Read by QxMD icon Read

Surface plasmons

Jiafeng Ding, Gaoyuan Long, Yang Luo, Runze Sun, Mengxia Chen, Yajun Li, Yanfang Zhou, Xinhua Xu, Weirong Zhao
Polychlorinated dibenzo-p-dioxins (PCDDs), as a group of notorious anthropogenic environmental toxicants, are arguably ubiquitous in nature. In this study, we investigated the photocatalytic reductive dechlorination of 2-chlorodibenzo-p-dioxin (2-CDD) over Pd/g-C3 N4 catalysts under UV-vis irradiation. The g-C3 N4 and a series of Pd/g-C3 N4 catalysts were prepared by thermal polymerization and mechanical mixing-illumination method and characterized by XRD, TEM, BET, SEM and UV-vis DRS analyses. Among all the samples, the Pd/g-C3 N4 (5 wt%) yielded the optimal dechlorination activity with a total 2-CDD conversion of 54% within 4 h, and 76% of those converted 2-CDD were evolved to dibenzo-p-dioxin (DD)...
May 9, 2018: Journal of Hazardous Materials
Shuo Jia, Chao Bian, Jizhou Sun, Jianhua Tong, Shanhong Xia
The study presented herein investigated an easy preparation, high performance, wavelength-modulated LSPR optical fiber chemosensor coated by gold nanospheres(AuNS) for Hg2+ detection based on thymine-Hg2+ -thymine base pair mismatches and the coupled plasmonic resonance effect.Utilizing electrostatic self-assembly method, the high density and dispersivity monolayer AuNS coated LSPR fiber sensor had the near field refractive index sensitivity up to 2016 nm/RIU. The single-strand probe DNA served as a binding element for free AuNS labelled-target DNA conjugates was attached to the monolayer AuNS by Au-S bond...
May 8, 2018: Biosensors & Bioelectronics
Zhi Zhou, Shuimiao Zhao, Junyi Ni, Yilu Su, Lingui Wang, Yanlai Xu
C-type lectin is a superfamily of Ca2+ -dependent carbohydrate-recognition proteins that play significant roles in nonself-recognition and pathogen clearance. In the present study, a C-type lectin (PdC-Lectin) was chosen from stony coral Pocillopora damicornis to understand its recognition characteristics to zooxanthellae. PdC-Lectin protein contained a signal peptide and a carbohydrate-recognition domain with EPN motif in Ca2+ -binding site 2. The PdC-Lectin recombinant protein was expressed and purified in vitro...
May 15, 2018: Fish & Shellfish Immunology
Chong Cheen Ong, Subash C B Gopinath, Leong Wei Xian Rebecca, Veeradasan Perumal, Thangavel Lakshmipriya, Mohamed Shuaib Mohamed Saheed
There are different clotting factors present in blood, carries the clotting cascade and excessive bleeding may cause a deficiency in the clotting. Diagnosis of deficiency in clotting reduces the potential fatality. For enabling a sensor to detect the clotting factors, suitable probes such as antibody and aptamer have been used to capture the clotting factors on the sensing surface. Two major clotting factors were widely studied in detail for the diagnosis of clotting deficiency, which includes factor IX and thrombin...
May 15, 2018: International Journal of Biological Macromolecules
Hui-Chong Lau, Seonghee Jeong, Aeri Kim
Complex coacervates based on natural biopolymers have been explored as a protein delivery system to provide controlled release of loaded protein and circumvent its proteolytic degradation in chronic wounds. The coacervates composed of gelatin A (GA) and sodium alginate (SA) were optimized with respect to turbidity, size, zeta potential, and polydispersity index. Bovine serum albumin (BSA), a model protein, was effectively encapsulated in the coacervates, resulting in protection from trypsin digestion and controlled release...
May 15, 2018: International Journal of Biological Macromolecules
S Trautmann, M Richard-Lacroix, A Dathe, H Schneidewind, J Dellith, W Fritzsche, V Deckert
The optical response of realistic 3D plasmonic substrates composed of randomly shaped particles of different size and interparticle distance distributions in addition to nanometer scale surface roughness is intrinsically challenging to simulate due to computational limitations. Here, we present a Finite Element Method (FEM)-based methodology that bridges in-depth theoretical investigations and experimental optical response of plasmonic substrates composed of such silver nanoparticles. Parametrized scanning electron microscopy (SEM) images of surface enhanced Raman spectroscopy (SERS) active substrate and tip-enhanced Raman spectroscopy (TERS) probes are used to simulate the far-and near-field optical response...
May 18, 2018: Nanoscale
Huihui Huang, Zheyan Wang, Zhenggen Yang, Zhen Li, Ping Wang, Wenqi Dong
Objective To construct eukaryotic expression vectors of human IgE heavy chain 2-4 region (IgECepsilon2-4) and purify the recombinant protein, and then capture its interacted proteins by surface plasmon resonance (SPR). Methods Three recombinant eukaryotic expression vectors of IgECepsilon2-4 containing different signal peptides were constructed and transiently transfected into HEK293FT suspension cells separately. The recombinant plasmid with the highest-level expression was selected to express the recombinant protein in a huge amount, and then the recombinant protein was purified by Ni-NTA affinity chromatography...
