38,207 results match your criteria electrical resistance


Adaptive current-flow models of ECT: Explaining individual static impedance, dynamic impedance, and brain current density.

Brain Stimul 2021 Jul 28. Epub 2021 Jul 28.

Department of Biomedical Engineering, The City College of New York, CUNY, New York, NY, USA. Electronic address:

Background: Improvements in electroconvulsive therapy (ECT) outcomes have followed refinement in device electrical output and electrode montage. The physical properties of the ECT stimulus, together with those of the patient's head, determine the impedances measured by the device and govern current delivery to the brain and ECT outcomes.

Objective: However, the precise relations among physical properties of the stimulus, patient head anatomy, and patient-specific impedance to the passage of current are long-standing questions in ECT research and practice. Read More

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In Vitro Study of Permeability in Lymphatic Endothelial Cells Responding to Histamine.

Authors:
Hongjiang Si

Methods Mol Biol 2021 ;2319:45-49

Department of Medical Physiology, College of Medicine, Texas A&M University, Bryan, TX, USA.

Histamine is well characterized to cause hyperpermeability in both blood and lymphatic endothelial cells (BECs and LECs) in infection and inflammation. The increased permeability impairs the barrier function of vessels to fluid, soluble electrolytes, and proteins, resulting in the swelling of interstitial tissues, termed edema and lymphedema. Here, we describe two approaches to study the permeability of LECs, to macromolecules or to electrolytes, upon histamine stimulation in vitro. Read More

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January 2021

Association between phase angle and height-to-age index classifications of children under five years of age.

Clin Nutr ESPEN 2021 Aug 26;44:367-371. Epub 2021 May 26.

Faculdade de Nutrição, Universidade Federal de Alagoas, Maceió, Alagoas, 57072-970, Brazil. Electronic address:

Background & Aims: The phase angle (PA) has been used as an indicator of prognosis and nutritional status because it reflects the integrity of the individuals' cellular function. In contrast to the investigations that assessed acute malnutrition (weight deficit) and PA in children, studies that evaluated the relationship of this indicator with stunting (height deficit) are still scarce and inconclusive. Thus, we aim to investigate whether there are differences in PA according to the classifications of the height-for-age (H/A) index of children under five years of age. Read More

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A fast scan cyclic voltammetric digital circuit with precise ohmic drop compensation by online measuring solution resistance and its biosensing application.

Anal Chim Acta 2021 Aug 9;1175:338744. Epub 2021 Jun 9.

State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, State Key Laboratory Base of Novel Functional Materials and Preparation Science, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, PR China. Electronic address:

In this work, a novel fast scan digital circuit for voltammetric analysis with precious ohmic drop compensation is developed, which is achieved through online measuring solution resistance first and then proportionally feedbacking the output signal to potentiostat's in-phase input through a potentiometer. It mainly consists of a solution resistance measurement module based on AD5933 chip, an ohmic drop automatic compensation module and a STM32F103ZET6 microcontroller. The performance of the circuit is checked successively using pure resistances, RC dummy cells, RC dummy cells incorporating a pseudo-faradaic component, and the ferrocene redox system. Read More

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Nonlinear adaptive control of magnetic levitation system using terminal sliding mode and integral backstepping sliding mode controllers.

ISA Trans 2021 Jul 20. Epub 2021 Jul 20.

School of Electrical Engineering and Computer Science, National University of Sciences and Technology (NUST), Islamabad, Pakistan.

Magnetic levitation (MagLev) system is an unstable, highly non-linear and dynamically fast. These characteristics make it challenging task to design a suitable controller to ensure any object to stay at a certain distance from the electromagnet with negligible error. It can be achieved by generating the required flux with the help of a control input. Read More

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Early-stage culprit in protein misfolding diseases investigated using electrochemical parameters: New insights over peptide-membrane interactions.

Biomed Pharmacother 2021 Jul 28;142:111964. Epub 2021 Jul 28.

Department of Applied Chemistry, School of Applied Natural Science, Adama Science and Technology University, P O Box 1888, Adama, Ethiopia. Electronic address:

The dysfunctioning of β-cells caused by the unspecific misfolding of the human islet amyloid polypeptide (hIAPP) at the membrane results in type 2 diabetes mellitus. Here, we report for the first time, the early-stage interaction of hIAPP oligomers on the DMPC (1,2-dimyristoyl-sn-glycero-3-phosphocholine) lipid membrane using electrochemical parameters. Electrochemical techniques are better than other techniques to detect hIAPP at significantly lower concentrations. Read More

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Observation of Zero-Field Transverse Resistance in AlO_{x}/SrTiO_{3} Interface Devices.

