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https://www.readbyqxmd.com/read/28813607/nonlinear-raman-effects-enhanced-by-surface-plasmon-excitation-in-planar-refractory-nano-antennas
#1
Sergey S Kharintsev, Anton Kharitonov, Semion Saikin, Alexander M Alekseev, Sergei G Kazarian
We consider a nonlinear mechanism of localized light inelastic scattering within nano-patterned plasmonic and Raman-active titanium nitride (TiN) thin films exposed to continuous-wave (cw) modest-power laser light. Owing to the strong third-order nonlinear interaction between optically excited broadband surface plasmons and localized Stokes and anti-Stokes waves, both stimulated and inverse Raman effects can be observed. We provide experimental evidences for coherent amplification of the localized Raman signals using a planar square shaped refractory antenna...
August 16, 2017: Nano Letters
https://www.readbyqxmd.com/read/28813601/platinum-decorated-gold-nanoparticles-with-dual-functionalities-for-ultrasensitive-colorimetric-in-vitro-diagnostics
#2
Zhuangqiang Gao, Haihang Ye, Dianyong Tang, Jing Tao, Sanaz Habibi, Adriene Minerick, Dianping Tang, Xiaohu Xia
Au nanoparticles (AuNPs) as signal reporters have been utilized in colorimetric in vitro diagnostics (IVDs) for decades. Nevertheless, it remains a grand challenge to substantially enhance the detection sensitivity of AuNP-based IVDs as confined by the inherent plasmonics of AuNPs. In this work, we circumvent this confinement by developing a unique dual-functional AuNPs that were engineered by coating conventional AuNPs with ultrathin Pt skins of sub-10 atomic layers (i.e., Au@Pt NPs). The Au@Pt NPs retain the plasmonic activity of initial AuNPs, while possess ultrahigh catalytic activity enabled by Pt skins...
August 16, 2017: Nano Letters
https://www.readbyqxmd.com/read/28812125/recombinant-expression-and-biochemical-characterization-of-mycobacterium-tuberculosis-3fe-4s-ferredoxin-rv1786
#3
Yun Lu, Feng Qiao, Yue Li, Xiao-Hong Sang, Cong-Ran Li, Jian-Dong Jiang, Xin-Yi Yang, Xue-Fu You
Ferredoxins are iron-sulfur protein that mediate electron transfer in cytochrome P450 mono-oxygenase (CYP)-related catalytic reactions in a wide variety of organisms. Rv1786 is a putative ferredoxin, encoded by a gene located downstream of the gene encoding CYP143A1 in the Mycobacterium tuberculosis genome. However, the structure and function of Rv1786 have remained unclear. Here, the recombinant Mtb Rv1786 was expressed, purified as a His-tagged form and characterized with [3Fe-4S] clusters as its cofactors using a series of measurements including SDS-PAGE, western blot, UV/Visible, MALDI-TOF/TOF-MS, and electron paramagnetic resonance spectroscopic analysis...
August 15, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28811657/colorimetric-fingerprints-of-gold-nanorods-for-discriminating-catecholamine-neurotransmitters-in-urine-samples
#4
Somayeh Jafarinejad, Mahmoud Ghazi-Khansari, Forough Ghasemi, Pezhman Sasanpour, M Reza Hormozi-Nezhad
Catecholamine neurotransmitters, generally including dopamine (DA), epinephrine (EP) and norepinephrine (NE) are known as substantial indicators of various neurological diseases. Simultaneous detection of these compounds and their metabolites is highly recommended in early clinical diagnosis. To this aim, in the present contribution, a high performance colorimetric sensor array has been proposed for the detection and discrimination of catecholamines based on their reducing ability to deposit silver on the surface of gold nanorods (AuNRs)...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811462/observation-of-hybrid-tamm-plasmon-exciton-polaritons-with-gaas-quantum-wells-and-a-mose2-monolayer
#5
Matthias Wurdack, Nils Lundt, Martin Klaas, Vasilij Baumann, Alexey V Kavokin, Sven Höfling, Christian Schneider
Strong light matter coupling between excitons and microcavity photons, as described in the framework of cavity quantum electrodynamics, leads to the hybridization of light and matter excitations. The regime of collective strong coupling arises, when various excitations from different host media are strongly coupled to the same optical resonance. This leads to a well-controllable admixture of various matter components in three hybrid polariton modes. Here, we study a cavity device with four embedded GaAs quantum wells hosting excitons that are spectrally matched to the A-valley exciton resonance of a MoSe2 monolayer...
