keyword
MENU ▼
Read by QxMD icon Read
search

polarize

keyword
https://www.readbyqxmd.com/read/28454483/efficient-carrier-injection-transport-relaxation-and-recombination-associated-with-a-stronger-carrier-localization-and-a-low-polarization-effect-of-nonpolar-m-plane-ingan-gan-light-emitting-diodes
#1
Fann-Wei Yang, Yu-Siang You, Shih-Wei Feng
Based on time-resolved electroluminescence (TREL) measurement, more efficient carrier injection, transport, relaxation, and recombination associated with a stronger carrier localization and a low polarization effect in a nonpolar m-plane InGaN/GaN light emitting diode (m-LED), compared with those in a polar c-LED, are reported. With a higher applied voltage in the c-LED, decreasing response time and rising time improve device performance, but a longer recombination time degrades luminescence efficiency. By using an m-LED with a stronger carrier localization and a low polarization effect, shorter response, rising, and recombination times provide more efficient carrier injection, transport, relaxation, and recombination...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28454399/inhibition-of-lung-cancer-growth-by-hangamdan-b-is-mediated-by-macrophage-activation-to-m1-subtype
#2
Hye-Rin Park, Eun-Ji Lee, Seong-Cheol Moon, Tae-Wook Chung, Keuk-Jun Kim, Hwa-Seung Yoo, Chong-Kwan Cho, Ki-Tae Ha
Re-education of tumor-associated macrophages (TAMs) toward antitumor effectors may be a promising therapeutic strategy for the successful treatment of cancer. HangAmDan-B (HAD-B), a herbal formula, has been used for stimulating immune function and activation of vital energy to cancer patients in traditional Korean Medicine. Previous studies have reported the anti-angiogenic and anti-metastatic effects of HAD-B; however, evidence on the immunomodulatory action of HAD-B was not demonstrated. In the present study, immunocompetent mice were used to demonstrate the suppression of the in vivo growth of allograft Lewis lung carcinoma (LLC) cells, by HAD-B...
April 2017: Oncology Letters
https://www.readbyqxmd.com/read/28454181/demonstration-of-a-highly-efficient-terahertz-flat-lens-employing-tri-layer-metasurfaces
#3
Chun-Chieh Chang, Daniel Headland, Derek Abbott, Withawat Withayachumnankul, Hou-Tong Chen
We demonstrate a terahertz flat lens based on tri-layer metasurfaces allowing for broadband linear polarization conversion, where the phase can be tuned through a full 2π range by tailoring the geometry of the subwavelength resonators. The lens functionality is realized by arranging these resonators to create a parabolic spatial phase profile. The fabricated 124-μm-thick device is characterized by scanning the beam profile and cross section, showing diffraction-limited focusing and ∼68% overall efficiency at the operating frequency of 400 GHz...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28454175/estimation-of-photonic-crystal-fiber-dispersion-by-means-of-supercontinuum-generation
#4
Julius Vengelis, Vygandas Jarutis, Valdas Sirutkaitis
We present a technique for photonic crystal fiber dispersion measurement. We demonstrate that investigating supercontinuum using cross-correlation frequency resolved optical gating (XFROG) technique can be used for quantitatively characterizing dispersion and observing orthogonal polarization modes in polarization maintaining photonic crystal fibers. In addition, an XFROG trace of supercontinuum generated in a polarization maintaining photonic crystal fiber reveals complex behavior of orthogonal polarization modes that is different in normal and anomalous dispersion regions of the photonic crystal fiber...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28454162/three-dimensional-electromagnetic-gaussian-schell-model-sources
#5
Olga Korotkova, Lutful Ahad, Tero Setälä
We introduce three-dimensional (3D) stationary, electromagnetic Gaussian Schell-model (GSM) sources in the space-frequency domain and derive the realizability conditions that the source parameters must obey. In particular, we extend to 3D GSM sources two approaches to the realizability conditions presented previously for beam-like GSM sources. The results are of interest in the analysis and synthesis of tunable non-paraxial, partially coherent, partially polarized light fields.
