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https://www.readbyqxmd.com/read/28448930/determining-equilibrium-partition-coefficients-between-lipid-protein-and-polydimethylsiloxane-for-highly-hydrophobic-organic-contaminants-using-preloaded-disks
#1
Yuanyuan Pei, Huizhen Li, Jing You
Bioaccumulation of hydrophobic organic contaminants is of great concern and understanding their partitioning to biological phases is crucial for estimating their bioaccumulation potential. The estimation, however, was of large uncertainty for highly hydrophobic organic contaminants (HHOCs) with log KOW>9 due to the challenge of quantifying their water concentrations. In the present study, partition coefficients between polydimethylsiloxane (PDMS) and storage lipid (KSL,PDMS), membrane lipid (KML,PDMS) and protein (Kpro,PDMS) were measured for 21 polychlorinated biphenyls (PCBs), 14 polybrominated diphenyl ethers (PBDEs), dechlorane plus (DP) and decabromodiphenyl ethane (DBDPE), covering log KOW from 5...
April 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28447232/distribution-seasonal-variation-and-inhalation-risks-of-polychlorinated-dibenzo-p-dioxins-and-dibenzofurans-polychlorinated-biphenyls-and-polybrominated-diphenyl-ethers-in-the-atmosphere-of-beijing-china
#2
Yanfen Hao, Yingming Li, Thanh Wang, Yongbiao Hu, Huizhong Sun, Julius Matsiko, Shucheng Zheng, Pu Wang, Qinghua Zhang
Spatial distribution, seasonal variation and potential inhalation risks of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) were investigated in the atmosphere of Beijing, using passive air samplers equipped with polyurethane foam disks. Concentrations of ΣPCDD/Fs, ΣPCBs and ΣPBDEs ranged from 8.4 to 179 fg WHO2005-TEQ/m(3), 38.6-139 and 1.5-176 pg/m(3), respectively. PCDFs showed higher air concentrations than those of PCDDs, indicating the influence of industrial activities and other combustion processes...
April 26, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28444994/induction-of-micronuclei-and-cell-cycle-arrest-by-some-tri-and-tetrachlorobiphenyls-in-mammalian-cells-deficient-in-xenobiotic-metabolizing-enzymes
#3
Haiyan Wang, Liwen Wei, Yifan Wu, Hansi Jia, Hao Jiang, Yungang Liu
Polychlorinated biphenyls (PCBs) are persistent organic pollutants with continued public health concerns. The lower chlorinated biphenyls are supposed to be mutagenic following metabolic activation. However, in a preliminary study, we recently observed induction of micronuclei by several PCBs in a subclone of Chinese hamster V79 cell line, V79-Mz, which is deficient in xenobiotic-metabolizing enzyme activities. In this study, metabolism-free genotoxicity of PCBs was investigated, using 10 tri- and tetrachlorobiphenyls, in V79, V79-Mz, and human hepatoma (HepG2) cell lines...
May 2017: Environmental and Molecular Mutagenesis
https://www.readbyqxmd.com/read/28444511/scale-dependence-in-polychlorinated-biphenyl-pcb-exposure-effects-on-waterbird-habitat-occupancy
#4
James P Gibbs, Shahrokh Rouhani, Leyla Shams
Spatial scale is rarely considered in population-level assessments of contaminant impacts on wild animals; as a result misinterpretation of the relationship between contaminant exposure and population status may occur. We assessed the strength of expression of polychlorinated biphenyl (PCB) exposure effects at local vs. regional spatial scales on population status in five species of waterbirds, "bioaccumulators" often promoted as indicators of contaminant effects in aquatic ecosystems. Our focus was the upper Hudson River where PCBs occur at levels reported to have adverse impacts on wild birds...
April 25, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28441638/health-risk-assessment-for-the-consumption-of-fresh-and-preserved-fish-alosa-agone-from-lago-di-como-northern-italy
#5
Silvia Quadroni, Roberta Bettinetti
BACKGROUND: Although banned in many countries for decades, DDTs and PCBs still represent a global threat to food safety. As these contaminants are still present in aquatic ecosystems, fish can be an important contributor to their total dietary intake. OBJECTIVES: Alosa agone specimens were sampled over a period of 10 years (from 2006 to 2015) to provide a representative overview of the DDT and PCB levels of Lago di Como, a deep Italian lake where a DDT input due to secondary sources was observed in recent years...
