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https://www.readbyqxmd.com/read/29149996/coupling-of-two-centrifugeless-ultrasound-assisted-dispersive-solid-liquid-phase-microextractions-as-a-highly-selective-clean-and-efficient-method-for-determination-of-ultra-trace-amounts-of-non-steroidal-anti-inflammatory-drugs-in-complicated-matrices
#1
Somayeh Arghavani-Beydokhti, Maryam Rajabi, Alireza Asghari
In this work, a new, simple, rapid, and environmentally friendly method with a high sample clean-up capability termed as centrifugeless ultrasound-assisted dispersive micro solid-phase extraction coupled with salting-out ultrasound-assisted liquid-liquid microextraction based on solidification of a floating organic droplet followed by high performance liquid chromatography is introduced for the first time. In this method, the three non-steroidal anti-inflammatory drugs diclofenac, ibuprofen, and mefenamic acid are first extracted based on an effective nanoadsorbent named as the layered double hydroxide-carbon nanotube nanohybrid...
January 2, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29145129/high-contamination-in-the-areas-surrounding-abandoned-mines-and-mining-activities-an-impact-assessment-of-the-dilala-luilu-and-mpingiri-rivers-democratic-republic-of-the-congo
#2
Emmanuel K Atibu, Pierre Lacroix, Periyasamy Sivalingam, Nicolas Ray, Gregory Giuliani, Crispin K Mulaji, Jean-Paul Otamonga, Pius T Mpiana, Vera I Slaveykova, John Poté
Abandoned mines and mining activities constitute important sources of toxic metals and Rare Earth Elements (REEs) affecting surrounding environmental compartments and biota. This study investigates the contamination degree and distribution of toxic metals and REEs in contrasting sediment, soil and plant samples surrounding rivers in the African copperbelt area characterized by the presence of numerous abandoned mines, artisanal and industrial mining activities. ICP-MS results highlighted the highest concentration of Cu, Co and Pb in sediments reaching values of 146,801, 18,434 and 899 mg kg(-1), respectively...
October 21, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145056/environmental-life-cycle-assessment-of-marine-sediment-decontamination-by-citric-acid-enhanced-microwave-heating
#3
Pietro P Falciglia, Carlo Ingrao, Guido De Guidi, Alfio Catalfo, Guglielmo Finocchiaro, Marcello Farina, Maria Liali, Giuseppe Lorenzano, Gaetano Valastro, Federico G A Vagliasindi
The potential ability of microwave heating (MWH) for the remediation of marine sediments affected by severe hydrocarbon (HC) contamination was investigated. Decontamination effectiveness and environmental sustainability through a comparative Life Cycle Assessment (LCA) were addressed. Main results revealed that the application of a 650-W MWH treatment resulted in a rapid (15min) HC removal. A citric acid (CA) dose of 0.1M led to enhanced-HC removals of 76.9, 96.5 and 99.7% after 5, 10 and 15min of MW irradiation, respectively...
November 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29143704/identification-of-clostridium-difficile-reservoirs-in-the-patient-environment-and-efficacy-of-aerial-hydrogen-peroxide-decontamination
#4
Samuel Yui, Shanom Ali, Monika Muzslay, Annette Jeanes, A Peter R Wilson
OBJECTIVE To identify, using a novel enhanced method of recovery, environmental sites where spores of Clostridium difficile persist despite cleaning and hydrogen peroxide aerial decontamination. DESIGN Cohort study. SETTING Tertiary referral center teaching hospital. METHODS In total, 16 sites representing high-frequency contact or difficult-to-clean surfaces in a single-isolation room or bed area in patient bed bays were sampled before and after terminal or hydrogen peroxide disinfection using a sponge swab...
