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https://www.readbyqxmd.com/read/28528504/assessment-of-trace-metal-accumulation-in-native-mussels-brachidontes-rodriguezii-from-a-south-american-temperate-estuary
#1
Natalia Sol Buzzi, Ana Laura Oliva, Andrés Hugo Arias, Jorge Eduardo Marcovecchio
The present work provides the first results in heavy metal bioaccumulation in the autochthonous mussel Brachidontes rodriguezii from the Bahía Blanca Estuary (Argentina), one of the most important coastal environments of South America, subjected to different anthropogenic pressure. The study is based on the detection of Cd, Cu, Pb, Mn, and Fe in mussels' soft tissue and sediments' fine fraction by means of inductively coupled plasma atomic emission spectroscopy (ICP-OES), in order to analyze the potential relationship between both components of the aquatic system...
May 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28528502/influence-of-amendments-on-cd-and-zn-uptake-and-accumulation-in-rice-oryza-sativa-l-in-contaminated-soil
#2
Patompong Saengwilai, Weeradej Meeinkuirt, John Pichtel, Preeyaporn Koedrith
Cadmium is a toxic metallic element that poses serious human health risks via consumption of contaminated agricultural products. The effect of mixtures of dicalcium phosphate and organic amendments, namely cow manure (MD) and leonardite (LD), on Cd and Zn uptake of three rice cultivars (KDML105, KD53, and PSL2) was examined in mesocosm experiments. Plant growth, Cd and Zn accumulation, and physicochemical properties of the test soils were investigated before and after plant harvest. Amendment application was found to improve soil physicochemical properties; in particular, soil organic matter content and nutrient (N, P, K, Ca, and Mg) concentrations increased significantly...
May 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28528500/using-poly-glutamic-acid-as-soil-washing-agent-to-remediate-heavy-metal-contaminated-soils
#3
Zong-Han Yang, Cheng-Di Dong, Chiu-Wen Chen, Yih-Terng Sheu, Chih-Ming Kao
The extraction efficiency of heavy metals from soils using three forms of gamma poly-glutamic acid (γ-PGA) as the washing agents was investigated. Controlling factors including agent concentrations, extraction time, pH, and liquid to soil ratio were evaluated to determine the optimum operational conditions. The distribution of heavy metal species in soils before and after extraction processes was analyzed. Up to 46 and 74% of heavy metal removal efficiencies were achieved with one round and a sequential extraction process using H-bonding form of γ-PGA (200 mM) with washing time of 40 min, liquid to solid ratio of 10 to 1, and pH of 6...
May 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28528485/lead-and-arsenic-accumulation-and-its-effects-on-plasma-cortisol-levels-in-oreochromis-sp
#4
Nguyen Quoc Thang, Bui The Huy, Le Van Tan, Nguyen Thi Kim Phuong
The accumulation, elimination and effect of heavy metals on plasma cortisol levels in Oreochromis sp. were studied in the exposure and recovery phases. In the exposure phase, the mean rate of accumulation in the tissues was in the order gill > liver > muscle for Pb exposure and muscle > liver > gill for As exposure. In the recovery phase, the order of elimination in the tissues was gill > liver > muscle for Pb and liver > gill > muscle for As. The amount of cortisol secreted by the Oreochromis sp...
May 20, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28528410/comparison-of-toxicities-of-metal-pyrithiones-including-their-degradation-compounds-and-organotin-antifouling-biocides-to-the-japanese-killifish-oryzias-latipes
#5
Madoka Ohji, Hiroya Harino
Japanese killifish Oryzias latipes were exposed to three levels (0, 1, and 10 µg l(-1)) of copper pyrithione (CuPT2), zinc pyrithione (ZnPT2), six of their degradation products, and the organotin compounds tributyltin (TBT) and triphenyltin (TPT) for 48 h at 20 °C. All individual fish exposed to 1 and 10 µg l(-1) of CuPT2 or 10 µg l(-1) of ZnPT2 were dead within 12 h, respectively, and at 24 h the survival rate of the fish exposed to 1 µg l(-1) of ZnPT2 was 50%. All fish exposed to 10 µg l(-1) of ZnPT2 showed morphological abnormalities in the form of vertebral deformity...
