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Journal of Colloid and Interface Science Jun 2024Exploring robust electrode materials which could permit fast and reversible insertion/extraction of large K is a crucial challenge for potassium-ion batteries (PIBs)....
Exploring robust electrode materials which could permit fast and reversible insertion/extraction of large K is a crucial challenge for potassium-ion batteries (PIBs). Smart interfacial design could facilitate electron/ion transport as well as assure the integrity of electrode. Herein, Cetyltrimethylammonium bromide (CTAB) was found to play bifunctional roles in construction of NbCT@MoSe heterostructure. Firstly, functionalization of CTAB on the surface of NbCT could influence the subsequent growth of MoSe by electrostatic effect, stereochemical effect and the synergetic Lewis acid-base interaction, leading to the formation of NbCT@MoSe with tiled heterostructure. Secondly, the interlayer spacing of NbCT was expanded from 0.77 to 1.21 nm owing to the pillar effect of CTAB. As excepted, the capacity retention was 80 % from 100 mA g (406 mA h g) to 1000 mA g concerning rate capability and the specific capacity maintained at 240 mA h g (at 2000 mA g) over 300 cycles. The calculated D values from Galvanostatic intermittent titration technique (GITT) measurement of the titled C-T-NbCT@MoSe@C electrode is two orders of magnitude larger than the traditional T-NbCT@MoSe@C electrode, further confirming intimate interface between MoSe and NbCT could provide convenient potassium-ion transport channels and fast diffusion kinetics. Finally, ex-situ characterizations at different charging and discharging voltage stages, including ex-situ XRD/Raman/HRTEM/XPS have been carried out to reveal the potassium storage mechanism. This work provides a facile strategy for the regulation of interface engineering by the assist of CTAB which could extend to other MXenes-TMDs (Transition metal dichalcogenides) hybrid electrodes.
PubMed: 38909591
DOI: 10.1016/j.jcis.2024.06.146 -
Journal of Colloid and Interface Science Jun 2024Potassium-ion hybrid capacitors (PIHC) are considered as ideal large-scale rechargeable energy storage devices due to their low-cost, high-power density and...
Potassium-ion hybrid capacitors (PIHC) are considered as ideal large-scale rechargeable energy storage devices due to their low-cost, high-power density and environmental protection. However, a low energy density is the main factor restricting the practical application of PIHC. The interface is formed on the surface of electrode material of PIHC through strong correlation to construct heterojunction, which can significantly improve the performance of ion energy storage. However, how to reveal the influence of the interfacial state of the heterojunction on the adsorption and electron transmission of energy storage ions at the atomic level is still one of the key scientific problems in this field. In this work, metal ion intercalation and microwave-assisted in-situ etching are used to construct the Hexagon MXene TiC heterojunction with TiOHO strong correlation. At the interface of heterojunction, TiOHO highway for electron transmission is developed to improve the rate performance of PIHC. Through experimental and theoretical calculation, the optimum adsorption position and maximum adsorption amount of potassium-ion at the single interface of heterojunction are obtained, and the specific energy density of PIHC is increased. This lays a foundation for the practical application of high-performance soft-package PIHC.
PubMed: 38909491
DOI: 10.1016/j.jcis.2024.06.115 -
Physical Review. E May 2024Agent-based models were used to describe electrical signaling in bacterial biofilms in three dimensions. Specifically, wavefronts of potassium ions in Escherichia coli...
Agent-based models were used to describe electrical signaling in bacterial biofilms in three dimensions. Specifically, wavefronts of potassium ions in Escherichia coli biofilms subjected to stress from blue light were modeled from experimental data. Electrical signaling occurs only when the biofilms grow beyond a threshold size, which we have shown to vary with the K^{+} ion diffusivity, and the K^{+} ion threshold concentration, which triggered firing in the fire-diffuse-fire model. The transport of the propagating wavefronts shows superdiffusive scaling on time. K^{+} ion diffusivity is the main factor that affects the wavefront velocity. The K^{+} ion diffusivity and the firing threshold also affect the anomalous exponent for the propagation of the wavefront determining whether the wavefront is subdiffusive or superdiffusive. The geometry of the biofilm and its relation to the mean-square displacement (MSD) of the wavefront as a function of time was investigated for spherical, cylindrical, cubical, and mushroom-like structures. The MSD varied significantly with geometry; an additional regime to the kinetics occurred when the potassium wavefront leaves the biofilm. Adding cylindrical defects to the biofilm, which are known to occur in E. coli biofilms, also gave an extra kinetic regime to the wavefront MSD for the propagation through the defect.
Topics: Biofilms; Escherichia coli; Models, Biological; Potassium; Diffusion; Electrophysiological Phenomena
PubMed: 38907459
DOI: 10.1103/PhysRevE.109.054402 -
PloS One 2024Bandon Bay is a very fertile bay for coastal aquaculture, especially for blood cockles (Anadara granosa). Its structural pattern supports the flow of nutrients which...
