keyword
MENU ▼
Read by QxMD icon Read
search

Raman

keyword
https://www.readbyqxmd.com/read/28091716/rapid-concentration-detection-and-differentiation-of-bacteria-in-skimmed-milk-using-surface-enhanced-raman-scattering-mapping-on-4-mercaptophenylboronic-acid-functionalized-silver-dendrites
#1
Panxue Wang, Shintaro Pang, Brooke Pearson, Yayoi Chujo, Lynne McLandsborough, Mingtao Fan, Lili He
A novel method was developed to rapidly concentrate, detect, and differentiate bacteria in skimmed milk using surface enhanced Raman scattering (SERS) mapping on 4-mercaptophenylboronic acid (4-MPBA) functionalized silver (Ag) dendrites. The 4-MPBA functionalized Ag dendritic SERS substrate was used to capture the bacterial cells and enhance the bacterial signal. Salmonella, a significantly important food pathogen, was used as the representative strain to optimize and evaluate the developed method. The capture efficiency for Salmonella enterica subsp enterica BAA1045 (SE1045) was 84...
January 14, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28091714/comparison-of-potential-higher-order-reference-methods-for-total-haemoglobin-quantification-an-interlaboratory-study
#2
Claudia Frank, Christine Brauckmann, Marie Palos, Cristian G Arsene, Joerg Neukammer, Maria Estela Del Castillo Busto, Sabine Zakel, Claudia Swart, Bernd Güttler, Rainer Stosch
The total haemoglobin (Hb) concentration in blood is one of the most frequently measured analytes in clinical medicine because of its significance for evaluating the health state of a human. The spectrophotometric cyanmethaemoglobin (HiCN) method is the internationally accepted conventional reference method to determine this biomarker. It is frequently used in clinical routine diagnostics but is not traceable to the International System of Units and thus does not meet highest metrological demands. A further critical issue is the toxicity of the necessary potassium cyanide...
January 14, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28091676/hemispherical-platinum%C3%A2-%C3%A2-silver-core%C3%A2-%C3%A2-shell-nanoparticles-for-mirna-detection
#3
Elaine Spain, Kellie Adamson, Mohammad Elshahawy, Isabella Bray, Tia E Keyes, Raymond L Stallings, Robert J Forster
Defects within a self-assembled monolayer (SAM) of dodecanethiol on gold have been used as nucleation sites for the electrodeposition of mushroom shaped platinum nanoparticles (PtNPs). The top surfaces of these PtNPs were then decorated with a layer of silver creating a hemispherical - platinum : silver core : shell nanoparticle (Pt-AgNP). Thiolated probe strand miRNA was then immobilised onto the upper silver surface. These regioselectively modified particles were desorbed by applying a current jump to yield nanoparticles capable of hybridising to a complementary miRNA target with electrocatalysis occurring on the non-functionalized lower surface...
January 16, 2017: Analyst
https://www.readbyqxmd.com/read/28091675/a-highly-sensitive-sers-based-platform-for-zn-ii-detection-in-cellular-media
#4
Hongjun Zhuang, Zhenzhen Wang, Xiangchun Zhang, James A Hutchison, Wenfeng Zhu, Zhiyi Yao, Yuliang Zhao, Min Li
We report a highly sensitive and selective surface-enhanced Raman scattering (SERS)-based detection of aqueous Zn(ii) ions (limit of detection 10(-14) M). Spectral changes for a silver nanoparticle-bound Raman reporter upon Zn(ii) chelation constitutes the assay, which is applied to drinking water and to measurements of cellular uptake of Zn(ii).
January 16, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28091635/focused-electron-beam-based-direct-write-fabrication-of-graphene-and-amorphous-carbon-from-oxo-functionalized-graphene-on-silicon-dioxide
#5
Severin Schindler, Florian Vollnhals, Christian E Halbig, Hubertus Marbach, Hans-Peter Steinrück, Christian Papp, Siegfried Eigler
Controlled patterning of graphene is an important task towards device fabrication and thus is the focus of current research activities. Graphene oxide (GO) is a solution-processible precursor of graphene. It can be patterned by thermal processing. However, thermal processing of GO leads to decomposition and CO2 formation. Alternatively, focused electron beam induced processing (FEBIP) techniques can be used to pattern graphene with high spatial resolution. Based on this approach, we explore FEBIP of GO deposited on SiO2...
