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https://www.readbyqxmd.com/read/29455352/electrokinetic-fenton-remediation-of-organochlorine-pesticides-from-historically-polluted-soil
#1
Maofei Ni, Shulei Tian, Qifei Huang, Yanmei Yang
Soil contamination by persistent organic pollutants (POPs) poses a great threat to historically polluted soil worldwide. In this study, soils were characterized, and organochlorine pesticides contained in the soils were identified and quantified. Individual electrokinetic (IE), EK-Fenton-coupled technologies (EF), and enhanced EK-Fenton treatment (E-1, E-2, and E-3) were applied to remediate soils contaminated with hexachloro-cyclohexane soprocide (HCH) and dichloro-diphenyl-trichloroethane (DDT). Variation of pH, electrical conductivity, and electroosmotic flow was evaluated during the EK-Fenton process...
February 17, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29453181/fish-consumption-from-urban-impoundments-what-are-the-health-risks-associated-with-ddts-and-other-organochlorine-pesticides-in-fish-to-township-residents-of-a-major-inland-city
#2
Wihan Pheiffer, Nico J Wolmarans, Ruan Gerber, Yared B Yohannes, Yoshinori Ikenaka, Mayumi Ishizuka, Nico J Smit, Victor Wepener, Rialet Pieters
Organochlorine pesticides (OCPs) in South Africa have for the most part been banned, except dichlorodiphenyltrichloroethane (DDT) which is still used as malaria vector control. The aim of this study was to determine OCP residues in the aquatic fauna of one of South Africa's most populated areas, Soweto. Risk to human health through OCP exposure via fish consumption was investigated. Clarias gariepinus was chosen as bioindicator because it is an apex predator that is in abundance, but is also a valued food source...
February 13, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29432467/a-drift-diffusion-checkpoint-model-predicts-a-highly-variable-and-growth-factor-sensitive-portion-of-the-cell-cycle-g1-phase
#3
Zack W Jones, Rachel Leander, Vito Quaranta, Leonard A Harris, Darren R Tyson
Even among isogenic cells, the time to progress through the cell cycle, or the intermitotic time (IMT), is highly variable. This variability has been a topic of research for several decades and numerous mathematical models have been proposed to explain it. Previously, we developed a top-down, stochastic drift-diffusion+threshold (DDT) model of a cell cycle checkpoint and showed that it can accurately describe experimentally-derived IMT distributions [Leander R, Allen EJ, Garbett SP, Tyson DR, Quaranta V. Derivation and experimental comparison of cell-division probability densities...
2018: PloS One
https://www.readbyqxmd.com/read/29426206/first-results-on-zooplankton-community-composition-and-contamination-by-some-persistent-organic-pollutants-in-the-gulf-of-tadjoura-djibouti
#4
G Boldrocchi, Y Moussa Omar, D Rowat, R Bettinetti
The Gulf of Tadjoura is located in the Horn of Africa and is widely recognized as an important site where the zooplanktivorous whale sharks seasonally aggregate from October to February. The surface zooplankton community (0-3m) was weekly sampled from November 2016 to February 2017 in two sites during the whale shark aggregation period. A total of 12 phyla were identified. Copepoda represented the most abundant and diverse group with 29 different genera, and contributed with an average of 82% of the mean zooplankton density of approximately 6600indm-3...
February 2, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29421736/associations-between-ddt-and-egg-parameters-of-the-house-sparrow-passer-domesticus-from-the-thohoyandou-area-of-south-africa
#5
L Steyn, H Bouwman, J N Maina
This study investigated whether the pesticide DDT (Dichlorodiphenyltrichloroethane) and its metabolites, DDE (Dichlorodiphenyldichloroethylene) and DDD (Dichlorobischlorophenylethane) were associated with adverse effects on multiple endpoints of the eggs of House Sparrows from the Thohoyandou area in South Africa, where DDT is used for malaria control. Eggshell thickness, pore numbers, pore shapes, and volume densities of the pores were measured to test possible adverse effects. Analysis was done using a scanning electron microscope and the concentrations of the pesticides were determined with the aid of gas chromatography-mass spectrometry...