August 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28811026/multiple-epitope-presentation-and-surface-density-control-enabled-by-chemoselective-immobilization-lead-to-enhanced-performance-in-ige-binding-fingerprinting-on-peptide-microarrays
#6
Alessandro Gori, Marina Cretich, Renzo Vanna, Laura Sola, Paola Gagni, Giulia Bruni, Marta Liprino, Furio Gramatica, Samuele Burastero, Marcella Chiari
Multiple ligand presentation is a powerful strategy to enhance the affinity of a probe for its corresponding target. A promising application of this concept lies in the analytical field, where surface immobilized probes interact with their corresponding targets in the context of complex biological samples. Here we investigate the effect of multiple epitope presentation (MEP) in the challenging context of IgE-detection in serum samples using peptide microarrays, and evaluate the influence of probes surface density on the assay results...
August 29, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28810663/different-properties-of-polysialic-acids-synthesized-by-the-polysialyltransferases-st8sia2-and-st8sia4
#7
Airi Mori, Masaya Hane, Yuki Niimi, Ken Kitajima, Chihiro Sato
Polysialic acid (polySia) is mainly found as a modification of neural cell adhesion molecule (NCAM) in whole embryonic brains, as well as restricted areas of adult vertebrate brains, including the hippocampus. PolySia shows not only repulsive effects on NCAM-involved cell-cell interactions due to its bulky and hydrated properties, but also attractive effects on the interaction with neurologically active molecules, which exerts a reservoir function. Two different polysialyltransferases, ST8SIA2 and ST8SIA4, are involved in the synthesis of polySia chains; however, to date, the differences of the properties between polySia chains synthesized by these two enzymes remain unknown...
September 1, 2017: Glycobiology
https://www.readbyqxmd.com/read/28810197/photochemical-formation-of-chitosan-stabilized-near-infrared-absorbing-silver-nanoworms-a-green-synthetic-strategy-and-activity-on-gram-negative-pathogenic-bacteria
#8
Sreekar Marpu, Samar S Kolailat, Daniel Korir, Brian L Kamras, Ratnesh Chaturvedi, Abel Joseph, Christopher M Smith, Misael C Palma, Jyoti Shah, Mohammad A Omary
A facile, single-step, non-seeded photochemical protocol for producing a new type of anisotropic silver nanostructure, "nanoworms", with curved longer dimensions and smooth, rounded edges. The nanoworms exhibit surface plasmon resonance (SPR) absorption in the near-infrared window (NIRW) region and are stabilized using biocompatible polymer chitosan, rendering biocompatibility and amplified safety for biological utility of the composition. Both NIRW-absorbing nanoworms and visible-absorbing nanospheres herein are attained exclusively by employing green chemistry principles...
August 4, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28809887/fano-resonance-based-mode-matching-hybrid-metasurface-for-enhanced-second-harmonic-generation
#9
Zhi Li, Wenwei Liu, Zhancheng Li, Hua Cheng, Shuqi Chen, Jianguo Tian
Plasmonic nanostructures have been considered as potential candidates for enhancing the nonlinear upconversion rate at nanoscale levels due to their strong near-field enhancement. Here, we propose a Fano-resonance-based mode-matching hybrid metasurface that combines the advantages of Fano resonances and mode-matching for boosting second-harmonic conversion. A confined and strong near-field intensity is generated by gold nanoantennas within the volume of polycrystalline zinc sulfide nanoparticles, thus resulting in a larger effective second-harmonic coefficient...
