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https://www.readbyqxmd.com/read/29750865/surface-modification-with-a-catechol-bearing-polypeptide-and-sensing-applications
#1
Eda Aydindogan, Emine Guler Celik, Dilek Odaci Demirkol, Shuhei Yamada, Takeshi Endo, Suna Timur, Yusuf Yagci
A novel catechol bearing polypeptide (CtP) was synthesized and used as a component of electrochemical biosensor involving both enzymatic activity and affinity-based sensing systems. Glucose oxidase (GOx) and Anti-Immunoglobulin G (Anti-IgG) were selected as model biorecognition elements for the selective analysis of glucose and IgG. Step by step surface modifications were followed using various techniques such as cyclic voltammetry (CV) and electrochemical impedance spectrometry (EIS) as well as X-Ray photoelectron spectroscopy (XPS)...
May 11, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29734510/association-between-sarcopenia-and-osteoporosis-in-chronic-liver-disease
#2
Manabu Hayashi, Kazumichi Abe, Masashi Fujita, Ken Okai, Atsushi Takahashi, Hiromasa Ohira
AIM: Sarcopenia and osteoporosis are important complications in chronic liver disease (CLD). The aim of this study was to investigate the relationship between sarcopenia and osteoporosis in patients with CLD. METHODS: We retrospectively investigated the relationship between sarcopenia and osteoporosis in 112 CLD patients (57 males and 55 females), including 40 cirrhotic patients (36%), by measuring the appendicular skeletal muscle mass index (ASMI) using bio-impedance analysis...
May 7, 2018: Hepatology Research: the Official Journal of the Japan Society of Hepatology
https://www.readbyqxmd.com/read/29723519/bio-electrochemical-microelectrode-arrays-for-glutamate-and-electrophysiology-detection-in-hippocampus-of-temporal-lobe-epileptic-rats
#3
Ziyue Li, Yilin Song, Guihua Xiao, Fei Gao, Shengwei Xu, Mixia Wang, Yu Zhang, Fengru Guo, Jie Liu, Yang Xia, Xinxia Cai
Temporal Lobe Epilepsy (TLE) is a chronic neurological disorder, characterized by sudden, repeated and transient central nervous system dysfunction. For better understanding of TLE, bio-nanomodified microelectrode arrays (MEA) are designed, for the achievement of high-quality simultaneous detection of glutamate signals (Glu) and multi-channel electrophysiological signals including action potentials (spikes) and local field potentials (LFPs). The MEA was fabricated by Micro-Electro-Mechanical System fabrication technology and all recording sites were modified with platinum black nano-particles, the average impedance decreased by nearly 90 times...
April 30, 2018: Analytical Biochemistry
https://www.readbyqxmd.com/read/29708859/bioimpedance-patterns-and-bioelectrical-impedance-vector-analysis-biva-of-road-cyclists
#4
Andrea Giorgi, Maurizio Vicini, Luca Pollastri, Erica Lombardi, Emilio Magni, Andrea Andreazzoli, Marco Orsini, Marco Bonifazi, Henry Lukaski, Hannes Gatterer
Bioelectrical impedance vector-analysis (BIVA) describes cell-mass, cell function and hydration status of an individual or a group. The goal of the present investigation was to provide bioelectrical impedance data for 525 male road cyclists (155 professionals, 79 elite, 59 elite-youth, and 232 amateurs) at the time of their optimal performance level. Data were plotted on the resistance-reactance (R-Xc) graph to characterize cyclists group vectors using BIVA. Compared to the general male population, the mean vector position of the road cyclists indicates a higher body cell mass (BCM) and phase angle (p<0...
April 30, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29687239/the-development-of-a-four-electrode-bio-impedance-sensor-for-identification-and-localization-of-deep-pulmonary-nodules
#5
Rasool Baghbani, Mohammad Hassan Moradi, Mohammad Behgam Shadmehr
Identifying and localizing of deep pulmonary nodules are among the main challenges that thoracic surgeons face during operations, particularly in thoracoscopic procedures. To facilitate this, we have tried to introduce a non-invasive and safe method by measuring the lung electrical bio-impedance spectrum with a four-electrode array sensor. To study the feasibility of this method, since any change in the depth or diameter of the nodule in the lung tissue is not practical, we used the finite element modeling of the lung tissue and pulmonary nodule to allow changes in the depth and diameter of the nodule, as well as the distance in between the injection electrodes...