February 2, 2018: Chemosphere
https://www.readbyqxmd.com/read/29421401/association-between-prenatal-exposure-to-multiple-insecticides-and-child-body-weight-and-body-composition-in-the-vhembe-south-african-birth-cohort
#6
Eric Coker, Jonathan Chevrier, Stephen Rauch, Asa Bradman, Muvhulawa Obida, Madelein Crause, Riana Bornman, Brenda Eskenazi
BACKGROUND: Pregnant women may be co-exposed to multiple insecticides in regions where both pyrethroids and dichlorodiphenyltrichloroethane (DDT) are used for indoor residual spraying (IRS) for malaria control. Despite the potential for adverse effects on offspring, there are few studies in areas where IRS is currently used and little is known about the effects of pyrethroids on children's health. METHODS: We investigated the relationship between concentrations of four urinary pyrethroid metabolites in urine and organochlorine pesticide concentrations in maternal blood collected near delivery on body weight and body composition among children ≤2 years old participating in the prospective South Africa VHEMBE birth cohort (N = 708)...
February 1, 2018: Environment International
https://www.readbyqxmd.com/read/29408922/the-effect-of-metal-pollution-on-the-life-history-and-insecticide-resistance-phenotype-of-the-major-malaria-vector-anopheles-arabiensis-diptera-culicidae
#7
Shüné V Oliver, Basil D Brooke
Metal exposure is one of the commonest anthropogenic pollutants mosquito larvae are exposed to, both in agricultural and urban settings. As members of the Anopheles gambiae complex, which contains several major malaria vector species including An. arabiensis, are increasingly adapting to polluted environments, this study examined the effects of larval metal exposure on various life history traits of epidemiological importance. Two laboratory strains of An. arabiensis, SENN (insecticide susceptible) and SENN DDT (insecticide resistant), were reared in maximum acceptable toxicity concentrations, (MATC-the highest legally accepted concentration) of cadmium chloride, lead nitrate and copper nitrate...
2018: PloS One
https://www.readbyqxmd.com/read/29404880/residues-and-sources-of-organochlorine-pesticides-in-soils-of-elementary-schools-and-communities-in-wenchuan-5-12-earthquake-affected-areas
#8
Qiangbin Zhang, Wei Huang, Xianlei Zhu, Qinping Song, Zhihua Fan
The disinfectants and pesticides extensively used after Wenchuan 5.12 Earthquake on May 12, 2008 (so-called Wenchuan 5.12 Earthquake), for epidemic prevention purpose can raise great concerns of environmental pollution and potential personal exposure. To investigate the soil pollution caused by the intensive application in earthquake-affected areas, surface soil samples from two elementary schools, two communities and two background areas were collected in Beichuan County and Dujiangyan City once per location in spring and in autumn in 2011 and then analyzed by gas chromatography/mass spectrometry for organochlorine pesticides (OCPs)...
February 5, 2018: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/29396601/rad5-coordinates-translesion-dna-synthesis-pathway-by-recognizing-specific-dna-structures-in-saccharomyces-cerevisiae
#9
Qifu Fan, Xin Xu, Xi Zhao, Qian Wang, Wei Xiao, Ying Guo, Yu V Fu
DNA repair is essential to maintain genome integrity. In addition to various DNA repair pathways dealing with specific types of DNA lesions, DNA damage tolerance (DDT) promotes the bypass of DNA replication blocks encountered by the replication fork to prevent cell death. Budding yeast Rad5 plays an essential role in the DDT pathway and its structure indicates that Rad5 recognizes damaged DNA or stalled replication forks, suggesting that Rad5 plays an important role in the DDT pathway choice. It has been reported that Rad5 forms subnuclear foci in the presence of methyl methanesulfonate (MMS) during the S phase...
February 2, 2018: Current Genetics
https://www.readbyqxmd.com/read/29373146/alterations-in-male-reproductive-hormones-in-relation-to-environmental-ddt-exposure
#10
Maria Bornman, Rhena Delport, Paulina Farías, Natalie Aneck-Hahn, Sean Patrick, Robert P Millar, Christiaan de Jager
DDT [1, 1, 1-trichloro-2,2-bis (p-chlorophenyl)-ethane] compounds are used for indoor residual spraying (IRS) to control malaria mosquitoes. DDT is an endocrine disruptor chemical in experimental conditions, but little is known of adverse effects related to living conditions with continual uptake across a time span by all possible means of exposure. Based on estrogenic and/or anti-androgenic effects found in animal studies, we hypothesized that chronic DDT/DDE exposures in men may be associated with changes in male reproductive hormones...