Phys Rev Lett 2021 Jul;127(3):036801

Department of Physics, Northwestern University, Evanston, Illinois 60208, USA.

Domain walls in AlO_{x}/SrTiO_{3} (AlO_{x}/STO) interface devices at low temperatures give a rise to a new signature in the electrical transport of two-dimensional carrier gases formed at the surfaces or interfaces of STO-based heterostructures: a finite transverse resistance observed in Hall bars in zero external magnetic field. This transverse resistance depends on the local domain wall configuration and hence changes with temperature, gate voltage, thermal cycling, and position along the sample and can even change sign as a function of these parameters. The transverse resistance is observed below ≃70  K but grows and changes significantly below ≃40  K, the temperature at which the domain walls become increasingly polar. Read More

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Atomic-Scale Layer-by-Layer Deposition of [email protected]@AlO Hybrid with Threshold Anti-Corrosion and Ultra-High Microwave Absorption Properties in Low-Frequency Bands.

Nanomicro Lett 2021 Jul 30;13(1):161. Epub 2021 Jul 30.

National Engineering Researching Centre of Electromagnetic Radiation Control Materials, Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education, State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, People's Republic of China.

Developing highly efficient magnetic microwave absorbers (MAs) is crucial, and yet challenging for anti-corrosion properties in extremely humid and salt-induced foggy environments. Herein, a dual-oxide shell of ZnO/AlO as a robust barrier to FeSiAl core is introduced to mitigate corrosion resistance. The [email protected]@AlO layer by layer hybrid structure is realized with atomic-scale precision through the atomic layer deposition technique. Read More

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All-Weather Droplet-Based Triboelectric Nanogenerator for Wave Energy Harvesting.

ACS Nano 2021 Jul 30. Epub 2021 Jul 30.

Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China.

The liquid-solid triboelectric nanogenerator (LS-TENG) has been demonstrated to harvest energy efficiently through the contact electrification effect between liquid and solid triboelectric materials, which can avoid the wear issue in solid-solid TENG. However, the droplet-based LS-TENG reveals the problems that it generally works with the continuous falling droplets or needs to be fully packaged, which greatly limit its practical application. Here, a droplet-based triboelectric nanogenerator (DB-TENG) with a simple open structure is designed to effectively solve these problems. Read More

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Impact of Music Distraction on Dental Anxiety in Children Having Intellectual Disability.

Int J Clin Pediatr Dent 2021 Jan-Feb;14(1):170-174

Department of Pediatric and Preventive Dentistry, AB Shetty Memorial Institute of Dental Sciences, NITTE (Deemed to be University), Mangaluru, Karnataka, India.

Aim And Objective: To analyze the impact of Indian instrumental music on children with intellectual disability (mild) exhibiting dental anxiety during dental procedures using electrical skin resistance measured by a biofeedback machine.

Materials And Methods: A total of 20 children of 6-14 years having an intellectual disability (mild) were randomly divided into two groups comprising of 10 each. The study was carried out in a cross-over design, with and without music distraction in two appointments spaced out at a gap of 1 month. Read More

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A breathable and flexible fiber cloth based on cellulose/polyaniline cellular membrane for microwave shielding and absorbing applications.

J Colloid Interface Sci 2021 Jul 22;605:193-203. Epub 2021 Jul 22.

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China. Electronic address:

High-performance electromagnetic (EM) wave absorption and shielding materials integrating with flexibility, air permeability, and anti-fatigue characteristics are of great potential in portable and wearable electronics. These materials usually prepared by depositing metal or alloy coatings on fabrics. However, the shortcomings of heavy weight and easy corrosion hamper its application. Read More

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Selective and easy detection of microcystin-LR in freshwater using a bioactivated sensor based on multiwalled carbon nanotubes on filter paper.

Biosens Bioelectron 2021 Jul 24;192:113529. Epub 2021 Jul 24.

Department of Chemistry, Pukyong National University, Namgu, 48513, Republic of Korea. Electronic address:

Microcystin-LR (MC-LR) is a cyanobacterial toxin produced as a result of eutrophication in polluted water in warm weather conditions. The MC-LR could cause health problems in mammal organs such as the liver, heart, and muscle. Therefore, the World Health Organization (WHO) has stipulated a limit of <1. Read More

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Increased integrity of cell-cell junctions accompanied by increased expression of claudin 4 in keratinocytes stimulated with vitamin D3.

Med Mol Morphol 2021 Jul 29. Epub 2021 Jul 29.

