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Gabriel G Arantes de Carvalho, Stalin Kondaveeti, Denise F S Petri, Alexandre M Fioroto, Luiza G R Albuquerque, Pedro V Oliveira
Analytical methods for the determination of rare earth elements (REE) in natural waters by plasma spectrochemical techniques often require sample preparation procedures for analytes preconcentration as well as for removing matrix constituents, that may interfere on the analytical measurements. In the present work, calcium alginate (CA) beads were used for the first time aiming at Ce, La and Nd preconcentration from groundwater samples for further determination by inductively coupled plasma optical emission spectrometry (ICP OES)...
December 1, 2016: Talanta
Angie D Ambers, Jennifer D Churchill, Jonathan L King, Monika Stoljarova, Harrell Gill-King, Mourad Assidi, Muhammad Abu-Elmagd, Abdelbaset Buhmeida, Bruce Budowle
BACKGROUND: Although the primary objective of forensic DNA analyses of unidentified human remains is positive identification, cases involving historical or archaeological skeletal remains often lack reference samples for comparison. Massively parallel sequencing (MPS) offers an opportunity to provide biometric data in such cases, and these cases provide valuable data on the feasibility of applying MPS for characterization of modern forensic casework samples. In this study, MPS was used to characterize 140-year-old human skeletal remains discovered at a historical site in Deadwood, South Dakota, United States...
October 17, 2016: BMC Genomics
Woong Choi, Gyoo Yeol Jung
For the development of clinically useful genotyping methods for single nucleotide polymorphisms (SNPs), accuracy, simplicity, sensitivity, and cost-effectiveness are the most important criteria. Among the methods currently being developed for SNP genotyping technology, the ligation-dependent method is considered the simplest for clinical diagnosis. However, sensitivity is not guaranteed by the ligation reaction alone, and analysis of multiple targets is limited by the detection method. Although CE is an attractive alternative to error-prone hybridization-based detection, the multiplex assay process is complicated because of the size-based DNA separation principle...
October 18, 2016: Electrophoresis
Marton Szigeti, Andras Guttman
N-glycan profiling of therapeutic glycoproteins is essential to ensure the activity and efficacy of these promising new-generation drugs. The N-linked glycan moieties of these entities highly affect circulation half-life, immunogenicity and receptor-binding activity as well as physicochemical and thermal stability properties. In addition, more than half of the biopharmaceuticals are glycoproteins representing multibillion dollar worldwide business, further emphasizing the importance of their analysis. In the biomedical field, on the other hand, revealing disease-related glycan structure alterations holds the promise of the discovery of new biomarkers for early diagnostics...
2017: Methods in Molecular Biology
Julie M Muller, Shane S Galley, Thomas E Albrecht-Schmitt, Kenneth L Nash
The complexation of selected trivalent lanthanide ions with derivatives of the tetranitrogen donor ligands 6,6'-bis-1R,1H-1,2,3-triazol-4-yl-2,2'-bipyridines (BTzBPs, R = alkyl or aryl) was investigated in solid state and in solution. An anhydrous solid [Ce(Bn-BTzBP)(NO3)3] (Bn = benzene) complex was synthesized and characterized by single-crystal X-ray diffraction. Eu(III) complexes with the 2-ethyl(hexyl) derivative EH-BTzBP in methanol were studied by time-resolved fluorescence spectroscopy. Earlier studies have identified the EH-BTzBP as a potentially useful solvent extraction reagent for the separation of americium from lanthanide metal ions, a challenging component of advanced nuclear fuel cycles for actinide transmutation...
October 14, 2016: Inorganic Chemistry
Chang Yu, Zhiqiang Liu, Xiangtong Meng, Bing Lu, Dan Cui, Jieshan Qiu
Alternative high-performance electrocatalysts for triiodide (I3(-)) reduction of low-cost dye-sensitized solar cells (DSSCs) are urgently sought after. To address the concerned issues, we report a facile strategy for engineering the nitrogen and phosphorus dual-doped graphene (NPG) via an efficient ball-milling process, followed by a simple thermal annealing approach utilizing melamine (C3H6N6) and triphenylphosphine ((C6H5)3P) as the N and P source, respectively. When employed as the counter electrode (CE) in DSSCs, such a metal-free material exhibits excellent electrocatalytic activity towards the I3(-)/I(-) redox reaction...
October 14, 2016: Nanoscale
Jean-Yves Paul, Harjeet Khanna, Jennifer Kleidon, Phuong Hoang, Jason Geijskes, Jeff Daniells, Ella Zaplin, Yvonne Rosenberg, Anthony James, Bulukani Mlalazi, Pradeep Deo, Geofrey Arinaitwe, Priver Namanya, Douglas Becker, James Tindamanyire, Wilberforce Tushemereirwe, Robert Harding, James Dale
Vitamin A deficiency remains one of the world's major public health problems despite food fortification and supplements strategies. Biofortification of staple crops with enhanced levels of pro-vitamin A (PVA) offers a sustainable alternative strategy to both food fortification and supplementation. As a proof of concept, PVA-biofortified transgenic Cavendish bananas were generated and field trialed in Australia with the aim of achieving a target level of 20 μg/g of dry weight (dw) β-carotene equivalent (β-CE) in the fruit...
