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https://www.readbyqxmd.com/read/29332839/magnetic-solid-phase-extraction-based-on-magnetic-multiwalled-carbon-nanotubes-for-the-simultaneous-enantiomeric-analysis-of-five-%C3%AE-blockers-in-the-environmental-samples-by-chiral-liquid-chromatography-coupled-with-tandem-mass-spectrometry
#1
Zhaokun Wang, Xue Zhang, Shenmeng Jiang, Xingjie Guo
In this work, the magnetic multiwalled carbon nanotubes (Mag-MWCNTs) were prepared by self-assembly method and characterized by scanning electron microscopy, X-ray powder diffraction, energy dispersive X-ray and vibrating sample magnetometer. Then, these synthetic Mag-MWCNTs were used as sorbents to extract five β-blockers (atenolol, metoprolol, esmolol, pindolol and arotinolol) by magnetic solid-phase extraction. The target analytes adsorbed on Mag-MWCNTs were eluted and determined on a chiral α-acid glycoprotein column coupled with a triple quadrupole mass spectrometry...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29332798/supported-carbon-dots-serve-as-high-performance-adsorbent-for-the-retention-of-trace-cadmium
#2
Yi-Kun Li, Ting Yang, Ming-Li Chen, Jian-Hua Wang
Carbon dots were prepared via a one-pot hydrothermal route, and a new solid-phase extraction (SPE) adsorbent was developed by immobilizing the carbon dots on the microcarrier cytopore, shortly termed as C-dots@cytopore. The C-dots@cytopore composites were characterized by means of FT-IR, SEM, XPS and fluorescence spectrometry. The performance of the composites for the adsorption of heavy metals was thoroughly evaluated by using cadmium as a model. The binding of cadmium on C-dots@cytopore fits Langmuir adsorption, and the adsorption dynamic follows pseudo-second-order adsorption kinetics model...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29331822/synthesis-of-uio-66-oh-zirconium-metal-organic-framework-and-its-application-for-selective-extraction-and-trace-determination-of-thorium-in-water-samples-by-spectrophotometry
#3
Zahra Safaei Moghaddam, Massoud Kaykhaii, Mostafa Khajeh, Ali Reza Oveisi
In this study, a zirconium-based metal-organic framework (Zr-MOF), named UiO-66-OH, was synthesized by the solvo-thermal method and characterized by Fourier transform-infrared spectroscopy (FTIR), powder X-ray diffraction (PXRD), and scanning electron microscopy (SEM). This Zr-MOF was then employed as a sorbent for selective extraction and preconcentration of thorium ions after their complexation with 2‑(2,4‑dihydroxyphenyl)‑3,5,7‑trihydroxychromen‑4‑one (morin) from environmental water samples prior to its spectrophotometrical determination...
January 5, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29330603/magnetic-covalent-triazine-based-frameworks-as-magnetic-solid-phase-extraction-adsorbents-for-sensitive-determination-of-perfluorinated-compounds-in-environmental-water-samples
#4
Ji-Yun Ren, Xiao-Li Wang, Xiao-Li Li, Ming-Lin Wang, Ru-Song Zhao, Jin-Ming Lin
Covalent organic frameworks (COFs), which are a new type of carbonaceous polymeric material, have attracted great interest because of their large surface area and high chemical and thermal stability. However, to the best of our knowledge, no work has reported the use of magnetic COFs as adsorbents for magnetic solid-phase extraction (MSPE) to enrich and determine environmental pollutants. This work aims to investigate the feasibility of using covalent triazine-based framework (CTF)/Fe2O3 composites as MSPE adsorbents to enrich and analyze perfluorinated compounds (PFCs) at trace levels in water samples...
January 12, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29330191/thermophilic-alkaline-fermentation-followed-by-mesophilic-anaerobic-digestion-for-efficient-hydrogen-and-methane-production-from-waste-activated-sludge-focusing-on-dynamics-of-bacterial-pathogens-as-revealed-by-the-combination-of-metagenomic-and-qpcr-analysis
#5
Jingjing Wan, Yuhang Jing, Yue Rao, Shicheng Zhang, Gang Luo
Thermophilic alkaline fermentation followed by mesophilic anaerobic digestion (TM) for hydrogen and methane production from waste activated sludge (WAS) was investigated. TM process was also compared to mesophilic alkaline fermentation followed by mesophilic anaerobic digestion (MM) process and one-stage mesophilic anaerobic digestion (M) process. The results showed that both hydrogen yield (74.5 mLH2/gVS) and methane yield (150.7 mLCH4/gVS) in TM process were higher than those (6.7 mLH2/gVS and 127.8 mLCH4/gVS) in MM process...