Division of Pediatric Dentistry, School of Dentistry, Health Sciences University of Hokkaido, 1757 Kanazawa, Tobetsu, Ishikari, Hokkaido, 0610293, Japan.

The stratified squamous epithelium has a multilayer structure formed by the differentiation of the keratinized epithelium, which covers the skin and oral mucosa. The epithelium plays a central role in regulating the interactions between the immune system and pathogens. The tight junction (TJ) barrier, which is composed of adhesion molecules called claudins (CLDN), is critical for the homeostasis of the skin and oral mucosa. Read More

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Transglutaminase-Mediated Caseinate Oligochitosan Glycation Enhances the Effect of Caseinate Hydrolysate to Ameliorate the LPS-Induced Damage on the Intestinal Barrier Function in IEC-6 Cells.

J Agric Food Chem 2021 Jul 29. Epub 2021 Jul 29.

Department of Food Science, University of Copenhagen, 1958 Frederiksberg C, Denmark.

Some food components can regulate the intestinal barrier function. Herein, the effect of transglutaminase-type oligochitosan glycation on caseinate hydrolysate for its ability to maintain intestinal epithelial integrity and the tight junction (TJ) structure was investigated by assessing and comparing the bioactivities of glycated caseinate hydrolysate and caseinate hydrolysate against the lipopolysaccharide-induced barrier damage in the model cells (rat intestinal epithelial IEC-6 cells). The results from liquid chromatography with tandem mass spectrometry (LC-MS/MS) analysis demonstrated that oligochitosan glycation occurred at the Gln residues of α-S1-casein and α-S2-casein. Read More

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Black Phosphorus/Polymers: Status and Challenges.

Adv Mater 2021 Jul 29:e2100113. Epub 2021 Jul 29.

Collaborative Innovation Center for Optoelectronic Science & Technology, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, 518060, China.

As a newly emerged mono-elemental nanomaterial, black phosphorus (BP) has been widely investigated for its fascinating physical properties, including layer-dependent tunable band gap (0.3-1.5 eV), high ON/OFF ratio (10 ), high carrier mobility (10 cm V s ), excellent mechanical resistance, as well as special in-plane anisotropic optical, thermal, and vibrational characteristics. Read More

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Neuropeptide modulation increases dendritic electrical spread to restore neuronal activity disrupted by temperature.

J Neurosci 2021 Jul 28. Epub 2021 Jul 28.

School of Biological Sciences, Illinois State University, Normal, IL 61790, USA

Peptide neuromodulation has been implicated to shield neuronal activity from acute temperature changes which can otherwise lead to loss of motor control or failure of vital behaviors. However, the cellular actions neuropeptides elicit to support temperature-robust activity remain unknown. Here, we uncover that peptide neuromodulation restores rhythmic bursting in temperature-compromised central pattern generator (CPG) neurons by counteracting membrane shunt and increasing dendritic electrical spread. Read More

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Pure Spin Currents Driven by Colossal Spin-Orbit Coupling on Two-Dimensional Surface Conducting SrTiO.

Nano Lett 2021 Jul 28. Epub 2021 Jul 28.

Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom.

Spin accumulation is generated by passing a charge current through a ferromagnetic layer and sensed by other ferromagnetic layers downstream. Pure spin currents can also be generated in which spin currents flow and are detected as a nonlocal resistance in which the charge current is diverted away from the voltage measurement point. Here, we report nonlocal spin-transport on two-dimensional surface-conducting SrTiO (STO) without a ferromagnetic spin-injector via the spin Hall effect (and inverse spin Hall effect). Read More

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Low Electrical Resistance Properties of Acupoints: Roles of NOergic Signaling Molecules and Neuropeptides in Skin Electrical Conductance.

Authors:
Sheng-Xing Ma

Chin J Integr Med 2021 Aug 28;27(8):563-569. Epub 2021 Jul 28.

Lundquist Institute for Biomedical Innovation at Harbor-University of California at Los Angeles (UCLA) Medical Center and Department of Obstetrics and Gynecology, David Geffen School of Medicine at UCLA and Harbor-UCLA Medical Center, Torrance, CA, 90502, United States.

Early studies from several independent laboratories demonstrated that acupoints possess the characteristics of low electrical resistance. New devices are developing to increase the reliability of electrical skin impedance measurements for counteracting the factors including skin dryness, skin thickness, size of the sensing electrode, pressure applied on the electrode, interelectrode distance, room temperature, and humidity. Morphological studies have identified that blood vessels, hair follicles, and nervous components are enhanced in the meridians/acupoints, which represent areas of potentially high neuronal activity. Read More

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Giant tunneling electroresistance arising from reversible partial barrier metallization in the NaTiO/BaTiO/LaTiO ferroelectric tunnel junction.

