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https://www.readbyqxmd.com/read/29224001/dental-caries-and-developmental-defects-of-enamel-in-the-primary-dentition-of-preterm-infants-case-control-observational-study
#1
Ina Manuela Schüler, Stefanie Haberstroh, Kristin Dawczynski, Thomas Lehmann, Roswitha Heinrich-Weltzien
AIM: Assessment of dental health in the primary dentition of preterm infants (PTI) including investigation of mother- and infant-related risk factors in a case-control study design. MATERIAL AND METHODS: One hundred twenty-eight infants aged 3-4 years were included. Sixty-four PTI (27 males) were randomly selected from the preterm registry of the Jena University Hospital. As a control group served 64 full-term infants (FTI) recruited from the Department of Paediatric Dentistry, matched for age and sex...
December 9, 2017: Caries Research
https://www.readbyqxmd.com/read/29201093/simultaneous-determination-of-residue-from-58-pesticides-in-the-wheat-flour-consumed-in-tehran-iran-by-gc-ms
#2
Mohammad Rezaei, Nabi Shariatifar, Shahram Shoeibi, Maryam Amir Ahmadi, Gholamreza Jahed Khaniki
Food safety has a direct impact on human health and as such is a growing concern worldwide. Presence of harmful pesticide residue in food is a serious cause for concern among consumers so it is important to monitor levels of pesticides in foods. The aim of this study was simultaneous determination of concentrations of 58 pesticides in 40 wheat flour samples collected from Tehran market in January, 2014. The city under study (Tehran) was divided into five districts and samples were collected independently from each district and sourced from different bakeries (n=40)...
2017: Iranian Journal of Pharmaceutical Research: IJPR
https://www.readbyqxmd.com/read/29195489/secondary-sex-ratio-in-relation-to-exposures-to-polychlorinated-biphenyls-dichlorodiphenyl-dichloroethylene-and-methylmercury
#3
Clara Amalie Gade Timmermann, Anna L Choi, Maria Skaalum Petersen, Flemming Nielsen, Esben Budtz-Jørgensen, Pál Weihe, Philippe Grandjean
This study was undertaken to assess the potential impact of maternal exposures to polychlorinated biphenyl (PCB), dichlorodiphenyl dichloroethylene (DDE) and methylmercury on the secondary sex ratios (the ratio of male to female live births) over a span of 23 years. The study includes prospective data from three Faroese birth cohorts, with a total of 2,152 healthy mother-child dyads recruited between 1986 and 2009. The Faroe Islands is a subarctic fishing community, where pilot whale meat and blubber are part of the traditional marine diet...
2017: International Journal of Circumpolar Health
https://www.readbyqxmd.com/read/29195334/local-bifurcations-in-differential-equations-with-state-dependent-delay
#4
Jan Sieber
A common task when analysing dynamical systems is the determination of normal forms near local bifurcations of equilibria. As most of these normal forms have been classified and analysed, finding which particular class of normal form one encounters in a numerical bifurcation study guides follow-up computations. This paper builds on normal form algorithms for equilibria of delay differential equations with constant delay that were developed and implemented in DDE-Biftool recently. We show how one can extend these methods to delay-differential equations with state-dependent delay (sd-DDEs)...
November 2017: Chaos
https://www.readbyqxmd.com/read/29195317/climate-models-with-delay-differential-equations
#5
Andrew Keane, Bernd Krauskopf, Claire M Postlethwaite
A fundamental challenge in mathematical modelling is to find a model that embodies the essential underlying physics of a system, while at the same time being simple enough to allow for mathematical analysis. Delay differential equations (DDEs) can often assist in this goal because, in some cases, only the delayed effects of complex processes need to be described and not the processes themselves. This is true for some climate systems, whose dynamics are driven in part by delayed feedback loops associated with transport times of mass or energy from one location of the globe to another...
November 2017: Chaos
https://www.readbyqxmd.com/read/29195309/class-a-mode-locked-lasers-fundamental-solutions
#6
Anton V Kovalev, Evgeny A Viktorov
We consider a delay differential equation (DDE) model for mode-locked operation in class-A semiconductor lasers containing both gain and absorber sections. The material processes are adiabatically eliminated as these are considered fast in comparison to the delay time for a long cavity device. We determine the steady states and analyze their bifurcations using DDE-BIFTOOL [Engelborghs et al., ACM Trans. Math. Software 28, 1 (2002)]. Multiple forms of coexistence, transformation, and hysteretic behavior of stable steady states and fundamental periodic regimes are discussed in bifurcation diagrams...