January 12, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29329322/methylene-tetrahydrofolate-reductase-contributes-to-allergic-airway-disease
#6
Kenneth R Eyring, Brent S Pedersen, Kenneth N Maclean, Sally P Stabler, Ivana V Yang, David A Schwartz
RATIONALE: Environmental exposures strongly influence the development and progression of asthma. We have previously demonstrated that mice exposed to a diet enriched with methyl donors during vulnerable periods of fetal development can enhance the heritable risk of allergic airway disease through epigenetic changes. There is conflicting evidence on the role of folate (one of the primary methyl donors) in modifying allergic airway disease. OBJECTIVES: We hypothesized that blocking folate metabolism through the loss of methylene-tetrahydrofolate reductase (Mthfr) activity would reduce the allergic airway disease phenotype through epigenetic mechanisms...
2018: PloS One
https://www.readbyqxmd.com/read/29325990/quantitative-proteomics-reveals-a-role-of-jaz7-in-plant-defense-response-to-pseudomonas-syringae-dc3000
#7
Tong Zhang, Li Meng, Wenwen Kong, Zepeng Yin, Yang Wang, Jacqueline D Schneider, Sixue Chen
Jasmonate ZIM-domain (JAZ) proteins are key transcriptional repressors regulating various biological processes. Although many studies have studied JAZ proteins by genetic and biochemical analyses, little is known about JAZ7-associated global protein networks and how JAZ7 contributes to bacterial pathogen defense. In this study, we aim to fill this knowledge gap by conducting unbiased large-scale quantitative proteomics using tandem mass tags (TMT). We compared the proteomes of a JAZ7 knock-out line, a JAZ7 overexpression line, as well as the wild type Arabidopsis plants in the presence and absence of Pseudomonas syringae DC3000 infection...
January 8, 2018: Journal of Proteomics
https://www.readbyqxmd.com/read/29324386/effects-of-two-ecological-earthworm-species-on-atrazine-degradation-performance-and-bacterial-community-structure-in-red-soil
#8
Zhong Lin, Zhen Zhen, Lei Ren, Jiewen Yang, Chunling Luo, Laiyuan Zhong, Hanqiao Hu, Yanqiu Liang, Yongtao Li, Dayi Zhang
Vermicomposting is an effective and environmentally friendly approach for eliminating soil organic contamination. Atrazine is one of the most commonly applied triazinic herbicides and frequently detected in agricultural soils. This study investigated the roles and mechanisms of two earthworm species (epigeic Eisenia foetida and endogeic Amynthas robustus) in microbial degradation of atrazine. Both earthworms accelerated atrazine degradation performance from 39.0% in sterile soils to 94.9%-95.7%, via neutralizing soil pH, consuming soil humus, altering bacterial community structure, enriching indigenous atrazine degraders and excreting the intestinal atrazine-degrading bacteria...
December 29, 2017: Chemosphere
https://www.readbyqxmd.com/read/29321302/rapid-seasonal-evolution-in-innate-immunity-of-wild-drosophila-melanogaster
#9
Emily L Behrman, Virginia M Howick, Martin Kapun, Fabian Staubach, Alan O Bergland, Dmitri A Petrov, Brian P Lazzaro, Paul S Schmidt
Understanding the rate of evolutionary change and the genetic architecture that facilitates rapid adaptation is a current challenge in evolutionary biology. Comparative studies show that genes with immune function are among the most rapidly evolving genes across a range of taxa. Here, we use immune defence in natural populations of Drosophila melanogaster to understand the rate of evolution in natural populations and the genetics underlying rapid change. We probed the immune system using the natural pathogens Enterococcus faecalis and Providencia rettgeri to measure post-infection survival and bacterial load of wild D...
January 10, 2018: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/29321033/environmental-enrichment-intervention-for-rett-syndrome-an-individually-randomised-stepped-wedge-trial
#10
Jenny Downs, Jenny Rodger, Chen Li, Xuesong Tan, Nan Hu, Kingsley Wong, Nicholas de Klerk, Helen Leonard
BACKGROUND: Rett syndrome is caused by a pathogenic mutation in the MECP2 gene with major consequences for motor and cognitive development. One of the effects of impaired MECP2 function is reduced production of Brain Derived Neurotrophic Factor (BDNF), a protein required for normal neuronal development. When housed in an enriched environment, MECP2 null mice improved motor abilities and increased levels of BDNF in the brain. We investigated the effects of environmental enrichment on gross motor skills and blood BDNF levels in girls with Rett syndrome...