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28454158/adding-a-spin-to-kerker-s-condition-angular-tuning-of-directional-scattering-with-designed-excitation
#6
Lei Wei, Nandini Bhattacharya, H Paul Urbach
We describe a method to control the directional scattering of a high-index dielectric nanosphere, which utilizes the unique focusing properties of an azimuthally polarized phase vortex and a radially polarized beam to independently excite inside the nanosphere a spinning magnetic dipole and a linearly polarized electric dipole mode normal to the magnetic dipole. We show that by simply adjusting the phase and amplitude of the field on the exit pupil of the optical system, the scattering of the nanosphere can be tuned to any direction within a plane, and the method works over a broad wavelength range...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28454149/radially-and-azimuthally-polarized-nanosecond-yb-doped-fiber-mopa-system-incorporating-temporal-shaping
#7
D Lin, N Baktash, M Berendt, M Beresna, P G Kazansky, W A Clarkson, S U Alam, D J Richardson
We report an Yb-doped fiber master-oscillator power-amplifier (MOPA) system with the capability of selectively generating doughnut-shaped radially and azimuthally polarized beams with user-defined temporal pulse shapes. The desired output polarization was generated with the aid of a nanograting spatially variant half-waveplate (S-waveplate). The latter was used to convert the linearly polarized fundamental (LP<sub>01</sub>) mode output from the preamplification stages to a doughnut-shaped radially polarized beam prior to the power amplifier stage...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28454132/broadband-single-mode-single-polarization-passive-fully-aperiodic-large-pitch-fibers
#8
Rémi du Jeu, Romain Dauliat, Dia Darwich, Aurélien Benoit, Raphaël Jamier, Kay Schuster, Philippe Roy
Two evolutions of fully aperiodic large-pitch fiber designs employing few stress-applying parts are presented. The induced elasto-optic stress discriminates the two orthogonal polarization modes (LP<sub>01x</sub> and LP<sub>01y</sub>) of the fundamental mode, selectively delocalizing one of them into the cladding via a suitable coupling to one or several cladding modes. This ensures the propagation of a single linear polarization mode. For the largest core dimensions, however, the applied stress can strongly influence the intensity distributions of core modes, and a tailored design process must thwart this...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28454131/uni-directional-wavelength-conversion-in-silicon-using-four-wave-mixing-driven-by-cross-polarized-pumps
#9
Bryn A Bell, Chunle Xiong, David Marpaung, Colin J McKinstrie, Benjamin J Eggleton
We demonstrate optical frequency conversion between telecom wavelengths using four-wave mixing Bragg scattering powered by two pump pulses polarized on orthogonal axes of a silicon waveguide. This allows conversion in a single frequency direction while, with co-polarized pumps, the signal is redshifted or blueshifted with similar efficiency. Our approach exploits the birefringence of the waveguide and its effect on the phase matching of the four-wave mixing process. The blue or red direction can be selected by the input polarization of the signal, and 20 dB extinction ratios are observed with the unintended direction...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28454125/polarization-dependent-intermodal-four-wave-mixing-in-a-birefringent-multimode-photonic-crystal-fiber
#10
Jinhui Yuan, Zhe Kang, Feng Li, Guiyao Zhou, Xinzhu Sang, Qiang Wu, Binbin Yan, Xian Zhou, Kangping Zhong, Liang Wang, Kuiru Wang, Chongxiu Yu, Chao Lu, Hwa Yaw Tam, P K A Wai
In this Letter, polarization-dependent intermodal four-wave mixing (FWM) is demonstrated experimentally in a birefringent multimode photonic crystal fiber (BM-PCF) designed and fabricated in-house. Femtosecond pump pulses at wavelengths ∼800  nm polarized along one of the principal axes of the BM-PCF are coupled into a normal dispersion region away from the zero-dispersion wavelengths of the fundamental guided mode of the BM-PCF. Anti-Stokes and Stokes waves are generated in the 2nd guided mode at visible and near-infrared wavelengths, respectively...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28454073/low-temperature-raman-spectra-of-the-2-%C3%AE-methylbenzylamino-5-nitropyridine-crystal
#11
G S Pinheiro, M N G Ferreira Júnior, A O Dos Santos, P T C Freire, J A Lima, C E S Nogueira, L P Cardoso, J N Sherwood, C M R Remédios
The polar organic 2-(α-methylbenzylamino)-5-nitropyridine crystal (MBANP) has been studied by Raman spectroscopy at low temperatures (from 300 to 10K). The effect of temperature change on the vibrational spectrum is discussed with the aid of DFT calculations. The behavior of the Raman spectra indicates that MBANP molecules present a different conformation at low temperatures associated with the rotation of the phenyl and pyridine rings. Temperature-dependent X-ray measurements and differential scanning calorimetry (DSC) analysis were utilized as complementary techniques to investigate the structural stability of MBANP crystal...
