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https://www.readbyqxmd.com/read/28636272/development-of-biotic-ligand-model-based-freshwater-aquatic-life-criteria-for-lead-following-us-environmental-protection-agency-guidelines
#1
David K DeForest, Robert C Santore, Adam C Ryan, Brian G Church, M Jasim Chowdhury, Kevin V Brix
The US Environmental Protection Agency's (USEPA's) current ambient water quality criteria (AWQC) for lead (Pb) in freshwater were developed in 1984. The criteria are adjusted for hardness, but more recent studies have demonstrated that other parameters, especially dissolved organic carbon (DOC) and pH, have a much stronger influence on Pb bioavailability. These recent studies have been used to support development of a biotic ligand model (BLM) for Pb in freshwater, such that acute and chronic Pb toxicity can be predicted over a wide range of water chemistry conditions...
June 21, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28636253/estimation-of-vanadium-water-quality-benchmarks-for-the-protection-of-aquatic-life-with-relevance-to-the-athabasca-oil-sands-region-using-species-sensitivity-distributions
#2
Stephanie Schiffer, Karsten Liber
Elevated vanadium (V) concentrations in oil sands coke, which is produced and stored on the site of some major Athabasca Oil Sands companies, could pose a risk to aquatic ecosystems in northern Alberta, Canada, depending on its future storage and utilization. In the present study, V toxicity was determined in reconstituted Athabasca River water to various freshwater organisms, including 2 midge species (Chironomus dilutus and Chironomus riparius; 4-d and 30- to 40-d exposures) and 2 freshwater fish species (Oncorhynchus mykiss and Pimephales promelas; 4-d and 28-d exposures) to facilitate estimation of water quality benchmarks...
June 21, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28636204/aerobic-exercise-training-for-adults-with-fibromyalgia
#3
REVIEW
Julia Bidonde, Angela J Busch, Candice L Schachter, Tom J Overend, Soo Y Kim, Suelen M Góes, Catherine Boden, Heather Ja Foulds
BACKGROUND: Exercise training is commonly recommended for individuals with fibromyalgia. This review is one of a series of reviews about exercise training for people with fibromyalgia that will replace the "Exercise for treating fibromyalgia syndrome" review first published in 2002. OBJECTIVES: • To evaluate the benefits and harms of aerobic exercise training for adults with fibromyalgia• To assess the following specific comparisons ० Aerobic versus control conditions (eg, treatment as usual, wait list control, physical activity as usual) ० Aerobic versus aerobic interventions (eg, running vs brisk walking) ० Aerobic versus non-exercise interventions (eg, medications, education) We did not assess specific comparisons involving aerobic exercise versus other exercise interventions (eg, resistance exercise, aquatic exercise, flexibility exercise, mixed exercise)...
June 21, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28636199/widespread-occurrence-and-potential-for-biodegradation-of-bioactive-contaminants-in-congaree-national-park-usa
#4
Paul M Bradley, William A Battaglin, Jimmy M Clark, Frank Henning, Michelle L Hladik, Luke R Iwanowicz, Celeste A Journey, Jeffrey W Riley, Kristin M Romanok
Organic contaminants with designed molecular bioactivity, such as pesticides and pharmaceuticals, originate from human and agricultural sources, occur frequently in surface waters, and threaten the structure and function of aquatic and terrestrial ecosystems. Congaree National Park in South Carolina (USA) is a vulnerable park unit due to its location downstream of multiple urban and agricultural contaminant sources and its hydrologic setting, being composed almost entirely of floodplain and aquatic environments...
June 21, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28636110/cumulative-toxicity-of-neonicotinoid-insecticide-mixtures-to-chironomus-dilutus-under-acute-exposure-scenarios
#5
Erin M Maloney, Christy A Morrissey, John V Headley, Kerry M Peru, Karsten Liber
Extensive agricultural use of neonicotinoid insecticide products has resulted in the presence of neonicotinoid mixtures in surface waters worldwide. Although many aquatic insect species are known to be sensitive to neonicotinoids, the impact of neonicotinoid mixtures is poorly understood. In the present study, the cumulative toxicity of binary and ternary mixtures of select neonicotinoids (imidacloprid, clothianidin, and thiamethoxam) was characterized under acute (96-h) exposure scenarios using the larval midge Chironomus dilutus as a representative aquatic insect species...
