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https://www.readbyqxmd.com/read/28732330/legacy-persistent-organic-pollutants-including-pbdes-in-the-trophic-web-of-the-ross-sea-antarctica
#1
Simonetta Corsolini, Nicoletta Ademollo, Tania Martellini, Demetrio Randazzo, Marino Vacchi, Alessandra Cincinelli
The ecological features of the Ross Sea trophic web are peculiar and different from other polar food webs, with respect to the use of habitat and species interactions; due to its ecosystem integrity, it is the world's largest Marine Protected Area, established in 2016. Polar organisms are reported to bioaccumulate lipophilic contaminant, viz persistent organic pollutants (POPs). Legacy POPs and flame retardants (polybrominated diphenyl ethers, PBDEs) were studied in key species of the Ross Sea (Euphausia superba, Pleuragramma antarctica) and their predators (Dissostichus mawsoni, Pygoscelis adeliae, Aptenodytes forsteri, Catharacta maccormicki, Leptonychotes weddellii)...
July 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28721451/in-focus-in-hcb
#2
EDITORIAL
Douglas J Taatjes, Jürgen Roth
No abstract text is available yet for this article.
July 19, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28697468/emission-factors-of-unintentional-hcb-and-pecbz-and-their-correlation-with-pcdd-pcdf
#3
Wenwen Gong, Heidelore Fiedler, Xiaotu Liu, Bin Wang, Gang Yu
Hexachlorobenzene (HCB) and pentachlorobenzene (PeCBz) have been listed as unintentional POPs in the annex of the Stockholm Convention and thus, attracted attention by government and researchers. Since the intentional production and use has ceased in most countries, the unintentional releases to the environment have increased. This study gathered 206 and 78 emission factors (EFs) of unintentional HCB and PeCBz from scientific publications and governmental reports, respectively. Most of the EFs referred to the release vector "air" (EFAir) and to a less extent to "product" (EFProduct)...
July 8, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28689110/persistent-organic-pollutants-in-infants-and-toddlers-relationship-between-concentrations-in-matched-plasma-and-faecal-samples
#4
Yiqin Chen, Andreas Sjodin, Michael S McLachlan, Karin English, Lesa L Aylward, Leisa-Maree L Toms, Julie Varghese, Peter D Sly, Jochen F Mueller
Early-childhood biomonitoring of persistent organic pollutants (POPs) is challenging due to the logistic and ethical limitations associated with blood sampling. We investigated using faeces as a non-invasive matrix to estimate internal exposure to POPs. The concentrations of selected POPs were measured in matched plasma and faecal samples collected from 20 infants/toddlers (aged 13±4.8months), including a repeat sample time point for 13 infants (~5months apart). We observed higher rates of POP quantification in faeces (2g dry weight) than in plasma (0...
July 6, 2017: Environment International
https://www.readbyqxmd.com/read/28682607/mechanism-and-rate-of-thermal-decomposition-of-hexachlorocyclopentadiene-and-its-importance-in-pcdd-f-formation-from-the-combustion-of-cyclodiene-pesticides
#5
Nirmala Kumuduni Dharmarathne, John C Mackie, Eric M Kennedy, Michael Stockenhuber
Thermal decomposition of hexachlorocyclopentadiene (HCCP) has been studied in inert gas and under oxidative conditions in a silica flow reactor at a residence time of 5.0 s between 690 - 923 K and 1 atm pressure. Pyrolysis was initiated by Cl bond fission to form pentachlorocyclopentadienyl radical; two such radicals then combine to undergo a series of intramolecular rearrangements and Cl fissions producing principally octachloronaphthalene (8ClNP) and Cl2. This process has been studied by quantum chemical calculation and a reaction potential energy surface developed...
July 6, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28648904/mixture-effects-of-30-environmental-contaminants-on-incident-metabolic-syndrome-a-prospective-study
#6
Lars Lind, Samira Salihovic, Erik Lampa, P Monica Lind
BACKGROUND: Several cross-sectional studies have linked different environmental contaminants to the metabolic syndrome (MetS). However, mixture effects have not been investigated and no prospective studies exist regarding environmental contaminants and the MetS. OBJECTIVES: To study mixture effects of contaminants on the risk of incident MetS in a prospective fashion. METHODS: Our sample consisted of 452 subjects from the Prospective Study of the Vasculature in Uppsala Seniors (PIVUS) study (50% women, all aged 70years) free from the MetS at baseline, being followed for 10years...
June 22, 2017: Environment International
https://www.readbyqxmd.com/read/28643083/in-focus-in-hcb
#7
EDITORIAL
Douglas J Taatjes, Jürgen Roth
No abstract text is available yet for this article.
August 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28634113/vitamin-d3-supplementation-attenuates-the-early-stage-of-mouse-hepatocarcinogenesis-promoted-by-hexachlorobenzene-fungicide
#8
Guilherme R Romualdo, Renata L Goto, Ana A H Fernandes, Bruno Cogliati, Luis F Barbisan
Hexachlorobezene (HCB), a fungicide widely distributed in the environment, promotes the development of hepatocellular preneoplastic lesions (PNL) and tumors in rodents. In contrast, vitamin D3 (VD3) supplementation presents a potential role for the prevention/treatment of chronic liver diseases. Thus, we investigated whether VD3 supplementation attenuates the early stage of HCB-promoted hepatocarcinogenesis. Female Balb/C mice were injected a single dose of diethylnitrosamine (DEN, 50 mg/kg) at postnatal day 15...