November 2017: Chaos
https://www.readbyqxmd.com/read/29168574/dental-enamel-defect-diagnosis-through-different-technology-based-devices
#7
Tatiana Yuriko Kobayashi, Luciana Lourenço Ribeiro Vitor, Cleide Felício Carvalho Carrara, Thiago Cruvinel Silva, Daniela Rios, Maria Aparecida Andrade Moreira Machado, Thais Marchini Oliveira
INTRODUCTION: Dental enamel defects (DEDs) are faulty or deficient enamel formations of primary and permanent teeth. Changes during tooth development result in hypoplasia (a quantitative defect) and/or hypomineralisation (a qualitative defect). OBJECTIVE: To compare technology-based diagnostic methods for detecting DEDs. MATERIAL AND METHODS: Two-hundred and nine dental surfaces of anterior permanent teeth were selected in patients, 6-11 years of age, with cleft lip with/without cleft palate...
November 23, 2017: International Dental Journal
https://www.readbyqxmd.com/read/29165145/organochlorine-pesticide-level-in-patients-with-chronic-kidney-disease-of-unknown-etiology-and-its-association-with-renal-function
#8
Rishila Ghosh, Manushi Siddarth, Neeru Singh, Vipin Tyagi, Pawan Kumar Kare, Basu Dev Banerjee, Om Prakash Kalra, Ashok Kumar Tripathi
BACKGROUND: Involvement of agrochemicals have been suggested in the development of chronic kidney disease of unknown etiology (CKDu). The association between CKDu and blood level of organochlorine pesticides (OCPs) in CKDu patients has been examined in the present study. METHODS: All the recruited study subjects (n = 300) were divided in three groups, namely, healthy control (n = 100), patients with chronic kidney disease of unknown etiology (n = 100), and patients with chronic kidney disease of known etiology (CKDk) (n = 100)...
May 26, 2017: Environmental Health and Preventive Medicine
https://www.readbyqxmd.com/read/29164278/metals-and-organohalogen-contaminants-in-bald-eagles-haliaeetus-leucocephalus-from-ontario-1991-2008
#9
P A Martin, K D Hughes, G D Campbell, J L Shutt
We examined the degree of exposure of lead (Pb), mercury (Hg), and several organohalogen contaminants and its potential impact on survival of bald eagles in Ontario from 1991 to 2008. Overall, results for 43 dead or dying bald eagles collected in the province indicate that 23% (10/43) of birds died of Pb poisoning and 9% (4/43) died of suspected Hg poisoning. Pb poisoning was diagnosed based on exceedances of toxicity thresholds in liver and kidney and supported by clinical observations, necropsy results, and histology findings when available...
November 21, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29161512/trophodynamics-of-organic-pollutants-in-pelagic-and-benthic-food-webs-of-lake-dianchi-importance-of-ingested-sediment-as-uptake-route
#10
Senrong Fan, Beili Wang, Hang Liu, Shixiong Gao, Tong Li, Shuran Wang, Yong Liu, Xueqin Liu, Yi Wan
Habitat is of great importance in determining the trophic transfer of pollutants in freshwater ecosystems; however, the major factors influencing chemical trophodynamics in pelagic and benthic food webs remain unclear. This study investigated the levels of p,p'-dichlorodiphenyldichloroethylene (p,p'-DDE), polycyclic aromatic hydrocarbons (PAHs), and substituted PAHs (s-PAHs) in two plankton species, six invertebrate species, and ten fish species collected from Lake Dianchi in southern China. Relatively high concentrations of PAHs and s-PAHs were detected with total concentrations of 11...
November 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29158161/extension-of-the-transposable-bacterial-virus-family-two-genomic-organisations-among-phages-and-prophages-with-a-tn552-related-transposase
#11
Ariane Toussaint, Frédérique Van Gijsegem
Mu-like transposable phages and prophages have been isolated from, or predicted, in a wide range of bacterial phyla. However, related B3-like transposable phages, which differ in their genome organisation and the DDE transposase and transposition activator they code for have thus far been restricted to a very limited set of hosts. Through sequence similarity searches, we have now expanded the number of predicted B3-like prophages and uncovered a third genomic organisation. These new genomes, although only prophages, further illustrate the previously reported mosaicism existing in the proposed "Saltoviridae" family of Caudovirales, and further support the proposal to move morphology criteria (contractile vs...