May 20, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28528317/levels-of-blood-lead-in-griffon-vultures-from-a-wildlife-rehabilitation-center-in-spain
#6
Fernando González, Irene López, Laura Suarez, Virginia Moraleda, Casilda Rodríguez
Lead is considered a highly toxic contaminant with important impacts to bird wildlife. Griffon vultures (Gyps fulvus) are a sensitive indicator of the level of environmental contamination due to their position at the top of the food chain and their dependence on human activities. The aim of this study was to assess susceptibility to lead intoxication in Griffon vultures admitted to Wildlife Rehabilitation Centers (WRC), measuring blood lead levels and determining if blood lead concentrations are related to clinical signs, hematological, biochemical or radiographic findings...
May 18, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28528263/influences-of-land-use-and-antecedent-dry-weather-period-on-pollution-level-and-ecological-risk-of-heavy-metals-in-road-deposited-sediment
#7
Jin Zhang, Pei Hua, Peter Krebs
Road-deposited sediment and its adsorbed pollutants have been regarded as significant sources of urban diffuse pollution. In this study, the solid-phase concentrations (mg/g), surface load (mg/m(2)) and chemical fractionation of zinc (Zn), copper (Cu) and cadmium (Cd) were determined. Geo-accumulation (Igeo) and ecological risk (RI) indexes were employed for metal risk assessment. Results show that the highest solid-phase concentrations of Zn and Cu were usually found at an industrial area. However, Cd had the highest solid-phase concentrations at a rural area, followed by a commercial area...
May 18, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28528262/stable-isotope-tracing-of-ni-and-cu-pollution-in-north-east-norway-potentials-and-drawbacks
#8
Hana Šillerová, Vladislav Chrastný, Martina Vítková, Anna Francová, Jan Jehlička, Marissa R Gutsch, Jana Kocourková, Paul E Aspholm, Lars O Nilsson, Tore F Berglen, Henning K B Jensen, Michael Komárek
The use of Ni and Cu isotopes for tracing contamination sources in the environment remains a challenging task due to the limited information about the influence of various biogeochemical processes influencing stable isotope fractionation. This work focuses on a relatively simple system in north-east Norway with two possible endmembers (smelter-bedrock) and various environmental samples (snow, soil, lichens, PM10). In general, the whole area is enriched in heavy Ni and Cu isotopes highlighting the impact of the smelting activity...
May 18, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28528260/hexavalent-chromium-induced-oxidative-stress-and-apoptosis-in-pycnoporus-sanguineus
#9
Mi Feng, Hua Yin, Hui Peng, Zehua Liu, Guining Lu, Zhi Dang
White rot fungi have been proved to be a promising option for the removal of heavy metals, understanding their toxic response to heavy metals is conducive to developing and popularizing fungi-based remediation technologies so as to lessen the hazard of heavy metals. In this study, Cr(VI)-induced oxidative stress and apoptosis in Pycnoporus sanguineus, a species of white rot fungi were investigated. The results suggested that high level of Cr(VI) promoted the formation of ROS, including H2O2, O2(•-) and ·OH...
May 18, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28527991/lignosulfonate-stabilized-selenium-nanoparticles-and-their-deposition-on-spherical-silica
#10
Anna Modrzejewska-Sikorska, Emilia Konował, Łukasz Klapiszewski, Grzegorz Nowaczyk, Stefan Jurga, Teofil Jesionowski, Grzegorz Milczarek
We report a novel room-temperature synthesis of selenium nanoparticles, which for the first time uses lignosulfonate as a stabilizer. Various lignosulfonates obtained both from hardwood and softwood were tested. Selenium oxide was used as the precursor of zero-valent selenium. Three different reducers were tested - sodium borohydride, hydrazine and ascorbic acid - and the latter proved most effective in terms of the particle size and stability of the final colloid. The lignosulfonate-stabilized selenium nanoparticles had a negative zeta potential, dependent on pH, which for some lignosulfonates reached -50mV, indicating the excellent stability of the colloid...