June 17, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28616737/serum-concentrations-of-selected-organochlorine-pesticides-in-a-lebanese-population-and-their-associations-to-sociodemographic-anthropometric-and-dietary-factors-enasb-study
#9
Mireille Harmouche-Karaki, Joseph Matta, Khalil Helou, Yara Mahfouz, Nicole Fakhoury-Sayegh, Jean-François Narbonne
Organochlorine pesticides (OCPs) were banned by the Stockholm Convention many years ago; however, they are still detected in the environment due to their high persistence, their current illegal use, and their import from countries where they have not been banned. We evaluated the serum concentrations of selected OCPs (hexachlorobenzene (HCB), β-hexachlorocyclohexanes (β-HCH), p,p'-dichlorodiphenyltrichloroethane (DDT) and its metabolite p,p'-dichlorodiphenyldichloroethylene (DDE) in a sample of Lebanese adults using gas chromatography coupled to an ion trap mass spectrometer detector...
June 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28610570/exploring-infant-feeding-practices-cross-sectional-surveys-of-south-western-sydney-singapore-and-ho-chi-minh-city
#10
Timothy Yong Qun Leow, Andrew Ung, Shelley Qian, Jessie Thanh Nguyen, Yvonne An, Poonam Mudgil, John Whitehall
BACKGROUND: Infant feeding practices are known to influence the child's long-term health. Studies have associated obesity and other diseases with reduced breastfeeding and early introduction of high calorie beverages (HCBs). The rising prevalence of obesity is already a problem in most developed countries, especially Australia, but cultural differences are influential. Our aim is to examine and compare infant feeding practices and educational levels of respondents through questionnaires in three culturally different sites: Campbelltown (South Western Sydney), Australia, Singapore and Ho Chi Minh City, Vietnam (HCMC)...
June 13, 2017: BMC Pediatrics
https://www.readbyqxmd.com/read/28604907/solvent-dependent-selective-cation-exchange-in-anionic-frameworks-based-on-cobalt-ii-and-triphenylamine-linkers-reactor-dependent-synthesis-and-sorption-properties
#11
Oluseun Akintola, David Hornig, Axel Buchholz, Helmar Görls, Winfried Plass
Two cobalt(ii) coordination polymers with anionic networks of formulae {(Me2NH2)2[CoCl(ntb)]}n (JUMP-2) and {(Me2NH2)2[Co5(ntb)4(H2O)3(Me2NH)]}n (previously reported as MIL-144 by Livage et al., Microporous Mesoporous Mater., 2012, 157, 37) have been obtained via a solvothermal reaction of cobalt chloride and 4,4',4''-nitrilotribenzoic acid (H3ntb) in DMF employing two differently-sized reactors, while using the same absolute amount of reactants. Structure analysis revealed that JUMP-2 crystallized in the monoclinic space group P21/n and displays a two-dimensional (2D) network, which by topological analysis was characterized as a layered 3-connected hcb net...
June 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28589288/in-focus-in-hcb
#12
EDITORIAL
Douglas J Taatjes, Jürgen Roth
No abstract text is available yet for this article.
June 6, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28585283/enhanced-crude-oil-biodegradative-potential-of-natural-phytoplankton-associated-hydrocarbonoclastic-bacteria
#13
Haydn Thompson, Angelina Angelova, Bernard Bowler, Martin Jones, Tony Gutierrez
Phytoplankton have been shown to harbour a diversity of hydrocarbonoclastic bacteria (HCB), yet it is not understood how these phytoplankton-associated HCB would respond in the event of an oil spill at sea. Here, we assess the diversity and dynamics of the bacterial community associated with a natural population of marine phytoplankton under oil spill-simulated conditions, and compare it to that of the free-living (non phytoplankton-associated) bacterial community. While the crude oil severely impacted the phytoplankton population and was likely conducive to marine oil snow formation, analysis of the MiSeq-derived 16S rRNA data revealed dramatic and differential shifts in the oil-amended communities that included blooms of recognized HCB (e...
June 5, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28570991/from-antarctica-to-the-subtropics-contrasted-geographical-concentrations-of-selenium-mercury-and-persistent-organic-pollutants-in-skua-chicks-catharacta-spp
#14
Alice Carravieri, Yves Cherel, Maud Brault-Favrou, Carine Churlaud, Laurent Peluhet, Pierre Labadie, Hélène Budzinski, Olivier Chastel, Paco Bustamante
Seabirds integrate bioaccumulative contaminants via food intake and have revealed geographical trends of contamination in a variety of ecosystems. Pre-fledging seabird chicks are particularly interesting as bioindicators of chemical contamination, because concentrations in their tissues reflect primarily dietary sources from the local environment. Here we measured 14 trace elements and 18 persistent organic pollutants (POPs) in blood of chicks of skuas that breed in four sites encompassing a large latitudinal range within the southern Indian Ocean, from Antarctica (Adélie Land, south polar skua Catharacta maccormicki), through subantarctic areas (Crozet and Kerguelen Islands, brown skua C...
