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https://www.readbyqxmd.com/read/28332084/molecularly-imprinted-membranes-mims-for-selective-removal-of-polychlorinated-biphenyls-pcbs-in-environmental-waters-fabrication-and-characterization
#1
Dennis S Mkhize, Hlengilizwe Nyoni, Laura P Quinn, Bhekie B Mamba, Titus A M Msagati
Molecularly imprinted membranes (MIMs) with selective removal properties for polychlorinated biphenyls (PCBs) were prepared through the phase inversion technique. The MIMs were obtained from casting the viscous solutions of molecularly imprinted polymers (MIPs), polysulfone (PSf), and N-methyl-2-pyrrolidone (NMP) as the casting solvent. Different membranes were prepared at different concentration of MIPs and PSf. The resulting MIMs were characterized by atomic force microscope (AFM), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR)...
March 22, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28330701/modeling-malaria-control-intervention-effect-in-kwazulu-natal-south-africa-using-intervention-time-series-analysis
#2
Osadolor Ebhuoma, Michael Gebreslasie, Lethumusa Magubane
The change of the malaria control intervention policy in South Africa (SA), re-introduction of dichlorodiphenyltrichloroethane (DDT), may be responsible for the low and sustained malaria transmission in KwaZulu-Natal (KZN). We evaluated the effect of the re-introduction of DDT on malaria in KZN and suggested practical ways the province can strengthen her already existing malaria control and elimination efforts, to achieve zero malaria transmission. We obtained confirmed monthly malaria cases in KZN from the malaria control program of KZN from 1998 to 2014...
March 18, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28329734/elevated-mif-2-levels-predict-mortality-in-critically-ill-patients
#3
Julia Pohl, Ulrike B Hendgen-Cotta, Pia Stock, Peter Luedike, Tienush Rassaf
PURPOSE: D-dopachrome tautomerase (MIF-2 or DDT) is a member of the macrophage migration inhibitory factor (MIF) superfamily and a close structural homolog to MIF. Circulating MIF-2 has been described to be elevated in patients suffering from sepsis, severe burn injury and after surgery. We sought to evaluate the prognostic value of MIF-2 in critically ill patients. METHODS: A total of 72 patients were studied upon admission to the medical intensive care unit (ICU)...
March 16, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/28329713/pcbs-and-ocps-in-human-milk-in-eastern-siberia-russia-levels-temporal-trends-and-infant-exposure-assessment
#4
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/28325102/building-up-and-breaking-down-mechanisms-controlling-recombination-during-replication
#5
Dana Branzei, Barnabas Szakal
The complete and faithful duplication of the genome is an essential prerequisite for proliferating cells to maintain genome integrity. This objective is greatly challenged by DNA damage encountered during replication, which causes fork stalling and in certain cases, fork breakage. DNA damage tolerance (DDT) pathways mitigate the effects on fork stability induced by replication fork stalling by mediating damage-bypass and replication fork restart. These DDT mechanisms, largely relying on homologous recombination (HR) and specialized polymerases, can however contribute to genome rearrangements and mutagenesis...
March 22, 2017: Critical Reviews in Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28324837/status-of-pesticides-pollution-in-tanzania-a-review
#6
REVIEW
Raheli Elibariki, Mihayo Musabila Maguta
Various studies have been conducted in Tanzania to assess the magnitude of pesticides pollution associated with pesticides application, storage, disposal as well as knowledge of farmers on pesticides handling. The studies analysed samples from different matrices covering vegetation, biota, water, sediments and soil. The objective of this review was to summarise the results of pesticides residues reported in different components of the environment to give a clear picture of pesticides pollution status in the country for law enforcement as well as for taking precaution measures...
March 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28320527/characterization-and-genome-functional-analysis-of-the-ddt-degrading-bacterium-ochrobactrum-sp-ddt-2
#7
Xiong Pan, Tianheng Xu, Haoyu Xu, Hua Fang, Yunlong Yu
A strain of Ochrobactrum sp. DDT-2 that was capable of degrading DDT as the sole carbon and energy source was isolated and sequenced, and its biodegradation characteristics and metabolism mechanism were examined. The genome sequence of the isolate DDT-2 was composed of 4,630,303bp with a GC content of 55.99% and 4454 coding genes. The degradation rate of DDT by the isolate DDT-2 increased with the increasing substrate concentration (0.1-10mg/l) and temperature (20-40°C). The degradation half-life of DDT in the presence of the isolate DDT-2 at pH7...
