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https://www.readbyqxmd.com/read/29245148/hydrological-and-pollution-processes-in-mining-area-of-fenhe-river-basin-in-china
#1
Yonggang Yang, Zhilong Meng, Wentao Jiao
The hydrological and pollution processes are an important science problem for aquatic ecosystem. In this study, the samples of river water, reservoir water, shallow groundwater, deep groundwater, and precipitation in mining area are collected and analyzed. δD and δ18O are used to identify hydrological process. δ15N-NO3- and δ18O-NO3- are used to identify the sources and pollution process of NO3-. The results show that the various water bodies in Fenhe River Basin are slightly alkaline water. The ions in the water mainly come from rock weathering...
December 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29245133/source-identification-and-ecological-impact-evaluation-of-pahs-in-urban-river-sediments-a-case-study-in-taiwan
#2
Y T Tu, J H Ou, D C W Tsang, C D Dong, C W Chen, C M Kao
The Love River and Ho-Jin River, two major urban rivers in Kaohsiung City, Taiwan, are moderately to heavily polluted because different types of improperly treated wastewaters are discharged into the rivers. In this study, sediment and river water samples were collected from two rivers to investigate the river water quality and accumulation of polycyclic aromatic hydrocarbons (PAHs) in sediments. The spatial distribution, composition, and source appointment of PAHs of the sediments were examined. The impacts of PAHs on ecological system were assessed using toxic equivalence quotient (TEQ) of potentially carcinogenic PAHs (TEQcarc) and sediment quality guidelines...
December 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/29244955/dose-and-diet-sources-of-arsenic-intake-in-mouse-in-utero-exposure-scenarios
#3
Manuela Murko, Brittany Elek, Miroslav Styblo, David James Thomas, Kevin A Francesconi
In humans, early life exposure to inorganic arsenic is associated with adverse health effects. Inorganic arsenic in utero or in early postnatal life also produces adverse health effects in offspring of pregnant mice that consumed drinking water containing low part per billion levels of inorganic arsenic. Because aggregate exposure of pregnant mice to inorganic arsenic from both drinking water and food has not been fully evaluated in experimental studies, quantifying arsenic exposure of the developing mouse is problematic...
December 15, 2017: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/29244775/spatial-temporal-and-dietary-variables-associated-with-elevated-mercury-exposure-in-peruvian-riverine-communities-upstream-and-downstream-of-artisanal-and-small-scale-gold-mining
#4
Lauren Wyatt, Ernesto J Ortiz, Beth Feingold, Axel Berky, Sarah Diringer, Ana Maria Morales, Elvis Rojas Jurado, Heileen Hsu-Kim, William Pan
Artisanal and small-scale gold mining (ASGM) is a primary contributor to global mercury and its rapid expansion raises concern for human exposure. Non-occupational exposure risks are presumed to be strongly tied to environmental contamination; however, the relationship between environmental and human mercury exposure, how exposure has changed over time, and risk factors beyond fish consumption are not well understood in ASGM settings. In Peruvian riverine communities (n = 12), where ASGM has increased 4-6 fold over the past decade, we provide a large-scale assessment of the connection between environmental and human mercury exposure by comparing total mercury contents in human hair (2-cm segment, n = 231) to locally caught fish tissue, analyzing temporal exposure in women of child bearing age (WCBA, 15-49 years, n = 46) over one year, and evaluating general mercury exposure risks including fish and non-fish dietary items through household surveys and linear mixed models...
December 15, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29244174/the-attractiveness-of-the-gravid-aedes-trap-to-dengue-vectors-in-fiji
#5
James F Harwood, Vineshwaran Rama, John M Hash, Scott W Gordon
The Gravid Aedes Trap (GAT) is a passive trap that relies on visual and olfactory cues to lure and capture gravid mosquitoes. The GAT was designed as a dengue vector surveillance tool for use in conditions where power sources are not readily available. Experiments were conducted over a 10-d period in Fiji to determine which species of mosquitoes the GAT would collect, how different infusion types affect the attractiveness of the trap, how long each infusion type took to begin attracting mosquitoes, and how long the infusion was attractive to container breeding Aedes mosquitoes...
