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https://www.readbyqxmd.com/read/29784424/sensitive-determination-of-seven-triazine-herbicide-in-honey-tomato-and-environmental-water-samples-by-hollow-fiber-based-liquid-liquid-liquid-microextraction-combined-with-sweeping-micellar-electrokinetic-capillary-chromatography
#1
Qing Yang, Beibei Chen, Man He, Bin Hu
A rapid, simple, and effective method has been developed for the determination of seven triazine herbicides (terbutryn, prometryn, ametryn, prometon, propazine, atrazine, simazine) by coupling off-line hollow fiber liquid liquid liquid microextraction (HF-LLLME) with on-line sweeping micellar electrokinetic chromatography (sweeping-MEKC). In HF-LLLME, seven target triazines in hydrophobic form were extracted from the sample solution into decane impregnated in the pores of the hollow fiber, and then back-extracted into 1 mol L-1 H3 PO4 inside the hollow fiber lumen...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29781219/disentangling-the-effects-of-acidic-air-pollution-atmospheric-co-2-and-climate-change-on-recent-growth-of-red-spruce-trees-in-the-central-appalachian-mountains
#2
Justin M Mathias, Richard B Thomas
In the 45 years after legislation of the Clean Air Act, there has been tremendous progress in reducing acidic air pollutants in the eastern United States, yet limited evidence exists that cleaner air has improved forest health. Here, we investigate the influence of recent environmental changes on the growth and physiology of red spruce (Picea rubens Sarg.) trees, a key indicator species of forest health, spanning three locations along a 100 km transect in the Central Appalachian Mountains. We incorporated a multiproxy approach using 75-year tree ring chronologies of basal tree growth, carbon isotope discrimination (∆13 C, a proxy for leaf gas exchange), and δ15 N (a proxy for ecosystem N status) to examine tree and ecosystem level responses to environmental change...
May 20, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29779688/how-to-better-monitor-and-clean-irregular-surfaces-in-operating-rooms-insights-gained-by-using-both-atp-luminescence-and-rodac-assays
#3
Olivia Ellis, Hilary Godwin, Maren David, Dan J Morse, Romney Humphries, Daniel Z Uslan
BACKGROUND: A major limitation to developing evidence-based approaches to infection prevention is the paucity of real-time, quantitative methods for monitoring the cleanliness of environmental surfaces in clinical settings. One solution that has been proposed is adenosine triphosphate (ATP) bioluminescence assays, but this method does not provide information about the source of the ATP. MATERIALS/METHODS: To address this gap, we conducted a study in which ATP bioluminescence was coupled with traditional RODAC sampling and matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry to assess which organisms were viable and present...
May 17, 2018: American Journal of Infection Control
https://www.readbyqxmd.com/read/29776546/recent-advances-in-analytical-methods-for-the-determination-of-4-alkylphenols-and-bisphenol-a-in-solid-environmental-matrices-a-critical-review
#4
REVIEW
N Salgueiro-González, S Castiglioni, E Zuccato, I Turnes-Carou, P López-Mahía, S Muniategui-Lorenzo
The problem of endocrine disrupting compounds (EDCs) in the environment has become a worldwide concern in recent decades. Besides their toxicological effects at low concentrations and their widespread use in industrial and household applications, these pollutants pose a risk for non-target organisms and also for public safety. Analytical methods to determine these compounds at trace levels in different matrices are urgently needed. This review critically discusses trends in analytical methods for well-known EDCs like alkylphenols and bisphenol A in solid environmental matrices, including sediment and aquatic biological samples (from 2006 to 2018)...
September 18, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29776457/a-new-green-method-for-the-quantitative-analysis-of-enrofloxacin-by-fourier-transform-infrared-spectroscopy
#5
Camila Tavares Rebouças, Ana Carolina Kogawa, Hérida Regina Nunes Salgado
Background: A green analytical chemistry method was developed for quantification of enrofloxacin in tablets. The drug, a second-generation fluoroquinolone, was first introduced in veterinary medicine for the treatment of various bacterial species. Objective: This study proposed to develop, validate, and apply a reliable, low-cost, fast, and simple IR spectroscopy method for quantitative routine determination of enrofloxacin in tablets. Methods: The method was completely validated according to the International Conference on Harmonisation guidelines, showing accuracy, precision, selectivity, robustness, and linearity...
