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https://www.readbyqxmd.com/read/29783116/modelling-environment-contamination-with-heavy-metals-in-flathead-grey-mullet-mugil-cephalus-and-upper-sediments-from-north-african-coasts-of-the-mediterranean-sea
#1
Naouel Ouali, Bourhane-Eddine Belabed, Haroun Chenchouni
Heavy metals are a serious hazard for aquatic ecosystems and human health. They negatively affect aquatic life functioning through accumulation resulting physiological/growth disturbances in aquatic lifeforms. This survey focused on the assessment of heavy metal pollution in the Gulf of Annaba (northeastern Algeria), the largest and most diversified industrial hub in Africa, using a multi-compartment approach (water-sediment-biota). The study aims to characterize the spatiotemporal variation of trace metal (TM) contamination and its effects on the growth of the Flathead grey mullet (Mugil cephalus)...
May 18, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29783110/temporal-and-spatial-variation-in-the-mechanisms-used-by-microorganisms-to-form-methylmercury-in-the-water-column-of-changshou-lake
#2
Zhilin Xing, Tiantao Zhao, Weiyang Bai, Xu Yang, Shuai Liu, Lijie Zhang
The microbiome in artificial lake water and its impact on mercury (Hg) methylation remain largely unknown. We selected the largest artificial lake in southeastern china, Changshou Lake (CSL), which has high background levels of Hg, for our investigation of Hg transformation microorganisms. Five different sections of the water column of CSL were sampled during four seasons. The water samples were subjected to analysis of geochemical parameters, various Hg species and microbiome information. High concentrations of total mercury (THg) were detected in CSL in comparison with those found in natural lakes...
May 18, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29782897/metal-concentrations-in-fillet-and-gill-of-parrotfish-scarus-ghobban-from-the-persian-gulf-and-implications-for-human-health
#3
Yadolah Fakhri, Narottam Saha, Ali Miri, Aziz Rahimizadeh, Laleh Roomiani, Mansour Ghaderpoori, Mahmoud Taghavi, Hassan Keramati, Zohreh Bahmani, Bigard Moradi, Nazak Amanidaz
Despite the benefits of seafood's consumption, the bioaccumulation of metals in fish can endanger consumers' health. This study analyzed lead (Pb), mercury (Hg), Arsenic (As), and Cadmium (Cd) concentrations in fillet and gill of parrotfish (Scarus ghobban) using flame atomic adsorption spectroscopy (FAAS). The potential non-carcinogenic and carcinogenic health risks due to consumption of Scarus ghobban fillet were assessed by estimating average target hazard quotient (THQ) and total target hazard quotient (TTHQ) and Incremental Lifetime Cancer Risk cancer risk (ILCR) of the analyzed metals...
May 18, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29778966/assessment-of-human-health-risk-associated-with-methylmercury-in-the-imported-fish-marketed-in-the-caribbean
#4
Fabio Fuentes-Gandara, Claudia Herrera-Herrera, José Pinedo-Hernández, José Marrugo-Negrete, Sergi Díez
The decline in marine and freshwaters catches in recent years in Colombia has led to a change in dietary habits, with an increase in the purchase and consumption of imported fish. This is of particular concern as fish are sometimes caught in mercury-contaminated waters, and are subsequently sold canned or uncanned. In addition, canned tuna has received little attention as it is widely assumed that concentrations are low. In this study, total mercury (THg) and methylmercury (MeHg) concentrations were evaluated in three imported fish species marketed in Colombia, Prochilodus lineatus, Prochilodus reticulatus, and Pangasianodon hypophthalmus, plus four brands of canned tuna and one of sardines...