December 13, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29243751/the-effect-of-surfactants-on-electrohydrodynamic-jet-printing-and-the-performance-of-organic-field-effect-transistors
#6
Xinlin Li, Yong Jin Jeong, Jaeyoung Jang, Sooman Lim, Se Hyun Kim
In this article, we report on the direct writing of multi-walled carbon nanotube (MWCNT) composite inks based on three different surfactants via the electrohydrodynamic (EHD) jet printing technique. All three surfactants, including two types of polymeric surfactants and an ionic surfactant, successfully dispersed the MWCNTs in the ink medium. Although the MWCNT composite with the ionic surfactant could not be printed by the EHD process, the MWCNT composites with polymeric surfactants could be successfully printed using this technique...
December 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29243251/factors-affecting-estimates-of-size-at-age-and-growth-in-grey-triggerfish-balistes-capriscus-from-the-northern-gulf-of-mexico
#7
R J Allman, W F Patterson, C L Fioramonti, A E Pacicco
Growth zones in dorsal spines of grey triggerfish Balistes capriscus from the northern Gulf of Mexico were utilized to estimate growth and examine factors that may affect estimates of size at age. Age was estimated from dorsal-spine sections of 4687 individuals sampled from U.S. waters during 2003-2013, including both fishery-independent (n = 1312) and fishery-dependent (n = 3375) samples. Ninety-six per cent (n = 4498) of these sections were deemed suitable for ageing; average per cent error between two independent readers was 10·8%...
December 15, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/29243147/seasonal-variations-in-size-distribution-water-soluble-ions-and-carbon-content-of-size-segregated-aerosols-over-new-delhi
#8
Pawan Kumar, Sushil Kumar, Sudesh Yadav
Size distribution, water-soluble inorganic ions (WSII), and organic carbon (OC) and elemental carbon (EC) in size-segregated aerosols were investigated during a year-long sampling in 2010 over New Delhi. Among different size fractions of PM10, PM0.95 was the dominant fraction (45%) followed by PM3-7.2 (20%), PM7.2-10 (15%), PM0.95-1.5 (10%), and PM1.5-3 (10%). All size fractions exceeded the ambient air quality standards of India for PM2.5. Annual average mass size distributions of ions were specific to size and ion(s); Ca2+, Mg2+, K+, NO3-, and Cl- followed bimodal distribution while SO42- and NH4+ ions showed one mode in PM0...
December 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29241842/functional-impact-of-congenital-hand-differences-early-results-from-the-congenital-upper-limb-differences-could-registry
#9
Donald S Bae, Maria F Canizares, Patricia E Miller, Peter M Waters, Charles A Goldfarb
PURPOSE: To characterize the functional, emotional, and social impact of congenital upper limb differences on affected children and families before treatment, using validated functional outcome instruments. METHODS: From June 2014 to March 2016, 586 children with congenital upper limb differences from 2 pediatric hospitals were enrolled in the Congenital Upper Limb Differences registry. Demographic, clinical, and radiographic data were collected, and diagnoses categorized according to the Oberg-Manske-Tonkin classification...
December 11, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/29241674/ethnomedicinal-plant-diversity-in-thailand
#10
Methee Phumthum, Kamonnate Srithi, Angkhana Inta, Auemporn Junsongduang, Kornkanok Tangjitman, Wittaya Pongamornkul, Chusie Trisonthi, Henrik Balslev
ETHNOPHARMACOLOGICAL RELEVANCE: Plants have provided medicine to humans for thousands of years, and in most parts of the world people still use traditional plant-derived medicine. Knowledge related to traditional use provides an important alternative to unavailable or expensive western medicine in many rural communities. At the same time, ethnomedicinal discoveries are valuable for the development of modern medicine. Unfortunately, globalization and urbanization causes the disappearance of much traditional medicinal plant knowledge...