April 22, 2017: Environmental Research
https://www.readbyqxmd.com/read/28441591/preliminary-study-of-possible-relationships-between-exposure-to-pcdd-fs-and-dl-pcbs-in-ambient-air-and-the-length-of-life-of-people
#6
Grzegorz Dziubanek, Ewa Marchwińska-Wyrwał, Małgorzata Ćwieląg-Drabek, Anna Spychała, Monika Rusin, Agata Piekut, Ilona Hajok
There is a lack of studies on the impact of very toxic and persistent organic compounds as polychlorinated dibenzodioxins (PCDDs), dibenzofurans (PCDFs) and polychlorinated biphenyls (PCBs) on the population life expectancy. Preliminary studies on the relations between exposure to PCDD/Fs and dl-PCBs in ambient air and the length of life of residents of 12 cities (2 million people) in the Silesia province has been undertaken. The average length of life of inhabitants in 12 cities of Silesia province was calculated on the basis of register of deaths after excluding deaths caused by external causes and the concentration of PCDD/Fs and dl-PCBs were measured...
April 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28438788/associations-between-persistent-organic-pollutants-type-2-diabetes-diabetic-nephropathy-and-mortality
#7
Brian A Grice, Robert G Nelson, Desmond E Williams, William C Knowler, Clinton Mason, Robert L Hanson, Kai McKeever Bullard, Meda E Pavkov
OBJECTIVE: Relationships were examined between persistent organic pollutants (POPs) and incident type 2 diabetes, end-stage renal disease (ESRD) and mortality. METHODS: In a nested case-control study, 300 persons without diabetes had baseline examinations between 1969 and 1974; 149 developed diabetes (cases) and 151 remained non-diabetic (controls) during 8.0 and 23.1 years of follow-up, respectively. POPs were measured at baseline. ORs for diabetes were computed by logistic regression analysis...
April 24, 2017: Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28437648/assessing-soil-air-partitioning-of-pahs-and-pcbs-with-a-new-fugacity-passive-sampler
#8
Carey E Donald, Kim A Anderson
Soil-air fluxes of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) were determined using a novel application of passive samplers to measure air and soil air, which is air in close proximity and in equilibrium with soil. Existing methods to measure flux of semi-volatile compounds between soil and air require collecting samples from the top soil layer. Yet, the top soil layer is hard to define and oversampling may misrepresent the exchangeable fraction. Alternatively, modified active samplers can measure soil air in situ, but require electricity while deployed...
April 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28434662/paclitaxel-coated-balloons-for-the-treatment-of-symptomatic-central-venous-stenosis-in-dialysis-access-results-from-a-randomized-controlled-trial
#9
Panagiotis M Kitrou, Panagiotis Papadimatos, Stavros Spiliopoulos, Konstantinos Katsanos, Nicolaos Christeas, Elias Brountzos, Dimitrios Karnabatidis
PURPOSE: To compare the clinically-assessed intervention-free period (IFP) of paclitaxel-coated balloon (PCB) vs conventional balloon angioplasty (CBA) for the treatment of symptomatic central venous stenosis (CVS) in dialysis access. MATERIALS AND METHODS: Within 20 months, 40 dialysis patients (19/40 arteriovenous fistulae [AVFs] and 21/40 arteriovenous grafts [AVGs]) were randomized to undergo angioplasty either with a PCB (PCB group, n = 20; 14/20 male; age: 56...
April 20, 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/28433818/spatial-temporal-variability-and-transportation-mechanism-of-polychlorinated-biphenyls-in-the-yangtze-river-estuary
#10
Lei Chen, Ye Yang, Jing Chen, Shuohan Gao, Shasha Qi, Cheng Sun, Zhenyao Shen
Although the variability of polychlorinated biphenyls (PCBs) is strongly dependent on the hydro-sediment pattern, the quantification of this interaction is still not well described, especially for estuary areas. In this study, both chemical analyses and numerical simulation were conducted to explain the temporal-spatial variability and transportation mechanism of PCBs in the Yangtze River Estuary (YRE). The impacts of the upstream Three Gorges Dam (TGD) on estuarine PCBs were also addressed with a simulated scenario...