November 17, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/29153728/role-of-black-carbon-in-soil-distribution-of-organochlorines-in-lesser-himalayan-region-of-pakistan
#12
Usman Ali, Rahat Riaz, Andrew James Sweetman, Kevin C Jones, Jun Li, Gan Zhang, Riffat Naseem Malik
Black carbon and total organic carbon (TOC) along with organochlorines (OCs) were analyzed in soils from four sampling zones of Lesser Himalayan Region based on source proximity/anthropogenic influences along the altitude. CTO-375 method was used for BC analysis while OCs were analyzed by GC-MS/MS system. BC and TOC ranged between 0.16-1.77 and 6.8-41.3 mg g(-1) while those of OCPs and PCBs ranged between 0.69 and 5.77 and 0.12-2.55 ng g(-1), respectively. ∑DDTs were the dominant (87.9%) among OCPs while tri- and tetra- (65...
November 16, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29148584/metabolic-effects-of-p-p-dde-on-atlantic-salmon-hepatocytes
#13
Pål A Olsvik, Liv Søfteland
Decades after being banned in many countries, DDT and its metabolites are still considered major environmental hazards. The p,p'-DDE isomer, the DDT metabolite found in highest concentration in aquaculture feeds, is an endocrine disruptor with demonstrated ability to induce epigenetic effects. This study aimed at examining the impact of p,p'-DDE on Atlantic salmon. Primary hepatocytes were exposed to four concentrations of p,p'-DDE (0.1, 1, 10, 100 μm) for 48 hours, and endpoints included cytotoxicity, global DNA methylation, targeted transcription and metabolomics profiling (100 μm)...
November 17, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/29146212/the-current-environmental-levels-of-endocrine-disruptors-mercury-cadmium-organochlorine-pesticides-and-pcbs-in-a-belgian-adult-population-and-their-predictors-of-exposure
#14
Catherine Pirard, Stephanie Compere, Katty Firquet, Corinne Charlier
A human biomonitoring study was carried out measuring the levels of endocrine disruptors in 252 participants (18-76 years old) recruited between February and May 2015 from the general population of Liege Province (Belgium). In this study, we reported the recent levels of cadmium and mercury in urine, some organochlorine pesticides and polychlorinated biphenyls (PCBs) in serum, and their relations to demographic characteristics, lifestyle behaviors and dietary habits. The median urinary levels of mercury and cadmium were 0...
October 31, 2017: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/29145101/the-distribution-and-trends-of-persistent-organic-pollutants-and-mercury-in-marine-mammals-from-canada-s-eastern-arctic
#15
REVIEW
Tanya M Brown, Robie W Macdonald, Derek C G Muir, Robert J Letcher
Arctic contaminant research in the marine environment has focused on organohalogen compounds and mercury mainly because they are bioaccumulative, persistent and toxic. This review summarizes and discusses the patterns and trends of persistent organic pollutants (POPs) and mercury in ringed seals (Pusa hispida) and polar bears (Ursus maritimus) in the Eastern Canadian Arctic relative to the rest of the Canadian Arctic. The review provides explanations for these trends and looks at the implications of climate-related changes on contaminants in these marine mammals in a region that has been reviewed little...
November 13, 2017: Science of the Total Environment
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
#16
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/29135968/body-burden-of-dichlorodiphenyl-dichloroethene-dde-and-childhood-pulmonary-function
#17
Pallavi P Balte, Joachim Kühr, Herrman Kruse, Wilfried J J Karmaus
Longitudinal studies have shown that early life exposure to dichlorodiphenyl dichloroethene (DDE) can lead to growth reduction during childhood and adolescence. In addition, DDE exposure has been linked to respiratory tract infections and an increased risk of asthma in children. Our aim was to understand the relationships between DDE exposure and pulmonary function in children, and, particularly, whether associations are mediated by the height of the children. We used data from an environmental epidemiologic study conducted in central Germany in children aged 8-10 years...
November 14, 2017: International Journal of Environmental Research and Public Health
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
#18
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/29129429/serum-concentrations-of-organochlorine-compounds-and-predictors-of%C3%A2-exposure-in-children-living-in-agricultural-communities-from-south-eastern-spain
#19
B González-Alzaga, M Lacasaña, A F Hernández, J P Arrebola, I López-Flores, F Artacho-Cordón, J P Bonde, N Olea, C Aguilar-Garduño
BACKGROUND: Information on exposure levels to organochlorine compounds (OCs) in child population is limited, despite their greater vulnerability to the adverse health effects of these chemicals. OBJECTIVE: To determine serum concentrations of 10 OCs (including organochlorine pesticides and polychlorinated biphenyls -PCBs-) in children living in agricultural communities from Almería (South-Eastern Spain), and to identify the main predictors of exposure related to socio-economic characteristics, diet and lifestyle...
November 9, 2017: Environmental Pollution
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
#20
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
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