Phys Chem Chem Phys 2021 Jul 27. Epub 2021 Jul 27.

Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China. and Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China.

Tunneling electroresistance (TER) is the change in tunneling resistance induced by ferroelectric polarization reversal in ferroelectric tunnel junctions (FTJs), and how to achieve a giant TER has always been a central topic in the study of FTJs. In this work, by considering the NaTiO3/BaTiO3/LaTiO3 junction with asymmetric polar interfaces as an example, we propose a novel scheme to realize a giant TER based on the reversible partial metallization of ferroelectric barrier upon the switching of ferroelectric polarization. Density functional theory calculations indicate that high on-state and low off-state conductances are obtained and the TER ratio is as high as 3. Read More

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Diverse effects of pan-ROCK and ROCK2 inhibitors on 2 D and 3D cultured human trabecular meshwork (HTM) cells treated with TGFβ2.

Sci Rep 2021 Jul 27;11(1):15286. Epub 2021 Jul 27.

Department of Ophthalmology, Sapporo Medical University School of Medicine, Sapporo, Japan.

A pan-ROCK-inhibitor, ripasudil (Rip), and a ROCK2 inhibitor, KD025, were used To study the effects of Rho-associated coiled-coil containing protein kinase (ROCK)1 and 2 on two-dimensional (2D) and three-dimensional (3D) cultures of a TGFβ2-treated human trabecular meshwork (HTM) cells. In the presence of 5 ng/mL TGFβ2, the effects of these inhibitors were characterized by transendothelial electrical resistance (TEER), FITC-dextran permeability, and the size and stiffness of 3D sphenoids, the expression of extracellular matrix (ECM) including collagen1, 4 and 6, and fibronectin, α-smooth muscle actin, a tissue inhibitor of metalloproteinase (TIMP)1-4, and matrix metalloproteinase (MMP)2, 9 and 14. TGFβ2 caused a significant increase in the TEER values, and decrease in FITC-dextran permeability, as well as a decrease in the sizes and stiffness of the 3D sphenoids. Read More

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Antixenosis in Glycine max (L.) Merr against Acyrthosiphon pisum (Harris).

Sci Rep 2021 Jul 27;11(1):15289. Epub 2021 Jul 27.

Department of Botany and Ecology, University of Zielona Góra, Szafrana 1, 65-516, Zielona Góra, Poland.

To reveal the antixenosis potential against the pea aphid Acyrthosiphon pisum (Harris) (Hemiptera: Aphididae) we analyzed the pea aphid survival and probing behavior, and the quantitative and qualitative variation of flavonoids in the leaves of selected soybean Glycine max (L.) Merr (Fabaceae) cultivars 'Aldana', 'Annushka', 'Augusta', 'Madlen', 'Mavka', 'Simona', 'Violetta', and 'Viorica'. Aphid survival was drastically impeded on all cultivars. Read More

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An engineered microfluidic blood-brain barrier model to evaluate the anti-metastatic activity of β-boswellic acid.

Biotechnol J 2021 Jul 27:e2100044. Epub 2021 Jul 27.

Laboratory for Stem Cell & Regenerative Medicine, Natural and Medical Sciences Research Center, University of Nizwa, Nizwa, Oman.

Background: The development of anti-cancer drugs with the ability to inhibit brain metastasis through the blood-brain barrier (BBB) is substantially limited due to the lack of reliable in vitro models.

Main Methods: In this study, the Geltrex™-based Transwell and microfluidic BBB models were applied to screen the effect of β-boswellic acid (β-BA) on the metastasis of MDA-MB-231 cells through the BBB in static and dynamic conditions, respectively.

Major Results: The toxicity assay revealed that β-BA deteriorates MDA-MB-231 cells, while β-BA had no detectable toxic effects on human umbilical vein endothelial cells (HUVECs) and astrocytes. Read More

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Ternary Conductance Switching Realized by a Pillar[5]arene-Functionalized Two-dimensional Imine Polymer Film.

Chemistry 2021 Jul 26. Epub 2021 Jul 26.

Tianjin University, Department of Chemistry, CHINA.

Nowadays, most manufacturing memory devices are based on materials with electrical bistability (i.e., "0" and "1") in response to an applied electric field. Read More

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A novel application of simple submersible yeast-based microbial fuel cells as dissolved oxygen sensors in environmental waters.