April 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28432906/hydrophobic-and-hydrophilic-properties-of-pollutants-as-a-factor-influencing-their-redistribution-during-snowpack-melt
#11
Krystyna Kozioł, Katarzyna Kozak, Żaneta Polkowska
Glaciers accumulate organic pollutants delivered by snow. However, our understanding of the exact dynamics of organic pollutants in the snowpack relies primarily on laboratory experiments and mathematical models. To fill the gap related to the detailed field data, we have conducted observations of melting snow profiles in two locations and three different stages of melting on one High Arctic glacier, as well as in superimposed ice. We monitored the chemical concentrations of formaldehyde, phenols, short-chain carboxylic acids, polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) and snow water equivalents to derive chemical loads...
April 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28432879/seasonal-variation-and-health-risk-assessment-of-organochlorine-compounds-in-urban-soils-of-novi-sad-serbia
#12
Biljana D Škrbić, Vesna Marinković, Igor Antić, Anita Petrović Gegić
The aim of this paper was to determine spatial and seasonal variation of 6 indicator polychlorinated biphenyls (PCBs) and 18 organochlorine pesticides (OCPs) in urban soils of Novi Sad, Serbia. Sixty surface soil samples were collected during both winter and summer season, from different types of locations: schools, recreational areas, residential and industrial zones. Samples were treated using the method of accelerated solvent extraction, which allows simultaneous extraction and clean up of PCBs and OCPs...
April 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/28432626/temporal-trends-of-lipophilic-persistent-organic-pollutants-in-serum-from-danish-nulliparous-pregnant-women-2011-2013
#13
Christian Bjerregaard-Olesen, Manhai Long, Mandana Ghisari, Bodil H Bech, Ellen A Nohr, Niels Uldbjerg, Tine B Henriksen, Jørn Olsen, Eva C Bonefeld-Jørgensen
The use of the lipophilic persistent organic pollutants (POPs) including polychlorinated biphenyls (PCBs) and several organochlorine pesticides (OCPs) has been prohibited for more than 30 years. In this study, we present the temporal trends of the lipophilic POP serum concentrations in Danish nulliparous pregnant women between 2011 and 2013. We randomly selected 197 pregnant women (gestational age 11-13) from the Aarhus Birth Cohort. The concentrations of the lipophilic POPs in the serum samples were analyzed using gas chromatography...
April 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28431184/congener-specific-disposition-of-chiral-polychlorinated-biphenyls-in-lactating-mice-and-their-offspring-implications-for-pcb-developmental-neurotoxicity
#14
Izabela Kania-Korwel, Tracy Lukasiewicz, Christopher D Barnhart, Marianna Stamou, Haeun Chung, Kevin M Kelly, Stelvio Bandiera, Pamela J Lein, Hans-Joachim Lehmler
Chiral polychlorinated biphenyl (PCB) congeners have been implicated by laboratory and epidemiological studies in PCB developmental neurotoxicity. These congeners are metabolized by cytochrome P450 (P450) enzymes to potentially neurotoxic hydroxylated metabolites (OH-PCBs). The present study explores the enantioselective disposition and toxicity of two environmentally relevant, neurotoxic PCB congeners and their OH-PCB metabolites in lactating mice and their offspring following dietary exposure of the dam. Female C57BL/6N mice (8 weeks old) were fed daily, beginning two weeks prior to conception and continuing throughout gestation and lactation, with 3...
April 14, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28426942/polychlorinated-biphenyl-and-polybrominated-diphenyl-ether-profiles-in-serum-from-cattle-sheep-and-goats-across-california
#15
S Sethi, X Chen, P H Kass, B Puschner
It has been previously been shown by our lab and others that persistent organic pollutants, such as polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs), are contaminants in milk produced for human consumption. To further this research we determined the concentration of 21 PCB and 14 PBDE congeners in livestock serum, mainly bovine, across California. Congeners were extracted from serum using solid phase extraction (SPE), cleaned up by silica cartridge and quantified using gas chromatography-triple quadruple mass spectrometry...
