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Bio impedance

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https://www.readbyqxmd.com/read/28433920/proteomic-analysis-of-sockeye-salmon-serum-as-a-tool-for-biomarker-discovery-and-new-insight-into-the-sublethal-toxicity-of-diluted-bitumen
#1
Sarah L Alderman, Laura A Dindia, Christopher J Kennedy, Anthony P Farrell, Todd E Gillis
Pipelines carrying diluted bitumen (dilbit) from Canada's oil sands traverse North America, including the freshwater habitat of Pacific salmon, posing a risk of environmental release and aquatic exposure. Swimming performance is impacted in juvenile sockeye (Oncorhynchus nerka) exposed to dilbit; therefore biomarkers of dilbit exposure will be valuable for monitoring at-risk salmon stocks. This study characterized changes in the serum proteome of sockeye exposed to a sub-lethal and environmentally relevant concentration of dilbit using isobaric tags for relative and absolute quantitation (iTRAQ), and included a range of experimental conditions to permit identification of biomarkers that are robust across time (1 and 4wk) and exercise level (at rest and following a swim test)...
April 12, 2017: Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics
https://www.readbyqxmd.com/read/28381339/association-of-mortality-and-phase-angle-measured-by-different-bioelectrical-impedance-analysis-bia-devices
#2
Laurence Genton, François R Herrmann, Adrian Spörri, Christophe E Graf
PURPOSE: A high phase angle measured by the Nutriguard(®) bioelectrical impedance analysis device is associated with a reduced mortality risk in older people. This retrospective study aims to analyze whether this association persists with the other devices that have been used in our hospital. METHODS: This study encompasses all people 65 yrs and older who underwent a phase angle measurement between 1990 and 2011 at the Geneva University Hospitals, with the RJL-101(®) (RJL Systems), Xitron 4000B(®) (Xitron Technologies), Eugedia(®) (Eugédia-Spengler) and Bio-Z(®) (Spengler)...
March 23, 2017: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/28376036/evaluation-of-skeletal-muscle-function-in-lung-transplant-candidates
#3
Dmitry Rozenberg, Lianne G Singer, Margaret Herridge, Roger Goldstein, Lisa Wickerson, Noori A Chowdhury, Sunita Mathur
BACKGROUND: Lung transplantation (LTx) is offered to older and more complex patients who may be at higher risk of skeletal muscle dysfunction, but the clinical implications of this remain uncertain. The study aims were to characterize deficits in skeletal muscle mass, strength and physical performance and examine the associations of these deficits with clinical outcomes. METHODS: Fifty LTx candidates (58% male, 59 ± 9 years) were prospectively evaluated for skeletal muscle deficits: muscle mass using bio-electrical impedance, quadriceps, respiratory muscle and handgrip strength, and physical performance with the Short Physical Performance Battery...
April 3, 2017: Transplantation
https://www.readbyqxmd.com/read/28371518/clinical-utility-of-bioimpedance-analysis-in-liver-cirrhosis
#4
Hiroki Nishikawa, Hirayuki Enomoto, Yoshinori Iwata, Takashi Nishimura, Hiroko Iijima, Shuhei Nishiguchi
PURPOSE: To examine the impact of muscle mass depletion (MMD) as determined by data in bio{\hyphen}impedance analysis (BIA) in liver cirrhosis (LC) patients (n{\equal}382, 204 in male and 178 in female) on survival and to validate the utility of cutoff values in BIA recommended from current recommendations. PATIENTS AND METHODS: MMD was defined as patients with skeletal muscle mass index (SMI) using BIA {\lt}7.0 cm(2) {\sol}m(2) for male and {\lt}5.7 cm(2) {\sol}m(2) for female based on current recommendations...
March 31, 2017: Journal of Hepato-biliary-pancreatic Sciences
https://www.readbyqxmd.com/read/28349621/-it-feels-sometimes-like-my-house-has-burnt-down-but-i-can-see-the-sky-a-qualitative-study-exploring-patients-views-of-cognitive-behavioural-therapy-for-chronic-fatigue-syndrome
#5
Federica Picariello, Sheila Ali, Caroline Foubister, Trudie Chalder
OBJECTIVES: Cognitive behavioural therapy (CBT) is currently a first-line treatment for chronic fatigue syndrome (CFS). Even though the results from trials are promising, there is variability in patient outcomes. The aim of this study was to explore the experiences of patients with CFS who undertook CBT at a specialist service for CFS. DESIGN: This was a qualitative study. METHODS: Thirteen patients with CFS, approaching the end of CBT, participated in semi-structured interviews...