December 11, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29241298/etiology-of-salinity-and-water-origin-the-main-dilemma-of-badab-sourt-a-unique-travertine-spring
#11
Rahim Bagheri, Hadi Jafari, Fatemeh Bagheri
Badab Sourt travertine-depositing springs in the north of Iran, naturally create a unique surreal landscape containing a range of stepped travertine terraces, similarly found only in a few other places on earth. This site comprises of three travertine saline springs with different values of salinity and discharge (SP1 , SP2 , and SP3 ) and one non-travertine fresh karstic spring (SP4 ) within a distance of about 300 m. The etiology behind this salinity and the water origin are the main research's dilemma that were investigated using geological, hydrochemical, and stable isotopic techniques...
December 14, 2017: Ground Water
https://www.readbyqxmd.com/read/29241191/evaluation-of-behavioral-and-susceptibility-patterns-in-premenopausal-women-with-recurrent-urinary-tract-infections-a-case-control-study
#12
Saddam Al Demour, Mera A Ababneh
Recurrent urinary tract infections (UTI) are a major source of morbidity and healthcare costs. Risk factors associated with recurrence rates in premenopausal women can be attributed to patient lifestyle behavior. The aim of this study was to assess hygienic risk factors, determine pathogen distribution, and susceptibility patterns in premenopausal women with recurrent UTI. This was case-control study in which a face-to-face interview was conducted to obtain information from premenopausal women with recurrent UTI...
December 14, 2017: Urologia Internationalis
https://www.readbyqxmd.com/read/29241130/calculation-of-thallium-s-toxicity-coefficient-in-the-evaluation-of-potential-ecological-risk-index-a-case-study
#13
Yongxia Liu, Qian Wang, Wen Zhuang, Yanli Yuan, Yani Yuan, Keqin Jiao, Mantang Wang, Qing Chen
As a common pollutive metal element, Tl is very biotoxic. The potential ecological risk index (RI) proposed by Håkanson is one of the commonest methods for evaluation of ecological risk of a metal in sedimentary environment of a water body. According to the calculation principle proposed by Håkanson, the toxicity coefficient of Tl was calculated, and determined as 10 in this paper. In addition, the environmental risk of Tl in the surface sediment of the Beijing-Hangzhou Grand Canal (Zaozhuang Section) was evaluated by RI method, enrichment factor method, etc...
December 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/29240421/photochemistry-of-fe-h2o-adducts-in-argon-matrices-a-combined-experimental-and-theoretical-study-in-the-mid-ir-and-uv-visible-regions
#14
Vincent Deguin, Joëlle Mascetti, Aude Simon, Nadia Ben Amor, Christian Aupetit, Sandra Latournerie, Jennifer Anna Noble
The photochemistry of Fe:H2O adducts is of interest in fields as diverse as catalysis and astrochemistry. Industrially, iron can be used as a catalyst to convert H2O to H2, while in the interstellar medium it may be an important component of dust grains, influencing the chemistry on their icy surfaces. This study consisted of the deposition and spectral characterisation of binary systems of atomic iron with H2O in cryogenic argon matrices. In this way, we were able to obtain information about the interaction of the two species; we observed the formation of adducts of iron monomers and dimers with water molecules in the mid-IR and UV-visible spectral domains...
December 14, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29240414/trace-element-removal-in-distributed-drinking-water-treatment-systems-by-cathodic-h2o2-production-and-uv-photolysis
#15
James M Barazesh, Carsten Prasse, Jannis Wenk, Stephanie Berg, Christina K Remucal, David L Sedlak
As water scarcity intensifies, point-of-use and point-of-entry treatment may provide a means of exploiting locally available water resources that are currently considered to be unsafe for human consumption. Among the different classes of drinking water contaminants, toxic trace elements (e.g., arsenic and lead) pose substantial operational challenges for distributed drinking water treatment systems. Removal of toxic trace elements via adsorption onto iron oxides is an inexpensive and robust treatment method; however, the presence of metal-complexing ligands associated with natural organic matter (NOM) often prevents the formation of iron precipitates at the relatively low concentrations of dissolved iron typically present in natural water sources, thereby requiring the addition of iron which complicates the treatment process and results in a need to dispose of relatively large amounts of accumulated solids...