August 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28809873/generating-broadband-vortex-modes-in-ring-core-fiber-by-using-a-plasmonic-q-plate
#10
Jingfu Ye, Yan Li, Yanhua Han, Duo Deng, Xiaoya Su, He Song, Jianmin Gao, Shiliang Qu
A mode convertor was proposed and investigated for generating vortex modes in a ring-core fiber based on a plasmonic q-plate (PQP), which is composed of specially organized L-shaped resonator (LSR) arrays. A multicore fiber was used to transmit fundamental modes, and the LSR arrays were used to modulate phases of these fundamental modes. Behind the PQP, the transmitted fundamental modes with gradient phase distribution can be considered as the incident lights for generating broadband vortex modes in the ring-core fiber filter...
August 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28809573/intrinsic-plasmon-phonon-interactions-in-highly-doped-graphene-a-near-field-imaging-study
#11
Francisco J Bezares, Adolfo De Sanctis, Jose R M Saavedra, Achim Woessner, Pablo Alonso-González, Iban Amenabar, Jianing Chen, Thomas Bointon, Siyuan Dai, Michael M Fogler, D N Basov, Rainer Hillenbrand, Monica Felicia Craciun, F Javier Garcia de Abajo, Saverio Russo, Frank H L Koppens
As a two-dimensional semi-metal, graphene offers clear advantages for plasmonic applications over conventional metals, such as stronger optical field confinement, in situ tunability and relatively low intrinsic losses. However, the operational frequencies at which plasmons can be excited in graphene are limited by the Fermi energy EF, which in practice can be controlled electrostatically only up to a few tenths of an electronvolt. Higher Fermi energies open the door to novel plasmonic devices with unprecedented capabilities, particularly at mid-infrared and shorter-wave infrared frequencies...
August 15, 2017: Nano Letters
https://www.readbyqxmd.com/read/28809545/plasmonic-nanoprobe-of-gold-triangular-nanoprism-core-polyaniline-shell-for-real-time-three-dimensional-ph-imaging-of-anterior-chamber
#12
Peijun Tang, Xueqin Jiang, Yangyang Wang, Huanjun Chen, Yu Shrike Zhang, Panpan Gao, Hao Wang, Xuemeng Li, Jianhua Zhou
Three-dimensional (3D) molecular imaging enables the study of biological processes in both living and nonviable systems at the molecular level and has a high potential on early diagnosis. In conjunction with specific molecular probes, optical coherent tomography (OCT) is a promising imaging modality to provide 3D molecular features at the tissue level. In this study, we introduced (gold-triangular-nanoprism-core)/(polyaniline-shell nanoparticles) (GTNPs@PANI) as an OCT contrast agent and pH-responsive nanoprobe for 3D imaging of pH distribution...
August 15, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28809413/tumor-targeted-nanoprobes-for-enhanced-multimodal-imaging-and-synergistic-photothermal-therapy-core-shell-and-dumbbell-gd-tailored-gold-nanorods
#13
Jinchang Yin, Deqi Chen, Shuangshuang Wu, Chaorui Li, Lizhi Liu, Yuanzhi Shao
Multifunctional nanoprobes, due to their unique nanocomposite structures, have prominent advantages that combine multimodal imaging of a tumor with photothermal therapy. However, they remain a challenge for constructing nanostructures via conventional approaches due to the peculiar environmental sensitivity of each component. Here, we report the design and synthesis of Gd-based nanoparticle-tailored gold nanorods with distinctive core-shell and dumbbell nanoarchitectures (NAs) by a specific synthesis technology...
August 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/28808810/interactions-of-cisplatin-analogues-with-lysozyme-a-comparative-analysis
#14
Giarita Ferraro, Ilaria De Benedictis, Annamaria Malfitano, Giancarlo Morelli, Ettore Novellino, Daniela Marasco
The biophysical characterization of drug binding to proteins plays a key role in structural biology and in the discovery and optimization of drug discovery processes. The search for optimal combinations of biophysical techniques that can correctly and efficiently identify and quantify binding of metal-based drugs to their final target is challenging, due to the physicochemical properties of these agents. Different cisplatin derivatives have shown different citotoxicities in most common cancer lines, suggesting that they exert their biological activity via different mechanisms of action...
