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Laith Furatian, Madjid Mohseni
The 185 nm wavelength radiation generated by the conventional low pressure mercury lamp forms the basis of an advanced oxidation process (AOP) that does not require chemical addition. The photolysis of water by 185 nm photons generates the hydroxyl radical (OH) used to degrade trace organic contaminants. While AOPs in general suffer decreased efficiency in direct proportion to the concentrations of dissolved organic matter (DOM) and alkalinity (HCO3 - /CO3 2- ), acting as OH scavengers, such solutes impose an additional parasitic effect on the 185 nm AOP as absorbers of photons...
March 1, 2018: Chemosphere
Y Valcárcel, A Valdehíta, E Becerra, M López de Alda, A Gil, M Gorga, M Petrovic, D Barceló, J M Navas
Endocrine disruptors (EDs) are natural or man-made chemicals that can affect the health of organisms by interfering with their normal hormonal functions. Many of these substances can cause their effects at very low doses and, considering the key role played by the endocrine system on development, organisms in early phases of growth (foetal, childhood, puberty) are especially sensitive to the action of EDs. In addition, when combined, they can show additive, antagonistic and synergistic activities. Taking all this into account it is essential to determine the presence of this kind of compounds in drinking water...
February 22, 2018: Chemosphere
A A Markus, P Krystek, P C Tromp, J R Parsons, E W M Roex, P de Voogt, R W P M Laane
We investigated the occurrence of metal-based nanoparticles in a natural system, the river Dommel in the Netherlands. The river itself is well-studied as far as hydrology and water quality is concerned, easily accessible and contains one major wastewater treatment plant discharging onto this river. We sampled water from various locations along the river and collected samples of influent, effluent and sewage sludge from the wastewater treatment plant. The sampling campaign was carried out in June 2015 and these samples were analysed for seven elements using high-resolution inductively coupled plasma mass spectrometry (HR-ICP-MS), ultrafiltration with a sequence of mesh sizes and scanning electron microscopy (SEM)...
March 9, 2018: Science of the Total Environment
Susan Cha, James M Matthias, Mohammad Rahman, Julia A Schillinger, Bruce W Furness, River A Pugsley, Sarah Kidd, Kyle T Bernstein, Thomas A Peterman
BACKGROUND: Health departments prioritize investigations of reported reactive serologic tests based on age, sex, and titer using reactor grids. We wondered how reactor grids are used in different programs, and if administratively closing investigations of low-titer tests could lead to missed primary syphilis cases. METHODS: We obtained a convenience sample of reactor grids from 13 health departments. Interviews with staff from several jurisdictions described the role of grids in surveillance and intervention...
March 9, 2018: Sexually Transmitted Diseases
Gudla Sruthi, M Mansoor Ahammed, Abhipsa R Makwana
Bacterial removal during electrocoagulation (EC) was investigated employing samples from four different water/wastewater sources, namely, greywater, river water, secondary treated sewage and tap water spiked with Escherichia coli. Effects of current density and electrolysis time on the bacterial removal with aluminium electrodes were evaluated. For greywater, river water and secondary treated sewage, total coliform and E. coli removal efficiencies were not significantly different for the tested samples and varied in the range of 2...
March 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Mir Mohammad Ali, Mohammad Lokman Ali, Md Saiful Islam, Md Zillur Rahman
This study was conducted to assess the levels of toxic metals like arsenic (As), chromium (Cr), cadmium (Cd), and lead (Pb) in water and sediments of the Pasur River in Bangladesh. The ranges of Cr, As, Cd, Pb in water were 25.76-77.39, 2.76-16.73, 0.42-2.98 and 12.69-42.67 μg/L and in sediments were 20.67-83.70, 3.15-19.97, 0.39-3.17 and 7.34-55.32 mg/kg. The level of studied metals in water samples exceeded the safe limits of drinking water, indicating that water from this river is not safe for drinking and cooking...
March 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Thibaut Le Guet, Ilham Hsini, Jérôme Labanowski, Leslie Mondamert
Sorption of pharmaceuticals onto sediments is frequently related to organic matter content. Thus, the present work aimed to compare the effect of humic substances (HS) extracted from a river sediment versus Aldrich (HS) on the sorption of selected pharmaceuticals onto this river sediment. The results exhibited no "unique" effect of the presence of HS from the same origin. Thus, the sediment HS increased the sorption of sulfamethoxazole (SMX), diclofenac (DCF), and trimethoprim (TMP), but reduced the sorption of atenolol (ATN)...
