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447 results for “Potassium”
Soil potassium: Herbivory by Nitrogen Interactive Effects on Community and Ecosystem Processes and Dynamics
E172 is an herbivory experiment established by Dave Tilman in fall 2004 by enclosing in deer fences three randomly selected plots from the six replicates of each control and each treatment in the N addition E001 experiment in field C. These plots still receive the nutrient treatments prescribed in the Experiment 001 protocols. From 1982-2004 a fence containing all of e001 plots in Field C was designed to exclude deer and all small mammals, including mice, voles and pocket gophers. This fence was removed in Fall of 2004 and individual plots designated for e172 were enclosed in deer fences. The purpose of E001 was to measure how adding nitrogen over a long time would 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. 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. The plots are in a 6 by 9 grid and are 4 by 4 meters in size with 1 meter aisles between plots. Nitrogen fertilizer (NH4NO3) is applied twice per year, once in early May and once in late June.
Enhanced polarization in epitaxially strained monoclinic potassium niobate for lead-free electromechanical applications
<p>Atomic structure files used to study the anisotropic structural index for ferroelectric properties of strained KNbO3 perovskite polymorphs.</p>
Data from: Limitation of seedling growth by potassium and magnesium supply for two ectomycorrhizal tree species of a Central African rain forest and its implication for their recruitment
In the ectomycorrhizal caesalpiniaceous groves of southern Korup National Park, the dominant tree species, Microberlinia bisulcata, displays very poor in situ recruitment compared with its codominant, Tetraberlinia bifoliolata. The reported ex situ experiment tested whether availabilities of soil potassium and magnesium play a role. Seedlings of the two species received applications of K and Mg fertilizer in potted native soil in a local shade house, and their responses in terms of growth and nutrient concentrations were recorded over 2 years. Amended soil concentrations were also determined. Microberlinia responded strongly and positively in its growth to Mg, but less to K; Tetraberlinia responded weakly to both. Added Mg led to strongly increased Mg concentration for Microberlinia while added K changed that concentration only slightly; Tetraberlinia strongly increased its concentration of K with added K, but only somewhat its Mg concentration with added Mg. Additions of Mg and K had small but important antagonistic effects. Microberlinia is Mg-demanding and apparently Mg-limited in Korup soil; Tetraberlinia, whilst K-demanding, appeared not to be K-limited (for growth). Added K enhanced plant P concentrations of both species. Extra applied Mg may also be alleviating soil aluminum toxicity, and hence improving growth indirectly and especially to the benefit of Microberlinia. Mg appears to be essential for Microberlinia seedling growth and its low soil availability in grove soils at Korup may be an important contributing factor to its poor recruitment. Microberlinia is highly shade-intolerant and strongly light-responding, whilst Tetraberlinia is more shade-tolerant and moderately light-responding, which affords an interesting contrast with respect to their differing responses to Mg supply. The study revealed novel aspects of functional traits and likely niche-partitioning among ectomycorrhizal caesalps in African rain forests. Identifying the direct and interacting indirect effects of essential elements on tropical tree seedling growth presents a considerable challenge due the complex nexus of causes involved.
Data from: Deconstruction of an African folk medicine uncovers a novel molecular strategy for therapeutic potassium channel activation
A third of the global population relies heavily upon traditional or folk medicines, such as the African shrub Mallotus oppositifolius. Here, we used pharmacological screening and electrophysiological analysis in combination with in silico docking and site-directed mutagenesis to elucidate the effects of M. oppositifolius constituents on KCNQ1, a ubiquitous and influential cardiac and epithelial voltage-gated potassium (Kv) channel. Two components of the M. oppositifolius leaf extract, mallotoxin (MTX) and 3-ethyl-2-hydroxy-2-cyclopenten-1-one (CPT1), augmented KCNQ1 current by negative shifting its voltage dependence of activation. MTX was also highly effective at augmenting currents generated by KCNQ1 in complexes with native partners KCNE1 or SMIT1; conversely, MTX inhibited KCNQ1-KCNE3 channels. MTX and CPT1 activated KCNQ1 by hydrogen bonding to the foot of the voltage sensor, a previously unidentified drug site which we also find to be essential for MTX activation of the related KCNQ2/3 channel. The findings elucidate the molecular mechanistic basis for modulation by a widely used folk medicine of an important human Kv channel and uncover novel molecular approaches for therapeutic modulation of potassium channel activity.
Data from: A low-threshold potassium current enhances sparseness and reliability in a model of avian auditory cortex
Birdsong is a complex vocal communication signal, and like humans, birds need to discriminate between similar sequences of sound with different meanings. The caudal mesopallium (CM) is a cortical-level auditory area implicated in song discrimination. CM neurons respond sparsely to conspecific song and are tolerant of production variability. Intracellular recordings in CM have identified a diversity of intrinsic membrane dynamics, which could contribute to the emergence of these higher-order functional properties. We investigated this hypothesis using a novel linear-dynamical cascade model that incorporated detailed biophysical dynamics to simulate auditory responses to birdsong. Neuron models that included a low-threshold potassium current present in a subset of CM neurons showed increased selectivity and coding efficiency relative to models without this current. These results demonstrate the impact of intrinsic dynamics on sensory coding and the importance of including the biophysical characteristics of neural populations in simulation studies.
