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https://www.readbyqxmd.com/read/28822206/prevalence-and-molecular-characterisation-of-schistosoma-haematobium-among-primary-school-children-in-kebbi-state-nigeria
#1
Shuaibu Umar, Saadatu Haruna Shinkafi, Shuaibu Abdullahi Hudu, Vasanthakumari Neela, Kumar Suresh, Syafinaz Amin Nordin, Osman Malina
Schistosomiasis is the major source of morbidity in Sub-Saharan Africa and Asia. It is estimated that 207 million people are infected, of which 97% are in Africa. The aim of this study was the determining of prevalence as well as the phylogeny of S. haematobium among school children in Argungu Emirate, Kebbi State Nigeria. A total of 325 urine samples was collected from school children between 7 to 14 years. S. heamatobium eggs was examined under dissecting microscope and DNA was extracted from urine sample and COX1 gene was amplified by nested PCR...
2017: Annals of Parasitology
https://www.readbyqxmd.com/read/28822183/-application-of-dosc-combined-with-sbc-in-batches-transfer-of-nir-quantitative-model
#2
Yi-Fei Jia, Ying-Ying Zhang, Bing Xu, An-Dong Wang, Xue-Yan Zhan
Near infrared model established under a certain condition can be applied to the new samples status, environmental conditions or instrument status through the model transfer. Spectral background correction and model update are two types of data process methods of NIR quantitative model transfer, and orthogonal signal regression (OSR) is a method based on spectra background correction, in which virtual standard spectra is used to fit a linear relation between master batches spectra and slave batches spectra, and map the slave batches spectra to the master batch spectra to realize the transfer of near infrared quantitative model...
June 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28822158/-fast-identification-of-constituents-of-lagotis-brevituba-by-using-uplc-q-tof-ms-ms-method
#3
Jing Xie, Li Zhang, Jin-Xiang Zeng, Min Li, Juan Wang, Xiong-Xiong Xie, Guo-Yue Zhong, Guang-Ming Luo, Jin-Bin Yuan, Jian Liang
The chemical constituents of Lagotis brevituba were rapidly determined and analyzed by using ultra performance liquid chromatography tandem quadrupole time of flight mass spectrometry (UPLC-Q-TOF-MS/MS) method, providing material basis for the clinical application of L. brevituba. The separation was performed on UPLC YMC-Triart C₁₈ (2.1 mm×100 mm, 1.9 μm) column, with acetonitrile-water containing 0.2% formic acid as mobile phase for gradient elution. The flow rate was 0.4 mL•min-1 gradient elution and column temperature was 40 ℃, the injection volume was 2 μL...
June 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28822043/industrial-pollution-and-the-management-of-river-water-quality-a-model-of-kelani-river-sri-lanka
#4
Asha Gunawardena, E M S Wijeratne, Ben White, Atakelty Hailu, Ram Pandit
Water quality of the Kelani River has become a critical issue in Sri Lanka due to the high cost of maintaining drinking water standards and the market and non-market costs of deteriorating river ecosystem services. By integrating a catchment model with a river model of water quality, we developed a method to estimate the effect of pollution sources on ambient water quality. Using integrated model simulations, we estimate (1) the relative contribution from point (industrial and domestic) and non-point sources (river catchment) to river water quality and (2) pollutant transfer coefficients for zones along the lower section of the river...
