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https://www.readbyqxmd.com/read/29353324/stromalized-microreactor-supports-murine-hematopoietic-progenitor-enrichment
#1
Danika Khong, Matthew Li, Amy Singleton, Ling-Yee Chin, Biju Parekkadan
There is an emerging need to process, expand, and even genetically engineer hematopoietic stem and progenitor cells (HSPCs) prior to administration for blood reconstitution therapy. A closed-system and automated solution for ex vivo HSC processing can improve adoption and standardize processing techniques. Here, we report a recirculating flow bioreactor where HSCs are stabilized and enriched for short-term processing by indirect fibroblast feeder coculture. Mouse 3 T3 fibroblasts were seeded on the extraluminal membrane surface of a hollow fiber micro-bioreactor and were found to support HSPC cell number compared to unsupported BMCs...
January 20, 2018: Biomedical Microdevices
https://www.readbyqxmd.com/read/29352532/the-impact-of-severe-mental-disorders-and-psychotropic-medications-on-sexual-health-and-its-implications-for-clinical-management
#2
Angel L Montejo, Laura Montejo, David S Baldwin
Sexual dysfunction often accompanies severe psychiatric illness and can be due to both the mental disorder itself and the use of psychotropic treatments. Many sexual symptoms resolve as the mental state improves, but treatment-related sexual adverse events tend to persist over time, and are unfortunately under-recognized by clinicians and scarcely investigated in clinical trials. Treatment-emergent sexual dysfunction adversely affects quality of life and may contribute to reduce treatment adherence. There are important differences between the various compounds in the incidence of adverse sexual effects, associated with differences in mechanisms of action...
February 2018: World Psychiatry: Official Journal of the World Psychiatric Association (WPA)
https://www.readbyqxmd.com/read/29352114/binding-of-nufip2-to-roquin-promotes-recognition-and-regulation-of-icos-mrna
#3
Nina Rehage, Elena Davydova, Christine Conrad, Gesine Behrens, Andreas Maiser, Jenny E Stehklein, Sven Brenner, Juliane Klein, Aicha Jeridi, Anne Hoffmann, Eunhae Lee, Umberto Dianzani, Rob Willemsen, Regina Feederle, Kristin Reiche, Jörg Hackermüller, Heinrich Leonhardt, Sonia Sharma, Dierk Niessing, Vigo Heissmeyer
The ubiquitously expressed RNA-binding proteins Roquin-1 and Roquin-2 are essential for appropriate immune cell function and postnatal survival of mice. Roquin proteins repress target mRNAs by recognizing secondary structures in their 3'-UTRs and by inducing mRNA decay. However, it is unknown if other cellular proteins contribute to target control. To identify cofactors of Roquin, we used RNA interference to screen ~1500 genes involved in RNA-binding or mRNA degradation, and identified NUFIP2 as a cofactor of Roquin-induced mRNA decay...
January 19, 2018: Nature Communications
https://www.readbyqxmd.com/read/29352028/the-mysteries-of-remote-memory
#4
REVIEW
Zimbul Albo, Johannes Gräff
Long-lasting memories form the basis of our identity as individuals and lie central in shaping future behaviours that guide survival. Surprisingly, however, our current knowledge of how such memories are stored in the brain and retrieved, as well as the dynamics of the circuits involved, remains scarce despite seminal technical and experimental breakthroughs in recent years. Traditionally, it has been proposed that, over time, information initially learnt in the hippocampus is stored in distributed cortical networks...
March 19, 2018: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/29349907/accelerated-hydrogen-evolution-kinetics-on-nife-layered-double-hydroxide-electrocatalysts-by-tailoring-water-dissociation-active-sites
#5
Guangbo Chen, Tao Wang, Jian Zhang, Pan Liu, Hanjun Sun, Xiaodong Zhuang, Mingwei Chen, Xinliang Feng
Owing to its earth abundance, low kinetic overpotential, and superior stability, NiFe-layered double hydroxide (NiFe-LDH) has emerged as a promising electrocatalyst for catalyzing water splitting, especially oxygen evolution reaction (OER), in alkaline solutions. Unfortunately, as a result of extremely sluggish water dissociation kinetics (Volmer step), hydrogen evolution reaction (HER) activity of the NiFe-LDH is rather poor in alkaline environment. Here a novel strategy is demonstrated for substantially accelerating the hydrogen evolution kinetics of the NiFe-LDH by partially substituting Fe atoms with Ru...
January 19, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29347775/mode-locking-in-systems-of-globally-coupled-phase-oscillators
#6
Sebastian Eydam, Matthias Wolfrum
We investigate the dynamics of a Kuramoto-type system of globally coupled phase oscillators with equidistant natural frequencies and a coupling strength below the synchronization threshold. It turns out that in such cases one can observe a stable regime of sharp pulses in the mean field amplitude with a pulsation frequency given by spacing of the natural frequencies. This resembles a process known as mode locking in lasers and relies on the emergence of a phase relation induced by the nonlinear coupling. We discuss the role of the first and second harmonics in the phase-interaction function for the stability of the pulsations and present various bifurcating dynamical regimes such as periodically and chaotically modulated mode locking, transitions to phase turbulence, and intermittency...