Enzyme Microb Technol 2021 Sep 15;149:109831. Epub 2021 May 15.

Solar Energy Research Institute, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia; Research Centre for Electrical Power and Mechatronics, Indonesian Institute of Sciences (LIPI), Bandung, Indonesia. Electronic address:

In this study, yeast microbial fuel cells (MFCs) were established as biosensors for in-situ monitoring of dissolved oxygen (DO) levels in environmental waters, with yeast and glucose substrates acting as biocatalyst and fuel, respectively. Diverse environmental factors, such as temperature, pH and conductivity, were considered. The sensor performance was first tested with distilled water with different DO levels ranging from 0 mg/L to 8 mg/L and an external resistance of 1000 Ω. Read More

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September 2021

Efficient oxygen reduction electrocatalyst derived from facile Fe,N-surface treatment of carbon black.

J Colloid Interface Sci 2021 Jul 18;605:101-109. Epub 2021 Jul 18.

Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710119, China. Electronic address:

The development of nonprecious metal-based electrocatalysts for oxygen reduction reaction (ORR) is a central task in renewable electrochemical energy conversion and storage technologies. Iron-nitrogen doped carbon-based (Fe-N/C) materials are promising alternatives to Pt-based ORR electrocatalysts. Owing to large specific surface area and outstanding electrical conductivity, carbon black is an inborn support for electrocatalysts. Read More

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Computer vision for detecting field-evolved lepidopteran resistance to Bt maize.

Pest Manag Sci 2021 Jul 26. Epub 2021 Jul 26.

Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA.

Background: Resistance evolution of lepidopteran pests to Bacillus thuringiensis (Bt) toxins produced in maize and cotton is a significant issue worldwide. Effective toxin stewardship requires reliable detection of field-evolved resistance to enable the implementation of mitigation strategies. Currently, visual estimates of maize injury are used to document changing susceptibility. Read More

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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride.

J Vis Exp 2021 Jul 8(173). Epub 2021 Jul 8.

Maryland Quantum Materials Center, Department of Physics, University of Maryland; National Institute of Standards and Technology;

Single crystal specimens of the actinide compound uranium ditelluride, UTe2, are of great importance to the study and characterization of its dramatic unconventional superconductivity, believed to entail spin-triplet electron pairing. A variety in the superconducting properties of UTe2 reported in the literature indicates that discrepancies between synthesis methods yield crystals with different superconducting properties, including the absence of superconductivity entirely. This protocol describes a process to synthesize crystals that exhibit superconductivity via chemical vapor transport, which has consistently exhibited a superconducting critical temperature of 1. Read More

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Achieving Super Sensitivity in Capacitive Strain Sensing by Electrode Fragmentation.

ACS Appl Mater Interfaces 2021 Jul 26. Epub 2021 Jul 26.

King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division (PSE), COHMAS Laboratory, Thuwal 23955-6900, Saudi Arabia.

Accurate wireless strain monitoring is critical for many engineering applications. Capacitive strain sensors are well suited for remote sensing but currently have a limited sensitivity. This study presents a new approach for improving the sensitivity of electrical capacitance change-based strain sensors. Read More

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A Robust Context-Based Deep Learning Approach for Highly Imbalanced Hyperspectral Classification.

Comput Intell Neurosci 2021 6;2021:9923491. Epub 2021 Jul 6.

Water Resources Research Institute, University of the District of Columbia, Washington, DC 20008, USA.

Hyperspectral imaging is an area of active research with many applications in remote sensing, mineral exploration, and environmental monitoring. Deep learning and, in particular, convolution-based approaches are the current state-of-the-art classification models. However, in the presence of noisy hyperspectral datasets, these deep convolutional neural networks underperform. Read More

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Real-time impedance feedback to enhance cutaneous gene electrotransfer in a murine skin model.

Bioelectrochemistry 2021 Jul 13;142:107885. Epub 2021 Jul 13.

Department of Chemical, Biological, and Materials Engineering, University of South Florida, 4202 E. Fowler Ave ENG 030, Tampa, FL 33620, USA; Center for Molecular Delivery at USF, University of South Florida, 4202 E. Fowler Ave ENG 030, Tampa, FL 33620, USA; Department of Medical Engineering, University of South Florida, 4202 E. Fowler Avenue ENG 030, Tampa, FL 33620, USA. Electronic address:

Electric field mediated gene delivery methods have the ability to efficiently transfect cells in vivo with an excellent safety profile. The method has historically used a fixed number of electric pulses with identical characteristics in induce delivery. Electrical treatment does not typically compensate for subject-to-subject variation and other differences. Read More

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