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Bio impedance

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https://www.readbyqxmd.com/read/28211673/capillary-microfluidics-assembled-virus-like-particle-bio-nano-receptor-interfaces-for-label-free-biosensing
#1
Faheng Zang, Konstantinos Gerasopoulos, Adam D Brown, James N Culver, Reza Ghodssi
In this paper, a capillary microfluidics-integrated sensor system is developed for rapid assembly of bionanoreceptor interfaces on-chip and label-free biosensing. Genetically engineered Tobacco mosaic virus (TMV) virus-like particle (VLP), displaying thousands copies of identical receptor peptides FLAG-tags, are utilized as nanoceptors for antibody sensing. Controlled and accelerated assembly of VLP receptor layer on impedance sensor has been achieved using capillary effect and surface evaporation from an open-channel capillary microfluidic system...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28199774/sarcopenia-predicts-minimal-hepatic-encephalopathy-in-patients-with-liver-cirrhosis
#2
Tatsunori Hanai, Makoto Shiraki, Satoshi Watanabe, Takahiro Kochi, Kenji Imai, Atsushi Suetsugu, Koji Takai, Hisataka Moriwaki, Masahito Shimizu
AIM: Minimal hepatic encephalopathy (MHE) and sarcopenia impair the health-related quality of life and prognosis in patients with liver cirrhosis; however, the relationship between MHE and sarcopenia remains unclear. The aim of this study was to investigate their relationship and to identify the predictors of MHE in cirrhotic patients. METHODS: This retrospective study evaluated 120 cirrhotic patients who were tested for MHE and sarcopenia. MHE was diagnosed by using the computer-aided neuropsychiatric test...
February 15, 2017: Hepatology Research: the Official Journal of the Japan Society of Hepatology
https://www.readbyqxmd.com/read/28176677/predicting-burst-pressure-of-radiofrequency-induced-colorectal-anastomosis-by-bio-impedance-measurement
#3
Lingxi Zhao, Yu Zhou, Chengli Song, Zhigang Wang, Alfred Cuschieri
The present study investigates the relationship between bio-impedance and burst pressure of colorectal anastomosis created by radiofrequency (RF)-induced tissue fusion. Colorectal anastomosis were created with ex vivo porcine colorectal segments, during which 5 levels of compression pressure were applied by a custom-made bipolar prototype, with 5 replicate experiments at each compression pressure. Instant anastomotic tensile strength was assessed by burst pressure. Bio-impedance of fused tissue was measured by Impedance Analyzer across frequency that 100 Hz to 3 MHz...
February 8, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28147485/hydrodynamic-effects-on-biofilms-at-the-biointerface-using-a-microfluidic-electrochemical-cell-case-study-of-pseudomonas-sp
#4
Mir Pouyan Zarabadi, François Paquet-Mercier, Steve J Charette, Jesse Greener
The anchoring biofilm layer is expected to exhibit a different response to environmental stresses than for portions in the bulk, due to the protection from other strata and the proximity to the attachment surface. The effect of hydrodynamic stress on surface-adhered biofilm layers was tested using a specially designed microfluidic bio flow cell with an embedded three-electrode detection system. In situ electrochemical impedance spectroscopy (EIS) measurements of biocapacitance and bioresistance of Pseudomonas sp...
February 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28113349/active-electrodes-for-wearable-eeg-acquisition-review-and-electronics-design-methodology
#5
Jiawei Xu, Srinjoy Mitra, Chris Van Hoof, Refet Yazicioglu, Kofi A A Makinwa
Active Electrodes (AE), i.e. electrodes with built-in readout circuitry, are increasingly being implemented in wearable healthcare and lifestyle applications due to AE's robustness to environmental interference. An AE locally amplifies and buffers μV-level EEG signals before driving any cabling. The low output impedance of an AE mitigates cable motion artifacts thus enabling the use of high-impedance dry electrodes for greater user comfort. However, developing a wearable EEG system, with medical grade signal quality on noise, electrode offset tolerance, common-mode rejection ratio (CMRR), input impedance and power dissipation, remains a challenging task...
