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https://www.readbyqxmd.com/read/28640952/label-free-dynamic-mass-redistribution-and-bio-impedance-methods-for-drug-discovery
#1
Manuel Grundmann
Label-free biosensors are increasingly employed in drug discovery. Cell-based biosensors provide valuable insights into the biological consequences of exposing cells and tissues to chemical agents and the underlying molecular mechanisms associated with these effects. Optical biosensors based on the detection of dynamic mass redistribution (DMR) and impedance biosensors using cellular dielectric spectroscopy (CDS) capture changes of the cytoskeleton of living cells in real time. Because signal transduction correlates with changes in cell morphology, DMR and CDS biosensors are exquisitely suited for recording integrated cell responses in an unbiased, yet pathway-specific manner without the use of labels that may interfere with cell function...
June 22, 2017: Current Protocols in Pharmacology
https://www.readbyqxmd.com/read/28638469/dual-ph-sensitive-charge-reversal-nanocomplex-for-tumor-targeted-drug-delivery-with-enhanced-anticancer-activity
#2
Qing Zhou, Yilin Hou, Li Zhang, Jianlin Wang, Youbei Qiao, Songyan Guo, Li Fan, Tiehong Yang, Lin Zhu, Hong Wu
Poly(β-L-malic acid) (PMLA), a natural aliphatic polyester, has been proven to be a promising carrier for anti-cancer drugs. In spite of excellent bio-compatibility, the application of PMLA as the drug carrier for cancer therapy is limited by its low cellular uptake efficiency. The strong negative charge of PMLA impedes its uptake by cancer cells because of the electrostatic repulsion. In this study, a dual pH-sensitive charge-reversal PMLA-based nanocomplex (PMLA-PEI-DOX-TAT@PEG-DMMA) was developed for effective tumor-targeted drug delivery, enhanced cellular uptake, and intracellular drug release...
2017: Theranostics
https://www.readbyqxmd.com/read/28636007/analysis-of-association-of-gene-variants-with-obesity-traits-in-new-zealand-european-children-at-6-years-of-age
#3
Mohanraj Krishnan, John M D Thompson, Edwin A Mitchell, Rinki Murphy, Lesley M E McCowan, Andrew N Shelling, G On Behalf Of The Children Of Scope Study Group
Childhood obesity is a public health problem, which is associated with a long-term increased risk of cardiovascular disease and premature mortality. Several gene variants have previously been identified that have provided novel insights into biological factors that contribute to the development of obesity. As obesity tracks through childhood into adulthood, identification of the genetic factors for obesity in early life is important. The objective of this study was to identify putative associations between genetic variants and obesity traits in children at 6 years of age...
June 21, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28631060/estimating-the-size-of-the-msm-population-in-metro-vancouver-canada-using-multiple-methods-and-diverse-data-sources
#4
Ashleigh J Rich, Nathan J Lachowsky, Paul Sereda, Zishan Cui, Jason Wong, Stanley Wong, Jody Jollimore, Henry Fisher Raymond, Travis Salway Hottes, Eric A Roth, Robert S Hogg, David M Moore
Men who have sex with men (MSM) are disproportionately affected by HIV globally, regionally in Canada, and locally in Vancouver. Lack of reliable population size estimates of MSM impedes effective implementation of health care services and limits our understanding of the HIV epidemic. We estimated the population size of MSM residing in Metro Vancouver drawing on four data sources: the Canadian Community Health Survey (CCHS), a cross-sectional bio-behavioural MSM survey, HIV testing services data from sexually transmitted infection (STI) clinics serving MSM, and online social networking site Facebook...