March 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28317032/first-report-of-the-east-african-kdr-mutation-in-an-anopheles-gambiae-mosquito-in-c%C3%A3-te-d-ivoire
#8
Mouhamadou Chouaïbou, Fodjo Behi Kouadio, Emmanuel Tia, Luc Djogbenou
Background. The intensive use of insecticides in public health and agriculture has led to the development of insecticide resistances in malaria vectors across sub-Saharan Africa countries in the last two decades. The kdr target site point mutation which is among the best characterised resistance mechanisms seems to be changing its distribution patterns on the African continent. The 1014F  kdr mutation originally described only in West Africa is spreading to East Africa while the 1014S  kdr mutation originally described in East Africa, is spreading to West and Central Africa...
February 9, 2017: Wellcome Open Res
https://www.readbyqxmd.com/read/28314123/which-persistent-organic-pollutants-in-the-rivers-of-the-bohai-region-of-china-represent-the-greatest-risk-to-the-local-ecosystem
#9
Yueqing Zhang, Andrew C Johnson, Chao Su, Meng Zhang, Monika D Jürgens, Yajuan Shi, Yonglong Lu
Freshwater aquatic organisms can be exposed to hundreds of persistent organic pollutants (POPs) discharged by natural and anthropogenic activities. Given our limited resources it is necessary to identify, from the existing evidence, which is the greatest threat so that control measures can be targeted wisely. The focus of this study was to rank POPs according to the relative risk they represent for aquatic organisms in rivers in the Bohai Region, China. A list of 14 POPs was compiled based on the available data on their presence in these rivers and ecotoxicological data...
February 28, 2017: Chemosphere
https://www.readbyqxmd.com/read/28303674/simultaneous-recording-of-ultrasound-and-polysomnography-during-natural-sleep-in-patients-with-obstructive-sleep-apnea-a-pilot-study
#10
Jeng-Wen Chen, Chih-Chung Huang, Chi-Kai Weng, Chun-Hsiang Chang, Shou-Jen Wang
Tongue base deformation may play a critical role in the phenomenon of obstructive sleep apnea, but polysomnography provides limited information regarding the effect of tongue motion during natural sleep. We reported on preliminary results of combining a novel ultrasound system and polysomnography for simultaneous recordings during natural sleep in volunteers and patients with obstructive sleep apnea. All participants underwent time-synchronized polysomnography and submental transcutaneous ultrasound examinations...
March 17, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28303549/-the-anopheles-gambiae-species-complex-and-kdr-resistance-gene-at-the-periphery-of-douala-cameroon
#11
P Ntonga Akono, A Mbouangoro, A Mbida Mbida, C Ndo, M F Peka Nsangou, S Kekeunou
This study was conducted from May to June 2015 in Yassa (industrialized area) and Logbessou (non-industrialized area), two peri-urban areas of the city of Douala, Cameroon with the aim of an assessment of the spatial distribution of the gambiae complex, the determination of their resistance to insecticides and the distribution of the Kdr mutation. Mosquito larvae were collected by the dipping method and nursed to adult stage. The sensitivity of adult Anopheles gambiae s.l. populations to DDT and pyrethroids was assessed following WHO protocol...
March 16, 2017: Bulletin de la Société de Pathologie Exotique
https://www.readbyqxmd.com/read/28292528/halogenated-organic-pollutants-in-marine-biota-from-the-xuande-atoll-south-china-sea-levels-biomagnification-and-dietary-exposure
#12
Yu-Xin Sun, Yong-Xia Hu, Zai-Wang Zhang, Xiang-Rong Xu, Heng-Xiang Li, Lin-Zi Zuo, Yi Zhong, Hong Sun, Bi-Xian Mai
Six marine biota species were collected from the Xuande Atoll, South China Sea to investigate the bioaccumulation of dichlorodiphenyltrichloroethane (DDT), polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), decabromodiphenyl ethane (DBDPE) and dechlorane plus (DP). Pike conger (Muraenesox talabonoides) had the highest concentrations of halogenated organic pollutants (HOPs) among the six marine biota species. DDTs were the predominant HOPs, followed by PCBs and PBDEs, with minor contributions of DBDPE and DP...
March 11, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28284117/remediation-of-organochlorine-pesticides-contaminated-lake-sediment-using-activated-carbon-and-carbon-nanotubes
#13
Shan Hua, Ji-Lai Gong, Guang-Ming Zeng, Fu-Bing Yao, Min Guo, Xiao-Ming Ou
Organochlorine pesticides (OCPs) in sediment were a potential damage for humans and ecosystems. The aim of this work was to determine the effectiveness of carbon materials remedy hexachlorocyclohexane (HCH) and dichlorodiphenyltrichloroethanes (DDTs) in sediment. Two different carbon materials including activated carbon (AC) and multi-walled carbon nanotubes (MWCNTs) were used in the present research. Sediment treated with 2 wt% AC and MWCNTs after 150 d contact showed 97%, and 75% reduction for HCH, and 93% and 59% decrease for DDTs in aqueous equilibrium concentration, respectively...
