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https://www.readbyqxmd.com/read/28345898/hydrolysis-of-ionic-phthalic-acid-based-polyesters-by-wastewater-microorganisms-and-their-enzymes
#1
Karolina Haernvall, Sabine Zitzenbacher, Katrin Wallig, Motonori Yamamoto, Michael Bernhard Schick, Doris Ribitsch, Georg M Guebitz
Water-soluble polyesters are used in a range of applications today and enter wastewater treatment plants after product utilization. However, little is known about extracellular enzymes and aquatic microorganisms involved in polyester biodegradation and mineralization. In this study, structurally different ionic phthalic acid based polyesters (the number average molecular weights (Mn) 1,770 to 10,000 g/mol and semi crystalline with crystallinity below 1%) were synthesized in various combinations. Typical wastewater microorganisms like Pseudomonas sp...
March 27, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28345631/structure-of-the-cyanuric-acid-hydrolase-trzd-reveals-product-exit-channel
#2
Asim K Bera, Kelly G Aukema, Mikael Elias, Lawrence P Wackett
Cyanuric acid hydrolases are of industrial importance because of their use in aquatic recreational facilities to remove cyanuric acid, a stabilizer for the chlorine. Degradation of excess cyanuric acid is necessary to maintain chlorine disinfection in the waters. Cyanuric acid hydrolase opens the cyanuric acid ring hydrolytically and subsequent decarboxylation produces carbon dioxide and biuret. In the present study, we report the X-ray structure of TrzD, a cyanuric acid hydrolase from Acidovorax citrulli. The crystal structure at 2...
March 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28345035/terrestrial-support-of-lake-food-webs-synthesis-reveals-controls-over-cross-ecosystem-resource-use
#3
Andrew J Tanentzap, Brian W Kielstra, Grace M Wilkinson, Martin Berggren, Nicola Craig, Paul A Del Giorgio, Jonathan Grey, John M Gunn, Stuart E Jones, Jan Karlsson, Christopher T Solomon, Michael L Pace
Widespread evidence that organic matter exported from terrestrial into aquatic ecosystems supports recipient food webs remains controversial. A pressing question is not only whether high terrestrial support is possible but also what the general conditions are under which it arises. We assemble the largest data set, to date, of the isotopic composition (δ(2)H, δ(13)C, and δ(15)N) of lake zooplankton and the resources at the base of their associated food webs. In total, our data set spans 559 observations across 147 lakes from the boreal to subtropics...
March 2017: Science Advances
https://www.readbyqxmd.com/read/28340455/toxicological-and-behavioral-responses-as-a-tool-to-assess-the-effects-of-natural-and-synthetic-dyes-on-zebrafish-early-life
#4
Flavia R Abe, Jacqueline N Mendonça, Luiz A B Moraes, Gisele A R de Oliveira, Carlos Gravato, Amadeu M V M Soares, Danielle P de Oliveira
Organic dyes extracted from natural sources have been widely used to develop safety and eco-friendly dyes as an alternative to synthetic ones, since the latter are usually precursors of mutagenic compounds. Thereby, toxicity tests to non-target organisms are critical step to develop harmless dyes to environment and in this context, zebrafish early life stages are becoming an important alternative model. We aimed to assess the toxic effects of the synthetic dye Basic Red 51 (BR51, used in cosmetic industry), the natural dye erythrostominone (ERY, a potential commercial dye extracted from fungi) and its photodegradation product (DERY), using zebrafish early life assays...
March 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28340369/degradation-of-diclofenac-by-uv-activated-persulfate-process-kinetic-studies-degradation-pathways-and-toxicity-assessments
#5
Xian Lu, Yisheng Shao, Naiyun Gao, Juxiang Chen, Yansen Zhang, Huiming Xiang, Youluo Guo
Diclofenac (DCF) is the frequently detected non-steroidal pharmaceuticals in the aquatic environment. In this study, the degradation of DCF was evaluated by UV-254nm activated persulfate (UV/PS). The degradation of DCF followed the pseudo first-order kinetics pattern. The degradation rate constant (kobs) was accelerated by UV/PS compared to UV alone and PS alone. Increasing the initial PS dosage or solution pH significantly enhanced the degradation efficiency. Presence of various natural water constituents had different effects on DCF degradation, with an enhancement or inhibition in the presence of inorganic anions (HCO3(-) or Cl(-)) and a significant inhibition in the presence of NOM...
