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https://www.readbyqxmd.com/read/28448907/characterization-of-typical-metal-particles-during-haze-episodes-in-shanghai-china
#1
Rui Li, Xin Yang, Hongbo Fu, Qingqing Hu, Liwu Zhang, Jianmin Chen
Aerosol particles were collected during three heavy haze episodes at Shanghai in the winter of 2013. Transmission electron microscopy (TEM) coupled with energy dispersive X-ray spectroscopy was used to study the morphology and speciation of typical metal particles at a single-particle level. In addition, time-of-flight aerosol mass spectrometry (ATOFMS) was applied to identify the speciation of the Fe-containing particles. TEM analysis indicated that various metal-containing particles were hosted by sulfates, nitrates, and oxides...
April 19, 2017: Chemosphere
https://www.readbyqxmd.com/read/28448690/evaluation-of-column-length-and-particle-size-effect-on-the-untargeted-profiling-of-a-phytochemical-mixture-by-using-uhplc-coupled-to-high-resolution-mass-spectrometry
#2
Riccardo Zenezini Chiozzi, Anna Laura Capriotti, Chiara Cavaliere, Francesca Ferraris, Giorgia La Barbera, Susy Piovesana, Aldo Laganà
Liquid chromatography coupled to high-resolution mass spectrometry is the technique of choice for the untargeted profiling of food matrices. Despite the high potential of high-resolution mass spectrometry, when dealing with complex mixtures, an efficient separation technique is also needed. The novel core-shell chromatographic columns packed with sub-2 μm sized particles are claimed to show very good resolution. However, the analytes retention can be significantly altered when working under ultra-high performance chromatographic conditions...
April 27, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28448005/open-source-single-particle-analysis-for-super-resolution-microscopy-with-virusmapper
#3
Robert D M Gray, Jason Mercer, Ricardo Henriques
Super-resolution fluorescence microscopy is currently revolutionizing cell biology research. Its capacity to break the resolution limit of around 300 nm allows for the routine imaging of nanoscale biological complexes and processes. This increase in resolution also means that methods popular in electron microscopy, such as single-particle analysis, can readily be applied to super-resolution fluorescence microscopy. By combining this analytical approach with super-resolution optical imaging, it becomes possible to take advantage of the molecule-specific labeling capacity of fluorescence microscopy to generate structural maps of molecular elements within a metastable structure...
April 9, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28447452/a-single-usage-of-a-kitchen-degreaser-can-alter-indoor-aerosol-composition-for-days
#4
Jaroslav Schwarz, Otakar Makeš, Jakub Ondráček, Michael Cusack, Nicholas Talbot, Petr Vodička, Lucie Kubelova, Vladimir Zdimal
To the best of our knowledge, this study represents the first observation of multi-day persistence of an indoor aerosol transformation linked to a kitchen degreaser containing mono-ethanol amine (MEA). MEA remaining on the cleaned surfaces and on a wiping paper towel in a trash can was able to transform ammonium sulfate and ammonium nitrate into (MEA)2SO4 and (MEA)NO3. This influence persisted for at least 60 hours despite a high average ventilation rate. The influence was observed using both offline (filters, impactors, and ion chromatography analysis) and online (compact time-of-flight aerosol mass spectrometer) techniques...
April 27, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28446033/controls-over-spatial-and-seasonal-variations-on-isotopic-composition-of-the-precipitation-along-the-central-and-eastern-portion-of-brazil
#5
Didier Gastmans, Vinícius Santos, Juliana Aparecida Galhardi, João Felipe Gromboni, Ludmila Vianna Batista, Konrad Miotlinski, Hung Kiang Chang, José Silvio Govone
Based on Global Network Isotopes in Precipitation (GNIP) isotopic data set, a review of the spatial and temporal variability of δ(18)O and δ(2)H in precipitation was conducted throughout central and eastern Brazil, indicating that dynamic interactions between Intertropical and South Atlantic Convergence Zones, Amazon rainforest, and Atlantic Ocean determine the variations on the isotopic composition of precipitation over this area. Despite the seasonality and latitude effects observed, a fair correlation with precipitation amount was found...