April 20, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28454063/interaction-of-amino-acid-functionalized-silver-nanoparticles-and-candida-albicans-polymorphs-a-deep-uv-fluorescence-imaging-study
#12
Radovan Dojčilović, Jelena D Pajović, Dušan K Božanić, Una Bogdanović, Vesna V Vodnik, Suzana Dimitrijević-Branković, Miona G Miljković, Slavka Kaščaková, Matthieu Réfrégiers, Vladimir Djoković
The interaction of the tryptophan functionalized Ag nanoparticles and live Candida albicans cells was studied by synchrotron excitation deep-ultraviolet (DUV) fluorescence imaging at the DISCO beamline of Synchrotron SOLEIL. DUV imaging showed that incubation of the fungus with functionalized nanoparticles results in significant increase in the fluorescence signal. The analysis of the images revealed that the interaction of the nanoparticles with (pseudo)hyphae polymorphs of the diploid fungus was less pronounced than in the case of yeast cells or budding spores...
April 23, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28454021/reactive-mineral-removal-relative-to-soil-organic-matter-heterogeneity-and-implications-for-organic-contaminant-sorption
#13
Fangfang Li, Bo Pan, Ni Liang, Zhaofeng Chang, Yuwei Zhou, Lin Wang, Hao Li, Baoshan Xing
Soil organic matter (SOM) is generally treated as a static compartment of soil in pollutant fate studies. However, SOM might be altered or fractionated in soil systems, and the details of SOM property/composition changes when coupled with contaminant behavior are unknown. In this study, a mild acid treatment was adopted to remove reactive minerals and partially remove SOM components. After acid treatment, biomarker signatures showed that lignin-derived phenols were released and black carbon (as suggested by benzene-polycarboxylic acids) and lipids were enriched...
April 25, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28454001/bacterial-community-shift-and-improved-performance-induced-by-in-situ-preparing-dual-graphene-modified-bioelectrode-in-microbial-fuel-cell
#14
Junfeng Chen, Yongyou Hu, Lihua Zhang, Wantang Huang, Jian Sun
Dual graphene modified bioelectrode (D-GM-BE) was prepared by in situ microbial-induced reduction of graphene oxide (GO) and polarity reversion in microbial fuel cell (MFC). Next Generation Sequencing technology was used to elucidate bacterial community shift in response to improved performance in D-GM-BE MFC. The results indicated an increase in the relative ratio of Proteobacteria, but a decrease of Firmicutes was observed in graphene modified bioanode (GM-BA); increase of Proteobacteria and Firmicutes were observed in graphene modified biocathode (GM-BC)...
April 17, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28453941/probing-molecular-interactions-between-human-carbonic-anhydrases-hcas-and-a-novel-class-of-benzenesulfonamides
#15
Elvira Bruno, Maria Rosa Buemi, Anna Di Fiore, Laura De Luca, Stefania Ferro, Andrea Angeli, Roberto Cirilli, Daniele Sadutto, Vincenzo Alterio, Simona Maria Monti, Claudiu T Supuran, Giuseppina De Simone, Rosaria Gitto
On the basis of X-ray crystallographic studies of the complex of hCA II with 4-(3,4-dihydro-1H-isoquinoline-2-carbonyl)benzenesulfonamide (3) (PDB code 4Z1J), a novel series of 4-(1-aryl-3,4-dihydro-1H-isoquinolin-2-carbonyl)benzenesulfonamides (23-33) was designed. Specifically, our idea was to improve the selectivity toward druggable isoforms through the introduction of additional hydrophobic/hydrophilic functionalities. Among the synthesized and tested compounds, the (R,S)-4-(6,7-dihydroxy-1-phenyl-3,4-tetrahydroisoquinoline-1H-2-carbonyl)benzenesulfonamide (30) exhibited a remarkable inhibition for the brain-expressed hCA VII (Ki = 0...
