keyword
MENU ▼
Read by QxMD icon Read
search

impedance

keyword
https://www.readbyqxmd.com/read/29679892/electric-field-driven-assembly-of-live-bacterial-cell-microarrays-for-rapid-phenotypic-assessment-and-cell-viability-testing
#1
Meenal Goel, Abhishek Verma, Shalini Gupta
Microarray technology to isolate living cells using external fields is a facile way to do phenotypic analysis at the cellular level. We have used alternating current dielectrophoresis (AC-DEP) to drive the assembly of live pathogenic Salmonella typhi (S.typhi) and Escherichia coli (E.coli) bacteria into miniaturized single cell microarrays. The effects of voltage and frequency were optimized to identify the conditions for maximum cell capture which gave an entrapment efficiency of 90% in 60 min. The chip was used for calibration-free estimation of cellular loads in binary mixtures and further applied for rapid and enhanced testing of cell viability in the presence of drug via impedance spectroscopy...
April 7, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29679836/physical-immobility-as-a-sensitive-indicator-of-hydraulic-fracturing-fluid-toxicity-towards-daphnia-magna
#2
Tamzin A Blewett, Perrine L M Delompré, Chris N Glover, Greg G Goss
The process of extracting hydrocarbon resources by hydraulic fracturing is an increasingly utilised technique worldwide, resulting in an effluent called flowback and produced water (FPW). This effluent is a complex mixture of salts, metals and organic compounds, and has been shown to be highly toxic to aquatic biota, an effect attributed mainly to its salt and organic components. However, in the current study we show that the water flea, Daphnia magna, is physically impaired by, and rendered immobile at the surface of, test waters containing FPW...
April 18, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29679518/new-insights-in-the-use-of-pleural-ultrasonography-for-diagnosis-and-treatment-of-pleural-disease
#3
Giampietro Marchetti, Sabrina Arondi, Francesca Baglivo, Sara Lonni, Federico Quadri, Alberto Valsecchi, Nicola Venturoli, Paolo Ceruti
The use of transthoracic ultrasound has acquired a wide consensus among respiratory physicians during the last few years. The developing of portable and easily available devices favorites patient's bedside evaluation. Transthoracic ultrasound provides rapid, real-time and low-cost diagnostic information, allowing image-guided chest interventions and reducing procedural risks. The different acoustic impedance between aerated and not aerated organs produces artifacts known as A lines, B lines, sliding sign, lung point, etc...
April 21, 2018: Clinical Respiratory Journal
https://www.readbyqxmd.com/read/29679498/7t-ultra-high-field-body-mr-imaging-with-an-8-channel-transmit-32-channel-receive-radiofrequency-coil-array
#4
Stefan H G Rietsch, Stephan Orzada, Stefan Maderwald, Sascha Brunheim, Bart W J Philips, Tom W J Scheenen, Mark E Ladd, Harald H Quick
PURPOSE: In this work a combined body coil array with 8 transmit/receive (Tx/Rx) meander elements and with 24 receive-only (Rx) loops (8Tx/32Rx) was developed and evaluated in comparison to an 8-channel transmit/receive body array (8Tx/Rx) based on meander elements serving as the reference standard. METHODS: Systematic evaluation of the RF array was performed on a body-sized phantom. Body imaging at 7T was performed in 6 volunteers in the body regions pelvis, abdomen, and heart...
April 21, 2018: Medical Physics
https://www.readbyqxmd.com/read/29679374/relationship-between-relative-skeletal-muscle-mass-and-non-alcoholic-fatty-liver-disease-a-7-year-longitudinal-study
#5
Gyuri Kim, Seung-Eun Lee, You-Bin Lee, Ji Eun Jun, Jiyeon Ahn, Ji Cheol Bae, Sang-Man Jin, Kyu Yeon Hur, Jae Hwan Jee, Moon-Kyu Lee, Jae Hyeon Kim
Non-alcoholic fatty liver disease (NAFLD) has been associated with relative skeletal muscle mass in several cross-sectional studies. We explored the impacts of relative skeletal muscle mass and changes in relative muscle mass over time on the development of incident NAFLD or the resolution of baseline NAFLD in a large, longitudinal, population-based 7-year cohort study. We included 12,624 subjects without baseline NAFLD and 2,943 subjects with baseline NAFLD who underwent health check-up examinations. A total of 10,534 subjects without baseline NAFLD and 2,631 subjects with baseline NAFLD were included in analysis of changes in relative skeletal muscle mass over a year...
