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Ulrika Smedh, Karen A Scott, Timothy H Moran
Besides its well-known action to stimulate thyroid hormone release, Thyrotropin mRNA is expressed within the brain and Thyrotropin and its receptor have been shown to be present in brain areas that control feeding and gastrointestinal function. Here, the hypothesis that Thyrotropin acts on receptors in the dorsal hindbrain to alter food intake and/or gastric function was tested. Fourth ventricular injections of Thyrotropin (0.06, 0.6 and 6.0 µg) were given to rats with chronic intracerebroventricular cannulas aimed at the fourth ventricle...
January 3, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
Hongwei Cheng, Xiaoshan Fan, Xiaoyuan Wang, Enyi Ye, Xian Jun Loh, Zibiao Li, Yun-Long Wu
In this report, a new star-like copolymer -CD-g-(PNIPAAm-b-POEGA)x consisting of a -CD core, grafted with temperature-responsive poly(N-isopropylacrylamide) (PNIPAAm) and biocompatible poly(oligo(ethylene glycol) acrylate) (POEGA) in a block copolymer of the arms, was used to deliver chemotherapeutics to drug resistant cancer tumours. The first step of the self-assembly process involves the encapsulation of chemotherapeutics through host-guest inclusion complexation between the -cyclodextrin cavity and the anti-cancer drug...
January 19, 2018: Biomacromolecules
Nikolay V Kireev, Oleg A Filippov, Alexander A Pavlov, Lina M Epstein, Victor D Makhaev, Victor P Dyadchenko, Elena S Shubina, Natalia V Belkova
The interaction of trans-W(N2)2(dppe)2 (1; dppe = 1,2-bis(diphenylphosphino)ethane) with relatively weak acids (p-nitrophenol, fluorinated alcohols, CF3COOH) was studied by means of variable temperature IR and NMR spectroscopy and complemented by DFT/B3PW91-D3 calculations. The results show, for the first time, the formation of a hydrogen bond to the coordinated dinitrogen, W-N≡N···H-O, that is preferred over H-bonding to the metal atom, W···H-O, despite the higher proton affinity of the latter. Protonation of the core metal-the undesirable side step in the conversion of N2 to NH3-can be avoided by using weaker and, more importantly, bulkier acids...
January 19, 2018: Inorganic Chemistry
S P Sreenilayam, D Rodriguez-Lojo, V P Panov, V Swaminathan, J K Vij, Yu P Panarin, E Gorecka, A Panov, P J Stevenson
Calamitic liquid crystals based on 5-phenyl-pyrimidine derivatives have been designed, synthesized, and characterized. The 5-phenyl pyrimidine core was functionalized with a chiral (R,R)-2,3-epoxyhexoxy chain on one side and either siloxane or perfluoro terminated chains on the opposite side. The one involving a perfluorinated chain shows SmA^{*} phase over a wide temperature range of 82 °C, whereas the siloxane analog exhibits both SmA^{*} and SmC^{*} phases over a broad range of temperatures, and a weak first-order SmA^{*}-SmC^{*} transition is observed...
October 2017: Physical Review. E
Rui Zhang, Kenneth S Schweizer
The Elastically Collective Nonlinear Langevin Equation theory for one-component viscous liquids and suspensions is generalized to treat coupled slow activated relaxation and diffusion in glass-forming binary sphere mixtures of any composition, size ratio and inter-particle interactions. A trajectory-level dynamical coupling parameter concept is introduced to construct two coupled dynamic free energy functions for the smaller penetrant and larger matrix particle. A two-step dynamical picture is proposed where the first step process involves matrix-facilitated penetrant hopping quantified in a self-consistent manner based on a temporal coincidence condition...
January 18, 2018: Journal of Physical Chemistry. B
Haihu Yu, Ying Wang, Jian Ma, Zhou Zheng, Zhuozhao Luo, Yu Zheng
A Fabry-Perot interferometric sensor for temperature measurement was fabricated based on a silica glass solid-core photonic crystal fiber with a central air-bore. By splicing a stub of photonic crystal fiber to a standard single-mode fiber, an intrinsic Fabry-Perot cavity was formed inside the photonic crystal fiber. Sensing experiment results show that the sensor can work stably for a consecutive 24 h under temperatures up to 1100 °C, and the short-term operation temperature can reach as high as 1200 °C (<30 min)...
January 18, 2018: Sensors
Jia-Wei Liu, Lei Feng, Haifeng Su, Zhi Wang, Quan-Qin Zhao, Xingpo Wang, Chen-Ho Tung, Di Sun, Lan-Sun Zheng
Although there has been an upsurge of interest in anisotropic assembly of inorganic nanoparticles, atomically precise self-assembly of anisotropic (nonspherical) high-nuclearity metal clusters is extremely rare. Herein, we presented two novel silver nanoclusters, Ag52 (SD/Ag23) and Ag76 (SD/Ag24), which are interiorly templated by five MoO42- and a pair of Mo6O228- anions, respectively, and co-protected by bridging RSH and terminal diphosphine ligands exteriorly. Regiospe-cific distribution diphosphine ligands on the surface and the arrangement of multiple molybdate templates within the nanoclusters synergetically tailor their shapes to anisotropic oblate spheroid and elongated rod, respectively, as opposed to isotropic nanospheres...