April 23, 2018: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29687198/microbial-fuel-cells-coupling-with-the-three-dimensional-electro-fenton-technique-enhances-the-degradation-of-methyl-orange-in-the-wastewater
#6
Tao Huang, Longfei Liu, Junjun Tao, Lulu Zhou, Shuwen Zhang
The emission of the source effluent of azo dyes has resulted in a serial of environmental problems including of the direct damage of the natural esthetics, the inhibition of the oxygen exchange, the shortage of the photosynthesis, and the reduction of the aquatic flora and fauna. A bioelectrochemical platform (3D-EF-MFCs) combining two-chamber microbial fuel cells and three dimensional electro-Fenton technique were delicately designed and assembled to explore the decolorization, bio-genericity performance of the methyl orange, and the possible biotic-abiotic degradation mechanisms...
April 23, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29675812/a-new-venous-entry-detection-method-based-on-electrical-bio-impedance-sensing
#7
Zhuoqi Cheng, Brian L Davies, Darwin G Caldwell, Leonardo S Mattos
Peripheral intravenous catheterization (PIVC) is frequently required for various medical treatments. Over 1 billion PIVC operations are performed per year in the United States alone. However, this operation is characterized by a very low success rate, especially amongst pediatric patients. Statistics show that only 53% of first PIVC attempts are successful in pediatric patients. Since their veins are small and readily rupture, multiple attempts are commonly required before successfully inserting the catheter into the vein...
April 19, 2018: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29652835/fabrication-of-flexible-microneedle-array-electrodes-for-wearable-bio-signal-recording
#8
Lei Ren, Shujia Xu, Jie Gao, Zi Lin, Zhipeng Chen, Bin Liu, Liang Liang, Lelun Jiang
Laser-direct writing (LDW) and magneto-rheological drawing lithography (MRDL) have been proposed for the fabrication of a flexible microneedle array electrode (MAE) for wearable bio-signal monitoring. Conductive patterns were directly written onto the flexible polyethylene terephthalate (PET) substrate by LDW. The microneedle array was rapidly drawn and formed from the droplets of curable magnetorheological fluid with the assistance of an external magnetic field by MRDL. A flexible MAE can maintain a stable contact interface with curved human skin due to the flexibility of the PET substrate...
April 13, 2018: Sensors
https://www.readbyqxmd.com/read/29650016/evolution-of-computational-models-in-biomodels-database-and-the-physiome-model-repository
#9
Martin Scharm, Tom Gebhardt, Vasundra Touré, Andrea Bagnacani, Ali Salehzadeh-Yazdi, Olaf Wolkenhauer, Dagmar Waltemath
BACKGROUND: A useful model is one that is being (re)used. The development of a successful model does not finish with its publication. During reuse, models are being modified, i.e. expanded, corrected, and refined. Even small changes in the encoding of a model can, however, significantly affect its interpretation. Our motivation for the present study is to identify changes in models and make them transparent and traceable. METHODS: We analysed 13734 models from BioModels Database and the Physiome Model Repository...
April 12, 2018: BMC Systems Biology
https://www.readbyqxmd.com/read/29621176/functionalized-thick-film-impedance-sensors-for-use-in-in-vitro-cell-culture
#10
Heike Bartsch, Martin Baca, Uta Fernekorn, Jens Müller, Andreas Schober, Hartmut Witte
Multi-electrode arrays find application in electrophysiological recordings. The quality of the captured signals depends on the interfacial contact between electrogenic cells and the electronic system. Therefore, it requires reliable low-impedance electrodes. Low-temperature cofired ceramic technology offers a suitable platform for rapid prototyping of biological reactors and can provide both stable fluid supply and integrated bio-hardware interfaces for recordings in electrogenic cell cultures. The 3D assembly of thick film gold electrodes in in vitro bio-reactors has been demonstrated for neuronal recordings...