May 29, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28567035/evaluating-the-detection-of-hydrocarbon-degrading-bacteria-in-16s-rrna-gene-sequencing-surveys
#15
David Berry, Tony Gutierrez
Hydrocarbonoclastic bacteria (HCB) play a key role in the biodegradation of oil hydrocarbons in marine and other environments. A small number of taxa have been identified as obligate HCB, notably the Gammaproteobacterial genera Alcanivorax, Cycloclasticus, Marinobacter, Neptumonas, Oleiphilus, Oleispira, and Thalassolituus, as well as the Alphaproteobacterial genus Thalassospira. Detection of HCB in amplicon-based sequencing surveys relies on high coverage by PCR primers and accurate taxonomic classification...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28546950/genetic-polymorphisms-of-multidrug-and-toxin-extrusion-proteins-mate1-and-mate2-in-south-indian-population
#16
Gerard Marshall Raj, Jayanthi Mathaiyan, Mukta Wyawahare, Katiboina Srinivasa Rao, Rekha Priyadarshini
Introduction: Drug transporters are key determinants of pharmacokinetic and pharmacodynamic profiles of certain drugs. SLC47A1 (MATE1) and SLC47A2 (MATE2) are major efflux transporters involved in the hepatic and renal excretion of many cationic drugs including metformin. Our study was proposed to determine the normative frequencies of the single nucleotide polymorphisms (SNPs) rs2289669 and rs12943590 in the SLC47A1 and SLC47A2 genes, respectively, in South Indian population and also to compare those with those of the HapMap populations...
2017: BioImpacts: BI
https://www.readbyqxmd.com/read/28540444/organochlorine-pesticides-residues-in-human-breast-milk-from-the-middle-governorates-in-jordan-in-2013-2014
#17
Tawfiq M Al Antary, Mahmoud A Alawi, Hussein Estityah, Nizar Haddad
One hundred samples of mother breast milk were gathered from six middle governorates and districts in Jordan in 2013/2014 to monitor Organochlorine pesticides pollutants. The results showed clearly that banned organochlorine pesticides are still detected in the monitored samples in low concentration despite banning of these persistent pollutants in Jordan since 36 years ago. However, the results indicated that 1% of the contaminated samples contained β-HCH, 5% γ-HCH, 3% p,p'-DDD, 2% heptachlor, 45% p,p'-DDE and 3% p,p'-DDT...
July 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28525872/levels-and-temporal-trends-of-organochlorine-contaminants-in-mussels-from-spanish-mediterranean-waters
#18
Juan A Campillo, Beatriz Fernández, Víctor García, José Benedicto, Víctor M León
The levels and trends of organochlorine contaminants were determined along the Spanish Mediterranean coast from 2000 to 2013 using mussel, Mytilus galloprovincialis, as bioindicator species. The highest levels of PCBs and DDTs were found at industrial and urban locations, and at areas under the influence of the mouth of major rivers. Dieldrin and t-NNC were commonly detected, while HCHs, aldrin, isodrin, endrin and HCB were at levels not detectable at many areas. Significant declines on the levels of DDTs were observed at most of the areas studied...
May 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28463822/organochlorine-pesticides-and-polychlorinated-biphenyls-in-human-adipose-tissue-from-northern-tunisia-current-extent-of-contamination-and-contributions-of-socio-demographic-characteristics-and-dietary-habits
#19
Amani Achour, Abdelkader Derouiche, Badreddine Barhoumi, Badreddine Kort, Driss Cherif, Sondes Bouabdallah, Mohsen Sakly, Khémais Ben Rhouma, Soufiane Touil, Mohamed Ridha Driss, Olfa Tebourbi
The aims of the present study were to investigate the current exposure levels of persistent organochlorine compounds (OCs) in adipose tissues intraoperatively collected from 40 patients over 20 years undergoing non-cancer-related surgery residing in Northern region of Tunisia (Bizerte), which constitutes an exemplary case, and examined association between levels of contamination and both socio-demographic characteristics and dietary habits. Concentration of hexachlorobenzene (HCB), hexachlorocyclohexane isomers (α-HCH, β-HCH, γ-HCH and δ-HCH), dichlorodiphenyltrichloroethane isomers (p,p'-DDT and o,p'-DDT) and metabolites (p,p'-DDE, o,p'-DDE, p,p'-DDD and o,p'-DDD) and 12 polychlorinated biphenyls (PCBs) congeners were measured using capillary gas chromatography with electron capture detector...
July 2017: Environmental Research
https://www.readbyqxmd.com/read/28456845/in-focus-in-hcb
#20
EDITORIAL
Douglas J Taatjes, Jürgen Roth
No abstract text is available yet for this article.
April 29, 2017: Histochemistry and Cell Biology
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