May 18, 2018: Journal of AOAC International
https://www.readbyqxmd.com/read/29775300/secondary-organic-aerosol-formation-from-ambient-air-at-an-urban-site-in-beijing-effects-of-oh-exposure-and-precursor-concentrations
#6
Jun Liu, Biwu Chu, Tianzeng Chen, Changgeng Liu, Ling Wang, Xiaolei Bao, Hong He
Secondary organic aerosol (SOA) is an important component of atmospheric fine particles (PM2.5 ), while the key factors controlling SOA formation in ambient air remain poorly understood. In this work, the SOA formation in Beijing urban ambient air was investigated using an oxidation flow reactor (OFR) with high concentrations of OH radicals. The SOA formation potential increased significantly with the increase of ambient PM2.5 concentration during the observation. The optimum ambient exposure time, which is the aging time equivalent to atmospheric oxidation (with similar OH exposure) associated with the peak SOA formation, varied between 2 to 4 days in this study...
May 18, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29772711/biomimetic-superhydrophobic-hollowed-out-pyramid-surface-based-on-self-assembly
#7
Weipeng Luo, Bin Yu, Dingbang Xiao, Meng Zhang, Xuezhong Wu, Guoxi Li
In this paper, we present a periodic hollowed-out pyramid microstructure with excellent superhydrophobicity. In our approach, T-topping pillars and capillary-induced self-assembly methods were combined with the photolithography process to fabricate a hollowed-out pyramid structure. First, a wideband ultraviolet source without a filter was used to fabricate the T-topping pillars during the exposure process; then, the evaporation-induced assembly collapsed the pillars and formed the hollowed-out pyramid structure...
May 16, 2018: Materials
https://www.readbyqxmd.com/read/29772262/an-international-survey-of-cleaning-and-disinfection-practices-in-the-healthcare-environment
#8
Nikki Kenters, Thomas Gottlieb, Joost Hopman, Shaheen Mehtar, Marin L Schweizer, Ermira Tartari, E G W Huijskens, Andreas Voss
BACKGROUND: Antimicrobial resistance has become an urgent global health priority. Basic hygiene practices and cleaning and disinfection of the hospital environment are key in preventing pathogen cross-transmission. AIM: To our knowledge no studies have assessed the worldwide differences in cleaning and disinfection practices in healthcare facilities. The electronic survey described here was developed in order to evaluate differences in healthcare facility cleaning practices around the world...
May 14, 2018: Journal of Hospital Infection
https://www.readbyqxmd.com/read/29771969/impact-of-industrial-phosphate-waste-discharge-on-the-marine-environment-in-the-gulf-of-gabes-tunisia
#9
Akram El Kateb, Claudio Stalder, Andres Rüggeberg, Christoph Neururer, Jorge E Spangenberg, Silvia Spezzaferri
The marine environment in the Gulf of Gabes (southern Tunisia) is severely impacted by phosphate industries. Nowadays, three localities, Sfax, Skhira and Gabes produce phosphoric acid along the coasts of this Gulf and generate a large amount of phosphogypsum as a waste product. The Gabes phosphate industry is the major cause of pollution in the Gulf because most of the waste is directly discharged into the sea without preliminary treatment. This study investigates the marine environment in the proximity of the phosphate industries of Gabes and the coastal marine environment on the eastern coast of Djerba, without phosphate industry...
2018: PloS One
https://www.readbyqxmd.com/read/29771240/power-efficient-self-cleaning-hydrophilic-condenser-surface-for-portable-exhaled-breath-condensate-ebc-metabolomic-sampling
#10
Konstantin O Zamuruyev, Alexander James Schmidt, Eva Borras, Mitchell M McCartney, Michael Schivo, Nicholas J Kenyon, Jean-Pierre Delplanque, Cristina E Davis
In this work, we present a hydrophilic self-cleaning condenser surface for collection of biological and environmental aerosol samples. The condenser is installed in a battery-operated, hand-held breath sampling device. The device performance is characterized with collection and analysis of exhaled breath samples from a group of volunteers. The exhaled breath condensate is collected on a sub-cooled condenser surface, transferred into a storage vial, and its chemical content is analyzed with mass spectrometric methods...