December 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29240406/radical-deuteration-with-d2o-catalysis-and-mechanistic-insights
#16
Valentin Soulard, Giorgio Villa, Denis Patrick Vollmar, Philippe Renaud
Selective incorporation of deuterium atoms into molecules is of high interest for labeling purposes and for optimizing properties of drug candidates. A mild and environmentally benign method for the deuteration of alkyl iodides via radical pathway using D2O as source of deuterium has been developed. The reaction is initiated and mediated by triethylborane in the presence of dodecanethiol as a catalyst. This method is compatible with a wide range of functional groups and provides the monodeuterated products in good yields and high level of deuterium incorporation...
December 14, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29240233/blue-honeysuckle-lonicera-caerulea-subsp-edulis-turcz-ex-herder-hult%C3%A3-n-berries-and-changes-in-their-ingredients-across-different-locations
#17
Mateja Senica, Martina Bavec, Franci Stampar, Maja Mikulic-Petkovsek
BACKGROUND: Interest in organic blue honeysuckle berries has increased in recent years. They are rich in various health promoting compounds, which are sensitive to different environmental factors and are modified during the growing season. RESULTS: Honeysuckle berries from different locations significantly differed in contents of primary and secondary metabolites. The location Ogulin, with the highest altitude and, consequently, high UV-radiation, had the highest phenolics content (259...
December 14, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29239176/development-of-betalain-producing-callus-lines-from-colored-quinoa-varieties-chenopodium-quinoa-willd
#18
Paula Henarejos-Escudero, Berenice Guadarrama-Flores, M Alejandra Guerrero-Rubio, Luz Rayda Gómez-Pando, Francisco García-Carmona, Fernando Gandía-Herrero
Betalains are water soluble plant pigments of hydrophilic nature with promising bioactive potential. Among the scarce edible sources of betalains is the grain crop quinoa (Chenopodim quinoa Willd), with violet, red, and yellow grains being colored by these pigments. In this work callus cultures have been developed from differently colored plant varieties. Stable callus lines exhibited color and pigment production when maintained on Murashige and Skoog medium supplemented with the plant growth regulators 6-benzylaminopurine (8...
December 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29238843/management-practices-used-in-agricultural-drainage-ditches-to-reduce-gulf-of-mexico-hypoxia
#19
REVIEW
Derek R Faust, Robert Kröger, Matthew T Moore, Scott A Rush
Agricultural non-point sources of nutrients and sediments have caused eutrophication and other water quality issues in aquatic and marine ecosystems, such as the annual occurrence of hypoxia in the Gulf of Mexico. Management practices have been implemented adjacent to and in agricultural drainage ditches to promote their wetland characteristics and functions, including reduction of nitrogen, phosphorus, and sediment losses downstream. This review: (1) summarized studies examining changes in nutrient and total suspended solid concentrations and loads associated with management practices in drainage ditches (i...
December 13, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29238685/prevalence-of-goitre-in-raichur-district-karnataka-a-descriptive-study
#20
Vithal D Udagatti, Rajendran Dinesh Kumar
This prevalence study was exclusively for the goitre detection in individuals who has no prior awareness of thyroid disorder and also those patients giving history of signs and symptoms of such conditions. Subjects underwent investigations for (T3, T4, TSH and FNAC) to analyze status and type of Goitre. Of the first 30 cases, only 8 cases were investigated and later on personal  interest  for confirmation of goitre disorder prevalence additional 70 cases were assessed of which 51 cases were investigated...
December 2017: Indian Journal of Otolaryngology and Head and Neck Surgery
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