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Yan Li, Mourad Harir, Marianna Lucio, Michael Gonsior, Boris P Koch, Philippe Schmitt-Kopplin, Norbert Hertkorn
Deciphering the molecular codes of dissolved organic matter (DOM) improves our understanding of its role in the global element cycles and its active involvement in ecosystem services. This study demonstrates comprehensive characterization of DOM by an initial polarity-based stepwise solid phase extraction (SPE) with single methanol elution of the cartridges, but separate collection of equal aliquots of eluate. The reduction of molecular complexity in the individual DOM fractions attenuates intermolecular interactions and substantially increases the disposable resolution of any structure selective characterization...
October 14, 2016: Water Research
Yang Wu, Xueyong Li, Xiaowen Shi, Yingfei Zhan, Hu Tu, Yumin Du, Hongbing Deng, Linbin Jiang
When an efficient automated coating machine is used to process layer-by-layer (LBL) deposited nanofibrous mats, it causes an obvious planar effect on the surface of the mats, which can be eliminated through ultimate immersion. During this process, chitosan (CS) - rectorite (REC) intercalated composite films are built on the surface of cellulose acetate (CA) nanofibrous mats by a coating machine. Then, the immersion process is utilized to allow positively charged CS or CS-REC intercalated composites to uniformly assemble on the surface of negatively charged CA nanofibers...
October 17, 2016: Colloids and Surfaces. B, Biointerfaces
Fu-Yan Xing, Lin-Lin Guan, Yan-Long Li, Chun-Juan Jia
This work reports a one-step simple synthesis method for functionalized reduced graphene oxide (RGO) nanosheets by a Platanus orientalis leaf extract polyphenol-mediated deoxygenation of graphene oxide (GO). Microscopic and spectroscopic characterization revealed the successful deoxygenation of GO and subsequent stabilization by oxidized polyphenols of plant extract. X-ray photoelectron spectroscopy, Raman spectroscopy, and X-ray diffraction analyses were used to examine the reduction of GO. Fourier-transform infrared spectroscopy results revealed capping of RGO with oxidized polyphenols of Platanus orientalis extract, which prevented aggregation of graphene sheets...
October 3, 2016: Environmental Toxicology and Pharmacology
Lei Zhou, Shenhui Li, Guodong Qi, Yongchao Su, Jing Li, Anmin Zheng, Xianfeng Yi, Qiang Wang, Feng Deng
The carbonylation of methanol with carbon monoxide to generate methyl acetate over Cu-H-MOR and H-MOR zeolites is studied using solid-state NMR spectroscopy. It is found that the catalytic activity of Cu-H-MOR zeolite is much higher than that of H-MOR zeolite. The presence of Cu(+) species enables the stabilization of dimethyl ether, which efficiently suppresses the hydrocarbon formation during carbonylation process over Cu-H-MOR zeolite. In addition, the carbon monoxide adsorbed on Cu(+) site is not an active species to produce either methyl acetate or acetic acid...
October 6, 2016: Solid State Nuclear Magnetic Resonance
Hiroko Kubo, Masahito Nakataki, Satsuki Sumitani, Jun-Ichi Iga, Shusuke Numata, Naomi Kameoka, Shin-Ya Watanabe, Hidehiro Umehara, Makoto Kinoshita, Masatoshi Inoshita, Mai Tamaru, Masashi Ohta, Chiaki Nakayama-Yamauchi, Yasuhiro Funakoshi, Masafumi Harada, Tetsuro Ohmori
BACKGROUND: Previous studies of patients with bipolar disorder (BD) using magnetic resonance spectroscopy (MRS) have shown neurophysiological abnormalities related to the glutamate (Glu)-glutamine (Gln) cycle, membrane turnover, and neuronal integrity, although the results were neither consistent nor conclusive. Recently it has been reported the Gln/Glu ratio is the most useful index, quantifying neuronal-glial interactions and the balance of glutamatergic metabolites In this MRS study, we elucidated the abnormalities of metabolites in a larger sample of patients with BD with a high-field MRI system...
