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https://www.readbyqxmd.com/read/29159558/theoretical-investigation-of-the-safety-of-nitroguanidine-based-pbxs-containing-the-nonpolar-desensitizing-agent-polytetrafluoroethylene
#1
Zhong-Qing Xue, Jing He, Jun Zhang, Xi-Liang Zhang, Yin-Gang Chen, Fu-de Ren
In order to elucidate why the inclusion of a nonpolar desensitizing agent in polymer-bonded explosives (PBXs) affects their sensitivity and safety, the intermolecular interactions between nitroguanidine (NQ: a high-energy-density compound used as a propellant and in explosive charges) and F2C=CF2 were investigated theoretically at the B3LYP/6-311++G(2df,2p) and M06-2X/6-311++G(2df,2p) levels of theory, focusing especially on the influence of intermolecular interactions on the strength of the trigger bond in NQ...
November 20, 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/29157032/pain-fatigue-function-and-participation-among-long-term-manual-wheelchair-users-partnered-with-a-mobility-service-dog
#2
Claude Vincent, Dany H Gagnon, Frédéric Dumont
PURPOSE: To assess the effects of a mobility service dog (MSD) on pain, fatigue, wheelchair-related functional tasks, participation and satisfaction among manual wheelchair users over a nine-month period. METHOD: A longitudinal study with repeated assessment times before and three, six and nine months after intervention was achieved. Intervention consisted in partnering each participant with a MSD. The setting is a well-established provincial service dog training school and participants homes...
November 20, 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/29152907/hierarchical-multicomponent-inorganic-metamaterials-intrinsically-driven-self-assembly-at-the-nanoscale
#3
REVIEW
Igor Levchenko, Kateryna Bazaka, Michael Keidar, Shuyan Xu, Jinghua Fang
Increasingly intricate in their composition and structural organization, hierarchical multicomponent metamaterials with nonlinear spatially reconfigurable functionalities challenge the intrinsic constraints of natural materials, revealing tremendous potential for the advancement of biochemistry, nanophotonics, and medicine. Recent breakthroughs in high-resolution nanofabrication utilizing ultranarrow, precisely controlled ion or laser beams have enabled assembly of architectures of unprecedented structural and functional complexity, yet costly, time- and energy-consuming high-resolution sequential techniques do not operate effectively at industry-required scale...
November 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29152630/noise-and-diffusion-of-a-vibrated-self-propelled-granular-particle
#4
Lee Walsh, Caleb G Wagner, Sarah Schlossberg, Christopher Olson, Aparna Baskaran, Narayanan Menon
Granular materials are an important physical realization of active matter. In vibration-fluidized granular matter, both diffusion and self-propulsion derive from the same collisional forcing, unlike many other active systems where there is a clean separation between the origin of single-particle mobility and the coupling to noise. Here we present experimental studies of single-particle motion in a vibrated granular monolayer, along with theoretical analysis that compares grain motion at short and long time scales to the assumptions and predictions, respectively, of the active Brownian particle (ABP) model...
November 20, 2017: Soft Matter
https://www.readbyqxmd.com/read/29151203/experimental-aspects-of-polarization-optimized-experiments-poe-for-magic-angle-spinning-solid-state-nmr-of-microcrystalline-and-membrane-bound-proteins
#5
T Gopinath, Gianluigi Veglia
Conventional NMR pulse sequences record one spectrum per experiment, while spending most of the time waiting for the spin system to return to the equilibrium. As a result, a full set of multidimensional NMR experiments for biological macromolecules may take up to several months to complete. Here, we present a practical guide for setting up a new class of MAS solid-state NMR experiments (POE or polarization optimized experiments) that enable the simultaneous acquisition of multiple spectra of proteins, accelerating data acquisition...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29150488/membrane-binding-of-and-a-self-inhibitory-interaction-within-nup155-are-required-for-nuclear-pore-complex-formation
#6
Paola De Magistris, Marianna Tatarek-Nossol, Manfred Dewor, Wolfram Antonin
Nuclear pore complexes (NPCs) are the gateways through the nuclear envelope. How they form into a structure containing three rings and integrate into the nuclear envelope remains a challenging paradigm for coordinated assembly of macro-complexes. In vertebrates, the cytoplasmic and nucleoplasmic rings of NPCs are mostly formed by multiple copies of the Nup107-Nup160 complex, whereas the central, or inner ring is composed of Nup53, Nup93, Nup155 and the two paralogues Nup188 and Nup205. Inner ring assembly is only partially understood...
November 17, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/29149229/van-t-hoff-s-law-for-active-suspensions-the-role-of-the-solvent-chemical-potential
#7
Jeroen Rodenburg, Marjolein Dijkstra, René van Roij
We extend Van't Hoff's law for the osmotic pressure to a suspension of active Brownian particles. The propelled particles exert a net reaction force on the solvent, and thereby either drive a measurable solvent flow from the connecting solvent reservoir through the semipermeable membrane, or increase the osmotic pressure and cause the suspension to rise to heights as large as micrometers for experimentally realized microswimmers described in the literature. The increase in osmotic pressure is caused by the background solvent being, in contrast to passive suspensions, no longer at the chemical potential of the solvent reservoir...
