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https://www.readbyqxmd.com/read/28230351/fabrication-and-demonstration-of-mercury-disc-well-probes-for-stripping-based-cyclic-voltammetry-scanning-electrochemical-microscopy
#1
Zachary J Barton, Joaquín Rodríguez-López
Scanning electrochemical microscopy (SECM) is a rising technique for the study of energy storage materials. Hg-based probes allow the extension of SECM investigations to ionic processes, but the risk of irreversible Hg amalgam saturation limits their operation to rapid timescales and dilute analyte solutions. Here, we report a novel fabrication protocol for Hg disc-well ultramicroelectrodes (UMEs), which retain access to stripping information but are less susceptible to amalgam saturation than traditional Hg sphere-caps or thin-films...
February 23, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28230350/cyclic-voltammetry-probe-approach-curves-with-alkali-amalgams-at-mercury-sphere-cap-scanning-electrochemical-microscopy-probes
#2
Zachary J Barton, Joaquín Rodríguez-López
We report a method of precisely positioning a Hg-based ultramicroelectrode (UME) for scanning electrochemical microscopy (SECM) investigations of any substrate. Hg-based probes are capable of performing amalgamation reactions with metal cations, which avoid unwanted side reactions and positive feedback mechanisms that can prove problematic for traditional probe positioning methods. However, prolonged collection of ions eventually leads to saturation of the amalgam accompanied by irreversible loss of Hg. In order to obtain negative feedback positioning control without risking damage to the SECM probe, we implement cyclic voltammetry probe approach surfaces (CV-PASs), consisting of CVs performed between incremental motor movements...
February 23, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28229046/genome-sequence-of-three-psychrobacter-sp-strains-with-potential-applications-in-bioremediation
#3
Aide Lasa, Jesús L Romalde
To date, the genus Psychrobacter consists of 37 recognized species isolated from different sources, however they are more frequently found in cold and other non-polar environments of low water activity. Some strains belonging to the genus have shown different enzymatic activities with potential applications in bioremediation or food industry. In the present study, the whole genome sequences of three Psychrobacter-like strains (C 20.9, Cmf 22.2 and Rd 27.2) isolated from reared clams in Galicia (Spain) are described...
June 2017: Genomics Data
https://www.readbyqxmd.com/read/28229018/-genomic-data-mining-of-the-marine-actinobacteria-streptomyces-sp-h-kf8-unveils-insights-into-multi-stress-related-genes-and-metabolic-pathways-involved-in-antimicrobial-synthesis
#4
Agustina Undabarrena, Juan A Ugalde, Michael Seeger, Beatriz Cámara
Streptomyces sp. H-KF8 is an actinobacterial strain isolated from marine sediments of a Chilean Patagonian fjord. Morphological characterization together with antibacterial activity was assessed in various culture media, revealing a carbon-source dependent activity mainly against Gram-positive bacteria (S. aureus and L. monocytogenes). Genome mining of this antibacterial-producing bacterium revealed the presence of 26 biosynthetic gene clusters (BGCs) for secondary metabolites, where among them, 81% have low similarities with known BGCs...
2017: PeerJ
https://www.readbyqxmd.com/read/28228917/isolation-and-characterisation-of-a-molybdenum-reducing-and-metanil-yellow-dye-decolourising-bacillus-sp-strain-neni-10-in-soils-from-west-sumatera-indonesia
#5
Rusnam Mansur, Neni Gusmanizar, Muhamad Akhmal Hakim Roslan, Siti Aqlima Ahmad, Mohd Yunus Shukor
A molybdenum reducing bacterium with the novel ability to decolorise the azo dye Metanil Yellow is reported. Optimal conditions for molybdenum reduction were pH 6.3 and at 34°C. Glucose was the best electron donor. Another requirement includes a narrow phosphate concentration between 2.5 and 7.5 mM. A time profile of Mo-blue production shows a lag period of approximately 12 hours, a maximum amount of Mo-blue produced at a molybdate concentration of 20 mM, and a peak production at 52 h of incubation. The heavy metals mercury, silver, copper and chromium inhibited reduction by 91...
