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https://www.readbyqxmd.com/read/28550423/tactile-feedback-is-an-effective-instrument-for-the-training-of-grasping-with-a-prosthesis-at-low-and-medium-force-levels
#1
Alessandro Marco De Nunzio, Strahinja Dosen, Sabrina Lemling, Marko Markovic, Meike Annika Schweisfurth, Nan Ge, Bernhard Graimann, Deborah Falla, Dario Farina
Grasping is a complex task routinely performed in an anticipatory (feedforward) manner, where sensory feedback is responsible for learning and updating the internal model of grasp dynamics. This study aims at evaluating whether providing a proportional tactile force feedback during the myoelectric control of a prosthesis facilitates learning a stable internal model of the prosthesis force control. Ten able-bodied subjects controlled a sensorized myoelectric prosthesis performing four blocks of consecutive grasps at three levels of target force (30, 50, and 70%), repeatedly closing the fully opened hand...
May 26, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28550299/microfluidic-isolation-of-circulating-tumor-cell-clusters-by-size-and-asymmetry
#2
Sam H Au, Jon Edd, Amy E Stoddard, Keith H K Wong, Fabio Fachin, Shyamala Maheswaran, Daniel A Haber, Shannon L Stott, Ravi Kapur, Mehmet Toner
Circulating tumor cell clusters (CTC clusters) are potent initiators of metastasis and potentially useful clinical markers for patients with cancer. Although there are numerous devices developed to isolate individual circulating tumor cells from blood, these devices are ineffective at capturing CTC clusters, incapable of separating clusters from single cells and/or cause cluster damage or dissociation during processing. The only device currently able to specifically isolate CTC clusters from single CTCs and blood cells relies on the batch immobilization of clusters onto micropillars which necessitates long residence times and causes damage to clusters during release...
May 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28550019/measuring-ability-to-assess-claims-about-treatment-effects-a-latent-trait-analysis-of-items-from-the-claim-evaluation-tools-database-using-rasch-modelling
#3
Astrid Austvoll-Dahlgren, Øystein Guttersrud, Allen Nsangi, Daniel Semakula, Andrew D Oxman
BACKGROUND: The Claim Evaluation Tools database contains multiple-choice items for measuring people's ability to apply the key concepts they need to know to be able to assess treatment claims. We assessed items from the database using Rasch analysis to develop an outcome measure to be used in two randomised trials in Uganda. Rasch analysis is a form of psychometric testing relying on Item Response Theory. It is a dynamic way of developing outcome measures that are valid and reliable. OBJECTIVES: To assess the validity, reliability and responsiveness of 88 items addressing 22 key concepts using Rasch analysis...
May 25, 2017: BMJ Open
https://www.readbyqxmd.com/read/28540146/-combined-diagnostic-tool-application-to-a-retrospective-series-of-patients-undergoing-total-joint-revision-surgery
#4
Enrico Gallazzi, Lorenzo Drago, Andrea Baldini, Ian Stockley, David A George, Sara Scarponi, Carlo L Romanò
Background: Differentiating between septic and aseptic joint prosthesis may be challenging, since no single test is able to confirm or rule out infection. The choice and interpretation of the panel of tests performed in any case often relies on empirical evaluation and poorly validated scores. The "Combined Diagnostic Tool (CDT)" App, a smartphone application for iOS, was developed to allow to automatically calculate the probability of having a of periprosthetic joint infection, on the basis of the relative sensitivity and specificity of the positive and negative diagnostic tests performed in any given patient...
2017: J Bone Jt Infect
https://www.readbyqxmd.com/read/28539663/modelling-farm-to-farm-disease-transmission-through-personnel-movements-from-visits-to-contacts-and-back
#5
Gianluigi Rossi, Rebecca L Smith, Stefano Pongolini, Luca Bolzoni
Infectious diseases in livestock can be transmitted through fomites: objects able to convey infectious agents. Between-farm spread of infections through fomites is mostly due to indirect contacts generated by on-farm visits of personnel that can carry pathogens on their clothes, equipment, or vehicles. However, data on farm visitors are often difficult to obtain because of the heterogeneity of their nature and privacy issues. Thus, models simulating disease spread between farms usually rely on strong assumptions about the contribution of indirect contacts on infection spread...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28536199/active-depinning-of-bacterial-droplets-the-collective-surfing-of-bacillus-subtilis
#6
Marc Hennes, Julien Tailleur, Gaëlle Charron, Adrian Daerr
How systems are endowed with migration capacity is a fascinating question with implications ranging from the design of novel active systems to the control of microbial populations. Bacteria, which can be found in a variety of environments, have developed among the richest set of locomotion mechanisms both at the microscopic and collective levels. Here, we uncover, experimentally, a mode of collective bacterial motility in humid environment through the depinning of bacterial droplets. Although capillary forces are notoriously enormous at the bacterial scale, even capable of pinning water droplets of millimetric size on inclined surfaces, we show that bacteria are able to harness a variety of mechanisms to unpin contact lines, hence inducing a collective slipping of the colony across the surface...