November 16, 2017: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/29136571/heavy-metal-remediation-with-ficus-microcarpa-through-transplantation-and-its-environmental-risks-through-field-scale-experiment
#5
Jie Luo, Limei Cai, Shihua Qi, Jian Wu, Xiaowen Sophie Gu
The phytoremediation efficiency of various metals by Ficus microcarpa was evaluated through a real scale experiment in the present study. The root biomass production of the species varied significantly from 3.68 to 5.43 g because of the spatial heterogeneity of different metals. It would take 4-93 years to purify the excess Cd of the experimental site. Mercury was the most inflexible element which can barely be phytoremediated by F. microcarpa. After the species transplanted from the polluted soil to the clean site, Cd and Cu were transferred to the rhizosphere soil to different extent while the bulk soil was barely influenced...
November 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/29136420/assessment-of-environmental-contamination-with-pathogenic-bacteria-at-a-hospital-laundry-facility
#6
Karen E Michael, David No, William E Daniell, Noah S Seixas, Marilyn C Roberts
Little is known about exposure to pathogenic bacteria among industrial laundry workers who work with soiled clinical linen. To study worker exposures, an assessment of surface contamination was performed at an industrial laundry facility serving hospitals in Seattle, WA, USA. Surface swab samples (n = 240) from the environment were collected during four site visits at 3-month intervals. These samples were cultured for Clostridium difficile, methicillin-resistant Staphylococcus aureus (MRSA), and vancomycin-resistant enterococci (VRE)...
November 10, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/29134754/a-decrease-in-the-abundance-and-strategic-sophistication-of-cleaner-fish-after-environmental-perturbations
#7
Zegni Triki, Sharon Wismer, Elena Levorato, Redouan Bshary
Coral reef ecosystems are declining worldwide and under foreseeable threat due to climate change, resulting in significant changes in reef communities. It is unknown, however, how such community changes impact interspecific interactions. Recent extreme weather events affecting the Great Barrier Reef, that is, consecutive cyclones and the 2016 El Niño event, allowed us to explore potential consequences in the mutualistic interactions involving cleaner fish Labroides dimidiatus (hereafter "cleaner"). After the perturbations, cleaner densities were reduced by 80%, disproportionally compared to the variety of reef fish clients from which cleaners remove ectoparasites...
November 14, 2017: Global Change Biology
https://www.readbyqxmd.com/read/29134675/analytical-approach-dissipation-pattern-and-risk-assessment-of-pesticide-residue-in-green-leafy-vegetables-a-comprehensive-review
#8
REVIEW
Waziha Farha, A M Abd El-Aty, Md Musfiqur Rahman, Ji Hoon Jeong, Ho-Chul Shin, Jing Wang, Sung Shik Shin, Jae-Han Shim
The category of "leafy vegetables" comprises a wide range of plants, including cabbage, lettuce, leeks, spinach, Swiss chard, and kale, and it forms a significant component of the human diet. Typically, leafy vegetables are low in calories and fat, are great sources of vitamins, protein, dietary fibre, minerals (including iron, calcium, and nitrates), and are rich in phytochemicals. To counter the impact of pests on vegetables, a broad variety of pesticides is used. Because of their large surface areas, leafy vegetables are expected to have high residual pesticide levels...
November 14, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29133792/controlled-synthesis-of-conjugated-polycarbazole-polymers-via-structure-tuning-for-gas-storage-and-separation-applications
#9
Guoyan Li, Long Qin, Chan Yao, Yanhong Xu
A series of conjugated microporous polymers (CMPs) based on 1,3,6,8-tetrabromocarbazole (N4CMP-1-5) is synthesized via Suzuki cross-coupling or Sonogashira polycondensation. The porosity properties and surface area of these polymer networks can be finely tuned by using a linker with different geometries or strut length. These polymers show the Brunauer-Emmett-Tellerthe (BET) surface areas ranging from 592 to 1426 m(2) g(-1). The dominant pore sizes of the polymers on the basis of the different linker are located between 0...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29128768/contaminated-land-in-colombia-a-critical-review-of-current-status-and-future-approach-for-the-management-of-contaminated-sites
#10
REVIEW
Victor Andres Arias Espana, Alfonso R Rodriguez Pinilla, Paul Bardos, Ravi Naidu
Environmental contaminants can have negative effects on human health and land, air and water resources. Consequently, there have been significant advances in regulation for protecting the environment in developed countries including the development of remediation frameworks and guidelines. On the other hand, fewer studies have been reported on the risks and health effects of contaminants in developing regions and there is scarce information regarding contaminated land assessment and environmental remediation...