January 2017: Tropical Life Sciences Research
https://www.readbyqxmd.com/read/28228718/current-concepts-on-the-physiopathological-relevance-of-dopaminergic-receptors
#6
REVIEW
Ada Ledonne, Nicola B Mercuri
Dopamine (DA) is a key neurotransmitter modulating essential functions of the central nervous system (CNS), like voluntary movement, reward, several cognitive functions and goal-oriented behaviors. The factual relevance of DAergic transmission can be well appreciated by considering that its dysfunction is recognized as a core alteration in several devastating neurological and psychiatric disorders, including Parkinson's disease (PD) and associated movement disorders, as well as, schizophrenia, bipolar disorder, attention deficit hyperactivity disorder (ADHD) and addiction...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28226212/h2s-modified-fe-ti-spinel-a-recyclable-magnetic-sorbent-for-recovering-gaseous-elemental-mercury-from-the-flue-gas-as-a-co-benefit-of-the-wet-electrostatic-precipitators
#7
Sijie Zou, Yong Liao, Shangchao Xiong, Nan Huang, Yang Geng, Shijian Yang
The non-recyclability of the sorbents used to capture Hg0 from the flue gas causes a high operation cost and the potential risk of exposure to Hg. The installment of wet electrostatic precipitators (WESPs) in coal-fired plants makes the recovery of spent sorbents for recycling and the centralized control of Hg pollution possible. In this work, H2S-modified Fe-Ti spinel was developed as a recyclable magnetic sorbent to recover Hg0 from the flue gas as a co-benefit of the WESP. Although Fe-Ti spinel exhibited poor Hg0 capture activity in the temperature range of the flue gas downstream of the flue gas desulfurization (FGD), H2S-modified Fe-Ti spinel exhibited excellent Hg0 capture performance with an average adsorption rate of 1...
February 22, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28225553/correlations-among-mercury-concentration-and-stable-isotope-ratios-of-carbon-and-nitrogen-of-amino-acids-in-scalp-hair-from-whale-meat-eaters-and-heavy-fish-eaters
#8
Tetsuya Endo, Hideki Ogasawara, Moriaki Hayasaka, Yohei Hotta, Osamu Kimura, Klaus J Petzke
RATIONALE: As Hg accumulation in marine animals generally increases with increased trophic level (δ(15) N values) through the food web, predators accumulate higher levels of Hg. The main source of human Hg intake is the consumption of fish and other marine animals, and Hg concentration in scalp hair is the preferred marker for evaluating consumption of marine animals. Difference of δ(15) N values between trophic and source amino acids of human consumers could enable us to estimate the trophic level of consumer without knowing the bulk δ(15) N value of their prey...
February 22, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28225135/liquid-metal-enabled-microfluidics
#9
Khashayar Khoshmanesh, Shi-Yang Tang, Jiu Yang Zhu, Samira Schaefer, Arnan Mitchell, Kourosh Kalantar-Zadeh, Michael D Dickey
Several gallium-based liquid metal alloys are liquid at room temperature. As 'liquid', such alloys have a low viscosity and a high surface tension while as 'metal', they have high thermal and electrical conductivities, similar to mercury. However, unlike mercury, these liquid metal alloys have low toxicity and a negligible vapor pressure, rendering them much safer. In comparison to mercury, the distinguishing feature of these alloys is the rapid formation of a self-limiting atomically thin layer of gallium oxide over their surface when exposed to oxygen...
February 22, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28225117/gold-nanoparticles-and-the-corresponding-filter-membrane-as-chemosensors-and-adsorbents-for-dual-signal-amplification-detection-and-fast-removal-of-mercury-ii
#10
Gaosong Chen, Jun Hai, Hao Wang, Weisheng Liu, Fengjuan Chen, Baodui Wang
Nowadays, the development of a multifunction system for the simultaneous multiple signal amplification detection and fast removal of Hg(2+) remains a major challenge. Herein, we for the first time used gold nanoparticles (Au NPs) and the corresponding filter membrane as chemosensors and adsorbents for dual signal amplification detection and fast removal of Hg(2+). Such a system was based on the formation of gold amalgam and a gold amalgam-based reaction between rhodamine B (RhB) and NaBH4 with fluorescence and colorimetric sensing functions...