May 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28527989/the-effect-of-ph-on-the-bonding-of-cu-2-and-chitosan-montmorillonite-composite
#11
Chao Hu, Guoyuan Li, Yiyu Wang, Fengyi Li, Guangguang Guo, Hongqing Hu
Based on the contradict statements on the mechanisms of the bonding between metal ions and chitosan based adsorbent, this paper present studies on the Cu(2+) adsorption by the chitosan-montmorillonite composite. The in situ attenuated total reflectance Fourier transform infrared spectroscopy and two dimensional correlation analysis were used to record the spectra during the adsorption and the pH perturbation, and analyze the interaction sequence of the groups related to the adsorption, respectively. The results showed that the bonding with -NH3(+) might attribute the adsorption capacity greater than that with hydroxyl...
May 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28527978/enhanced-antimony-v-removal-using-synergistic-effects-of-fe-hydrolytic-flocs-and-ultrafiltration-membrane-with-sludge-discharge-evaluation
#12
Baiwen Ma, Xing Wang, Ruiping Liu, Zenglu Qi, William A Jefferson, Huachun Lan, Huijuan Liu, Jiuhui Qu
The integration of adsorbents with ultrafiltration (UF) membranes is a promising method for alleviating membrane fouling and reducing land use. However, a number of problems have become apparent concerning the granular adsorbents used currently, such as high running cost, high chance of causing membrane surface damage, low in situ chemical cleaning efficiency, etc. Herein, to overcome these disadvantages, loose in situ hydrolyzed flocs were directly injected into the membrane tank, providing strong adsorption ability at low cost...
May 13, 2017: Water Research
https://www.readbyqxmd.com/read/28527974/the-effect-of-%C3%AE-sheet-breaker-peptides-on-metal-associated-amyloid-%C3%AE-peptide-aggregation-process
#13
F Stellato, Z Fusco, R Chiaraluce, V Consalvi, S Dinarelli, E Placidi, M Petrosino, G C Rossi, V Minicozzi, S Morante
Far-UV Circular Dichroism experiments and Atomic Force Microscopy tomography are employed to assess the impact of β-sheet breakers on the Aβ1-40 peptide aggregation process in the presence of Cu(2+) or Zn(2+) transition metals. In this work we focus on two specific 5-amino acids long β-sheet breakers, namely the LPFFD Soto peptide, already known in the literature, and the LPFFN peptide recently designed and studied by our team. We provide evidence that both β-sheet breakers are effective in reducing the Aβ1-40 aggregation propensity, even in the presence of metal ions...
May 15, 2017: Biophysical Chemistry
https://www.readbyqxmd.com/read/28527917/spatial-distribution-of-vanadium-and-microbial-community-responses-in-surface-soil-of-panzhihua-mining-and-smelting-area-china
#14
Xuelong Cao, Muhe Diao, Baogang Zhang, Hui Liu, Song Wang, Meng Yang
Spatial distribution of vanadium in surface soils from different processing stages of vanadium-bearing titanomagnetite in Panzhihua mining and smelting area (China) as well as responses of microbial communities including bacteria and fungi to vanadium were investigated by fieldwork and laboratory incubation experiment. The vanadium contents in this region ranged from 149.3 to 4793.6 mg kg(-1), exceeding the soil background value of vanadium in China (82 mg kg(-1)) largely. High-throughput DNA sequencing results showed bacterial communities from different manufacturing locations were quite diverse, but Bacteroidetes and Proteobacteria were abundant in all samples...
May 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28527916/cadmium-stimulates-metastasis-associated-phenotype-in-triple-negative-breast-cancer-cells-through-integrin-and-%C3%AE-catenin-signaling
#15
Zhengxi Wei, Zahir A Shaikh
Cadmium (Cd) is a carcinogenic heavy metal which is implicated in breast cancer development. While the mechanisms of Cd-induced breast cancer initiation and promotion have been studied, the molecular processes involved in breast cancer progression remain to be investigated. The purpose of the present study was to evaluate the influence of Cd on metastasis-associated phenotypes, such as cell adhesion, migration, and invasion in triple-negative breast cancer cells. Treatment of MDA-MB-231 cells with 1μM Cd increased cell spreading and cell migration...