January 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28090771/differential-adhesive-bioactive-properties-of-polymeric-surface-coated-with-graphene-oxide-thin-film
#6
Sudhin Thampi, A Maya Nandkumar, Vignesh Muthuvijayan, Ramesh Parameswaran
Surface engineering of implantable devices involving polymeric biomaterials has become an essential aspect for medical implants. Surface enhancement technique can provide an array of unique surface properties that improves its biocompatibility and functionality as an implant. Polyurethane based implants that have found extensively acclaimed usage as an implant in biomedical applications, especially in the area of cardiovascular devices still lacks any mechanism to ward off bacterial or platelet adhesion. To bring out such a defense mechanism we are proposing a surface modification technique...
January 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28090610/highly-dispersible-edge-selectively-oxidized-graphene-with-improved-electrical-performance
#7
Jisoo Park, Yern Seung Kim, Sae Jin Sung, Taehoon Kim, Chong Rae Park
We prepared liquid phase exfoliated edge-selectively oxidized graphene (LPEOG) with a high concentration in water (∼14.7 mg ml(-1)) and a high ratio of a single layer (70%). The edge of graphite was selectively oxidized by step II oxidation of the modified Hummers method, and we subsequently exfoliated the edge-selectively oxidized graphite (EOG) into LPEOG. The edge selective oxidation of the LPEOG was confirmed by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), zeta-potentiometry, Raman spectroscopy, Fourier-transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM), and transmission electron microscopy (TEM)...
January 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28089930/scaffolds-containing-chitosan-gelatin-and-graphene-oxide-for-bone-tissue-regeneration-in-vitro-and-in-vivo
#8
S Saravanan, Anjali C, M Vairamani, T P Sastry, K S Subramanian, N Selvamurugan
Critical-sized bone defects are augmented with cell free and cell loaded constructs to bridge bone defects. Improving the properties of three-dimensional scaffolds with multiple polymers and others is of growing interest in recent decades. Chitosan (CS), a natural biopolymer has limitations for its use in bone regeneration, and its properties can be enhanced with other materials. In the present study, the composite scaffolds containing CS, gelatin (Gn) and graphene oxide (GO) were fabricated through freeze-drying...
January 12, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28089210/pm10-and-pm2-5-chemical-source-profiles-with-optical-attenuation-and-health-risk-indicators-of-paved-and-unpaved-road-dust-in-bhopal-india
#9
Shilpi Samiksha, Ramya Sunder Raman, Jayant Nirmalkar, Samresh Kumar, Rohit Sirvaiya
Size classified (PM10 and PM2.5) paved and unpaved road dust chemical source profiles, optical attenuation and potential health risk from exposure to these sources are reported in this study. A total of 45 samples from 9 paved road and 6 unpaved road sites located in and around Bhopal were re-suspended in the laboratory, collected onto filter substrates and subjected to a variety of chemical analyses. In general, road dust was enriched (compared to upper continental crustal abundance) in anthropogenic pollutants including Sb, Cu, Zn, Co, and Pb...
January 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28089029/guidelines-for-privileging-credentialing-and-proctoring-to-perform-gi-endoscopy
#10
Ashley L Faulx, Jenifer R Lightdale, Ruben D Acosta, Deepak Agrawal, David H Bruining, Vinay Chandrasekhara, Mohamad A Eloubeidi, Robert D Fanelli, Suryakanth R Gurudu, Loralee Kelsey, Mouen A Khashab, Shivangi Kothari, V Raman Muthusamy, Bashar J Qumseya, Aasma Shaukat, Amy Wang, Sachin B Wani, Julie Yang, John M DeWitt
No abstract text is available yet for this article.