January 10, 2018: Orphanet Journal of Rare Diseases
https://www.readbyqxmd.com/read/29320848/assessment-of-metal-immission-in-urban-environments-using-elemental-concentrations-and-zn-isotope-signatures-in-leaves-of-nerium-oleander
#11
Ana Martín, Cristina Caldelas, Dominik Jakob Weiss, Iker Aranjuelo, Enrique Navarro
A thorough understanding of spatial and temporal emission and immission patterns of air pollutants in urban areas is challenged by the low number of air quality monitoring stations available. Plants are promising low cost biomonitoring tools. However, source identification of the trace metals incorporated in plant tissues (i.e. natural vs. anthropogenic) and the identification of the best plant to use remain fundamental challenges. To this end, Nerium oleander L. collected in the city of Zaragoza (NE Spain) has been investigated as a biomonitoring tool for assessing the spatial immission patterns of airborne metals (Pb, Cu, Cr, Ni, Ce, and Zn)...
January 10, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29319006/condition-optimization-for-exfoliation-of-two-dimensional-titanium-carbide-ti3c2tx
#12
Krishnamoorthy Rajavel, Tao Ke, Kun Yang, Daohui Lin
The new class of 2D MXene material exfoliated from transition metal carbides receives increasing research interests due to its extraordinary property and high potential in energy and environmental applications. However, the exfoliation of Ti3C2Tx, a widely studied MXene, from its precursor Ti3AlC2 by chemical etching in HF solution remains to be optimized. This study investigated the optimum exfoliation condition through systematic evaluating potential effects of reaction parameters, including the weight ratio of Ti3AlC2 in HF solution, etching time, reaction temperature, repeating etching, and sonication, on the yield, purity, and structure of produced Ti3C2Tx...
January 10, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29317594/polymorphism-in-tmem132d-regulates-expression-and-anxiety-related-behavior-through-binding-of-rna-polymerase-ii-complex
#13
Roshan R Naik, Sergey V Sotnikov, Rebekka P Diepold, Stella Iurato, Patrick O Markt, Andrea Bultmann, Nadine Brehm, Tobias Mattheus, Beat Lutz, Angelika Erhardt, Elisabeth B Binder, Ulrike Schmidt, Florian Holsboer, Rainer Landgraf, Ludwig Czibere
TMEM132D is a candidate gene, where risk genotypes have been associated with anxiety severity along with higher mRNA expression in the frontal cortex of panic disorder patients. Concurrently, in a high (HAB) and low (LAB) trait anxiety mouse model, Tmem132d was found to show increased expression in the anterior cingulate cortex (aCC) of HAB as compared to LAB mice. To understand the molecular underpinnings underlying the differential expression, we sequenced the gene and found two single-nucleotide polymorphisms (SNPs) in the promoter differing between both lines which could explain the observed mRNA expression profiles using gene reporter assays...
January 10, 2018: Translational Psychiatry
https://www.readbyqxmd.com/read/29316879/assessment-of-runs-of-homozygosity-islands-and-estimates-of-genomic-inbreeding-in-gyr-bos-indicus-dairy-cattle
#14
Elisa Peripolli, Nedenia Bonvino Stafuzza, Danísio Prado Munari, André Luís Ferreira Lima, Renato Irgang, Marco Antonio Machado, João Cláudio do Carmo Panetto, Ricardo Vieira Ventura, Fernando Baldi, Marcos Vinícius Gualberto Barbosa da Silva
BACKGROUND: Runs of homozygosity (ROH) are continuous homozygous segments of the DNA sequence. They have been applied to quantify individual autozygosity and used as a potential inbreeding measure in livestock species. The aim of the present study was (i) to investigate genome-wide autozygosity to identify and characterize ROH patterns in Gyr dairy cattle genome; (ii) identify ROH islands for gene content and enrichment in segments shared by more than 50% of the samples, and (iii) compare estimates of molecular inbreeding calculated from ROH (FROH), genomic relationship matrix approach (FGRM) and based on the observed versus expected number of homozygous genotypes (FHOM), and from pedigree-based coefficient (FPED)...
