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https://www.readbyqxmd.com/read/28448115/high-temperature-superconductivity-in-boron-doped-q-carbon
#1
Anagh Bhaumik, Ritesh Sachan, Jagdish Narayan
We report high-temperature superconductivity in B-doped amorphous quenched carbon (Q-carbon). This phase is formed after nanosecond laser melting of B-doped amorphous carbon films in a super undercooled state and followed by rapid quenching. Magnetic susceptibility measurements show the characteristics of type-II Bardeen-Cooper-Schrieffer superconductivity with a superconducting transition temperature (Tc) of 36.0±0.5 K for 17.0±1.0 atomic percent boron concentration. This value is significantly higher than the best experimentally reported Tc of 11 K for crystalline B-doped diamond...
April 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28447702/structures-in-the-meniscus-of-smectic-membranes-the-role-of-dislocations
#2
M Selmi, J-C Loudet, P V Dolganov, T Othman, P Cluzeau
We report an experimental investigation of the structure of periodic patterns observed in the meniscus of free-standing smectic films. Combination of polarizing optical microscopy and phase shifting interferometry enabled us to obtain new information on the structure of the meniscus, and in particular, on the topography of the smectic-air interface. We investigate the profile of the undulations in the striped structure in the thin part of the meniscus, change of the stripe period with the meniscus thickness and subsequent transition into a two-dimensional structure...
April 27, 2017: Soft Matter
https://www.readbyqxmd.com/read/28447489/forodesine-in-the-treatment-of-cutaneous-t-cell-lymphoma
#3
Daniel J Lewis, Madeleine Duvic
Cutaneous T-cell lymphoma (CTCL) is characterized by the accumulation of neoplastic CD4+ T lymphocytes in the skin. Given the lack of curative treatments for CTCL, there is a significant need for new, superior therapies. Forodesine is a transition-state analogue that inhibits purine nucleoside phosphorylase. Because it selectively targets T lymphocytes, it represents a drug of interest for the treatment of CTCL. Areas covered: Phase I/II dose-ranging studies of intravenous (IV) and oral forodesine demonstrated its activity, safety, and tolerability for refractory CTCL...
April 27, 2017: Expert Opinion on Investigational Drugs
https://www.readbyqxmd.com/read/28447096/the-effect-of-k-cations-on-the-phase-transitions-and-structural-dielectric-and-luminescence-properties-of-cat-k0-5cr0-5-hcoo-3-where-cat-is-protonated-dimethylamine-or-ethylamine
#4
Maciej Ptak, Anna Gągor, Adam Sieradzki, Bartosz Bondzior, Przemysław Dereń, Aneta Ciupa, M Trzebiatowska, Mirosław Mączka
We report the synthesis, crystal structure, and dielectric, vibrational and emission spectra of two novel heterometallic perovskite-type metal-organic frameworks (MOFs) of the following formula: [(CH3)2NH2][K0.5Cr0.5(HCOO)3] (DMAKCr) and [C2H5NH3][K0.5Cr0.5(HCOO)3] (EtAKCr). DMAKCr crystallizes in a trigonal structure (R3[combining macron] space group) and undergoes an order-disorder phase transition to the monoclinic system (P1[combining macron] space group) at about 190 K. The dielectric studies confirm the presence of first-order relaxor-like structural transformation...
April 27, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28447095/investigation-of-the-metal-insulator-transition-in-ndnio3-films-by-site-selective-x-ray-absorption-spectroscopy
#5
Natalia Palina, Le Wang, Sibashisa Dash, Xiaojiang Yu, Mark B H Breese, Junling Wang, Andrivo Rusydi
In this work, multifunctional oxide NdNiO3 (NNO) thin films grown on a SrTiO3 (STO) substrate using pulsed-laser deposition are studied. Temperature dependent resistivity measurements revealed that NNO/STO samples exhibit a sharp thickness dependent metal-insulator transition (MIT) over a range of 150-200 K. It is known that the electronic properties of correlated oxides are extremely complex and sensitive to changes in orbital occupancy. To evaluate the changes in the electronic and/or crystallographic structure responsible for the MIT, a site-selective (O, Ni and Nd) X-ray absorption near edge structure (XANES) analysis is performed above and below the transition temperature...