October 8, 2016: Journal of Affective Disorders
Bruno Fernandes, Teresa Matamá, Diana Guimarães, Andreia Gomes, Artur Cavaco-Paulo
Melanin quantification is reportedly performed by absorption spectroscopy, commonly at 405 nm. Here, we propose the implementation of fluorescence spectroscopy for melanin assessment. In a typical in vitro assay to assess melanin production in response to an external stimulus, absorption spectroscopy clearly overvalues melanin content. This method is also incapable of distinguishing non-melanotic/amelanotic control cells from those that are actually capable of performing melanogenesis. Therefore, fluorescence spectroscopy is the best method for melanin quantification as it proved to be highly specific and accurate, detecting even small variations in the synthesis of melanin...
October 22, 2016: Pigment Cell & Melanoma Research
Tao Ye, Xi Jiang, Dongyang Wan, Xingzhi Wang, Jun Xing, Thirumalai Venkatesan, Qihua Xiong, Seeram Ramakrishna
Aligned and flexible electrospun carbon nanomaterials are used to synthesize novel carbon perovskite nanocomposite for the first time. The free electron diffusion length in CH3NH3PbI3 phase of the CH3NH3PbI3/carbon nanocomposite is observed to almost double that of bare CH3NH3PbI3 and nearly 95% of the photogenerated free holes can inject from CH3NH3PbI3 phase to the carbon nanomaterials. Furthermore, the exciton binding energy in the composite is estimated to be ~23 meV by utilizing temperature dependent optical absorption spectroscopy...
October 22, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Nicole Groh, Christian Seutter von Loetzen, Brinda Subbarayal, Christian Möbs, Lothar Vogel, Andreas Hoffmann, Kay Fötisch, Anna Koutsouridou, Stefanie Randow, Elke Völker, Andreas Reuter, Paul Rösch, Stefan Vieths, Wolfgang Pfützner, Barbara Bohle, Dirk Schiller
BACKGROUND: Allergen-specific immunotherapy (AIT) with birch pollen generates Bet v 1-specific immunoglobulin (Ig)G4 which blocks IgE-mediated hypersensitivity mechanisms. Whether IgG4 specific for Bet v1a competes with IgE for identical epitopes or whether novel epitope specificities of IgG4 antibodies are developed is under debate. OBJECTIVE: We sought to analyze the epitope specificities of IgE and IgG4 antibodies from sera of patients who received AIT. METHODS: 15 sera of patients (13/15 received AIT) with Bet v 1a-specific IgE and IgG4 were analyzed...
October 22, 2016: Clinical and Experimental Allergy: Journal of the British Society for Allergy and Clinical Immunology
Xinmin Li, Yingkai Liu, Shuanghui Li, Jieqing Huang, Yuemei Wu, Dapeng Yu
Pure SnO2 and Y-doped SnO2 nanobelts were prepared by thermal evaporation at 1350 °C in the presence of Ar carrier gas (30 sccm). The samples were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), energy dispersion spectrometer (EDS), X-ray photoelectron spectrometer (XPS), UV-Vis absorption spectroscopy, Raman spectroscopy, and Fourier transform infrared spectrum (FTIR). The sensing properties of the devices based on a single SnO2 nanobelt and Y-doped SnO2 nanobelt were explored to acetone, ethanol, and ethanediol...
December 2016: Nanoscale Research Letters
Narendra Kumar, Vijay Kumar, Rohit Panwar, Chand Ram
The toxic heavy metal cadmium (Cd) appears as one of the major global threats to human and animal health. Human being and aquatic life are exposed to Cd by breathing, eating, or drinking when industrial effluents released into environment. The study was aimed to identify cadmium-binding Lactobacillus strain to reduce its bioaccessibility in in vitro digestion model. In this context, forty-eight lactobacilli strains isolated and characterized from fermented dairy products and human origin were screened for their Cd biosorption potential using Flame Atomic Absorption Spectroscopy (FAAS)...