June 19, 2017: Journal of Urban Health: Bulletin of the New York Academy of Medicine
https://www.readbyqxmd.com/read/28629098/carbon-nanotube-ensembled-hybrid-nanocomposite-electrode-for-direct-electrochemical-detection-of-epinephrine-in-pharmaceutical-tablets-and-urine
#5
K Koteshwara Reddy, M Satyanarayana, K Yugender Goud, K Vengatajalabathy Gobi, Hern Kim
An efficient electrochemical sensor for selective detection of the neurotransmitter, epinephrine (Epn), has been fabricated with the aid of a functionalized multiwall carbon nanotube-chitosan biopolymer nanocomposite (Chit-fCNT) electrode. Multiwall carbon nanotubes (CNT) were successfully functionalized with the aid of nitric acid and confirmed by the Raman spectral data. Functionalized carbon nanotubes (fCNT) were dispersed in chitosan solution and the resulting bio-nanocomposite was used for the fabrication of sensor surface by drop and cast method...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629075/fabrication-of-chitosan-au-tio2-nanotube-based-dry-electrodes-for-electroencephalography-recording
#6
Yanjuan Song, Penghai Li, Mingji Li, Hongji Li, Cuiping Li, Dazhi Sun, Baohe Yang
In this paper, we describe a method for fabricating dry electrodes for use in recording electroencephalograms (EEGs), which are based on the use of chitosan (Ch), gold (Au) particles, and titanium dioxide (TiO2) nanotube arrays deposited on titanium (Ti) thin sheets. The samples were characterized by scanning electron microscopy, X-ray diffraction, electrochemical impedance spectroscopy, and EEG signal collection. The TiO2 nanotube arrays were grown on the Ti thin sheet by an electrochemical anodic oxidation method...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28621757/impact-of-virtual-touch-quantification-in-acoustic-radiation-force-impulse-for-skeletal-muscle-mass-loss-in-chronic-liver-diseases
#7
Hiroki Nishikawa, Takashi Nishimura, Hirayuki Enomoto, Yoshinori Iwata, Akio Ishii, Yuho Miyamoto, Noriko Ishii, Yukihisa Yuri, Ryo Takata, Kunihiro Hasegawa, Chikage Nakano, Kazunori Yoh, Nobuhiro Aizawa, Yoshiyuki Sakai, Naoto Ikeda, Tomoyuki Takashima, Shuhei Nishiguchi, Hiroko Iijima
BACKGROUND AND AIMS: We sought to clarify the relationship between virtual touch quantification (VTQ) in acoustic radiation force impulse and skeletal muscle mass as assessed by bio-electronic impedance analysis in patients with chronic liver diseases (CLDs, n = 468, 222 males and 246 females, median age = 62 years). PATIENTS AND METHODS: Decreased skeletal muscle index (D-SMI) was defined as skeletal muscle index (SMI) <7.0 kg/m² for males and as SMI <5...
June 16, 2017: Nutrients
https://www.readbyqxmd.com/read/28575985/in-vitro-biodegradation-and-corrosion-assisted-cracking-of-a-coated-magnesium-alloy-in-modified-simulated-body-fluid
#8
Sajjad Jafari, R K Singh Raman
A calcium phosphate coating was directly synthesized on AZ91D magnesium (Mg) alloy. Resistance of this coating to corrosion in a modified-simulated body fluid (m-SBF) was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Mechanical properties of the bare and coated alloy were investigated using slow strain rate tensile (SSRT) and fatigue testing in air and m-SBF. Very little is reported in the literature on human-body-fluid-assisted cracking of Mg alloys, viz., resistance to corrosion fatigue (CF) and stress corrosion cracking (SCC)...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28575241/reduced-fitness-and-physical-functioning-are-long-term-sequelae-after-curative-treatment-for-esophageal-cancer-a-matched-control-study
#9
J A Gannon, E M Guinan, S L Doyle, P Beddy, J V Reynolds, J Hussey
Reduced physical functioning is common following resections for esophageal cancer; however, objective data on physical performance outcomes in this cohort are rare. The aim of this study was to assess the physical performance and health related quality of life (HRQOL) of disease free survivors and compare findings in a case matched noncancer control group. Twenty-five males (mean (±SD) aged 63 (±6) years) who were over 6 months postesophagectomy and disease-free were compared with 25 controls (60 ± 6 years)...
August 1, 2017: Diseases of the Esophagus: Official Journal of the International Society for Diseases of the Esophagus
https://www.readbyqxmd.com/read/28561596/higher-exercise-intensity-delays-postexercise-recovery-of-impedance-derived-cardiac-sympathetic-activity
#10
Scott Michael, Ollie Jay, Kenneth S Graham, Glen M Davis
Systolic time intervals (STIs) provide noninvasive insights into cardiac sympathetic neural activity (cSNA). As the effect of exercise intensity on postexercise STI recovery is unclear, this study investigated the STI recovery profile after different exercise intensities. Eleven healthy males cycled for 8 min at 3 separate intensities: LOW (40%-45%), MOD (75%-80%), and HIGH (90%-95%) of heart-rate (HR) reserve. Bio-impedance cardiography was used to assess STIs - primarily pre-ejection period (PEP; inversely correlated with cSNA), as well as left ventricular ejection time (LVET) and PEP:LVET - during 10 min seated recovery immediately postexercise...