April 27, 2017: Nanoscale
https://www.readbyqxmd.com/read/28447080/doping-of-nematic-cyanobiphenyl-liquid-crystals-with-mesogen-hybridized-magnetic-nanoparticles
#6
Ingo Appel, Hajnalka Nádasi, Christian Reitz, Nerea Sebastián, Horst Hahn, Alexey Eremin, Ralf Stannarius, Silke S Behrens
Magnetic nanoparticles (MNPs) functionalized with (pro-)mesogenic ligands are implemented into a nematic liquid crystal (LC) and studied regarding both colloidal stability and magneto-optical behavior. In this study, the particle surface is specifically engineered to tune the MNP interactions with the LC host. For this purpose, four types of (pro-)mesogenic ligands (ML) are synthesized, which are composed of three structural parts, i.e., a rigid, LC motif (i.e., cyanobiphenyl) and a functional group for nanoparticle binding, both linked via a flexible spacer of different alkyl chain lengths...
April 27, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28446780/holocene-winter-climate-variability-in-central-and-eastern-europe
#7
Aurel Perșoiu, Bogdan P Onac, Jonathan G Wynn, Maarten Blaauw, Monica Ionita, Margareta Hansson
Among abundant reconstructions of Holocene climate in Europe, only a handful has addressed winter conditions, and most of these are restricted in length and/or resolution. Here we present a record of late autumn through early winter air temperature and moisture source changes in East-Central Europe for the Holocene, based on stable isotopic analysis of an ice core recovered from a cave in the Romanian Carpathian Mountains. During the past 10,000 years, reconstructed temperature changes followed insolation, with a minimum in the early Holocene, followed by gradual and continuous increase towards the mid-to-late-Holocene peak (between 4-2 kcal BP), and finally by a decrease after 0...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28446768/linear-dynamics-of-classical-spin-as-m%C3%A3-bius-transformation
#8
Alexey Galda, Valerii М Vinokur
Though the overwhelming majority of natural processes occur far from the equilibrium, general theoretical approaches to non-equilibrium phase transitions remain scarce. Recent breakthroughs introduced a description of open dissipative systems in terms of non-Hermitian quantum mechanics enabling the identification of a class of non-equilibrium phase transitions associated with the loss of combined parity (reflection) and time-reversal symmetries. Here we report that the time evolution of a single classical spin (e...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28446754/phonon-mediated-repulsion-sharp-transitions-and-quasi-self-trapping-in-the-extended-peierls-hubbard-model
#9
J Sous, M Chakraborty, C P J Adolphs, R V Krems, M Berciu
We study two identical fermions, or two hard-core bosons, in an infinite chain and coupled to phonons by interactions that modulate their hopping as described by the Peierls/Su-Schrieffer-Heeger (SSH) model. We show that exchange of phonons generates effective nearest-neighbor repulsion between particles and also gives rise to interactions that move the pair as a whole. The two-polaron phase diagram exhibits two sharp transitions, leading to light dimers at strong coupling and the flattening of the dimer dispersion at some critical values of the parameters...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28446612/cdk4-is-degraded-by-apc-c-in-mitosis-and-reaccumulates-in-early-g1-phase-to-initiate-a-new-cell-cycle-in-hela-cells
#10
Huabo Chen, Xiaowei Xu, Guopeng Wang, Boyan Zhang, Gang Wang, Guangwei Xin, Junjun Liu, Qing Jiang, Hongyin Zhang, Chuanmao Zhang
CDK4 regulates G1-S phase transition in mammalian cell cycle by phosphorylating retinoblastoma family proteins. However, the mechanism underlying the regulation of CDK4 activity is not fully understood. Here, we show that CDK4 protein is degraded by APC/C during metaphase-anaphase (M-A) transition in HeLa cells, whereas its main regulator cyclin D1 remains intact but is sequestered in cytoplasm. CDK4 protein reaccumulates in the following G1 phase, and shuttles between the nucleus and the cytoplasm to facilitate the nuclear import of cyclin D1...