November 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29126084/a-simple-and-highly-selective-molecular-imprinting-polymer-based-methodology-for-propylparaben-monitoring-in-personal-care-products-and-industrial-waste-waters
#11
Ana Vicario, Leslie Aragón, Chien C Wang, Franco Bertolino, María R Gomez
In this work, a novel molecularly imprinted polymer (MIP) proposed as solid phase extraction sorbent was developed for the determination of propylparaben (PP) in diverse cosmetic samples. The use of parabens (PAs) is authorized by regulatory agencies as microbiological preservative; however, recently several studies claim that large-scale use of these preservatives can be a potential health risk and harmful to the environment. Diverse factors that influence on polymer synthesis were studied, including template, functional monomer, porogen and crosslinker used...
November 4, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29126062/habitat-fragmentation-caused-by-contaminants-atrazine-as-a-chemical-barrier-isolating-fish-populations
#12
Cristiano V M Araújo, Daniel C V R Silva, Luiz E T Gomes, Raphael D Acayaba, Cassiana C Montagner, Matilde Moreira-Santos, Rui Ribeiro, Marcelo L M Pompêo
Information on how atrazine can affect the spatial distribution of organisms is non-existent. As this effect has been observed for some other contaminants, we hypothesized that atrazine-containing leachates/discharges could trigger spatial avoidance by the fish Poecilia reticulata and form a chemical barrier isolating upstream and downstream populations. Firstly, guppies were exposed to an atrazine gradient in a non-forced exposure system, in which organisms moved freely among the concentrations, to assess their ability to avoid atrazine...
November 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/29125583/occurrences-of-organochlorine-pesticides-along-the-course-of-the-buffalo-river-in-the-eastern-cape-of-south-africa-and-its-health-implications
#13
Abdulrazaq Yahaya, Omobola O Okoh, Anthony I Okoh, Abiodun O Adeniji
Most organochlorine pesticides (OCPs) which are increasingly used in agriculture and industry are not biodegradable and thereby persist in the environment for a very long period of time. They are capable of negatively impacting the health of humans and biota when present in a higher concentration than recommended. This study evaluated the concentrations of 17 OCPs in surface water samples collected from six sampling sites along the course of the Buffalo River in Eastern Cape, South Africa, between December 2015 and May 2016...
November 10, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29121558/high-performance-and-versatile-electrochemical-aptasensor-based-on-self-supported-nanoporous-gold-microelectrode-and-enzyme-induced-signal-amplification
#14
Lei Shi, Xiaojiao Rong, Yan Wang, Shiming Ding, Wanying Tang
Herein, novel and versatile electrochemical aptasensors were constructed on a self-supported nanoporous gold (np-Au) microelectrode, integrating with an exonuclease III (Exo III) induced signal amplification strategy. Self-supported np-Au microelectrode with 3D bicontinuous nanoporous structures possesses tremendously large specific area, clean surface, high stability and biocompatibility, bringing about significant advantages in both molecular recognition and signal response. As paradigms, two analytes of bisphenol A (BPA) and ochratoxin A (OTA) were selected to demonstrate the superiority and versatility of designed aptasensors...
November 6, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29120796/a-rapid-and-simple-hplc-fld-screening-method-with-quechers-as-the-sample-treatment-for-the-simultaneous-monitoring-of-nine-bisphenols-in-milk
#15
Lin Xiong, Ping Yan, Min Chu, Ya-Qin Gao, Wei-Hong Li, Xiao-Ling Yang
A specific, precise and accurate high performance liquid chromatographic (HPLC) analytical method with a fluorescence detector (FLD) was established for the simultaneous determination of nine bisphenols (BPs) in milk samples. Samples were extracted ultrasonically with acetonitrile and cleaned using the QuEChERS technique. Under the optimized conditions, good linearity was obtained for the nine BPs and the correlation coefficients (R(2)) ranged from 0.9942 to 0.9997. Recovery values for the nine bisphenols in spiked samples were 75...