May 31, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28549455/inter-act-prevention-of-pregnancy-complications-through-an-e-health-driven-interpregnancy-lifestyle-intervention-study-protocol-of-a-multicentre-randomised-controlled-trial
#11
Annick Bogaerts, Lieveke Ameye, Margriet Bijlholt, Kelly Amuli, Dorine Heynickx, Roland Devlieger
BACKGROUND: Excessive maternal pre-pregnancy and gestational weight gain are related to pregnancy- and birth outcomes. The interpregnancy time window offers a unique opportunity to intervene in order to acquire a healthy lifestyle before the start of a new pregnancy. METHODS: INTER-ACT is an e-health driven multicentre randomised controlled intervention trial targeting women at high risk of pregnancy- and birth related complications. Eligible women are recruited for the study at day 2 or 3 postpartum...
May 26, 2017: BMC Pregnancy and Childbirth
https://www.readbyqxmd.com/read/28532901/long-term-surveillance-of-zinc-implant-in-murine-artery-surprisingly-steady-biocorrosion-rate
#12
Adam J Drelich, Shan Zhao, Roger J Guillory, Jaroslaw W Drelich, Jeremy Goldman
Metallic zinc implanted into the abdominal aorta of rats out to 6months has been demonstrated to degrade while avoiding responses commonly associated with the restenosis of vascular implants. However, major questions remain regarding whether a zinc implant would ultimately passivate through the production of stable corrosion products or via a cell mediated fibrous encapsulation process that prevents the diffusion of critical reactants and products at the metal surface. Here, we have conducted clinically relevant long term in vivo studies in order to characterize late stage zinc implant biocorrosion behavior and products to address these critical questions...
May 19, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28530206/16th-international-conference-on-electrical-bio-impedance-and-17th-international-conference-on-biomedical-applications-of-electrical-impedance-tomography-eit
#13
Richard Bayford, Stig Ollmar
No abstract text is available yet for this article.
May 22, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28523252/prevalence-of-sarcopenia-in-the-world-a-systematic-review-and-meta-analysis-of-general-population-studies
#14
REVIEW
Gita Shafiee, Abbasali Keshtkar, Akbar Soltani, Zeinab Ahadi, Bagher Larijani, Ramin Heshmat
BACKGROUND: Sarcopenia, an age-related decline in muscle mass and function, is one of the most important health problems in elderly with a high rate of adverse outcomes. However, several studies have investigated the prevalence of sarcopenia in the world, the results have been inconsistent. The current systematic review and meta- analysis study was conducted to estimate the overall prevalence of sarcopenia in both genders in different regions of the world. METHODS: Electronic databases, including MEDLINE (via PubMed), SCOPUS and Web of Science were searched between January 2009 and December 2016...
2017: Journal of Diabetes and Metabolic Disorders
https://www.readbyqxmd.com/read/28489550/a-fully-integrated-wireless-soc-for-motor-function-recovery-after-spinal-cord-injury
#15
Yi-Kai Lo, Yen-Cheng Kuan, Stanislav Culaclii, Brian Kim, Po-Min Wang, Chih-Wei Chang, Jonathan A Massachi, Minji Zhu, Kuanfu Chen, Parag Gad, V Reggie Edgerton, Wentai Liu
This paper presents a wirelessly powered, fully integrated system-on-a-chip (SoC) supporting 160-channel stimulation, 16-channel recording, and 48-channel bio-impedance characterization to enable partial motor function recovery through epidural spinal cord electrical stimulation. A wireless transceiver is designed to support quasi full-duplex data telemetry at a data rate of 2 Mb/s. Furthermore, a unique in situ bio-impedance characterization scheme based on time-domain analysis is implemented to derive the Randles cell electrode model of the electrode-electrolyte interface...