January 20, 2017: IEEE Reviews in Biomedical Engineering
https://www.readbyqxmd.com/read/28113133/boronic-acid-vs-folic-acid-a-comparison-of-the-bio-recognition-performances-by-impedimetric-cytosensors-based-on-ferrocene-cored-dendrimer
#6
Muamer Dervisevic, Mehmet Şenel, Tugba Sagir, Sevim Isik
A comparative study is reported where folic acid (FA) and boronic acid (BA) based cytosensors and their analytical performances in cancer cell detection were analyzed by using electrochemical impedance spectroscopy (EIS) method. Cytosensors were fabricated using self-assembled monolayer principle by modifying Au electrode with cysteamine (Cys) and immobilization of ferrocene cored polyamidiamine dendrimers second generation (Fc-PAMAM (G2)), after which electrodes were modified with FA and BA. Au/Fc-PAMAM(G2)/FA and Au/Fc-PAMAM(G2)/BA based cytosensors showed extremely good analytical performances in cancer cell detection with linear range of 1×10(2) to 1×10(6)cellsml(-1), detection limit of 20cellsml(-1) with incubation time of 20min for FA based electrode, and for BA based electrode detection limit was 28cellsml(-1) with incubation time of 10min...
January 15, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28110171/long-term-usability-and-bio-integration-of-polyimide-based-intra-neural-stimulating-electrodes
#7
S Wurth, M Capogrosso, S Raspopovic, J Gandar, G Federici, N Kinany, A Cutrone, A Piersigilli, N Pavlova, R Guiet, G Taverni, J Rigosa, P Shkorbatova, X Navarro, Q Barraud, G Courtine, S Micera
Stimulation of peripheral nerves has transiently restored lost sensation and has the potential to alleviate motor deficits. However, incomplete characterization of the long-term usability and bio-integration of intra-neural implants has restricted their use for clinical applications. Here, we conducted a longitudinal assessment of the selectivity, stability, functionality, and biocompatibility of polyimide-based intra-neural implants that were inserted in the sciatic nerve of twenty-three healthy adult rats for up to six months...
January 13, 2017: Biomaterials
https://www.readbyqxmd.com/read/28095849/simulated-case-management-of-home-telemonitoring-to-assess-the-impact-of-different-alert-algorithms-on-work-load-and-clinical-decisions
#8
Illapha Cuba Gyllensten, Amanda Crundall-Goode, Ronald M Aarts, Kevin M Goode
BACKGROUND: Home telemonitoring (HTM) of chronic heart failure (HF) promises to improve care by timely indications when a patient's condition is worsening. Simple rules of sudden weight change have been demonstrated to generate many alerts with poor sensitivity. Trend alert algorithms and bio-impedance (a more sensitive marker of fluid change), should produce fewer false alerts and reduce workload. However, comparisons between such approaches on the decisions made and the time spent reviewing alerts has not been studied...
January 17, 2017: BMC Medical Informatics and Decision Making
https://www.readbyqxmd.com/read/28053662/development-of-a-genome-editing-crispr-cas9-system-in-thermophilic-fungal-myceliophthora-species-and-its-application-to-hyper-cellulase-production-strain-engineering
#9
Qian Liu, Ranran Gao, Jingen Li, Liangcai Lin, Junqi Zhao, Wenliang Sun, Chaoguang Tian
BACKGROUND: Over the past 3 years, the CRISPR/Cas9 system has revolutionized the field of genome engineering. However, its application has not yet been validated in thermophilic fungi. Myceliophthora thermophila, an important thermophilic biomass-degrading fungus, has attracted industrial interest for the production of efficient thermostable enzymes. Genetic manipulation of Myceliophthora is crucial for metabolic engineering and to unravel the mechanism of lignocellulose deconstruction...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28045439/design-and-development-of-non-contact-bio-potential-electrodes-for-pervasive-health-monitoring-applications
#10
Anthony J Portelli, Slawomir J Nasuto
For the advent of pervasive bio-potential monitoring, it will be necessary to utilize a combination of cheap, quick to apply, low-noise electrodes and compact electronics with wireless technologies. Once available, all electrical activity resulting from the processes of the human body could be actively and constantly monitored without the need for cumbersome application and maintenance. This could significantly improve the early diagnosis of a range of different conditions in high-risk individuals, opening the possibility for new treatments and interventions as conditions develop...