March 28, 2017: British Journal of Health Psychology
https://www.readbyqxmd.com/read/28323272/constipation-predominant-irritable-bowel-syndrome-females-have-normal-colonic-barrier-and-secretory-function
#6
Stephanie A Peters, Shoko Edogawa, Wendy J Sundt, Roy B Dyer, Daniel A Dalenberg, Amelia Mazzone, Ravinder J Singh, Natalie Moses, Thomas C Smyrk, Christopher Weber, David R Linden, Wallace K MacNaughton, Jerrold R Turner, Michael Camilleri, David A Katzka, Gianrico Farrugia, Madhusudan Grover
OBJECTIVES: The objective of this study was to determine whether constipation-predominant irritable bowel syndrome (IBS-C) is associated with changes in intestinal barrier and secretory function. METHODS: A total of 19 IBS-C patients and 18 healthy volunteers (all females) underwent saccharide excretion assay (0.1 g (13)C mannitol and 1 g lactulose), measurements of duodenal and colonic mucosal barrier (transmucosal resistance (TMR), macromolecular and Escherichia coli Bio-Particle translocation), mucosal secretion (basal and acetylcholine (Ach)-evoked short-circuit current (Isc)), in vivo duodenal mucosal impedance, circulating endotoxins, and colonic tight junction gene expression...
March 21, 2017: American Journal of Gastroenterology
https://www.readbyqxmd.com/read/28319904/sensitivity-enhancement-of-graphene-zinc-oxide-nanocomposite-based-electrochemical-impedance-genosensor-for-single-stranded-rna-detection
#7
Sze Shin Low, Hwei-San Loh, Jian Sheng Boey, Poi Sim Khiew, Wee Siong Chiu, Michelle T T Tan
An efficient electrochemical impedance genosensing platform has been constructed based on graphene/zinc oxide nanocomposite produced via a facile and green approach. Highly pristine graphene was synthesised from graphite through liquid phase sonication and then mixed with zinc acetate hexahydrate for the synthesis of graphene/zinc oxide nanocomposite by solvothermal growth. The as-synthesised graphene/zinc oxide nanocomposite was characterised with scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and X-ray diffractometry (XRD) to evaluate its morphology, crystallinity, composition and purity...
February 27, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28299684/bacterial-detection-using-peptide-based-platform-and-impedance-spectroscopy
#8
Hashem Etayash, Thomas Thundat, Kamaljit Kaur
Antimicrobial peptides have the ability to function as bio-recognition elements in the detection of bacteria. For instance, we showed that Leucocin A, an antimicrobial peptide from class IIa bacteriocins, binds gram-positive Listeria monocytogenes with higher affinity than other gram-positive bacteria like S. aureus, L. innocua, and E. faecalis. The binding was detected using impedance spectroscopy when Leucocin A immobilized on impedance electrodes binds bacteria from a sample. Here we highlight the strength of utilizing Leucocin A as a bio-recognition probe in biosensor platforms and provide details on its application in real-time bacterial detection using electrochemical impedance spectroscopy...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28295907/the-effects-of-short-term-omission-of-daily-medication-on-the-pathophysiology-of-heart-failure
#9
Silviu Dovancescu, Pierpaolo Pellicori, Thato Mabote, Azam Torabi, Andrew L Clark, John G F Cleland
AIMS: Pharmacological therapies for heart failure (HF) aim to improve congestion, symptoms, and prognosis. Failing to take medication is a potential cause of worsening HF. Characterizing the effects of short-term medication omission could inform the development of better technologies and strategies to detect and interpret the reasons for worsening HF. We examined the effect of planned HF medication omission for 48 h on weight, echocardiograms, transthoracic bio-impedance, and plasma concentrations of NT-proBNP...
March 15, 2017: European Journal of Heart Failure
https://www.readbyqxmd.com/read/28286655/metabolic-endotoxaemia-related-inflammation-is-associated-with-hypogonadism-in-overweight-men
#10
Kelton Tremellen, Natalie McPhee, Karma Pearce
BACKGROUND: Obesity is associated with both impaired testosterone production and a chronic state of low grade inflammation. Previously it was believed that this inflammation was mediated by a decline in the immunosuppressive action of testosterone. However, more recently an alternative hypothesis (GELDING theory) has suggested that inflammation originating from the passage of intestinal bacteria into the circulation (metabolic endotoxaemia) may actually be the cause of impaired testicular function in obese men...