April 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28421252/altitude-distributions-and-source-analysis-of-ocps-and-pcbs-in-surface-soils-of-changbai-mountain-northeast-china
#16
Xiaochun Wang, Shu Chen, Kuiyuan Wan, Xiaocai Yin, Xiaohua Zhu, Jing Pan, Yongliang Yang
Organochlorine pesticides and polychlorinated biphenyls in surface soils of Changbai Mountain, Northeastern China, have been quantified by gas chromatography with electron capture detector and the altitude distributions and possible pollution sources were analyzed. The concentrations of ∑HCHs, ∑DDTs and ∑7PCBs were in the range of 3.09-25.6, 0.96-19.4 and 7.32-26.1 ng/g dw, respectively. The concentration of α-HCH, β-HCH, p,p'-DDT, p,p'-DDE, PCB 101, 138, 153, and 180 showed increasing trends with altitude...
April 18, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28420543/serum-persistent-organic-pollutants-pops-and-prostate-cancer-risk-a-case-cohort-study
#17
Jung-Eun Lim, Chungmo Nam, Jiyeon Yang, Koon Ho Rha, Kyung-Min Lim, Sun Ha Jee
It is still unclear whether persistent organic pollutants (POPs) exposure increases the prostate cancer incidence risk. This prospective cohort study evaluated the associations between serum POPs concentrations and prostate cancer risk. Within a case-cohort study, we identified 110 people diagnosed with prostate cancer and randomly selected 256 sub-cohort participants without prostate cancer. Serum concentrations of 32 polychlorinated biphenyl (PCB) congeners and 19 organochlorine pesticides (OCPs) were measured...
April 10, 2017: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/28416887/a-preliminary-study-of-pcbs-pahs-pesticides-and-trace-metals-contamination-in-cold-pressed-rapeseed-oils-from-conventional-and-ecological-cultivations
#18
Małgorzata Wroniak, Agnieszka Rękas
The purpose of this study was to investigate the levels of polycyclic aromatic hydrocarbons [benzo(a)anthracene, chrysene, benzo(b)fluoranthene, and benzo(a)pyrene], polychlorinated biphenyls (6 marker and 12 dioxin-like), pesticides (74 compounds) and heavy metals (Pb, Cd, As, Hg, Fe, Cu), in the cold-pressed rapeseed oils from conventional (RC) and ecological cultivations (RE). Similar level of PAHs, PCBs and heavy metals was found in the investigated cold-pressed oils; moreover, no effect of rapeseeds cultivation practice on the level of pesticide residues was found...
April 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28416085/delamination-mechanism-study-of-large-size-waste-printed-circuit-boards-by-using-dimethylacetamide
#19
Himanshu Ranjan Verma, Kamalesh K Singh, Tilak Raj Mankhand
Present work investigates the recycling of waste printed circuit boards (PCBs) by cracking of its multi-layered structure by using dimethylacetamide (DMA). The study shows that cracking and separation of layers of PCBs increases as the temperature increases; and decreases as the surface area of PCBs increases. After separation of layers, the used solvent was analyzed by proton and carbon nuclear magnetic resonance spectroscopy (NMR) to understand the dissolution phenomenon of resin. Further, NMR and Fourier transform infrared spectroscopy analysis of DMA sample after 1h, 2h, 3h, 4h and 8h of reaction with PCBs at 433K and PCB:DMA ratio (wt/vol) of 3:10 has been carried out to investigate the mechanism of dissolution of resin...
April 13, 2017: Waste Management
https://www.readbyqxmd.com/read/28415042/determinants-of-increasing-serum-pops-in-a-population-at-high-risk-for-cardiovascular-disease-results-from-the-predimed-canarias-study
#20
Luis A Henríquez-Hernández, Octavio P Luzardo, Manuel Zumbado, Lluis Serra-Majem, Pilar F Valerón, María Camacho, Jacqueline Álvarez-Pérez, Jordi Salas-Salvadó, Luis D Boada
Persistent organic pollutants (POPs) are well-known ubiquitous environmental chemicals which have been related to adverse health outcomes, including cardiovascular disease (CVD). The purpose of this study was to evaluate POPs burden, and its determinants, in a population at high risk of suffering CVD enrolled in the PREDIMED Study (Spanish acronym for PREvention by means of MEDiterranean Diet). This cohort was formed by 343 participants (55-80 y.o.), which were selected for a preventive nutritional intervention for CVD based on the Mediterranean Diet...
April 14, 2017: Environmental Research
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