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Xinfeng Zhang, Shujing Yang, Bing Yu, Qinglong Tan, Xiaoyan Zhang, Hailin Cong
Advanced modified polyacrylonitrile (PAN) membrane with high adsorption property for heavy metal ions was designed and fabricated for the first time. The introduced diazoresin-ethylenediaminetetraacetic acid (DR-EDTA) layer could effectively absorb the metal ion, such as Cu2+, Pb2+, Hg2+ in the waste water. The effects of layers, metal ion concentration, pH, temperature and cycle time were investigated. The results showed that the adsorption isotherms for Cu2+ were well fitted by Langmuir model. The maximum adsorption capacity of the modified membrane for Cu2+ was approximately 47...
January 19, 2018: Scientific Reports
J De Roos, M Verce, M Aerts, P Vandamme, L De Vuyst
Few data have been published on the occurrence and functional role of acetic acid bacteria (AAB) in lambic beer production processes, mainly due to their difficult recovery and possibly unknown role. Therefore, a novel aseptic sampling method, spanning both the spatial and temporal distribution of AAB and their substrates and metabolites, was combined with a highly selective medium and matrix-assisted laser desorption time-of-flight mass spectrometry (MALDI TOF MS) as a high-throughput dereplication method followed by comparative gene sequencing for their isolation and identification, respectively...
January 19, 2018: Applied and Environmental Microbiology
Mamiyo Kawakami, Narinobu Juge, Yuri Kato, Hiroshi Omote, Yoshinori Moriyama, Takaaki Miyaji
Structural analysis of purified active membrane proteins can be performed by mass spectrometry (MS). However, no large-scale expression systems for active eukaryotic membrane proteins are available. Moreover, because membrane proteins cannot easily be digested by trypsin and ionized, they are difficult to analyze by MS. Here, we developed a method for mass spectral analysis of eukaryotic membrane proteins combined to an overexpression system in Escherichia coli. Vesicular glutamate transporter 2 (VGLUT2/SLC17A6) with a soluble α-helical protein and histidine tag on the N- and C-terminus, respectively, was overexpressed in E...
January 19, 2018: Journal of Proteome Research
Marvin Villacrez, Karin Hellman, Tatsuya Ono, Yutaka Sugihara, Melinda Rezeli, Fredrik Ek, Gyorgy Marko-Varga, Roger Olsson
Studying how and where drugs are metabolized in the brain is challenging. In an entire organism, peripheral metabolism produces many of the same metabolites as those in the brain, and many of these metabolites can cross the blood-brain barrier from the periphery, thus making the relative contributions of hepatic and brain metabolism difficult to study in vivo. In addition, drugs and metabolites contained in ventricles and in the residual blood of capillaries in the brain may overestimate drugs' and metabolites' concentrations in the brain...
January 19, 2018: ACS Chemical Neuroscience
Sachio Tsuchida, Mamoru Satoh, Hiroshi Umemura, Kazuyuki Sogawa, Masaki Takiwaki, Takayuki Ishige, Yui Miyabayashi, Yuuya Iwasawa, Sohei Kobayashi, Minako Beppu, Motoi Nishimura, Yoshio Kodera, Kazuyuki Matsushita, Fumio Nomura
PURPOSE: Human serum and plasma are often used as clinical specimens in proteomics analyses, and peptidome profiling of human serum is a promising tool for identifying novel disease-associated biomarkers. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) is widely used for peptidomic biomarker discovery. Careful sample collection and handling are required as either can have a profound impact on serum peptidome patterns, yet the effects of preanalytical variables on serum peptidome profiles have not been completely elucidated...
January 19, 2018: Proteomics. Clinical Applications
Ling Ling, Ying Li, Sheng Wang, Liming Guo, Chunsheng Xiao, Xuesi Chen, Xinhua Guo
Matrix interference ions in low mass range has always been a concern when using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) to analyze small molecules (<500 Da). In this work, a novel matrix, N1,N4-dibenzylidenebenzene-1,4-diamine (DBDA) was synthesized for the analyses of small molecules by negative ion MALDI-TOF MS. Notably, only neat ions ([M-H]-) of fatty acids without matrix interference appeared in the mass spectra and the limit of detection (LOD) reached 0...
January 18, 2018: Journal of the American Society for Mass Spectrometry
Xunyue Liu, Huiming Wu, Tingting Hu, Xia Chen, Xingcheng Ding
Pyraoxystrobin, (E)-2-(2-((3-(4-chlorophenyl)-1-methyl-1H-pyrazole-5-yloxy)methyl)phenyl)-3-methoxyacrylate, is a newly developed strobilurin fungicide with high antifungal efficiency. It has high potential to enter soil environments that might subsequently impact surface and groundwater. Therefore, 14C-labeled pyraoxystrobin was used as a tracer to study the adsorption/desorption and migration behavior of this compound under laboratory conditions in three typical agricultural soils. The adsorption isotherms conformed with the Freundlich equation...
