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https://www.readbyqxmd.com/read/28342994/persistent-organic-pollutants-pops-in-the-atmosphere-of-coastal-areas-of-the-ross-sea-antarctica-indications-for-long-term-downward-trends
#1
Karla Pozo, Tania Martellini, Simonetta Corsolini, Tom Harner, Victor Estellano, Petr Kukučka, Marie D Mulder, Gerhard Lammel, Alessandra Cincinelli
Passive air samplers were used to evaluate long-term trends and spatial distribution of trace organic compounds in Antarctica. Duplicate PUF disk samplers were deployed at six automatic weather stations in the coastal area of the Ross sea (East Antarctica), between December 2010 and January 2011, during the XXVI Italian Scientific Research Expedition. Among the investigated persistent organic compounds, Hexachlorobenzene was the most abundant, with air concentrations ranging from 0.8 to 50 pg m(-3). In general, the following decreasing concentration order was found for the air samples analyzed: HCB > PeCB > PCBs > DDTs > HCHs...
February 27, 2017: Chemosphere
https://www.readbyqxmd.com/read/28342352/mechanochemical-mechanism-of-rapid-dechlorination-of-hexachlorobenzene
#2
Shanshan Deng, Shaoguo Kang, Nannan Feng, Jianxin Zhu, Bo Yu, Xiaofeng Xie, Jing Chen
Recent researches indicate that mechanochemical treatment (MCT) is a promising method to degrade the environmental hazards, especially in the area of persistent organic pollutants (POPs) disposal. However, the mechanochemical dechlorination mechanism of POPs still needs to be further verified. In this mechanochemical process, hexachlorobenzene (HCB) was chosen as a model pollutant with aluminum and alumina (Al+Al2O3) powders as the co-milling regents. Both of the intermediate analysis and quantum chemical calculations were adopted to elucidate the free radical dechlorination mechanism of HCB...
March 12, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28336095/chlorinated-pesticides-and-natural-brominated-anisoles-in-air-at-three-northern-baltic-stations
#3
Terry F Bidleman, Hjalmar Laudon, Olle Nygren, Staffan Svanberg, Mats Tysklind
Polyurethane foam (PUF) disk passive samplers were deployed at one inland and two island locations in the Bothnian Bay region of the northern Baltic Sea. Uptake was linear over 81-147 d and a temperature range of -2.6 to 14.2 °C for organochlorine pesticides (OCPs) and current-use pesticides (CUPs) having log KOA ≥9 at ambient temperatures. Partial saturation of the PUF disks occurred for the more volatile OCPs hexachlorocyclohexanes (HCHs) and hexachlorobenzene (HCB), and for bromoanisoles (BAs), which are products of bromophenols released by natural and anthropogenic sources...
March 20, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28332723/evidence-for-persistent-organochlorine-pollutants-in-the-human-adrenal-cortex
#4
Enza Fommei, Roberta Turci, Andrea Ripoli, Silvana Balzan, Fabrizio Bianchi, Luca Morelli, Alessio Coi
Environmental pollutants may act as endocrine disruptors in animals. Organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) enter the food chain and may accumulate in the fatty animal tissues, including adrenals. To our knowledge, no previous study has investigated their presence in the human normal adrenal (NA) cortex and aldosterone-producing adenomas (APA). Surgical fragments of APA from 11 patients and NA from 8 kidney donors were analyzed for 16 PCBs congeners and 10 OCPs. A Matrix Solid-Phase Dispersion (MSPD) method for simultaneous determination of the target compounds in cortex homogenates was developed...
March 23, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28329713/pcbs-and-ocps-in-human-milk-in-eastern-siberia-russia-levels-temporal-trends-and-infant-exposure-assessment
#5
Elena A Mamontova, Eugenia N Tarasova, Alexander A Mamontov
The aim of our study is to investigate the spatial distribution of polychlorinated biphenyls (PCBs), hexachlorobenzene (HCB), dichlorodiphenyltrichloroethane (p,p'-DDT) and its metabolites, α- and γ-isomers of hexachlorocyclohexane (HCH) in 155 samples of human milk (HM) from Eastern Siberia (six towns and seven villages in Irkutsk Region, one village of the Republic of Buryatia and one town in Zabaikal'sk Region, Russia), and to examine the dietary and social factors influencing the human exposure to the organochlorines...