April 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29120378/clinic-design-as-placebo-using-design-to-promote-healing-and-support-treatments
#16
Jonas Rehn, Kai Schuster
Analogously to the medical placebo effect, people seem to anticipate the quality of treatments based on external stimuli. In order to gain insights on the effect the built environment can have on a person's judgments and behavior with a particular focus on health related issues, a quantitative survey (N = 851) with four groups before and after the renovation of a rehabilitation clinic has been conducted. In line with an overall modernization of the clinic, the entrance, the lobby, and some patient rooms have been changed...
November 9, 2017: Behavioral Sciences
https://www.readbyqxmd.com/read/29117114/climatic-variables-and-malaria-morbidity-in-mutale-local-municipality-south-africa-a-19-year-data-analysis
#17
Abiodun M Adeola, Joel O Botai, Hannes Rautenbach, Omolola M Adisa, Katlego P Ncongwane, Christina M Botai, Temitope C Adebayo-Ojo
The north-eastern parts of South Africa, comprising the Limpopo Province, have recorded a sudden rise in the rate of malaria morbidity and mortality in the 2017 malaria season. The epidemiological profiles of malaria, as well as other vector-borne diseases, are strongly associated with climate and environmental conditions. A retrospective understanding of the relationship between climate and the occurrence of malaria may provide insight into the dynamics of the disease's transmission and its persistence in the north-eastern region...
November 8, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29116744/transforming-a-simple-commercial-glue-into-highly-robust-superhydrophobic-surfaces-via-aerosol-assisted-chemical-vapor-deposition
#18
Aoyun Zhuang, Ruijin Liao, Yao Lu, Sebastian C Dixon, Arreerat Jiamprasertboon, Faze Chen, Sanjayan Sathasivam, Ivan P Parkin, Claire J Carmalt
Robust superhydrophobic surfaces were synthesized as composites of the widely commercially available adhesives epoxy resin (EP) and polydimethylsiloxane (PDMS). The EP layer provided a strongly adhered micro/nanoscale structure on the substrates, while the PDMS was used as a post-treatment to lower the surface energy. In this study, the depositions of EP films were taken at a range of temperatures, deposition times, and substrates via aerosol-assisted chemical vapor deposition (AACVD). A novel dynamic deposition temperature approach was developed to create multiple-layered periodic micro/nanostructures that significantly improved the surface mechanical durability...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29112842/occurrence-and-geodatabase-mapping-of-three-contaminants-of-emerging-concern-in-receiving-water-and-at-effluent-from-waste-water-treatment-plants-a-first-overview-of-the-situation-in-the-republic-of-ireland
#19
REVIEW
Alexandre Tahar, Erin Jo Tiedeken, Neil J Rowan
This constitutes the first study to address occurrence and geodatabase mapping of the anti-inflammatory drug diclofenac (DCL) and the natural (17-beta-estradiol or E2) and synthetic (17-alpha-ethynylestradiol or EE2) estrogenic hormones in Republic of Ireland receiving waters over the period 1999 to 2015. Among these data, 317 samples came from concentration studies, while 205 were from effect-based studies. Monitoring data came from 16 waste water treatment plants (WWTPs), 23 water bodies (including rivers, lakes, marine and transitional waters) and 7 from domestic locations...
November 4, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29112710/interventions-to-reduce-the-incidence-of-hospital-onset-clostridium-difficile-infection-an-agent-based-modeling-approach-to-evaluate-clinical-effectiveness-in-adult-acute-care-hospitals
#20
Anna K Barker, Oguzhan Alagoz, Nasia Safdar
Background: Despite intensified efforts to reduce hospital-onset Clostridium difficile infection (C. difficile; HO-CDI), its clinical and economic impacts continue to worsen. Many institutions have adopted bundled interventions that vary considerably in composition, strength of evidence, and effectiveness. Considerable gaps remain in our knowledge of intervention effectiveness and disease transmission, which hinders HO-CDI prevention. Methods: We developed an agent-based model of C...
November 3, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
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