March 21, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28339349/is-triclosan-a-neurotoxic-agent
#6
Joanna A Ruszkiewicz, Shaojun Li, Maliya B Rodriguez, Michael Aschner
Triclosan (TCS) is an antibacterial agent that has been used in many products since 1960s. Given its broad usage as an antiseptic TCS is present ubiquitously in the environment. Trace levels of TCS continue to be detected in many organisms, and it has been shown to be particularly toxic to aquatic species. The mechanisms underlying TCS-mediated toxicity include hormone dyshomeostasis, induction of oxidative stress, apoptosis and inflammation. Although TCS has been considered to be non-toxic to mammals, the adverse effects of continuous, long-term and low concentration exposure remain unknown...
2017: Journal of Toxicology and Environmental Health. Part B, Critical Reviews
https://www.readbyqxmd.com/read/28337403/an-expanded-conceptual-framework-for-solution-focused-management-of-chemical-pollution-in-european-waters
#7
John Munthe, Eva Brorström-Lundén, Magnus Rahmberg, Leo Posthuma, Rolf Altenburger, Werner Brack, Dirk Bunke, Guy Engelen, Bernd Manfred Gawlik, Jos van Gils, David López Herráez, Tomas Rydberg, Jaroslav Slobodnik, Annemarie van Wezel
BACKGROUND: This paper describes a conceptual framework for solutions-focused management of chemical contaminants built on novel and systematic approaches for identifying, quantifying and reducing risks of these substances. METHODS: The conceptual framework was developed in interaction with stakeholders representing relevant authorities and organisations responsible for managing environmental quality of water bodies. Stakeholder needs were compiled via a survey and dialogue...
2017: Environmental Sciences Europe
https://www.readbyqxmd.com/read/28336855/behavior-and-potential-impacts-of-metal-based-engineered-nanoparticles-in-aquatic-environments
#8
REVIEW
Cheng Peng, Wen Zhang, Haiping Gao, Yang Li, Xin Tong, Kungang Li, Xiaoshan Zhu, Yixiang Wang, Yongsheng Chen
The specific properties of metal-based nanoparticles (NPs) have not only led to rapidly increasing applications in various industrial and commercial products, but also caused environmental concerns due to the inevitable release of NPs and their unpredictable biological/ecological impacts. This review discusses the environmental behavior of metal-based NPs with an in-depth analysis of the mechanisms and kinetics. The focus is on knowledge gaps in the interaction of NPs with aquatic organisms, which can influence the fate, transport and toxicity of NPs in the aquatic environment...
January 22, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336489/current-applications-selection-and-possible-mechanisms-of-actions-of-synbiotics-in-improving-the-growth-and-health-status-in-aquaculture-a-review
#9
REVIEW
Truong-Giang Huynh, Ya-Li Shiu, Thanh-Phuong Nguyen, Quoc-Phu Truong, Jiann-Chu Chen, Chun-Hung Liu
Synbiotics, a conjunction between prebiotics and probiotics, have been used in aquaculture for over 10 years. However, the mechanisms of how synbiotics work as growth and immunity promoters are far from being unraveled. Here, we show that a prebiotic as part of a synbiotic is hydrolyzed to mono- or disaccharides as the sole carbon source with diverse mechanisms, thereby increasing biomass and colonization that is established by specific crosstalk between probiotic bacteria and the surface of intestinal epithelial cells of the host...
March 20, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28335565/an-eco-safety-assessment-of-glyoxal-containing-cellulose-ether-on-freeze-dried-microbial-strain-cyanobacteria-daphnia-and-zebrafish
#10
Chang-Beom Park, Min Ju Song, Nak Woon Choi, Sunghoon Kim, Hyun Pyo Jeon, Sanghun Kim, Youngjun Kim
The objective of this study was to investigate the aquatic-toxic effects of glyoxal-containing cellulose ether with four different glyoxal concentrations (0%, 1.4%, 2.3%, and 6.3%) in response to global chemical regulations, e.g., European Union Classification, Labeling and Packaging (EU CLP). Toxicity tests of glyoxal-containing cellulose ether on 11 different microbial strains, Microcystis aeruginosa, Daphnia magna, and zebrafish embryos were designed as an initial stage of toxicity screening and performed in accordance with standardized toxicity test guidelines...