March 11, 2018: Environmental Science and Pollution Research International
Jens C Hegg, Jonathan Middleton, Ben Luca Robertson, Brian P Kennedy
The migration of Pacific salmon is an important part of functioning freshwater ecosystems, but as populations have decreased and ecological conditions have changed, so have migration patterns. Understanding how the environment, and human impacts, change salmon migration behavior requires observing migration at small temporal and spatial scales across large geographic areas. Studying these detailed fish movements is particularly important for one threatened population of Chinook salmon in the Snake River of Idaho whose juvenile behavior may be rapidly evolving in response to dams and anthropogenic impacts...
February 2018: Heliyon
Sara Fernandez, Miguel M Sandin, Paul G Beaulieu, Laura Clusa, Jose L Martinez, Alba Ardura, Eva García-Vázquez
Background: Many fish species have been introduced in wild ecosystems around the world to provide food or leisure, deliberately or from farm escapes. Some of those introductions have had large ecological effects. The north American native rainbow trout ( Oncorhynchus mykiss Walbaum, 1792) is one of the most widely farmed fish species in the world. It was first introduced in Spain in the late 19th century for sport fishing (Elvira 1995) and nowadays is used there for both fishing and aquaculture...
2018: PeerJ
A L Collins, Y Zhang, S McMillan, E R Dixon, A Stringfellow, S Bateman, D A Sear
Oxygen demand in river substrates providing important habitats for the early life stages of aquatic ecology, including lithophilous fish, can arise due to the oxidation of sediment-associated organic matter. Oxygen depletion associated with this component of river biogeochemical cycling, will, in part, depend on the sources of such material. A reconnaissance survey was therefore undertaken to assess the relative contributions from bed sediment-associated organic matter sources potentially impacting on the River Axe Special Area of Conservation (SAC), in SW England...
December 2017: River Research and Applications
Nobuyuki Sakai, Shinzo Ota, Yasushi Matsumoto, Rei Kondo, Tetsu Satow, Michiya Kubo, Tomoyuki Tsumoto, Yukiko Enomoto, Taketo Kataoka, Hirotoshi Imamura, Kenichi Todo, Mikito Hayakawa, Hiroshi Yamagami, Kazunori Toyoda, Yasushi Ito, Kenji Sugiu, Yuji Matsumaru, Shinichi Yoshimura
REVIVE SE (REVIVE) is a closed-ended, self-expanding stent retriever used in the RIVER JAPAN study. We present our early experience with REVIVE for revascularization of acute ischemic stroke (AIS) in patients who have failed or are ineligible for intravenous recombinant tissue plasminogen activator treatment. This prospective, single-arm, non-randomized, multicenter registry study followed up patients undergoing mechanical thrombectomy with REVIVE for 90 days. The primary endpoint was a post-procedure Thrombolysis in Cerebral Infarction (TICI) score ≥2a...
March 9, 2018: Neurologia Medico-chirurgica
Shuhuan Zhang, Qiaoqing Xu, Elisa Boscari, Hao Du, Zhitao Qi, Youshen Li, Jun Huang, Jun Di, Huamei Yue, Chuangju Li, Leonardo Congiu, Qiwei Wei
Dabry's sturgeon (Acipenser dabryanus) is mainly distributed in the upper Yangtze River. Although extensively farmed, little information is available on its innate immune system. In this study, we conducted de novo transcriptome assembly of the head kidney to create a comprehensive dataset for A. dabryanus. A total of 51,324,686 high quality reads were obtained from head kidney cDNA library by the Illumina sequencing platform and 131,261 unigenes were determined to contain complete ORFs. The complete coding sequences of g- and c-type lysozymes were identified from unigenes, and designated as ADLysG and ADLysC...
March 8, 2018: Fish & Shellfish Immunology
Evan C Boone, Jeffrey R Laursen, Robert E Colombo, Scott J Meiners, Michael F Romani, Devon B Keeney
Posthodiplostomum minimum utilizes a three-host life cycle with multiple developmental stages. The metacercarial stage, commonly known as 'white grub', infects the visceral organs of many freshwater fishes and was historically considered a host generalist due to its limited morphological variation among a wide range of hosts. In this study, infection data and molecular techniques were used to evaluate the host and tissue specificity of Posthodiplostomum metacercariae in centrarchid fishes. Eleven centrarchid species from three genera were collected from the Illinois portion of the Ohio River drainage and necropsied...
March 12, 2018: Parasitology
Fernanda Pozzan Paim, Kim Valenta, Colin A Chapman, Adriano Pereira Paglia, Helder Lima de Queiroz
Integration between ecology and biogeography provides insights into how niche specialization affects the geographical distribution of species. Given that rivers are not effective barriers to dispersal in three parapatric species of squirrel monkeys (Saimiri vanzolinii, S. cassiquiarensis and S. macrodon) inhabiting floodplain forests of Central Amazonia, we tested whether forest structure and tree diversity may explain species differences in niche specialization and spatial segregation. We sampled 6617 trees of 326 species in three habitats (high várzea, low várzea and chavascal) used by three Saimiri species, and estimated tree species richness in each of them...