January 19, 2018: Environmental Monitoring and Assessment
Sally C Y Wong, Siddharth Sridhar, Antonio H Y Ngan, Jonathan H K Chen, Rosana W S Poon, Susanna K P Lau, Patrick C Y Woo
Talaromyces marneffei, previously known as Penicillium marneffei, is the most important pathogenic thermally dimorphic fungus causing systemic mycosis in Southeast Asia. Traditionally, T. marneffei infection in human was mainly associated with acquired immunodeficiency syndrome caused by HIV infection. In recent years, there has been an increasing number of T. marneffei infections reported in non-HIV-infected patients with other immunocompromised conditions, including autoantibodies against interferon-gamma, systemic lupus erythematosis, solid organ transplantation, Job's syndrome, hematological malignancies, and use of novel targeted therapies...
January 18, 2018: Mycopathologia
M T Alou, S Ndongo, L Frégère, N Labas, C Andrieu, M Richez, C Couderc, J-P Baudoin, J Abrahão, S Brah, A Diallo, C Sokhna, N Cassir, B La Scola, F Cadoret, D Raoult
Culturomics investigates microbial diversity of the human microbiome by combining diversified culture conditions, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry and 16S rRNA gene identification. The present study allowed identification of four putative new Clostridium sensu stricto species: 'Clostridium amazonitimonense' strain LF2T, 'Clostridium massilidielmoense' strain MT26T, 'Clostridium nigeriense' strain Marseille-P2414T and 'Clostridium merdae' strain Marseille-P2953T, which we describe using the concept of taxonogenomics...
January 2018: New Microbes and New Infections
Abdul-Hossein Almirtaha, Mohammad Eftekhari, Mahmoud Chamsaz, Mohammad Gheibi
In this paper, menthe pulegium leaves extract was used as a green reducing agent for synthesis of silver-nanoparticles from silver ion solution. The synthesized silver nanoparticles were characterized by ultraviolet-visible spectrophotometry, transmission electron microscopy, X-Ray spectroscopy and used as adsorbent in solid phase extraction for preconcentration of trace levels of cadmium (ІІ). After desorption of cadmium (ІІ) in 5 mol L-1 formic acid, the desorbent solution was aspirated into the flame atomic absorption spectrometry for determination of cadmium...
January 18, 2018: Environmental Technology
Shaghayegh Darjani, Joel Koplik, Vincent Pauchard
An alternative approach for deriving the equation of state for a two-dimensional lattice gas is proposed, based on arguments similar to those used in the derivation of the Langmuir-Szyszkowski equation of state for localized adsorption. The relationship between surface coverage and excluded area is first extracted from random sequential adsorption simulations incorporating surface diffusion (RSAD). The adsorption isotherm is then obtained using kinetic arguments, and the Gibbs equation gives the relation between surface pressure and coverage...
November 2017: Physical Review. E
Guillaume Dumazer, Eirik Flekkøy, François Renard, Luiza Angheluta
A solvable, minimal model of diffusion in the presence of a reversible adsorption site is investigated. We show that the diffusive particles are influenced by the adsorbing site on transient times when they have anomalous subdiffusive behavior. However, the particle dispersion law crosses over to the normal diffusive regime on asymptotically long times. The subdiffusive regime is characterized by a t^{1/4} transient scaling with the same exponent as for the irreversible adsorption. On this transient time scale dominated by particle adsorption, there is a depletion of particles near the adsorbing site, and the typical width of the depletion zone grows in time as t^{1/4} with the same exponent as the subdiffusive dispersion...
October 2017: Physical Review. E
Sabrina Simoncelli, Yi Li, Emiliano Cortes, Stefan A Maier
Self-assembly processes allow designing and creating complex nanostructures using molecules as building blocks and surfaces as scaffolds. This autonomous driven construction is possible due to a complex thermodynamic balance of molecule-surface interactions. As such, nanoscale guidance and control over this process is hard to achieve. Here we use the highly localized light-to-chemical-energy conversion of plasmonic materials to spatially cleave Au-S bonds on pre-determined locations within a single nanoparticle, enabling a high degree of control over this archetypal system for molecular self-assembly...