February 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28224900/chemical-oxygen-demand-historical-perspectives-and-future-challenges
#11
REVIEW
René Bernard Geerdink, Ricardo Sebastiaan van den Hurk, Onno Jacob Epema
Determining the chemical oxygen demand (COD) is challenging because of the chemicals that are used in the current methods. There is an urgent need to determine the pollution in surface waters from (heavy) industry via a simple, reliable and fast method. However, the current procedures use hazardous chemicals, such as mercury, to suppress chloride interferences. This challenge has not been resolved. The introduction of modern detection techniques, such as chemiluminescence and oxidation procedures, e.g., microwave and ultrasound dissolution, has not resulted in a breakthrough...
April 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28224711/ratiometric-photoacoustic-molecular-imaging-for-methylmercury-detection-in-living-subjects
#12
Yi Liu, Sheng Wang, Ying Ma, Jing Lin, Hai-Yan Wang, Yueqing Gu, Xiaoyuan Chen, Peng Huang
Photoacoustic molecular imaging is an emerging and promising diagnostic tool for heavy metal ions detection. Methylmercury (MeHg(+) ) is one of the most potent neurotoxins, which damages the brain and nervous system of human beings through fish consumption. The development of a selective and sensitive method for MeHg(+) detection is highly desirable. In this Communication, we develope a chemoselective photoacoustic sensor (LP-hCy7) composed of the liposome (LP) and MeHg(+) -responsive near-infrared (NIR) cyanine dye (hCy7) for MeHg(+) detection within living subjects, such as zebrafish and mouse...
February 22, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28224658/predictive-meta-regressions-relating-mercury-tissue-concentrations-of-freshwater-piscivorous-mammals
#13
Kristin M Eccles, Philippe J Thomas, Hing Man Chan
Mercury (Hg) is a pollutant of global concern. Sentinel species, such as river otter (Lontra canadensis) and mink (Neovison vison), are often used to monitor environmental concentrations in freshwater ecosystems. Tissue total Hg (THg) concentrations are frequently used as biomarkers of exposure. However, there is no comprehensive model relating Hg tissue concentrations in different tissues, making inter-study comparisons challenging. Our objective was to establish conversion factors relating fur, brain, liver, kidney, and muscle THg concentrations using mean concentrations and standard errors reported in the literature...
February 22, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28223993/diacylglycerol-kinases-are-widespread-in-higher-plants-and-display-inducible-gene-expression-in-response-to-beneficial-elements-metal-and-metalloid-ions
#14
Hugo F Escobar-Sepúlveda, Libia I Trejo-Téllez, Paulino Pérez-Rodríguez, Juan V Hidalgo-Contreras, Fernando C Gómez-Merino
Diacylglycerol kinases (DGKs) are pivotal signaling enzymes that phosphorylate diacylglycerol (DAG) to yield phosphatidic acid (PA). The biosynthesis of PA from phospholipase D (PLD) and the coupled phospholipase C (PLC)/DGK route is a crucial signaling process in eukaryotic cells. Next to PLD, the PLC/DGK pathway is the second most important generator of PA in response to biotic and abiotic stresses. In eukaryotic cells, DGK, DAG, and PA are implicated in vital processes such as growth, development, and responses to environmental cues...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28223758/allergy-to-gold-the-two-faces-of-mercury
#15
Paolo D Pigatto, Gianpaolo Guzzi
No abstract text is available yet for this article.
February 2017: Annals of Dermatology
https://www.readbyqxmd.com/read/28223206/accumulation-of-heavy-metals-in-people-on-a-gluten-free-diet
#16
Stephanie L Raehsler, Rok Seon Choung, Eric V Marietta, Joseph A Murray
BACKGROUND & AIMS: Specific foods such as fish and rice have high concentrations of metals such as arsenic, mercury, lead, cadmium, and cobalt. Many gluten-free diets (GFDs) include these foods, so we evaluated whether a GFD was associated with increased metal bioaccumulation. METHODS: We performed a population-based cross-sectional study using data collected from the National Health and Nutrition Examination Survey (NHANES), from 2009 through 2012, collecting information on the diagnosis of celiac disease and adherence to a GFD...