May 17, 2018: Environmental Research
https://www.readbyqxmd.com/read/29778899/dopamine-loss-alters-the-hippocampus-nucleus-accumbens-synaptic-transmission-in-the-tg2576-mouse-model-of-alzheimer-s-disease
#5
Alberto Cordella, Paraskevi Krashia, Annalisa Nobili, Annabella Pignataro, Livia La Barbera, Maria Teresa Viscomi, Alessandro Valzania, Flavio Keller, Martine Ammassari-Teule, Nicola Biagio Mercuri, Nicola Berretta, Marcello D'Amelio
The functional loop involving the ventral tegmental area (VTA), dorsal hippocampus and nucleus accumbens (NAc) plays a pivotal role in the formation of spatial memory and persistent memory traces. In particular, the dopaminergic innervation from the VTA to the hippocampus is critical for hippocampal-related memory function and alterations in the midbrain dopaminergic system are frequently reported in Alzheimer's disease (AD), contributing to age-related decline in memory and non-cognitive functions. However, much less is known about the hippocampus-NAc connectivity in AD...
May 17, 2018: Neurobiology of Disease
https://www.readbyqxmd.com/read/29778445/calixarene-immobilized-monolithic-cryogels-for-preparative-protein-chromatography
#6
Idris Guven, Orhan Gezici, Mevlut Bayrakci, Massimo Morbidelli
New cation exchanger monolithic stationary phases were prepared by immobilization of three different calixarene derivatives (i.e. tetracarboxylate calix[4]arene, CLX-COO, tetrasulfonate calix[4]arene, CLX-SO3 , and tetraphosphonate calix[4]arene, CLX-PO4 ) onto a monolithic cryogel support (i.e. poly(2-hydroksyethylmethacrilate-co-glycidyl methacrylate, P) and investigated with respect to preparative protein chromatography. The obtained monoliths were characterized through various techniques such as FTIR spectroscopy, isoelectric point measurements, titrimetric analyses, and mercury intrusion porosimetry...
May 16, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29778308/meeting-report-of-the-regulatory-exchange-matters-session-at-the-5th-international-treat-nmd-conference-lessons-in-communication-how-an-early-dialogue-between-patients-regulators-and-academics-can-further-therapy-development-for-neuromuscular-disorders-freiburg
#7
https://www.readbyqxmd.com/read/29777524/mercury-involvement-in-neuronal-damage-and-in-neurodegenerative-diseases
#8
REVIEW
Veronica Lanza Cariccio, Annalisa Samà, Placido Bramanti, Emanuela Mazzon
Neurodegenerative diseases such as Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, and multiple sclerosis are characterized by a chronic and selective process of neuronal cell death. Although the causes of neurodegenerative diseases remain still unknown, it is now a well-established idea that more factors, such as genetic, endogenous, and environmental, are involved. Among environmental causes, the accumulation of mercury, a heavy metal considered a toxic agent, was largely studied as a probable factor involved in neurodegenerative disease course...
May 18, 2018: Biological Trace Element Research
https://www.readbyqxmd.com/read/29775854/a-wavelength-modulated-localized-surface-plasmon-resonance-lspr-optical-fiber-sensor-for-sensitive-detection-of-mercury-ii-ion-by-gold-nanoparticles-dna-conjugates
#9
Shuo Jia, Chao Bian, Jizhou Sun, Jianhua Tong, Shanhong Xia
The study presented herein investigated an easy preparation, high performance, wavelength-modulated LSPR optical fiber chemosensor coated by gold nanospheres(AuNS) for Hg2+ detection based on thymine-Hg2+ -thymine base pair mismatches and the coupled plasmonic resonance effect.Utilizing electrostatic self-assembly method, the high density and dispersivity monolayer AuNS coated LSPR fiber sensor had the near field refractive index sensitivity up to 2016 nm/RIU. The single-strand probe DNA served as a binding element for free AuNS labelled-target DNA conjugates was attached to the monolayer AuNS by Au-S bond...
May 8, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29773924/mercury-in-the-diatoms-of-various-ecological-formations
#10
Magdalena Bełdowska, Aleksandra Zgrundo, Justyna Kobos
Mercury is a neurotoxin, its main source in the human organism being fish and seafood. The first level in the marine food web is formed of planktonic and benthic photosynthetic microorganisms, which form a biofilm on the surface of the hard bottom (epilithon) or plants (epiphyton). They are carriers of nutritional as well as toxic substances and pass these on to subsequent levels of the trophic web. Their biomass is often dominated by diatoms. This was the basis for the presented study into Hg accumulation in epilithic, epiphytic and planktonic diatoms, which was carried out in 2012-2013 in the coastal zone of the Puck Lagoon and the Gulf of Gdańsk (southern Baltic)...