April 26, 2017: Isotopes in Environmental and Health Studies
https://www.readbyqxmd.com/read/28443862/a-small-bandgap-semiconductor-p-type-mnv2o6-active-for-photocatalytic-hydrogen-and-oxygen-production
#6
Brandon Zoellner, Elijah Gordon, Paul A Maggard
Extensive research has been conducted with the goal to find a single bandgap material that can absorb visible light and efficiently drive the catalysis of water to both hydrogen and oxygen. The p-type MnV2O6 (C2/m, Z = 2, a = 9.289 Å, b = 3.535 Å, and c = 6.763 Å, β = 112.64°), synthesized via solid-state techniques, was investigated for its potential use in the visible-light photocatalysis of water. Mott-Schottky analysis was used to experimentally determine the energetic positions of the valence and conduction bands as +0...
April 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28440581/the-toxicity-of-silver-to-soil-organisms-exposed-to-silver-nanoparticles-and-silver-nitrate-in-biosolids-amended-field-soil
#7
Alexander H Jesmer, Jessica R Velicogna, Dina M Schwertfeger, Richard P Scroggins, Juliska I Princz
The use of engineered silver nanoparticles (AgNP) is widespread, with expected release to the terrestrial environment through the application of biosolids onto agricultural lands. The toxicity of AgNP and AgNO3 (as ionic Ag(+) ) to plant (Elymus lanceolatus and Trifolium pratense) and soil invertebrate (Eisenia andrei and Folsomia candida) species was assessed using silver-amended biosolids applied to a natural sandy loam soil. Bioavailable Ag(+) in soil samples was estimated using an ion-exchange technique applied to KNO3 soil extracts while exposure to dispersible AgNP was verified by single particle-ICP-MS and TEM-EDS analysis...
April 25, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28437650/indoor-to-outdoor-relationship-of-aerosol-particles-inside-a-naturally-ventilated-apartment-a-comparison-between-single-parameter-analysis-and-indoor-aerosol-model-simulation
#8
Tareq Hussein
The indoor-to-outdoor relationship of aerosol particles is affected by several mechanisms including penetration, ventilation rate, dry deposition rate and sources. Understanding the effect of these factors is essential for a deeper knowledge of the indoor-to-outdoor relationship. In real-life conditions, it is difficult to analyze these factors in a naturally ventilated environment. In this study, a naturally ventilated and an occupied apartment was used to investigate the indoor-to-outdoor relationship of aerosol particles by applying two different techniques; single-parameter analysis and indoor aerosol model simulation...
April 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28437606/transfer-study-of-silver-nanoparticles-in-poultry-production
#9
Federica Gallocchio, Giancarlo Biancotto, Veronica Cibin, Carmen Losasso, Simone Belluco, Ruud Peters, Greet van Bemmel, Claudia Cascio, Stefan Weigel, Peter Tromp, Federica Gobbo, Salvatore Catania, Antonia Ricci
Silver nanoparticles (AgNPs) are of interest due to their antimicrobial activity and are seen as potential candidates to replace antibiotics in animal husbandry. A few studies have focused on this new application, but they lack any considerations about residual accumulation of AgNPs in edible animal tissues and animal products. In this research, a 22 day in vivo study was carried out by oral administration of 20 nm spherical PVP coated AgNPs to hens. Six doses of approximately 1 mg kg(-1) of AgNPs-PVP each were administered to animals throughout the experimentation...
April 27, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28434099/the-complete-genome-sequence-of-a-novel-virus-bellflower-veinal-mottle-virus-suggests-the-existence-of-a-new-genus-within-the-family-potyviridae
#10
Jang-Kyun Seo, Hae-Ryun Kwak, Mi-Kyeong Kim, Jeong-Soo Kim, Hong-Soo Choi
A new virus was isolated from a bellflower (Campanula takesimana) plant showing veinal mottle symptoms, and its complete genome sequence was determined. The viral genome consists of a positive-sense single-stranded RNA of 8,259 ribonucleotides. Electron microscopic observation revealed that the viral genome is packaged as a filamentous particle with an average length of approximately 760 nm. BLAST searches of protein databases showed that the encoded polyprotein has a maximum amino acid sequence identity of 34...