Bandon Bay is a very fertile bay for coastal aquaculture, especially for blood cockles (Anadara granosa). Its structural pattern supports the flow of nutrients which directly sent from many rivers resulted the high production capacity of blood cockle at the top level in the country. Besides organic compounds present in sediment, inorganic substances are essential for growth, survival and shell development of blood cockles. A comparative study of minerals and oxide compounds which accumulated in the sediments at eight stations around the cockle culture area was conducted. These stations are located along the estuaries at Tha Thong, Tha Chang, Phum Riang, and Tapi. The proportion of oxide compounds were determinedusing X-Ray Fluorescence (XRF) technique and minerals were analyzed by Atomic Absorption Spectroscopy (AAS). Results showed that sediment characteristics, oxide composition and the amount of minerals among the stations are different from each other. The sediments of the eastern and the western coasts were characterized as crumble clay and muddy sand, respectively. Twelve types of oxide compounds, namely SiO2, Al2O3, Fe2O3, K2O, Cl, MgO, Na2O, SO3, CaO, TiO2, MnO, P2O5 were found in various quantities, with SiO2, Al2O3, and Fe2O3 were the fundamental minerals ranging from 85.64-90.82%. Tha Thong estuary in the east coast showed highly significant quantities (P<0.05) of potassium, calcium and manganese compared to the other estuaries.
Topics: Geologic Sediments; Thailand; Minerals; Oxides; Bays; Animals; Cardiidae; Aquaculture; Spectrometry, X-Ray Emission; Spectrophotometry, Atomic
PubMed: 38905193
DOI: 10.1371/journal.pone.0305061 -
Alternative Therapies in Health and... Jun 2024To evaluate the impact of differential emergency treatment measures on the prognosis of patients with ACS.
OBJECTIVE
To evaluate the impact of differential emergency treatment measures on the prognosis of patients with ACS.
METHODS
76 patients with ACS treated in the emergency department of our hospital from January 2017 to September 2021 were selected as the research objects. According to their main symptoms, general signs, and various examination results when arriving at the hospital, differential emergency treatment measures were implemented, so as to ensure the curative effect.
RESULT
After comprehensive emergency treatment, the venous blood test indicators of patients, including creatinine (CR), uric acid (UA), total cholesterol (TC), triglyceride (TG), high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C), lipoprotein A (LPA), Apolipoprotein AI (ApoAI), Apolipoprotein B (ApoB), Potassium ion (K+), glucose (GLU), Cardiac troponin I (cTn) returned to normal. In addition, the proportion of patients without cardiogenic shock, ventricular fibrillation, respiratory and cardiac arrest, cerebral infarction, cerebral hemorrhage, arrhythmia, heart rupture, and other adverse reactions are as high as 92% (70/76).
CONCLUSION
For patients with ACS, it is necessary to take correct emergency rescue and treatment measures immediately, especially to actively implement the percutaneous coronary intervention (PCI) method, so as to give full play to the safety and effectiveness of emergency treatment and curb the possibility of patient death as much as possible.
PubMed: 38904625
DOI: No ID Found -
Frontiers in Physiology 2024Ion channels play a pivotal role in regulating cellular excitability and signal transduction processes. Among the various ion channels, G-protein-coupled inwardly... (Review)
Review
Ion channels play a pivotal role in regulating cellular excitability and signal transduction processes. Among the various ion channels, G-protein-coupled inwardly rectifying potassium (GIRK) channels serve as key mediators of neurotransmission and cellular responses to extracellular signals. GIRK channels are members of the larger family of inwardly-rectifying potassium (Kir) channels. Typically, GIRK channels are activated via the direct binding of G-protein βγ subunits upon the activation of G-protein-coupled receptors (GPCRs). GIRK channel activation requires the presence of the lipid signaling molecule, phosphatidylinositol 4,5-bisphosphate (PIP). GIRK channels are also modulated by endogenous proteins and other molecules, including RGS proteins, cholesterol, and SNX27 as well as exogenous compounds, such as alcohol. In the last decade or so, several groups have developed novel drugs and small molecules, such as ML297, GAT1508 and GiGA1, that activate GIRK channels in a G-protein independent manner. Here, we aim to provide a comprehensive overview focusing on the direct modulation of GIRK channels by G-proteins, PIP, cholesterol, and novel modulatory compounds. These studies offer valuable insights into the underlying molecular mechanisms of channel function, and have potential implications for both basic research and therapeutic development.
PubMed: 38903913
DOI: 10.3389/fphys.2024.1386645 -
Functional Plant Biology : FPB Jun 2024Potassium (K) is essential for the development of grapevines (Vitis vinifera ), accumulating into berries during maturation. Elevated K has been associated with high...
