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https://www.readbyqxmd.com/read/29783084/organochlorine-pesticides-ocps-and-polychlorinated-biphenyls-pcbs-in-cyprinidae-fish-towards-hints-of-their-arrangements-using-advanced-classification-methods
#1
Snježana Herceg Romanić, Gordana Vuković, Darija Klinčić, Marijana Matek Sarić, Ivan Župan, Davor Antanasijević, Aleksandar Popović
To tackle the ever-present global concern regarding human exposure to persistent organic pollutants (POPs) via food products, this study strived to indicate associations between organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in lake-fish tissue depending on the species and sampling season. Apart from the monitoring initiatives recommended in the Global Monitoring Plan for POPs, the study discussed 7 OCPs and 18 PCB congeners determined in three Cyprinidae species (rudd, carp, and Prussian carp) from Vransko Lake (Croatia), which are widely domesticated and reared as food fish across Europe and Asia...
May 18, 2018: Environmental Research
https://www.readbyqxmd.com/read/29783051/occurrence-and-potential-human-health-risks-of-semi-volatile-organic-compounds-in-drinking-water-from-cities-along-the-chinese-coastland-of-the-yellow-sea
#2
Zekai Li, Fangyu Chang, Peng Shi, Xun Chen, Feng Yang, Qing Zhou, Yang Pan, Aimin Li
Semi-volatile organic compounds (SVOCs) in drinking water have been considered a severe threat to public health worldwide. However, SVOC contamination and the associated human health risks of the drinking water from cities along tributaries of the Yangtze River and Huaihe River in China have been seldom reported. Here, we focused on the occurrence and distribution of a series of SVOCs, mainly including polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), organochlorine pesticides (OCPs) and phthalate esters (PAEs), in drinking water of this region...
May 12, 2018: Chemosphere
https://www.readbyqxmd.com/read/29781753/patterns-in-german-%C3%AA-c-cluster-acquisition
#3
Mehmet Yavaș, Annette Fox-Boyer, Blanca Schaefer
This study reports on the developmental patterns of /ʃC/ clusters in 145 normally developing monolingual German-speaking children between 2;00 and 2;11. All children completed a picture naming task to allow a systematic qualitative analysis of the production patterns. Children's reductions of target /ʃC/clusters are examined and are evaluated with respect to two models, 'factorial typology' and 'headedness', to account for them. The results reveal expected patterns of C2 retention for '/ʃ/+[-continuant]' (e...
May 21, 2018: Clinical Linguistics & Phonetics
https://www.readbyqxmd.com/read/29780948/adrenocorticotropic-hormone-analogue-as-novel-treatment-regimen-in-ocular-cicatricial-pemphigoid
#4
Yael Sharon, David S Chu
Purpose: To report the clinical outcome of a patient with ocular cicatricial pemphigoid, treated with adrenocorticotropic hormone gel. Observations: A 75-year-old female with a biopsy proven ocular cicatricial pemphigoid (OCP) presented with bilateral conjunctival inflammation, fornix shortening, subepithelial fibrosis and corneal scarring. The patient was previously treated with topical steroids, topical cyclosporine and lubricating drops, and had undergone several amniotic membrane transplants due to recurrent corneal erosions...
June 2018: American Journal of Ophthalmology Case Reports
https://www.readbyqxmd.com/read/29778940/pcbs-and-organochlorine-pesticides-in-indoor-environments-a-comparison-of-indoor-contamination-in-canada-and-czech-republic
#5
Ondrej Audy, Lisa Melymuk, Marta Venier, Simon Vojta, Jitka Becanova, Kevin Romanak, Martina Vykoukalova, Roman Prokes, Petr Kukucka, Miriam L Diamond, Jana Klanova
Polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) are restricted compounds that are ubiquitously detected in the environment, including indoor matrices such as air and residential dust. We report concentrations of PCBs and selected OCPs in indoor air and dust from homes in Canada (23 homes) and Czech Republic (20 homes). Indoor air concentrations of PCBs and OCPs were ∼10 times higher than that outdoors. PCB concentrations of ∼450 ng/m3 were similar in both countries, higher in homes built before the restrictions on PCBs, and had congener profiles consistent with PCB mixtures manufactured or used in each country...
