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https://www.readbyqxmd.com/read/28217926/reduction-oxidation-cycles-of-organic-matter-increase-bacterial-activity-in-the-pelagic-oxycline
#1
Maximilian P Lau, Michael Hupfer, Hans Peter Grossart
Dissolved organic matter (DOM) in aquatic ecosystems contains redox-active moieties, which are prone to oxidation and reduction reactions. Oxidized moieties feature reduction potentials Eh , so that the moieties may be used as terminal electron acceptors (TEAs) in microbial respiration with a thermodynamic energy yield between nitrate and sulfate reduction. Here, we study the response of pelagic freshwater bacteria to exposure to native DOM with varying availabilities of oxidized moieties and hence redox state...
February 20, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28214648/toxicity-degradation-and-metabolic-fate-of-ibuprofen-on-freshwater-diatom-navicula-sp
#2
Tengda Ding, Mengting Yang, Junmin Zhang, Bo Yang, Kunde Lin, Juying Li, Jay Gan
Ibuprofen (IBU) is one of the most widely used and frequently detected human pharmaceuticals in aquatic environment. However, the toxicity of IBU on diatom and its fate remain still unkown. In the present study, the toxicity of IBU on the diatom was evaluated by the algal growth rate, the chlorophyll-a and carotenoids contents. The degradation of IBU including in particular the potential for the formation of incomplete degradation products was also explored. Biochemical characteristics of Navicula sp. were significantly inhibited at IBU concentrations up to 50mgL(-1) after 10days of exposure...
February 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28213304/photocatalytic-effects-of-titanium-dioxide-nanoparticles-on-aquatic-organisms-current-knowledge-and-suggestions-for-future-research
#3
REVIEW
Vena N Haynes, J Evan Ward, Brandon J Russell, Alexander G Agrios
Nanoparticles are entering natural systems through product usage, industrial waste and post-consumer material degradation. As the production of nanoparticles is expected to increase in the next decade, so too are predicted environmental loads. Engineered metal-oxide nanomaterials, such as titanium dioxide, are known for their photocatalytic capabilities. When these nanoparticles are exposed to ultraviolet radiation in the environment, however, they can produce radicals that are harmful to aquatic organisms...
February 9, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28211329/first-report-of-perfluoroalkyl-substances-in-south-african-odonata
#4
Velesia Lesch, Hindrik Bouwman, Ayako Kinoshita, Yasuyuki Shibata
Perfluorinated substances are global and ubiquitous pollutants. However, very little is known about these substances in invertebrates, and even less in terrestrial invertebrates in particular. We analysed adult male dragonflies from six sites in South Africa for perfluoroalkyl substances (PFASs), including perfluorooctanesulfonic acid (PFOS), perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA), perfluorodecanoic acid (PFDA), perfluro-n-undecanoic acid (PFUnA), perfluoro-n-dodecanoic acid (PFDoA), perfluorohexanoic acid (PFHxA), and perfluorohexane sulfonic acid (PFHxS)...
February 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28211327/results-from-a-round-robin-test-for-the-ecotoxicological-evaluation-of-construction-products-using-two-leaching-tests-and-an-aquatic-test-battery
#5
Stefan Gartiser, Ines Heisterkamp, Ute Schoknecht, Michael Burkhardt, Monika Ratte, Outi Ilvonen, Frank Brauer, Jan Brückmann, André Dabrunz, Philipp Egeler, Andrea-Maria Eisl, Ute Feiler, Ines Fritz, Sabina König, Herbert Lebertz, Pascal Pandard, Gabriele Pötschke, Dirk Scheerbaum, Frank Schreiber, Přemysl Soldán, Roland Weiß, Reinhilde Weltens
A European round robin test according to ISO 5725-2 was conceptually prepared, realised, and evaluated. The aim was to determine the inter-laboratory variability of the overall process for the ecotoxicological characterization of construction products in eluates and bioassays. To this end, two construction products BAM-G1 (granulate) and HSR-2 (roof sealing sheet), both made of EPDM polymers (rubber), were selected. The granular construction product was eluted in a one stage batch test, the planar product in the Dynamic Surface Leaching test (DSLT)...
