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https://www.readbyqxmd.com/read/28335295/investigation-of-the-band-structure-of-graphene-based-plasmonic-photonic-crystals
#1
Pingping Qiu, Weibin Qiu, Zhili Lin, Houbo Chen, Yixin Tang, Jia-Xian Wang, Qiang Kan, Jiao-Qing Pan
In this paper, one-dimensional (1D) and two-dimensional (2D) graphene-based plasmonic photonic crystals (PhCs) are proposed. The band structures and density of states (DOS) have been numerically investigated. Photonic band gaps (PBGs) are found in both 1D and 2D PhCs. Meanwhile, graphene-based plasmonic PhC nanocavity with resonant frequency around 175 THz, is realized by introducing point defect, where the chemical potential is from 0.085 to 0.25 eV, in a 2D PhC. Also, the bending wvaguide and the beam splitter are realized by introducing the line defect into the 2D PhC...
September 9, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335230/fluorescent-nanocomposite-of-embedded-ceria-nanoparticles-in-crosslinked-pva-electrospun-nanofibers
#2
Nader Shehata, Soha Gaballah, Effat Samir, Aya Hamed, Marwa Saad
This paper introduces a new fluorescent nanocomposite of electrospun biodegradable nanofibers embedded with optical nanoparticles. In detail, this work introduces the fluorescence properties of PVA nanofibers generated by the electrospinning technique with embedded cerium oxide (ceria) nanoparticles. Under near-ultra violet excitation, the synthesized nanocomposite generates a visible fluorescent emission at 520 nm, varying its intensity peak according to the concentration of in situ embedded ceria nanoparticles...
June 1, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334526/an-unusual-non-emissive-behavior-of-rubrene-j-aggregates-a-rare-violation
#3
Nikhil Aggarwal, Archita Patnaik
Structure - property correlations in Rubrene (RB) colloidal J-aggregates were unravelled by steady state and time resolved spectroscopy in conjunction with excited state density functional calculations. The RB J-aggregate with a slippage angle θ = 30.4(0), estimated from the monomeric transition dipole moment directions, exhibited a broad FWHM of 1073 cm(-1) and a 5 nm red shifted absorption band carrying a transition dipole moment (M ⃗_(λagg )= 1.80 D) almost equivalent to the monomeric dye (M ⃗_(λmon )=1...
March 23, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28333993/integrated-transcriptomic-and-proteomic-analysis-of-the-molecular-cargo-of-extracellular-vesicles-derived-from-porcine-adipose-tissue-derived-mesenchymal-stem-cells
#4
Alfonso Eirin, Xiang-Yang Zhu, Amrutesh S Puranik, John R Woollard, Hui Tang, Surendra Dasari, Amir Lerman, Andre J van Wijnen, Lilach O Lerman
BACKGROUND: Mesenchymal stromal/stem cell (MSC) transplantation is a promising therapy for tissue regeneration. Extracellular vesicles (EVs) released by MSCs act as their paracrine effectors by delivering proteins and genetic material to recipient cells. To assess how their cargo mediates biological processes that drive their therapeutic effects, we integrated miRNA, mRNA, and protein expression data of EVs from porcine adipose tissue-derived MSCs. METHODS: Simultaneous expression profiles of miRNAs, mRNAs, and proteins were obtained by high-throughput sequencing and LC-MS/MS proteomic analysis in porcine MSCs and their daughter EVs (n = 3 each)...
2017: PloS One
https://www.readbyqxmd.com/read/28332812/hierarchical-nico2s4-nife-ldh-heterostructures-supported-on-nickel-foam-for-enhanced-overall-water-splitting-activity
#5
Jia Liu, Jinsong Wang, Bao Zhang, Yunjun Ruan, Lin Lv, Xiao Ji, Kui Xu, Ling Miao, Jianjun Jiang
Low cost and high efficient bifunctional electrocatalysts for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) are intensively investigated for overall water splitting. Herein, we combined experimental researches with first-principles calculations based on density functional theory (DFT) to engineer the NiCo2S4@NiFe LDH heterostructures interface for enhancing overall water splitting activity. The DFT calculations exhibit a strong interaction and charge transfer between NiCo2S4 and NiFe LDH, which change the interfacial electronic structure and surface reactivity...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28332485/tuning-ferritin-s-band-gap-through-mixed-metal-oxide-nanoparticle-formation
#6
Cameron Olsen, Jacob Embley, Kameron Hansen, Andrew Henrichsen, J Peterson, John S Colton, Richard Watt
This study uses the formation of a mixed metal oxide inside ferritin to tune the band gap energy of the ferritin mineral. The mixed metal oxide is composed of both Co and Mn, and is formed by reacting aqueous Co2+ with MnO4- in the presence of apoferritin. Altering the ratio between the two reactants allowed for controlled tuning of the band gap energies. All minerals formed were indirect band gap materials, with indirect band gap energies ranging from 0.52 to 1.30 eV. The direct transitions were also measured, with energy values ranging from 2...
