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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/28812125/recombinant-expression-and-biochemical-characterization-of-mycobacterium-tuberculosis-3fe-4s-ferredoxin-rv1786
#2
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
#3
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/28811026/multiple-epitope-presentation-and-surface-density-control-enabled-by-chemoselective-immobilization-lead-to-enhanced-performance-in-ige-binding-fingerprinting-on-peptide-microarrays
#4
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
#5
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
#6
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/28809413/tumor-targeted-nanoprobes-for-enhanced-multimodal-imaging-and-synergistic-photothermal-therapy-core-shell-and-dumbbell-gd-tailored-gold-nanorods
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
https://www.readbyqxmd.com/read/28806865/glucose-sensitive-holographic-bio-sensors-fundamentals-and-applications
#15
Marjan Heidari, Bahareh Dabirmanesh, Hossein Mahdavi, Khosro Khajeh
Nowadays sensors and especially biosensors play an important role in medical diagnosis and detection of food and environment contaminations. Biosensors’ facilities have been improved significantly by using technologies such as surface plasmon resonance, microfluidics, laser, and electrochemistry. These technologies are now available on chips in micro- and nano-scale and are capable of measuring the quantity of more than one analyte at once. One branch of these sensors is the holographic (bio)sensor. Reflection holographic sensors, which are optical devices fabricated based on Bragg’s law, can diffract light with specific wavelength as they absorb or release special ions or molecule depending on their polymer structure...
August 15, 2017: Iranian Biomedical Journal
https://www.readbyqxmd.com/read/28806670/transmission-surface-plasmon-resonance-techniques-and-their-potential-biosensor-applications
#16
REVIEW
Chutiparn Lertvachirapaiboon, Akira Baba, Sanong Ekgasit, Kazunari Shinbo, Keizo Kato, Futao Kaneko
Transmission surface plasmon resonance (TSPR) is an unusual extraordinary optical transmission that is more transparent at certain wavelengths than expected by classical theory. The three main plasmonic structures that providing this phenomenon are nanohole arrays, diffraction gratings, and nanoslit arrays. This extraordinary optical transmission phenomenon is produced as a result of surface plasmon excitations. The shifting in TSPR responses upon changing of dielectric environment at the surface of a metallic film was observed...
August 1, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28806656/sensitive-surface-enhanced-raman-scattering-of-tio2-ag-nanowires-induced-by-photogenerated-charge-transfer
#17
Xin Zhao, Weiwei Zhang, Chuchu Peng, Yujie Liang, Wenzhong Wang
In this work, the semiconductor TiO2 nanowires were successfully coupled with plasmonic metal Ag nanoparticles to fabricate hybrid nanostructures with enhanced sensitive Raman substrate. The SERS activities of fabricated hybrid nanostructures were evaluated by detecting the Raman signals of R6G molecules. The fabricated TiO2/Ag nanowire/nanoparticle hybrid nanostructures show sensitive detection ability for R6G molecules. Based on the band structures of Ag nanoparticle, TiO2 nanowire and R6G molecule, the enhanced sensitive SERS activities of hybrid nanostructures is ascribed to an efficient charge transfer process, in which the photogenerated electrons transfer to the conduction band of TiO2 nanowires from metal Ag nanoparticles, and then to LUMO level of R6G molecules, leading to enhanced SERS activities...
August 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28806525/imaging-the-localized-plasmon-resonance-modes-in-graphene-nanoribbons
#18
Fengrui Hu, Yilong Luan, Zhe Fei, Igor Palubski, Michael Goldflam, Siyuan Dai, Jhih-Sheng Wu, Kirk W Post, Guido Janssen, Michael M Fogler, D N Basov
We report a nano-infrared (IR) imaging study of the localized plasmon resonance modes of graphene nanoribbons (GNRs) using a scattering-type scanning near-field optical microscope (s-SNOM). By comparing the imaging data of GNRs that are aligned parallel and perpendicular to the in-plane component of the excitation laser field, we observed symmetric and asymmetric plasmonic interference fringes, respectively. Theoretical analysis indicates that the asymmetric fringes are formed due to the interplay between the localized surface plasmon resonance (SPR) mode excited by the GNRs and the propagative surface plasmon polariton (SPP) mode launched by the s-SNOM tip...
August 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/28806065/synthesis-characterization-and-selective-delivery-of-darpin-gold-nanoparticle-conjugates-to-cancer-cells
#19
Sergey Deyev, Galina Proshkina, Anastasiya Ryabova, Francesco Tavanti, Maria Cristina Menziani, Gennady Eidelshtein, Gabriel Avishai, Alexander B Kotlyar
We demonstrate that the designed ankyril repeat protein (DARPin) _9-29, which specifically targets human epidermal growth factor receptor 2 (HER 2), binds tightly to gold nanoparticles (GNPs). Binding of the protein strongly increases the colloidal stability of the particles. The results of experimental analysis and molecular dynamics simulations show that approximately 35 DARPin _9-29 molecules are bound to the surface of a 5 nm GNP and that the binding does not involve the receptor-binding domain of the protein...
August 14, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28805498/gingiskhan%C3%A2-protease-cleavage-allows-a-high-throughput-antibody-to-fab-conversion-enabling-direct-functional-assessment-during-lead-identification-of-human-monoclonal-and-bispecific-igg1-antibodies
#20
Jörg Moelleken, Manuel Endesfelder, Christian Gassner, Sabine Lingke, Simone Tomaschek, Oksana Tyshchuk, Stefan Lorenz, Ulrike Reiff, Michael Mølhøj
The determination of the binding strength of immunoglobulins (IgGs) to targets can be influenced by avidity when the targets are soluble di- or multimeric proteins, or associated to cell surfaces, including surfaces introduced from heterogeneous assays. However, for the understanding of the contribution of a second drug-to-target binding site in molecular design, or for ranking of monovalent binders during lead identification, affinity-based assessment of the binding strength is required. Typically, monovalent binders like antigen-binding fragments (Fabs) are generated by proteolytic cleavage with papain, which often results in a combination of under- and over-digestion, and requires specific optimization and chromatographic purification of the desired Fabs...
August 14, 2017: MAbs
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