August 14, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28808719/a-new-strategy-for-effective-distance-regulation-of-the-surface-plasmon-assisted-coupling-reaction-of-p-nitrothiophenol-to-p-p-dimercaptoazobenzene
#15
Lixin Xia, Caiqing Ma, Jing Wang, Shiwei Wu, Yu Liu, Qian Zhang, Peng Song
Plasmon assisted reactions on a metal surface occur through a different mechanism compared to traditional reaction conditions. Based on a SERS study of the model plasmon assisted reaction of PNTP to DMAB, we present the first regulation strategy for these reactions, enabled here, through the controlled adjustment of acidic properties.
August 15, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28808381/characterization-antibacterial-and-antioxidant-properties-of-silver-nanoparticles-synthesized-from-aqueous-extracts-of-allium-sativum-zingiber-officinale-and-capsicum-frutescens
#16
Gloria Aderonke Otunola, Anthony Jide Afolayan, Emmanuel Olusegun Ajayi, Samuel Wale Odeyemi
BACKGROUND: Herbal drug delivery is limited by poor solubility and bioavailability which can be overcome with suitable nanomaterials that will enhance their pharmacokinetics and performance. OBJECTIVE: This study aimed to analyze the synthesis, characterization, and biological activities of silver nanoparticles (AgNPs) from three spices. MATERIALS AND METHODS: AgNPs were prepared using 0.1 M silver nitrate and aqueous extracts of Allium sativum L...
July 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28808350/fano-resonance-rabi-splitting-of-surface-plasmons
#17
Zhiguang Liu, Jiafang Li, Zhe Liu, Wuxia Li, Junjie Li, Changzhi Gu, Zhi-Yuan Li
Rabi splitting and Fano resonance are well-known physical phenomena in conventional quantum systems as atoms and quantum dots, arising from strong interaction between two quantum states. In recent years similar features have been observed in various nanophotonic and nanoplasmonic systems. Yet, realization of strong interaction between two or more Fano resonance states has not been accomplished either in quantum or in optical systems. Here we report the observation of Rabi splitting of two strongly coupled surface plasmon Fano resonance states in a three-dimensional plasmonic nanostructure consisting of vertical asymmetric split-ring resonators...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28808262/generation-of-broadband-ultraviolet-frequency-entangled-photons-using-cavity-quantum-plasmonics
#18
Hisaki Oka
Application of quantum entangled photons is now extending to various fields in physics, chemistry and biology. In particular, in terms of application to molecular science, broadband ultraviolet frequency-entangled photons are desired because molecules inducing photochemical reactions of interest often have electronic transition energies in the ultraviolet region. Recent standard method for generating such entangled photons is a chirped quasi-phase-matching method, however this method is not suitable for the generation of ultraviolet frequency-entangled photons because it requires down-conversion of a photon with a wavelength shorter than ultraviolet into an entangled photon pair...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28808248/half-spaced-substrate-integrated-spoof-surface-plasmon-polaritons-based-transmission-line
#19
Jian Feng Zhu, Shao Wei Liao, Shu Fang Li, Quan Xue
In this paper, a new spoof surface plasmon polaritons (SPPs) based transmission line (TL) with semi-open structure is proposed, which is implemented on a single-layer substrate with metallized via holes planted on a ground plane. The electromagnetic (EM) power propagates along it in the form of controlled slow surface wave, which is the same with its existing counterparts. The proposed TL can adjust the degree of EM energy confinement, and thus balance its performance in every characteristic, in particular attenuation and interference...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28808021/kinetic-and-high-throughput-profiling-of-epigenetic-interactions-by-3d-carbene-chip-based-surface-plasmon-resonance-imaging-technology
#20
Shuai Zhao, Mo Yang, Wenfei Zhou, Baichao Zhang, Zhiqiang Cheng, Jiaxin Huang, Min Zhang, Zhiyou Wang, Rui Wang, Zhonglei Chen, Jinsong Zhu, Haitao Li
Chemical modifications on histones and DNA/RNA constitute a fundamental mechanism for epigenetic regulation. These modifications often function as docking marks to recruit or stabilize cognate "reader" proteins. So far, a platform for quantitative and high-throughput profiling of the epigenetic interactome is urgently needed but still lacking. Here, we report a 3D-carbene chip-based surface plasmon resonance imaging (SPRi) technology for this purpose. The 3D-carbene chip is suitable for immobilizing versatile biomolecules (e...
August 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
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