2018: Water, Air, and Soil Pollution
https://www.readbyqxmd.com/read/29773181/mercury-and-selenium-in-fishes-from-the-tapaj%C3%A3-s-river-in-the-brazilian-amazon-an-evaluation-of-human-exposure
#11
A S Lino, D Kasper, Y S Guida, J R Thomaz, O Malm
This work aimed to evaluate associated risks of fish consumption to human health, concerning mercury (Hg) and selenium (Se) concentrations in fish species largely consumed in the Tapajós River basin in the Brazilian Amazon. Total mercury (THg), methylmercury (MeHg) and Se concentrations were measured in 129 fish specimens from four sites of the Tapajós River basin. Estimated daily intake (EDI) of Hg and Se were reported regarding fish consumption. EDI were compared with the reference value of provisional tolerable daily intake proposed by the World Health Organization (WHO)...
July 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29772808/mercury-levels-in-women-and-children-from-interior-villages-in-suriname-south-america
#12
Paul E Ouboter, Gwendolyn Landburg, Gaitrie U Satnarain, Sheryl Y Starke, Indra Nanden, Bridget Simon-Friedt, William B Hawkins, Robert Taylor, Maureen Y Lichtveld, Emily Harville, Jeffrey K Wickliffe
Natural sources of mercury, historical gold mining, and contemporary artisanal and small-scale gold mining (ASGM) activities have led to mercury contamination in Suriname. Our primary objective was to evaluate mercury levels in hair of women and children from interior villages in Suriname where mercury levels in fish are elevated. We also estimated blood levels of mercury using an established mathematical conversion to facilitate comparison with other biomonitoring programs in the United States. Estimated levels of mercury in the blood of participants from Suriname were significantly higher than those in women from a heavy marine fish-consuming population in southeast Louisiana and estimates of the US national average...
May 17, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29772790/combined-effects-of-set-retarders-and-polymer-powder-on-the-properties-of-calcium-sulfoaluminate-blended-cement-systems
#13
Seongwoo Gwon, Seung Yup Jang, Myoungsu Shin
This study investigates the effects of set retarders on the properties of polymer-modified calcium sulfoaluminate (CSA) and Portland cement blend systems at early and long-term ages. The fast setting of the cement blend systems is typically adjusted by using retarders to ensure an adequate workability. However, how the addition of retarders influences the age-dependent characteristics of the cement blend systems was rarely investigated. This study particularly examines the effects of retarders on the microstructure and strength development of polymer-modified CSA and Portland cement blend pastes and mortars from 2 h to 90 days...
May 17, 2018: Materials
https://www.readbyqxmd.com/read/29772728/preparation-and-thermal-properties-of-molecular-bridged-expanded-graphite-polyethylene-glycol-composite-phase-change-materials-for-building-energy-conservation
#14
Dong Zhang, Meizhu Chen, Quantao Liu, Jiuming Wan, Jinxuan Hu
Using phase change materials (PCMs) in building envelopes became a reliable method to improve indoor comfort and reduce buildings' energy consumption. This research developed molecular-bridged expanded graphite (EG)/polyethylene glycol (PEG) composite PCMs (m-EPs) to conserve energy in buildings. The m-EPs were prepared through a vacuum absorption technique, and a titanate coupling agent was used to build a molecular bridge between EG and PEG. SEM, mercury intrusion porosimetry (MIP), the leakage test, microcalorimetry, X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FT-IR) were conducted to characterize the morphology, pore structure, absorbability, and modifying effects of the m-EPs...
May 16, 2018: Materials
https://www.readbyqxmd.com/read/29772512/distribution-and-speciation-of-mercury-affected-by-humic-acid-in-mariculture-sites-at-the-pearl-river-estuary
#15
Lingyun Ding, Kaiyun Zhao, Lijuan Zhang, Peng Liang, Shengchun Wu, Ming Hung Wong, Huchun Tao
At the Pearl River Estuary of southern China, mercury and its environmental problems have long been a great concern. This study investigated the distribution and speciation of mercury compounds that are significantly influenced by the increasing content of humic acid (HA, a model natural organic matter) in this region. The inorganic mercury and methyl mercury, being adsorbed and converted at different HA levels, were studied in sediments and surface water at both mariculture and their reference sites. In mariculture sediments with higher HA content (up to 4...