June 21, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28634805/comparative-prevalence-of-escherichia-coli-carrying-virulence-genes-and-class-1-and-2-integrons-in-sub-tropical-and-cool-temperate-freshwater
#6
Jatinder P S Sidhu, Paul Jagals, Amy Smith, Simon Toze
Aquatic environments are now recognized secondary habitat of potentially pathogenic Escherichia coli. In this study, PCR-based analyses were used to determine the phylogenetic composition and frequency of occurrence of eight clinically significant virulence genes (VGs) in E. coli isolates from sub-tropical Brisbane and cool temperate Tasmania freshwater in Australia. In Brisbane, non-commensal E. coli isolates belonging to the B2 and D phylogenetic group were dominant (72%). A significantly higher number (P < 0...
June 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28634791/erratum-to-toxic-potential-of-the-emerging-contaminant-nicotine-to-the-aquatic-ecosystem
#7
Ana Lourdes Oropesa, António Miguel Floro, Patrícia Palma
No abstract text is available yet for this article.
June 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28634653/assessing-the-combined-toxicity-of-bmaa-and-its-isomers-2-4-dab-and-aeg-in-vitro-using-human-neuroblastoma-cells
#8
Brendan J Main, Kenneth J Rodgers
The non-protein amino acid (NPAA) ß-methylamino-L-alanine (BMAA) is produced by a diverse range of cyanobacteria, diatoms and dinoflagellates, and is present in both aquatic and terrestrial ecosystems globally. Exposure to BMAA has been implicated in the development of neurodegenerative diseases including amyotrophic lateral sclerosis (ALS), Alzheimer's disease (AD) and Parkinson's disease (PD). BMAA is often found in nature along with its structural isomers 2,4-diaminobutyric acid (2,4-DAB) and aminoethylglycine (AEG); however, the toxicity of these NPAAs in combination has not been examined...
June 20, 2017: Neurotoxicity Research
https://www.readbyqxmd.com/read/28634476/changes-in-n-p-supply-ratios-affect-the-ecological-stoichiometry-of-a-toxic-cyanobacterium-and-its-fungal-parasite
#9
Thijs Frenken, Joren Wierenga, Alena S Gsell, Ellen van Donk, Thomas Rohrlack, Dedmer B Van de Waal
Human activities have dramatically altered nutrient fluxes from the landscape into receiving waters. As a result, not only the concentration of nutrients in surface waters has increased, but also their elemental ratios have changed. Such shifts in resource supply ratios will alter autotroph stoichiometry, which may in turn have consequences for higher trophic levels, including parasites. Here, we hypothesize that parasite elemental composition will follow changes in the stoichiometry of its host, and that its reproductive success will decrease with host nutrient limitation...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28634330/increase-in-predation-risk-and-trophic-level-induced-by-nocturnal-visits-of-piscivorous-fishes-in-a-temperate-seagrass-bed
#10
Jun Shoji, Hiromichi Mitamura, Kotaro Ichikawa, Hikari Kinoshita, Nobuaki Arai
The majority of surveys on food webs of aquatic ecosystems have been conducted during the day owning to difficulties in sampling animals at night. In this study, to examine diurnal changes in predator-prey interactions in a temperate seagrass Zostera marina bed, a quantitative day/night survey of fish, the dominant animal community, coupled with acoustic telemetry of their predators, was conducted. The number of species, abundance, and biomass of piscivorous predators and mean trophic level during the night were significantly higher than those in the day in all seasons...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28634115/delineating-the-roles-of-cellular-and-innate-antiviral-immune-parameters-mediating-ranavirus-susceptibility-using-rainbow-trout-cell-lines
#11
Graeme J Lisser, Nguyen T K Vo, Stephanie J DeWitte-Orr
Frog virus 3 is the type species of the Ranavirus genus and the causative agent of massive mortalities of aquatic species worldwide. A critical step in limiting virus replication, particularly early in infection, is the innate immune response. Presently, little is known regarding what innate immune strategies limit FV3 at the cellular level. To this end, the present study uses two rainbow trout cell lines, RTG-2 and RTgutGC, which demonstrate susceptible and relatively resistant phenotypes to FV3 infection, to elucidate susceptibility factors to FV3...