April 22, 2017: Archives of Virology
https://www.readbyqxmd.com/read/28427648/sonochemical-synthesis-characterization-and-effects-of-temperature-power-ultrasound-and-reaction-time-on-the-morphological-properties-of-two-new-nanostructured-mercury-ii-coordination-supramolecule-compounds
#11
Payam Hayati, Ali Reza Rezvani, Ali Morsali, Daniel Ruiz Molina, Samira Geravand, Salvio Suarez-Garcia, Miguel Angel Moreno Villaecija, S García-Granda, Rafael Mendoza-Meroño, Pascal Retailleau
Two new mercury(II) coordination supramolecular compounds (CSCs) (1D and 0D), [Hg(L)(I)2]n (1) and [Hg2(L')2(SCN)2]·2H2O (2) (L=2-amino-4-methylpyridine and L'=2,6-pyridinedicarboxlic acid), have been synthesized under different experimental conditions. Micrometric crystals (bulk) or nano-sized materials have been obtained depending on using the branch tube method or sonochemical irradiation. All materials have been characterized by field emission scanning electron microscope (FESEM), scanning electron microscopy (SEM), powder X-ray diffraction (PXRD) and FT-IR spectroscopy...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28424589/the-calcium-channel-c-terminal-and-synaptic-vesicle-tethering-analysis-by-immuno-nanogold-localization
#12
Robert H C Chen, Qi Li, Christine A Snidal, Sabiha R Gardezi, Elise F Stanley
At chemical synapses the incoming action potential triggers the influx of Ca(2+) through voltage-sensitive calcium channels (CaVs, typically CaV2.1 and 2.2) and the ions binds to sensors associated with docked, transmitter filled synaptic vesicles (SVs), triggering their fusion and discharge. The CaVs and docked SVs are located within the active zone (AZ) region of the synapse which faces a corresponding neurotransmitter receptor-rich region on the post-synaptic cell. Evidence that the fusion of a SV can be gated by Ca(2+) influx through a single CaV suggests that the channel and docked vesicle are linked by one or more molecular tethers (Stanley, 1993)...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28423226/rvx-208-a-novel-bet-protein-inhibitor-role-as-an-inducer-of-apo-a-i-hdl-and-beyond
#13
Gopal C Ghosh, Rajarshi Bhadra, Raktim K Ghosh, Kinjal Banerjee, Anjan Gupta
Low density cholesterol (LDL) has been the prime target of currently available lipid-lowering therapies although current research is expanding the focus beyond LDL lowering and has included high density cholesterol (HDL) also as the target. Bromo and extra-terminal (BET) proteins are implicated in the regulation of transcription of several regulatory genes and regulation of pro-inflammatory pathways. As atherosclerosis is an inflammatory pathway and studies showed that BET inhibition has a role in inhibiting inflammation, the concept of BET inhibition came in the field of atherosclerosis...
April 19, 2017: Cardiovascular Therapeutics
https://www.readbyqxmd.com/read/28423032/complete-study-demonstrating-the-absence-of-rhabdovirus-in-a-distinct-sf9-cell-line
#14
Yoshifumi Hashimoto, Daniel Macri, Indresh Srivastava, Clifton McPherson, Rachael Felberbaum, Penny Post, Manon Cox
A putative novel rhabdovirus (SfRV) was previously identified in a Spodoptera frugiperda cell line (Sf9 cells [ATCC CRL-1711 lot 58078522]) by next generation sequencing and extensive bioinformatic analysis. We performed an extensive analysis of our Sf9 cell bank (ATCC CRL-1711 lot 5814 [Sf9L5814]) to determine whether this virus was already present in cells obtained from ATCC in 1987. Inverse PCR of DNA isolated from Sf9 L5814 cellular DNA revealed integration of SfRV sequences in the cellular genome. RT-PCR of total RNA showed a deletion of 320 nucleotides in the SfRV RNA that includes the transcriptional motifs for genes X and L...