October 13, 2016: Plant Biotechnology Journal
Simone Marocchi, Andrea Candini, David Klar, Willem Van den Heuvel, Haibei Huang, Filippo Troiani, Valdis Corradini, Roberto Biagi, Valentina De Renzi, Svetlana Klyatskaya, Kurt Kummer, Nicholas B Brookes, Mario Ruben, Heiko Wende, Umberto Del Pennino, Alessandro Soncini, Marco Affronte, Valerio Bellini
We investigate the electronic and magnetic properties of \ce{TbPc2} single ion magnets adsorbed on a graphene/Ni(111) substrate, by density-functional theory (DFT), ab-initio complete active space self-consistent field calculations, and x-ray magnetic circular dichroism (XMCD) experiments. Despite the presence of the graphene decoupling layer a sizable antiferromagnetic coupling between Tb and Ni is observed in the XMCD experiments. The molecule-surface interaction is rationalized by the DFT analysis and is found to follow a relay-like communication pathway, where the radical spin on the organic Pc ligands mediates the interaction between Tb ion and Ni substrate spins...
October 11, 2016: ACS Nano
Jiancai Liu, Jing Yu, Qing Han, Yue Wen, Lijuan Chen, Junwei Zhao
A class of novel organic-inorganic hybrid lanthanide (Ln)-substituted Keggin-type borotungstates K4Na4H4[Ln2(gly)4(α-BW11O39)2]·23H2O [Ln = Ce(3+) (1), Pr(3+) (2), Nd(3+) (3), Sm(3+) (4), Eu(3+) (5), Tm(3+) (6); gly = glycine] have been synthesized from the reaction of K8[BW11O39H]·13H2O, NaAc·6H2O and Ln(NO3)3·6H2O by employing gly ligands as structure-stabilizing agents in the conventional aqueous solution system and structurally characterized by elemental analyses, IR spectroscopy, thermogravimetric (TG) analyses, powder X-ray diffraction (PXRD) and single-crystal X-ray diffraction...
October 18, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
P Naresh Kumar, Ankita Kolay, S Krishna Kumar, Prabir Patra, Ashish Aphale, Avanish Kumar Srivastava, Melepurath Deepa
The counter electrode (CE), despite being as relevant as the photoanode in a quantum dot solar cell (QDSC), has hardly received the scientific attention it deserves. In this study, nine CEs (single-walled carbon nanotubes (SWCNTs), tungsten oxide (WO3), poly(3,4-ethylenedioxythiophene) (PEDOT), copper sulfide (Cu2S), candle soot, functionalized multiwalled carbon nanotubes (F-MWCNTs), reduced tungsten oxide (WO3-x), carbon fabric (C-Fabric), and C-Fabric/WO3-x) were prepared by using low-cost components and facile procedures...
October 4, 2016: ACS Applied Materials & Interfaces
Xiaolei Wang, Yanfang Ma, Man Zhao, Minfeng Zhou, Yan Xiao, Zifei Sun, Lili Tong
Bioactive species in cells can provide information about signal transduction, cell function, and the effects of disease treatment. In this article, a novel micro-biosensor was fabricated to detect glucose in individual human stomach cancer cells (MGC80-3 cells) with capillary electrophoresis (CE). We fabricated the micro-biosensors by immobilizing a single-walled carbon nanotube-glucose oxidase (GOx)-glutaraldehyde (GA) bio-composite at the palladium nanoparticle (PdNPs) modified Pt electrode. The linear concentration of glucose ranged from 2...
October 21, 2016: Journal of Chromatography. A
Jane Hughes, Wayne J Wilson, Naomi MacBean, Anne E Hill
OBJECTIVE: To compare simulated patients (SP) versus seminars for training audiology students to take a case history and give feedback with adult patients. DESIGN: A randomized controlled trial with cross-over. STUDY SAMPLE: Twenty-four audiology students, five SPs, two clinical educators (CE) and three evaluators. Students were randomly allocated to Group 1 who completed SP then seminar training or Group 2 who completed seminar then SP training...
December 2016: International Journal of Audiology
Ruchira M Jha, Ava M Puccio, David O Okonkwo, Benjamin E Zusman, Seo-Young Park, Jessica Wallisch, Philip E Empey, Lori A Shutter, Robert S B Clark, Patrick M Kochanek, Yvette P Conley
OBJECTIVE: Cerebral edema (CE) in traumatic brain injury (TBI) is the consequence of multiple underlying mechanisms and is associated with unfavorable outcomes. Genetic variability in these pathways likely explains some of the clinical heterogeneity observed in edema development. A role for sulfonylurea receptor-1 (Sur1) in CE is supported. However, there are no prior studies examining the effect of genetic variability in the Sur1 gene (ABCC8) on the development of CE. We hypothesize that ABCC8 single nucleotide polymorphisms (SNPs) are predictive of CE...