May 14, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29772375/duplex-functional-g-quadruplex-nmm-fluorescent-probe-for-label-free-detection-of-lead-ii-and-mercury-ii-ions
#16
Qian Zhu, Lanhua Liu, Yunpeng Xing, Xiaohong Zhou
To meet the severe water pollution status, multi-target biosensor becomes one of research focus. We herein report a novel duplex functional fluorescent biosensor for the label-free and separate detection of Pb2+ and Hg2+ with high sensitivity and selectivity. A K+ -induced fluorescent G-quadruplex probe was assembled by a guanine-rich sequence (AGRO100) and N-methyl mesoporphyrin IX(NMM). It changed into a more stably non-fluorescent G-quadruplex structure and a hairpin-like structure upon binding Pb2+ and Hg2+ ions, respectively...
May 1, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29772190/serum-metal-levels-in-maxillofacial-reconstructive-surgery-patients-a-pilot-study
#17
Louis G Mercuri, Michael Miloro, Anastasia K Skipor, Divya Bijukumar, Cortino Sukotjo, Mathew T Mathew
PURPOSE: The aim of this pilot study was to assay metal concentrations in the serum of patients who had undergone dental implant placement, orthognathic surgery using rigid metal fixation plates and screws, and total temporomandibular joint replacement (TMJ TJR). MATERIALS AND METHODS: Thirty patients were identified and included in this pilot study. Sixteen patients (9 men and 8 women), with an average age of 44 years (range, 19 to 79 yr), provided informed consent to participate and were divided into 3 study groups with 4 patients in each (group 1, orthognathic surgery; group 2, TMJ TJR; and group 3, dental implant placement)...
April 21, 2018: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29771257/characterization-of-mercury-binding-proteins-in-rat-blood-plasma
#18
Yiling Li, Bin He, Qiying Nong, Guangbo Qu, Lihong Liu, Jianbo Shi, Ligang Hu, Guibin Jiang
Mercury-binding protein profiles in rat plasma at different levels of mercury exposure in vitro and in vivo were systematically investigated using column gel electrophoresis coupled with inductively coupled plasma-mass spectrometry. The current finding provided various protein candidates that may play critical roles in mercury binding and transporting in plasma.
May 16, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29770935/insight-into-elemental-mercury-hg-0-removal-from-flue-gas-using-uv-h-2-o-2-advanced-oxidation-processes
#19
Changsong Zhou, Zijian Song, Hongmin Yang, Hao Wu, Ben Wang, Jie Yu, Lushi Sun
Elemental mercury (Hg0 ) emitted from coal-fired power plants and municipal solid waste (MSW) incinerators has caused great harm to the environment and human beings. The strong oxidized • OH radicals produced by UV/H2 O2 advanced oxidation processes were studied to investigate the performance of Hg0 removal from simulated flue gases. The results showed that when H2 O2 concentration was 1.0 mol/L and the solution pH value was 4.1, the UV/H2 O2 system had the highest Hg0 removal efficiency. The optimal reaction temperature was approximately 50 °C and Hg0 removal was inhibited when the temperature was higher or lower...
May 16, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29770934/total-and-methyl-mercury-seasonal-particulate-fluxes-in-the-water-column-of-a-large-lake-lake-geneva-switzerland
#20
Elena Gascón Díez, Neil D Graham, Jean-Luc Loizeau
Concentrations and fluxes of total and methylmercury were determined in surface sediments and associated with settling particles at two sites in Lake Geneva to evaluate the sources and dynamics of this toxic contaminant. Total mercury concentrations measured in settling particles were different throughout the seasons and were greatly influenced by the Rhone River particulate inputs. Total mercury concentrations closer to shore (NG2) ranged between 0.073 ± 0.001 and 0.27 ± 0.01 μg/g, and between 0...
May 16, 2018: Environmental Science and Pollution Research International
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