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https://www.readbyqxmd.com/read/29140398/legacy-organochlorine-pollutants-in-glacial-watersheds-a-review
#1
K R Miner, J Blais, C Bogdal, S Villa, M Schwikowski, P Pavlova, C Steinlin, C Gerbi, K J Kreutz
Northern Hemisphere alpine glaciers have been identified as a point of concentration and reemergence of legacy organochlorine pollutants (OCPs). In this review, we compile a selection of published literature combining long-range, global atmospheric transport and distribution-based compartmental environmental flux models, as well as data from glacial meltwater, ice core, crevasse and proglacial lake sediment studies. Regional studies of ice and meltwater in alpine glaciers of the northern latitudes show similarities in sample deposition profiles and concentration due to chemical atmospheric residence time, precipitation type and glacier flow rates...
November 15, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/29138423/the-photocycle-of-orange-carotenoid-protein-conceals-distinct-intermediates-and-asynchronous-changes-in-the-carotenoid-and-protein-components
#2
E G Maksimov, N N Sluchanko, Y B Slonimskiy, E A Slutskaya, A V Stepanov, A M Argentova-Stevens, E A Shirshin, G V Tsoraev, K E Klementiev, O V Slatinskaya, E P Lukashev, T Friedrich, V Z Paschenko, A B Rubin
The 35-kDa Orange Carotenoid Protein (OCP) is responsible for photoprotection in cyanobacteria. It acts as a light intensity sensor and efficient quencher of phycobilisome excitation. Photoactivation triggers large-scale conformational rearrangements to convert OCP from the orange OCP(O) state to the red active signaling state, OCP(R), as demonstrated by various structural methods. Such rearrangements imply a complete, yet reversible separation of structural domains and translocation of the carotenoid. Recently, dynamic crystallography of OCP(O) suggested the existence of photocycle intermediates with small-scale rearrangements that may trigger further transitions...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29137944/reproductive-factors-nutritional-status-and-serum-25-oh-d-levels-in-women-with-breast-cancer-a-case-control-study
#3
REVIEW
Nighat Y Sofi, Monika Jain, Umesh Kapil, Vuthaluru Seenu, Lakshmy R, Chander P Yadav, Ravindra M Pandey, Neha Sareen
The study was conducted with an objective to investigate the association between reproductive factors, nutritional status and serum 25(OH)D levels among women diagnosed with breast cancer (BC). A total of 200 women with BC attending a tertiary healthcare institute of Delhi, India matched with 200 healthy women for age (±2years) and socio economic status were included in the study. Data was collected on socio-demographic profile, reproductive factors, physical activity and dietary intake (24hour dietary recall and food frequency questionnaire) using interviewer administered structured questionnaires and standard tools...
November 11, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29136593/polycyclic-aromatic-hydrocarbons-and-organochlorine-pesticides-in-surface-water-from-the-yongding-river-basin-china-seasonal-distribution-source-apportionment-and-potential-risk-assessment
#4
Yizhen Wang, Shilu Zhang, Wenyan Cui, Xianzhi Meng, Xianqiang Tang
The presence of 17 polycyclic aromatic hydrocarbons (PAHs) and 15 persistent organochlorine pesticides (OCPs) in surface water of the Yongding River Basin was analyzed through GC/MS/MS during the spring and summer at 46 sampling sites. The goal was to investigate their seasonal distribution, possible sources, and potential risk. Our results showed that the total PAH concentration in surface water of Yongding River Basin ranged from 41.60 to 1482.60ng/L with a mean value of 137.85ng/L in the spring, and from 53...
November 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29136567/persistent-organic-pollutants-in-red-and-white-blooded-high-antarctic-notothenioid-fish-from-the-remote-weddell-sea
#5
Anneli Strobel, Peter Schmid, Patricia Burkhardt-Holm, Helmut Segner, Markus Zennegg
It has been suggested that High-Antarctic waters, despite their remoteness from human activities, are impacted by anthropogenic pollution, and that the local biota are accumulating the contaminants. At present, no data exist on persistent organic pollutant (POP) body burdens for notothenioid fish inhabiting the High-Antarctic Weddell Sea. We determined the pollutant load in white muscle tissue of red- and white-blooded notothenoids from the Weddell Sea (Trematomus loennbergii and Chionodraco hamatus, respectively), and compared them to our previous measurements of POPs in Low-Antarctic notothenioids...