March 23, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28332483/permanganate-based-synthesis-of-manganese-oxide-nanoparticles-in-ferritin
#7
Cameron Olsen, Trevor Smith, Jacob Embley, Jake Maxfield, Kameron Hansen, J Peterson, Andrew Henrichsen, Stephen Erickson, David Buck, John S Colton, Richard Watt
This paper investigates the comproportionation reaction of MnII with MnO4- as a route for manganese oxide nanoparticle synthesis in the protein ferritin. We report that MnO4- serves as the electron acceptor and reacts with MnII in the presence of apoferritin to form manganese oxide cores inside the protein shell. Manganese loading into ferritin was studied under acidic, neutral, and basic conditions and the ratios of MnII and permanganate were varied at each pH. The manganese-containing ferritin samples were characterized by transmission electron microscopy, UV/Vis absorption, and by measuring the band gap energies for each sample...
March 23, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28331957/digital-triplex-dna-assay-based-on-plasmonic-nanocrystals
#8
Guohua Li, Liang Zhu, Yonghong He, Hui Tan, Shuqing Sun
A new analytical method has been developed to detect three kinds of DNA simultaneously based on magnetic beads and color-encoded plasmonic nanocrystals. Magnetic beads modified with capture DNA are employed to collect the specific target DNA, and color-encoded plasmonic nanocrystals are applied to signal the target through DNA hybridization. As a proof of concept, three types of representative metal nanocrystals of gold nanoparticle (AuNP), gold nanorod (AuNR), and gold/silver nanoparticle (Au/AgNP) were employed to signal three dissimilar virus-related protective antigen genes, Ebola virus (EV), Variola virus (VV), and Bacillus anthracis (BA), respectively...
March 22, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28331092/monkeypox-virus-host-factor-screen-in-haploid-cells-identifies-essential-role-of-garp-complex-in-extracellular-virus-formation
#9
Susan Realegeno, Andreas S Puschnik, Amrita Kumar, Cynthia Goldsmith, Jillybeth Burgado, Suryaprakash Sambhara, Victoria A Olson, Darin Carroll, Inger Damon, Tetsuya Hirata, Taroh Kinoshita, Jan E Carette, Panayampalli Subbian Satheshkumar
Monkeypox virus (MPXV) is a human pathogen that is a member of the Orthopoxvirus genus, which includes Vaccinia virus and Variola virus (the causative agent of smallpox). Human monkeypox is considered an emerging zoonotic infectious disease. To identify host factors required for MPXV infection, we performed a genome-wide insertional mutagenesis screen in human haploid cells. The screen revealed several candidate genes, including those involved in Golgi trafficking, glycosaminoglycan biosynthesis and glycosylphosphatidylinositol (GPI) - anchor biosynthesis...
March 22, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28330354/scanning-tunneling-microscopy-study-of-thin-ptcdi-films-on-ag-si-111-%C3%A2-3-%C3%A3-%C3%A2-3
#10
C Emanuelsson, H M Zhang, E Moons, L S O Johansson
3,4,9,10-perylene tetracarboxylic diimide molecules were evaporated onto a Ag/Si(111)-√3 × √3 surface and studied by scanning tunneling microscopy/spectroscopy and low energy electron diffraction (LEED). The growth mode was characterized as layer-by-layer growth with a single molecular unit cell in a short range order. The growth of the first two monolayers involves a molecule/substrate superstructure and a molecule/molecule superstructure. At higher coverages, the molecules in each layer were found to align so that unit cells are on top of each other...
March 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28327734/band-edge-oscillator-strength-of-colloidal-cdse-cds-dot-in-rods-comparison-of-absorption-and-time-resolved-fluorescence-spectroscopy
#11
I Angeloni, W Raja, A Polovitsyn, F De Donato, R Proietti Zaccaria, I Moreels
We studied the oscillator strength fgap of the band gap transition in heteronanocrystals (hNCs) with a spherical CdSe core embedded in an elongated CdS shell. A comparison with fgap of core-only CdSe NCs confirmed a reduction of the electron-hole overlap in hNCs with a band gap larger than 2.05 eV or smaller than 1.98 eV. However, the decrease in fgap is limited to about 50% when compared to CdSe NCs, suggesting that residual confinement still localizes the electron near the core. We correlated fgap with the radiative lifetime obtained from multiexponential photoluminescence (PL) decay traces...