November 17, 2017: Soft Matter
https://www.readbyqxmd.com/read/29148977/the-role-of-micrornas-in-chronic-respiratory-disease-recent-insights
#8
Lindsay R Stolzenburg, Ann Harris
Chronic respiratory diseases encompass a group of diverse conditions affecting the airways, which all impair lung function over time. They include cystic fibrosis, idiopathic pulmonary fibrosis, chronic obstructive pulmonary disease, and asthma, which together affect hundreds of millions of people worldwide. MicroRNAs (miRNAs), a class of small non-coding RNAs involved in post-transcriptional gene repression, are now recognized as major regulators in the development and progression of chronic lung disease. Alterations in miRNA abundance occur in lung tissue, inflammatory cells, and freely circulating in blood and are thought to function both as drivers and modifiers of disease...
November 27, 2017: Biological Chemistry
https://www.readbyqxmd.com/read/29148823/space-dust-collisions-as-a-planetary-escape-mechanism
#9
Arjun Berera
It is observed that hypervelocity space dust, which is continuously bombarding Earth, creates immense momentum flows in the atmosphere. Some of this fast space dust inevitably will interact with the atmospheric system, transferring energy and moving particles around, with various possible consequences. This paper examines, with supporting estimates, the possibility that by way of collisions the Earth-grazing component of space dust can facilitate planetary escape of atmospheric particles, whether they are atoms and molecules that form the atmosphere or larger-sized particles...
November 17, 2017: Astrobiology
https://www.readbyqxmd.com/read/29148558/ultrasound-propelled-nanowire-motors-enhance-asparaginase-enzymatic-activity-against-cancer-cells
#10
Murat Uygun, Beatriz Jurado-Sánchez, Deniz Aktas Uygun, Virendra Vikram Singh, Liangfang Zhang, Joseph Wang
Ultrasound-(US) propelled nanowires consisting of Au/Ni/Au/PEDOT-PPy-COOH segments are modified with asparaginase enzyme and applied as an effective anti-cancer agent. After immobilization of asparaginase onto the surface of the nanowire motors, the enzyme displays enhanced thermal and pH stabilities, improved resistance towards protease, and higher affinity for the substrate. The fast motion of the motor-carrying asparaginase leads to greatly accelerated biocatalytic depletion of asparagine and hence to a significantly enhanced inhibition efficacy against El4 lymphoma cancer cells (92%) as compared to free enzyme counterpart (17%) and other control groups...
November 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/29147015/structure-of-flgk-reveals-the-divergence-of-the-bacterial-hook-filament-junction-of-campylobacter
#11
Paula V Bulieris, Nausad H Shaikh, Peter L Freddolino, Fadel A Samatey
Evolution of a nano-machine consisting of multiple parts, each with a specific function, is a complex process. A change in one part should eventually result in changes in other parts, if the overall function is to be conserved. In bacterial flagella, the filament and the hook have distinct functions and their respective proteins, FliC and FlgE, have different three-dimensional structures. The filament functions as a helical propeller and the hook as a flexible universal joint. Two proteins, FlgK and FlgL, assure a smooth connectivity between the hook and the filament...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29144765/triazoliptycenes-a-twist-on-iptycene-chemistry-for-regioselective-cross-coupling-to-build-nonstacking-fluorophores
#12
Taewon Kang, Hongsik Kim, Dongwhan Lee
Triazoliptycene fluorophores have been designed and synthesized, in which a three-dimensional propeller-like iptycene motif is employed to suppress intermolecular π-π stacking in the solid state. Key to the success of this modular synthesis is a stereoelectronic bias imposed by the iptycene scaffold, which assists the desired regioselectivity in the C-N cross-coupling step as the last-stage structure diversification from a common precursor.
November 16, 2017: Organic Letters
https://www.readbyqxmd.com/read/29144529/driving-dynamic-colloidal-assembly-using-eccentric-self-propelled-colloids
#13
Zhan Ma, Qun-Li Lei, Ran Ni
Designing protocols to dynamically direct the self-assembly of colloidal particles has become an important direction in soft matter physics because of promising applications in the fabrication of dynamic responsive functional materials. Here, using computer simulations, we found that in the mixture of passive colloids and eccentric self-propelled active particles, when the eccentricity and self-propulsion of active particles are high enough, the eccentric active particles can push passive colloids to form a large dense dynamic cluster, and the system undergoes a novel dynamic demixing transition...
November 16, 2017: Soft Matter
https://www.readbyqxmd.com/read/29143043/multi-functional-micromotor-microfluidic-fabrication-and-water-treatment-application
#14
Anqi Chen, Xue-Hui Ge, Jian Chen, Liyuan Zhang, Jian-Hong Xu
Micromotors are important for a wide variety of applications. Here, we develop a microfluidic approach for one-step fabrication of a Janus self-propelled micromotor with multiple functions. By fine tuning the fabrication parameters and loading functional nanoparticles, our micromotor reaches a high speed and achieves an oriented function to promote the water purification efficiency and recycling process.