September 27, 2016: Neurocritical Care
Mai Yamamoto, Ritchie Ly, Biban Gill, Yujie Zhu, Jose Moran-Mirabal, Philip Britz-McKibbin
Capillary electrophoresis-mass spectrometry (CE-MS) represents a high efficiency microscale separation platform for untargeted profiling of polar/ionic metabolites that is ideal for volume-restricted biological specimens with minimal sample workup. Despite these advantages, the long-term stability of CE-MS remains a major obstacle hampering its widespread application in metabolomics notably for routine analysis of anionic metabolites under negative ion mode conditions. Herein, we report for the first time that commonly used ammonia containing buffers compatible with electrospray ionization (ESI)-MS can compromise the integrity of fused-silica capillaries via aminolysis of their outer polyimide coating...
October 10, 2016: Analytical Chemistry
E C Costa, T C B Dantas, L F de Farias Junior, D T Frazão, J Prestes, S R Moreira, R M Ritti-Dias, R A Tibana, T A Duhamel
Recently, post-exercise blood pressure (BP) has been considered a predictive tool to identify individuals who are responsive or not to BP reductions with exercise training (i. e., "high" and "low responders"). This study aimed to analyze the inter- and intra-individual BP responsiveness following a single bout of high-intensity interval exercise (HIIE) and continuous exercise (CE) in normotensive men (n=14; 24.5±4.2 years). Mean change in BP during the 60 min period post-exercise was analyzed and minimal detectable change (MDC) was calculated to classify the subjects as "low" (no post-exercise hypotension [PEH]) and "high responders" (PEH occurrence) following each exercise protocol (inter-individual analysis)...
September 27, 2016: International Journal of Sports Medicine
Jing Li, Ben-Cang Cui, Yuan-Hua Lin, Xu-Liang Deng, Ming Li, Ce-Wen Nan
OBJECTIVE: To evaluate the microstructure and mechanical behavior of polymer-infiltrated zirconia ceramics as a function of Fe2O3 concentration (0-0.3mol%). METHODS: Polymer-infiltrated zirconia ceramics with different concentrations of Fe2O3 were prepared by infiltration and polymerization. XRD was employed to determine phase structure. The microstructure and fracture mechanism was observed by SEM. Flexural strength and fracture toughness were measured by three-point bending method and single-edge-notched beam method, respectively...
September 23, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
Lee Yien Thang, Hong Heng See, Joselito P Quirino
The translation of stacking techniques used in capillary electrophoresis (CE) to microchip CE (MCE) in order to improve concentration sensitivity is an important area of study. The success in stacking relies on the generation and control of the stacking boundaries which is a challenge in MCE because the manipulation of solutions is not as straightforward as in CE with a single channel. Here, a simple and rapid online sample concentration (stacking strategy) in a battery operated nonaqueous MCE device with a commercially available double T-junction glass chip is presented...
October 5, 2016: Analytical Chemistry
Qian Zhang, Longlong Liu, Shuhui Tao, Congyi Wang, Cezhou Zhao, César González, Yannick J Dappe, Richard J Nichols, Li Yang
We have measured the single-molecule conductance of 1,n-alkanedithiol molecular bridges (n = 4, 6, 8, 10, 12) on a graphene substrate using scanning tunneling microscopy (STM)-formed electrical junctions. The conductance values of this homologous series ranged from 2.3 nS (n = 12) to 53 nS (n = 4), with a decay constant βn of 0.40 per methylene (-CH2) group. This result is explained by a combination of density functional theory (DFT) and Keldysh-Green function calculations. The obtained decay, which is much lower than the one obtained for symmetric gold junctions, is related to the weak coupling at the molecule-graphene interface and the electronic structure of graphene...
October 12, 2016: Nano Letters
Marc Philippe, Georg Junker, Hannes Gatterer, Andreas Melmer, Martin Burtscher
BACKGROUND: Single bouts of muscle damaging eccentric exercise (EE) affect glucose metabolism negatively while single bouts of concentric (CE) and not muscle damaging eccentric exercise have positive acute short-term effects on glucose metabolism. It has been proposed that long-term endurance EE might be more effective in improving glucose metabolism than long-term CE when adjusted for energy expenditure. This would imply that adaptations of glucose metabolism are dependent on the type of exercise...
2016: SpringerPlus
Aaron Brice, Donna R Whelan, Naoto Ito, Kenta Shimizu, Linda Wiltzer-Bach, Camden Y Lo, Danielle Blondel, David A Jans, Toby D M Bell, Gregory W Moseley
Although microtubules (MTs) are known to have important roles in intracellular transport of many viruses, a number of reports suggest that specific viral MT-associated proteins (MAPs) target MTs to subvert distinct MT-dependent cellular processes. The precise functional importance of these interactions and their roles in pathogenesis, however, remain largely unresolved. To assess the association with disease of the rabies virus (RABV) MAP, P3, we quantitatively compared the phenotypes of P3 from a pathogenic RABV strain, Nishigahara (Ni) and a non-pathogenic Ni-derivative strain, Ni-CE...
2016: Scientific Reports
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