March 19, 2017: Chemosphere
https://www.readbyqxmd.com/read/28316049/structure-and-function-of-the-bacterial-communities-during-rhizoremediation-of-hexachlorobenzene-in-constructed-wetlands
#6
Cuiping Zhang, Bei Wang, Xiaoyan Dai, Shuying Li, Guangqiu Lu, Yuanqing Zhou
Vertical flow constructed wetlands (VF CWs) are considered to be effective for treating organic pollutants. The rhizosphere of macrophytes such as Phragmites sp., Typha sp. serves as an active and dynamic zone for the microbial degradation of organic pollutants. However, it is still not clear how soil bacterial communities respond to macrophytes and pollutants during the process. For this purpose, the seedlings of Phragmites australis and Typha angustifolia were planted respectively in the VF CWs added with HCB at a dose of 2 mg/kg...
March 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28296078/botulinum-neurotoxin-type-b-uses-a-distinct-entry-pathway-mediated-by-cdc42-into-intestinal-cells-versus-neuronal-cells
#7
Chloé Connan, Marie Voillequin, Carolina Varela Chavez, Christelle Mazuet, Christian Leveque, Sandrine Vitry, Alain Vandewalle, Michel R Popoff
Botulinum neurotoxins (BoNTs) are responsible for severe flaccid paralysis by inhibiting the release of acetylcholine at the neuromuscular junctions. BoNT/B most often induces mild forms of botulism with predominant dysautonomic symptoms. In food borne botulism and botulism by intestinal colonization such as infant botulism, which are the most frequent naturally acquired forms of botulism, the digestive tract is the main entry route of BoNTs into the organism. We previously showed that BoNT/B translocates through mouse intestinal barrier by an endocytosis-dependent mechanism and subsequently targets neuronal cells, mainly cholinergic neurons, in the intestinal mucosa and musculosa...
March 11, 2017: Cellular Microbiology
https://www.readbyqxmd.com/read/28288427/the-trophic-transfer-of-persistent-pollutants-hcb-ddts-pcbs-within-polar-marine-food-webs
#8
Simonetta Corsolini, Gianluca Sarà
Biomagnification (increase in contaminant concentrations at successively higher levels of trophic web), is a process that can transversally impair biodiversity and human health. Most research shows that biomagnification should be higher at poles with northern sites having a major tendency to biomagnify Persistent Organic Pollutants (POPs) through their marine food webs. We investigated the biomagnification degree into two marine trophic webs combining carbon and nitrogen stable isotopes and POP analyses. We showed that the Antarctic trophic web was more depleted than the sub-Arctic one and the differences highlighted for the basal part could explain the difference in length between them...
February 23, 2017: Chemosphere
https://www.readbyqxmd.com/read/28285336/in-focus-in-hcb
#9
EDITORIAL
Douglas J Taatjes, Jürgen Roth
No abstract text is available yet for this article.
March 11, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28277312/organochlorinated-pesticides-levels-in-a-representative-sample-of-the-spanish-adult-population-the-bioambient-es-project
#10
Juan José Ramos, Olga Huetos, Sara González, Marta Esteban, Eva Calvo, Beatriz Pérez-Gómez, Argelia Castaño
Organochlorinated pesticides (OCPs) were measured in a representative sample of Spanish adults within the Bioambient.es project, a nationwide human biomonitoring program promoted by Spanish Ministry of Agriculture, Food and Environment. The objective of Bioambient.es is to establish reference levels of environmental pollutants in the general population. Participants were recruited in 2009-2010 during their annual medical examination at work. Serum levels of thirteen OCPs were investigated: Aldrin, endrin, dieldrin, heptachlor, heptachlor-epoxide, dichlorodiphenyldichloroethylenes (DDEs), hexachlorobenzene (HCB), dichlorodiphenyltrichloroethanes (DDTs) and hexachlorocyclohexanes (HCHs) The highest concentrations were observed for DDE, HCB and β-HCH...
