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https://www.readbyqxmd.com/read/28549380/synthesis-of-pyridinic-rich-n-s-co-doped-carbon-quantum-dots-as-effective-enzyme-mimics
#1
Teng Liu, Zhi-Wei Cui, Jun Zhou, Ying Wang, Zhi-Gang Zou
N and S co-doped carbon quantum dots (N, S-CQDs) with high N- and S-doping level were synthesized by microwave solid-phase pyrolysis within 50 s. Owing to the dominant pyridinic N injection into the conjugated framework, both high enzyme mimics catalytic activity and photoluminescence quantum yield are achieved simultaneously.
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28548709/-polka-dot-macrophages-on-cytology-of-bilateral-adrenal-masses-nailing-disseminated-histoplasmosis
#2
Sumit Grover, Pavneet Kaur Selhi, Neena Sood, Ridhi Sood, Harpreet Kaur
Histoplasma capsulatum is a saprophytic fungus that in immunocompetent individuals causes self-limited pulmonary infection; however, in immunosuppressed patients involvement of the reticuloendothelial system, alimentary tract, urinary tract, and central nervous system is fairly common. Rarely patients present with bilateral adrenal masses which mimic tuberculosis and metastasis on radiology because of associated central necrosis. Ultrasound guided FNAC aided by special stains like Periodic Acid Schiff (PAS) and Gomori Methenamine Silver (GMS) may help in early diagnosis in such dubious cases...
May 26, 2017: Diagnostic Cytopathology
https://www.readbyqxmd.com/read/28548532/time-bin-encoded-boson-sampling-with-a-single-photon-device
#3
Yu He, X Ding, Z-E Su, H-L Huang, J Qin, C Wang, S Unsleber, C Chen, H Wang, Y-M He, X-L Wang, W-J Zhang, S-J Chen, C Schneider, M Kamp, L-X You, Z Wang, S Höfling, Chao-Yang Lu, Jian-Wei Pan
Boson sampling is a problem strongly believed to be intractable for classical computers, but can be naturally solved on a specialized photonic quantum simulator. Here, we implement the first time-bin-encoded boson sampling using a highly indistinguishable (∼94%) single-photon source based on a single quantum-dot-micropillar device. The protocol requires only one single-photon source, two detectors, and a loop-based interferometer for an arbitrary number of photons. The single-photon pulse train is time-bin encoded and deterministically injected into an electrically programmable multimode network...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28548522/zero-phase-difference-josephson-current-based-on-spontaneous-symmetry-breaking-via-parametric-excitation-of-a-movable-superconducting-dot
#4
A M Eriksson, A Vikström
Recent advances have attracted attention to nonstandard Josephson junctions in which a supercurrent can flow despite zero phase difference between the constituent superconducting leads. Here, we propose a zero-phase-difference nanoelectromechanical junction which, in contrast to other considered systems, exhibits symmetry between leftward and rightward tunneling through the junction. We show that a supercurrent is, nevertheless, possible as a result of spontaneous symmetry breaking. In the suggested junction, the supercurrent is mediated by tunneling via a superconducting Cooper-pair box on a mechanical resonator...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28548512/quantum-fluctuations-along-symmetry-crossover-in-a-kondo-correlated-quantum-dot
#5
Meydi Ferrier, Tomonori Arakawa, Tokuro Hata, Ryo Fujiwara, Raphaëlle Delagrange, Richard Deblock, Yoshimichi Teratani, Rui Sakano, Akira Oguri, Kensuke Kobayashi
Universal properties of entangled many-body states are controlled by their symmetry and quantum fluctuations. By the magnetic-field tuning of the spin-orbital degeneracy in a Kondo-correlated quantum dot, we have modified quantum fluctuations to directly measure their influence on the many-body properties along the crossover from SU(4) to SU(2) symmetry of the ground state. High-sensitive current noise measurements combined with the nonequilibrium Fermi liquid theory clarify that the Kondo resonance and electron correlations are enhanced as the fluctuations, measured by the Wilson ratio, increase along the symmetry crossover...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28548170/efficient-quantum-dot-light-emitting-diodes-with-a-zn0-85mg0-15o-interfacial-modification-layer
#6
Yizhe Sun, Yibin Jiang, Huiren Peng, Jiangliu Wei, Shengdong Zhang, Shuming Chen
Efficient inverted quantum-dot (QD) light-emitting diodes (LEDs) are demonstrated by using 15% Mg doped ZnO (Zn0.85Mg0.15O) as an interfacial modification layer. By doping Mg into ZnO, the conduction band level, the density of oxygen vacancies and the conductivity of the ZnO can be tuned. To suppress excess electron injection, a 13 nm Zn0.85Mg0.15O interlayer with a relatively higher conduction band edge and lower conductivity is inserted between the ZnO electron transport layer and QD light-emitting layer, which improves the balance of charge injection and blocks the non-radiative pathway...