January 17, 2018: Environment International
https://www.readbyqxmd.com/read/29372474/optimal-conditions-and-the-advantages-of-using-laser-microdissection-and-liquid-chromatography-tandem-mass-spectrometry-for-diagnosing-renal-amyloidosis
#11
Michiko Aoki, Dedong Kang, Akira Katayama, Naomi Kuwahara, Shinya Nagasaka, Yoko Endo, Mika Terasaki, Shinobu Kunugi, Yasuhiro Terasaki, Akira Shimizu
BACKGROUND: Liquid chromatography-tandem mass spectrometry (LC-MS/MS) has recently been utilized to accurately detect the amyloid proteins of renal amyloidosis. The present study investigated the optimal procedures for analyzing samples by LCMS/MS, and the advantage of using this technique to diagnosis renal amyloidosis. METHODS: To detect amyloid proteins, laser microdissected glomeruli from AL (n = 13) or AA (n = 10) renal amyloidosis patients were digested and analyzed by LCMS/MS...
January 25, 2018: Clinical and Experimental Nephrology
https://www.readbyqxmd.com/read/29367922/baseline-susceptibility-of-filarial-vector-culex-quinquefasciatus-diptera-culicidae-to-five-insecticides-with-different-modes-of-action-in-southeast-of-iran
#12
Yaser Salim-Abadi, Mohammad Asadpour, Iraj Sharifi, Alireza Sanei-Dehkordi, Mohammad Amin Gorouhi, Azim Paksa, Zohre Tayyebi, Abbas Aghaei-Afshar
Background: Culex quinquefasciatus (Diptera: Culicidae) is an important vector for many human diseases. The aim of this study was to evaluate the susceptibility level of larval and adult stages of Cu. quinquefasciatus to different groups of WHO recommended insecticides for vector control. Methods: Larval stages of the Culex mosquitoes were collected from their natural habitats in Rafsanjan County at Kerman Province, southeast of Iran in 2016. Insecticide susceptibility status of adult female Cx...
December 2017: Journal of Arthropod-borne Diseases
https://www.readbyqxmd.com/read/29357900/insecticide-resistance-and-target-site-mutations-g119s-ace-1-and-l1014f-kdr-of-culex-pipiens-in-morocco
#13
Fatim-Zohra Tmimi, Chafika Faraj, Meriem Bkhache, Khadija Mounaji, Anna-Bella Failloux, M'hammed Sarih
BACKGROUND: Control of the mosquito vector Culex pipiens with insecticides is the main way to control arboviruses that the species can transmit such as West Nile virus (WNV) and Rift Valley fever virus (RVFV). However, its efficiency has been hampered by the emergence of insecticide resistance. Little is known about the insecticide-resistance status and underlying resistance mechanisms of field-collected populations of Cx. pipiens in Morocco. METHODS: Mosquito adults from Mohammadia city in Morocco were reared from immature stages...
January 22, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29354855/combined-treatment-of-contaminated-soil-with-a-bacterial-stenotrophomonas-strain-dxz9-and-ryegrass-lolium-perenne-enhances-ddt-and-dde-remediation
#14
Hui Xie, Lusheng Zhu, Jun Wang
Bioremediation of contaminated soils by a combinational approach using specific bacterial species together with ryegrass is a promising strategy, resulting in potentially highly efficient degradation of organic contaminants. The present study tested the combination of strain DXZ9 of Stenotrophomonas sp. with ryegrass to remove DDT and DDE contaminants from soil under natural conditions in a pot experiment. The strain DXZ9 was successfully colonized in the natural soil, resulting in removal rates of approximately 77% for DDT, 52% for DDE, and 65% for the two pollutants combined after 210 days...
January 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29345919/using-isomeric-and-metabolic-ratios-of-ddt-to-identify-the-sources-and-fate-of-ddt-in-chinese-agricultural-topsoil
#15
Chong Zhang, Li Liu, Yan Ma, Fasheng Li
The metabolic ratio of (p,p'-DDE + p,p'-DDD)/p,p'-DDT or p,p'-DDE/p,p'-DDT has been used previously to estimate the approximate half-life of p,p'-DDT, with a relatively unclear concept of "old" and "new" sources of p,p'-DDT and without paying attention to the influence by dicofol-type DDT contributed from the more recent usage of dicofol. Based on the isomeric ratio of o,p'-DDT/p,p'-DDT to distinguish the sources of DDT, this study used the corrected metabolic ratio of (p,p'-DDE + p,p'-DDD)/p,p'-DDT to estimate a more accurate half-life of p,p'-DDT using a model-based approach...