February 2017: Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/28088863/detection-of-multi-configurational-states-of-hydrogen-passivated-silicene-nano-clusters
#11
Ricardo Pablo-Pedro, Hector Lopez-Rios, Serguei Fomine, Mildred S Dresselhaus
Utilizing density functional theory (DFT) and a complete active space self-consistent field (CASSCF) approach, we study the electronic properties of rectangle silicene nano clusters with hydrogen passivated edges denoted by H-SiNRs(nz,na), with nz and na representing the zigzag and armchair directions, respectively. The results show that in the nz direction, the H-SiNRs prefer to be in a singlet (S=0) ground state for nz > na. However, a transition from a singlet to a triplet (S=1) ground state is revealed for na> nz...
January 16, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28088569/design-of-%C3%AE-cyclodextrin-modified-tio2-nanotubes-for-the-adsorption-of-cu-ii-isotherms-and-kinetics-study
#12
Mohamed Triki, Haythem Tanazefti, Hafedh Kochkar
This paper builds on previous literature showing the interesting adsorptive properties of TiO2 nanotubes. It further explores the positive effect of β-cyclodextrin on these properties. Hence, β-cyclodextrin modified TiO2 nanotubes were successfully prepared and characterized by XRD, N2 physisorption at 77K, Raman, FTIR-ATR, (1)H NMR, TEM and EPR. The adsorptive interaction of Cu(II) with materials was investigated in aqueous solution at pH 9.25 (NH4(+)/NH3). The main conclusion is that copper(II)-ammonia complexation equilibria play an important role in the adsorption process...
January 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28088490/microwave-based-treatments-of-wheat-kernels-do-not-abolish-gluten-epitopes-implicated-in-celiac-disease
#13
Carmen Gianfrani, Gianfranco Mamone, Barbara la Gatta, Alessandra Camarca, Luigia Di Stasio, Francesco Maurano, Stefania Picascia, Vito Capozzi, Giuseppe Perna, Gianluca Picariello, Aldo Di Luccia
Microwave based treatment (MWT) of wet wheat kernels induced a striking reduction of gluten, up to <20 ppm as determined by R5-antibodybased ELISA, so that wheat could be labeled as gluten-free. In contrast, analysis of gluten peptides by G12 antibody-based ELISA, mass spectrometry-based proteomics and in vitro assay with T cells of celiac subjects, indicated no difference of antigenicity before and after MWT. SDS-PAGE analysis and Raman spectroscopy demonstrated that MWT simply induced conformational modifications, reducing alcohol solubility of gliadins and altering the access of R5-antibody to the gluten epitopes...
January 11, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28088435/editorial-comment
#14
Jay D Raman
No abstract text is available yet for this article.
January 11, 2017: Urology
https://www.readbyqxmd.com/read/28088285/plasmon-enhanced-fluorescence-imaging-with-silicon-based-silver-chips-for-protein-and-nucleic-acid-assay
#15
Bing Yuan, Xiangxu Jiang, Chu Yao, Meimei Bao, Jiaojiao Liu, Yujiang Dou, Yinze Xu, Yao He, Kai Yang, Yuqiang Ma
Metal-enhanced fluorescence shows great potential for improving the sensitivity of fluoroscopy, which has been widely used in protein and nucleic acid detection for biosensor and bioassay applications. In comparison with the traditional glass-supported metal nanoparticles (MNPs), the introduction of a silicon substrate has been shown to provide an increased surface-enhanced Raman scattering (SERS) effect due to the coupling between the MNPs and the semiconducting silicon substrate. In this work, we further study the fluorescence-enhanced effect of the silicon-supported silver-island (Ag@Si) plasmonic chips...