January 1, 2017: Biosensors
https://www.readbyqxmd.com/read/28029106/differences-between-graphene-and-graphene-oxide-in-gelatin-based-systems-for-transient-biodegradable-energy-storage-applications
#11
G Landi, A Sorrentino, S Iannace, H C Neitzert
A comparison between graphene flakes and graphene oxide as filler in gelatin based systems for low-cost transient biodegradable energy storage applications has been carried out. The two bio-composites have been prepared and characterized by rheological measurements, cyclic voltammetry measurements, chronopotentiometry measurements and impedance spectroscopy. Differences in dielectric and mechanical properties have been correlated to the different structural organizations determinate by the hydrophobic/hydrophilic character of the used filler...
February 3, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28024633/novel-impedimetric-dopamine-biosensor-based-on-boronic-acid-functional-polythiophene-modified-electrodes
#12
Muamer Dervisevic, Mehmet Senel, Emre Cevik
In this study we report a new, simple and first impedimetric biosensor based on 3-Thienyl boronic acid for dopamine detection. Biosensor electrode preparation is 1min long by simple electro-polymerization of 3-Thienyl boronic acid and copolymer Thiophene P(TBA0.50Th0.50). Strong interaction between dopamine and thin layer of boronic acid has provided bio-sensing electrode high selectivity and stability, linear range of 7.8 to 125μM, and detection limit of 0.3μM. Characterization and optimization studies were conducted using electrochemical impedance spectroscopy (EIS) and cyclic voltammogram (CV)...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27941227/comparison-of-cardiac-magnetic-resonance-imaging-and-bio-impedance-spectroscopy-for-the-assessment-of-fluid-displacement-induced-by-external-leg-compression
#13
Salvatore Saporito, Silviu Dovancescu, Ingeborg H F Herold, Harrie C M van den Bosch, Hans C van Assen, Ronald M Aarts, Hendrikus H M Korsten, Massimo Mischi
Heart failure is marked by frequent hospital admissions, often as a consequence of pulmonary congestion. Current gold standard techniques for thoracic fluid measurement require invasive heamodynamic access and therefore they are not suitable for continuous monitoring. Changes in thoracic impedance (TI) may enable non-invasive early detection of congestion and prevention of unplanned hospitalizations. However, the usefulness of TI to assess thoracic fluid status is limited by inter-subject variability and by the lack of reliable normalization methods...
January 2017: Physiological Measurement
https://www.readbyqxmd.com/read/27916866/relationship-between-soft-drink-consumption-and-obesity-in-9-11-years-old-children-in-a-multi-national-study
#14
Peter T Katzmarzyk, Stephanie T Broyles, Catherine M Champagne, Jean-Philippe Chaput, Mikael Fogelholm, Gang Hu, Rebecca Kuriyan, Anura Kurpad, Estelle V Lambert, Jose Maia, Victor Matsudo, Timothy Olds, Vincent Onywera, Olga L Sarmiento, Martyn Standage, Mark S Tremblay, Catrine Tudor-Locke, Pei Zhao
The purpose of this study was to determine the association between regular (sugar containing) and diet (artificially sweetened) soft drink consumption and obesity in children from 12 countries ranging in levels of economic and human development. The sample included 6162 children aged 9-11 years. Information on soft drink consumption was obtained using a food frequency questionnaire. Percentage body fat (%BF) was estimated by bio-electrical impedance analysis, body mass index (BMI) z-scores were computed using World Health Organization reference data, and obesity was defined as a BMI > +2 standard deviations (SD)...
November 30, 2016: Nutrients
https://www.readbyqxmd.com/read/27892802/longitudinal-changes-and-correlations-of-bioimpedance-and-anthropometric-measurements-in-pregnancy-simple-possible-bed-side-tools-to-assess-pregnancy-evolution
#15
Gabriele Piuri, Enrico Ferrazzi, Camilla Bulfoni, Luciana Mastricci, Daniela Di Martino, Attilio Francesco Speciani
PURPOSE: The aim of this study was to assess longitudinal changes of bioimpedance analysis compared with anthropometric measurements in low-risk pregnant woman recruited in the first trimester and to observe possible differences in these indices in women who developed high-risk pregnancies. MATERIALS AND METHODS: Bioimpedance indices for the three trimesters of pregnancies were calculated separately for uneventful pregnancies delivered of newborns > the 10th centile...