April 5, 2018: Biosensors
https://www.readbyqxmd.com/read/29607211/development-of-a-multisensory-wearable-system-for-monitoring-cigarette-smoking-behavior-in-free-living-conditions
#11
Masudul Haider Imtiaz, Raul I Ramos-Garcia, Volkan Yusuf Senyurek, Stephen Tiffany, Edward Sazonov
This paper presents the development and validation of a novel multi-sensory wearable system (Personal Automatic Cigarette Tracker v2 or PACT2.0) for monitoring of cigarette smoking in free-living conditions. The contributions of the PACT2.0 system are: (1) the implementation of a complete sensor suite for monitoring of all major behavioral manifestations of cigarette smoking (lighting events, hand-to-mouth gestures, and smoke inhalations); (2) a miniaturization of the sensor hardware to enable its applicability in naturalistic settings; and (3) an introduction of new sensor modalities that may provide additional insight into smoking behavior e...
December 2017: Electronics (Basel)
https://www.readbyqxmd.com/read/29600328/cross-sectional-association-of-dietary-water-intakes-and-sources-and-adiposity-national-adult-nutrition-survey-the-republic-of-ireland
#12
Janette Walton, Laura O'Connor, Albert Flynn
PURPOSE: Drinking (plain) water intake has been associated with weight loss and reducing energy intake in intervention trials. In free-living populations, replacing other beverages with drinking water is associated with reduced obesity risk. However, the association of total water intake and its sources, and body fat distribution remain unevaluated. Thus, the aim of this study was to investigate total water intake and its sources and the association with anthropometric measures. METHODS: Cross-sectional study of 1500 adults aged 18-90 years (Irish National Adult Nutrition Survey, 2008-2010)...
March 29, 2018: European Journal of Nutrition
https://www.readbyqxmd.com/read/29544085/does-obesity-attenuate-the-beneficial-cardiovascular-effects-of-cardiorespiratory-fitness
#13
Karsten Königstein, Denis Infanger, Christopher Klenk, Timo Hinrichs, Anja Rossmeissl, Sandra Baumann, Benjamin Hafner, Henner Hanssen, Arno Schmidt-Trucksäss
BACKGROUND AND AIMS: Higher cardiorespiratory fitness is associated with lower pulse wave velocity and arterial stiffness in normal weight individuals, and this has not been examined in obese individuals. It is unclear whether an altered body composition acts as a modifier of the association between cardiorespiratory fitness and arterial stiffness. We examined the association between peak oxygen uptake and brachial-ankle pulse wave velocity and analysed whether body composition attenuates this association in obese middle-aged individuals...
March 8, 2018: Atherosclerosis
https://www.readbyqxmd.com/read/29541704/actuation-of-chitosan-aptamer-nanobrush-borders-for-pathogen-sensing
#14
Katherine D Hills, Daniela A Oliveira, Nicholas D Cavallaro, Carmen L Gomes, Eric S McLamore
We demonstrate a sensing mechanism for rapid detection of Listeria monocytogenes in food samples using the actuation of chitosan-aptamer nanobrush borders. The bio-inspired soft material and sensing strategy mimic natural symbiotic systems, where low levels of bacteria are selectively captured from complex matrices. To engineer this biomimetic system, we first develop reduced graphene oxide/nanoplatinum (rGO-nPt) electrodes, and characterize the fundamental electrochemical behavior in the presence and absence of chitosan nanobrushes during actuation (pH-stimulated osmotic swelling)...
March 15, 2018: Analyst
https://www.readbyqxmd.com/read/29536047/favoring-the-unfavored-selective-electrochemical-nitrogen-fixation-using-a-reticular-chemistry-approach
#15
Hiang Kwee Lee, Charlynn Sher Lin Koh, Yih Hong Lee, Chong Liu, In Yee Phang, Xuemei Han, Chia-Kuang Tsung, Xing Yi Ling
Electrochemical nitrogen-to-ammonia fixation is emerging as a sustainable strategy to tackle the hydrogen- and energy-intensive operations by Haber-Bosch process for ammonia production. However, current electrochemical nitrogen reduction reaction (NRR) progress is impeded by overwhelming competition from the hydrogen evolution reaction (HER) across all traditional NRR catalysts and the requirement for elevated temperature/pressure. We achieve both excellent NRR selectivity (~90%) and a significant boost to Faradic efficiency by 10 percentage points even at ambient operations by coating a superhydrophobic metal-organic framework (MOF) layer over the NRR electrocatalyst...