May 3, 2018: Chemosphere
https://www.readbyqxmd.com/read/29778896/formation-and-transformation-of-calcium-phosphate-phases-under-biologically-relevant-conditions-experiments-and-modelling
#6
Agnese Carino, Christian Ludwig, Antonio Cervellino, Elisabeth Müller, Andrea Testino
The experimental data on calcium phosphates formation were collected in dilute solution at constant pH (7.40) and temperature (37.0 °C) at different levels of ionic strength (IS). The evolution of the solid phase formation is described in detail using a thermodynamic-kinetic model. The thermodynamic model takes into account all relevant chemical species as well as Posner's clusters; the kinetic model, based on the discretized population balance approach, accounts for the solid formation from solution. The experimental data are consistent with an initial formation of dicalcium phosphate dihydrate (DCPD, brushite), which dominates the nucleation rate, and its rapid transformation into octacalcium phosphate (OCP) or hydroxyapatite (HA), which dominates the growth rate...
May 17, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29777312/evaluating-organochlorine-pesticide-residues-in-the-aquatic-environment-of-the-lake-naivasha-river-basin-using-passive-sampling-techniques
#7
Yasser Abbasi, Chris M Mannaerts
Passive sampling techniques can improve the discovery of low concentrations by continuous collecting the contaminants, which usually go undetected with classic and once-off time-point grab sampling. The aim of this study was to evaluate organochlorine pesticide (OCP) residues in the aquatic environment of the Lake Naivasha river basin (Kenya) using passive sampling techniques. Silicone rubber sheet and Speedisk samplers were used to detect residues of α-HCH, β-HCH, γ-HCH, δ-HCH, heptachlor, aldrin, heptachlor epoxide, pp-DDE, endrin, dieldrin, α-endosulfan, β-endosulfan, pp-DDD, endrin aldehyde, pp-DDT, endosulfan sulfate, and methoxychlor in the Malewa River and Lake Naivasha...
May 18, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29775944/alterations-of-cytochrome-p450-and-the-occurrence-of-persistent-organic-pollutants-in-tilapia-caged-in-the-reservoirs-of-the-igua%C3%A3-u-river
#8
F Y Yamamoto, G D Diamante, M S Santana, D R Santos, R Bombardeli, C C Martins, C A Oliveira Ribeiro, D Schlenk
Environmental chemicals originating from human activities, such as persistent organic pollutants (POPs), may interfere with the endocrine system of aquatic organisms. The effect of these chemicals on biota and human populations is of high public concern but remains poorly understood, especially in aquatic environments of South America. The aim of this study was to investigate the bioavailability of POPs and the related effects in caged male tilapia (Oreochromis niloticus) in four cascading reservoirs of the Iguaçu River, Southern Brazil...
May 15, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29770987/synthesis-of-azaphosphinines-by-directed-inverse-electron-demand-hetero-diels-alder-reactions-with-na-ocp
#9
Max M Hansmann
Herein, a straightforward synthetic approach towards azaphosphinines is reported. The synthesis of 1,3- and 1,4-aza-λ3-phosphinines as well as 1,2,4-diaza-λ3-phosphinines by inverse electron demand hetero-Diels-Alder reactions of sodium 2-phosphaethynolate [NaOCP] with triazines and tetrazines is studied. In the case of 1,2,4-triazines a hetero-D.A. reaction was developed which relies on a new directing group approach based on the complexation of sodium to form an ionic Do->Na-OCP tether. The first X-ray characterization data for aza-λ3-phosphinines as well as the first phosphinine triflates are presented...
May 17, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29770548/the-chemistry-of-the-2-phosphaethynolate-anion
#10
Hansjörg Grützmacher, José Goicoechea
Likely the first synthesis of the phosphaethynolate anion, PCO-, was performed already in 1894 when NaPH2 was reacted with CO in an attempt to make Na(CP) under elimination of water. This reaction was repeated only 117 years later when it was discovered that Na(OCP) and H2 are the products of this remarkable transformation. Li(OCP) was synthesized and fully characterized in 1992 but this salt proved to be too unstable to allow a detailed investigation. Remarkably, it needs the heavier analogues of this lithium salt, Na(OCP) and K(OCP), which are remarkably stable and can be even dissolved in water, to fully explore fully the chemistry of this new functional group...