2017: Basic and Clinical Andrology
https://www.readbyqxmd.com/read/28273880/5-v-compatible-two-axis-pzt-driven-mems-scanning-mirror-with-mechanical-leverage-structure-for-miniature-lidar-application
#11
Liangchen Ye, Gaofei Zhang, Zheng You
The MEMS (Micro-Electronical Mechanical System) scanning mirror is an optical MEMS device that can scan laser beams across one or two dimensions. MEMS scanning mirrors can be applied in a variety of applications, such as laser display, bio-medical imaging and Light Detection and Ranging (LiDAR). These commercial applications have recently created a great demand for low-driving-voltage and low-power MEMS mirrors. However, no reported two-axis MEMS scanning mirror is available for usage in a universal supplying voltage such as 5 V...
March 5, 2017: Sensors
https://www.readbyqxmd.com/read/28269688/wrist-worn-heartbeat-monitoring-system-based-on-bio-impedance-analysis
#12
Jia Xu, Xiaomeng Gao, Alexander Lee, Shuhei Yamada, Ehsan Yavari, Victor Lubecke, Olga Boric-Lubecke
In this paper, a bio-impedance analysis (BIA) based wrist-worn heartbeat monitoring system is proposed. The system is able to estimate heart rate from a subject's wrist with only four electrodes. The design is achieved with a standard BIA device and off-the-shelf components for signal conditioning. The measured heartbeat-related impedance signal is compared with a reference heart rate signal obtained from piezoelectric finger pulse transducer. The BIA results agree with the reference, which validates the feasibility of the proposed system...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268939/towards-an-implantable-bio-sensor-platform-for-continuous-real-time-monitoring-of-anti-epileptic-drugs
#13
Abbas Hammoud, Ahmad Chamseddine, Dang K Nguyen, Mohamad Sawan
The need of continuous real-time monitoring device for in-vivo drug level detection has been widely articulated lately. Such monitoring could guide drug posology and timing of intake, detect low or high drug levels, in order to take adequate measures, and give clinicians a valuable window into patients' health and their response to therapeutics. This paper presents a novel implantable bio-sensor based on impedance measurement capable of continuously monitoring various antiepileptic drug levels. This portable point-of-care microsystem replaces large and stationary conventional macrosystems, and is a one of a kind system designed with an array of electrodes to monitor various anti-epileptic drugs rather than one drug...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28266832/enhancement-of-interface-characteristics-of-neural-probe-based-on-graphene-zno-nanowires-and-conducting-polymer-pedot
#14
Mingyu Ryu, Jae Hoon Yang, Yumi Ahn, Minkyung Sim, Kyung Hwa Lee, Kyungsoo Kim, Taeju Lee, Seung-Jun Yoo, So Yeun Kim, Cheil Moon, Minkyu Je, Ji-Woong Choi, Youngu Lee, Jae Eun Jang
In the growing field of brain-machine interface (BMI), the interface between electrodes and neural tissues plays an important role in the recording and stimulation of neural signals. To minimize tissue damage while retaining high sensitivity, a flexible and a smaller electrode with low impedance is required. However, it is a major challenge to reduce electrode size while retaining the conductive characteristics of the electrode. In addition, the mechanical mismatch between stiff electrodes and soft tissues creates damaging reactive tissue responses...
March 29, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28262322/biochemical-and-anthropometric-correlates-of-bio-electrical-impedance-parameters-in-severely-malnourished-children-a-cross-sectional-study
#15
Tsinuel Girma, Anne-Louise Hother Nielsen, Pernille Kæstel, Alemseged Abdissa, Kim F Michaelsen, Henrik Friis, Jonathan C K Wells
INTRODUCTION: Despite expanding use of bio-impedance (BI), little is known about its pathophysiologic significance and biological correlates OBJECTIVE: Determine correlations of BI parameters with anthropometry and biomarkers of electrolyte homeostasis, inflammation and liver function in children with severe acute malnutrition (SAM). METHODS: We studied Ethiopian children with SAM (mid-arm circumference <11·0 cm or weight-for-height <70% of the NCHS growth reference median and/or nutritional oedema) at hospitalization...