May 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28548092/solid-state-ensemble-of-highly-entangled-photon-sources-at-rubidium-atomic-transitions
#7
Robert Keil, Michael Zopf, Yan Chen, Bianca Höfer, Jiaxiang Zhang, Fei Ding, Oliver G Schmidt
Semiconductor InAs/GaAs quantum dots grown by the Stranski-Krastanov method are among the leading candidates for the deterministic generation of polarization-entangled photon pairs. Despite remarkable progress in the past 20 years, many challenges still remain for this material, such as the extremely low yield, the low degree of entanglement and the large wavelength distribution. Here, we show that with an emerging family of GaAs/AlGaAs quantum dots grown by droplet etching and nanohole infilling, it is possible to obtain a large ensemble of polarization-entangled photon emitters on a wafer without any post-growth tuning...
May 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28548081/highly-indistinguishable-and-strongly-entangled-photons-from-symmetric-gaas-quantum-dots
#8
Daniel Huber, Marcus Reindl, Yongheng Huo, Huiying Huang, Johannes S Wildmann, Oliver G Schmidt, Armando Rastelli, Rinaldo Trotta
The development of scalable sources of non-classical light is fundamental to unlocking the technological potential of quantum photonics. Semiconductor quantum dots are emerging as near-optimal sources of indistinguishable single photons. However, their performance as sources of entangled-photon pairs are still modest compared to parametric down converters. Photons emitted from conventional Stranski-Krastanov InGaAs quantum dots have shown non-optimal levels of entanglement and indistinguishability. For quantum networks, both criteria must be met simultaneously...
May 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28546059/inflammation-and-attentional-bias-in-breast-cancer-survivors
#9
Chloe C Boyle, Patricia A Ganz, Kathleen M Van Dyk, Julienne E Bower
Evidence suggests an association between inflammation and depression, although findings are mixed. Focusing on core processes in depression may clarify associated biological underpinnings. Negative cognitive bias is a key component of depression, but has not been examined in relation to inflammation. Thus, we tested the hypothesis that elevated inflammatory markers would be associated with negative attentional bias in a sample of 91 breast cancer survivors. Participants were drawn from a larger study and provided blood samples for assessment of peripheral markers of inflammation and completed questionnaires and neuropsychological testing...
May 22, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28545475/urinary-neprilysin-in-the-critically-ill-patient
#10
Sahra Pajenda, Karl Mechtler, Ludwig Wagner
BACKGROUND: Critically ill patients in intensive care face hazardous conditions. Among these, acute kidney injury (AKI) is frequently seen as a result of sepsis. Early diagnosis of kidney injury is of the utmost importance in the guidance of interventions or avoidance of treatment-induced kidney injury. On these grounds, we searched for markers that could indicate proximal tubular cell injury. METHODS: Urine samples of 90 patients admitted to the intensive or intermediate care unit were collected over 2 to 5 days...
May 25, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28545423/determinants-of-tuberculosis-transmission-and-treatment-abandonment-in-fortaleza-brazil
#11
Guy Harling, Antonio S Lima Neto, Geziel S Sousa, Marcia M T Machado, Marcia C Castro
BACKGROUND: Tuberculosis (TB) remains a public health problem, despite recent achievements in reducing incidence and mortality rates. In Brazil, these achievements were above the worldwide average, but marked by large regional heterogeneities. In Fortaleza (5th largest city in Brazil), the tuberculosis cure rate has been declining and treatment abandonment has been increasing in the past decade, despite a reduction in incidence and an increase in directly observed therapy (DOT). These trends put efforts to eliminate tuberculosis at risk...
