil (Paraty-Mirim National Park, Florianópolis) </li> </ul> </li> <li>discrete data <ul> <li>This data includes discrete surface water sampling during spring and neap tide and porewater. The data includes ch4 concentration, d13C-CH4 and environmental parameters. </li> </ul> </li> </ul>
Regional wetland plant responses to sulfur and other porewater chemistry in calcareous rich fens
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Figure data and analysis for: The effect of grain size on porewater radiolysis
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Data from: The effects of river algae and porewater flow on the feeding of juvenile mussels
<p class="Abstract">Juvenile mussels enter the benthos after excysting from a fish host and settling to the bottom where they inhabit the interstitial zone in rivers. We examined the algal composition in the surface water and pore waters in different locations in a temperate river (Thames River) in Southern Ontario. Surprisingly, algal concentration (<i>C</i>) was ~9× higher in pore water versus surface water, varied spatially in the riverbed (downstream of boulders > upstream of boulders and non-bedform regions), and pennate diatoms were the most abundant taxon in the pore waters. We examined the clearance rate (<i>CR</i>; mass of suspended material removed from the water per unit time and mussel) of recently metamorphosed juvenile unionid mussels (3 – 4 week old <i>Lampsilis siliquoidea,</i> Fatmuckets) exposed to pore water and surface water in a paddle-wheel flow chamber at different water velocities (<i>U</i>). Juvenile <i>CR</i> based on chlorophyll <i>a</i> fluorescence was ~2× higher on pore water versus surface water and <i>CR</i> based on a specific algal taxon, identified via flow cytometry, varied with its initial concentration. Chesson's feeding electivity index revealed that mussels removed 5 chlorophyte taxa in proportion to their concentration in the water (i.e., removed at random) but they removed 5 diatom taxa in greater proportion (i.e., selected for by juvenile mussels) across the range of algal flux (<i>J</i> = <i>UC</i>) examined. This study provides evidence of the importance of diatoms in pore waters to juvenile mussels. It also reveals elements of the physico-chemical environment used by juvenile mussels, which should be considered in their conservation.</p>
Data from: The effects of river algae and porewater flow on the feeding of juvenile mussels
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
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.