Datasets to Impact of Nano-sized Inorganic Fillers on PEO-based Electrolytes for Potassium Batteries
<p>This dataset provides the raw data to the manuscript</p><p><strong>"Impact of Nano‐Sized Inorganic Fillers on PEO‐Based Electrolytes for Potassium Batteries"</strong></p><p>published in Batteries & Supercaps, <strong>2023</strong>, e202300404. https://doi.org/10.1002/batt.202300404</p><p> </p><p>Specifically, the following measurements are provided in separate zip folders:</p><p>Solid polymer electrolytes characterization:</p><p>Differential Scanning Calorimetry ("DSC.zip")</p><p>Rheological measurements ("Rheology.zip")</p><p>Electrochemical Impedance Spectroscopy ("PEIS.zip")</p><p>Plating and Stripping Experiments ("Plating-Stripping.zip")</p><p>Galvanostatic Cycling with Potential Limitations (GCPL.zip)</p><p> </p><p>Experimental and sample details, including assignment to filenames are provided in the respective README files.</p>
Figure S1: Nutrient concentration of lettuce (Lactuca sativa 'Rex') plants grown at different total incident light levels in deep water culture hydroponics. Lines show multiple regression analysis results, indicating no significant interactions. Each data point represents one plant. N = nitrogen, P = phosphorus, K = potassium, Ca = calcium, Mg = magnesium, S = sulfur, B = boron, Cu = copper, Fe = iron, Mn = manganese, and Zn = zinc.
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Supplementary Tables S1-S5 for an article "Square Antiprismatic Chelation Is a Key Determinant for Potassium Ion Selectivity"
<p>This file contain tables S1-S5 for the supporting information from the original paper. These tables describe potassium binding sites indentifieid in potassium channels, other membrane proteins and randomly chosen non-membrane proteins. (See the article text for details)</p> <p> </p>
Square Antiprismatic Chelation Is a Key Determinant for Potassium Ion Selectivity
<p><strong>DATASETS</strong></p> <p>Archives <em>K_DB.tar.gz</em>, <em>MEMB_DB.tar.gz</em> and <em>PDB70.tar.gz</em> contain models of indentified sites for potassium channels (dataset #1), other membrane proteins, excluding potassium channels (dataset #2) and non-membrane proteins form PDB70 (dataset #3). The name of a folder in the dataset corresponds to PDB ID of a protein for which calculation were made. Each folder contain the following files:</p> <ul> <li><PDB_ID>.pdb — the original pdb file.</li> <li><PDB_ID>.ref — file that contains oxygens and nitrogens from original pdb that were used for scanning.</li> <li><PDB_ID>_COMBS.txt — combinations of atoms that were used for calculations.</li> <li><PDB_ID>_alignment_X.pdb — original template that was aligned to the protein atoms. X denotes a number of the alignment.</li> <li><PDB_ID>_site_X.pdb — this pdb file contains eight atoms that form the site for K+ and which were used for the corresponding alignment X.</li> <li><PDB_ID>_RES.txt — the combinations of protein atoms that form the site are written in square brackets. The RMSD value for the alignment to this site is written to the right of them.</li> <li><PDB_ID>_RMSD.log — this file contains RMSD values of the template alignment to the corresponding site.</li> </ul> <p><strong>SUPPLEMENTARY TABLES S1-S5</strong></p> <p>The file <em>Supporting Information_Tables S1-S5.xlsx </em>contain tables S1-S5 for the supporting information from the original paper. These tables describe potassium binding sites indentifieid in potassium channels, other membrane proteins and randomly chosen non-membrane proteins. (See the article text for details)</p> <p> </p>
Potassium Isotopes in Herbaceous Plants: a Potential New Tool for C3 and C4 Plant
<p>Dataset of Journal article titled "Potassium Isotopes in Herbaceous Plants: a Potential New Tool for C<sub>3</sub> and C<sub>4</sub> Plant" published in Journal of Geophysical Research - Biogeosciences.</p>
Data from Selectivity filter mutations shift ion permeation mechanism in potassium channels
<p>Example mdp, gro files, topologies, scripts, run input files and trajectories used in https://doi.org/10.1101/2023.04.17.537168</p>
POPC:POPS (5:1) with 890 mM potassium simulation with CHARMM36 at 298K
<p>POPC:POPS (5:1) with 890 mM potassium simulation with CHARMM36 at 298K. Trajectory 50-200ns. 110 POPC molecules, 22 POPS molecules, 4946 water molecules and 79 Na<sup>+ </sup>ions.</p>
POPC:POPS (5:1) with 450 mM potassium simulation with CHARMM36 at 298K
<p>POPC:POPS (5:1) with 450 mM potassium simulation with CHARMM36 at 298K. Trajectory 50-200ns. 110 POPC molecules, 22 POPS molecules, 4926 water molecules and 40 Na<sup>+ </sup>ions.</p>
Supporting Data for "Potassium Alloy Reference Electrodes for Potassium-Ion Batteries: The K-In and K-Bi Systems"