Potassium (K) is essential for the development of grapevines (Vitis vinifera ), accumulating into berries during maturation. Elevated K has been associated with high sugar and low acidity in juice. Characterising the accumulation patterns of K and other components in pericarps treated with various experimental factors may indicate potential regulators of berry K levels. A soil fertiliser trial using nutrient solutions with two K supply rates was conducted on potted Shiraz vines during berry ripening. Doubled-K supply increased L-malic acid content in the early-ripening phase, and increased K and magnesium concentrations in the late-ripening phase. Doubled-K supply reduced the ratio of K to sodium in later ripening phases, suggesting that the accumulation of K relative to sodium was limited in more mature berries supplied with extra K. Pericarp water percentage, sugar, K and ATP were correlated in both treatments, indicating links between hydration, solute transport and energy in maturing berries. In a separate rootstock trial over the two growing seasons, Shiraz scions grafted onto 420-A rootstock produced berries with lower K concentration and content than those grafted onto Ramsey or Ruggeri-140 rootstocks and own-rooted vines. This study demonstrated that the K supply and berry ripening phase impacted the berry K level.
Topics: Potassium; Fruit; Vitis; Water; Plant Roots; Sodium
PubMed: 38902904
DOI: 10.1071/FP23141 -
Nature Communications Jun 2024DNA binding transcription factors possess the ability to interact with lipid membranes to construct ion-permeable pathways. Herein, we present a thiazole-based DNA...
DNA binding transcription factors possess the ability to interact with lipid membranes to construct ion-permeable pathways. Herein, we present a thiazole-based DNA binding peptide mimic TBP2, which forms transmembrane ion channels, impacting cellular ion concentration and consequently stabilizing G-quadruplex DNA structures. TBP2 self-assembles into nanostructures, e.g., vesicles and nanofibers and facilitates the transportation of Na and K across lipid membranes with high conductance (~0.6 nS). Moreover, TBP2 exhibits increased fluorescence when incorporated into the membrane or in cellular nuclei. Monomeric TBP2 can enter the lipid membrane and localize to the nuclei of cancer cells. The coordinated process of time-dependent membrane or nuclear localization of TBP2, combined with elevated intracellular cation levels and direct G-quadruplex (G4) interaction, synergistically promotes formation and stability of G4 structures, triggering cancer cell death. This study introduces a platform to mimic and control intricate biological functions, leading to the discovery of innovative therapeutic approaches.
Topics: Humans; Peptidomimetics; DNA; G-Quadruplexes; Potassium; Cell Line, Tumor; Sodium; Cell Nucleus; Ion Channels; DNA-Binding Proteins
PubMed: 38902227
DOI: 10.1038/s41467-024-49534-0 -
Journal of the American Chemical Society Jun 2024Solution structures of potassium hexamethyldisilazide [KHMDS] and labeled [N]KHMDS were examined using a number of analytical methods including Si NMR spectroscopy and...
Solution structures of potassium hexamethyldisilazide [KHMDS] and labeled [N]KHMDS were examined using a number of analytical methods including Si NMR spectroscopy and density functional theory computations. A combination of N-Si couplings, Si chemical shifts, and the method of continuous variations reveals dimers, monomers, and ion pairs. Weakly coordinating monofunctional ligands such as toluene, -dimethylethylamine, and EtN afford exclusively dimers. 1,3-Dioxolane, THF, dimethoxyethane, hexamethylphosphoramide, and diglyme provide dimers at low ligand concentrations and monomers at high ligand concentrations. -Tetramethylethylenediamine and -tetramethylcyclohexanediamine provide exclusively dimers at all ligand concentrations at ambient temperatures and significant monomer at -80 °C. Studies of 12-crown-4 ran into technical problems. Equimolar 15-crown-5 forms a dimer, whereas excess 15-crown-5 affords a putative ion pair. Whereas equimolar 18-crown-6 also affords a dimer, an excess provides a monomer rather than a solvent-separated ion pair. [2.2.2]cryptand affords what is believed to be a contact-ion-paired cryptate. Solvation was probed using largely density functional theory (DFT) computations. Thermally corrected energies are consistent with lower aggregates and higher solvates at low temperatures, but the magnitudes of the computed temperature dependencies were substantially larger than the experimentally derived data.
PubMed: 38901126
DOI: 10.1021/jacs.4c03418 -
Small (Weinheim An Der Bergstrasse,... Jun 2024Metal chalcogenides as an ideal family of anode materials demonstrate a high theoretical specific capacity for potassium ion batteries (PIBs), but the huge volume...
Metal chalcogenides as an ideal family of anode materials demonstrate a high theoretical specific capacity for potassium ion batteries (PIBs), but the huge volume variance and poor cyclic stability hinder their practical applications. In this study, a design of a stress self-adaptive structure with ultrafine SnSe nanoparticles embedded in carbon nanofiber (SnSe@CNF) via the electrospinning technology is presented. Such an architecture delivers a record high specific capacity (272 mAh g at 50 mA g) and high-rate performance (125 mAh g at 1 A g) as a PIB anode. It is decoded that the fundamental understanding for this great performance is that the ultrafine SnSe particles enhance the full utilization of the active material and achieve stress relief as the stored strain energy from cycling is insufficient to drive crack propagation and thus alleviates the intrinsic chemo-mechanical degradation of metal chalcogenides.
PubMed: 38895955
DOI: 10.1002/smll.202402845