June 17, 2017: Virus Research
https://www.readbyqxmd.com/read/28634053/using-short-term-bioassays-to-evaluate-the-endocrine-disrupting-capacity-of-the-pesticides-linuron-and-fenoxycarb
#12
Petra Spirhanzlova, Bert De Groef, Freda E Nicholson, Sylvia V H Grommen, Giulia Marras, Anthony Sébillot, Barbara A Demeneix, Sophie Pallud-Mothré, Gregory F Lemkine, Andrew J Tindall, David Du Pasquier
Several short-term whole-organism bioassays based on transgenic aquatic models are now under validation by the OECD (Organization for Economic Co-operation and Development) to become standardized test guidelines for the evaluation of the endocrine activity of substances. Evaluation of the endocrine disrupting capacity of pesticides will be a domain of applicability of these future reference tests. The herbicide linuron and the insecticide fenoxycarb are two chemicals commonly used in agricultural practices...
June 17, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28633946/microplastics-in-gut-contents-of-coastal-freshwater-fish-from-r%C3%A3-o-de-la-plata-estuary
#13
Rocío S Pazos, Tomás Maiztegui, Darío C Colautti, Ariel H Paracampo, Nora Gómez
The presence of microplastics (MPs) in gut contents of coastal freshwater fish of the Rio de la Plata estuary was studied. Samples were taken in six sites where 87 fish belonging to 11 species and four feeding habits were captured. Presence of MPs was verified in the 100% of fish. The fibres represented the 96% of MPs found. The number of MPs in gut contents was significantly higher close to sewage discharge. There was not found relationship between number of MPs and fish length, weight or feeding habit. The spatial differences in mean number of MPs in fish observed in this study, suggest that environmental availability of MPs could be of great importance to explain the differences found among sampling sites analysed...
June 17, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28633651/epidemiology-of-intestinal-helminthiasis-among-school-children-with-emphasis-on-schistosoma-mansoni-infection-in-wolaita-zone-southern-ethiopia
#14
Bereket Alemayehu, Zewdneh Tomass, Fiseha Wadilo, Dawit Leja, Song Liang, Berhanu Erko
BACKGROUND: Intestinal helminth infections are major parasitic diseases causing public health problems in Ethiopia. Although the epidemiology of these infections are well documented in Ethiopia, new transmission foci for schistosomiasis are being reported in different parts of the country. The objective of this study was to assess the prevalence of Schistosoma mansoni and other intestinal helminth infections among school children and determine the endemicity of schistosomiasis in Wolaita Zone, southern Ethiopia...
June 20, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28633328/identification-and-characterization-of-a-solute-carrier-cia8-involved-in-inorganic-carbon-acclimation-in-chlamydomonas-reinhardtii
#15
Marylou C Machingura, Joanna Bajsa-Hirschel, Susan M Laborde, Joshua B Schwartzenburg, Bratati Mukherjee, Ananya Mukherjee, Steve V Pollock, Britta Förster, G Dean Price, James V Moroney
The supply of inorganic carbon (Ci) at the site of fixation by Rubisco is a key parameter for efficient CO2 fixation in aquatic organisms including the green alga, Chlamydomonas reinhardtii. Chlamydomonas reinhardtii cells, when grown on limiting CO2, have a CO2-concentrating mechanism (CCM) that functions to concentrate CO2 at the site of Rubisco. Proteins thought to be involved in inorganic carbon uptake have been identified and localized to the plasma membrane or chloroplast envelope. However, current CCM models suggest that additional molecular components are involved in Ci uptake...