January 18, 2018: ACS Nano
Yalan Feng, Beibei Kong, Jun Zhang, Xianni Chen, Jiale Yuan, Xingwang Tang, Chao Ma
Vernalization is one of the pivotal ways for plants to flower. As one of the major cereal crops, wheat is widely planted in the world. In the present study, we applied two-dimensional gel electrophoresis (2-DE) and matrix-assisted laser desorption/ionization time-of-flight/time-of-flight mass spectrometry (MALDI-TOF/TOF MS) to analyze the changes in protein expression profiles in responding to vernalization in leaves of wheat seedling before (0d) and after (30d) of vernalization. The results indicated that among the 68 differentially expressed proteins that were successfully identified under vernalization, 36 were up-regulated whereas 32 were down-regulated at 0 d, respectively...
January 17, 2018: Protein and Peptide Letters
Le Zhang, Peng Fei Liu, Yu Hang Li, Meng Yang Zu, Xu Li, Zheng Jiang, Yun Wang, Huijun Zhao, Huagui Yang
Boosting the sluggish kinetics of hydrogen evolution reaction in alkaline environments is the key for large application of water-alkali and chlor-alkali electrolysis. Herein, for the first time, we use nitrogen atoms to precisely modulate electrochemical active sites on the surface of nickel oxide with low coordinated oxygen atoms, to achieve enhanced kinetics of alkaline hydrogen evolution. Theoretical and experimental results demonstrate that the surface charge redistribution after modulation simultaneously facilitates the initial water dissociation step, as well as the subsequent recombination of Had from low coordinated oxygen sites and desorption of OH-ad from nickel sites, thus accelerating the overall hydrogen evolution process...
January 18, 2018: ChemSusChem
Hoon Suk Rho, Alexander Thomas Hanke, Marcel Ottens, Han Gardeniers
A microfluidic device for pH gradient chromatofocusing is presented, which performs creation of a micro-column, pH gradient generation, and fraction collection in a single device. Using a sieve micro-valve, anion exchange particles were packed into a microchannel in order to realize a solid-phase absorption column. To fractionate proteins according to their isoelectric points, elution buffer solutions with a stepwise pH gradient were prepared in 16 parallel mixing reactors and flowed through the micro-column, wherein a protein mixture was previously loaded...
January 18, 2018: Electrophoresis
Qianqian Du, Jiandong Ye, Zhonghua Xu, Shunming Zhu, Kun Tang, Shulin Gu, Youdou Zheng
Recently, ZnO nanowire field effect transistors (FETs) have received renewed interest due to their extraordinary low dimensionality and high sensitivity to external chemical environment and illumination conditions. These prominent properties have the promising potential in the nanoscale chemical and photo-sensors. In this article, we have fabricated ZnO nanowire FETs and have found hysteresis behaviors in their transfer characteristics. The mechanism and dynamics of the hysteresis phenomena have been investigated in detail by varying the sweeping rate and range of the gate bias with and without light irradiation...
January 18, 2018: Nanotechnology
Ruslan Zotov, Eugene Meshcheryakov, Alesia Livanova, Tamara Minakova, Oleg Magaev, Lyubov Isupova, Irina Kurzina
Interaction between the water adsorption ability of aluminium-oxide-based sorbents and their chemical composition, acid-base properties of the surface, and textural characteristics has been analysed. Alumina desiccants were synthesized with the centrifugal-thermal activation of gibbsite followed by the hydration of the gibbsite under mild conditions. It was demonstrated that the multicyclic adsorption regeneration of samples under realistic conditions results in structural transformations and changes in the acidity of their surfaces and water adsorption ability...
January 14, 2018: Materials
Xuemei Wang, Pengfei Huang, Xiaomin Ma, Xinzhen Du, Xiaoquan Lu
Novel magnetic mesoporous molecularly imprinted polymers (MMIPs) were prepared based on surface precipitation polymerization using Triclosan (TCS) as template and methacrylic acid as functional monomer. The synthesized MMIPs-TCS were applied to the adsorbent of magnetic solid-phase extraction (MSPE) coupled with HPLC for the enrichment and determination of TCS. The MMIPs-TCS were characterized by fourier-transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption transmission, and vibrating sample magnetometry...
January 10, 2018: Journal of Chromatography. A
Zongfang Wu, Agata Płucienik, Felix E Feiten, Matthias Naschitzki, Walter Wachsmann, Sandy Gewinner, Wieland Schöllkopf, Volker Staemmler, Helmut Kuhlenbeck, Hans-Joachim Freund
Vibrational action spectroscopy employing infrared radiation from a free-electron laser has been successfully used for many years to study the vibrational and structural properties of gas phase aggregates. Despite the high sensitivity of this method no relevant studies have yet been conducted for solid sample surfaces. We have set up an experiment for the application of this method to such targets, using infrared light from the free-electron laser of the Fritz Haber Institute. In this Letter, we present first results of this technique with adsorbed argon and neon atoms as messengers...
September 29, 2017: Physical Review Letters
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