August 19, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28821062/cell-wall-polysaccharides-from-pulp-and-peel-of-cubiu-a-pectin-rich-fruit
#5
Cristiane Colodel, Rosane Maria das Graças Bagatin, Talita Maria Tavares, Carmen Lúcia de Oliveira Petkowicz
To investigate the polysaccharides of cubiu (Solanum sessiliflorum D.) fruits, pulp and peel were subjected to sequential extractions using different solvents, giving rise to pectins heterogeneous with respect to their structural characteristics, xylan, arabinogalactoxyloglucans and glucomannans. Chemical, physicochemical and spectroscopic analyses were used to characterize the polysaccharides obtained. Pectins with uronic acid content of commercial grade were obtained from the peel of cubiu fruits using water (25°C and 100°C) and EDTA and from its pulp using water (100°C)...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821002/modeling-the-fate-and-transport-of-17%C3%AE-estradiol-in-the-south-river-watershed-in-virginia
#6
Xiaomin Zhao, Wu-Seng Lung
Hormones excreted by livestock metabolisms often enter surface water through feces and urine and can potentially cause adverse impacts to aquatic biota. This study involved a modeling analysis of 17β-estradiol (E2), a prevalent estrogen, in the South River watershed located in Augusta County, Virginia from 2013 to 2015. Cattle manure, poultry litter, biosolids, septic systems, and wastewater treatment plants (WWTPs) were considered as sources of E2 in this study. The EPA's BASINS modeling framework was configured to track the fate and transport of E2...
August 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/28820992/bioavailability-of-dissolved-organic-nitrogen-don-in-wastewaters-from-animal-feedlots-and-storage-lagoons
#7
Jingyi Sun, Eakalak Khan, Senay Simsek, Jae-Bom Ohm, Halis Simsek
Dissolved organic nitrogen (DON) from animal wastes can contribute to pollution of surface waters. Bioavailable DON (ABDON) is a portion of DON utilized by algae with or without bacteria. This study determined DON and ABDON levels in animal wastewater collected from two different sources: an animal feedlot wastewater storage tank and a sheep wastewater storage lagoon. Inocula for the ABDON bioassays were comprised of individual species and several combinations involving two algae (Chlamydomonas reinhardtii and Chlorella vulgaris) and a mixed liquor suspended solids (MLSS) bacterial culture...
August 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/28820729/head-phantoms-for-electroencephalography-and-transcranial-electric-stimulation-a-skull-material-study
#8
Alexander Hunold, Daniel Strohmeier, Patrique Fiedler, Jens Haueisen
Physical head phantoms allow the assessment of source reconstruction procedures in electroencephalography and electrical stimulation profiles during transcranial electric stimulation. Volume conduction in the head is strongly influenced by the skull, which represents the main conductivity barrier. Realistic modeling of its characteristics is thus important for phantom development. In the present study, we proposed plastic clay as a material for modeling the skull in phantoms. We analyzed five clay types varying in granularity and fractions of fire clay, each with firing temperatures from 550°C to 950°C...
August 18, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28820718/water-sanitation-and-hygiene-in-rural-health-care-facilities-a-cross-sectional-study-in-ethiopia-kenya-mozambique-rwanda-uganda-and-zambia
#9
Amy Guo, J Michael Bowling, Jamie Bartram, Georgia Kayser
Safe and sufficient water, sanitation, and hygiene (WaSH) prevent the spread of disease in health-care facilities (HCFs). Little research has been conducted on WaSH in HCF in sub-Saharan Africa. We carried out a cross-sectional study of WaSH in 1,318 randomly selected rural HCF (hospitals, health centers, health posts, and clinics) in regions throughout Ethiopia, Kenya, Mozambique, Rwanda, Uganda, and Zambia. Methods included questionnaires with head doctors and nurses to document WaSH access, continuity, quality, quantity and reliability, and analysis of drinking water samples for Escherichia coli...
July 31, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28820591/predicting-relative-stability-of-conformers-in-solution-with-cosmo-rs
#10
Astrid Pung, Ivo Leito
The ability of the COSMO-RS method to predict the relative stability of different conformers of the same species in solution was evaluated by comparing computational results with experimental conformer data for 101 molecules from 20 literature sources. The solvents CDCl3, CD2Cl2, benzene, toluene, ethyl ether, tetrahydrofuran, acetone, dimethylformamide, DMSO (and DMSO-d6), water and ethanol were used (dictated by the solvents used in the literature). In the case of 16 molecules the quantitative conformer abundances were also available and were compared with the data from computations...
