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https://www.readbyqxmd.com/read/28814019/stiffness-control-of-a-nylon-twisted-coiled-actuator-for-use-in-mechatronic-rehabilitation-devices
#1
Brandon P R Edmonds, Ana Luisa Trejos
Mechatronic rehabilitation devices, especially wearables, have been researched extensively and proven to be promising additions to physical therapy, but most designs utilize traditional actuators providing unnatural, robot-like movements. Therefore, many researchers have focused on the development of actuators that mimic biological properties to provide patients with improved results, safety, and comfort. Recently, a twisted-coiled actuator (TCA) made from nylon thread has been found to possess many of these important properties when heated, such as variable stiffness, flexibility, and high power density...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813589/regulation-of-stability-on-histone-h2a-h2b-dimer-by-h2a-tyr57-phosphorylation
#2
Takuma Sueoka, Gosuke Hayashi, Akimitsu Okamoto
Histone H2A and H2B form a H2A-H2B heterodimer, which is a fundamental unit of nucleosome assembly and disassembly. Several posttranslational modifications change the interface between the H2A-H2B dimer and the H3-H4 tetramer, and regulate nucleosome stability. However, posttranslational modifications associated with the interface between H2A and H2B have not been discussed. In this paper, it is shown that Tyr57 phosphorylation in H2A strongly influences H2A-H2B dimerization. Tyr57-phosphorylated H2A was chemically synthesized and utilized to reconstitute the H2A-H2B dimer and nucleosome as well as canonical H2A...
August 16, 2017: Biochemistry
https://www.readbyqxmd.com/read/28813588/insight-to-the-thermal-decomposition-and-hydrogen-desorption-behaviors-of-nanh2-nabh4-hydrogen-storage-composite
#3
Ziwei Pei, Ying Bai, Yue Wang, Feng Wu, Chuan Wu
The light-weight compound material NaNH2-NaBH4 is regarded as a promising hydrogen storage composite due to the high hydrogen density. Mechanical ball-milling was employed to synthesize the composite NaNH2-NaBH4 (2/1 molar ratio), and the samples were investigated utilizing Thermogravimetric-differential thermal analysis-mass spectroscopy (TG-DTA-MS), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses. The full-spectrum test (range of the ratio of mass to charge: 0-200) shows that the released gaseous species contain H2, NH3, B2H6 and N2 in the heating process from room temperature to 400 °C, and possibly the impurity gas B6H12 also exists...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28813063/tuning-mass-transport-in-magnetic-nanoparticle-filled-viscoelastic-hydrogels-using-low-frequency-rotating-magnetic-fields
#4
Shahab Boroun, Faïçal Larachi
This study investigates the response of magnetic nanoparticles (MNPs), dispersed in a viscoelastic hydrogel, to an external rotating magnetic field (RMF) for the purpose of developing a new class of magneto-responsive materials with tunable mass transport properties. Ferrogels were prepared by chemical cross-linking and polymerization of acrylamide in colloidal dispersions of thermally blocked MNPs of cobalt ferrite. Magnetization measurements of ferrogels in a swollen state revealed a transitional state from ferromagnetism to superparamagnetism through the shrinkage of hysteresis loops and the reduction of remanent magnetization...
August 16, 2017: Soft Matter
https://www.readbyqxmd.com/read/28812895/correlating-free-volume-hole-distribution-to-the-glass-transition-temperature-of-epoxy-polymers
#5
Amin Aramoon, Timothy D Breitzman, Christopher F Woodward, Jaafar A El-Awady
A new algorithm is developed to quantify the free-volume hole distribution and its evolution in coarse-grained molecular dynamics simulations of polymeric networks. This is achieved by analyzing the geometry of the network rather than a voxelized image of the structure to accurately and efficiently find and quantify free-volume hole distributions within large scale simulations of polymer networks. The free-volume holes are quantified by fitting the largest ellipsoids and spheres in the free-volumes between polymer chains...
