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https://www.readbyqxmd.com/read/27925725/analogy-between-the-hidden-order-and-the-orbital-antiferromagnetism-in-uru_-2-x-fe_-x-si_-2
#1
H-H Kung, S Ran, N Kanchanavatee, V Krapivin, A Lee, J A Mydosh, K Haule, M B Maple, G Blumberg
We study URu_{2-x}Fe_{x}Si_{2}, in which two types of staggered phases compete at low temperature as the iron concentration x is varied: the nonmagnetic "hidden order" (HO) phase below the critical concentration x_{c}, and unconventional antiferromagnetic (AFM) phase above x_{c}. By using polarization resolved Raman spectroscopy, we detect a collective mode of pseudovectorlike A_{2g} symmetry whose energy continuously evolves with increasing x; it monotonically decreases in the HO phase until it vanishes at x=x_{c}, and then reappears with increasing energy in the AFM phase...
November 25, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27925421/reducing-the-incidence-of-hospital-associated-venous-thromboembolism-within-a-network-of-academic-hospitals-findings-from-five-university-of-california-medical-centers
#2
REVIEW
Ian H Jenkins, Richard H White, Alpesh N Amin, Nasim Afsarmanesh, Andrew D Auerbach, Raman Khanna, Gregory A Maynard
BACKGROUND: Almost 700 patients suffered from hospital-associated venous thromboembolism (HA-VTE) across 5 University of California hospitals in calendar year 2011. OBJECTIVE: Optimize venous thromboembolism (VTE) prophylaxis (VTEP) in adult medical/surgical inpatients and reduce HA-VTE by at least 20% within 3 years. DESIGN: Prospective, unblinded, open-intervention study with historical controls. SETTING: Five independent but cooperating academic hospitals...
December 2016: Journal of Hospital Medicine: An Official Publication of the Society of Hospital Medicine
https://www.readbyqxmd.com/read/27925412/in-situ-raman-spectroscopic-studies-on-concentration-of-electrolyte-salt-in-lithium-ion-batteries-by-using-ultrafine-multi-fiber-probes
#3
Toshiro Yamanaka, Hiroe Nakagawa, Shigetaka Tsubouchi, Yasuhiro Domi, Takayuki Doi, Takeshi Abe, Zempachi Ogumi
Lithium ion batteries have attracted considerable attention due to their high power density. The change in concentration of salt in the electrolyte solution in lithium ion batteries during operation causes serious degradation of battery performance. In this work, a new method of in situ Raman spectroscopy using ultrafine multi-fiber probes was developed to simultaneously study the concentrations of ions at several different positions in the electrolyte solution in deep narrow spaces between the electrodes in batteries...
December 7, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27924983/detection-of-the-tuberculosis-antigenic-marker-mannose-capped-lipoarabinomannan-in-pretreated-serum-by-surface-enhanced-raman-scattering
#4
Alexis C Crawford, Lars B Laurentius, Timothy S Mulvihill, Jennifer H Granger, John S Spencer, Delphi Chatterjee, Kimberly E Hanson, Marc D Porter
The ability to detect tuberculosis (TB) continues to be a global health care priority. This paper describes the development and preliminary assessment of the clinical accuracy of a heterogeneous immunoassay that integrates a serum pretreatment process with readout by surface-enhanced Raman scattering (SERS) for the low-level detection of mannose-capped lipoarabinomannan (ManLAM). ManLAM is a major virulence factor in the infectious pathology of Mycobacterium tuberculosis (Mtb) that has been found in the serum and other body fluids of infected patients...
