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Pengfei Yang, Zhepeng Zhang, Mengxing Sun, Feng Lin, Ting Cheng, Jianping Shi, Chunyu Xie, Yuping Shi, Shaolong Jiang, Yahuan Huan, Porun Liu, Feng Ding, Chunyang Xiong, Dan Xie, Yanfeng Zhang
Atomically thin transition metal dichalcogenides (TMDCs) have received substantial interests due to their unique thickness-dependent optical and electronic properties, and related applications in optoelectronics. However, the large-scale, thickness tunable growth of such materials are still challenging. Herein, we report a fast growth of thickness tunable wedding-cake like MoS2 flakes on 6-inch soda-lime glass, by using NaCl-coated Mo foils as metal-precursors. The MoS2 thicknesses are tuned from one layer (1L) to ˃20L by controlling the concentrations of NaCl promoter...
February 20, 2019: ACS Nano
Jenine McCutcheon, Ian M Power, Jeremiah Shuster, Anna Lee Harrison, Gregory Dipple, Gordon Southam
The stability and longevity of carbonate minerals make them an ideal sink for surplus atmospheric carbon dioxide. Biogenic magnesium carbonate mineral precipitation from the magnesium-rich tailings generated by many mining operations could offset net mining greenhouse gas emissions, while simultaneously giving value to mine waste products. In this investigation, cyanobacteria in a wetland bioreactor enabled the precipitation of magnesite (MgCO3), hydromagnesite [Mg5(CO3)4(OH)2·4H2O], and dypingite [Mg5(CO3)4(OH)2·5H2O] from a synthetic wastewater comparable in chemistry to what is produced by acid leaching of ultramafic mine tailings...
February 20, 2019: Environmental Science & Technology
Mahdiyeh-Sadat Hosseini, Majid Masteri-Farahani
New magnetically recoverable solid acid catalysts for acid-catalyzed reactions were designed via the surface chemical functionalization of silica-coated magnetite nanoparticles (SCMNPs) with sulfonic acid groups. First, the SCMNPs were covalently functionalized with 3-aminopropyl groups to achieve Amp-SCMNPs. Then, reaction of the Amp-SCMNPs with 1,4-butane sultone followed by acidification with phosphotungstic acid (HPW) or diluted sulfuric acid produced magnetically recoverable solid acid catalysts, HPW-ampsul-SCMNPs and H-ampsul-SCMNPs, respectively...
February 20, 2019: Chemistry, An Asian Journal
R López-Píriz, B Cabal, L Goyos-Ball, A Fernández, J F Bartolomé, J S Moya, R Torrecillas
The idea of permanent tooth replacement goes back to the year 2000 BC at least, when carved bamboo pegs were used to replace missing teeth in ancient China. The phenomenon of osseointegration, however, was not verified until the mid-1960's, when Pr. Branemark discovered that titanium could integrate to bone. Since then, the osseointegration capacity of implants has been profoundly investigated and implants as such have evolved enormously in all possible aspects, from material selection and processing to specific surface engineering, amongst many others...
February 20, 2019: Journal of Biomedical Materials Research. Part A
Sana Asif, Kenta Asawa, Yuuki Inoue, Kazuhiko Ishihara, Björn Lindell, Robin Holmgren, Bo Nilsson, Anneli Rydén, Marianne Jensen-Waern, Yuji Teramura, Kristina N Ekdahl
Artificial surfaces that come into contact with blood induce an immediate activation of the cascade systems of the blood, leading to a thrombotic and/or inflammatory response that can eventually cause damage to the biomaterial or the patient, or to both. Heparin coating has been used to improve hemocompatibility, and another approach is 2-methacryloyloxyethyl phosphorylcholine (MPC)-based polymer coatings. Here, the aim is to evaluate the hemocompatibility of MPC polymer coating by studying the interactions with coagulation and complement systems using human blood in vitro model and pig in vivo model...
February 20, 2019: Macromolecular Bioscience
Wei Jing, Yiqian Huang, Pengfei Wei, Qing Cai, Xiaoping Yang, Weihong Zhong
The strategy of using conductive materials in regenerating bone defects is attractive benefiting from the bioelectricity feature of natural bone tissues. Thereby, POP conductive fibers were fabricated by coating polypyrrole (PPY) onto electrospun poly(L-lactide) (PLLA) fibers, and their potentials in promoting osteogenic differentiation of bone mesenchymal stromal cells (BMSCs) were investigated. Different from the smooth-surfaced PLLA fibers, POP fibers were rough-surfaced and favorable for protein adsorption and mineralization nucleation...
February 20, 2019: Journal of Biomedical Materials Research. Part A
Jianming Wu, Hemant K Mishra, Bruce Walcheck
Human NK cell antitumor activities involve Ab-dependent cell-mediated cytotoxicity (ADCC), which is a key mechanism of action for several clinically successful tumor-targeting therapeutic mAbs. Human NK cells exclusively recognize these Abs by the Fcγ receptor CD16A (FcγRIIIA), one of their most potent activating receptors. Unlike other activating receptors on NK cells, CD16A undergoes a rapid down-regulation in expression by a proteolytic process following NK cell activation with various stimuli. In this review, the role of a disintegrin and metalloproteinase-17 (ADAM17) in CD16A cleavage and as a regulatory checkpoint is discussed...