August 16, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28812868/light-and-strong-hierarchical-porous-sic-foam-for-efficient-electromagnetic-interference-shielding-and-thermal-insulation-at-elevated-temperatures
#6
Caiyun Liang, Zhenfeng Wang, Lina Wu, Xiaochen Zhang, Huan Wang, Zhijiang Wang
A novel light but strong SiC foam with hierarchical porous architecture are fabricated by using dough as raw material via carbonization and followed carbothermal reduction with silicon source. A significant synergistic effect is achieved by embedding meso and nano pores in micro-sized porous skeleton, which endows the SiC foam with high-performance electromagnetic interference shielding (EMI), thermal insulation and mechanical properties. The micro-sized skeleton withstands the high stress. The meso- and nano-sized pores enhance the multiple reflection of the incident electromagnetic waves and elongate the path of heat transfer...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812758/a-metalloporphyrin-based-porous-organic-polymer-as-an-efficient-catalyst-for-the-catalytic-oxidation-of-olefins-and-arylalkanes
#7
Zheng-Dong Ding, Wei Zhu, Tao Li, Rui Shen, Yunxing Li, Zaijun Li, Xuehong Ren, Zhi-Guo Gu
A metalloporphyrin-based porous organic polymer, Mn-PPOP-1, was constructed in high yield via the ketoenamine condensation of robust porphyrin tetraamines (TBPP) with 1,3,5-triformylphloroglucinol. The stable keto-enamine form in the synthesized polymer was unambiguously confirmed by (13)C CP-MAS solid state NMR. Noticeably, besides the high thermal and chemical stability, this material contains both micropores and mesopores, which are favorable for mass transfer in the catalytic application. Mn-PPOP-1 exhibits significantly high catalytic oxidation of olefins and arylalkanes at room temperature...
August 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28812653/adaptation-of-phytoplankton-to-a-decade-of-experimental-warming-linked-to-increased-photosynthesis
#8
C-Elisa Schaum, Samuel Barton, Elvire Bestion, Angus Buckling, Bernardo Garcia-Carreras, Paula Lopez, Chris Lowe, Samraat Pawar, Nicholas Smirnoff, Mark Trimmer, Gabriel Yvon-Durocher
Phytoplankton photosynthesis is a critical flux in the carbon cycle, accounting for approximately 40% of the carbon dioxide fixed globally on an annual basis and fuelling the productivity of aquatic food webs. However, rapid evolutionary responses of phytoplankton to warming remain largely unexplored, particularly outside the laboratory, where multiple selection pressures can modify adaptation to environmental change. Here, we use a decade-long experiment in outdoor mesocosms to investigate mechanisms of adaptation to warming (+4 °C above ambient temperature) in the green alga Chlamydomonas reinhardtii, in naturally assembled communities...
March 20, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812360/silicon-cations-intermixed-indium-zinc-oxide-interface-for-high-performance-thin-film-transistors-using-a-solution-process
#9
Jae Won Na, You Seung Rim, Hee Jun Kim, Jin Hyeok Lee, Seonghwan Hong, Hyun Jae Kim
Solution-processed amorphous metal-oxide thin-film transistors (TFTs) utilizing an intermixed interface between a metal-oxide semiconductor and a dielectric layer are proposed. In-depth physical characterizations are carried out to verify the existence of the intermixed interface which is inevitably formed by inter-diffusion of cations originated from a thermal process. In particular, when indium zinc oxide (IZO) semiconductor and silicon dioxide (SiO2) dielectric layer are in contact and thermally processed, a Si(4+) intermixed IZO (Si:IZO) interface is created...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812359/continuous-flow-electrophoresis-of-dna-and-proteins-in-a-two-dimensional-capillary-well-sieve
#10
Lian Duan, Zhen Cao, Levent Yobas
Continuous-flow electrophoresis of macromolecules is demonstrated using an integrated capillary-well sieve arranged into a two-dimensional anisotropic array on silicon. The periodic array features thousands of entropic barriers, each resulting from an abrupt interface between a 2-μm-deep well (channel) and a 70-nm capillary. These entropic barriers owing to two-dimensional confinement within the capillaries are vastly steep in relation to those arising from slits featuring one-dimensional confinement. Thus, the sieving mechanisms can sustain relatively large electric field strengths over a relatively small array area...