March 10, 2018: Primates; Journal of Primatology
Paul Whitehead, Gianbattista Bussi, Mohammed Abed Hossain, Michaela Dolk, Partho Das, Sean Comber, Rebecca Peters, Katrina J Charles, Rob Hope, Sarwar Hossain
River water quality in rapidly urbanising Asian cities threatens to damage the resource base on which human health, economic growth and poverty reduction all depend. Dhaka reflects the challenges and opportunities for balancing these dynamic and complex trade-offs which goals can be achieved through effective policy interventions. There is a serious problem of water pollution in central Dhaka, in the Turag-Tongi-Balu River system in Bangladesh with the river system being one of the most polluted in the world at the moment...
March 8, 2018: Science of the Total Environment
Cássio Resende de Morais, Ana Maria Bonetti, Alexandre Aparecido Mota, Carlos Fernando Campos, Henrique Nazareth Souto, Maria Paula Carvalho Naves, Vanessa Santana Vieira Santos, Edimar Olegário de Campos Júnior, Luiz Alfredo Pavanin, Alexandre Azenha Alves de Rezende, Mário Antônio Spanó, Boscolli Barbosa Pereira
Physico-chemical and toxicological analyses are of fundamental importance to determine water quality. The objectives of the present study were to evaluate the toxicity, mutagenicity and carcinogenicity of samples from the Mumbuca Stream and the Perdizes River, through both SMART and the wts test, respectively, in somatic cells of Drosophila melanogaster and to quantify the amount of heavy metals and other pollutants, which are indicative of environmental quality. Water samples were collected (M1, M2, P1, P2 and MP) and submitted to physico-chemical analysis, calculating the water quality index for each sampling site...
March 3, 2018: Chemosphere
Liyin Qu, Hong Huang, Fang Xia, Yuanyuan Liu, Randy A Dahlgren, Minghua Zhang, Kun Mei
Heavy metal pollution is a major concern in China because of its serious effects on human health. To assess potential human health and ecological risks of heavy metal pollution, concentration data for seven heavy metals (As, Pb, Cd, Cr, Hg, Cu, Zn) from 14 sites spanning the rural-urban interface of the Wen-Rui Tang River watershed in southeast China were collected from 2000 to 2010. The heavy metal pollution index (HPI), hazard index (HI) and carcinogenic risk (CR) metrics were used to assess potential heavy metal risks...
March 8, 2018: Environmental Pollution
Liana Bezerra Dias de Lima, Paula Benevides de Morais, Ricardo Lopes Tortorela de Andrade, Luciana Vieira Mattos, Sandro Estevan Moron
This research aimed to evaluate the ecological risk of xenobiotics associated with agricultural activities by determining metal contents and biomarker responses using tucunaré (Cichla sp.) as a bioindicator. The work was conducted in the southwest region of the state of Tocantins, in the cities of Lagoa da Confusão and Pium. Water samples and specimens of Cichla sp. were collected in the Javaés and Formoso Rivers at three collection points (A, B and C). The concentrations of Cd, Pb, Cu, Cr, Mn, Ni and Zn in water and fish were analyzed...
March 8, 2018: Environmental Pollution
Yanmei Sun, Shiwei Wang, Junfeng Niu
Microbes play important roles during river remediation and the interaction mechanism illustration between microorganisms and sewage is of great significance to improve restoration technology. In this study, micro-nano bubble and submerged resin floating bed composite technology (MBSR) was firstly used to restore two black and stinking urban rivers. After restoration, the water pollution indices such as dissolved oxygen (DO), ammonia nitrogen (NH4 + -N), total phosphorous (TP), chemical oxygen demand (CODCr ), water clarity, and the number of facial coliform were significantly improved...
March 2, 2018: Bioresource Technology
Chieh-Ming Wu, Olorunfemi Adetona, Luke Naeher, Brian J Viner, Tim Jannik, Allan Hepworth, Eric Doman, Teresa Eddy
The aim of this study is to comprehensively investigate radionuclide concentrations in surface soil and un-decayed vegetative litter along four stream systems (i.e. Fourmile Branch, Lower Three Runs, Pen Branch, and Steel Creek) at the Savannah River Site (SRS), Aiken, South Carolina. Soil and litter samples from systematically spaced 12 pairs (contaminated or uncontaminated) of plots along the four streams were analyzed for 16 distinct radionuclide activities. Lower radionuclide concentrations were observed in soil and litter samples collected along Pen Branch compared to the other 3 streams...
March 7, 2018: Journal of Environmental Radioactivity
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