February 18, 2017: Clinical Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28222608/postsynthetically-modified-covalent-organic-frameworks-for-efficient-and-effective-mercury-removal
#17
Qi Sun, Briana Aguila, Jason Perman, Lyndsey D Earl, Carter W Abney, Yuchuan Cheng, Hao Wei, Nicholas Nguyen, Lukasz Wojtas, Shengqian Ma
A key challenge in environmental remediation is the design of adsorbents bearing an abundance of accessible chelating sites with high affinity, to achieve both rapid uptake and high capacity for the contaminants. Herein, we demonstrate how two-dimensional covalent organic frameworks (COFs) with well-defined mesopore structures display the right combination of properties to serve as a scaffold for decorating coordination sites to create ideal adsorbents. The proof-of-concept design is illustrated by modifying sulfur derivatives on a newly designed vinyl-functionalized mesoporous COF (COF-V) via thiol-ene "click" reaction...
February 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28222365/the-cessation-of-the-long-term-exposure-to-low-doses-of-mercury-ameliorates-the-increase-in-systolic-blood-pressure-and-vascular-damage-in-rats
#18
Danize Aparecida Rizzetti, João Guilherme Dini Torres, Alyne Goulart Escobar, Taiz Martins da Silva, Paola Zambelli Moraes, Raquel Hernanz, Franck Maciel Peçanha, Marta Miguel Castro, Dalton Valentim Vassallo, Mercedes Salaices, Maria Jesús Alonso, Giulia Alessandra Wiggers
This study aimed to verify whether a prolonged exposure to low-level mercury promotes haemodynamic disorders and studied the reversibility of this vascular damage. Rats were divided into seven groups: three control groups received saline solution (im) for 30, 60 or 90 days; two groups received HgCl2 (im, first dose, 4.6μg/kg, subsequent doses 0.07μg/kg/day) for 30 or 60 days; two groups received HgCl2 for 30 or 60 days (im, same doses) followed by a 30-day washout period. Systolic blood pressure (SBP) was measured, along with analysis of vascular response to acetylcholine (ACh) and phenylephrine (Phe) in the absence and presence of endothelium, a nitric oxide (NO) synthase inhibitor, an NADPH oxidase inhibitor, superoxide dismutase, a non-selective cyclooxygenase (COX) inhibitor and an AT1 receptor blocker...
February 18, 2017: Environmental Research
https://www.readbyqxmd.com/read/28222119/revised-hammersmith-scale-for-spinal-muscular-atrophy-a-sma-specific-clinical-outcome-assessment-tool
#19
Danielle Ramsey, Mariacristina Scoto, Anna Mayhew, Marion Main, Elena S Mazzone, Jacqueline Montes, Roberto de Sanctis, Sally Dunaway Young, Rachel Salazar, Allan M Glanzman, Amy Pasternak, Janet Quigley, Elizabeth Mirek, Tina Duong, Richard Gee, Matthew Civitello, Gihan Tennekoon, Marika Pane, Maria Carmela Pera, Kate Bushby, John Day, Basil T Darras, Darryl De Vivo, Richard Finkel, Eugenio Mercuri, Francesco Muntoni
Recent translational research developments in Spinal Muscular Atrophy (SMA), outcome measure design and demands from regulatory authorities require that clinical outcome assessments are 'fit for purpose'. An international collaboration (SMA REACH UK, Italian SMA Network and PNCRN USA) undertook an iterative process to address discontinuity in the recorded performance of the Hammersmith Functional Motor Scale Expanded and developed a revised functional scale using Rasch analysis, traditional psychometric techniques and the application of clinical sensibility via expert panels...
2017: PloS One
https://www.readbyqxmd.com/read/28221779/experimental-assessment-of-photon-fluence-rate-distributions-in-a-medium-pressure-uv-photoreactor
#20
Mengkai Li, Zhimin Qiang, Chen Wang, James R Bolton, Ernest R Blatchley
The performance of a medium-pressure (MP) mercury lamp photoreactor is strongly influenced by the spatial photon fluence rate (PFR) distributions, which are wavelength-dependent. To address this issue, PFR distributions in an MP lamp photoreactor were measured using a 360-degree response micro-fluorescent silica detector (MFSD). To accurately express the optical behavior in an MP photoreactor, PFR, MFSD response PFR (PFRMFSD), and effective germicidal PFR (PFRGER) were defined and compared. The measured axial and radial PFRMFSD values agreed well with the corresponding results from a simulation model (UVCalc®)...
February 21, 2017: Environmental Science & Technology
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