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https://www.readbyqxmd.com/read/27935132/layered-mos2-and-carbon-nanotube-core-shell-structured-nanocomposites-for-enhanced-nonlinear-optical-performances
#1
Xiaoyan Zhang, Andrew Selkirk, Saifeng Zhang, Jiawei Huang, Yuanxin Li, Yafeng Xie, Ningning Dong, Yun Cui, Long Zhang, Werner J Blau, Jun Wang
Nanocomposites of layered MoS2 and multi-walled carbon nanotubes (CNTs) with core-shell structure were prepared via a simple solvothermal method. The formation of MoS2 nanosheets on the surface of coaxial CNTs has been confirmed by scanning electron microscopy, transmission electron microscopy, absorption spectrum, Raman spectroscopy, and X-ray photoelectron spectroscopy. Enhanced third-order nonlinear optical performances were observed for both femtosecond and nanosecond laser pulses over a broad wavelength range from the visible to the near infrared, in compared to those of MoS2 and CNTs alone...
December 9, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27934325/ab-initio-study-of-ionized-water-radical-cation-h2o-8-in-combination-with-the-particle-swarm-optimization-method
#2
Mei Tang, Cui-E Hu, Zhen-Long Lv, Xiang-Rong Chen, Ling-Cang Cai
The structures of cationic water clusters (H2O)8(+) have been globally explored by the particle swarm optimization method in combination with quantum chemical calculations. Geometry optimization and vibrational analysis for the 15 most interesting clusters were computed at the MP2/aug-cc-pVDZ level and infrared spectrum calculation at MPW1K/6-311++G** level. Special attention was paid to the relationships between their configurations and energies. Both MP2 and B3LYP-D3 calculations revealed that the cage-like structure is the most stable, which is different from a five-membered ring lowest energy structure but agrees well with a cage-like structure in the literature...
December 1, 2016: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/27934184/two-dimensional-sio2-vo2-photonic-crystals-with-statically-visible-and-dynamically-infrared-modulated-for-smart-window-deployment
#3
Yujie Ke, Igal Balin, Ning Wang, Qi Lu, Alfred Iing Yoong Tok, Timothy J White, Shlomo Magdassi, Ibrahim Abdulhalim, Yi Long
Two-dimensional (2D) photonic structures, widely used for generating photonic band gaps (PBG) in a variety of materials, are for the first time integrated with the temperature-dependent phase change of vanadium dioxide (VO2). VO2 possesses thermochromic properties, whose potential remains unrealized due to an undesirable yellow-brown color. Here, a SiO2/VO2 core/shell 2D photonic crystal is demonstrated to exhibit static visible light tunability and dynamic near-infrared (NIR) modulation. Three-dimensional (3D) finite difference time domain (FDTD) simulations predict that the transmittance can be tuned across the visible spectrum, while maintaining good solar regulation efficiency (ΔTsol = 11...
December 7, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27934074/cancer-cell-membrane-biomimetic-nanoparticles-for-homologous-targeting-dual-modal-imaging-and-photothermal-therapy
#4
Ze Chen, Pengfei Zhao, Zhenyu Luo, Mingbin Zheng, Hao Tian, Ping Gong, Guanhui Gao, Hong Pan, Lanlan Liu, Aiqing Ma, Haodong Cui, Yifan Ma, Lintao Cai
An active cell membrane-camouflaged nanoparticle, owning to membrane antigens and membrane structure, can achieve special properties such as specific recognition, long blood circulation, and immune escaping. Herein, we reported a cancer cell membrane-cloaked nanoparticle system as a theranostic nanoplatform. The biomimetic nanoparticles (indocyanine green (ICG)-loaded and cancer cell membrane-coated nanoparticles, ICNPs) exhibit a core-shell nanostructure consisting of an ICG-polymeric core and cancer cell membrane shell...
November 22, 2016: ACS Nano
https://www.readbyqxmd.com/read/27930993/use-of-ftir-spectroscopy-and-pca-ldc-analysis-to-identify-cancerous-lesions-within-the-human-colon
#5
E Kaznowska, J Depciuch, K Szmuc, J Cebulski
Colorectal cancer constitutes 33% of all cancer morbidity, so the research of the new methods for colorectal cancer diagnosis and chemotherapy monitoring is gaining its momentum. Diagnostic instruments are being sought, which enable the detection of single malignant cells based on the analysis of tissue material potentially reusable at further stages of diagnostic management. The most common approach to tissue specimen processing is paraffin-embedding. Yet, paraffin may cause background noise in spectroscopic measurements with the wavenumber ranging between 900cm(-1) and 3500cm(-1)...