November 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/29132011/effect-of-anode-polarization-on-biofilm-formation-and-electron-transfer-in-shewanella-oneidensis-graphite-felt-microbial-fuel-cells
#6
David Pinto, Thibaud Coradin, Christel Laberty-Robert
In microbial fuel cells, electricity generation is assumed by bacterial degradation of low-grade organics generating electrons that are transferred to an electrode. The nature and efficiency of the electron transfer from the bacteria to the electrodes are determined by several chemical, physical and biological parameters. Specifically, the application of a specific potential at the bioanode has been shown to stimulate the formation of an electro-active biofilm, but the underlying mechanisms remain poorly understood...
October 31, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/29131997/organochlorine-pesticides-across-the-tributaries-of-river-ravi-pakistan-human-health-risk-assessment-through-dermal-exposure-ecological-risks-source-fingerprints-and-spatio-temporal-distribution
#7
Mujtaba Baqar, Yumna Sadef, Sajid Rashid Ahmad, Adeel Mahmood, Jun Li, Gan Zhang
This study monitored the human health risks through dermal exposure, hazardous risks to ecological integrity, contamination levels, spatio-temporal distribution, and congener specific analysis of organochlorine pesticides (OCPs) across River Ravi and its three northern tributaries (Nullah Bein, Nullah Basanter and Nullah Deg). The residual levels of OCPs isomers were screened for water (n=54) and surface sediment (n=54) samples from twenty seven sampling sites in two alternate seasons (pre-monsoon and post-monsoon)...
November 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29126639/sedimentary-black-carbon-and-organochlorines-in-lesser-himalayan-region-of-pakistan-relationship-along-the-altitude
#8
Usman Ali, Andrew James Sweetman, Rahat Riaz, Jun Li, Gan Zhang, Kevin C Jones, Riffat Naseem Malik
Black carbon (BC) and total organic carbon (TOC) along with their relationship with organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) were assessed in Lesser Himalayan Region (LHR) in different altitudinal zones based on anthropogenic influence/source proximity under the scope of this study. Results revealed the concentrations of BC, TOC, OCPs and PCBs varied between 0.3 and 43.5mgg(-1), 1.7-65.4mgg(-1), 0.59-3.64ngg(-1) and 0.01-1.31ngg(-1), respectively. Spatial distribution trends have shown higher levels of OCPs and PCBs contamination near populated and urban areas along the altitude...
November 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29126029/analysis-of-organochlorine-pesticides-in-surface-water-of-the-songhua-river-using-magnetoliposomes-as-adsorbents-coupled-with-gc-ms-ms-detection
#9
Hui Wang, Bo Qu, He Liu, Jie Ding, Nanqi Ren
A simple and effective method based on magnetic separation has been developed for the extraction of organochlorine pesticides (OCPs) from river water samples using magnetoliposomes as adsorbents. This method avoided the time-consuming column passing process of loading large volume samples in traditional SPE through the rapid isolation of magnetoliposomes with an adscititious magnet. Lipid bilayers formed on the surface of Fe3O4 showed great adsorptive tendency towards analytes through hydrophobic interactions, and zwitterions headgroups endowed the outer surface of magnetoliposomes with hydrophilicity to improve the dispersing property of adsorbents in the sample matrix...
November 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29125583/occurrences-of-organochlorine-pesticides-along-the-course-of-the-buffalo-river-in-the-eastern-cape-of-south-africa-and-its-health-implications
#10
Abdulrazaq Yahaya, Omobola O Okoh, Anthony I Okoh, Abiodun O Adeniji
Most organochlorine pesticides (OCPs) which are increasingly used in agriculture and industry are not biodegradable and thereby persist in the environment for a very long period of time. They are capable of negatively impacting the health of humans and biota when present in a higher concentration than recommended. This study evaluated the concentrations of 17 OCPs in surface water samples collected from six sampling sites along the course of the Buffalo River in Eastern Cape, South Africa, between December 2015 and May 2016...
