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369 results for “Permeability”
Data from: Microform-scale variations in peatland permeability and their ecohydrological implications
1. The acrotelm-catotelm model of peatland hydrological and biogeochemical processes posits that the permeability of raised bogs is largely homogenous laterally but varies strongly with depth through the soil profile; uppermost peat layers are highly permeable while deeper layers are, effectively, impermeable. 2. We measured down-core changes in peat permeability, plant macrofossil assemblages, dry bulk density and degree of humification beneath two types of characteristic peatland microform – ridges and hollows – at a raised bog in Wales. Six 14C dates were also collected for one hollow and an adjacent ridge. 3. Contrary to the acrotelm-catotelm model, we found that deeper peat can be as highly permeable as near-surface peat and that its permeability can vary by more than an order of magnitude between microforms over horizontal distances of 1-5 metres. 4. Our palaeo-ecological data paint a complicated picture of microform persistence. Some microforms can remain in the same position on a bog for millennia, growing vertically upwards as the bog grows. However, adjacent areas on the bog (< 10 m distant) show switches between microform type over time, indicating a lack of persistence. 5. Synthesis. We suggest that the acrotelm-catotelm model should be used cautiously; spatial variations in peatland permeability do not fit the simple patterns suggested by the model. To understand how peatlands as a whole function both hydrologically and ecologically it is necessary to understand how patterns of peat physical properties and peatland vegetation develop and persist.
Data from: Local predation risk and matrix permeability interact to shape movement strategy
In fragmented landscapes, the reduced connectivity among patches drives the evolution of movement strategies through an increase of transience costs. Reduced movements may further alter heterogeneity in biotic and abiotic conditions experienced by individuals. The joint action of local conditions and matrix permeability may shape emigration decisions. Here, we tested the interactive effects of predation risk and matrix permeability on movement propensity, movement costs and movers' phenotype in the common toad Bufo bufo. In a full-crossed experimental design, we assessed the movement propensity of juveniles in three connectivity treatments (from poorly to highly permeable matrix), with or without predation risk in their living patch. We also assessed the relationships between movement propensity and morphological traits (i.e. body and leg length) and how it affected the movement cost (i.e. mass loss). Movement propensity increased in presence of predation risk, while matrix permeability had no effect. However, matrix permeability interacted with predation risk to influence movers' phenotype and the physiological cost they endured while moving. In particular, a well-known movement syndrome in toads (i.e. movement propensity positively related to longer legs) depended on the interaction between matrix permeability and predation risk and resulted in differences in mass loss among matrix types. Movers lost more mass on average than residents except when they also displayed longer legs or when they crossed the most permeable matrix in the presence of predation risk. Our results show that matrix permeability shapes the physiological cost of dispersal by changing the identity of individuals moving away from local conditions. As the movers' phenotype can importantly alter (meta)population dynamics, context-dependency of dispersal syndromes should be considered in studies predicting the functioning of human-altered natural systems.
Data from: Experimental study on permeability characteristics for containing-gas raw coal under different stress conditions
The experimental study on permeability characteristics for raw coal under different stress state is implemented by applying the triaxial self-made "THM coupled with servo-controlled seepage apparatus for containing-gas coal", the result indicates: The flow rate of coal sample gradually decreases with the nonlinear loading of axial pressure and increases with the nonlinear unloading of axial stress and confining pressure. The flow rate, axial stress and confining pressure curves all satisfy the negative exponential function relation. When the sample reaches the peak intensity, the sample will be destroyed and the stress will drop rapidly, then the flow rate of the sample will increase rapidly. At this stage, the flow rate and axial strain show an oblique "v" pattern. The flow rate of coal sample increases nonlinear with the increase of gas pressure, the relation curve between flow rate and gas pressure satisfies power function relation. Under the condition of same confining pressure and gas pressure, the larger the axial stress is, the flow rate of coal sample will be smaller. Under the condition of same axial stress and gas pressure, as confining pressure decreases, the flow rate of coal sample will firstly decrease, but then increase. During the loading and unloading process post-peak, the flow rate of coal sample will decrease with the loading of confining pressure but increase with the unloading of confining pressure, and it will increase in wave shape with the increase of axial strain. The flow rate of each loading and unloading confining pressure is higher than that of the previous loading and unloading confining pressure. At the post-peak stage, the relation curve between the flow rate of coal sample and confining pressure satisfies the power function relation in the process of loading and unloading confining pressure.
Data from: Measuring CO2 and HCO3- permeabilities of isolated chloroplasts using a MIMS-18O approach
To support photosynthetic CO2 fixation by Rubisco, the chloroplast must be fed with inorganic carbon in the form of CO2 or bicarbonate. However, the mechanisms allowing the rapid passage of this gas and this charged molecule through the bounding membranes of the chloroplast envelope are not yet completely elucidated. We describe here a method allowing us to measure the permeability of these two molecules through the chloroplast envelope using a membrane inlet mass spectrometer and 18O-labelled inorganic carbon. We established that the internal stromal carbonic anhydrase activity is not limiting for this technique, and precisely measured the chloroplast surface area and permeability values for CO2 and bicarbonate. This was performed on chloroplasts from several plant species, with values ranging from 2.3 × 10–4 m s–1 to 8 × 10–4 m s–1 permeability for CO2 and 1 × 10–8 m s–1 for bicarbonate. We were able to apply our method to chloroplasts from an Arabidopsis aquaporin mutant, and this showed that CO2 permeability was reduced 50% in the mutant compared with the wild-type reference.