November 30, 2016: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/27928781/mechanism-of-fluorescence-enhancement-of-biosynthesized-xfe2o4-bifeo3-x-cr-mn-co-or-ni-membranes
#6
Liang Bian, Hai-Long Li, Hai-Liang Dong, Fa-Qin Dong, Mian-Xin Song, Li-Sheng Wang, Wen-Ping Hou, Lei Gao, Xiao-Yan Zhang, Tian-Liang Zhou, Guang-Ai Sun, Xin-Xi Li, Lei Xie
Ferrites-bismuth ferrite is an intriguing option for medical diagnostic imaging device due to its magnetoelectric and enhanced near-infrared fluorescent properties. However, the embedded XFO nanoparticles are randomly located on the BFO membranes, making implementation in devices difficult. To overcome this, we present a facile bio-approach to produce XFe2O4-BiFeO3 (XFO-BFO) (X = Cr, Mn, Co, or Ni) membranes using Shewanella oneidensis MR-1. The perovskite BFO enhances the fluorescence intensity (at 660 and 832 nm) and surface potential difference (-469 ~ 385 meV and -80 ~ 525 meV) of the embedded spinel XFO...
December 2016: Nanoscale Research Letters
https://www.readbyqxmd.com/read/27924162/a-pretargeted-approach-for-the-multimodal-pet-nirf-imaging-of-colorectal-cancer
#7
Pierre Adumeau, Kathryn E Carnazza, Christian Brand, Sean D Carlin, Thomas Reiner, Brian J Agnew, Jason S Lewis, Brian M Zeglis
The complementary nature of positron emission tomography (PET) and near-infrared fluorescence (NIRF) imaging makes the development of strategies for the multimodal PET/NIRF imaging of cancer a very enticing prospect. Indeed, in the context of colorectal cancer, a single multimodal PET/NIRF imaging agent could be used to stage the disease, identify candidates for surgical intervention, and facilitate the image-guided resection of the disease. While antibodies have proven to be highly effective vectors for the delivery of radioisotopes and fluorophores to malignant tissues, the use of radioimmunoconjugates labeled with long-lived nuclides such as (89)Zr poses two important clinical complications: high radiation doses to the patient and the need for significant lag time between imaging and surgery...
2016: Theranostics
https://www.readbyqxmd.com/read/27918633/robust-colloidal-nanoparticles-of-pyrrolopyrrole-cyanines-j-aggregates-with-bright-near-infrared-fluorescence-in-aqueous-media-from-spectral-tailoring-to-bioimaging-application
#8
Cangjie Yang, Xiaochen Wang, Mingfeng Wang, Keming Xu, Chenjie Xu
We report a new class of colloidal nanoparticles called JAGG containing near-infrared fluorescent J-aggregates of pyrrolopyrrole cyanines (PPcys) stabilized by amphiphilic block copolymers in aqueous media. The formation of such JAGG can be tuned by the chemical structure of PPcys, the concentration of the chromophores inside the polymeric nanoparticles and ultrasonic treatment. These JAGG nanoparticles exhibit a narrow emission band at 773 nm, a fluorescence quantum yield comparable to that of indocyanine green, and significantly enhanced photostability that is ideal for long-term bioimaging...
December 5, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27916910/excited-state-dynamics-of-melamine-and-its-lysine-derivative-investigated-by-femtosecond-transient-absorption-spectroscopy
#9
Yuyuan Zhang, Ashley A Beckstead, Yuesong Hu, Xijun Piao, Dennis Bong, Bern Kohler
Melamine may have been an important prebiotic information carrier, but its excited-state dynamics, which determine its stability under UV radiation, have never been characterized. The ability of melamine to withstand the strong UV radiation present on the surface of the early Earth is likely to have affected its abundance in the primordial soup. Here, we studied the excited-state dynamics of melamine (a proto-nucleobase) and its lysine derivative (a proto-nucleoside) using the transient absorption technique with a UV pump, and UV and infrared probe pulses...