January 18, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29336138/psycho-acoustical-measures-in-individuals-with-congenital-visual-impairment
#16
Kaushlendra Kumar, Teenu Thomas, Jayashree S Bhat, Rajesh Ranjan
INTRODUCTION: In congenital visual impaired individuals one modality is impaired (visual modality) this impairment is compensated by other sensory modalities. There is evidence that visual impaired performed better in different auditory task like localization, auditory memory, verbal memory, auditory attention, and other behavioural tasks when compare to normal sighted individuals. OBJECTIVE: The current study was aimed to compare the temporal resolution, frequency resolution and speech perception in noise ability in individuals with congenital visual impaired and normal sighted...
December 1, 2017: International Tinnitus Journal
https://www.readbyqxmd.com/read/29329097/sources-and-transformation-pathways-for-dichlorodiphenyltrichloroethane-ddt-and-metabolites-in-soils-from-northwest-fujian-china
#17
Huanfang Huang, Yuan Zhang, Wei Chen, Wenwen Chen, Dave A Yuen, Yang Ding, Yingjie Chen, Yao Mao, Shihua Qi
Dicofol (2,2,2-trichloro-1,1-bis-(p-chlorophenyl)ethanol) found in the environment is not only a miticide originated from commercial use, but also a metabolite of dichlorodiphenyltrichloroethane (DDT), which is often overlooked. To verify the sources and transformation pathways of DDT and related metabolites in soils, we measured p,p'-(dicofol + DBP) (sum of p,p'-dicofol and 4,4'-dichlorobenzophenone), DDT and six metabolites in soils from Northwest Fujian, China. The ratios of 1,1,1-trichloro-2-(o-chlorophenyl)-2-(p-chlorophenyl)ethane (o,p'-DDT)/1,1,1-trichloro-2,2-bis-(p-chlorophenyl)ethane (p,p'-DDT) and the mass balance demonstrated that p,p'-(dicofol + DBP) predominantly originated from p,p'-DDT transformation rather than from actual dicofol application...
January 9, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29318322/persistent-organochlorine-pollutants-in-placentas-sampled-from-women-in-croatia-and-an-evaluation-of-their-dna-damaging-potential-in-vitro
#18
Davor Želježić, Snježana Herceg Romanić, Darija Klinčić, Marijana Matek Sarić, Judita Grzunov Letinić
This study investigated the levels and distribution of 17 polychlorinated biphenyls (PCBs) and organochlorine pesticides (HCB, α-HCH, β-HCH, γ-HCH, p,p'-DDE, p,p'-DDD, and p,p'-DDT) in placenta samples from women living in the coastal area of Croatia. During November 2012 to February 2013, 51 placenta samples were collected from healthy mothers. This study presents the first report about Croatian placenta samples. Each of the analysed compounds were found in all of the samples; all of the maximum values were < 1 ng g-1 w...
January 9, 2018: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29316917/an-observational-analysis-of-the-impact-of-indoor-residual-spraying-with-non-pyrethroid-insecticides-on-the-incidence-of-malaria-in-s%C3%A3-gou-region-mali-2012-2015
#19
Joseph Wagman, Christelle Gogue, Kenzie Tynuv, Jules Mihigo, Elie Bankineza, Mamadou Bah, Diadier Diallo, Andrew Saibu, Jason H Richardson, Diakalkia Kone, Seydou Fomba, Jeff Bernson, Richard Steketee, Laurence Slutsker, Molly Robertson
BACKGROUND: Ségou Region in Central Mali is an area of high malaria burden with seasonal transmission, high access to and use of long-lasting insecticidal nets (LLINs), and resistance to pyrethroids and DDT well documented in Anopheles gambiae s.l. (the principal vector of malaria in Mali). Ségou has recently received indoor residual spraying (IRS) supported by Mali's collaboration with the US President's Malaria Initiative/Africa Indoor Residual Spraying programme. From 2012 to 2015, two different non-pyrethroid insecticides: bendiocarb in 2012 and 2013 and pirimiphos-methyl in 2014 and 2015, were used for IRS in two districts...
January 10, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29307071/dietary-exposure-to-hch-and-ddt-congeners-and-their-associated-cancer-risk-based-on-pakistani-food-consumption
#20
Muhammad Aamir, Sardar Khan, Gang Li
Dietary exposure to organochlorine pesticides such as hexachlorocyclohexane (HCH) and dichlorodiphenyltrichloroethane (DDT) congeners was assessed using diet study approach, and for this purpose, different food items were collected in August 2014. The levels of ∑(HCHs + DDTs) in different food groups were ranged from 2.57 to 206 ng g-1, ww, with contamination order of fish > poultry > milk > vegetables > cereals > flour > fruits. In the present study, the ratios of β-HCH/∑HCH (0.19-0...
January 6, 2018: Environmental Science and Pollution Research International
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