October 21, 2016: Environmental Science and Pollution Research International
Eva F G Naninck, J Efraim Oosterink, Kit-Yi Yam, Lennart P de Vries, Henk Schierbeek, Johannes B van Goudoever, Rikst-Nynke Verkaik-Schakel, Josèe A Plantinga, Torsten Plosch, Paul J Lucassen, Aniko Korosi
Early-life stress (ES) impairs cognition later in life. Because ES prevention is problematic, intervention is needed, yet the mechanisms that underlie ES remain largely unknown. So far, the role of early nutrition in brain programming has been largely ignored. Here, we demonstrate that essential 1-carbon metabolism-associated micronutrients (1-CMAMs; i.e., methionine and B vitamins) early in life are crucial in programming later cognition by ES. ES was induced in male C57Bl/6 mice from postnatal d (P)2-9. 1-CMAM levels were measured centrally and peripherally by using liquid chromatography-mass spectroscopy...
October 21, 2016: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
Adenike Okunlola, Amusa Sarafadeen Adebayo, Moji Christianah Adeyeye
Tropical starches from Dioscorea dumetorum (bitter) and Dioscorea oppositifolia (Chinese) yams were acetylated with acetic anhydride in pyridine medium and utilized as polymers for the delivery of repaglinide in microsphere formulations in comparison to ethyl cellulose. Acetylated starches of bitter and Chinese yams with degrees of substitution of 2.56 and 2.70 respectively were obtained. Acetylation was confirmed by FTIR, (1)H NMR spectroscopy. A 3(2) factorial experimental design was performed using polymer type and drug-polymer ratio as independent variables...
October 18, 2016: International Journal of Biological Macromolecules
Ye Xinguo, Sheng Li, Xuanxuan Chen, Yingfei Zhan, Xiaonan Li
Scaffolds with good three-dimensional (3D) structure and appropriate surface modification are essential to tissue regeneration in the treatment of tissue or organ failure. Silk fibroin (SF) is a promising scaffolding material with high biocompatibility, cytocompatibility, biodegradability and flexibility. In this study, positively charged polyethylenimine (PEI) and negatively charged SF assembled alternately onto cellulose nanofibrous substrates hydrolyzed from electrospun cellulose acetate nanofibrous mats...
October 18, 2016: International Journal of Biological Macromolecules
Mansoore Hosseini-Koupaei, Behzad Shareghi, Ali Akbar Saboury, Fateme Davar
The alteration in structure, function and stability of proteinase K in the presence of spermine was investigated using spectroscopic methods and simulation techniques. The stability and enzyme activity of proteinase K-spermine complex were significantly enhanced as compared to that of the pure enzyme. The increase in the value of Vmax and the catalytic efficiency of Proteinase K in presence of spermine confirmed that the polyamine could bring the enzyme hyperactivation. UV-visible spectroscopy, intrinsic fluorescence and circular dichroism methods demonstrated that the binding of spermine changed the microenvironment and structure of proteinase K...
October 18, 2016: International Journal of Biological Macromolecules
Zhejun Wang, Hazuki Maezono, Ya Shen, Markus Haapasalo
INTRODUCTION: The purpose of this study was to examine the level of erosion in root dentin caused by different irrigation methods and protocols. METHODS: Thirty-five extracted upper molar teeth were instrumented and divided into 7 groups to undergo treatment by different methods: negative control, GentleWave System (Sonendo Inc, Laguna Hills, CA), and syringe needle irrigation following different protocols. The teeth were instrumented to size #25/.08 or #30/.09 for needle irrigation groups and to ProTaper size S1 for the GentleWave group under 5% sodium hypochlorite (NaOCl)...