November 30, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27910346/initial-measurements-of-plasma-current-and-electron-density-profiles-using-a-polarimeter-interferometer-point-for-long-pulse-operation-in-east-invited
#10
H Q Liu, J P Qian, Y X Jie, W X Ding, D L Brower, Z Y Zou, W M Li, H Lian, S X Wang, Y Yang, L Zeng, T Lan, Y Yao, L Q Hu, X D Zhang, B N Wan
A double-pass, radially viewing, far-infrared laser-based POlarimeter-INTerferometer (POINT) system utilizing the three-wave technique has been implemented for diagnosing the plasma current and electron density profiles in the Experimental Advanced Superconducting Tokamak (EAST). POINT has been operated routinely during the most recent experimental campaign and provides continuous 11 chord line-integrated Faraday effect and density measurement throughout the entire plasma discharge for all heating schemes and all plasma conditions (including ITER relevant scenario development)...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27907858/rapid-preparation-of-branched-and-degradable-aie-active-fluorescent-organic-nanoparticles-via-formation-of-dynamic-phenyl-borate-bond
#11
Zi Long, Meiying Liu, Liucheng Mao, Guangjian Zeng, Qing Wan, Dazhuang Xu, Fengjie Deng, Hongye Huang, Xiaoyong Zhang, Yen Wei
The fluorescent organic nanoparticles (FNPs) with aggregation-induced emission (AIE) feature have received increasing attention for their advanced optical properties. Although many efforts have been devoted to the fabrication and biomedical applications of AIE-active FNPs, the preparation of branched AIE-active FNPs with degradability through formation of dynamic bonds have rarely been reported. In this work, branched AIE-active FNPs were fabricated via dynamic linkage of hydrophobic hyperbranched and degradable Boltorn H40 (H40) with phenylboronic acid terminated AIE dye (PhB(OH)2) and mPEG (mPEG-B(OH)2), which relied on a facile one-pot strategy between phenylboronic acid and diol group of H40...
November 17, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27907259/spectral-diversity-area-relationships-for-assessing-biodiversity-in-a%C3%A2-wildland-agriculture-matrix
#12
Kyla Marie Dahlin
Species-area relationships have long been used to assess patterns of species diversity across scales. Here, this concept is extended to spectral diversity using hyperspectral data collected by NASA's Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) over western Michigan. This mixture of mesic forest and agricultural lands offers two end-points on the local-scale diversity continuum; one set of well-mixed forest patches and one set of highly homogeneous agricultural patches. Using the sum of the first three principal component values and the principal components' convex hull volume, spectral diversity was compared within and among these plots and to null expectations for perfectly random and perfectly patchy landscapes...
December 2016: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/27906510/thermohydrogel-containing-melanin-for-photothermal-cancer-therapy
#13
Miri Kim, Hyun Soo Kim, Min Ah Kim, Hyanghwa Ryu, Hwan-Jeong Jeong, Chang-Moon Lee
Melanin is an effective absorber of light and can extend to near infrared (NIR) regions. In this study, a natural melanin is presented as a photothermal therapeutic agent (PTA) because it provides a good photothermal conversion efficiency, shows biodegradability, and does not induce long-term toxicity during retention in vivo. Poloxamer solution containing melanin (Pol-Mel) does not show any precipitation and shows sol-gel transition at body temperature. After irradiation from 808 nm NIR laser at 1.5 W cm(-2) for 3 min, the photothermal conversion efficiency of Pol-Mel is enough to kill cancer cells in vitro and in vivo...
December 1, 2016: Macromolecular Bioscience
https://www.readbyqxmd.com/read/27906341/intra-half-cycle-interference-of-low-energy-photoelectron-in-strong-midinfrared-laser-fields
#14
Hui Xie, Min Li, Yang Li, Yueming Zhou, Peixiang Lu
Using semiclassical models with implementing interference effects, we study the low-energy photoelectron intra-half-cycle interferences among nonscattering trajectories and multiple forward scattering trajectories of atoms ionized by a strong mid-infrared laser field. Tracing back to the initial tunneling coordinates, we find that up to three kinds of forward scattering trajectories have substantial contributions to the low-energy photoelectrons. Those multiple forward scattering trajectories depend sensitively on the initial transverse momentum at the tunnel exit and they lead to sign reversal of the transverse momentum of the electrons...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906276/muscowert-multi-scale-consistence-of-weighted-edge-radon-transform-for-horizon-detection-in-maritime-images
#15
Dilip K Prasad, Deepu Rajan, Lily Rachmawati, Eshan Rajabally, Chai Quek
This paper addresses the problem of horizon detection, a fundamental process in numerous object detection algorithms, in a maritime environment. The maritime environment is characterized by the absence of fixed features, the presence of numerous linear features in dynamically changing objects and background and constantly varying illumination, rendering the typically simple problem of detecting the horizon a challenging one. We present a novel method called multi-scale consistence of weighted edge Radon transform, abbreviated as MuSCoWERT...