December 7, 2016: Analyst
https://www.readbyqxmd.com/read/27924948/foxa1-gata3-and-ppar%C3%A9-cooperate-to-drive-luminal-subtype-in-bladder-cancer-a-molecular-analysis-of-established-human-cell-lines
#5
Joshua I Warrick, Vonn Walter, Hironobu Yamashita, Eunah Chung, Lauren Shuman, Vasty Osei Amponsa, Zongyu Zheng, Wilson Chan, Tiffany L Whitcomb, Feng Yue, Tejaswi Iyyanki, Yuka I Kawasawa, Matthew Kaag, Wansong Guo, Jay D Raman, Joo-Seop Park, David J DeGraff
Discrete bladder cancer molecular subtypes exhibit differential clinical aggressiveness and therapeutic response, which may have significant implications for identifying novel treatments for this common malignancy. However, research is hindered by the lack of suitable models to study each subtype. To address this limitation, we classified bladder cancer cell lines into molecular subtypes using publically available data in the Cancer Cell Line Encyclopedia (CCLE), guided by genomic characterization of bladder cancer by The Cancer Genome Atlas (TCGA)...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27924863/high-performance-sers-substrate-based-on-hybrid-structure-of-graphene-oxide-agnps-cu-film-pyramid-si
#6
Zhe Li, Shi Cai Xu, Chao Zhang, Xiao Yun Liu, Sai Sai Gao, Li Tao Hu, Jia Guo, Yong Ma, Shou Zhen Jiang, Hai Peng Si
We present a novel surface-enhanced Raman scattering (SERS) substrate based on graphene oxide/silver nanoparticles/copper film covered silicon pyramid arrays (GO/AgNPs/PCu@Si) by a low-cost and simple method. The GO/AgNPs/PCu@Si substrate presents high sensitivity, good homogeneity and well stability with R6G molecules as a probe. The detected concentration of Rhodamine 6 G (R6G) is as low as 10(-15) M. These sensitive SERS behaviors are also confirmed in theory via a commercial COMSOL software, the electric field enhancement is not only formed between the AgNPs, but also formed between the AgNPs and Cu film...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27924843/exploring-the-coordination-change-of-vanadium-and-structure-transformation-of-metavanadate-mgv2o6-under-high-pressure
#7
Ruilian Tang, Yan Li, Shengyi Xie, Nana Li, Jiuhua Chen, Chunxiao Gao, Pinwen Zhu, Xin Wang
Raman spectroscopy, synchrotron angle-dispersive X-ray diffraction (ADXRD), first-principles calculations, and electrical resistivity measurements were carried out under high pressure to investigate the structural stability and electrical transport properties of metavanadate MgV2O6. The results have revealed the coordination change of vanadium ions (from 5+1 to 6) at around 4 GPa. In addition, a pressure-induced structure transformation from the C2/m phase to the C2 phase in MgV2O6 was detected above 20 GPa, and both phases coexisted up to the highest pressure...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27924786/evolution-of-a-high-local-strain-in-rolling-up-mos2-sheets-decorated-with-ag-and-au-nanoparticles-for-surface-enhanced-raman-scattering
#8
Da Young Hwang, Dong Hack Suh
We report that a high local strain was obtained for multilayer MoS2 nanoscrolls decorated with noble nanoparticles (Ag and Au NPs) using a rolling process beyond breaking or slipping of MoS2. The local strain was estimated through the bending strain in the nanoscrolls and the extent of coverage of Ag and Au NPs decorated on MoS2, exhibiting magnified surface-enhanced Raman scattering. TEM images showed that the MoS2-Ag and MoS2-Au nanoscrolls have a tube-like morphology decorated with NPs on the inner and outer sides of the MoS2 nanoscrolls...
January 13, 2017: Nanotechnology
https://www.readbyqxmd.com/read/27924785/electrical-properties-of-bilayer-graphene-synthesized-using%C3%A2-surface-wave-microwave-plasma-techniques-at-low-temperature
#9
Takatoshi Yamada, Hiromitsu Kato, Yuki Okigawa, Masatou Ishihara, Masataka Hasegawa
Bilayer graphene was synthesized at low temperature using surface wave microwave plasma techniques where poly(methyl metacrylate) (PMMA) and methane (CH4) were used as carbon sources. Temperature-dependent Hall effect measurements were carried out in a helium atmosphere. Sheet resistance, sheet carrier density and mobility showed weak temperature dependence for graphene from PMMA, and the highest carrier mobility is 740 cm(2) V(-1) s(-1). For graphene from CH4, tunneling of the domain boundary limited carrier transport...