June 13, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28633304/molecular-aspects-of-the-biophysical-co2-concentrating-mechanism-and-its-regulation-in-marine-diatoms
#16
Yoshinori Tsuji, Kensuke Nakajima, Yusuke Matsuda
Diatoms operate a CO2-concentrating mechanism (CCM) that drives upwards of 20% of annual global primary production. Recent progress in CCM research in the marine pennate diatom Phaeodactylum tricornutum revealed that this diatom directly takes up HCO3- from seawater through low-CO2-inducible plasma membrane HCO3- transporters, which belong to the solute carrier (SLC) 4 family. Apart from this, studies of carbonic anhydrases (CAs) in diatoms have revealed considerable diversity in classes and localization among species...
June 13, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28633113/transformation-and-toxicity-assessment-of-two-uv-filters-using-uv-h2o2-process
#17
Mingguo Peng, Erdeng Du, Zhihong Li, Dongdong Li, Huajie Li
The treatment of two typical UV filters benzophenone-4 (BP4) and benzophenone-9 (BP9) was evaluated in aqueous solutions by UV/H2O2 process. High-resolution accurate mass spectrometry (HRMS) was used to identify the degradation intermediates. A total of 12 BP4 degradation products and 17 BP9 degradation products were identified. A series of OH-initiated reactions, including hydroxylation, dihydroxylation, decarboxylation, demethylation, and ring breaking, lead to the final mineralization of BP4 and BP9. The degradation mechanisms of BP4 and BP9 are also proposed, separately...
June 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28633104/transcriptional-and-cellular-effects-of-paracetamol-in-the-oyster-crassostrea-gigas
#18
M J Bebianno, A C P Mello, M A S Serrano, F Flores-Nunes, J J Mattos, F L Zacchi, C E Piazza, M N Siebert, R S Piazza, C H A M Gomes, C M R Melo, A C D Bainy
Acetaminophen (paracetamol) (PAR) is one of the most popular non-steroidal anti-inflammatory drugs (NSAIDs) with analgesic and antipyretic properties consumed worldwide and often detected in the aquatic environment. Due to the fact that PAR induces oxidative stress in mammals, the aim of this study was to evaluate if similar effects were observed in oysters Crassostrea gigas, given their economic and ecological importance and worldwide distribution. Oysters were exposed for 1, 4 and 7 days to two different sublethal PAR concentrations (0, 1 and 100μgL(-1))...
June 17, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28633103/dietary-risk-ranking-for-residual-antibiotics-in-cultured-aquatic-products-around-tai-lake-china
#19
Chao Song, Le Li, Cong Zhang, Liping Qiu, Limin Fan, Wei Wu, Shunlong Meng, Gengdong Hu, Jiazhang Chen, Ying Liu, Aimin Mao
Antibiotics are widely used in aquaculture and therefore may be present as a dietary risk in cultured aquatic products. Using the Tai Lake Basin as a study area, we assessed the presence of 15 antibiotics in 5 widely cultured aquatic species using a newly developed dietary risk ranking approach. By assigning scores to each factor involved in the ranking matrices, the scores of dietary risks per antibiotic and per aquatic species were calculated. The results indicated that fluoroquinolone antibiotics posed the highest dietary risk in all aquatic species...
June 17, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28633102/an-integrated-assessment-of-ceftazidime-and-photoproducts-on-the-feeding-behavior-of-rotifers-from-exposure-to-post-exposure
#20
Yanhua Liu, Yaqi Wang, Jie Zhang, Liu Sun, Anqi Zhang, Oscar Lopez Torres, Ruixin Guo, Jianqiu Chen
Compared to traditional toxicological studies, which depict the dose-effect of contaminants themselves on organisms at the given time, the exposure and post-exposure impacts of antibiotic ceftazidime and its photoproducts are carried out to systematically evaluate the environmental risk fate of ceftazidime in aquatic environments. For the exposure process, the promotion effect of ceftazidime on the feeding behavior of the rotifers decreased when the target compound was irradiated by sunlight, and the promotion effect was converted into inhibition effect, which indicated that the highest toxicity of ceftazidime on the feeding behavior of the rotifers was found after UV-B irradiation...
June 17, 2017: Ecotoxicology and Environmental Safety
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