December 14, 2016: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/27875525/precision-medicine-in-cancer-challenges-and-recommendations-from-an-eu-funded-cervical-cancer-biobanking-study
#16
Sanne Samuels, Balazs Balint, Heiko von der Leyen, Philippe Hupé, Leanne de Koning, Choumouss Kamoun, Windy Luscap-Rondof, Ulrike Wittkop, Ksenia Bagrintseva, Marina Popovic, Atttila Kereszt, Els Berns, Gemma G Kenter, Ekaterina S Jordanova, Maud Kamal, Susy Scholl
BACKGROUND: Cervical cancer (CC) remains a leading cause of gynaecological cancer-related mortality worldwide. CC pathogenesis is triggered when human papillomavirus (HPV) inserts into the genome, resulting in tumour suppressor gene inactivation and oncogene activation. Collecting tumour and blood samples is critical for identifying these genetic alterations. METHODS: BIO-RAIDs is the first prospective molecular profiling clinical study to include a substantial biobanking effort that used uniform high-quality standards and control of samples...
December 6, 2016: British Journal of Cancer
https://www.readbyqxmd.com/read/27812588/scaling-down-for-a-broader-understanding-of-underwater-adhesives-a-case-for-the-caulobacter-crescentus-holdfast
#17
REVIEW
Alex Nyarko, Hazel Barton, Ali Dhinojwala
The adhesion of two materials in the presence of water is greatly impeded by a boundary layer of water between the adhesive and the adherend, resulting in adhesive failure of most synthetic adhesives; however, life evolved first in water and there are many aquatic organisms that have to overcome this impediment to underwater adhesion. For example, multicellular aquatic organisms like the mussel, sandcastle worm and the caddisfly larva employ well-studied adhesive mechanisms for sticking in the presence of water...
November 16, 2016: Soft Matter
https://www.readbyqxmd.com/read/27809470/hypoxia-mimicking-nanofibrous-scaffolds-promote-endogenous-bone-regeneration
#18
Qingqing Yao, Yangxi Liu, Jianning Tao, Keith M Baumgarten, Hongli Sun
Utilizing biomimetic materials to potentiate endogenous cell growth or signaling is superior to relying on exogenous cells or signals for bone formation. Desferoxamine (DFO), which is a hypoxia-mimetic agent that chelates iron (Fe(3+)), mimics hypoxia to encourage bone healing. However, high cytotoxicity, off-target effects, and the short half-life of DFO have significantly impeded its further applications. We mitigated these side effects by locally immobilizing DFO onto a gelatin nanofibrous (GF) scaffold that retained DFO's ability to chelate Fe(3+)...
November 30, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27806471/variations-in-vitamin-d-receptor-gene-adiposity-phenotypes-and-metabolic-profile-in-overweight-women-with-hypovitaminosis-d
#19
Samira Ebrahimof, Hamid Zand, Sakineh Shab-Bidar, Marjan Zarif Yeganeh, Farzaneh Jahangiri, Katayoun Pourvali, Maryam Sadat Daneshpour, Mehdi Hedayati
BACKGROUND: The possible role of vitamin D receptor (VDR) genotypes in determining adiposity phenotypes and cardiovascular risk factors has been suggested previously. The aim of this study was to evaluate the associations of the VDR gene variants with adiposity phenotypes and metabolic profile in Iranian overweight women with hypovitaminos is D. METHODS: Three VDR variants including FokI (rs2228570), BsmI (rs1544410) and rs757343 were detected using PCR-sequencing...
June 30, 2016: Global Journal of Health Science
https://www.readbyqxmd.com/read/27770942/an-electrical-bio-chip-to-transfer-and-detect-electromagnetic-stimulation-on-the-cells-based-on-vertically-aligned-carbon-nanotubes
#20
Saeed Rafizadeh-Tafti, Mohammad Hossein Haqiqatkhah, Mehrdad Saviz, Mohsen Janmaleki, Reza Faraji Dana, Somayeh Zanganeh, Mohammad Abdolahad
A highly sensitive impedimetric bio-chip based on vertically aligned multiwall carbon nanotubes (VAMWCNTs), was applied in direct interaction with lung cancer cells. Our tool provided both inducing and monitoring the bioelectrical changes in the cells initiated by electromagnetic (EM) wave stimulation. EM wave of 940MHz frequency with different intensities was used. Here, wave ablation might accumulate electrical charge on the tips of nanotubes penetrated into cell's membrane. The charge might induce ionic exchanges into the cell and cause alterations in electrical states of the membrane...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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