May 23, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28534415/sequence-and-structure-dual-dependent-interaction-between-small-molecules-and-dna-for-the-detection-of-residual-silver-ions-in-as-prepared-silver-nanomaterials
#7
Zhaoyin Wang, Jian Zhao, Zijun Li, Jianchun Bao, Zhihui Dai
Investigations on interaction between small molecules and DNA are the basis of designing advanced bioanalytical systems. We herein propose a novel interaction between heterocyclic aromatic compounds (HACs) and single-stranded DNA (ssDNA). Taking methylene blue (MB) as a typical HAC, it is found that MB can interact with cytosine (C)-rich ssDNA in an enthalpy-driven process. The interaction between MB and C-rich ssDNA is sequence and structure dual-dependent: at least three consecutive C and single-stranded structure are necessary...
May 23, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28533086/spatio-temporal-pattern-of-neuronal-differentiation-in-the-drosophila-visual-system-a-user-s-guide-to-the-dynamic-morphology-of-the-developing-optic-lobe
#8
Kathy T Ngo, Ingrid Andrade, Volker Hartenstein
Visual information processing in animals with large image forming eyes is carried out in highly structured retinotopically ordered neuropils. Visual neuropils in Drosophila form the optic lobe, which consists of four serially arranged major subdivisions; the lamina, medulla, lobula and lobula plate; the latter three of these are further subdivided into multiple layers. The visual neuropils are formed by more than 100 different cell types, distributed and interconnected in an invariant highly regular pattern...
May 19, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28530204/in-bed-vital-signs-monitoring-system-based-on-unobtrusive-magnetic-induction-method-with-a-concentric-planar-gradiometer
#9
Hadiseh Mahdavi, Javier Rosell-Ferrer
SIGNIFICANCE: Unobtrusive vital signs monitoring is of major importance for various medical areas such as detection and treatment of sleep disorders, monitoring neonates and burned victims, home health care and smart home applications and wearables among others. Such applications call for monitoring methods in which the patient's natural state is less interfered with. An ideal device would be non-invasive, minimally restrictive, robust enough to compensate movements of the patients, and would operate without relying on the patient's full cooperation...
June 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28529473/complete-locked-in-and-locked-in-patients-command-following-assessment-and-communication-with-vibro-tactile-p300-and-motor-imagery-brain-computer-interface-tools
#10
Christoph Guger, Rossella Spataro, Brendan Z Allison, Alexander Heilinger, Rupert Ortner, Woosang Cho, Vincenzo La Bella
Many patients with locked-in syndrome (LIS) or complete locked-in syndrome (CLIS) also need brain-computer interface (BCI) platforms that do not rely on visual stimuli and are easy to use. We investigate command following and communication functions of mindBEAGLE with 9 LIS, 3 CLIS patients and three healthy controls. This tests were done with vibro-tactile stimulation with 2 or 3 stimulators (VT2 and VT3 mode) and with motor imagery (MI) paradigms. In VT2 the stimulators are fixed on the left and right wrist and the participant has the task to count the stimuli on the target hand in order to elicit a P300 response...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28526238/ric8a-is-essential-for-the-organisation-of-actin-cytoskeleton-and-cell-matrix-interaction
#11
Katrin Ruisu, Riho Meier, Keiu Kask, Tambet Tõnissoo, Teet Velling, Margus Pooga
RIC8A functions as a chaperone and guanine nucleotide exchange factor for a subset of G protein α subunits. Multiple G protein subunits mediate various signalling events that regulate cell adhesion and migration and the involvement of RIC8A in some of these processes has been demonstrated. We have previously shown that the deficiency of RIC8A causes a failure in mouse gastrulation and neurogenesis - major events in embryogenesis that rely on proper association of cells with the extracellular matrix (ECM) and involve active cell migration...
May 16, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28518087/multimer-page-a-method-for-capturing-and-resolving-protein-complexes-in-biological-samples
#12
Tyler Rhinesmith, Bryan A Killinger, Akhil Sharma, Anna Moszczynska
There are many well-developed methods for purifying and studying single proteins and peptides. However, most cellular functions are carried out by networks of interacting protein complexes, which are often difficult to investigate because their binding is non-covalent and easily perturbed by purification techniques. This work describes a method of stabilizing and separating native protein complexes from unmodified tissue using two-dimensional polyacrylamide gel electrophoresis. Tissue lysate is loaded onto a non-denaturing blue-native polyacrylamide gel, then an electric current is applied until the protein migrates a short distance into the gel...
May 5, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28515573/problematisations-of-complexity-on-the-notion-and-production-of-diverse-complexities-in-healthcare-interventions-and-evaluations
#13
Tineke Broer, Roland Bal, Martyn Pickersgill
Within the literature on the evaluation of health (policy) interventions, complexity is a much-debated issue. In particular, many claim that so-called 'complex interventions' pose different challenges to evaluation studies than apparently 'simple interventions' do. Distinct ways of doing evaluation entail particular ontologies and epistemologies of complexity. They differ in terms of whether they define complexity as a quantitative trait of interventions, whether they see evaluation as part of or outside the intervention, and whether complexity can be regarded as an emergent property of the intervention and its evaluation...