February 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28088279/archaeometric-analysis-of-roman-bronze-coins-from-the-magna-mater-temple-using-solid-state-voltammetry-and-electrochemical-impedance-spectroscopy
#16
Francesca Di Turo, Noemí Montoya, Joan Piquero-Cilla, Caterina De Vito, Fulvio Coletti, Gabriele Favero, Antonio Doménech-Carbó
Voltammetry of microparticles (VMP) and electrochemical impedance spectroscopy (EIS) techniques, complemented by SEM-EDX and Raman spectroscopy, were applied to a set of 15 Roman bronze coins and one Tessera from the temple of Magna Mater (Rome, Italy). The archaeological site, dated back between the second half and the end of the 4th century A.D., presented a complicated stratigraphic context. Characteristic voltammetric patterns for cuprite and tenorite for sub-microsamples of the corrosion layers of the coins deposited onto graphite electrodes in contact with 0...
February 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28088164/photochemical-generation-of-h2ncnx-h2nncx-h2nc-nx-x-o-s-in-low-temperature-matrices
#17
Tamás Vörös, Győző György Lajgút, Gábor Magyarfalvi, György Tarczay
The [NH2, C, N, O] and the [NH2, C, N, S] molecular systems were investigated by computational and matrix-isolation spectroscopic methods. The determination of the equilibrium structures and relative energies by CCSD(T) method was followed by the computation of the harmonic and anharmonic vibrational wavenumbers, infrared intensities, relative Raman activities, and UV excitation energies. These computed data were used to assist the identification of products obtained by UV laser photolysis of 3,4-diaminofurazan and 3,4-diaminothiadiazole in low-temperature Ar and Kr matrices...
January 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28088154/vibrational-properties-of-anhydrous-and-partially-hydrated-uranyl-fluoride
#18
M C Kirkegaard, J Langford, J Steill, B Anderson, A Miskowiec
Uranyl fluoride (UO2F2) is a hygroscopic powder with two main structural phases: an anhydrous crystal and a partially hydrated crystal of the same R3¯m symmetry. The formally closed-shell electron structure of anhydrous UO2F2 is amenable to density functional theory calculations. We use density functional perturbation theory (DFPT) to calculate the vibrational frequencies of the anhydrous crystal structure and employ complementary inelastic neutron scattering and temperature-dependent Raman scattering to validate those frequencies...
January 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28088121/synthesis-of-ctab-intercalated-graphene-and-its-application-for-the-adsorption-of-ar265-and-ao7-dyes-from-water
#19
Mohammed Yusuf, Moonis Ali Khan, Marta Otero, E C Abdullah, Masaaki Hosomi, Akihiko Terada, Shohei Riya
Environmental applications of graphene (GN) are limited by the occurrence of aggregation. Herein, graphene oxide (GO) was synthesized, reduced to GN by ascorbic acid, and intercalated with cetyltrimethylammonium bromide (CTAB). GN-CTAB was characterized by Boehm's titration, N2 adsorption/desorption, Fourier transform infrared spectroscopy, Raman spectroscopy, Fluorescence spectrophotometry, X-ray diffraction and Scanning electron microscopy. Then, GN-CTAB was used for the adsorptive removal of acid red 265 (AR265) and acid orange 7 (AO7) dyes from water both under batch and column operation...
January 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28088082/nature-of-phase-transitions-in-ammonium-oxofluorovanadates-a-vibrational-spectroscopy-study-of-nh4-3vo2f4-and-nh4-3vof5
#20
REVIEW
Yu V Gerasimova, A S Oreshonkov, N M Laptash, A N Vtyurin, A S Krylov, N P Shestakov, A A Ershov, A G Kocharova
Two ammonium oxofluorovanadates, (NH4)3VO2F4 and (NH4)3VOF5, have been investigated by temperature-dependent infrared and Raman spectroscopy methods to determine the nature of phase transitions (PT) in these compounds. Dynamics of quasioctahedral groups was simulated within the framework of semi-empirical approach, which justified the cis-conformation of VO2F4(3-) (C2v) and the C4v geometry of VOF5(3-). The observed infrared and Raman spectra of both compounds at room temperature (RT) revealed the presence at least of two crystallographically independent octahedral groups...
January 4, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
keyword
keyword
10933
1
2
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"