August 16, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28812354/3d-moldable-nanofiber-reinforced-transparent-composites-with-hierarchically-self-assembled-reverse-nacre-like-architecture
#11
Subir Kumar Biswas, Hironari Sano, Md Iftekhar Shams, Hiroyuki Yano
Achieving structural hierarchy and a uniform nanofiller dispersion simultaneously remains highly challenging for obtaining a robust polymer nanocomposite of immiscible components. In this study, a remarkably facile Pickering emulsification approach is developed to fabricate hierarchical composites of immiscible acrylic polymer and native cellulose nanofibers by taking advantage of the dual role of the nanofibers as both the emulsion stabilizer and polymer reinforcement. The composites feature a unique "reverse" nacre-like microstructure reinforced with well-dispersed two-tier hierarchical nanofiber network, leading to a synergistic high strength, modulus, and toughness (20, 50, and 53 times that of neat polymer, respectively), high optical transparency (89%), high flexibility and a drastically low thermal expansion (13 ppm/K, 1/15th of the neat polymer)...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812353/dopamine-incorporated-dual-bioactive-electroactive-shape-memory-polyurethane-elastomers-with-physiological-shape-recovery-temperature-high-stretchability-and-enhanced-c2c12-myogenic-differentiation
#12
Xin Zhao, Ruonan Dong, Baolin Guo, Peter X Ma
Soft tissue engineering needs elastic biomaterials not only mimicking the elasticity of soft tissue but also possessing multiple bioactivity to promote cell adhesion, proliferation and differentiation, which still remains ongoing challenges. Herein, we synthesized a series of dopamine-incorporated dual bioactive electroactive shape memory polyurethane elastomers by combining the properties of elastomeric poly(citric acid-co-polycaprolactone) (CA-PCL) polyurethane elastomer, bioactive dopamine (DA) and electroactive aniline hexamer (AH)...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812352/ca-%C3%AE-sialon-eu-phosphors-oxidation-states-energy-transfer-and-emission-enhancement-by-incorporation-aimed-surface-engineering
#13
Xiangyang Chen, Lin Gan, Zhi-Jun Zhang, Ping Lu, Xionghui Zeng, Linlin Zhang, Heliang Yao, FangFang Xu, Jing-Tai Zhao
Ca-α-SiAlON: Eu is one of the most promising phosphors exhibiting potential applications in high power LEDs owing to its excellent thermal stability and relative high luminescence efficiency comparable to YAG: Ce commercial phosphors. The oxidation states of Eu ions in Ca-α-SiAlON: Eu are still questionable and furthermore it yet exhibits lower luminescence intensity than commercial yellow phosphors. Therefore, in the present work, the valances of Eu ions in Ca-α-SiAlON have been examined which observed a mixture of divalence and trivalence...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812342/achieving-a-collapsible-strong-and-highly-thermally-conductive-film-based-on-oriented-functionalized-boron-nitride-nanosheets-and-cellulose-nanofiber
#14
Kai Wu, Jinchao Fang, Jinrui Ma, Rui Huang, Songgang Chai, Feng Chen, Qiang Fu
Boron nitride nanosheets (BNNS) film receives wide attention in both academia and industry due to its high thermal conductivity (TC) and good electrical insulation capability. However, the brittleness and low strength of BNNS film largely limit its application. Herein, functionalized BNNS (f-BNNS) with well-maintained in-plane crystalline structure was firstly prepared utilizing urea in the aqueous solution via ball-milling for the purpose of improving its stability in water and enhancing the interaction with polymer matrix...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812284/new-nanocomposites-of-polystyrene-with-polyaniline-doped-with-lauryl-sulfuric-acid
#15
A A Pud, O A Nikolayeva, L O Vretik, Yu V Noskov, N A Ogurtsov, O S Kruglyak, E A Fedorenko
This work is concentrated on synthesis and investigation of new core-shell nanocomposites of polystyrene (PS) with doped polyaniline (PANI). The latex containing PS nanoparticles with sizes of 15-30 nm was prepared by microemulsion polymerization of styrene in water media. The PS/PANI nanocomposites were synthesized by chemical oxidative polymerization of aniline in the PS latex media in a presence of lauryl sulfuric acid (LSA), which served as both dopant and plasticizer. The real content of PANI in the synthesized nanocomposites was determined by UV-Vis spectroscopy method...