February 2, 2017: Chemosphere
https://www.readbyqxmd.com/read/28209247/water-hyacinth-a-potential-source-for-value-addition-an-overview
#6
REVIEW
Raveendran Sindhu, Parameswaran Binod, Ashok Pandey, Aravind Madhavan, Jose Anju Alphonsa, Narisetty Vivek, Edgard Gnansounou, Eulogio Castro, Vincenza Faraco
Water hyacinth a fresh water aquatic plant is considered as a noxious weed in many parts of the world since it grows very fast and depletes nutrients and oxygen from water bodies adversely affecting the growth of both plants and animals. Hence conversion of this problematic weed to value added chemicals and fuels helps in the self-sustainability especially for developing countries. The present review discusses the various value added products and fuels which can be produced from water hyacinth, the recent research and developmental activities on the bioconversion of water hyacinth for the production of fuels and value added products as well as its possibilities and challenges in commercialization...
January 25, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28208607/induction-of-diverse-bioactive-secondary-metabolites-from-the-mangrove-endophytic-fungus-trichoderma-sp-strain-307-by-co-cultivation-with-acinetobacter-johnsonii-strain-b2
#7
Liuhong Zhang, Shah Iram Niaz, Dilfaraz Khan, Zhen Wang, Yonghong Zhu, Haiyun Zhou, Yongcheng Lin, Jing Li, Lan Liu
Two new sesquiterpenes, microsphaeropsisin B (1) and C (2), and two new de-O-methyllasiodiplodins, (3R, 7R)-7-hydroxy-de-O-methyllasiodiplodin (4) and (3R)-5-oxo-de-O-methyllasiodiplodin (5), together with one new natural product (6) and twelve known compounds (3, 7-17), were isolated from the co-cultivation of mangrove endophytic fungus Trichoderma sp. 307 and aquatic pathogenic bacterium Acinetobacter johnsonii B2. Their structures, including absolute configurations, were elucidated by extensive analysis of spectroscopic data, electronic circular dichroism, Mo₂(AcO)₄-induced circular dichroism, and comparison with reported data...
February 10, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28208097/distribution-characteristics-of-volatile-methylsiloxanes-in-tokyo-bay-watershed-in-japan-analysis-of-surface-waters-by-purge-and-trap-method
#8
Yuichi Horii, Kotaro Minomo, Nobutoshi Ohtsuka, Mamoru Motegi, Kiyoshi Nojiri, Kurunthachalam Kannan
Surface waters including river water and effluent from sewage treatment plants (STPs) were collected from Tokyo Bay watershed, Japan, and analyzed for seven cyclic and linear volatile methylsiloxanes (VMSs), i.e., D3, D4, D5, D6, L3, L4, and L5 by an optimized purge and trap extraction method. The total concentrations of seven VMSs (ΣVMS) in river water ranged from <4.9 to 1700ng/L (mean: 220ng/L). The individual mean concentrations of cyclic VMSs in surface waters were; 10ng/L for D3, 13ng/L for D4, 180ng/L for D5, and 18ng/L for D6...
February 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28207309/multilocus-sequence-typing-and-staphylococcal-protein-a-typing-revealed-novel-and-diverse-clones-of-methicillin-resistant-staphylococcus-aureus-in-seafood-and-the-aquatic-environment
#9
V Murugadas, C Joseph Toms, Sara A Reethu, K V Lalitha
Methicillin-resistant Staphylococcus aureus (MRSA) has been a global health concern since the 1960s, and isolation of this pathogen from food-producing animals has been increasing. However, little information is available on the prevalence of MRSA and its clonal characteristics in seafood and the aquatic environment. In this study, 267 seafood and aquatic environment samples were collected from three districts of Kerala, India. Staphylococcal protein A (spa) typing and multilocus sequence typing (MLST) was performed for 65 MRSA strains isolated from 20 seafood and aquatic environment samples...
February 16, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28202811/small-birds-big-effects-the-little-auk-alle-alle-transforms-high-arctic-ecosystems
#10
Ivan González-Bergonzoni, Kasper L Johansen, Anders Mosbech, Frank Landkildehus, Erik Jeppesen, Thomas A Davidson
In some arctic areas, marine-derived nutrients (MDN) resulting from fish migrations fuel freshwater and terrestrial ecosystems, increasing primary production and biodiversity. Less is known, however, about the role of seabird-MDN in shaping ecosystems. Here, we examine how the most abundant seabird in the North Atlantic, the little auk (Alle alle), alters freshwater and terrestrial ecosystems around the North Water Polynya (NOW) in Greenland. We compare stable isotope ratios (δ(15)N and δ(13)C) of freshwater and terrestrial biota, terrestrial vegetation indices and physical-chemical properties, productivity and community structure of fresh waters in catchments with and without little auk colonies...