March 21, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28335448/a-community-multi-omics-approach-towards-the-assessment-of-surface-water-quality-in-an-urban-river-system
#11
David J Beale, Avinash V Karpe, Warish Ahmed, Stephen Cook, Paul D Morrison, Christopher Staley, Michael J Sadowsky, Enzo A Palombo
A multi-omics approach was applied to an urban river system (the Brisbane River (BR), Queensland, Australia) in order to investigate surface water quality and characterize the bacterial population with respect to water contaminants. To do this, bacterial metagenomic amplicon-sequencing using Illumina next-generation sequencing (NGS) of the V5-V6 hypervariable regions of the 16S rRNA gene and untargeted community metabolomics using gas chromatography coupled with mass spectrometry (GC-MS) were utilized. The multi-omics data, in combination with fecal indicator bacteria (FIB) counts, trace metal concentrations (by inductively coupled plasma mass spectrometry (ICP-MS)) and in-situ water quality measurements collected from various locations along the BR were then used to assess the health of the river ecosystem...
March 14, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28334672/effects-of-4-mbc-and-triclosan-in-embryos-of-the-frog-pelophylax-perezi
#12
Diana Martins, Marta S Monteiro, Amadeu M V M Soares, Carla Quintaneiro
The widespread and increasing use of personal care products (PCPs) have led to environmental contamination by substances included in these products. These substances have been detected in aquatic compartments and shown to cause adverse effects on non-target aquatic organisms. In this work toxicity of the antimicrobial triclosan (TCS) and of the UV-filter 3-(4-methylbenzylidene) camphor (4-MBC) was assessed in the embryos of Perez' frog Pelophylax perezi. Lethal and sub-lethal parameters were evaluated in embryos in Gosner stage 8-9 exposed to 0...
March 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/28330194/exploited-application-of-sulfate-reducing-bacteria-for-concomitant-treatment-of-metallic-and-non-metallic-wastes-a-mini-review
#13
REVIEW
Ali Hussain, Ali Hasan, Arshad Javid, Javed Iqbal Qazi
A variety of multidimensional anthropogenic activities, especially of industrial level, are contaminating our aquatic and terrestrial environments with a variety of metallic and non-metallic pollutants. The metallic and non-metallic pollutants addressed specifically in this review are heavy metals and various compound forms of sulfates, respectively. Direct and indirect deleterious effects of the both types of pollutants to all forms of life are well-known. The treatment of such pollutants is therefore much necessary before their final discharge into the environment...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28328933/water-borne-pharmaceuticals-reduce-phenotypic-diversity-and-response-capacity-of-natural-phytoplankton-communities
#14
Francesco Pomati, Jukka Jokela, Sara Castiglioni, Mridul K Thomas, Luca Nizzetto
Chemical micropollutants occur worldwide in the environment at low concentrations and in complex mixtures, and how they affect the ecology of natural systems is still uncertain. Dynamics of natural communities are driven by the interaction between individual organisms and their growth environment, which is mediated by the organisms' expressed phenotypic traits. We tested whether exposure to a mixture of 12 pharmaceuticals and personal care products (PPCP) influences phenotypic trait diversity in lake phytoplankton communities and their ability to regulate biomass production to fit environmental changes (response capacity)...
2017: PloS One
https://www.readbyqxmd.com/read/28328079/intraspecific-chemical-communication-in-microalgae
#15
REVIEW
Marianna Venuleo, John A Raven, Mario Giordano
Contents I. II. III. IV. V. VI. VII. References SUMMARY: The relevance of infochemicals in the relationships between organisms is emerging as a fundamental aspect of aquatic ecology. Exchanges of chemical cues are likely to occur not only between organisms of different species, but also between conspecific individuals. Especially intriguing is the investigation of chemical communication in microalgae, because of the relevance of these organisms for global primary production and their key role in trophic webs...