April 20, 2018: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/29679278/overexpression-of-modified-human-tr%C3%AE-1-suppresses-the-growth-of-hepatocarcinoma-sk-hep1-cells-in-vitro-and-in-xenograft-models
#6
Xiaoxiang Peng, Yuntao Zhou, Yanli Sun, Wei Song, Xiangying Meng, Chunling Zhao, Ronglan Zhao
Association studies suggest that TRβ1 functions as a tumor suppressor. Thyroid hormone receptors (TRs) mediate transcriptional responses through a highly conserved DNA-binding domain (DBD). We previously constructed an artificially modified human TRβ1 (m-TRβ1) via the introduction of a 108-bp exon sequence into the corresponding position of the wild-type human TRβ1 (TRβ1) DBD. Studies confirmed that m-TRβ1 was functional and could inhibit the proliferation of breast cancer MDA-MB-468 cells in vitro. To understand the role of m-TRβ1 in liver tumor development, we adopted a gain-of-function approach by stably expressing TRβ (m-TRβ1 and TRβ1) genes in a human hepatocarcinoma cell line, SK-hep1 (without endogenous TRβ), and then evaluated the effects of the expressed TRβ on cancer cell proliferation, migration, and tumor growth in cell-based studies and xenograft models...
April 20, 2018: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/29679259/dna-methylation-a-potential-source-of-mitochondria-dna-base-mismatch-in-the-development-of-diabetic-retinopathy
#7
Manish Mishra, Renu A Kowluru
In the development of diabetic retinopathy, retinal mitochondria are dysfunctional, and mitochondrial DNA (mtDNA) is damaged with increased base mismatches and hypermethylated cytosines. DNA methylation is also a potential source of mutation, and in diabetes, the noncoding region, the displacement loop (D-loop), experiences more methylation and base mismatches than other regions of the mtDNA. Our aim was to investigate a possible crosstalk between mtDNA methylation and base mismatches in the development of diabetic retinopathy...
April 21, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29679153/stigma-as-a-barrier-to-recognizing-personal-mental-illness-and-seeking-help-a-prospective-study-among-untreated-persons-with-mental-illness
#8
Georg Schomerus, Susanne Stolzenburg, Simone Freitag, Sven Speerforck, Deborah Janowitz, Sara Evans-Lacko, Holger Muehlan, Silke Schmidt
It is unclear to what extent failure to recognize symptoms as potential sign of a mental illness is impeding service use, and how stigmatizing attitudes interfere with this process. In a prospective study, we followed a community sample of 188 currently untreated persons with mental illness (predominantly depression) over 6 months. We examined how lack of knowledge, prejudice and discrimination impacted on self-identification as having a mental illness, perceived need, intention to seek help, and help-seeking, both with respect to primary care (visiting a general practitioner, GP) and specialist care (seeing a mental health professional, MHP)...
April 20, 2018: European Archives of Psychiatry and Clinical Neuroscience
https://www.readbyqxmd.com/read/29679078/fluorophore-labeling-of-a-cell-penetrating-peptide-significantly-alters-the-mode-and-degree-of-biomembrane-interaction
#9
Sofie Fogh Hedegaard, Mohammed Sobhi Derbas, Tania Kjellerup Lind, Marina Robertnova Kasimova, Malene Vinther Christensen, Maria Høtoft Michaelsen, Richard A Campbell, Lene Jorgensen, Henrik Franzyk, Marité Cárdenas, Hanne Mørck Nielsen
The demand for highly efficient macromolecular drugs, used in the treatment of many severe diseases, is continuously increasing. However, the hydrophilic character and large molecular size of these drugs significantly limit their ability to permeate across cellular membranes and thus impede the drugs in reaching their target sites in the body. Cell-penetrating peptides (CPP) have gained attention as promising drug excipients, since they can facilitate drug permeation across cell membranes constituting a major biological barrier...