May 17, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29768947/linking-back-to-back-stimulation-cycles-with-oral-contraceptives-or-progestins-in-women-undergoing-embryo-accumulation-for-preimplantation-genetic-testing-a-retrospective-study
#11
Jorge Rodriguez-Purata, Marta Devesa, Mónica Parriego, Clara Pardos, Ignacio Rodriguez, Nikolaos P Polyzos, Francisca Martínez, Buenaventura Coroleu
This retrospective study was carried out to determine which strategy is associated with improved outcomes in two back-to-back cycles when undergoing embryo accumulation. Eighty patients with two stimulation cycles performed with <45 days between retrievals between Jan'16-Mar'17 were included. Patients were segregated according to the strategy used to link stimulations: spontaneous menses (SM), vaginal micronized progesterone (VMP) or oral contraceptive pills (OCP). Main outcome measure was oocytes retrieved...
May 17, 2018: Gynecological Endocrinology
https://www.readbyqxmd.com/read/29764339/determination-of-plasma-concentrations-of-organochlorine-pesticides-and-polychlorinated-biphenyls-in-pet-cats-and-dogs
#12
Oguzhan Yavuz, Handan Hilal Arslan, Cagatay Esin, Yavuz Kursad Das, Abdurrahman Aksoy
The aim of this study was the determination of plasma concentrations of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in cats and dogs and evaluation of their prevalence and possible effects. The concentrations of nine OCPs, such as α-hexachlorocyclohexane (HCH), β-HCH, γ-HCH, hexachlorobenzene (HCB), aldrin, 2,4'-dichlorodiphenyltrichloroethane (2,4'-DDT), 4,4'-DDT, 2,4'-dichlorodiphenyldichloroethylene (2,4'-DDE) and 4,4'-DDE and 16 PCBs (PCB-28, -52, -70, -74, -81, -99, -101, -118, -138, -153, -156, -170, -180, -183, -187 and -208) were evaluated in the plasma samples of pet cats ( n = 15) and dogs ( n = 21)...
January 1, 2018: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/29758859/food-web-contaminant-dynamics-of-a-large-atlantic-slope-river-implications-for-common-and-imperiled-species
#13
Tiffany N Penland, Casey A Grieshaber, Thomas J Kwak, W Gregory Cope, Ryan J Heise, Forrest W Sessions
Persistent and bioaccumulative contaminants often reach concentrations that threaten aquatic life by causing alterations in organism behavior and development, disruption of biological processes, reproductive abnormalities, and mortality. The objectives of this research were to determine the aquatic food web structure and trophic transfer and accumulation of contaminants within a riverine ecosystem and identify potential stressors to the health of an imperiled fish, the robust redhorse (Moxostoma robustum) and other species of conservation concern in a large Atlantic Slope (USA) river...
August 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29756183/effects-of-heavy-metal-species-concentrations-and-speciation-on-pentachlorophenol-sorption-by-river-biofilms
#14
Xiuyi Hua, Liting Wang, Liwen Zhang, Deming Dong, Zhiyong Guo
The sorption of trace organic pollutants at solid/liquid interfaces is one of the most important processes that influence their fate and behaviours in the aquatic environment. Sorption is affected by coexisting contaminants. The process and extent to which coexisting heavy metals affect the sorption of organochlorine pesticides (OCPs), especially acid radical anion heavy metals, are still unclear. Here, the effects of the species, concentrations, and speciation of the heavy metals Cu, Pb, and Cr, and the metalloid As on the sorption of pentachlorophenol (PCP), as a model OCP, by river biofilms were investigated through batch experiments...
May 13, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29753250/levels-and-risk-assessment-of-hydrocarbons-and-organochlorines-in-aerosols-from-a-north-african-coastal-city-bizerte-tunisia
#15
Badreddine Barhoumi, Javier Castro-Jiménez, Catherine Guigue, Madeleine Goutx, Richard Sempéré, Abdelkader Derouiche, Amani Achour, Soufiane Touil, Mohamed Ridha Driss, Marc Tedetti
The aim of this study was to assess, for the first time, the concentrations, sources, dry deposition and human health risks of polycyclic aromatic hydrocarbons (PAHs), aliphatic hydrocarbons (AHs), polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) in total suspended particle (TSP) samples collected in Bizerte city, Tunisia (North Africa), during one year (March 2015-January 2016). Concentrations of PAHs, AHs, PCBs and OCPs ranged 0.5-17.8 ng m-3 , 6.7-126.5 ng m-3 , 0.3-11 pg m-3 and 0...