Gas permeability through swelling porous media: Insights from coarse-grained pore-scale simulations
<p>CGMD data for gas transport in swelling porous media</p>
Formation of Weak Slab Interface with Permeability Anisotropy and Its Role in Subduction Infancy to Mature Subduction
<p>Data files used for figures. </p>
Thin section, XRCT, permeability and MPF data
<p>Thin section, XRCT, permeability and MPF data</p>
Thin section, XRCT, permeability and MPF data for HIP
<h1>Thin section, XRCT, permeability and MPF data for HIP</h1> <div> <div> <div> </div> </div> </div>
Impact of stress regime change on the permeability of a naturally fractured carbonate buildup (Latemar, the Dolomites, northern Italy)_DATASET
<p>The datasets (original field photographs, drone images and finite-element modelling algorithms and results) presented here are drawn from the extensive fieldwork, and finite-element modelling of the impact of stress regime change on the permeability of a naturally fractured carbonate buildup (Latemar, the Dolomites, northern Italy) by the author(s). These datasets show different rock units in the Latemar platform riddled with diverse structural elements, including fractures (veins, joints, faults) and stylolites, and the results of the impact of the modelled far-field stresses at (i) subsidence deformation from the NW–SE and (ii) Alpine deformation from N–S. All of which increased the overall fracture aperture and permeability of the studied carbonate platform. </p> <p>In addition, the datasets are part of the paper titled "<strong>Impact of stress regime change on the permeability of a naturally fractured carbonate buildup (Latemar, the Dolomites, northern Italy)</strong>"<strong>, </strong>published<strong> </strong>in the Solid Earth Journal. </p> <p>The drone images are taken with DJI Phantom 4® and processed using Agisoft PhotoScan® - a photogrammetry tool. The workflow in processing the drone images is publicly available in the published work of Bisdom et al. (2017).</p>
Figure 2 from: Amosu A, Mahmood H, Ofoche P (2018) Estimating the Permeability of Carbonate Rocks from the Fractal Properties of Moldic Pores using the Kozeny-Carman Equation. Research Ideas and Outcomes 4: e24430. https://doi.org/10.3897/rio.4.e24430
Figure 2 Figure showing the application of the pigeonhole fractal model to the pore spaces in the thin-section photomicrograph.
Determining characteristic relative permeability from coreflooding experiments: A simplified model approach
<p>Simulation input and output files for generating the results in Sections 3 and 5 of the paper.</p>
Figure 2 in Comparing landscape suitability and permeability with and without migration data: the influence of species movement behavior
Figure 2. Importance of environmental variables evaluated based on jackknife analysis in the first (up) and second (down) MaxEnt model.
Nitrate trend reversal in Dutch dual-permeability chalk springs, evaluated by tritium-based groundwater travel time distributions [Data set]
<p>Data set covering measured nitrate and sulfate data of 90 springs, the tritium and nitrate input data for the convolution models and the age distributions metrics for the base case model and the stringent denitrification model, which were described in the publication in Science of the Total Environment (2024); doi: <em>10.1016/j.scitotenv.2024.175250</em></p>
Data for Cooper et al., 2023, 4D tomography reveals a complex relationship between wormhole advancement and permeability variation in dissolving rocks, Advances in Water Resources
<p>Tomography dataset associated with Cooper, et al. (2023), "4D tomography reveals a complex relationship between wormhole advancement and permeability variation in dissolving rocks" in Advances in Water Resources.</p>
Characteristics of Blood- Brain Barrier Permeability in Neurological Patients
ClinicalTrials.gov study NCT00419874. IPD Sharing: Not stated. Countries: 1. Publications: 4.
Effect of Deep TMS on the Permeability of the BBB in Patients With Glioblastoma Multiforme: a Pilot Study
ClinicalTrials.gov study NCT02474966. IPD Sharing: Not stated. Countries: 0. Publications: 15.
Effect of Oral Galactose on Focal Segmental Glomerulosclerosis (FSGS) Permeability Factor
ClinicalTrials.gov study NCT00816478. IPD Sharing: Not stated. Countries: 0. Publications: 1.
Evaluating the Ability of a Multi-Strain Postbiotic to Impact Inflammation, Immune Components, Gastrointestinal Symptoms, Recovery, Anxiety, and Intestinal Permeability
ClinicalTrials.gov study NCT07387991. IPD Sharing: NO. Countries: 1. Publications: 0.
ONES Grant: CXCL10/CXCR3 Regulation of Ozone-Induced Epithelial Permeability
ClinicalTrials.gov study NCT03599206. IPD Sharing: NO. Countries: 1. Publications: 0.
rHGH and Intestinal Permeability in Intestinal Failure
ClinicalTrials.gov study NCT01380366. IPD Sharing: Not stated. Countries: 1. Publications: 0.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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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.