November 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347743/flat-bands-and-compactons-in-mechanical-lattices
#7
Nathan Perchikov, O V Gendelman
Local configurational symmetry in lattice structures may give rise to stationary, compact solutions, even in the absence of disorder and nonlinearity. These compact solutions are related to the existence of flat dispersion curves (bands). Nonlinearity can destabilize such compactons. One common flat-band-generating system is the one-dimensional cross-stitch model, in which compactons were shown to exist for the photonic lattice with Kerr nonlinearity. The compactons exist there already in the linear regime and are not generally destructed by that nonlinearity...
November 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347731/delay-induced-wave-instabilities-in-single-species-reaction-diffusion-systems
#8
Andereas Otto, Jian Wang, Günter Radons
The Turing (wave) instability is only possible in reaction-diffusion systems with more than one (two) components. Motivated by the fact that a time delay increases the dimension of a system, we investigate the presence of diffusion-driven instabilities in single-species reaction-diffusion systems with delay. The stability of arbitrary one-component systems with a single discrete delay, with distributed delay, or with a variable delay is systematically analyzed. We show that a wave instability can appear from an equilibrium of single-species reaction-diffusion systems with fluctuating or distributed delay, which is not possible in similar systems with constant discrete delay or without delay...
November 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347517/embedding-the-dynamics-of-a-single-delay-system-into-a-feed-forward-ring
#9
Vladimir Klinshov, Dmitry Shchapin, Serhiy Yanchuk, Matthias Wolfrum, Otti D'Huys, Vladimir Nekorkin
We investigate the relation between the dynamics of a single oscillator with delayed self-feedback and a feed-forward ring of such oscillators, where each unit is coupled to its next neighbor in the same way as in the self-feedback case. We show that periodic solutions of the delayed oscillator give rise to families of rotating waves with different wave numbers in the corresponding ring. In particular, if for the single oscillator the periodic solution is resonant to the delay, it can be embedded into a ring with instantaneous couplings...
October 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347499/synchronized-rotation-in-swarms-of-magnetotactic-bacteria
#10
M Belovs, R Livanovičs, A Cēbers
Self-organizing behavior has been widely reported in both natural and artificial systems, typically distinguishing between temporal organization (synchronization) and spatial organization (swarming). Swarming has been experimentally observed in systems of magnetotactic bacteria under the action of external magnetic fields. Here we present a model of ensembles of magnetotactic bacteria in which hydrodynamic interactions lead to temporal synchronization in addition to the swarming. After a period of stabilization during which the bacteria form a quasiregular hexagonal lattice structure, the entire swarm begins to rotate in a direction opposite to the direction of the rotation of the magnetic field...
October 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347461/strongly-nonlinear-theory-of-rapid-solidification-near-absolute-stability
#11
Katarzyna N Kowal, Anthony L Altieri, Stephen H Davis
We investigate the nonlinear evolution of the morphological deformation of a solid-liquid interface of a binary melt under rapid solidification conditions near two absolute stability limits. The first of these involves the complete stabilization of the system to cellular instabilities as a result of large enough surface energy. We derive nonlinear evolution equations in several limits in this scenario and investigate the effect of interfacial disequilibrium on the nonlinear deformations that arise. In contrast to the morphological stability problem in equilibrium, in which only cellular instabilities appear and only one absolute stability boundary exists, in disequilibrium the system is prone to oscillatory instabilities and a second absolute stability boundary involving attachment kinetics arises...
October 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347187/mean-field-dynamics-of-a-population-of-stochastic-map-neurons
#12
Igor Franović, Oleg V Maslennikov, Iva Bačić, Vladimir I Nekorkin
We analyze the emergent regimes and the stimulus-response relationship of a population of noisy map neurons by means of a mean-field model, derived within the framework of cumulant approach complemented by the Gaussian closure hypothesis. It is demonstrated that the mean-field model can qualitatively account for stability and bifurcations of the exact system, capturing all the generic forms of collective behavior, including macroscopic excitability, subthreshold oscillations, periodic or chaotic spiking, and chaotic bursting dynamics...
July 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347014/imperfections-impacts-and-the-singularity-of-euler-s-disk
#13
Tamás Baranyai, Péter L Várkonyi
The motion of a rigid, spinning disk on a flat surface ends with a dissipation-induced finite-time singularity. The problem of finding the dominant energy absorption mechanism during the last phase of the motion generated a lively debate during the past two decades. Various candidates including air drag and different types of friction have been considered, nevertheless impacts have not been examined until now. We investigate the effect of impacts caused by geometric imperfections of the disk and of the underlying flat surface, through analyzing the dynamics of polygonal disks with unilateral point contacts...
September 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346874/internal-autoresonance-in-coupled-oscillators-with-slowly-decaying-frequency
#14
Agnessa Kovaleva, Leonid I Manevitch
In this work, we study resonance energy transfer from an impulsively loaded strongly nonlinear oscillator to a weakly coupled linear attachment with a slowly time-decaying stiffness. It is shown that even in the absence of external periodic forcing both oscillators may exhibit the resonance phenomenon, with the permanent response enhancement of the linear oscillator and the corresponding response reduction of the nonlinear actuator. This effect is said to be internal autoresonance. The influence of the system parameters on the emergence and stability of autoresonance is investigated both analytically and numerically...