March 2018: Xi Bao Yu Fen Zi Mian Yi Xue za Zhi, Chinese Journal of Cellular and Molecular Immunology
Giovanni Marinaro, Gobind Das, Andrea Giugni, Marco Allione, Bruno Torre, Patrizio Candeloro, Jurgen Kosel, Enzo Di Fabrizio
In this paper, we propose the use of a standing nanowires array, constituted by plasmonic active gold wires grown on iron disks, and partially immersed in a supporting alumina matrix, for surface-enhanced Raman spectroscopy applications. The galvanic process was used to fabricate nanowires in pores of anodized alumina template, making this device cost-effective. This fabrication method allows for the selection of size, diameter, and spatial arrangement of nanowires. The proposed device, thanks to a detailed design analysis, demonstrates a broadband plasmonic enhancement effect useful for many standard excitation wavelengths in the visible and NIR...
May 17, 2018: Materials
Xiaoli Wang, Jiao Wang, Wenmei Zhang, Boye Li, Ying Zhu, Qin Hu, Yishu Yang, Xiaoguang Zhang, Hong Yan, Yi Zeng
Here, we report the anti-human immunodeficiency virus (HIV) potency and underlying mechanisms of a Keggin polyoxometalate (PT-1, K₆HPTi₂W10 O40 ). Our findings showed that PT-1 exhibited highly potent effects against a diverse group of HIV type 1 (HIV-1) strains and displayed low cytotoxicity and genotoxicity. The time-addition assay revealed that PT-1 acted at an early stage of infection, and these findings were supported by the observation that PT-1 had more potency against Env-pseudotyped virus than vesicular stomatitis virus glycoprotein (VSVG) pseudotyped virus...
May 16, 2018: Viruses
Hui Wang, Zhuang Xue, Zhaoqun Liu, Weilin Wang, Feifei Wang, Ying Wang, Lingling Wang, Linsheng Song
C-type lectins (CTLs) are Ca2+ dependent carbohydrate-binding proteins that share structural homology in their carbohydrate-recognition domains (CRDs). In the present study, a novel CTL was identified from sea cucumber Apostichopus japonicus (named as AjCTL-2). The deduced amino acid sequence of AjCTL-2 was homologous to CTLs from other animals with the identities ranging from 33% to 40%. It contained a canonical signal peptide at the N-terminus, a low density lipoprotein receptor class A (LDLa), a C1r/C1s/Uegf/bone morphogenetic protein 1 (CUB), and a CRD with two motif Glu-Pro-Asn (EPN) and Trp-Asn-Asp (WND) in Ca2+ binding site 2...
May 14, 2018: Fish & Shellfish Immunology
Siying Liu, Xiang-Dong Tian, Yun Zhang, Jian-Feng Li
The realization of surface-enhanced Raman spectroscopy (SERS) to be a reliable quantitative analytical technique requires sensitive and reproducible enhancing substrates. Here, uniform three-dimensional (3D) Ag nanorod (AgNR) substrates with well-defined interlayer spacings are prepared through the air-liquid interface-assisted self-assembly of AgNR in a layer-by-layer manner. The correlation of the SERS performance with the 3D AgNR structures is performed by SERS mapping the substrates. SERS mapping reveals the excellent enhancement uniformity of the 3D substrates with the relative standard deviation (RSD) less than 10%...
May 17, 2018: Analytical Chemistry
Jing Fang, Jiajun Gu, Qinglei Liu, Wang Zhang, Huilan Su, Di Zhang
Localized surface plasmon resonance (LSPR) of plasmonic metals (e.g. Au) can help semiconductors improve their photocatalytic hydrogen (H2) production performance. However, artificial synthesis of hierarchical plasmonic structures down to nanoscales is usually difficult. Here, we adopt butterfly wing scales from Morpho didius to fabricate three dimensional (3D) CdS/Au butterfly wing scales for plasmonic photocatalysis. The as-prepared materials well inherit the pristine hierarchical bio-structures. The 3D CdS/Au butterfly wing scales exhibit high H2 production rate (221...
May 17, 2018: ACS Applied Materials & Interfaces
John Biggins, Sadegh Yazdi, Emilie Ringe
Nanoparticles of some metals (Cu/Ag/Au) sustain oscillations of their electron cloud called localized surface plasmon resonances (LSPRs). These resonances can occur at optical frequencies and be driven by light, generating enhanced electric fields and spectacular photon scattering. However, current plasmonic metals are rare, expensive, and have a limited resonant frequency range. Recently, much attention has been focused on earth-abundant Al, but Al nanoparticles cannot resonate in the IR. The earth-abundant Mg nanoparticles reported here surmount this limitation...