May 17, 2018: Journal of Breath Research
https://www.readbyqxmd.com/read/29765079/determination-of-flumequine-enantiomers-and-7-hydroxyflumequine-in-water-and-sediment-by-chiral-hplc-coupled-with-hybrid-quadrupole-time-of-flight-mass-spectrometer
#11
Moyong Xue, Yuchang Qin, Xu Gu, Junguo Li, Yunfeng Gao, Xiaowei Yang, Ting Yao, Zhen Zhao
A liquid chromatography-tandem mass spectrometric (LC-MS/MS) method for simultaneous enantiomeric analysis of flumequine and its metabolite 7-hydroxyflumequine in water and sediment had been developed based on the separation method. Sediment samples were extracted with ACN and EDTA-Mcllvaine buffer solution (40:60, v/v) then were enriched and cleaned-up by Cleanert PEP solid-phase extraction cartridges. The extract solvent, solid cartridges, mobile phase ratios, and chiral separation column were all optimized to reach high sensitivity and selectivity, good peak shape, and satisfactory resolution...
May 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29764520/investigation-of-a-typhoid-fever-epidemic-in-moyale-sub-county-kenya-2014-2015
#12
Dahabo Adi Galgallo, Zeinab Gura Roka, Waqo G Boru, Khalumi Abill, James Ransom
AIM: Typhoid fever is a vaccine-preventable bacterial disease that causes significant morbidity and mortality throughout Africa. This paper describes an upsurge of typhoid fever cases in Moyale Sub-County (MSC), Kenya, 2014-2015. METHODS: We conducted active hospital and health facility surveillance and laboratory and antimicrobial sensitivity testing for all patients presenting with headache, fever, stomach pains, diarrhea, or constipation at five MSC health facilities between December 2014 and January 2015...
May 15, 2018: Journal of Health, Population, and Nutrition
https://www.readbyqxmd.com/read/29761966/-development-of-a-microenvironment-test-chamber-for-airborne-microbe-research
#13
Ningbo Zhan, Feng Chen, Yaohua Du, Zhi Cheng, Chenyu Li, Jinlong Wu, Taihu Wu
One of the most important environmental cleanliness indicators is airborne microbe. However, the particularity of clean operating environment and controlled experimental environment often leads to the limitation of the airborne microbe research. This paper designed and implemented a microenvironment test chamber for airborne microbe research in normal test conditions. Numerical simulation by Fluent showed that airborne microbes were evenly dispersed in the upper part of test chamber, and had a bottom-up concentration growth distribution...
October 1, 2017: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29759849/methicillin-resistant-staphylococcus-aureus-the-effects-are-more-than-skin-deep
#14
Carol E Muenks, Whitney C Sewell, Patrick G Hogan, Ryley M Thompson, David G Ross, Jeffrey W Wang, John J Morelli, Sarah J Gehlert, Stephanie A Fritz
OBJECTIVES: To assess the psychosocial effects of a methicillin-resistant Staphylococcus aureus (MRSA) diagnosis on the households of children with MRSA skin and soft tissue infection (SSTI). STUDY DESIGN: We constructed and administered an interview to the primary caregiver within the home of a child with a history of MRSA SSTI. RESULTS: Seventy-six households were enrolled. Survey responses were analyzed and grouped into 4 themes: health behavior changes, disclosure, social interactions, and knowledge/awareness...
May 11, 2018: Journal of Pediatrics
https://www.readbyqxmd.com/read/29758515/scavenging-performance-and-antioxidant-activity-of-%C3%AE-alumina-nanoparticles-towards-dpph-free-radical-spectroscopic-and-dft-d-studies
#15
Mehdi Zamani, Ali Moradi Delfani, Morteza Jabbari
The radical scavenging performance and antioxidant activity of γ-alumina nanoparticles towards 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical were investigated by spectroscopic and computational methods. The radical scavenging ability of γ-alumina nanoparticles in the media with different polarity (i.e. i-propanol and n-hexane) was evaluated by measuring the DPPH absorbance in UV-Vis absorption spectra. The structure and morphology of γ-alumina nanoparticles before and after adsorption of DPPH were studied using XRD, FT-IR and UV-Vis spectroscopic techniques...