October 17, 2016: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/28274762/are-whale-sharks-exposed-to-persistent-organic-pollutants-and-plastic-pollution-in-the-gulf-of-california-mexico-first-ecotoxicological-investigation-using-skin-biopsies
#11
Maria Cristina Fossi, Matteo Baini, Cristina Panti, Matteo Galli, Begoña Jiménez, Juan Muñoz-Arnanz, Letizia Marsili, Maria Grazia Finoia, Dení Ramírez-Macías
The whale shark (Rhincodon typus) is an endangered species that may be exposed to micro- and macro-plastic ingestion as a result of their filter-feeding activity, particularly on the sea surface. In this pilot project we perform the first ecotoxicological investigation on whale sharks sampled in the Gulf of California exploring the potential interaction of this species with plastic debris (macro-, micro-plastics and related sorbed contaminants). Due to the difficulty in obtaining stranded specimens of this endangered species, an indirect approach, by skin biopsies was used for the evaluation of the whale shark ecotoxicological status...
March 5, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28271351/distribution-and-residue-profile-of-organochlorine-pesticides-and-polychlorinated-biphenyls-in-sediment-and-fish-of-lake-manzala-egypt
#12
Ahmed A El-Kady, Terry L Wade, Stephen T Sweet, José L Sericano
Sediment and fish (Oreochromis niloticus) samples collected from Lake Manzala were analyzed to assess the spatial distribution of OCPs and 96 PCBs. Relatively higher concentrations of chlorpyrifos, ∑DDT, and HCB were found, particularly at the Bahr Al-Baqar drain station, which has uncontrolled inputs of untreated domestic, agricultural, and industrial wastes. The concentrations of ∑PCBs ranged from 19 to 69 ng/g dw and from 7.4 to 29 ng/g dw for sediment and fish samples, respectively. Ratios of DDT to its metabolites suggest that the source of ∑DDT is from past usage of technical DDT in the regions surrounding the lake...
March 7, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28248661/hyperbolic-crystallography-of-two-periodic-surfaces-and-associated-structures
#13
Martin Cramer Pedersen, Stephen T Hyde
This paper describes the families of the simplest, two-periodic constant mean curvature surfaces, the genus-two HCB and SQL surfaces, and their isometries. All the discrete groups that contain the translations of the genus-two surfaces embedded in Euclidean three-space modulo the translation lattice are derived and enumerated. Using this information, the subgroup lattice graphs are constructed, which contain all of the group-subgroup relations of the aforementioned quotient groups. The resulting groups represent the two-dimensional representations of subperiodic layer groups with square and hexagonal supergroups, allowing exhaustive enumeration of tilings and associated patterns on these surfaces...
March 1, 2017: Acta Crystallographica. Section A, Foundations and Advances
https://www.readbyqxmd.com/read/28247029/in-focus-in-hcb
#14
EDITORIAL
Douglas J Taatjes, Jürgen Roth
No abstract text is available yet for this article.
March 1, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28238380/organochlorine-pesticide-concentrations-in-pooled-serum-of-people-in-different-age-groups-from-five-chinese-cities
#15
Qinghua Wang, Haodong Yuan, Jun Jin, Peng Li, Yulong Ma, Ying Wang
Organochlorine pesticides (OCPs) were determined in human serum samples pooled by donor age (≥60, 50-59, 40-49, 30-39, and 20-29y). The pooled samples were supplied by hospitals in five Chinese cities, Yitong (Jilin Province), Weifang (Shandong Province), Ganzi (Sichuan Province), Huaihua (Hunan Province), and Lingshui (Hainan Province). p,p'-Dichlorodiphenyldichloroethylene (DDE), hexachlorobenzene (HCB), β-hexachlorocyclohexane (HCH), and endosulfan I were the dominant OCPs in the serum samples. The total OCP concentrations and individual concentrations of p,p'-DDE, HCB, and β-HCH were relatively high compared with concentrations that have been found in other parts of the world...
May 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28219247/addressing-analytical-challenges-of-the-environmental-monitoring-for-the-water-framework-directive-erm-ce100-a-new-biota-certified-reference-material
#16
Ioannis Dosis, Marina Ricci, Laszlo Majoros, Roberto Lava, Håkan Emteborg, Andrea Held, Hendrik Emons
In the context of supporting the EU Member States in the implementation of the EU Water Framework Directive (WFD), a project for the production of a fish reference material (ERM-CE100) certified for its content of the two priority substances hexachlorobenzene (HCB) and hexachlorobutadiene (HCBD) was carried out at the Joint Research Centre (JRC) of the European Commission. The starting material was naturally contaminated Wels catfish (Silurus glanis), caught in the Ebro River (Spain). A novel approach for the processing of the fish was tested that resulted in a homogeneous and stable reference material in the form of a wet paste...