February 22, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28196786/assessing-the-chronic-toxicity-of-copper-and-aluminium-to-the-tropical-sea-anemone-exaiptasia-pallida
#11
Melanie A Trenfield, Joost W van Dam, Andrew J Harford, David Parry, Claire Streten, Karen Gibb, Rick A van Dam
The world's most productive bauxite mines and alumina refineries are located in tropical or sub-tropical regions. The discharge water from alumina refineries can contain elevated aluminium (Al, <0.45µm fraction), from 30 to 1000μg/L. There is a need for additional information on the toxicity of Al to aquatic organisms to improve the environmental regulation and management of alumina refinery operations in tropical coastal regions. A 14-d chronic toxicity test was developed for the tropical sea anemone Exaiptasia pallida...
February 11, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28196455/toxicological-perturbations-of-zinc-oxide-nanoparticles-in-the-coelatura-aegyptiaca-mussel
#12
Sohair R Fahmy, Dawlat A Sayed
More research is needed to understand the interactions of nanoparticles (NPs) with aquatic organisms and their mechanism of toxic action. Zinc oxide nanoparticles (ZnONPs) are the most used engineered metal oxide NPs in consumer products. The present study was designed to evaluate the cytotoxicity, genotoxicity and digestive gland (DG) as well as gill histopathology of the freshwater molluscan bivalve Coelatura aegyptiaca following exposure to ZnONPs (2, 10 and 50 mg/L) for 6 consecutive days. Exposure to ZnONPs (10 and 50 mg/L) induced a significant increase in malondialdehyde, superoxide dismutase and nitric oxide with a concomitant decrease in reduced glutathione, glutathione-S-transferase and catalase levels in the haemolymph, DG and gills of the treated mussels...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28193590/fast-identification-of-microplastics-in-complex-environmental-samples-by-a-thermal-degradation-method
#13
Erik Dümichen, Paul Eisentraut, Claus Gerhard Bannick, Anne-Kathrin Barthel, Rainer Senz, Ulrike Braun
In order to determine the relevance of microplastic particles in various environmental media, comprehensive investigations are needed. However, no analytical method exists for fast identification and quantification. At present, optical spectroscopy methods like IR and RAMAN imaging are used. Due to their time consuming procedures and uncertain extrapolation, reliable monitoring is difficult. For analyzing polymers Py-GC-MS is a standard method. However, due to a limited sample amount of about 0.5 mg it is not suited for analysis of complex sample mixtures like environmental samples...
February 3, 2017: Chemosphere
https://www.readbyqxmd.com/read/28192727/ecotoxicological-assessments-show-sucralose-and-fluoxetine-affect-the-aquatic-plant-lemna-minor
#14
Cherisse Amy-Sagers, Keith Reinhardt, Danelle M Larson
Pharmaceuticals and personal care products (PPCP) are prevalent in aquatic systems, yet the fate and impacts on aquatic plants needs quantification for many compounds. We measured and detected sucralose (an artificial sweetener), fluoxetine (an antidepressant), and other PPCP in the Portneuf River in Idaho, USA, where Lemna minor (an aquatic plant in the environment and used in ecotoxicology studies) naturally occurs. Sucralose was hypothesized to negatively affect photosynthesis and growth of L. minor because sucralose is a chlorinated molecule that may be toxic or unusable for plant metabolism...
January 19, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28187397/environmental-safety-review-of-methoprene-and-bacterially-derived-pesticides-commonly-used-for-sustained-mosquito-control
#15
REVIEW
Sharon P Lawler
Some pesticides are applied directly to aquatic systems to reduce numbers of mosquito larvae (larvicides) and thereby reduce transmission of pathogens that mosquitoes vector to humans and wildlife. Sustained, environmentally-safe control of larval mosquitoes is particularly needed for highly productive waters (e.g., catchment basins, water treatment facilities, septic systems), but also for other habitats to maintain control and reduce inspection costs. Common biorational pesticides include the insect juvenile hormone mimic methoprene and pesticides derived from the bacteria Bacillus thuringiensis israelensis, Lysinibacillus sphaericus and Saccharopolyspora spinosa (spinosad)...