February 20, 2019: Journal of Leukocyte Biology
Tim Caro, Yvette Argueta, Emmanuelle Sophie Briolat, Joren Bruggink, Maurice Kasprowsky, Jai Lake, Matthew J Mitchell, Sarah Richardson, Martin How
Averting attack by biting flies is increasingly regarded as the evolutionary driver of zebra stripes, although the precise mechanism by which stripes ameliorate attack by ectoparasites is unknown. We examined the behaviour of tabanids (horse flies) in the vicinity of captive plains zebras and uniformly coloured domestic horses living on a horse farm in Britain. Observations showed that fewer tabanids landed on zebras than on horses per unit time, although rates of tabanid circling around or briefly touching zebra and horse pelage did not differ...
2019: PloS One
Eilam Z B Smolinsky, Avner Neubauer, Anup Kumar, Shira Yochelis, Eyal Capua, Raanan Carmieli, Yossi Paltiel, Ron Naaman, Karen Michaeli
We study GaAs/AlGaAs devices hosting a two-dimensional electron gas and coated with a monolayer of chiral organic molecules. We observe clear signatures of room temperature magnetism, which is induced in these systems by applying a gate voltage. We explain this phenomenon as a consequence of the spin-polarized charges that are injected into the semiconductor through the chiral molecules. The orientation of the magnetic moment can be manipulated by low gate voltages, with a switching rate in the MHz range. Thus, our devices implement an efficient, electric field controlled magnetization, which has long been desired for their technical prospects...
February 20, 2019: Journal of Physical Chemistry Letters
Peipei Wang, Jan J Cilliers, Stephen Johan Neethling, Pablo R Brito-Parada
The rising behavior of bubbles, initially half and fully coated with glass beads of various sizes, was investigated. The bubble velocity, aspect ratio and oscillation periods were determined using high-speed photography and image analysis. In addition, the acting forces, drag modification factor and modified drag coefficient were calculated and interpreted. Results show that the aspect ratio oscillation of the rising bubbles is similar, irrespective of the attached particle size. As the particle size is increased, the rising bubbles have a lower velocity and aspect ratio amplitude, with the time from release to each aspect ratio peak increasing...
February 20, 2019: Langmuir: the ACS Journal of Surfaces and Colloids
Jiatu Li, Taisei Kaku, Yuki Tokura, Ko Matsukawa, Kenta Homma, Taihei Nishimoto, Yuki Hiruta, Aya Mizutani Akimoto, Kenichi Nagase, Hideko Kanazawa, Seimei Shiratori
The cell manipulation technique using thermoresponsive polymers is currently attracting much attention for applications in the medical field. To achieve arbitrary and accurate cells control, it is necessary to intensely research fibronectin behavior. A smart surface, which has thermoresponsive wettability and which can adsorb or desorb fibronectin repeatedly without the presence of cells, was fabricated by electrospinning method. The fabricated coating changed its structure as the temperature was changed, and this transformation could substitute for the pulling force generated by the cytoskeletal contraction of cells...
February 20, 2019: Biomacromolecules
Tung Pham, Guanghui Li, Elena Bekyarova, Mikhail E Itkis, Ashok Mulchandani
Red light illumination with photon energy matching the direct bandgap of CVD grown single-layer MoS2 with Au metal electrodes was used to induce a photocurrent which was employed instead of dark current for NO2 gas sensing. Resulted Au/MoS2 /Au optoelectronic gas sensor showed a significant enhancement of the device sensitivity S toward ppb level of NO2 gas exposure reaching S=4.8%/ppb (4800%/ppm), where S is a slope of dependence of relative change of the sensor resistance on NO2 concentration. Further optimization of the MoS2 based optoelectronic gas sensor by using a graphene (Gr) with lower work function than of Au for the electrical contacts to the MoS2 channel allowed an increase of photocurrent...
February 20, 2019: ACS Nano
Licheng Li, Haiqin Yue, Suoying Zhang, Yao-Bing Huang, Weina Zhang, Peng Wu, Yongxin Ji, Fengwei Huo
In the past decades, water tolerance has always been the long-pending key issue of sulfated solid superacid (abbr. SO42-/MxOy) towards industrial applications. Herein, we report a strategy of facile coating a thick-tunable hydrophobic layer over the SO42-/MxOy, which can significantly improve the water tolerance with negligible inhibition on the catalytic performance of SO42-/MxOy. Even after being directly immersed in the water, the hydrophobic SO42-/MxOy can still maintain above 90% of original catalytic activity whereas pristine SO42-/MxOy and control samples are almost completely deactivated...