January 13, 2017: Nanotechnology
https://www.readbyqxmd.com/read/27924765/india-s-new-health-systems-knowledge-platform-making-research-matter
#10
Kabir Sheikh, Sanjiv Kumar, Rajani Ved, Satish Kumar, V R Raman, Abdul Ghaffar, Nhan Tran, Srinath Reddy, Soumya Swaminathan
No abstract text is available yet for this article.
December 3, 2016: Lancet
https://www.readbyqxmd.com/read/27923211/study-of-the-thermal-stability-of-studtite-by-in-situ-raman-spectroscopy-and-dft-calculations
#11
Francisco Colmenero, Laura J Bonales, Joaquín Cobos, Vicente Timón
The design of a safe spent nuclear fuel repository requires the knowledge of the stability of the secondary phases which precipitate when water reaches the fuel surface. Studtite is recognized as one of the secondary phases that play a key-role in the mobilization of the radionuclides contained in the spent fuel. Thereby, it has been identified as a product formed under oxidation conditions at the surface of the fuel, and recently found as a corrosion product in the Fukushima-Daiichi nuclear plant accident...
November 29, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/27923170/instant-detection-and-identification-of-concealed-explosive-related-compounds-induced-stokes-raman-versus-infrared
#12
Sherif Elbasuney, Ashraf F El-Sherif
The instant detection of explosives and explosive-related compounds has become an urgent priority in recent years for homeland security and counter-terrorism applications. Modern techniques should offer enhancement in selectivity, sensitivity, and standoff distances. Miniaturisation, portability, and field-ruggedisation are crucial requirements. This study reports on instant and standoff identification of concealed explosive-related compounds using customized Raman technique. Stokes Raman spectra of common explosive-related compounds were generated and spectrally resolved to create characteristic finger print spectra...
November 30, 2016: Forensic Science International
https://www.readbyqxmd.com/read/27922887/regional-cerebral-abnormalities-measured-by-frequency-domain-near-infrared-spectroscopy-in-pediatric-patients-during-extracorporeal-membrane-oxygenation
#13
Fenghua Tian, Christopher Jenks, Donald Potter, Darryl Miles, Lakshmi Raman
Extracorporeal membrane oxygenation (ECMO) is a form of advanced cardio-respiratory support provided to critically ill patients with severe respiratory and/or cardiovascular failure. While children undergoing ECMO therapy have significant risk for neurological morbidity, currently there is a lack of reliable bedside tool to detect the neurologic events for patients on ECMO. This study assessed the feasibility of frequency-domain near-infrared spectroscopy (NIRS) for detection of intracranial complications during ECMO therapy...
December 2, 2016: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/27922833/x-ray-photoelectron-spectroscopy-and-transmission-electron-microscopy-analysis-of-silver-coated-gold-nanorods-designed-for-bionanotechnology-applications
#14
Fumiya Watanabe, Zeid A Nima, Takumi Honda, Masatoshi Mitsuhara, Minoru Nishida, Alexandru S Biris
Multicomponent nano-agents were designed and built via a core-shell approach to enhance their surface enhanced Raman scattering (SERS) signals. These nano-agents had 36 nm × 12 nm gold nanorod cores coated by 4 nm thick silver shell films and a subsequent thin bifunctional thiolated polyethylene glycol (HS-PEG-COOH) layer. Ambient time-lapsed SERS signal measurements of these functionalized nanorods taken over a two-week period indicated no signal degradation, suggesting that large portions of the silver shells remained in pure metallic form...