2017: PloS One
https://www.readbyqxmd.com/read/28422858/350-560%C3%A2-%C3%AE-m-gelatin-sponge-particles-combined-with-transcatheter-arterial-chemoembolization-for-the-treatment-of-elderly-hepatocellular-carcinoma-the-safety-and-efficacy
#15
Guang Sheng Zhao, Chuang Li, Ying Liu, Zhi Zhong Ren, Xiao Lin Yuan, Jun Zhou, Yue Wei Zhang, Ming Zhang
To retrospectively analyze the safety and efficacy of 350-560 μm gelatin sponge particles combined with single-chemotherapy drug transcatheter arterial chemoembolization (Gs-TACE) for the treatment of elderly hepatocellular carcinoma without surgical resection.Thirty elderly hepatocellular carcinoma patients without surgical resection, who received Gs-TACE in our hospital, were selected. Slowly injected gelatin sponge particles (350-560 μm)+ 10 mg lobaplatin injection into the regional embolization tumor target vessel...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28422359/clinical-evaluation-of-indirect-particle-filled-composite-resin-cad-cam-partial-crowns-after-24-months
#16
Moritz Zimmermann, Christina Koller, Marcel Reymus, Albert Mehl, Reinhard Hickel
PURPOSE: Resin-based CAD/CAM compound materials might be promising for single-tooth restorations. Insufficient clinical data are available for this new material class. The purpose of this study was to describe initial clinical in vivo results for indirect particle-filled composite resin CAD/CAM restorations after 24 months. MATERIALS AND METHODS: Indirect particle-filled composite resin restorations were fabricated with a CAD/CAM method (CEREC Bluecam intraoral scanner, CEREC MCXL milling unit) by calibrated dental students...
April 19, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28417174/multidimensional-single-cell-analysis-based-on-fluorescence-microscopy-and-automated-image-analysis
#17
Michael Sandmann, Martin Lippold, Franziska Saalfrank, Chimezie Progress Odika, Sascha Rohn
A single-cell analytical technology was developed for evaluating fast-growing cultures of green algae. The main part of the single-cell analysis is an epifluorescence microscopy-based cytometric approach combined with an automated image analysis algorithm and a single-threshold discrimination procedure. The reliability of the technique in terms of object recognition, evaluating particle size, and determining chlorophyll was successfully proven via reference analyses. The microscopy technique was used to determine the size of single cells, the amount of chlorophyll, and the density of chlorophyll in a model algal culture (Acutodesmus o...
April 17, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28416636/p53-dynamically-directs-tfiid-assembly-on-target-gene-promoters
#18
R A Coleman, Z Qiao, S K Singh, C S Peng, M Cianfrocco, Z Zhang, A Piasecka, H Aldeborgh, G Basishvili, W L Liu
p53 is a central regulator that turns on vast gene networks to maintain cellular integrity upon various stimuli. p53 activates transcription initiation in part by aiding recruitment of TFIID to the promoter. However, the precise means by which p53 dynamically interacts with TFIID to facilitate assembly on target gene promoters remains elusive. To address this key question, we have undertaken an integrated approach involving single molecule fluorescence microscopy, single particle cryo-electron microscopy, and biochemistry...
April 17, 2017: Molecular and Cellular Biology
https://www.readbyqxmd.com/read/28415349/decorrelation-correction-for-nanoparticle-tracking-analysis-of-dilute-polydisperse-suspensions-in-bulk-flow
#19
John Hartman, Brian Kirby
Nanoparticle tracking analysis, a multiprobe single particle tracking technique, is a widely used method to quickly determine the concentration and size distribution of colloidal particle suspensions. Many popular tools remove non-Brownian components of particle motion by subtracting the ensemble-average displacement at each time step, which is termed dedrifting. Though critical for accurate size measurements, dedrifting is shown here to introduce significant biasing error and can fundamentally limit the dynamic range of particle size that can be measured for dilute heterogeneous suspensions such as biological extracellular vesicles...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28412551/a-field-experiment-to-evaluate-the-cleaning-performance-of-sewer-flushing-on-non-uniform-sediment-deposits
#20
Gashin Shahsavari, Gilles Arnaud-Fassetta, Alberto Campisano
The results of a field experiment to evaluate the scouring effect of a single flush operation in a compound-section sewer channel in Paris, France, are presented in this paper. Full monitoring of the experiment allowed identifying flush-related transport/deposition key processes playing a role on the evolution of the deposited sediments. Overall, the flush was able to scour sediments accumulated over the channel invert up to a significant distance from the gate. The analysis of the results revealed that the flush had a different impact on the various sediments present in the bed mixtures, with most of the eroded volume including sediment particles smaller than the median grain size...
April 10, 2017: Water Research
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