April 3, 2017: Science As Culture
https://www.readbyqxmd.com/read/28514910/value-based-healthcare-measurement-as-a-context-for-organizational-learning
#14
Patrik Nordin, Anna-Aurora Kork, Inka Koskela
Purpose The purpose of this paper is to shed light on the potential of organizational learning for developing effectiveness of care. Value-based healthcare measurement recognizes patient value as a driver for improving health outcomes at the societal and individual levels. By using the action learning method, this paper examines the phases of organizational learning in a private healthcare organization that has developed a novel Big Data screening tool for the treatment of patients with type 2 diabetes mellitus (DM2)...
May 2, 2017: Leadership in Health Services
https://www.readbyqxmd.com/read/28514082/universal-label-free-in-process-quantification-of-influenza-virus-like-particles
#15
Sofia B Carvalho, Mafalda G Moleirinho, David Wheatley, John Welsh, René Gantier, Paula M Alves, Cristina Peixoto, Manuel J T Carrondo
Virus-like particles (VLPs) are becoming established as vaccines, in particular for influenza pandemics, increasing the interest in the development of VLPs manufacturing bioprocess. However, for complex VLPs, the analytical tools used for quantification are not yet able to keep up with the bioprocess progress. Currently, quantification for Influenza relies on traditional methods: hemagglutination assay or Single Radial Immunodiffusion. These analytical technologies are time-consuming, cumbersome, and not supportive of efficient downstream process development and monitoring...
May 17, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28513702/stretchable-impedance-sensor-for-mammalian-cell-proliferation-measurements
#16
Xudong Zhang, William Wang, Fang Li, Ioana Voiculescu
This paper presents the fabrication and testing of a novel stretchable electric cell-substrate impedance sensing (ECIS) lab on a chip device. This is the first time that ECIS electrodes were fabricated on a stretchable polydimethylsiloxane (PDMS) substrate and ECIS measurements were performed on mammalian cells exposed to cyclic strain. The stretchable ECIS biosensors simulate in vitro the dynamic environment of organisms, such as pulsation, bending and stretching, which enables investigations on cell behavior that undergoes mechanical stimuli in biological tissue...
May 17, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28512434/evaluation-of-a-rapid-anisotropic-model-for-ecg-simulation
#17
Simone Pezzuto, Peter Kal'avský, Mark Potse, Frits W Prinzen, Angelo Auricchio, Rolf Krause
State-of-the-art cardiac electrophysiology models that are able to deliver physiologically motivated activation maps and electrocardiograms (ECGs) can only be solved on high-performance computing architectures. This makes it nearly impossible to adopt such models in clinical practice. ECG imaging tools typically rely on simplified models, but these neglect the anisotropic electric conductivity of the tissue in the forward problem. Moreover, their results are often confined to the heart-torso interface. We propose a forward model that fully accounts for the anisotropic tissue conductivity and produces the standard 12-lead ECG in a few seconds...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28507285/multivariate-eeg-analyses-support-high-resolution-tracking-of-feature-based-attentional-selection
#18
Johannes Jacobus Fahrenfort, Anna Grubert, Christian N L Olivers, Martin Eimer
The primary electrophysiological marker of feature-based selection is the N2pc, a lateralized posterior negativity emerging around 180-200 ms. As it relies on hemispheric differences, its ability to discriminate the locus of focal attention is severely limited. Here we demonstrate that multivariate analyses of raw EEG data provide a much more fine-grained spatial profile of feature-based target selection. When training a pattern classifier to determine target position from EEG, we were able to decode target positions on the vertical midline, which cannot be achieved using standard N2pc methodology...
May 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28501905/investigation-of-pain-mechanisms-by-calcium-imaging-approaches
#19
REVIEW
Michael Anderson, Qin Zheng, Xinzhong Dong
Due to the complex circuitry and plethora of cell types involved in somatosensation, it is becoming increasingly important to be able to observe cellular activity at the population level. In addition, since cells rely on an intricate variety of extracellular factors, it is important to strive to maintain the physiological environment. Many electrophysiological techniques require the implementation of artificially-produced physiological environments and it can be difficult to assess the activity of many cells simultaneously...
May 13, 2017: Neuroscience Bulletin
https://www.readbyqxmd.com/read/28497696/chemical-imaging-by-dissolution-analysis-localized-kinetics-of-dissolution-behavior-to-provide-two-dimensional-chemical-mapping-and-tomographic-imaging-on-a-nanoscale
#20
Michael Reading, Muhammad U Ghori, D Robert Brown, Leigh T Fleming, Milan D Antonijevic, David B Grandy, Douglas J Hourston, Mo Song, Barbara R Conway
A new approach to achieving chemical mapping on a nanoscale is described that can provide 2D and tomographic images of surface and near-surface structure. The method comprises dissolving material from the surface of the sample by applying a series of aliquots of solvent, then analyzing their contents after removing them; in between exposures, the surface is imaged with atomic force microscopy. This technique relies on being able to compensate for any drift between images by use of software. It was applied to a blend of two polymers, PMMA and PS...
May 24, 2017: Analytical Chemistry
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