August 15, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28812261/backbone-and-side-chain-1-h-15-n-and-13-c-resonance-assignments-of-two-sac10b-family-members-mvo10b-and-mth10btqqa-from-archaea
#16
Jinsong Xuan, Hongwei Yao, Yingang Feng, Jinfeng Wang
The Sac10b family proteins, also named as Alba, are small, basic, nucleic acid-binding proteins widely distributed in archaea. They possess divergent physiological functions such as binding to both DNA and RNA with a high affinity and involving in genomic DNA compaction, RNA transactions and transcriptional regulations. The structures of many Sac10b family proteins from hyperthermophilic archaea have been reported, while those from thermophilic and mesophilic archaea are largely unknown. As was pointed out, the homologous members from thermophilic and mesophilic archaea may have functions different from the hyperthermophilic members...
August 16, 2017: Biomolecular NMR Assignments
https://www.readbyqxmd.com/read/28812234/temperature-dependence-of-band-gap-in-mose2-grown-by-molecular-beam-epitaxy
#17
Byoung Ki Choi, Minu Kim, Kwang-Hwan Jung, Jwasoon Kim, Kyu-Sang Yu, Young Jun Chang
We report on a temperature-dependent band gap property of epitaxial MoSe2 ultrathin films. We prepare uniform MoSe2 films epitaxially grown on graphenized SiC substrates with controlled thicknesses by molecular beam epitaxy. Spectroscopic ellipsometry measurements upon heating sample in ultra-high vacuum showed temperature-dependent optical spectra between room temperature to 850 °C. We observed a gradual energy shift of optical band gap depending on the measurement temperature for different film thicknesses...
August 15, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28812233/synthesis-and-photophysical-study-of-new-green-fluorescent-tpa-based-poly-azomethine-s
#18
Naila Khalid, Asma Iqbal, Humaira Masood Siddiqi, O Ok Park
A series of poly(azomethine)s (PAMs) were synthesized from N(1)-(4-aminophenyl)-N(1)-(4-phenoxyphenyl)benzene-1,4-diamine (DA) and various dialdehydes to investigate the influence of structure of polymer chain and triphenylamine-based phenoxy pendant group on the optoelectronic properties. The structural characterization of the resulting poly(azomethine)s was carried out by solubility test, gel permeation chromatography, viscosity measurement, fourier transform infrared (FTIR) spectral and CHN elemental analysis...
August 15, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28812173/melatonin-attenuates-pain-hypersensitivity-and-decreases-astrocyte-mediated-spinal-neuroinflammation-in-a-rat-model-of-oxaliplatin-induced-pain
#19
Ye-Song Wang, Yuan-Yuan Li, Wei Cui, Li-Bin Li, Zhao-Cai Zhang, Bao-Ping Tian, Gen-Sheng Zhang
Neuroinflammatory response in spinal dorsal horn has been demonstrated to be a critical factor in oxaliplatin-induced pain. Melatonin has been shown to have anti-inflammatory and anti-allodynia effects in both preclinical and clinical studies. In the present study, we investigated the role of systemic administration of melatonin on oxaliplatin-induced pain. Intraperitoneal (i.p.) injection with oxaliplatin induced significantly mechanical allodynia and thermal hyperalgesia. Melatonin (i.p.) significantly alleviated mechanical allodynia and thermal hyperalgesia in the oxaliplatin but not sham-treated rats...
August 15, 2017: Inflammation
https://www.readbyqxmd.com/read/28812164/efficacy-of-fractional-lasers-in-treating-alopecia-a-literature-review
#20
Marina Perper, Adam S Aldahan, Rachel A Fayne, Christopher P Emerson, Keyvan Nouri
Hair loss stemming from different types of alopecia, such as androgenic alopecia and alopecia areata, negatively affects over half the population and, in many circumstances, causes serious psychosocial distress. Current treatment options for alopecia, such as minoxidil, anthralin, and intralesional corticosteroids, vary efficacy and side effect profiles. It is known that low-level laser/light therapies (LLLT), or photobiomodulations, such as the US FDA-cleared HairMax Lasercomb®, He-Ne laser, and excimer laser, are relatively affordable, user-friendly, safe, and effective forms of treatment for hair loss...
August 16, 2017: Lasers in Medical Science
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