April 20, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29678760/sub-millimeter-ecog-pitch-in-human-enables-higher-fidelity-cognitive-neural-state-estimation
#10
John Hermiz, Nicholas Rogers, Erik Kaestner, Mehran Ganji, Daniel R Cleary, Bob Carter, David Barba, Shadi Dayeh, Eric Halgren, Vikash Gilja
Electrocorticography (ECoG), electrophysiological recording from the pial surface of the brain, is a critical measurement technique for clinical neurophysiology, basic neurophysiology studies, and demonstrates great promise for the development of neural prosthetic devices for assistive applications and the treatment of neurological disorders. Recent advances in device engineering are poised to enable orders of magnitude increase in the resolution of ECoG without comprised measurement quality. This enhancement in cortical sensing enables the observation of neural dynamics from the cortical surface at the micrometer scale...
April 17, 2018: NeuroImage
https://www.readbyqxmd.com/read/29678531/-restructuring-of-medical-specialist-treatment-using-the-example-of-ambulatory-special-medical-care-asv-taking-a-critical-look-at-its-aims-and-implementation
#11
REVIEW
Robert Dengler, Manfred Cassens
With the GKV-VStG act in 2012, the former section 116b SGB V was transformed into ambulatory special medical care (ASV). This system comprises the diagnosis and therapy of rare or complex diseases which are difficult to treat, in need of a special qualification of doctors, an interdisciplinary cooperation and/or special facilities. For the first time, a uniform regulatory framework was established for the participation of office- as well as hospital-based doctors in ambulatory care. There is no planning of demand or licensed permission...
April 18, 2018: Zeitschrift Für Evidenz, Fortbildung und Qualität Im Gesundheitswesen
https://www.readbyqxmd.com/read/29677819/effects-of-electrolyte-concentration-on-surface-film-formation-on-graphite-in-ethylene-carbonate-based-solutions
#12
Soon-Ki Jeong, Dong-Gui Choi
The physicochemical properties of a surface film generated on a graphite surface were greatly dependent on the concentration of the electrolyte solution. Cyclic voltammetry results obtained using four ethylene carbonate-based solutions of different electrolyte (i.e., LiN(SO2C2F5)2) concentrations showed that the amount of irreversible current used to generate the surface film between 0.8 and 0.1 V decreased upon increasing the electrolyte concentration. Transmission electron microscopy results revealed that the thickness and morphology of the surface film were greatly affected by the concentration of the electrolyte solution...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677807/electrochemical-properties-of-micron-sized-sno-anode-using-a-glyme-based-electrolyte-for-sodium-ion-battery
#13
Huihun Kim, Sang-Won Lee, Ki-Young Lee, Jin-Woo Park, Ho-Suk Ryu, Kwon-Koo Cho, Gyu-Bong Cho, Ki-Won Kim, Jou-Hyeon Ahn, Hyo-Jun Ahn
Tin monoxide (SnO) anodes are promising candidates for use in sodium-ion batteries because of their high theoretical capacities and stable cycle performance. In previous reports, electrodes with excellent performance have been prepared by using nano-sized SnO particles. However, the synthesis of nano-sized SnO particles is complex, time-consuming, and expensive. In this paper, an anode of micron-sized SnO is prepared by using commercial micron-sized SnO particles. The electrode exhibits a reversible capacity of 450 mAh g-1 in the 1st cycle at a current rate of 100 mA g-1...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677687/endothelial-dysfunction-as-a-long-term-effect-of-late-onset-hypertensive-pregnancy-disorders-high-bmi-is-key
#14
L J Alma, C J M De Groot, R X De Menezes, W Hermes, P L Hordijk, I Kovačević
OBJECTIVE: Hypertensive disorders during pregnancy increase cardiovascular risk later in life by 2 to 9-fold. Endothelial activation is one of the underlying mechanisms of cardiovascular risk. Therefore, we decided to investigate endothelial activation in primiparous women, 2.5 years after a hypertensive pregnancy disorder. STUDY DESIGN: Plasma samples were taken from women 2.5 years after gestational hypertension (GH) or late onset preeclampsia (cases) and from women 2...
April 12, 2018: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/29677636/aunp-rf-sensor-an-innovative-application-of-rf-technology-for-sensing-pathogens-electrically-in-liquids-spel-within-the-food-supply-chain
#15
Leann Lerie Matta, Saranraj Karuppuswami, Premjeet Chahal, Evangelyn C Alocilja
Rapid detection techniques of pathogenic bacteria in the liquid food supply chain are of significant research interest due to their pivotal role in preventing foodborne outbreaks, and in maintaining high standards of public health and safety. Milk and dairy products are of particular interest due to their widespread consumption across the globe. In this paper, a biosensor for detecting pathogenic bacteria in milk using dextrin-capped gold nanoparticles (d-AuNP) as labels decoded at microwave frequencies is presented...