May 17, 2018: Nano Letters
Hiroyuki Sekiguchi, Kentaro Uchida, Osamu Matsushita, Gen Inoue, Nozomu Nishi, Ryo Masuda, Nana Hamamoto, Takaki Koide, Shintaro Shoji, Masashi Takaso
Basic fibroblast growth factor 2 (bFGF) accelerates bone formation during fracture healing. Because the efficacy of bFGF decreases rapidly following its diffusion from fracture sites, however, repeated dosing is required to ensure a sustained therapeutic effect. We previously developed a fusion protein comprising bFGF, a polycystic kidney disease domain (PKD; s2b), and collagen-binding domain (CBD; s3) sourced from the Clostridium histolyticum class II collagenase, ColH, and reported that the combination of this fusion protein with a collagen-like peptide, poly(Pro-Hyp-Gly)10 , induced mesenchymal cell proliferation and callus formation at fracture sites...
2018: BioMed Research International
Soo Hyeon Lim, Youmie Park
Green strategies to synthesize gold nanoparticles have attracted a substantial amount of attention because global sustainability is a focal issue in many research areas. In the present study, rosmarinic acid was utilized as a reducing agent to reduce gold ions to gold nanoparticles. The characteristic surface plasmon resonance of gold nanoparticles was observed at 532 nm with a pink-colored colloidal solution. High-resolution transmission electron microscopy (HR-TEM) revealed the presence of spherical nanoparticles along with triangular nanoplates...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Anuraj Kshirsagar, Tanaya Khanna, Vaishali Dhanwe, Kunal H Kate, Pawan K Khanna
Avoiding use of environmentally hazardous reducing agents and surfactants like sodium borohydride, hydrazine hydrate, alkyl amines and alkyl phosphines, the current article describes successful synthesis of silver nanoparticles via green synthesis by employing coconut, Indian gooseberry (amla), almond and mustard oils as capping as well as reducing agents. The presence of various fatty acids in such edible oils act as capping agents through their carboxylic acid functionality and control the growth of nanoparticles...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Mubashir Hussain, Naveed Iqbal Raja, Zia-Ur-Rehman Mashwani, Farah Naz, Muhammad Iqbal, Sumaira Aslam
The synthesis of nanoparticles by utilising plant extract has revolutionised the field of nanotechnology. In the present study, AgNPs were synthesised by utilising the leaves of Moringa oleifera as reducing and stabilising agent. UV-visible spectroscopy showed characteristic surface plasmon band in the range of 413-420 nm. Scanning electron microscopy (SEM) elucidated rectangular segments fused together. X-ray diffraction (XRD) analysis confirmed the crystalline nature of AgNPs and presence of metallic silver ions was confirmed by energy dispersive X-ray (EDX)...
June 2018: IET Nanobiotechnology
Seetharaman Prabukumar, Chandrasekaran Rajkuberan, Gnanasekar Sathishkumar, Mani Illaiyaraja, Sivaperumal Sivaramakrishnan
In this study, the leaf extract of an important medicinal plant Crescentia cujete L. (CC) was employed as a green reducing agent to synthesise highly-stable C. cujete silver nanoparticles (CCAgNPs). The reduction of Ag+ to Ag0 nanoparticles was initially observed by a colour change which generates an intense surface plasmon resonance peak at 417 nm using a UV-Vis spectrophotometer. Various optimisation factors such as temperature, pH, time and the stoichiometric proportion of the reaction mixture were performed, which influence the size, dispersity and synthesis rate of CCAgNPs...
June 2018: IET Nanobiotechnology
Sravani Kantipudi, Jhansi Rani Sunkara, Muralikrishna Rallabhandi, Chandi Vishala Thonangi, Raga Deepthi Cholla, Pratap Kollu, Madhu Kiran Parvathaneni, Sri Venkata Narayana Pammi
In the present study, silver (Ag) and Ag-zinc oxide (ZnO) composite nanoparticles (NPs) were synthesised and studied their wound-healing efficacy on rat model. Ultraviolet-visible spectroscopy of AgNPs displayed an intense surface plasmon (SP) resonance absorption at 450 nm. After the addition of aqueous Zn acetate solution, SP resonance band has shown at 413.2 nm indicating a distinct blue shift of about 37 nm. X-ray diffraction analysis Ag-ZnO composite NPs displayed existence of two mixed sets of diffraction peaks, i...
June 2018: IET Nanobiotechnology
Aghil Esmaeili-Bandboni, Seyed Mohammad Amini, Reza Faridi-Majidi, Jamshid Bagheri, Javad Mohammadnejad, Esmaeil Sadroddiny
MiR-155 plays a critical role in the formation of cancers and other diseases. In this study, the authors aimed to design and fabricate a biosensor based on cross-linking gold nanoparticles (AuNPs) aggregation for the detection and quantification of miR-155. Also, they intended to compare this method with SYBR Green real-time polymerase chain reaction (PCR). Primers for real-time PCR, and two thiolated capture probes for biosensor, complementary with miR-155, were designed. Citrate capped AuNPs (18.7 ± 3...
June 2018: IET Nanobiotechnology
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"