January 18, 2018: Journal of the American Chemical Society
Jinwan Kim, Uiho Choi, Jaedo Pyeon, Byeongchan So, Okhyun Nam
We report deep ultraviolet (UVC) emitting core-shell-type AlGaN/AlN multiple quantum wells (MQWs) on the AlN nanorods which are prepared by catalyst/lithography free process. The MQWs are grown on AlN nanorods on a sapphire substrate by polarity-selective epitaxy and etching (PSEE) using high-temperature metal organic chemical vapor deposition. The AlN nanorods prepared through PSEE have a low dislocation density because edge dislocations are bent toward neighboring N-polar AlN domains. The core-shell-type MQWs grown on AlN nanorods have three crystallographic orientations, and the final shape of the grown structure is explained by a ball-and-stick model...
January 17, 2018: Scientific Reports
Yu-Xiu Zhang, Xin Jin, Kai-Jun Zhang, Wei-Dong Sun, Jian-Ming Liu, Xiao-Yao Zhou, Li-Long Yan
The Triassic eclogite-bearing central Qiangtang metamorphic belt (CQMB) in the northern Tibetan Plateau has been debated whether it is a metamorphic core complex underthrust from the Jinsha Paleo-Tethys or an in-situ Shuanghu suture. The CQMB is thus a key issue to elucidate the crustal architecture of the northern Tibetan Plateau, the tectonics of the eastern Tethys, and the petrogenesis of Cenozoic high-K magmatism. We here report the newly discovered Baqing eclogite along the eastern extension of the CQMB near the Baqing town, central Tibet...
January 17, 2018: Scientific Reports
Rui Zhang, Tingting Zhou, Lili Wang, Tong Zhang
High sensitive and stable gas sensors have attracted much attention because they are the key to innovations in the fields of environment, health, energy savings and security, etc. Sensing materials, which influence the practical sensing performance, are the crucial parts for gas sensors. Metal-organic frameworks (MOFs) are considered as alluring sensing materials for gas sensors due to the possession of high specific surface area, unique morphology, abundant metal sites and functional linkers. Herein, four kinds of porous hierarchical Co3O4 structures have been selectively controlled by optimizing the thermal decomposition (temperature, rate and atmosphere) using ZIF-67 as precursor that was obtained from coprecipitation method with the co-assistant of cobalt salt and 2-methylimidazole in the solution of methanol...
January 17, 2018: ACS Applied Materials & Interfaces
Selma S Alkafeef, Clinton Yu, Lan Huang, Haoping Liu
The pathogenic fungus Candida albicans can undergo phenotypic switching between two heritable states: white and opaque. This phenotypic plasticity facilitates its colonization in distinct host niches. The master regulator WOR1 is exclusively expressed in opaque phase cells. Positive feedback regulation by Wor1 on the WOR1 promoter is essential for opaque formation, however the underlying mechanism of how Wor1 functions is not clear. Here, we use tandem affinity purification coupled with mass spectrometry to identify Wor1-interacting proteins...
January 16, 2018: PLoS Genetics
Vania Sáez, Camila Gayoso, Sebastián Riquelme, Julie Pérez, Carola Vergara, Claudia Mardones, Dietrich von Baer
Grape canes, the residues from the annual pruning of vines, contain high levels of inducible (E)-resveratrol and also oligomeric stilbenoids and proanthocyanidins. These two families of phenolic compounds are bioactive, but to quantify them in a single chromatographic run using only ultraviolet detection is a difficult task. To overcome this limitation, a chromatographic method was developed using a core shell column for separation, an ultraviolet-visible diode array detector (DAD) and a fluorescence (FL) detector connected in series for quantification, with an electrospray ionization interface (ESI) and a triple quadrupole mass spectrometric detector (MS/MS) added for identification of the analytes...
December 29, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Derek Frydel, Yan Levin
In the present work, we investigate a gas-liquid transition in a two-component Gaussian core model, where particles of the same species repel and those of different species attract. Unlike a similar transition in a one-component system with particles having attractive interactions at long separations and repulsive interactions at short separations, a transition in the two-component system is not driven solely by interactions but by a specific feature of the interactions, the correlations. This leads to extremely low critical temperature, as correlations are dominant in the strong-coupling limit...
January 14, 2018: Journal of Chemical Physics
Bo Song, Jonathan M Waldrop, Xiaopo Wang, Konrad Patkowski
We have developed a new krypton-krypton interaction-induced isotropic dipole polarizability curve based on high-level ab initio methods. The determination was carried out using the coupled-cluster singles and doubles plus perturbative triples method with very large basis sets up to augmented correlation-consistent sextuple zeta as well as the corrections for core-core and core-valence correlation and relativistic effects. The analytical function of polarizability and our recently constructed reference interatomic potential [J...