May 25, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28544892/facial-expression-movement-enhances-the-measurement-of-temporal-dynamics-of-attentional-bias-in-the-dot-probe-task
#12
Corrado Caudek, Francesco Ceccarini, Claudio Sica
The facial dot-probe task is one of the most common experimental paradigms used to assess attentional bias toward emotional information. In recent years, however, the psychometric properties of this paradigm have been questioned. In the present study, attentional bias to emotional face stimuli was measured with dynamic and static images of realistic human faces in 97 college students (63 women) who underwent either a positive or a negative mood-induction prior to the experiment. We controlled the bottom-up salience of the stimuli in order to dissociate the top-down orienting of attention from the effects of the bottom-up physical properties of the stimuli...
May 10, 2017: Behaviour Research and Therapy
https://www.readbyqxmd.com/read/28544657/a-strategy-to-enhance-the-efficiency-of-quantum-dot-sensitized-solar-cells-by-decreasing-the-electron-recombinations-with-polyoxometalate-tio2-as-the-electronic-interface-layer
#13
Li Chen, Wei-Lin Chen, Jian-Ping Li, Jia-Bo Wang, En-Bo Wang
The serious electron recombination occurring in TiO2/quantum dot sensitizer/electrolyte interface is the key reason for hindering the further efficiency improvement of QDSCs. Polyoxometalate(POM) can be as electron transfer media to decreasing electron recombination of photoelectric device, which is due to the excellent oxidation reduction properties and thermostability. So in this paper, POM/TiO2 electronic interface layer prepared by a simple layer-by-layer self-assembly method is added between FTO and mesoporous TiO2 in the photoanode of the QDSCs, and their effects on the photovoltaic performance are systematically investigated...
May 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28544617/defect-laden-mose2-quantum-dots-made-by-turbulent-shear-mixing-as-enhanced-electrocatalysts
#14
Chongyang Zhu, Yuan Huang, Feng Xu, Peng Gao, Binghui Ge, Jing Chen, Haibo Zeng, Eli Sutter, Peter Sutter, Litao Sun
A high density of edge sites and other defects can significantly improve the catalytic activity of layered 2D materials. Herein, this study demonstrates a novel top-down strategy to maximize catalytic edge sites of MoSe2 by breaking up bulk MoSe2 into quantum dots (QDs) via "turbulent shear mixing" (TSM). The ultrasmall size of the MoSe2 QDs provides a high fraction of atoms in reactive edge sites, thus significantly improving the catalytic activities. The violent TSM further introduces abundant defects as additional active sites for electrocatalytic reactions...
May 24, 2017: Small
https://www.readbyqxmd.com/read/28544211/highly-luminescent-and-ultra-stable-cspbbr3-pervoskite-quantum-dots-silica-alumina-monolith
#15
Zhichun Li, Long Kong, Shouqiang Huang, Liang Li
We successfully prepared QDs-silica/alumina monolith (QDs-SAM) by a simple sol-gel reaction of Al-Si single precursors with CsPbBr3 QDs blended in toluene solution, without adding water and catalyst. The resultant transparent monolith exhibits high photoluminescence quantum yields (PLQY) up to 90%, and good photostability under strong illumination of blue light for 300 h. We demonstrated that the preliminary ligand exchange of didodecyl dimethyl ammonium bromide (DDAB) was very important to protect CsPbBr3 QDs from the surface damages during sol-gel reaction, which not only allowed us to maintain the original optical properties of CsPbBr3 QDs but also avoided the aggregation of QDs and make the monolith transparent...