November 16, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/29142272/individuals-of-the-common-namib-day-gecko-vary-in-how-adaptive-simplification-alters-sprint-biomechanics
#15
Clint E Collins, Timothy E Higham
Locomotion inextricably links biomechanics to ecology as animals maneuver through mechanically challenging environments. Faster individuals are more likely to escape predators, surviving to produce more offspring. Fast sprint speed evolved several times in lizards, including geckos. However, the underlying mechanisms determining performance await discovery in many clades. Novel morphological structures influence these mechanisms by adding complexity to the government of locomotion. Gecko adhesion coevolves with modified muscles, tendons, and reflexes...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29141087/effect-of-granulocyte-macrophage-colony-stimulating-factor-with-or-without-supervised-exercise-on-walking-performance-in-patients-with-peripheral-artery-disease-the-propel-randomized-clinical-trial
#16
Mary M McDermott, Luigi Ferrucci, Lu Tian, Jack M Guralnik, Donald Lloyd-Jones, Melina R Kibbe, Tamar S Polonsky, Kathryn Domanchuk, James H Stein, Lihui Zhao, Doris Taylor, Christopher Skelly, William Pearce, Harris Perlman, Walter McCarthy, Lingyu Li, Ying Gao, Robert Sufit, Christina L Bloomfield, Michael H Criqui
Importance: Benefits of granulocyte-macrophage colony-stimulating factor (GM-CSF) for improving walking ability in people with lower extremity peripheral artery disease (PAD) are unclear. Walking exercise may augment the effects of GM-CSF in PAD, since exercise-induced ischemia enhances progenitor cell release and may promote progenitor cell homing to ischemic calf muscle. Objectives: To determine whether GM-CSF combined with supervised treadmill exercise improves 6-minute walk distance, compared with exercise alone and compared with GM-CSF alone; to determine whether GM-CSF alone improves 6-minute walk more than placebo and whether exercise improves 6-minute walk more than an attention control intervention...
November 15, 2017: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/29140661/an-international-model-for-antibiotics-regulation
#17
Emilie Aguirre
We face a global antibiotics resistance crisis. Antibiotic drugs are rapidly losing their effectiveness, potentially propelling us toward a post-antibiotic world. The largest use of antibiotics in the world is in food-producing animals. Food producers administer these drugs in routine, low doses—the types of doses that are incidentally the most conducive to breeding antibiotic resistance. In general, individual countries have been too slow to act in regulating misuse and overuse of antibiotics in foodproducing animals...
2017: Food and Drug Law Journal
https://www.readbyqxmd.com/read/29140639/determining-the-effectiveness-of-mirrors-and-camera-systems-in-monitoring-the-rearward-visibility-of-self-propelled-agricultural-machinery
#18
Shawn G Ehlers, William E Field
This study concerned the ability of operators of tractors and other self-propelled agricultural machinery to visually recognize objects and/or hazards within close proximity to the rear of those machines and/or any implements in tow, especially when backing up. It was hypothesized that the data collected would identify the factors affecting rearward visibility and help determine the effectiveness of two backup-assisting devices (i.e., mirrors and camera systems) in enhancing the operator's ability to observe objects or hazards...
July 31, 2017: Journal of Agricultural Safety and Health
https://www.readbyqxmd.com/read/29140617/methods-of-collecting-and-analyzing-rearward-visibility-data-for-agricultural-machinery-hazard-and-or-object-detectability
#19
Shawn G Ehlers, William E Field, Daniel R Ess
Recent interest in rearward visibility for private, construction, and commercial vehicles and documentation of rearward runovers involving bystanders outside the field of vision of the vehicle operator led to an investigation into the need for enhanced methods of rearward visibility for large, off-highway, agricultural equipment. A review of the literature found limited relevant research and minimal data on incidents involving rearward runovers of bystanders and co-workers. This article reviews the findings regarding the methods identified and tested to collect and analyze rearward visibility data, from the operator's perspective, for large self-propelled agricultural equipment, including the four-wheel drive tractors, combines, agricultural sprayers, and skid-steer loaders that are increasingly found on agricultural production sites...
January 26, 2017: Journal of Agricultural Safety and Health
https://www.readbyqxmd.com/read/29138312/correlating-cell-shape-and-cellular-stress-in-motile-confluent-tissues
#20
Xingbo Yang, Dapeng Bi, Michael Czajkowski, Matthias Merkel, M Lisa Manning, M Cristina Marchetti
Collective cell migration is a highly regulated process involved in wound healing, cancer metastasis, and morphogenesis. Mechanical interactions among cells provide an important regulatory mechanism to coordinate such collective motion. Using a self-propelled Voronoi (SPV) model that links cell mechanics to cell shape and cell motility, we formulate a generalized mechanical inference method to obtain the spatiotemporal distribution of cellular stresses from measured traction forces in motile tissues and show that such traction-based stresses match those calculated from instantaneous cell shapes...
November 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
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