February 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28215542/hexachlorobenzene-alters-cell-cycle-by-regulating-p27-cyclin-e-cdk2-and-c-src-p27-protein-complexes
#17
C Ventura, M Núñez, V Gaido, C Pontillo, N Miret, A Randi, C Cocca
Hexachlorobenzene (HCB) is an organochlorine pollutant widely distributed in the environment around the entire world. Previous reports from our group and others have demonstrated that this compound is as an endocrine disruptor. We have also reported that HCB presents a co-carcinogenic effect in N-Nitroso-N-methyl-urea-induced mammary tumours in rats. In this work, we studied the effects of HCB on cell cycle progression and cell cycle regulating protein expression in the estrogen-sensitive breast cancer cell line, MCF-7...
March 15, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28202064/prediagnostic-plasma-concentrations-of-organochlorines-and-risk-of-b-cell-non-hodgkin-lymphoma-in-envirogenomarkers-a-nested-case-control-study
#18
Rachel S Kelly, Hannu Kiviranta, Ingvar A Bergdahl, Domenico Palli, Ann-Sofie Johansson, Maria Botsivali, Paolo Vineis, Roel Vermeulen, Soterios A Kyrtopoulos, Marc Chadeau-Hyam
BACKGROUND: Evidence suggests a largely environmental component to non-Hodgkin's lymphoma (NHL). Persistent organic pollutants (POPs) including polychlorinated biphenyls (PCBs), DDE and HCB have been repeatedly implicated, but the literature is inconsistent and a causal relationship remains to be determined. METHODS: The EnviroGenoMarkers study is nested within two prospective cohorts EPIC-Italy and the Northern Sweden Health and Disease Study. Six PCB congeners, DDE and HCB were measured in blood plasma samples provided at recruitment using gas-chromatography mass spectrometry...
February 16, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/28192994/cats-internal-exposure-to-selected-brominated-flame-retardants-and-organochlorines-correlated-to-house-dust-and-cat-food
#19
J Norrgran Engdahl, A Bignert, B Jones, I Athanassiadis, Å Bergman, J M Weiss
Pet cats may be used as a biomarker for assessing exposures to organohalogen compounds (OHCs) adsorbed to household dust in home environments. This study explores two exposure routes of OHCs, ingestion of OHCs (i) via house dust and (ii) via cat food. House dust from 17 Swedish homes and serum from the participating families' pet cats were collected, and cat food was purchased matching the diet reported. Paired samples of cat serum, house dust, and cat food were analyzed for brominated flame retardants/natural products (polybrominated diphenyl ethers (PBDEs), decabromobiphenyl (BB-209), decabromodiphenyl ethane (DBDPE), 2,4,6-tribromophenol (2,4,6-TBP), OH-PBDEs) and organochlorines (polychlorinated biphenyls (PCBs), 1,1-bis(4,4'-dichlorodiphenyl)-2,2,2-trichloroethane (4,4'-DDT), 1,1-bis(4,4'-dichlorodiphenyl)-2,2-dichloroethene (4,4'-DDE), hexachlorobenzene (HCB), pentachlorophenol (PCP))...
March 7, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28160993/three-cycles-of-human-biomonitoring-in-flanders-time-trends-observed-in-the-flemish-environment-and-health-study
#20
Greet Schoeters, Eva Govarts, Liesbeth Bruckers, Elly Den Hond, Vera Nelen, Stefaan De Henauw, Isabelle Sioen, Tim S Nawrot, Michelle Plusquin, Annette Vriens, Adrian Covaci, Ilse Loots, Bert Morrens, Dries Coertjens, Nicolas Van Larebeke, Sam De Craemer, Kim Croes, Nathalie Lambrechts, Ann Colles, Willy Baeyens
To follow time trends in exposure to environmental chemicals, three successive campaigns of the Flemish Environment and Health Study (FLEHS) have recruited and sampled in total 5825 participants between 2002 and 2014. Cord samples from newborns, urine and blood samples from 14 to 15 years old adolescents and from adults between 50 and 65 years old were analysed in geographical representative samples of the Flemish population. The data of the different campaigns were considered per age group and per biomarker after adjustment for predefined covariates to take into account differences in characteristics of the study populations over time...
November 18, 2016: International Journal of Hygiene and Environmental Health
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