May 24, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28542441/dot-or-sat-for-rifampicin-resistant-tuberculosis-a-non-randomized-comparison-in-a-high-hiv-prevalence-setting
#16
Erika Mohr, Johnny Daniels, Busisiwe Beko, Petros Isaakidis, Vivian Cox, Sarah Jane Steele, Odelia Muller, Leigh Snyman, Virginia De Azevedo, Amir Shroufi, Laura Trivino Duran, Jennifer Hughes
BACKGROUND: Daily directly-observed therapy (DOT) is recommended for rifampicin-resistant tuberculosis (RR-TB) patients throughout treatment. We assessed the impact of self-administered treatment (SAT) in a South African township with high rates of RR-TB and HIV. METHODS: Community-supported SAT for patients who completed the intensive phase was piloted in five primary care clinics in Khayelitsha. We compared final treatment outcomes among RR-TB patients initiating treatment before (standard-of-care (SOC)-cohort, January 2010-July 2013) and after the implementation of the pilot (SAT-cohort, January 2012-December 2014)...
2017: PloS One
https://www.readbyqxmd.com/read/28542431/the-mediating-role-of-rumination-in-the-relation-between-attentional-bias-towards-thin-female-bodies-and-eating-disorder-symptomatology
#17
Laura Dondzilo, Elizabeth Rieger, Romina Palermo, Susan Byrne, Jason Bell
The present study sought to investigate the association between selective attentional processing of body images, rumination, and eating disorder symptoms in young women. Seventy-three undergraduate female students (ages 17-24) completed a modified dot-probe task to assess whether young women showed a differential attentional bias pattern towards thin and non-thin female bodies. Participants also completed self-report measures of eating disorder pathology. It was found that increased reports of dietary restraint and body dissatisfaction were associated with both greater attentional bias towards thin bodies and avoidance of non-thin bodies (as compared to neutral images), although the former relationship was stronger than the latter...
2017: PloS One
https://www.readbyqxmd.com/read/28542090/5-km-time-trial-reliability-of-a-non-motorized-treadmill-and-comparison-of-physiological-and-perceptual-responses-versus-a-motorized-treadmill
#18
Hunter S Waldman, Alex J Heatherly, Ashton F Waddell, Ben M Krings, Eric K O'Neal
This study examined the reproducibility of performance across 3 non-motorized treadmill (NMT) 5-km time trials (TT) and physiological, gait, and perceptual differences of running at 5-km pace for both NMT and motorized treadmills (MT). Ten male runners experienced in road racing that had never run on a NMT completed 3 TT to establish personal best 5-km pace. In a later session, participants ran at this pace for 5 min on the NMT while metabolic, gait, and perceptual measures were recorded and then ran at outdoor 5-km personal best pace on a MT at 1% grade (counter-balanced crossover design)...
May 24, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28541652/polymer-as-an-additive-in-the-emitting-layer-for-high-performance-quantum-dot-light-emitting-diodes
#19
Feng Liang, Yuan Liu, Yun Hu, YingLi Shi, Yuqiang Liu, Zhao-Kui Wang, Xuedong Wang, Baoquan Sun, Liang-Sheng Liao
A facile but effective method is proposed to improve the performance of quantum dot light-emitting diodes (QLEDs) by incorporating a polymer, poly (9-vinlycarbazole) (PVK), as an additive into the CdSe/CdS/ZnS quantum dots (QDs) emitting layer (EML). It is found that the charge balance of the device with the PVK-added EML was greatly improved. In addition, the film morphology of the hole-transporting layer (HTL) which is adjacent to the EML is substantially improved. The surface roughness of the HTL is reduced from 5...
May 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28541250/plasmonic-surface-nanostructuring-of-au-dots-sio2-via-laser-irradiation-induced-dewetting
#20
Ruixuan Yu, Tamaki Shibayama, Junya Ishioka, Xuan Meng, Yanhua Lei, Seiichi Watanabe
The in-situ observation of Au dot formation and the self-assembly dynamics of Au nanoparticles (NPs) was successfully demonstrated via dewetting of Au thin films on SiO<sub>2</sub> glass substrates under nano-second pulsed laser irradiation using a multi-quantum beam high-voltage electron microscope. Moreover, using electron energy-loss spectroscopy (EELS) performed in a scanning transmission electron microscope (STEM), the plasmonic properties of the formed Au/SiO<sub>2</sub> nanostructure were analyzed to demonstrate its validity in advanced optical devices...
May 25, 2017: Nanotechnology
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