August 18, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28820576/angiostrongyliasis-rat-lungworm-disease-viewpoints-from-hawai-i-island
#11
Kathleen Howe, Susan I Jarvi
Hawai'i, particularly east Hawai'i Island, is the epicenter for angiostrongyliasis in the United States. Case numbers have been increasing and appear to parallel the introduction and spread of the semislug (Parmarion martensi) to east Hawai'i. The infective larvae in rainwater catchment as a source for household and agricultural water may also play a role. The spread of Angiostrongylus cantonensis as well as the potential introduction of the semislug P. martensi should be a concern to the mainland United States...
August 18, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28820215/how-exfoliated-graphene-oxide-nanosheets-organize-at-the-water-interface-evidence-for-a-spontaneous-bilayer-self-assembly
#12
Nathalie Bonatout, François Muller, Philippe Fontaine, Ignacio Gascon, Oleg Konovalov, Michel Goldmann
In this study, we have characterized graphene oxide films formed at the air-water interface by X-ray reflectivity and grazing incidence X-ray diffraction using synchrotron sources. Surprisingly, the results of both measurements show that at non zero surface pressures, the film is organized as a bilayer of sheets interfaced between air and water with water molecule bridges. Such a spontaneous bilayer structure and its evolution with respect to the surface pressure has been observed for the first time. These results should allow precise control of the density of sheets deposited on the substrate when these films are transferred through the Langmuir Blodgett or Schaefer procedures...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819754/development-of-the-hybrid-cells-in-series-model-to-simulate-ammonia-nutrient-pollutant-transport-along-the-umgeni-river
#13
Kayode O Olowe, Muthukrishnavellaisamy Kumarasamy
Discharge of organic waste results in high nutrient pollution of the water bodies which is a major menace to the environment. A high quantity of nutrients such as ammonia causes a reduction in the dissolved oxygen level and induces algal growth in the water bodies. Water quality models have been the tools to evaluate the rate at which streams can disperse the pollutants they receive. Many water quality models are flawed either because of their inadequacy to completely simulate the advection component of the pollutant transport, or because of the limited application of the models, due to inaccurate estimation of model parameters...
August 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28819724/hydrogeochemistry-and-water-quality-of-the-kordkandi-duzduzan-plain-nw-iran-application-of-multivariate-statistical-analysis-and-pos-index
#14
Shahla Soltani, Asghar Asghari Moghaddam, Rahim Barzegar, Naeimeh Kazemian, Evangelos Tziritis
Kordkandi-Duzduzan plain is one of the fertile plains of East Azarbaijan Province, NW of Iran. Groundwater is an important resource for drinking and agricultural purposes due to the lack of surface water resources in the region. The main objectives of the present study are to identify the hydrogeochemical processes and the potential sources of major, minor, and trace metals and metalloids such as Cr, Mn, Cd, Fe, Al, and As by using joint hydrogeochemical techniques and multivariate statistical analysis and to evaluate groundwater quality deterioration with the use of PoS environmental index...
August 18, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28819714/utilization-of-waste-bittern-from-saltern-as-a-source-for-magnesium-and-an-absorbent-for-carbon-dioxide-capture
#15
Choon-Ki Na, Hyunju Park, Eun Hea Jho
During solar salt production, large quantities of bittern, a liquid by-product containing high inorganic substance concentrations, are produced. The purpose of this research was to examine the utilization of waste bittern generated from salterns as a source for Mg production and as an absorbent for carbon dioxide (CO2) capture. The study was conducted in a sequential two-step process. At NaOH/Mg molar ratios of 2.70-2.75 and pH 9.5-10.0, > 99% Mg precipitation from the bittern was achieved. After washing with water, 100-120 g/L of precipitate containing 94% Mg(OH)2 was recovered from the bittern...