March 22, 2017: New Phytologist
https://www.readbyqxmd.com/read/28325594/assessment-of-multi-trophic-changes-in-a-shallow-boreal-lake-simultaneously-exposed-to-climate-change-and-aerial-deposition-of-contaminants-from-the-athabasca-oil-sands-region-canada
#16
Jamie C Summers, Joshua Kurek, Kathleen M Rühland, Erin E Neville, John P Smol
The Athabasca Oil Sands Region (AOSR) has been intensely developed for industrial bitumen extraction and upgrading since the 1980s. A paucity of environmental monitoring prior to development raises questions about baseline conditions in freshwater systems in the region and ecological responses to industrial activities. Further, climatic changes prompt questions about the relative roles of climate and industry in shaping aquatic ecosystems through time. We use aquatic bioindicators from multiple trophic levels, concentrations of petrogenic contaminants (dibenzothiophenes), and spectrally-inferred chlorophyll-a preserved in well-dated sediments of a closed-basin, shallow lake ~50km away from the main area of industry, in conjunction with climate observations, to assess how the biotic assemblages of a typical AOSR lake have changed during the past ~75years...
March 18, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28321700/thermoactivated-persulfate-oxidation-of-pesticide-chlorpyrifos-in-aquatic-system-kinetic-and-mechanistic-investigations
#17
Lei Zhou, Ya Zhang, Rongrong Ying, Guoqing Wang, Tao Long, Jianhua Li, Yusuo Lin
The widespread occurrence of organophosphorus pesticides (OPPs) in the environment poses risks to both ecologic system as well as human health. This study investigated the oxidation kinetics of chlorpyrifos (CP), one of the typical OPPs, by thermoactivated persulfate (PS) oxidation process, and evaluated the influence of key kinetic factors, such as PS concentrations, pH, temperature, bicarbonate, and chloride ions. The reaction pathways and mechanisms were also proposed based on products identification by LC-MS techniques...
March 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28321680/environmental-effects-of-crude-oil-spill-on-the-physicochemical-and-hydrobiological-characteristics-of-the-nun-river-niger-delta
#18
Augustine O Ifelebuegu, Justina E Ukpebor, Anita U Ahukannah, Ernest O Nnadi, Stephen C Theophilus
Oil spill pollution has remained a source of several international litigations in the Niger Delta region of Nigeria. In this paper, we examined the impacts of small recurrent crude oil spills on the physicochemical, microbial and hydrobiological properties of the Nun River, a primary source of drinking water, food and recreational activities for communities in the region. Samples were collected from six sampling points along the stretch of the lower Nun River over a 3-week period. Temperature, pH salinity, turbidity, total suspended solids, total dissolved solids, dissolved oxygen, phosphate, nitrate, heavy metals, BTEX, PAHs and microbial and plankton contents were assessed to ascertain the quality and level of deterioration of the river...
April 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28314726/global-distribution-patterns-and-pangenomic-diversity-of-the-candidate-phylum-latescibacteria-ws3
#19
Ibrahim F Farag, Noha H Youssef, Mostafa S Elshahed
We investigated the global distribution patterns and pangenomic diversity of the candidate phylum "Latescibacteria" (WS3) in 16S rRNA gene as well as metagenomic datasets. We document distinct distribution patterns for various "Latescibacteria" orders in 16S rRNA gene datasets, with prevalence of orders sediment_1 in terrestrial, PBSIII_9 in groundwater and temperate freshwater, and GN03 in pelagic marine, saline-hypersaline, and wastewater habitats. Using a fragment recruitment approach, we identified 68.9 Mb of "Latescibacteria"-affiliated contigs in publicly available metagenomic datasets comprising 73,079 proteins...
March 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28303510/enhanced-resistance-against-vibrio-harveyi-infection-by-carvacrol-and-its-association-with-the-induction-of-heat-shock-protein-72-in-gnotobiotic-artemia-franciscana
#20
Kartik Baruah, Parisa Norouzitallab, Ho Phuong Pham Duy Phong, Guy Smagghe, Peter Bossier
Induction of HSP72 is a natural response of stressed organisms that protects against many insults including bacterial diseases in farm (aquatic) animals. It would therefore be of great health benefit to search for natural compounds that are clinically safe yet able to induce HSP72 in animals. The phenolic compound carvacrol, an approved food component, had been shown in in vitro study to act as a co-inducer of HSP72, enhancing HSP72 production only in combination with a bona fide stress compared to the compound alone...
March 16, 2017: Cell Stress & Chaperones
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