March 2018: Science Advances
https://www.readbyqxmd.com/read/29501049/fabrication-of-magnetically-assembled-aptasensing-device-for-label-free-determination-of-aflatoxin-b1-based-on-eis
#16
Chengquan Wang, Jing Qian, Keqi An, Chanchan Ren, Xiaoting Lu, Nan Hao, Qian Liu, Henan Li, Xingyi Huang, Kun Wang
Aflatoxin B1 (AFB1), one of the most common mycotoxins in food matrixes, has been identified as the most toxic contaminant with mutagenic, teratogenic, immunosuppressive, and carcinogenic effects. In this work, a magnetically assembled aptasensing device has been designed for label-free determination of AFB1 by employing a disposable screen-printed carbon electrode (SPCE) covered with a designed polydimethylsiloxane (PDMS) film as the micro electrolytic cell. The magnetically controlled bio-probes were firstly prepared by immobilization of the thiolated aptamers on the Fe3 O4 @Au magnetic beads, which was rapidly assembled on the working electrode of SPCE within 10 s, by using a magnet placed at the opposite side...
June 15, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29493094/engineering-anisotropically-curved-nitrogen-doped-carbon-nanosheets-with-recyclable-binary-flux-for-sodium-ion-storage
#17
Yuxiang Chen, Jie Li, Yanqing Lai, Ming Xu, Junming Li, Peng Wang, Zhian Zhang
As a low-cost substitute of graphene and graphene derivatives, 2D carbon nanosheets are considered to be attractive materials for high-performance electrochemical energy-storage devices. Nevertheless, the lack of cost-effective and green preparation methods still greatly impedes the application of 2D carbon nanosheets in sodium-ion batteries. Herein, an environmental friendly and versatile strategy is proposed to engineer anisotropically curved nitrogen-doped carbon nanosheets (CNCNs) derived from biosources with hydrosoluble and recyclable flux...
April 25, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29492213/low-salt-and-low-calorie-diet-does-not-reduce-more-body-fat-than-same-calorie-diet-a-randomized-controlled-study
#18
Hye Jin Kang, Dae Won Jun, Seung Min Lee, Eun Chul Jang, Yong Kyun Cho
Background: Recent several observational studies have reported that high salt intake is associated with obesity. But it is unclear whether salt intake itself induce obesity or low salt diet can reduce body fat mass. We investigated whether a low salt diet can reduce body weight and fat amount. Matrials and Methods: The randomized, open-label pilot trial was conducted at a single institution. A total of 85 obese people were enrolled. All participants were served meals three times a day, and provided either a low salt diet or control diet with same calorie...
February 2, 2018: Oncotarget
https://www.readbyqxmd.com/read/29482002/sensitive-and-selective-affimer-functionalised-interdigitated-electrode-based-capacitive-biosensor-for-her4-protein-tumour-biomarker-detection
#19
Pavel Zhurauski, Sunil K Arya, Pawan Jolly, Christian Tiede, Darren C Tomlinson, Paul Ko Ferrigno, Pedro Estrela
A novel Affimer-functionalised interdigitated electrode-based capacitive biosensor platform was developed for detection and estimation of Her4, a protein tumour biomarker, in undiluted serum. An anti-Her4 Affimer with a C-terminal cysteine was used to create the bio-recognition layer via self-assembly on gold interdigitated electrodes for the sensor fabrication. Electrochemical impedance spectroscopy (EIS) in the absence of redox markers was used to evaluate the sensor performance by monitoring the changes in capacitance...
June 15, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29460815/phase-angle-is-related-to-outcome-after-icu-admission-an-observational-study
#20
Hanneke Buter, Janny A Veenstra, Matty Koopmans, Christiaan E Boerma
INTRODUCTION: Malnutrition at the time of ICU admission is associated with an increased morbidity and mortality. Malnutrition is most often assessed by a questionnaire but can also be determined with bio-impedance and measurement of phase angle. In a single-centre observational study we compared the percentage of malnutrition in patients admitted to our ICU, according to the Short Nutritional Assessment Questionnaire (SNAQ) with the phase angle measured with bio-impedance. Furthermore, we questioned whether malnutrition is related to outcome parameters...
February 2018: Clinical Nutrition ESPEN
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