August 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28819230/genomic-signatures-of-local-adaptation-reveal-source-sink-dynamics-in-a-high-gene-flow-fish-species
#16
Katherine Cure, Luke Thomas, Jean-Paul A Hobbs, David V Fairclough, W Jason Kennington
Understanding source-sink dynamics is important for conservation management, particularly when climatic events alter species' distributions. Following a 2011 'marine heatwave' in Western Australia, we observed high recruitment of the endemic fisheries target species Choerodon rubescens, towards the cooler (southern) end of its distribution. Here, we use a genome wide set of 14 559 single-nucleotide polymorphisms (SNPs) to identify the likely source population for this recruitment event. Most loci (76%) showed low genetic divergence across the species' range, indicating high levels of gene flow and confirming previous findings using neutral microsatellite markers...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819153/giant-onsite-electronic-entropy-enhances-the-performance-of-ceria-for-water-splitting
#17
S Shahab Naghavi, Antoine A Emery, Heine A Hansen, Fei Zhou, Vidvuds Ozolins, Chris Wolverton
Previous studies have shown that a large solid-state entropy of reduction increases the thermodynamic efficiency of metal oxides, such as ceria, for two-step thermochemical water splitting cycles. In this context, the configurational entropy arising from oxygen off-stoichiometry in the oxide, has been the focus of most previous work. Here we report a different source of entropy, the onsite electronic configurational entropy, arising from coupling between orbital and spin angular momenta in lanthanide f orbitals...
August 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28819124/long-term-2001-2013-observations-of-water-soluble-dicarboxylic-acids-and-related-compounds-over-the-western-north-pacific-trends-seasonality-and-source-apportionment
#18
Suresh K R Boreddy, Kimitaka Kawamura, Eri Tachibana
To better understand the impact of East Asian pollutants on the molecular composition of marine organic aerosols, we conducted long-term (2001-2013) observations of water-soluble dicarboxylic acids and related compounds in total suspended particulate samples collected at Chichijima Island in the western North Pacific (WNP). Seasonal variations of all the diacids and related compounds showed maxima in winter and spring and minima in summer, except for azelaic acid (C9), which maximized in summer to autumn. The overall annual concentrations of the total diacids, ω-oxoacids and α-dicarbonyls showed an increase during 2001-2013...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819112/tracing-nitrate-sources-with-dual-isotopes-and-long-term-monitoring-of-nitrogen-species-in-the-yellow-river-china
#19
Fu-Jun Yue, Si-Liang Li, Cong-Qiang Liu, Zhi-Qi Zhao, Hu Ding
A heavy load of nitrogenous compounds reflects nutrient loss and influences water quality in large rivers. Nitrogenous concentrations and dual isotopes of nitrate were measured to ascertain the spatial and temporal distributions of nitrate transformation in the Yellow River, the second-longest river in China. Assessment of the long-term record indicates that [NO3(-)-N] has increased by two-fold over the past three decades. Weekly observation of ammonium over a twelve-year period revealed high concentrations and suggests impairment of water quality, particularly since 2011...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818815/mercury-concentrations-in-china-s-coastal-waters-and-implications-for-fish-consumption-by-vulnerable-populations
#20
Yindong Tong, Mengzhu Wang, Xiaoge Bu, Xin Guo, Yan Lin, Huiming Lin, Jing Li, Wei Zhang, Xuejun Wang
We assessed mercury (Hg) pollution in China's coastal waters, including the Bohai Sea, the Yellow Sea, the East China Sea and the South China Sea, based on a nationwide dataset from 301 sampling sites. A methylmercury (MeHg) intake model for humans based on the marine food chain and human fish consumption was established to determine the linkage between water pollutants and the pollutant intake by humans. The predicted MeHg concentration in fish from the Bohai Sea was the highest among the four seas included in the study...
August 14, 2017: Environmental Pollution
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