March 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28326462/study-of-electron-ionization-and-fragmentation-of-non-hydrated-and-hydrated-tetrahydrofuran-clusters
#12
Michael Neustetter, Masoomeh Mahmoodi-Darian, Stephan Denifl
Mass spectroscopic investigations on tetrahydrofuran (THF, C4H8O), a common model molecule of the DNA-backbone, have been carried out. We irradiated isolated THF and (hydrated) THF clusters with low energy electrons (electron energy ~70 eV) in order to study electron ionization and ionic fragmentation. For elucidation of fragmentation pathways, deuterated TDF (C4D8O) was investigated as well. One major observation is that the cluster environment shows overall a protective behavior on THF. However, also new fragmentation channels open in the cluster...
March 21, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28326171/large-scale-isolation-and-cytotoxicity-of-extracellular-vesicles-derived-from-activated-human-natural-killer-cells
#13
Ambrose Y Jong, Chun-Hua Wu, Jingbo Li, Jianping Sun, Muller Fabbri, Alan S Wayne, Robert C Seeger
Extracellular vesicles (EVs) have been the focus of great interest, as they appear to be involved in numerous important cellular processes. They deliver bioactive macromolecules such as proteins, lipids, and nucleic acids, allowing intercellular communication in multicellular organisms. EVs are secreted by all cell types, including immune cells such as natural killer cells (NK), and they may play important roles in the immune system. Currently, a large-scale procedure to obtain functional NK EVs is lacking, limiting their use clinically...
2017: Journal of Extracellular Vesicles
https://www.readbyqxmd.com/read/28326170/obstacles-and-opportunities-in-the-functional-analysis-of-extracellular-vesicle-rna-an-isev-position-paper
#14
Bogdan Mateescu, Emma J K Kowal, Bas W M van Balkom, Sabine Bartel, Suvendra N Bhattacharyya, Edit I Buzás, Amy H Buck, Paola de Candia, Franklin W N Chow, Saumya Das, Tom A P Driedonks, Lola Fernández-Messina, Franziska Haderk, Andrew F Hill, Jennifer C Jones, Kendall R Van Keuren-Jensen, Charles P Lai, Cecilia Lässer, Italia di Liegro, Taral R Lunavat, Magdalena J Lorenowicz, Sybren L N Maas, Imre Mäger, Maria Mittelbrunn, Stefan Momma, Kamalika Mukherjee, Muhammed Nawaz, D Michiel Pegtel, Michael W Pfaffl, Raymond M Schiffelers, Hidetoshi Tahara, Clotilde Théry, Juan Pablo Tosar, Marca H M Wauben, Kenneth W Witwer, Esther N M Nolte-'t Hoen
The release of RNA-containing extracellular vesicles (EV) into the extracellular milieu has been demonstrated in a multitude of different in vitro cell systems and in a variety of body fluids. RNA-containing EV are in the limelight for their capacity to communicate genetically encoded messages to other cells, their suitability as candidate biomarkers for diseases, and their use as therapeutic agents. Although EV-RNA has attracted enormous interest from basic researchers, clinicians, and industry, we currently have limited knowledge on which mechanisms drive and regulate RNA incorporation into EV and on how RNA-encoded messages affect signalling processes in EV-targeted cells...
2017: Journal of Extracellular Vesicles
https://www.readbyqxmd.com/read/28326169/circulating-ll37-targets-plasma-extracellular-vesicles-to-immune-cells-and-intensifies-beh%C3%A3-et-s-disease-severity
#15
Tamer Kahraman, Gozde Gucluler, Ismail Simsek, Fuat Cem Yagci, Muzaffer Yildirim, Can Ozen, Ayhan Dinc, Mayda Gursel, Lolai Ikromzoda, Tolga Sutlu, Stephen Gay, Ihsan Gursel
Behçet's disease (BD) activity is characterised by sustained, over-exuberant immune activation, yet the underlying mechanisms leading to active BD state are poorly defined. Herein, we show that the human cathelicidin derived antimicrobial peptide LL37 associates with and directs plasma extracellular vesicles (EV) to immune cells, thereby leading to enhanced immune activation aggravating BD pathology. Notably, disease activity was correlated with elevated levels of circulating LL37 and EV plasma concentration...