April 26, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28446221/effectiveness-of-three-commonly-used-transition-phase-diets-in-the-inpatient-management-of-children-with-severe-acute-malnutrition-a-pilot-randomized-controlled-trial-in-malawi
#11
Christian J Versloot, Wieger Voskuijl, Sara J van Vliet, Meta van den Heuvel, Jane C Carter, Ajib Phiri, Marko Kerac, Geert Tom Heikens, Patrick F van Rheenen, Robert H J Bandsma
BACKGROUND: The case fatality rate of severely malnourished children during inpatient treatment is high and mortality is often associated with diarrhea. As intestinal carbohydrate absorption is impaired in severe acute malnutrition (SAM), differences in dietary formulations during nutritional rehabilitation could lead to the development of osmotic diarrhea and subsequently hypovolemia and death. We compared three dietary strategies commonly used during the transition of severely malnourished children to higher caloric feeds, i...
April 26, 2017: BMC Pediatrics
https://www.readbyqxmd.com/read/28445989/tmprss2-erg-gene-fusion-variants-induce-tgf-%C3%AE-signaling-and-epithelial-to-mesenchymal-transition-in-human-prostate-cancer-cells
#12
Leonie Ratz, Mark Laible, Lukasz A Kacprzyk, Stephanie M Wittig-Blaich, Yanis Tolstov, Stefan Duensing, Peter Altevogt, Sabine M Klauck, Holger Sültmann
TMPRSS2:ERG (T/E) gene fusions are present in approximately 50% of all prostate cancer (PCa) cases. The expression of fusion mRNAs from distinct T/E variants is associated with clinicopathological parameters, while the underlying molecular processes remain unclear. We characterized the molecular mechanisms and functional implications caused by doxycycline (Dox)-inducible overexpression of the frequent T/E III and VI fusion variants in LNCaP cells. Induction of T/E expression resulted in increased cellular migratory and invasive potential, and reduced proliferation and accumulation in G1 phase...
April 11, 2017: Oncotarget
https://www.readbyqxmd.com/read/28445533/influence-of-temperature-on-daily-locomotor-activity-in-the-crab-uca-pugilator
#13
Audrey M Mat, Gideon P Dunster, Valerio Sbragaglia, Jacopo Aguzzi, Horacio O de la Iglesia
Animals living in the intertidal zone are exposed to prominent temperature changes. To cope with the energetic demands of environmental thermal challenges, ectotherms rely mainly on behavioral responses, which may change depending on the time of the day and seasonally. Here, we analyze how temperature shapes crabs' behavior at 2 different times of the year and show that a transition from constant cold (13.5°C) to constant warm (17.5°C) water temperature leads to increased locomotor activity levels throughout the day in fiddler crabs (Uca pugilator) collected during the summer...
2017: PloS One
https://www.readbyqxmd.com/read/28444877/identification-and-measurement-of-staphylococcal-enterotoxin-m-sem-from-staphylococcus-aureus-isolate-associated-with-staphylococcal-food-poisoning
#14
Yanying Zhao, Anni Zhu, Junni Tang, Cheng Tang, Juan Chen
Staphylococcus aureus (S. aureus) produces a wide variety of staphylococcal enterotoxins (SEs, SEA to SEX), which are responsible for staphylococcal food poisoning. This study is aimed to establish a system to detect SEM protein in food matrixes. In the present study, sem gene was characterized in a S. aureus isolate H4 associated with food poisoning. The amino acid sequence of the deduced SEM protein was same as that of previously identified SEM from S. aureus 04-02981. Subsequently, mature SEM protein was expressed in E...
April 26, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28444759/dysregulated-cd46-shedding-interferes-with-th1-contraction-in-systemic-lupus-erythematosus
#15
Ursula Ellinghaus, Andrea Cortini, Christopher L Pinder, Gaelle Le Friec, Claudia Kemper, Timothy J Vyse
IFN-γ-producing T helper 1 (Th1) cell responses mediate protection against infections but uncontrolled Th1 activity also contributes to a broad range of autoimmune diseases. Autocrine complement activation has recently emerged as key in the induction and contraction of human Th1 immunity: Activation of the complement regulator CD46 and the C3aR expressed by CD4(+) T cells via autocrine generated ligands C3b and C3a, respectively, are critical to IFN-γ production. Further, CD46-mediated signals also induce co-expression of immunosuppressive IL-10 in Th1 cells and transition into a (self)-regulating and contracting phase...