<p>This is the dataset of the data for our publication "Potassium Alloy Reference Electrodes for Potassium-Ion Batteries: The K-In and K-Bi Systems". This archive contains all the raw data gathered and used to produce the results presented in this manuscript.</p> <p>Abstract of manuscript:</p> <div> <div> <div> <div> <p>Potassium-ion batteries (KIBs) are a promising alternative to conventional lithium- ion batteries with reduced critical mineral dependency, but accurate three-electrode characterization is hindered by the lack of a suitable reference electrode. Potassium metal is frequently used as a reference electrode out of necessity, but its high reactivity and unstable potential limit its reliability. Here we investigate the K-In and K-Bi alloy systems, synthesize two-phase In-In4K and Bi-Bi2K alloys, and identify Bi-Bi2K as a promising material owing to its stable potential of 1.07 V vs. K+/K. We prove the use of Bi-Bi2K as a reference electrode by cycling graphite in three-electrode cells and demonstrate that it results in significantly less electrolyte reduction than potassium metal, facilitating the accurate electrochemical characterization necessary to accelerate KIB development.</p> </div> </div> </div> </div>
Differential molecular interactions between iberiotoxin and human SLO3 and SLO1 potassium channels: Data and Software Availability
<p>Considering the need for new male contraceptives, we evaluated the molecular interactions between the human SLO3 and SLO1 potassium channels and iberiotoxin, to provide structural insights for drug development. Here, we provide the supporting data of our manuscript.</p>
Arsenic(III)-Oxide Intercalates with Potassium Chloride: Water-Induced Varieties and New Synthesis Methods. Raw diffraction data.
<p>Diffraction data for CSD 2055421-2055423.</p>
Data: Thermodiffusion of aqueous solutions of various potassium salts
<p>Data, which are presented in the following publication: Mohanakumar, Shilpa; Luettmer-Strathmann, Jutta; Wiegand, Simone (2021): Thermodiffusion of aqueous solutions of various potassium salts. In: J Chem Phys 154 (8), S. 84506. DOI: 10.1063/5.0038039.</p>
Supporting data for "Fundamental Investigations on the Ionic Transport and Thermodynamic Properties of Non-aqueous Potassium-Ion Electrolytes"
<p>This is the dataset of the electrochemical, densitometry and XPS data for our publication "Fundamental Investigations on the Ionic Transport and Thermodynamic Properties of Non-aqueous Potassium-Ion Electrolytes". This archive contains the raw data and python scripts used in the analysis and modelling for the presentation of the results in this manuscript.</p> <p>Abstract of manuscript:</p> <p>Non-aqueous potassium-ion batteries (KIBs) represent a promising complementary technology to lithium-ion batteries due to the availability and low cost of potassium. Moreover, the lower charge density of K<sup>+</sup> compared to Li<sup>+</sup> favour the ion-transport properties in the liquid electrolyte solutions, thus, making KIBs potentially capable of improved rate capability and low-temperature performance. However, a comprehensive study of the ionic transport and thermodynamic properties of non-aqueous K-ion electrolyte solutions is not available. Here we report the full characterisation of the ionic transport and thermodynamic properties of a model non-aqueous K-ion electrolyte solution system comprising potassium bis(fluorosulfonyl)imide (KFSI) salt and 1,2-dimethoxyethane (DME) solvent and compare it with its Li-ion equivalent (i.e., LiFSI:DME), over the concentration range 0.25–2 molal. Using tailored K metal electrodes, we demonstrate that KFSI:DME electrolyte solutions show higher salt diffusion coefficients and cation transference numbers than LiFSI:DME solutions. Finally, via Doyle-Fuller-Newman (DFN) simulations, we investigate the K-ion and Li-ion storage properties for K||graphite and Li||graphite cells.</p>
Fig. 3 in Glycine max (L.) Merr. (Soybean) metabolome responses to potassium availability
Fig. 3. Complete feature-based molecular network (FBMN) in global natural product social molecular networking (GNPS) of soybean trifoliate leaves and pod tissues, influenced by K+ availability. Nodes represent MS2 spectra and are connected based on spectral similarity defined (cosine score ≥ 0.8), matched fragment ion (5), and network TopK (10), encompassing 902 nodes and 1430 edges organised in 89 spectral molecular families. Large coloured nodes represent metabolites influ- enced by K+ nutrition identified by chemometrics models and representative chemical ontology.
Fig. 4 in Glycine max (L.) Merr. (Soybean) metabolome responses to potassium availability
Fig. 4. Isoflavonoids (isoflavones, coumestans and pterocarpans) and triterpenoid saponins (soyasaponins) as phytoalexins upregulated in soybean leaves under very low potassium availability.
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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.