December 1, 2016: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/27899431/monitoring-process-water-quality-using-near-infrared-spectroscopy-and-partial-least-squares-regression-with-prediction-uncertainty-estimation
#16
Peter B Skou, Thilo A Berg, Stina D Aunsbjerg, Dorrit Thaysen, Morten A Rasmussen, Frans van den Berg
Reuse of process water in dairy ingredient production-and food processing in general-opens the possibility for sustainable water regimes. Membrane filtration processes are an attractive source of process-water recovery since the technology is already utilized in the dairy industry and its use is expected to grow considerably. At Arla Foods Ingredients (AFI), permeate from a reverse osmosis polisher filtration unit is sought to be reused as process water, replacing the intake of potable water. However, as for all dairy and food producers, the process-water quality must be monitored continuously to ensure food safety...
November 29, 2016: Applied Spectroscopy
https://www.readbyqxmd.com/read/27883061/unravelling-the-dynamical-origin-of-below-and-near-threshold-harmonic-generation-of-h2-in-an-intense-nir-laser-field
#17
John Heslar, Shih-I Chu
Recently, the study of near- and below- threshold regime harmonics as a potential source of intense coherent vacuum-ultraviolet radiation has received considerable attention. However, the dynamical origin of these lower harmonics, particularly for the molecular systems, is less understood and largely unexplored. Here we perform the first fully ab initio and high precision 3D quantum study of the below- and near-threshold harmonic generation of molecules in an intense 800-nm near-infrared (NIR) laser field. Combining with a synchrosqueezing transform of the quantum time-frequency spectrum and an extended semiclassical analysis, we explore in-depth the roles of various quantum trajectories, including short- and long trajectories, multiphoton trajectories, resonance-enhanced trajectories, and multiple rescattering trajectories of the below- and near- threshold harmonic generation processes...
November 24, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27877246/recent-advances-of-light-mediated-theranostics
#18
REVIEW
Xiangzhao Ai, Jing Mu, Bengang Xing
Currently, precision theranostics have been extensively demanded for the effective treatment of various human diseases. Currently, efficient therapy at the targeted disease areas still remains challenging since most available drug molecules lack of selectivity to the pathological sites. Among different approaches, light-mediated therapeutic strategy has recently emerged as a promising and powerful tool to precisely control the activation of therapeutic reagents and imaging probes in vitro and in vivo, mostly attributed to its unique properties including minimally invasive capability and highly spatiotemporal resolution...
2016: Theranostics
https://www.readbyqxmd.com/read/27877111/polymerizing-pyrrole-coated-poly-l-lactic-acid-co-%C3%AE%C2%B5-caprolactone-plcl-conductive-nanofibrous-conduit-combined-with-electric-stimulation-for-long-range-peripheral-nerve-regeneration
#19
Jialin Song, Binbin Sun, Shen Liu, Wei Chen, Yuanzheng Zhang, Chunyang Wang, Xiumei Mo, Junyi Che, Yuanming Ouyang, Weien Yuan, Cunyi Fan
Electrospinning and electric stimulation (ES) are both promising methods to support neuron adhesion and guide extension of neurons for nerve regeneration. Concurrently, all studies focus on either electrospinning for conduits material or ES in vitro study to accelerate nerve regeneration; few work on the combined use of these two strategies or ES in vivo study. Therefore, this study aimed to investigate the abilities of direct current ES through electrospinning conductive polymer composites composed of polypyrrole and Poly (l-lactic acid-co-ε-caprolactone) (PPY/PLCL) in peripheral nerve regeneration...
2016: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/27876392/metallothionein-assisted-periplasmic-lead-sequestration-as-lead-sulfite-by-providencia-vermicola-strain-sj2a
#20
Jaya Sharma, Kashif Shamim, Santosh Kumar Dubey, Ram Murti Meena
Lead resistant Providencia vermicola strain SJ2A was isolated from the waste of a battery manufacturing industry which could tolerate upto 3.0mM lead nitrate in the minimal medium. Interestingly, this isolate showed presence of a plasmid borne metallothionein gene, bmtA that matched significantly (96%) with that of Pseudomonas aeruginosa. Scanning electron micrographs of bacterial cells exposed to lead revealed a unique alteration in the cell morphology from rods to long inter-connected filaments. On the other hand, electron dispersive X-ray spectroscopy (EDX) clearly indicated no significant lead adsorption therefore, we speculated intracellular sequestration in this bacterial strain...
November 19, 2016: Science of the Total Environment
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