January 9, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29316318/a-perspective-review-on-the-materials-and-mechanisms-of-photo-assisted-chemical-reactions-under-light-and-dark-can-it-be-called-as-day-night-photocatalysis
#15
Sakar Mohan, Nguyen Chinh-Chien, Vu Manh-Hiep, Trong-On Do
The photo-assisted catalytic reaction, conventionally known as photocatalysis, is blooming into the field of energy and environmental applications. It is widely known that the discovery of TiO2-assited photochemical reactions has led to achieve several unique applications such as degradation of pollutants in water and air, hydrogen production through water splitting, fuel conversion, cancer treatment, anti-bacterial activity, self-cleaning glasses and concrete, etc. These multifaceted applications of this phenomenon can be enriched and expanded further if this process is equipped with more tools and functions...
January 8, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29315909/seeking-excellence-an-evaluation-of-235-international-laboratories-conducting-water-isotope-analyses-by-isotope-ratio-and-laser-absorption-spectrometer
#16
L I Wassenaar, S Terzer-Wassmuth, C Douence, L Araguas-Araguas, P K Aggarwal, T B Coplen
RATIONALE: Water stable isotope ratios (δ2 H and δ18 O values) are widely used tracers in environmental studies; hence, accurate and precise assays are required for providing sound scientific information. We tested the analytical performance of 235 international laboratories conducting water isotope analyses using dual-inlet and continuous-flow isotope ratio mass spectrometers and laser spectrometers through a water isotope inter-comparison test. METHODS: Eight test water samples were distributed by the IAEA to international stable isotope laboratories...
January 5, 2018: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/29313157/microbial-community-response-reveals-underlying-mechanism-of-industrial-scale-manganese-sand-biofilters-used-for-the-simultaneous-removal-of-iron-manganese-and-ammonia-from-groundwater
#17
Yu Zhang, Rui Sun, Aijuan Zhou, Jiaguang Zhang, Yunbo Luan, Jianna Jia, Xiuping Yue, Jie Zhang
Most studies have employed aeration-biofiltration process for the simultaneous removal of iron, manganese and ammonia in groundwater. However, what's inside the "black box", i.e., the potential contribution of functional microorganisms behavior and interactions have seldom been investigated. Moreover, little attention has been paid to the correlations between environmental variables and functional microorganisms. In this study, the performance of industrial-scale biofilters for the contaminated groundwater treatment was studied...
January 8, 2018: AMB Express
https://www.readbyqxmd.com/read/29310749/culture-independent-approaches-to-chlamydial-genomics
#18
Alyce Taylor-Brown, Danielle Madden, Adam Polkinghorne
The expanding field of bacterial genomics has revolutionized our understanding of microbial diversity, biology and phylogeny. For most species, DNA extracted from culture material is used as the template for genome sequencing; however, the majority of microbes are actually uncultivable, and others, such as obligate intracellular bacteria, require laborious tissue culture to yield sufficient genomic material for sequencing. Chlamydiae are one such group of obligate intracellular microbes whose characterization has been hampered by this requirement...
January 3, 2018: Microbial Genomics
https://www.readbyqxmd.com/read/29310216/an-on-line-solid-phase-extraction-disc-packed-with-a-phytic-acid-induced-3d-graphene-based-foam-for-the-sensitive-hplc-pda-determination-of-bisphenol-a-migration-in-disposable-syringes
#19
Qiuhong Yao, Yufeng Feng, Connieal Tan, Shujun Xia, Li Zhao, Shuya Wang, Yiru Wang, Xi Chen
In this study, an on-line SPE-disc filled with phytic acid induced 3D graphene-based foam (PAGF) has been applied to the determination of the migration of bisphenol A (BPA) in disposable syringes. The approach is of quick, easy, sensitive and environmentally-friendly. Experimental conditions were investigated and optimized including the character of enriched material and the amount of migrated BPA under different temperature, time and pH conditions. The experimental results reveal that the approach presents a wide linear range between the signal response and the concentration of BPA from 1 to 1000ngmL-1, as well as the detection limit of 0...
March 1, 2018: Talanta
https://www.readbyqxmd.com/read/29306832/ecotoxicological-potential-of-the-biocides-terbutryn-octhilinone-and-methylisothiazolinone-underestimated-risk-from-biocidal-pathways
#20
Simon Kresmann, Arokia Hansel Rajan Arokia, Christoph Koch, Bernd Sures
The use of biocides by industry, agriculture and households increased throughout the last two decades. Many new applications with known substances enriched the variety of biocidal pollution sources for the aquatic environment. While agriculture was the major source for a long time, leaching from building facades and preservation of personal care and cleaning products was identified as new sources in the last few years. With the different usage forms of biocidal products the complexity of legislative regulation increased as well...
January 4, 2018: Science of the Total Environment
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