February 20, 2019: ACS Applied Materials & Interfaces
Bei Qian, Zhaoliang Zheng, Marios Michailidis, Nicole Fleck, Matthew Bilton, Yan Song, Guoliang Li, Dmitry G Shchukin
Mussel-inspired properties of dopamine have attracted immense scientific interest for surface modification of nanoparticles due to the high potential of dopamine functional groups to increase adhesion of nanoparticles to flat surfaces. Here, we report for the first time a novel type of inhibitor-loaded nanocontainers using polydopamine (PDA) as a pH-sensitive gatekeeper for mesoporous silica nanoparticles (MSNs). The encapsulated inhibitor (benzotriazole) was loaded into MSNs at neutral pH, demonstrating fast release in acidic environment...
February 20, 2019: ACS Applied Materials & Interfaces
Min Ji, Ningning Ma, Ye Tian
With the development of structural DNA nanotechnology, DNA has now far exceeded its original function: as a genetic code. It can, in principle, self-assemble into desired shapes with accurate size. Moreover, it can perform as a functional linker to program other materials by grafting DNA onto these materials. Nanoparticles, both inorganic and organic, can now be programmatically assembled into complex 3D superlattices with high order when guided by DNA. By encoding functions into the as-assembled nanoparticles, materials with excellent collective effects may be invented...
February 20, 2019: Small
Lisandra Serra Damasceno, Tania Vite-Garín, José Antonio Ramírez, Gabriela Rodríguez-Arellanes, Marcos Abreu de Almeida, Mauro de Medeiros Muniz, Jacó Ricarte Lima de Mesquita, Terezinha do Menino Jesus Silva Leitão, Maria Lucia Taylor, Rosely Maria Zancopé-Oliveira
Mixed infection by Histoplasma capsulatum isolates with different mating types, in AIDS-patients are described in this study. Morphological, mating type-specific PCR assay and multilocus sequencing type analysis of H. capsulatum isolates recovered from two Brazilian AIDS-patients were performed. Five H. capsulatum isolates were recovered at different times from the two patients. Three isolates were obtained from bone marrow (day 1 - CE0411) and buffy coat cultures (day 1 - CE0311; day 2 - CE0511) of patient 1, and two isolates were isolated from buffy coat cultures (day 3 - CE2813; day 12 - CE2513) of patient 2...
February 14, 2019: Revista do Instituto de Medicina Tropical de São Paulo
Daniel Araujo Kramer de Mesquita, Erika Feitosa Queiroz, Maria Allyce de Oliveira, Carlos Magno Queiroz da Cunha, Fernanda Martins Maia, Rafaela Vieira Correa
BACKGROUND: Paracentesis is a routine medical procedure quite relevant in clinical practice. There are risks of complications related to paracentesis, so it is essential a proper trainee for the younger practicer. OBJECTIVE: The article describes the construction and the application of a low cost paracentesis simulator for undergraduate medical students and it also describes the perception of students about the simulator as well. METHODS: A low-cost model was developed by the Program of Tutorial Education for training medical students during three editions of an undergraduate theoretical-practical course of bedside invasive procedures...
October 2018: Arquivos de Gastroenterologia
Valeria Castelletto, Charlotte J C Edwards-Gayle, Ian W Hamley, Glyn Barrett, Jani Seitsonen, Janne Ruokolainen
The preparation of hydrogels and stable emulsions is important in the formulation of many functional nanostructured soft materials. We investigate the multi-functional self-assembly and bioactivity properties of a novel surfactant-like peptide that shows antimicrobial activity, that is able to form hydrogels without pH adjustment, and is able to stabilize oil-in-water emulsions. Furthermore, we demonstrate on-demand de-emulsification in response to the protease enzyme elastase. We show that the surfactant-like peptide (Ala)9-Arg (A9R) forms β-sheet fibers above a critical aggregation concentration and that water-in-oil emulsions are stabilized by a coating of β-sheet fibers around the emulsion droplets...
February 20, 2019: ACS Applied Materials & Interfaces
Kiduk Han, Tae Yoon Park, Kijung Yong, Hyung Joon Cha
The surface wetting occurring in daily life causes undesired contaminations, which are critical issues in various fields. To solve these problems, the nonwetting property of a superhydrophobic (SH) surface has proven its utility by preventing contaminant infiltration, serious infections, or malfunction. However, applying SH surfaces in the biomedical field has been limited due to the weak durability and toxicity of the related components. To overcome these limitations, we developed a robust and biocompatible SH surface through combinational biomimicking of three natural organisms: lotus leaf, mussel, and sandcastle worm, for the first time...
February 20, 2019: ACS Applied Materials & Interfaces
Yi Xing, Qi Pan, Xin Du, Tailin Xu, Yan He, Xueji Zhang
Asymmetric dual-function of Janus micro/nanoparticles that have different surface modifications, structures or material properties, are extremely promising as building blocks in constructing micro-/nanomotors. However, current synthesis strategies are usually lack of controlling the coverages of Janus micro/nanoparticles, which hinders in-depth researches of their effects on the performance of Janus nanomotors. This study demonstrates a versatile approach for fabrication of Janus dendritic porous silica nanomotors with precisely modulated coverages from 0 to 100% by controlling the embedded depth of aminopropyl-modified dendritic porous silica nanoparticles (DPSNs-NH2) with positive charges and subsequently adsorbing the oppositely charged Pt nanoparticles...
February 20, 2019: ACS Applied Materials & Interfaces
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