November 10, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29123598/ready-or-not-pharmacist-perceptions-of-a-changing-injection-scope-of-practice-before-it-happens
#11
Esther Ai-Leng Foong, David J Edwards, Sherilyn Houle, Kelly A Grindrod
Background: Since 2012, Ontario pharmacists have been authorized to administer the influenza vaccine. In April 2016, the Ontario College of Pharmacists (OCP) proposed to expand the Pharmacy Act to allow pharmacists to vaccinate against 13 additional conditions. The OCP held an online public consultation and invited pharmacists, members of the public and organizations to weigh in on the proposed changes. Our objective was to explore the factors influencing how Ontario pharmacists may adopt or reject an expanding scope of practice, using data from the public consultation...
November 2017: Canadian Pharmacists Journal: CPJ, Revue des Pharmaciens du Canada: RPC
https://www.readbyqxmd.com/read/29122355/current-status-of-organochlorine-pesticides-ocps-and-polychlorinated-biphenyls-pcbs-exposure-among-mothers-and-their-babies-of-korea-check-cohort-study
#12
Sooran Choi, Hai-Joong Kim, Sunmi Kim, Gyuyeon Choi, Sungjoo Kim, Jeongim Park, Soon-Sup Shim, Inae Lee, Sungkyoon Kim, Hyo-Bang Moon, Kyungho Choi, Jeong Jae Lee, Su Young Kim
Despite the global ban, organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) have been a persistent and significant environmental health issue worldwide. Prenatal exposure to these persistent organic pollutants (POPs) has been identified as a major route of exposure among developing fetuses and newborn infants. Among Children's Health and Environmental Health of Korea (CHECK) cohort population, pregnant females (n=148) and their matching newborn infants (n=117) recruited from four cities of Korea in 2011 were investigated...
November 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29119286/no-effect-of-topical-application-of-tranexamic-acid-on-articular-cartilage
#13
Luiz Felipe Ambra, Laura de Girolamo, Wanting Niu, Amy Phan, Myron Spector, Andreas H Gomoll
PURPOSE: The objective of this study was to evaluate potential cytotoxicity of TXA on articular cartilage by assessing chondrocyte viability of osteochondral explants after exposure to different concentrations and durations of TXA. METHODS: Thirty-nine osteochondral plugs (OCPs) were harvested from three adult Yucatan minipigs immediately after their death. OCPs were divided into 13 groups exposed to different concentrations of TXA (1, 2 and 4 mg/ml in saline solution) for 1, 3 and 6 h...
November 8, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29100182/transplacental-transfer-characteristics-of-organochlorine-pesticides-in-paired-maternal-and-cord-sera-and-placentas-and-possible-influencing-factors
#14
Xiaolan Zhang, Xia Wu, Bingli Lei, Ye Jing, Zi'an Jiang, Xinyu Zhang, Xiangming Fang, Yingxin Yu
Organochlorine pesticides (OCPs), including dichlorodiphenyltrichloroethane (DDT) and its metabolites [dichlorodiphenyldichloroethylene (DDE) and dichlorodiphenyldichloroethane], hexachlorocyclohexanes (HCHs), and hexachlorobenzene (HCB), are widely detected in humans despite the considerable decline in environmental concentrations. To understand the placental transfer of OCPs and the possible maternal influence on them, we measured the concentrations of DDTs, HCHs, and HCB in 102 paired samples of maternal and cord sera, and placentas collected in Shanghai, China...
October 31, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29095454/synthesis-of-p2c2o2-and-p2co-via-nhc-mediated-coupling-of-the-phosphaethynolate-anion
#15
Robert J Gilliard, Riccardo Suter, Erik Schrader, Zoltán Benkő, Arnold L Rheingold, Hansjörg Grützmacher, John D Protasiewicz
The reaction of the chloroimidazolium chloride salt, [NHC-Cl][Cl], NHC = C{N(2,6-(i)Pr2C6H3)CH}2 (1) with two equivalents of sodium phosphaethynolate, Na[OCP]·(dioxane)2.5, results in the formation of NHC-{cyclo-(CO)-P2-C(O)} (2) and NHC-P2-C(O)-NHC (3). Notably, in the presence of free NHC ligand, compound 2 converts to compound 3via extrusion of CO at elevated temperatures. The nature of the bonding in these complexes was probed computationally and spectroscopically.