April 11, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29677610/a-new-electrochemical-sensor-for-highly-sensitive-and-selective-detection-of-nitrite-in-food-samples-based-on-sonochemical-synthesized-calcium-ferrite-cafe-2-o-4-clusters-modified-screen-printed-carbon-electrode
#16
Paramasivam Balasubramanian, Ramki Settu, Shen-Ming Chen, Tse-Wei Chen, Ganapathi Sharmila
Herein, we report a novel, disposable electrochemical sensor for the detection of nitrite ions in food samples based on the sonochemical synthesized orthorhombic CaFe2 O4 (CFO) clusters modified screen printed electrode. As synthesized CFO clusters were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transformer infrared spectroscopy (FT-IR), Thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and amperometry (i-t)...
April 11, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29677582/maternal-nicotine-exposure-effects-on-adolescent-learning-and-memory-are-abolished-in-alpha-%C3%AE-2-nicotinic-acetylcholine-receptor-null-mutant-mice
#17
Celina Mojica, Yu Bai, Shahrdad Lotfipour
The objective of the current study is to test the hypothesis that the deletion of alpha(α)2* nicotinic acetylcholine receptors (nAChRs) (encoded by the Chrna2 gene) ablate maternal nicotine-induced learning and memory deficits in adolescent mice. We use a pre-exposure-dependent contextual fear conditioning behavioral paradigm that is highly hippocampus-dependent. Adolescent wild type and α2-null mutant offspring are exposed to vehicle or maternal nicotine exposure (200 μg/ml, expressed as base) in the drinking water throughout pregnancy until weaning...
April 9, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29677440/phenotypic-antimicrobial-susceptibility-testing-with-deep-learning-video-microscopy
#18
Hui Yu, Wenwen Jing, Rafael Iriya, Yunze Yang, Karan Syal, Manni Mo, Thomas E Grys, Shelley E Haydel, Shaopeng Wang, Nongjian Tao
Timely determination of antimicrobial susceptibility for a bacterial infection enables precision prescription, shortens treatment time and helps minimize the spread of antibiotic resistant infections. Current antimicrobial susceptibility testing (AST) methods often take several days and thus impede these clinical and health benefits. Here, we present an AST method by imaging freely moving bacterial cells in urine in real time and analyzing the videos with a deep learning algorithm. The deep learning algorithm determines if an antibiotic inhibits a bacterial cell by learning multiple phenotypic features of the cell without the need for defining and quantifying each feature...
April 20, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29677190/a-haplotype-of-three-snps-in-fto-had-a-strong-association-with-body-composition-and-bmi-in-iranian-male-adolescents
#19
Naser Kalantari, Nastaran Keshavarz Mohammadi, Pantea Izadi, Saeid Doaei, Maryam Gholamalizadeh, Hassan Eini-Zinab, Tuire Salonurmi, Shahram Rafieifar, Reza Janipoor, Ghasem Azizi Tabesh
BACKGROUND: Single-nucleotide polymorphisms (SNPs), which are located in the first intron of the FTO gene, are reported to be associated with body weight and the body mass index (BMI). However, their effects on anthropometric measurements in adolescents are poorly understood. OBJECTIVE: This study aimed to investigate the association of three adjacent polymorphisms (rs9930506, rs9930501, & rs9932754) in the FTO gene with anthropometric indices in Iranian adolescent males...
2018: PloS One
https://www.readbyqxmd.com/read/29677129/assessment-of-dry-epidermal-electrodes-for-long-term-electromyography-measurements
#20
Momona Yamagami, Keshia M Peters, Ivana Milovanovic, Irene Kuang, Zeyu Yang, Nanshu Lu, Katherine M Steele
Commercially available electrodes can only provide quality surface electromyography (sEMG) measurements for a limited duration due to user discomfort and signal degradation, but in many applications, collecting sEMG data for a full day or longer is desirable to enhance clinical care. Few studies for long-term sEMG have assessed signal quality of electrodes using clinically relevant tests. The goal of this research was to evaluate flexible, gold-based epidermal sensor system (ESS) electrodes for long-term sEMG recordings...
April 20, 2018: Sensors
keyword
keyword
40475
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"