April 28, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28453939/all-atom-molecular-dynamics-simulations-of-peptide-amphiphile-assemblies-that-spontaneously-form-twisted-and-helical-ribbon-structures
#16
Cheng-Tsung Lai, Nathaniel L Rosi, George C Schatz
Self-assembly of peptide amphiphiles (PAs) has been an active research area as the assemblies can be programmed into various shaped nanostructures. Although cylindrical micelles are common structures, gold-binding peptide conjugates PEPAu can self-assemble into chiral nanofibers with single or double helices. When gold nanoparticles bind to the helices, the resulting chiral nanoparticle assemblies have a collective plasmonic circular dichroism signal that can serve as nanoscale circular polarizers or chiroptical sensors...
April 28, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28453937/impact-of-dielectric-constant-on-the-singlet-triplet-gap-in-thermally-activated-delayed-fluorescence-tadf-materials
#17
Haitao Sun, Zhubin Hu, Cheng Zhong, XianKai Chen, Zhenrong Sun, Jean-Luc Bredas
Thermally activated delayed fluorescence (TADF) relies on the presence of a very small energy gap, ΔEST, between the lowest singlet and triplet excited states. ΔEST is thus a key factor in the molecular design of more efficient materials. However, its accurate theoretical estimation remains challenging, especially in the solid state due to the influence of polarization effects. In this Letter, we have quantitatively studied ΔEST as a function of dielectric constant, ε, for four representative organic molecules using the methodology we recently proposed at the Tamm-Dancoff Approximation ωB97X level of theory, where the range-separation parameter ω is optimized with the polarizable continuum model (PCM)...
April 28, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28453746/activation-of-cecr1-in-m2-like-tams-promotes-paracrine-stimulation-mediated-glial-tumor-progression
#18
Changbin Zhu, Dana Mustafa, Ping-Pin Zheng, Marcel van der Weiden, Andrea Sacchetti, Maarten Brandt, Ihsan Chrifi, Dennie Tempel, Pieter J M Leenen, Dirk Jan Duncker, Caroline Cheng, Johan M Kros
Background.: The majority of glioma-associated microglia/macrophages have been identified as M2-type macrophages with immune suppressive and tumor supportive action. Recently, the extracellular adenosine deaminase protein Cat Eye Syndrome Critical Region Protein 1 (CECR1) was shown to regulate macrophage maturation. In this study, we investigate the role of CECR1 in the regulation of the glioma-associated macrophage response. Methods.: Expression of CECR1 was assessed in human glioma samples...
May 1, 2017: Neuro-oncology
https://www.readbyqxmd.com/read/28453662/mglur5-tunes-ngf-trka-signaling-to-orient-spiny-stellate-neuron-dendrites-toward-thalamocortical-axons-during-whisker-barrel-map-formation
#19
Jui-Yen Huang, Hui-Chen Lu
Neurons receive and integrate synaptic inputs at their dendrites, thus dendritic patterning shapes neural connectivity and behavior. Aberrant dendritogenesis is present in neurodevelopmental disorders such as Down's syndrome and autism. Abnormal glutamatergic signaling has been observed in these diseases, as has dysfunction of the metabotropic glutamate receptor 5 (mGluR5). Deleting mGluR5 in cortical glutamatergic neurons disrupted their coordinated dendritic outgrowth toward thalamocortical axons and perturbed somatosensory circuits...
April 27, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28453661/photoreceptor-outer-segment-as-a-sink-for-membrane-proteins-hypothesis-and-implications-in-retinal-ciliopathies
#20
Seongjin Seo, Poppy Datta
The photoreceptor outer segment (OS) is a unique modification of the primary cilium, specialized for light perception. Being homologous organelles, the primary cilium and the OS share common building blocks and molecular machinery to construct and maintain them. The OS, however, has several unique structural features that are not seen in primary cilia. Although these unique features of the OS have been well documented, their implications in protein localization have been under-appreciated. In this review, we compare the structural properties of the primary cilium and the OS, and propose a hypothesis that the OS can act as a sink for membrane proteins...
April 26, 2017: Human Molecular Genetics
keyword
keyword
87495
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"