November 2, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29090427/on-the-origin-of-the-slow-m-t-chlorophyll-a-fluorescence-decline-in-cyanobacteria-interplay-of-short-term-light-responses
#16
Gábor Bernát, Gábor Steinbach, Radek Kaňa, Govindjee, Amarendra N Misra, Ondřej Prašil
The slow kinetic phases of the chlorophyll a fluorescence transient (induction) are valuable tools in studying dynamic regulation of light harvesting, light energy distribution between photosystems, and heat dissipation in photosynthetic organisms. However, the origin of these phases are not yet fully understood. This is especially true in the case of prokaryotic oxygenic photoautotrophs, the cyanobacteria. To understand the origin of the slowest (tens of minutes) kinetic phase, the M-T fluorescence decline, in the context of light acclimation of these globally important microorganisms, we have compared spectrally resolved fluorescence induction data from the wild type Synechocystis sp...
October 31, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/29080540/higher-atmospheric-levels-and-contribution-of-black-carbon-in-soil-air-partitioning-of-organochlorines-in-lesser-himalaya
#17
Usman Ali, Andrew James Sweetman, Kevin C Jones, Riffat Naseem Malik
Due to influence of wind patterns (monsoon and westerlies) and anthropogenic activities, lower stretch of Himalaya is at direct exposure to persistent organic pollutants (POPs). Current study was designed to monitor atmospheric concentrations of long lived organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) using polyurethane passive air sampling in the Lesser Himalayan Region (LHR) of Pakistan. Levels of ∑HCHs, ∑DDTs and ∑PCBs were observed in a range between 3 and 210 pg m(-3), 0...
October 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/29079083/pesticide-use-in-the-wheat-maize-double-cropping-systems-of-the-north-china-plain-assessment-field-study-and-implications
#18
Bentje Brauns, Rasmus Jakobsen, Xianfang Song, Poul L Bjerg
In the North China Plain (NCP), rising inputs of pesticides have intensified the environmental impact of farming activities in recent decades by contributing to surface water and groundwater contamination. In response to this, the Chinese government imposed stricter regulations on pesticide approval and application, and better monitoring strategies are being developed. However, sufficient and well-directed research on the accumulation and impact of different pesticides is needed for informed decision-making...
October 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29078782/gestational-exposure-to-endocrine-disrupting-chemicals-in-relation-to-infant-birth-weight-a-bayesian-analysis-of-the-home-study
#19
Meghan M Woods, Bruce P Lanphear, Joseph M Braun, Lawrence C McCandless
BACKGROUND: Pregnant women are exposed to a mixture of endocrine disrupting chemicals (EDCs). Gestational EDC exposures may be associated with changes in fetal growth that elevates the risk for poor health later in life, but few studies have examined the health effects of simultaneous exposure to multiple chemicals. This study aimed to examine the association of gestational exposure to five chemical classes of potential EDCs: phthalates and bisphenol A, perfluoroalkyl substances (PFAS), polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), and organochlorine pesticides (OCPs) with infant birth weight...
October 27, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/29077176/long-term-remission-of-ocular-cicatricial-pemphigoid-off-immunomodulatory-therapy
#20
Caiyun You, Lina Ma, Stephen D Anesi, C Stephen Foster
PURPOSE: To evaluate whether long-term remission of ocular cicatricial pemphigoid (OCP) after withdrawal of immunomodulatory therapy (IMT) is possible. METHODS: A total of 34 of 464 presenting patients (66 eyes) with biopsy-proven OCP in long-term remission off IMT were identified after finishing a 2-year IMT regimen without active disease (2005-2015). Long-term remission off IMT for OCP was defined as patients withdrawn from IMT ≥1 year lacking clinically detectable progressive scarring according to Foster staging and subjective assessment...
October 14, 2017: European Journal of Ophthalmology
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