October 18, 2016: Journal of Endodontics
Payam Hayati, AliReza Rezvani, Ali Morsali, Pascal Retailleau, Roberto Centore
Nanoparticles of two new 0D, lead(II) coordination supramolecular compounds, [Pb(L)2(I)2] (1) and [Pb(L)(L(/))(H2O)]·3H2O (2), (L=1,10-phenanthroline monohydrate, L(/)=2,6-pyridinedicarboxlic acid), have been synthesized by a sonochemical process and characterized by scanning electron microscopy (SEM), field emission scanning electron microscopy (FE-SEM), X-ray powder diffraction (XRPD), FT-IR spectroscopy and elemental analyses. The single crystal X-ray data of compounds show that the Pb ion is six coordinated in both 1 and 2...
September 7, 2016: Ultrasonics Sonochemistry
Ya-Chu Chang, Yu-Syuan Lin, Guan-Ting Xiao, Tai-Chia Chiu, Cho-Chun Hu
A turn-off fluorescence sensor synthesized by combining copper (II) oxide and multiwall carbon nanotubes (MWCNTs) were used for measuring glyphosate based on the inhibiting the catalytic activity of the CuO/MWCNTs. This sensor was synthesized by precipitating copper ions onto the acidic MWCNTs under basic conditions; the resulting material was characterized by the transmission electron microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy to confirm its structure. The CuO/MWCNTs nanomaterial was found to exhibit high peroxidase-like catalytic activity toward the reduction of H2O2 to H2O and the oxidation of Amplex Red to resorufin, with a corresponding color change from pink to red and the fluorescence enhancement...
December 1, 2016: Talanta
Huichao Li, Lu Wang, Kai Sheng, Lina Zou, Baoxian Ye
The nanocomposites of titanium dioxide nanoparticles decorated poly(diallyldimethylammonium chloride)-functionalized graphene (TiO2-PDDA-Gr) were successfully synthesized via a facile and green strategy. The prepared nanocomposites were characterized by X-ray diffraction (XRD), UV-visible spectrophotometry (UV-vis), Fourier Transform infrared spectroscopy (FT-IR) and transmission electron microscopy (TEM). By combining the merits of the PDDA-Gr and TiO2 NPs, a highly sensitive electrochemical sensor was erected to detect esculetin based on the TiO2-PDDA-Gr nanocomposites...
December 1, 2016: Talanta
Cristina Márquez, M Isabel López, Itziar Ruisánchez, M Pilar Callao
Two data fusion strategies (high- and mid-level) combined with a multivariate classification approach (Soft Independent Modelling of Class Analogy, SIMCA) have been applied to take advantage of the synergistic effect of the information obtained from two spectroscopic techniques: FT-Raman and NIR. Mid-level data fusion consists of merging some of the previous selected variables from the spectra obtained from each spectroscopic technique and then applying the classification technique. High-level data fusion combines the SIMCA classification results obtained individually from each spectroscopic technique...
December 1, 2016: Talanta
Bilal Demir, Tulay Yilmaz, Emine Guler, Z Pinar Gumus, Huseyin Akbulut, Ebru Aldemir, Hakan Coskunol, Demet Goen Colak, Ioan Cianga, Shuhei Yamada, Suna Timur, Takeshi Endo, Yusuf Yagci
Affinity-type sensors have emerged as outstanding platforms in the detection of diagnostic protein markers, nucleic acids and drugs. Thus, these novel platforms containing antibodies could be integrated into the monitoring systems for abused drugs. Herein, we established a novel detection platform for the analysis of a common illicit drug; methamphetamine (METH). Initially, a fluorescent-labeled polypeptide (EDOT-BTDA-Pala), derived from L-alanine N-carboxyanhydride (L-Ala-NCA) via ring-opening polymerization using 4,7-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)benzo[c][1,2,5]thiadiazole-5,6-diamine (EDOT-NH2-BTDA) as initiator, was employed as a glassy carbon electrode (GCE) covering host, in order to immobilize the METH-selective antibody...
December 1, 2016: Talanta
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