September 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346233/video-recordings-to-analyze-preventable-management-errors-in-pediatric-resuscitation-bay
#15
Julia Borns, Jörg Ersch, Milana Dobrovoljac, Georg Staubli, Barbara Brotschi
OBJECTIVE: In treating patients of different ages and diseases in the pediatric resuscitation bay, management errors are common. This study aimed to analyze the adherence to advanced trauma life support and pediatric advanced life support guidelines and identify management errors in the pediatric resuscitation bay by using video recordings. METHODS: Video recording of all patients admitted to the pediatric resuscitation bay at University Children's Hospital Zurich during a 13-month period was performed...
January 16, 2018: Pediatric Emergency Care
https://www.readbyqxmd.com/read/29345639/emergent-constraint-on-equilibrium-climate-sensitivity-from-global-temperature-variability
#16
Peter M Cox, Chris Huntingford, Mark S Williamson
Equilibrium climate sensitivity (ECS) remains one of the most important unknowns in climate change science. ECS is defined as the global mean warming that would occur if the atmospheric carbon dioxide (CO2) concentration were instantly doubled and the climate were then brought to equilibrium with that new level of CO2. Despite its rather idealized definition, ECS has continuing relevance for international climate change agreements, which are often framed in terms of stabilization of global warming relative to the pre-industrial climate...
January 17, 2018: Nature
https://www.readbyqxmd.com/read/29344904/mgmt-assessment-in-pituitary-adenomas-comparison-of-different-immunohistochemistry-fixation-chemicals
#17
Alexander S G Micko, Romana Höftberger, Adelheid Wöhrer, Matthias Millesi, Engelbert Knosp, Stefan Wolfsberger
PURPOSE: Despite the established role of O6-methyl-guanine-DNA methyltransferase (MGMT) as a marker for temozolomide response, consensus of the most reliable method to assess MGMT expression in pituitary adenomas is still missing. Currently, immunohistochemistry (IHC) assessment of formaldehyde fixed tissue samples is most widely used in a semiquantitative description. As formaldehyde fails to completely preserve nucleic acids, RCL2, an alcohol-based formaldehyde-free fixative, has been proposed as a more reliable alternative in terms of cell stability...
January 17, 2018: Pituitary
https://www.readbyqxmd.com/read/29344721/post-mortem-mr-angiography-quantitative-investigation-and-intravascular-retention-of-perfusates-in-ex-situ-porcine-hearts
#18
Bridgette Webb, Thomas Widek, Sylvia Scheicher, Thorsten Schwark, Rudolf Stollberger
As the implementation of minimally invasive imaging techniques in both forensic and pathological practice increases, research in this area focuses on addressing recognised diagnostic weaknesses of current approaches. Assessment of sudden cardiac death (SCD) can be considered one such area in which post-mortem imaging still shows diagnostic weaknesses. We hypothesise that magnetic resonance imaging (MRI) with an angiographic adjunct may improve the visualisation and interpretation of cardiac pathologies in a post-mortem setting...
January 18, 2018: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/29343780/waste-windshield-derived-silicon-carbon-nanocomposites-as-high-performance-lithium-ion-battery-anodes
#19
Mingu Choi, Jae-Chan Kim, Dong-Wan Kim
Silicon has emerged as the most promising high-capacity material for lithium-ion batteries. Waste glass can be a potential low cost and environmentally benign silica resource enabling production of nanosized silicon at the industry level. Windshields are generally made of laminated glass comprising two separate glass bonded together with a layer of polyvinyl butyral sandwiched between them. Herein, silicon/carbon nanocomposites are fabricated from windshields for the first time via magnesiothermic reduction and facile carbonization process using both waste glass and polyvinyl butyral as silica and carbon sources, respectively...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343553/molecular-mechanisms-of-biased-and-probe-dependent-signaling-at-cxcr3-induced-by-negative-allosteric-modulators
#20
Regine Brox, Lampros Milanos, Noureldin Saleh, Paul Baumeister, Armin Buschauer, Dagmar Hofmann, Markus R Heinrich, Timothy Clark, Nuska Tschammer
Our recent explorations of allosteric modulators (AMs) with improved properties resulted in the identification of two biased negative AMs, N-1-{[3-(4-Ethoxyphenyl)-4-oxo-3,4-dihydropyrido[2,3-d]pyrimi-din2yl]ethyl}-4-(4-fluorobutoxy)-N-[(1-methylpiperidin-4-yl)me-thyl}]butanamide (BD103) and {5-[(N-{1-[3-(4-ethoxyphenyl)-4-oxo-3,4-dihydropyrido[2,3-d]pyrimidin-2-yl]ethyl-2-[4-fluoro-3-(trifluoromethyl)phenyl]acetamido)methyl]-2-fluorophenyl}boronic acid (BD064), that exhibited probe-dependent inhibition of the chemokine receptor CXCR3 signaling...
January 17, 2018: Molecular Pharmacology
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