May 17, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28527910/radiative-decay-engineering-8-coupled-emission-microscopy-for-lens-free-high-throughput-fluorescence-detection
#16
Liangfu Zhu, Ramachandram Badugu, Douguo Zhang, Ruxue Wang, Emiliano Descrovi, Joseph R Lakowicz
Fluorescence spectroscopy and imaging are now used throughout the biosciences. Fluorescence microscopes, spectrofluorometers, microwell plate readers and microarray imagers all use multiple optical components to collect, redirect and focus the emission onto single point or array imaging detectors. For almost all biological samples, except those with regular nanoscale features, emission occurs in all directions. With the exception of complex microscope objectives with large collection angles (NA ≤ 0.5), all these instruments collect only a small fraction of the total emission...
May 17, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/28527853/influence-of-intracanal-materials-in-vertical-root-fracture-pathway-detection-with-cone-beam-computed-tomography
#17
Kamile Leonardi Dutra, Camila Pachêco-Pereira, Eduardo Antunes Bortoluzzi, Carlos Flores-Mir, Manuel O Lagravère, Márcio Corrêa
INTRODUCTION: Investigating the vertical root fracture (VRF) pathway under different clinical scenarios may help to diagnose this condition properly. We aimed to determine the capability and intrareliability of VRF pathway detection through cone-beam computed tomographic (CBCT) imaging as well as analyze the influence of different intracanal and crown materials. METHODS: VRFs were mechanically induced in 30 teeth, and 4 clinical situations were reproduced in vitro: no filling, gutta-percha, post, and metal crown...
May 17, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28527742/bio-monitoring-of-metal-impact-on-metallothioneins-levels-in-the-gastropod-phorcus-turbinatus-born-1778-in-the-northeastern-and-the-eastern-coasts-of-tunisia
#18
Wafa Boulajfene, Evangelia Strogyloudi, Catsiki Vassiliki-Angelique, Ammar El Mlayah, Sabiha Tlig-Zouari
This work is an evaluation of metal contamination degree in Phorcus turbinatus and a monitoring of metals impact on metallothioneins functioning. The gastropod was sampled from six stations along the northeastern and eastern coasts of Tunisia during four seasons (2014-2015). Our results suggested that sedimentological metallic contents (Copper, Zinc and Cadmium) vary significantly depending on stations and not significantly according to seasons except for copper. Nevertheless, differences were no significant between stations and significant between seasons as for ambient factors, metallic intrinsic contents and metallothioneins rates...
May 17, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28527712/insulin-fibrillation-the-influence-and-coordination-of-zn-2
#19
Christian Grundahl Frankær, Pernille Sønderby, Maria Blanner Bang, Ramona Valentina Mateiu, Minna Groenning, Jens Bukrinski, Pernille Harris
Protein amyloid fibrillation is obtaining much focus because it is connected with amyloid-related human diseases such as Alzheimer's disease, diabetes mellitus type 2, or Parkinson's disease. The influence of metal ions on the fibrillation process and whether it is implemented in the amyloid fibrils has been debated for some years. We have therefore investigated the influence and binding geometry of zinc in fibrillated insulin using extended X-ray absorption fine-structure and X-ray absorption near-edge structure spectroscopy...
May 17, 2017: Journal of Structural Biology
https://www.readbyqxmd.com/read/28527595/metal-dielectric-transition-in-sn-intercalated-graphene-on-sic-0001
#20
Y R Niu, A A Zakharov, R Yakimova
The Sn intercalation into a buffer layer graphene grown on 4H-SiC(0001) substrate has been studied with spectroscopic photoemission and low energy electron microscope. Both SnSix and SnOx interfacial layers are found to form below the buffer layer, converting it into a quasi-free-standing monolayer graphene. Combining the various operation modes of the microscope allows a detailed insight into the formation processes of the interlayers and their thermal stability. In particular, at the interface we observed a reversible transition from silicide to oxide after exposure to ambient pressure and subsequent annealing...
May 10, 2017: Ultramicroscopy
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