February 24, 2017: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/28249189/thermodynamics-of-binding-interactions-between-extracellular-polymeric-substances-and-heavy-metals-by-isothermal-titration-microcalorimetry
#16
Peng Yan, Jia-Shuai Xia, You-Peng Chen, Zhi-Ping Liu, Jin-Song Guo, Yu Shen, Cheng-Cheng Zhang, Jing Wang
Extracellular polymeric substances (EPS) play a crucial role in heavy metal bio-adsorption using activated sludge, but the interaction mechanism between heavy metals and EPS remains unclear. Isothermal titration calorimetry was employed to illuminate the mechanism in this study. The results indicate that binding between heavy metals and EPS is spontaneous and driven mainly by enthalpy change. Extracellular proteins in EPS are major participants in the binding process. Environmental conditions have significant impact on the adsorption performance...
February 20, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28239758/acellular-mouse-kidney-ecm-can-be-used-as-a-three-dimensional-substrate-to-test-the-differentiation-potential-of-embryonic-stem-cell-derived-renal-progenitors
#17
Manpreet Sambi, Theresa Chow, Jennifer Whiteley, Mira Li, Shawn Chua, Vanessa Raileanu, Ian M Rogers
The development of strategies for tissue regeneration and bio-artificial organ development is based on our understanding of embryogenesis. Differentiation protocols attempt to recapitulate the signaling modalities of gastrulation and organogenesis, coupled with cell selection regimens to isolate the cells of choice. This strategy is impeded by the lack of optimal in vitro culture systems since traditional culture systems do not allow for the three-dimensional interaction between cells and the extracellular matrix...
February 27, 2017: Stem Cell Reviews
https://www.readbyqxmd.com/read/28227949/wrist-worn-heartbeat-monitoring-system-based-on-bio-impedance-analysis
#18
Jia Xu, Xiaomeng Gao, Alexander Lee, Shuhei Yamada, Ehsan Yavari, Victor Lubecke, Olga Boric-Lubecke, Jia Xu, Xiaomeng Gao, Alexander Lee, Shuhei Yamada, Ehsan Yavari, Victor Lubecke, Olga Boric-Lubecke, Olga Boric-Lubecke, Xiaomeng Gao, Shuhei Yamada, Ehsan Yavari, Jia Xu, Victor Lubecke, Alexander Lee
In this paper, a bio-impedance analysis (BIA) based wrist-worn heartbeat monitoring system is proposed. The system is able to estimate heart rate from a subject's wrist with only four electrodes. The design is achieved with a standard BIA device and off-the-shelf components for signal conditioning. The measured heartbeat-related impedance signal is compared with a reference heart rate signal obtained from piezoelectric finger pulse transducer. The BIA results agree with the reference, which validates the feasibility of the proposed system...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227145/towards-an-implantable-bio-sensor-platform-for-continuous-real-time-monitoring-of-anti-epileptic-drugs
#19
Abbas Hammoud, Ahmad Chamseddine, Dang K Nguyen, Mohamad Sawan, Abbas Hammoud, Ahmad Chamseddine, Dang K Nguyen, Mohamad Sawan, Mohamad Sawan, Abbas Hammoud, Dang K Nguyen
The need of continuous real-time monitoring device for in-vivo drug level detection has been widely articulated lately. Such monitoring could guide drug posology and timing of intake, detect low or high drug levels, in order to take adequate measures, and give clinicians a valuable window into patients' health and their response to therapeutics. This paper presents a novel implantable bio-sensor based on impedance measurement capable of continuously monitoring various antiepileptic drug levels. This portable point-of-care microsystem replaces large and stationary conventional macrosystems, and is a one of a kind system designed with an array of electrodes to monitor various anti-epileptic drugs rather than one drug...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225090/proton-transfer-dynamics-dictate-quinone-speciation-at-lipid-modified-electrodes
#20
Edmund C M Tse, Christopher J Barile, Ying Li, Steven C Zimmerman, Ali Hosseini, Andrew A Gewirth
Proton-coupled electron transfer (PCET) reactions are ubiquitous in biochemistry and alternative energy schemes. Natural enzymes utilize quinones in proton transfer chains and energy conversion processes. Here, we utilize a bio-inspired hybrid bilayer membrane system to control the reaction mechanism of a quinone molecule covalently bound to an electrode surface. In particular, by impeding proton access to the quinone moiety, we change the reaction pathway from a PCET process to a pure electron transfer step...
February 22, 2017: Physical Chemistry Chemical Physics: PCCP
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