April 26, 2017: European Journal of Immunology
https://www.readbyqxmd.com/read/28443877/nmr-of-molecular-endofullerenes-dissolved-in-a-nematic-liquid-crystal
#16
Karel Kouřil, Christopher Wickens, Benno Meier, Shamim Alom, John Gräsvik, Richard J Whitby, Malcolm H Levitt
We report the NMR of the molecular endofullerenes H2@C60, H2O@C60 and HF@C60 dissolved in the nematic liquid crystal N-(4-methoxybenzylidene)-4-butylaniline (MBBA). The (1)H NMR lines of H2 and H2O display a doublet splitting due to residual dipole-dipole coupling. The dipolar splitting depends on temperature in the nematic phase and vanishes above the nematic-isotropic phase transition. The (19)F spectrum of HF@C60 dissolved in MBBA displays a doublet splitting in the nematic phase, with contributions from the (1)H-(19)F dipole-dipole coupling and J-coupling...
April 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28443107/virus-based-microrna-silencing-and-overexpressing-in-common-wheat-triticum-aestivum-l
#17
Chao Jian, Ran Han, Qing Chi, Shijuan Wang, Meng Ma, Xiangli Liu, Huixian Zhao
MicroRNAs (miRNAs) are a class of endogenous small non-coding RNAs that arise from large RNA precursors with a stem-loop structure and play important roles in plant development and responses to environmental stress. Although a hundred and nineteen wheat miRNAs have been identified and registered in the miRBase (Release 21.0, June, 2014; http://www.mirbase.org), the functional characterization of these miRNAs in wheat growth and development is lagging due to lack of effective techniques to investigate endogenous miRNA functions in wheat...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28442731/glag-theory-for-superconducting-property-variations-with-a15-composition-in-nb3sn-wires
#18
Yingxu Li, Yuanwen Gao
We present a model for the variation of the upper critical field H c2 with Sn content in A15-type Nb-Sn wires, within the Ginzburg-Landau-Abrikosov-Gor'kov (GLAG) theory frame. H c2 at the vicinity of the critical temperature T c is related quantitatively to the electrical resistivity ρ, specific heat capacity coefficient γ and T c. H c2 versus tin content is theoretically formulated within the GLAG theory, and generally reproduces the experiment results. As Sn content gradually approaches the stoichiometry, A15-type Nb-Sn undergoes a transition from the dirty limit to clean limit, split by the phase transformation boundary...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28442718/pressure-induced-structural-change-in-liquid-gain-eutectic-alloy
#19
Q Yu, A S Ahmad, K Ståhl, X D Wang, Y Su, K Glazyrin, H P Liermann, H Franz, Q P Cao, D X Zhang, J Z Jiang
Synchrotron x-ray diffraction reveals a pressure induced crystallization at about 3.4 GPa and a polymorphic transition near 10.3 GPa when compressed a liquid GaIn eutectic alloy up to ~13 GPa at room temperature in a diamond anvil cell. Upon decompression, the high pressure crystalline phase remains almost unchanged until it transforms to the liquid state at around 2.3 GPa. The ab initio molecular dynamics calculations can reproduce the low pressure crystallization and give some hints on the understanding of the transition between the liquid and the crystalline phase on the atomic level...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28441141/crystal-growth-and-stoichiometry-dependent-properties-of-the-ferromagnetic-weyl-semimetal-zrco2-x-sn
#20
Satya K Kushwaha, Karoline Stolze, Zhijun Wang, Max Hirschberger, Jingjing Lin, B Andrei Bernevig, N Phuan Ong, Robert J Cava
We report the growth of high quality bulk crystals, through crystallization from molten Sn flux, of the predicted ferromagnetic Weyl metal ZrCo2-x Sn with the L21 Heusler phase structure. The concentration of Co vacancies in the single crystals is found to be dependent on the initial concentration of Co in the flux. The saturation magnetization increases approximately linearly with decreasing Co deficiency and the ferromagnetic transition temperature changes significantly. p-type carrier conduction and an anomalous Hall effect are observed...
April 25, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
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