February 7, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28187361/toxicity-of-abamectin-and-difenoconazole-mixtures-to-a-neotropical-cladoceran-after-simulated-run-off-and-spray-drift-exposure
#16
Raquel Aparecida Moreira, Michiel Adriaan Daam, Bruna Horvath Vieira, Ana Letícia Madeira Sanches, Marina Vanderlei Reghini, Adrislaine da Silva Mansano, Emanuela Cristina de Freitas, Evaldo Luiz Gaeta Espindola, Odete Rocha
Aquatic risk assessments of pesticides in tropical countries have often been disputed for being largely based on risk evaluations conducted in temperate regions. Although pesticide sensitivity comparisons between temperate and tropical freshwater organisms have indeed not revealed consistent differences, risk assessments are currently still based on a relatively small tropical toxicity dataset. In addition, greater levels of runoff and spray drift may be expected in tropical than in temperate agroecosystems, indicating that aquatic life in edge-of-field water bodies is likely to be subjected to higher concentrations of pesticides and their mixtures...
February 3, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28185732/water-resources-management-in-the-urban-agglomeration-of-the-lake-biwa-region-japan-an-ecosystem-services-based-sustainability-assessment
#17
Xiaochen Chen, Yuqing Chen, Toshiyuki Shimizu, Jia Niu, Ken'ichi Nakagami, Xuepeng Qian, Baoju Jia, Jun Nakajima, Ji Han, Jianhua Li
An innovative ecosystem services-based sustainability assessment was conducted in the important urban agglomeration of the Lake Biwa region, Japan, covering the time period from 1950 to 2014. A 22-indicator system was established that was based on the major ecosystem services of Lake Biwa and its water courses, i.e., provisioning services regarding aquatic products and water; regulating services regarding floods and water quality; cultural services regarding recreation and tourism, scientific research, and environmental education; and supporting services regarding biodiversity...
February 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28183058/in%C3%A2-vitro-and-in%C3%A2-vivo-investigation-of-the-genotoxic-potential-of-waters-from-rivers-under-the-influence-of-a-petroleum-refinery-s%C3%A3-o-paulo-state-brazil
#18
Raquel Vaz Hara, Maria Aparecida Marin-Morales
In recent years concern about the chemical composition of wastewater generated by the oil refining industry has increased, even after its treatment. These wastewaters contain substances that can harm both the entire aquatic ecosystem and the health of any exposed organisms. The aim of this study was to evaluate the genotoxic and mutagenic potentials of the effluent generated by the largest Brazilian petroleum refinery, the effectiveness of the treatments used by the refinery, and whether its effluent can compromise the water quality of the river where it is discarded...
January 31, 2017: Chemosphere
https://www.readbyqxmd.com/read/28182957/heteroagglomeration-of-zinc-oxide-nanoparticles-with-clay-mineral-modulates-the-bioavailability-and-toxicity-of-nanoparticle-in-tetrahymena-pyriformis
#19
Govind Sharan Gupta, Violet Aileen Senapati, Alok Dhawan, Rishi Shanker
The extensive use of zinc oxide nanoparticles (ZnO NPs) in cosmetics, sunscreens and healthcare products increases their release in the aquatic environment. The present study explored the possible interaction of ZnO NPs with montmorillonite clay minerals in aqueous conditions. An addition of ZnO NPs on clay suspension significantly (p<0.05) increases the hydrodymic size of clay particles from 1652±90nm to 2158±13nm due to heteroagglomeration. The electrokinetic measurements showed a significant (p<0...
January 27, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28181560/responses-of-the-marine-diatom-thalassiosira-pseudonana-to-changes-in-co2-concentration-a-proteomic-approach
#20
Romain Clement, Sabrina Lignon, Pascal Mansuelle, Erik Jensen, Matthieu Pophillat, Regine Lebrun, Yann Denis, Carine Puppo, Stephen C Maberly, Brigitte Gontero
The concentration of CO2 in many aquatic systems is variable, often lower than the KM of the primary carboxylating enzyme Rubisco, and in order to photosynthesize efficiently, many algae operate a facultative CO2 concentrating mechanism (CCM). Here we measured the responses of a marine diatom, Thalassiosira pseudonana, to high and low concentrations of CO2 at the level of transcripts, proteins and enzyme activity. Low CO2 caused many metabolic pathways to be remodeled. Carbon acquisition enzymes, primarily carbonic anhydrase, stress, degradation and signaling proteins were more abundant while proteins associated with nitrogen metabolism, energy production and chaperones were less abundant...
February 9, 2017: Scientific Reports
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