May 9, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29751431/depositional-history-of-polychlorinated-biphenyls-pcbs-organochlorine-pesticides-ocps-and-polycyclic-aromatic-hydrocarbons-pahs-in-an-amazon-estuary-during-the-last-century
#16
Patrícia A Neves, Fernanda I Colabuono, Paulo A L Ferreira, Silvia K Kawakami, Satie Taniguchi, Rubens C L Figueira, Michel M Mahiques, Rosalinda C Montone, Márcia C Bícego
The sources and depositional history of OCPs (organochlorine pesticides), PCBs (polychlorinated biphenyls) and PAHs (polycyclic aromatic hydrocarbons) over the last 100years were determined in two sediment cores collected in the Amazon region. It was possible to distinguish two depositional periods along the cores. The first period occurred before extensive anthropogenic effects were registered in the sediments. During this time interval, the concentrations of all OCPs and PCBs were below the detection limits (DL), and the PAH concentrations were low and essentially constant (58...
February 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29748733/residues-of-organochlorine-pesticides-ocps-in-aquatic-environment-and-risk-assessment-along-shaying-river-china
#17
Ying Bai, Xiaohong Ruan, J P van der Hoek
Organochlorine pesticides (OCPs) are pesticides with global scale ubiquity, persistence and bioaccumulation, which leave long-term residuals in the water body. OCPs' high toxicity poses significant threats to human health and aquatic biodiversity, making assessment of OCPs' impact on aquatic ecology and human health urgently necessary. In this research, the presence of 16 OCPs in surface water and groundwater along Shaying River, China, as well as OCPs concentration correlations, was investigated at 24 selected sampling sites...
May 10, 2018: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/29744417/structural-modification-of-titanium-surface-by-octacalcium-phosphate-via-pulsed-laser-deposition-and-chemical-treatment
#18
I V Smirnov, J V Rau, M Fosca, A De Bonis, A Latini, R Teghil, V I Kalita, A Yu Fedotov, S V Gudkov, A E Baranchikov, V S Komlev
In the present study, the Pulsed Laser Deposition (PLD) technique was applied to coat titanium for orthopaedic and dental implant applications. Calcium carbonate (CC) was used as starting coating material. The deposited CC films were transformed into octacalcium phosphate (OCP) by chemical treatments. The results of X-ray diffraction (XRD), Raman, Fourier Transform Infrared Spectroscopy (FTIR) and scanning electron microscopy (SEM) studies revealed that the final OCP thin films are formed on the titanium surface...
June 2017: Bioactive Materials
https://www.readbyqxmd.com/read/29735922/association-between-organochlorine-pesticide-levels-in-breast-milk-and-their-effects-on-female-reproduction-in-a-taiwanese-population
#19
Men-Wen Chen, Harvey M Santos, Danielle E Que, Yan-You Gou, Lemmuel L Tayo, Yi-Chyun Hsu, Young-Bin Chen, Fu-An Chen, How-Ran Chao, Kuo-Lin Huang
Only few studies have focused on organochlorine pesticides (OCPs) in breast milk and the related health risks for women in Taiwan. Our goal is to examine breast milk OCPs and their associations with female reproductive function (infertility, gynecological diseases, and menstruation characteristics) as well as their correlation with sociodemographic parameters (age, pre-pregnant body mass index (BMI), annual incomes, population, birth year, and parity) and dietary habit. The breast milk samples were collected in southern Taiwan ( n = 68) from 2013 to 2016 and the OCP residues were analyzed using high resolution gas chromatography with low resolution mass spectrometry (HRGC/LRMS)...
May 7, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29735280/hyper-crosslinked-polymer-nanoparticles-as-the-solid-phase-microextraction-fiber-coating-for-the-extraction-of-organochlorines
#20
Wenchang Wang, Wenjin Wang, Shuaihua Zhang, Zhi Li, Chun Wang, Zhi Wang
A hyper-crosslinked polymer benzenedimethanol (HCP-BDM) was synthesized and explored as a solid-phase microextraction (SPME) fiber coating material. To prepare the HCP-BDM, 1,4-benzenedimethanol monomer was self-condensed via a simple Friedel-Crafts alkylation reaction. The physical-chemical properties of the HCP-BDM material were characterized by infrared spectroscopy, scanning electron microscopy, thermogravimetric and analysis nitrogen adsorption-desorption isotherms. The HCP-BDM coated fiber demonstrated excellent adsorption performance for some organochlorine pesticides (OCPs)...
May 2, 2018: Journal of Chromatography. A
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