January 14, 2018: Journal of Chemical Physics
Joel M Don Paul, Elizabeth J Perkins, Prue M Pereira-Fantini, Asha Suka, Olivia Farrell, Julia K Gunn, Anushi E Rajapaksa, David G Tingay
AIM: Maintaining normothermia is a tenet of neonatal care. However, neonatal thermal care guidelines applicable to intra-hospital transport beyond the neonatal intensive care unit (NICU) and during surgery or magnetic resonance imaging (MRI) are lacking. The aim of this study is to determine the proportion of infants normothermic (36.5-37.5°C) on return to NICU after management during surgery and MRI, and during standard clinical care in both environments. METHODS: Sixty-two newborns requiring either surgery in the operating theatre (OT) (n = 41) or an MRI scan (n = 21) at the Royal Children's Hospital (Melbourne) NICU were prospectively studied...
January 13, 2018: Journal of Paediatrics and Child Health
Ariel Jackson, Alaina Strickler, Drew Higgins, Thomas Francisco Jaramillo
Improving the performance of oxygen reduction reaction (ORR) electrocatalysts is essential for the commercial efficacy of many renewable energy technologies, including low temperature polymer electrolyte fuel cells (PEFCs). Herein, we report highly active and stable carbon-supported Ru@Pt core-shell nanoparticles (Ru@Pt/C) prepared by a wet chemical synthesis technique. Through rotating disc electrode testing, the Ru@Pt/C achieves an ORR Pt mass-based activity of 0.50 A mgPt-1 at 0.9 V versus the reversible hydrogen electrode (RHE), which exceeds the activity of the state-of-the-art commercial Pt/C catalyst as well as the Department of Energy 2020 PEFC electrocatalyst activity targets for transportation applications...
January 12, 2018: Nanomaterials
Navid Zanganeh, Vamshi Krishna Guda, Hossein Toghiani, Jason M Keith
A novel gold-copper based silica encapsulated mixed metal oxide (MMO) core-shell catalyst - with sub 5-nm MMO particles - was successfully synthesized via a reverse micelle process. The SiO2 encapsulated MMO catalyst was reduced under hydrogen flow to produce Au-Cu@SiO2 catalyst. XRD and XPS characterization confirmed the presence of Au-Cu nanocomposites in the catalyst while TEM characterization revealed the core-shell structure of the catalyst with the presence of sub 5-nm Au-Cu nanoparticle cores inside SiO2 shells...
January 12, 2018: ACS Applied Materials & Interfaces
Andres Garcia-Ruiz, Alejandro Dominguez-Lopez, Juan Pastor-Graells, Hugo F Martins, Sonia Martin-Lopez, Miguel Gonzalez-Herraez
We demonstrate a technique allowing to develop a fully distributed optical fiber hot-wire anemometer capable of reaching a wind speed uncertainty of ≈ ±0.15m/s (±0.54km/h) at only 60 mW/m of dissipated power in the sensing fiber, and within only four minutes of measurement time. This corresponds to similar uncertainty values than previous papers on distributed optical fiber anemometry but requires two orders of magnitude smaller dissipated power and covers at least one order of magnitude longer distance...
January 8, 2018: Optics Express
Andriy E Serebryannikov, Kamil B Alici, Ekmel Ozbay, Akhlesh Lakhtakia
Temperature-sensitive scattering of terahertz (THz) waves by infinitely long, cylindrical core-shell structures was theoretically studied. Each structure is a dielectric cylinder coated with an InSb shell illuminated by either a transverse-electric (TE) or a transverse-magnetic (TM) plane wave. InSb is a thermally tunable semiconductor showing a transition from dielectric to plasmonic state at THz frequencies. Accordingly, the total scattering efficiency (TSE) can be thermally tuned for both polarization states of the incident plane wave...
January 8, 2018: Optics Express
Ce Bian, Manli Hu, Ruohui Wang, Tingting Gang, Rongxin Tong, Lisong Zhang, Teng Guo, Xiaobo Liu, Xueguang Qiao
An optical fiber humidity sensor based on an optical Fabry-Perot interferometer is proposed and experimentally demonstrated. The sensor is constructed by a short section of hollow-core fiber coated with a polyimide (PI) film. Taking advantage of the direct response of the PI film, a sensitivity of up to 1.309 nm/%RH can be achieved in the humidity change range from 40% RH to 80% RH. The temperature sensitivity is measured to be 43.57 pm/°C when the temperature changes from 25°C to 55°C. Because of its simple structure, fast response time, convenient production, and good reproducibility, the proposed sensor will be competitive in the field of cultural relic humidity monitoring and pharmaceutical storage...
January 10, 2018: Applied Optics
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