2017: Journal of Extracellular Vesicles
https://www.readbyqxmd.com/read/28326168/ribonucleic-artefacts-are-some-extracellular-rna-discoveries-driven-by-cell-culture-medium-components
#16
REVIEW
Juan Pablo Tosar, Alfonso Cayota, Erez Eitan, Marc K Halushka, Kenneth W Witwer
In a recently published study, Anna Krichevsky and colleagues raise the important question of whether results of in vitro extracellular RNA (exRNA) studies, including extracellular vesicle (EV) investigations, are confounded by the presence of RNA in cell culture medium components such as foetal bovine serum (FBS). The answer, according to their data, is a resounding "yes". Even after lengthy ultracentrifugation to remove bovine EVs from FBS, the majority of exRNA in FBS remained. Although technical factors may affect the degree of depletion, residual EVs and exRNA in FBS could influence the conclusions of in vitro studies: certainly, for secreted RNA, and possibly also for cell-associated RNA...
2017: Journal of Extracellular Vesicles
https://www.readbyqxmd.com/read/28326166/trail-delivery-by-msc-derived-extracellular-vesicles-is-an-effective-anticancer-therapy
#17
ZhengQiang Yuan, Krishna K Kolluri, Kate H C Gowers, Sam M Janes
Extracellular vesicles (EVs) are lipid membrane-enclosed nanoparticles released by cells. They mediate intercellular communication by transferring biological molecules and therefore have potential as innovative drug delivery vehicles. TNF-related apoptosis-inducing ligand (TRAIL) selectively induces apoptosis of cancer cells. Unfortunately, the clinical application of recombinant rTRAIL has been hampered by its low bioavailability and resistance of cancer cells. EV-mediated TRAIL delivery may circumvent these problems...
2017: Journal of Extracellular Vesicles
https://www.readbyqxmd.com/read/28324860/direct-detection-of-two-different-tumor-derived-extracellular-vesicles-by-sam-aunis-lspr-biosensor
#18
Abhimanyu Thakur, Guangyu Qiu, Siu-Pang Ng, Jintao Guan, Jianbo Yue, Youngjin Lee, Chi-Man Lawrence Wu
Extracellular vesicles (EVs) are abundant in various biological fluids including blood, saliva, urine, as well as extracellular milieu. Accumulating evidence has indicated that EVs, which contain functional proteins and small RNAs, facilitate intercellular communication between neighbouring cells, and are critical to maintain various physiological processes. In contrast, EV-derived toxic signals can spread out over the tissues adjacent to the injured area in certain diseases, including brain tumors and neurodegenerative disorders...
March 18, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28323352/efficient-semitransparent-solar-cells-with-high-nir-responsiveness-enabled-by-a-small-bandgap-electron-acceptor
#19
Feng Liu, Zichun Zhou, Cheng Zhang, Jianyun Zhang, Qin Hu, Thomas Vergote, Feng Liu, Thomas P Russell, Xiaozhang Zhu
Inspired by the remarkable promotion of power conversion efficiency (PCE), commercial applications of organic photovoltaics (OPVs) can be foreseen in near future. One of the most promising applications is semitransparent (ST) solar cells that can be utilized in value-added applications such as energy-harvesting windows. However, the single-junction STOPVs utilizing fullerene acceptors show relatively low PCEs of 4%-6% due to the limited sunlight absorption because it is a dilemma that more photons need to be harvested in UV-vis-near-infrared (NIR) region to generate high photocurrent, which leads to the significant reduction of device transparency...
March 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28322554/schottky-barriers-in-bilayer-phosphorene-transistors
#20
Yuanyuan Pan, Yang Dan, Yangyang Wang, Meng Ye, Han Zhang, Ruge Quhe, Xiuying Zhang, Jingzhen Li, Wanlin Guo, Li Yang, Jing Lu
It is unreliable to evaluate the Schottky barrier height (SBH) in monolayer (ML) 2D material field effect transistors (FETs) with strongly interacted electrode from the work function approximation (WFA) because of existence of the Fermi-level pinning. Here, we report the first systematical study of bilayer (BL) phosphorene FETs in contact with a series of metals with a wide work function range ( Al, Ag, Cu, Au, Cr, Ti, Ni, and Pd) by using both ab initio electronic band calculations and quantum transport simulation (QTS)...
March 21, 2017: ACS Applied Materials & Interfaces
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