December 6, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27922133/photoluminescence-changes-of-c70-nano-submicro-crystals-induced-by-high-pressure-and-high-temperature
#15
Dedi Liu, Bingbing Liu, Bertil Sundqvist, Dapeng Dong, Zhenghua Li, Dongping Liu
Hollow C70 nano/submicro-crystals with a fcc lattice structure were treated under various high pressure and high temperature conditions. The energy band structure was visibly changed by the high pressure and high temperature treatment, and the luminescence of the treated C70 nano/submicro-crystals were tuned from the visible to the near infrared range. In-situ high pressure experiments at room temperature indicate that pressure plays a key role in the tuning of the band gap and PL properties in C70 nanocrystals, and temperature plays an important role in the formation of stable intermolecular bonds and thus to define the final red-shift of the PL peaks...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27922062/enhanced-self-organized-dewetting-of-ultrathin-polymer-blend-film-for-large-area-fabrication-of-sers-substrate
#16
Huanhuan Zhang, Lin Xu, Yabo Xu, Gang Huang, Xueyu Zhao, Yuqing Lai, Tongfei Shi
We study the enhanced dewetting of ultrathin Polystyrene (PS)/Poly (methyl methacrylate) (PMMA) blend films in a mixed solution, and reveal the dewetting can act as a simple and effective method to fabricate large-area surface-enhanced Raman scattering (SERS) substrate. A bilayer structure consisting of under PMMA layer and upper PS layer forms due to vertical phase separation of immiscible PS/PMMA during the spin-coating process. The thicker layer of the bilayer structure dominates the dewetting structures of PS/PMMA blend films...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27922033/profilometry-of-thin-films-on-rough-substrates-by-raman-spectroscopy
#17
Martin Ledinský, Bertrand Paviet-Salomon, Aliaksei Vetushka, Jonas Geissbühler, Andrea Tomasi, Matthieu Despeisse, Stefaan De Wolf, Christophe Ballif, Antonín Fejfar
Thin, light-absorbing films attenuate the Raman signal of underlying substrates. In this article, we exploit this phenomenon to develop a contactless thickness profiling method for thin films deposited on rough substrates. We demonstrate this technique by probing profiles of thin amorphous silicon stripes deposited on rough crystalline silicon surfaces, which is a structure exploited in high-efficiency silicon heterojunction solar cells. Our spatially-resolved Raman measurements enable the thickness mapping of amorphous silicon over the whole active area of test solar cells with very high precision; the thickness detection limit is well below 1 nm and the spatial resolution is down to 500 nm, limited only by the optical resolution...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27921368/competing-mechanisms-in-the-acetaldehyde-functionalization-of-positively-charged-hydrogenated-silicene
#18
Li-Kun Yang, Xia-Guang Zhang, Fang-Zu Yang, De-Yin Wu, Zhong-Qun Tian, Xiang-Yang Liu
Density functional theory calculations have been used to elucidate the mechanism of the addition reaction of acetaldehyde to the positively charged hydrogenated silicene (H-silicene). We find that the positively charged H-silicene plane could be partially restructured to form a vacant Si site, enabling a further nucleophilic addition reaction. After acetaldehyde molecule attached to the H-silicene plane, two competing pathways are involved in hydrogen abstraction process: a random reaction mechanism and a chain reaction mechanism...
December 6, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/27921145/compressive-loading-of-the-murine-tibia-reveals-site-specific-micro-scale-differences-in-adaptation-and-maturation-rates-of-bone
#19
I Bergström, J G Kerns, A E Törnqvist, C Perdikouri, N Mathavan, A Koskela, H B Henriksson, J Tuukkanen, G Andersson, H Isaksson, A E Goodship, S H Windahl
: Loading increases bone mass and strength in a site-specific manner; however, possible effects of loading on bone matrix composition have not been evaluated. Site-specific structural and material properties of mouse bone were analyzed on the macro- and micro/molecular scale in the presence and absence of axial loading. The response of bone to load is heterogeneous, adapting at molecular, micro-, and macro-levels. INTRODUCTION: Osteoporosis is a degenerative disease resulting in reduced bone mineral density, structure, and strength...
December 5, 2016: Osteoporosis International
https://www.readbyqxmd.com/read/27920917/redetermination-of-metarossite-cav-5-2o6%C3%A2-2h2o
#20
Anaïs Kobsch, Robert T Downs, Kenneth J Domanik
The crystal structure of metarossite, ideally CaV2O6·2H2O [chemical name: calcium divanadium(V) hexa-oxide dihydrate], was first determined using precession photographs, with fixed isotropic displacement parameters and without locating the positions of the H atoms, leading to a reliability factor R = 0.11 [Kelsey & Barnes (1960 ▸). Can. Mineral.6, 448-466]. This communication reports a structure redetermination of this mineral on the basis of single-crystal X-ray diffraction data of a natural sample from the Blue Cap mine, San Juan County, Utah, USA (R1 = 0...
September 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
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