May 3, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29754971/stenotrophomonas-maltophilia
#16
Shi-Qi An, Gabriele Berg
This infographic describes the key regulated traits of Stenotrophomonas maltophilia, important for beneficial plant interactions, and also its increasing incidence as a nosocomial and community-acquired infection. Stenotrophomonas maltophilia is a cosmopolitan and ubiquitous bacterium found in a range of environmental habitats, including extreme ones, although in nature it is mainly associated with plants. S. maltophilia fulfils important ecosystem functions in the sulfur and nitrogen cycles, in degradation of complex compounds and pollutants, and in promoti on of plant growth and health...
May 10, 2018: Trends in Microbiology
https://www.readbyqxmd.com/read/29754609/a-rapid-and-sensitive-method-for-the-analysis-of-lignin-phenols-in-environmental-samples-using-ultra-high-performance-liquid-chromatography-electrospray-ionization-tandem-mass-spectrometry-with-multiple-reaction-monitoring
#17
Ge Yan, Karl Kaiser
A novel ultra-high performance liquid chromatography-electrospray ionization-tandem mass spectrometry method was developed to enable the analysis of ultra-low levels of lignin phenols (<100 fmol) in environmental samples. The method included a sample clean-up with a polymer sorbent based solid-phase extraction and reversed-phase chromatography that allowed separation of all lignin phenols with minimal interference from co-eluting matrix components. The application of 13 C-labeled surrogate standards effectively compensated for variability associated with sample preparation and ion suppression...
September 6, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29754410/hi-tech-restoration-by-two-steps-biocleaning-process-of-triumph-of-death-fresco-at-the-camposanto-monumental-cemetery-pisa-italy
#18
Giancarlo Ranalli, Elisabetta Zanardini, Alessia Andreotti, Maria Perla Colombini, Cristina Corti, Pilar Bosch-Roig, Paola De Nuntiis, Giuseppe Lustrato, Paolo Mandrioli, Laura Rampazzi, Carlo Giantomassi, Donatella Zari
AIMS: In this work, the "hi-tech" complex biocleaning and restoration of the 14th-century fresco Triumph of Death (5.6x15.0 m) at the Camposanto Monumental Cemetery (Pisa, Italy) is reported. Since 2000, the restoration based on the biological cleaning of noble medieval frescoes, has been successfully utilized in this site. METHODS AND RESULTS: The novelty of this study is the 2-steps biocleaning process using Pseudomonas stutzeri A29 viable cells, previously applied for recovering other valuable frescoes...
May 13, 2018: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29754085/effects-of-haze-pollution-on-microbial-community-changes-and-correlation-with-chemical-components-in-atmospheric-particulate-matter
#19
Yujiao Sun, Shangwei Xu, Danyang Zheng, Jie Li, Hezhong Tian, Yong Wang
In this study, particulate matter (PM) with aerodynamic diameters of ≤2.5 and ≤10 μm (PM2.5 and PM10 , respectively), which was found at different concentrations in spring, was collected in Beijing. The chemical composition and bacterial community diversity of PM were determined, and the relationship between them was studied by 16S rRNA sequencing and mathematical statistics. Chemical composition analysis revealed greater relative percentages of total organic compounds (TOC) and secondary ions (NO3 - , SO4 2- , and NH4 + )...
May 10, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29750044/successful-control-of-resistance-in-pseudomonas-aeruginosa-using-antibiotic-stewardship-and-infection-control-programs-at-a-chinese-university-hospital-a-6-year-prospective-study
#20
Lei Liu, Bin Liu, Yu Li, Wei Zhang
Objective: Pseudomonas aeruginosa is emerging as a highly multidrug-resistant (MDR) nosocomial pathogen. Data on the efficacy of infection control measures in endemic situations are lacking. We investigated the effect of antimicrobial stewardship (AMS) and infection control programs (ICPs) in controlling the resistance of P. aeruginosa at a tertiary hospital center. Methods: Susceptibility and resistance were investigated using broth microdilution, as per the guidelines of the Clinical and Laboratory Standards Institute...
2018: Infection and Drug Resistance
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