March 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/28281068/indicator-polychlorinated-biphenyls-pcbs-and-organochlorine-pesticides-ocps-in-seafood-from-xiamen-china-levels-distributions-and-risk-assessment
#14
Zhuozhen Qian, Fangfang Luo, Chengye Wu, Ran Zhao, Xuan Cheng, Wenfeng Qin
Indicator polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) were determined in 289 seafood samples including fishes, crustaceans, and shellfish collected from six administrative regions in Xiamen of China. The residual levels of PCBs, dichlorodiphenyltrichloroethane and its metabolites (DDTs), and hexachlorocyclohexanes (HCHs) ranged <LOD-64 (median 1.8) ng g(-1) wet weight (ww), 0.03-88 (median 1.4) ng g(-1) ww, and <LOD-5.5 (median <LOD) ng g(-1) ww, respectively. The most abundant compounds were PCB101, p,p'-DDT, and β-HCH...
March 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28280510/determination-of-levels-of-organochlorine-organophosphorus-and-pyrethroid-pesticide-residues-in-vegetables-from-markets-in-dar-es-salaam-by-gc-ms
#15
John A M Mahugija, Farhat A Khamis, Esther H J Lugwisha
This study investigated the levels of pesticides and metabolites in vegetables from major markets in Dar es Salaam city, Tanzania. Samples of fresh cabbage, spinach, and onions from the markets were analysed for pesticide residues. Extraction was performed using acetone followed by dichloromethane : cyclohexane mixture and the extracts were cleaned up using Florisil. The compounds were determined by gas chromatography-mass spectrometry (GC-MS). Pesticides and metabolites were detected in 72.2% of the samples...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28277312/organochlorinated-pesticides-levels-in-a-representative-sample-of-the-spanish-adult-population-the-bioambient-es-project
#16
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/28274604/comparative-analysis-of-microbial-communities-during-enrichment-and-isolation-of-ddt-degrading-bacteria-by-culture-dependent-and-independent-methods
#17
Beibei Wang, Wuxing Liu, Xiaoyan Liu, Ashley E Franks, Ying Teng, Yongming Luo
Microcosms for enrichment of DDT degrading microorganisms were monitored using culture-dependent and -independent methods. Culture dependent methods isolated several strains with DDT degradation potential, Pseudomonas species being the most frequent. One isolate, Streptomyces sp. strain D3, had a degradation rate of 77% with 20mgL(-1) of DDT after 7days incubation, D3 also had degradation rates of 75% and 30% for PCB77 (3,3',4,4'-tetrachloro biphenyl) and PCNB (pentachloronitrobenzene) respectively. Culture-independent high-throughput sequencing identified a different subset of the microbial community within the enrichment microcosms to the culture dependent method...
March 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28273534/levels-and-profiles-of-organohalogenated-contaminants-in-human-blood-from-egypt
#18
Mohamed Abou-Elwafa Abdallah, Amen Hamdy Zaky, Adrian Covaci
Concentrations of polybrominated diphenyl ethers (PBDEs), polychlorinated biphenyls (PCBs) and some organochlorine pesticides (OCPs) were determined in serum of Egyptian colorectal cancer patients (n = 35) and compared to a healthy control group (n = 32). p,p'-DDE (the major metabolite of DDT) was the most frequently detected contaminant with the highest concentration (median = 131 ng/g lw) in all studied serum samples. BDE-209 was the least frequently detected contaminant with a median concentration <0...
March 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/28271351/distribution-and-residue-profile-of-organochlorine-pesticides-and-polychlorinated-biphenyls-in-sediment-and-fish-of-lake-manzala-egypt
#19
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/28269119/analysis-of-embolic-signals-with-directional-dual-tree-rational-dilation-wavelet-transform
#20
Gorkem Serbes, Nizamettin Aydin
The dyadic discrete wavelet transform (dyadic-DWT), which is based on fixed integer sampling factor, has been used before for processing piecewise smooth biomedical signals. However, the dyadic-DWT has poor frequency resolution due to the low-oscillatory nature of its wavelet bases and therefore, it is less effective in processing embolic signals (ESs). To process ESs more effectively, a wavelet transform having better frequency resolution than the dyadic-DWT is needed. Therefore, in this study two ESs, containing micro-emboli and artifact waveforms, are analyzed with the Directional Dual Tree Rational-Dilation Wavelet Transform (DDT-RADWT)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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