June 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28485143/charge-directed-immobilization-of-bacteriophage-on-nanostructured-electrode-for-whole-cell-electrochemical-biosensors
#16
Yan Zhou, Abhijit Marar, Peter Kner, Ramaraja P Ramasamy
A new type of carbon nanotube (CNT)-based impedimetric biosensing method has been developed for rapid and selective detection of live bacterial cells. A proof-of-concept study was conducted using T2 bacteriophage-based biosensors for electrochemical detection of Escherichia coli B. The T2 bacteriophage (virus) served as the biorecognition element, which was immobilized on polyethylenimine (PEI)-functionalized carbon nanotube transducer on glassy carbon electrode. Charge-directed, orientated immobilization of bacteriophage particles on carbon nanotubes was achieved through covalent linkage of phage capsid onto the carbon nanotubes...
June 6, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28482488/direct-bioactive-ceramics-coating-via-reactive-growing-integration-layer-method-on-%C3%AE-ti-alloy
#17
Chi-Huang Huang, Rong-Sheng Chen, Masahiro Yoshimura
This paper demonstrates Ca-P-rich bio-ceramic and hydroxyapatite (HA) coatings formed directly from the solution of calcium acetate (CA) and sodium dihydrogen phosphate (SDP) on α-Ti-alloy substrates by Growing Integration Layer (GIL) technology under DC power supply. The composition of the α-Ti-alloy was Ti7Cu5Sn. The GIL coated films formed in 30min time with different voltages applied had porous and rough ceramic surfaces. They consisted mostly of various oxides like rutile, anatase, and calcium phosphates (including hydroxyapatite) that reduce corrosion rate and increase biocompatibility...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28480853/-contemporary-approach-to-diagnosis-of-subclinical-heart-failure
#18
A Azaraksh, G Ivanov, N Bulanova, L Stazhadze, M Nikolaeva, V Vostrikov
Treatment of congestive heart failure (CHF) remains one of the challenging problems in cardiology. In recent years, the method of multifrequency bio-impendancemetry is used in patients with CHF for the assessment of water imbalance and determination of its severity. The aim of the study was to determine the diagnostic capabilities of bio-impendancemetry in evaluation of the early manifestations of CHF. The study included 92 healthy individuals, and 335 patients who were hospitalized in the cardiology department with NYHA I-II functional class (FC) of chronic CHF...
March 2017: Georgian Medical News
https://www.readbyqxmd.com/read/28470316/top-down-fabrication-meets-bottom-up-synthesis-for-nanoelectronic-barcoding-of-microparticles
#19
Pengfei Xie, Xinnan Cao, Zhongtian Lin, Mehdi Javanmard
Traditional optical and plasmonic techniques for barcoding of micro-particles for multiplexed bioassays are generally high in throughput, however bulky instrumentation is often required for performing readout. Electrical impedance based detection allows for ultra-compact instrumentation footprint necessary for wearable devices, however to date, the lack of ability to electronically barcode micro-particles has been a long standing bottleneck towards enabling multiplexed electronic biomarker assays. Nanoelectronic barcoding, which to the best of our knowledge is the first impedance based solution for micro-particle barcoding, works by forming tunable nano-capacitors on the surface of micro-spheres, effectively modulating the frequency dependent dielectric properties of the spheres allowing one bead barcode to be distinguished from another...
May 31, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28460640/physical-performance-and-protein-energy-wasting-in-patients-treated-with-nocturnal-haemodialysis-compared-to-conventional-haemodialysis-protocol-of-the-diaprifit-study
#20
Manouk Dam, Floor Neelemaat, Trudeke Struijk-Wielinga, Peter J Weijs, Brigit C van Jaarsveld
BACKGROUND: Poor physical performance and protein-energy wasting (PEW) are health issues of major concern in haemodialysis patients. The conventional haemodialysis (CHD) regime, three times per week 3-5 h, is subject of discussion because of high morbidity and mortality rates. When patients switch from CHD to longer dialysis sessions, i.e. nocturnal haemodialysis (NHD), improvement in protein intake and increase in body weight is seen. However, it is unclear whether physical performance and more important aspects of PEW, such as body composition, improve as well...
May 1, 2017: BMC Nephrology
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