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https://www.readbyqxmd.com/read/28743092/polycyclic-aromatic-hydrocarbons-pahs-enrich-their-degrading-genera-and-genes-in-human-impacted-aquatic-environments
#1
Ke Yuan, Baowei Chen, Qing Qing, Shichun Zou, Xiaowei Wang, Tiangang Luan
Bacterial degradation is an important clearance pathway for organic contaminants from highly human-impacted environments. However, it is not fully understood how organic contaminants are selected for degradation by bacteria and genes in aquatic environments. In this study, PAH degrading bacterial genera and PAH-degradation-related genes (PAHDGs) in sediments collected from the Pearl River (PR), the Pearl River Estuary (PRE) and the South China Sea (SCS), among which there were distinct differences in anthropogenic impact, were analyzed using metagenomic approaches...
July 22, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28743021/evolution-an-irresistibly-clear-view-of-land
#2
Dan-E Nilsson
Visually guided predation is range-limited in water, but works over long distances on land. This may have driven our last aquatic ancestors to evolve large eyes on the top of their head for spotting crunchy meals on ancient riverbanks.
July 24, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28742284/aquatic-animals-promote-antibiotic-resistance-gene-dissemination-in-water-via-conjugation-role-of-different-regions-within-the-zebra-fish-intestinal-tract-and-impact-on-fish-intestinal-microbiota
#3
Jialun Fu, Dong Yang, Min Jin, Weili Liu, Xin Zhao, Chenyu Li, Tianyu Zhao, Jingfeng Wang, Zhixian Gao, Zhiqiang Shen, Zhigang Qiu, Jun-Wen Li
The aqueous environment is one of many reservoirs of antibiotic resistance genes (ARGs). Fish, as important aquatic animals which possess ideal intestinal niches for bacteria to grow and multiply, may ingest antibiotic resistance bacteria from aqueous environment. The fish gut would be a suitable environment for conjugal gene transfer including those encoding antibiotic resistance. However, little is known in relation to the impact of ingested ARGs or ARB on gut microbiota. Here, we applied the cultivation method, qPCR, nuclear molecular genetic marker and 16S rDNA amplicon sequencing technologies to develop a plasmid-mediated ARG transfer model of zebrafish...
July 25, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28742122/main-predictors-of-periphyton-species-richness-depend-on-adherence-strategy-and-cell-size
#4
Vanessa Majewski Algarte, Tadeu Siqueira, Victor Lemes Landeiro, Liliana Rodrigues, Claudia Costa Bonecker, Luzia Cleide Rodrigues, Natália Fernanda Santana, Sidinei Magela Thomaz, Luis Mauricio Bini
Periphytic algae are important components of aquatic ecosystems. However, the factors driving periphyton species richness variation remain largely unexplored. Here, we used data from a subtropical floodplain (Upper Paraná River floodplain, Brazil) to quantify the influence of environmental variables (total suspended matter, temperature, conductivity, nutrient concentrations, hydrology, phytoplankton biomass, phytoplankton species richness, aquatic macrophyte species richness and zooplankton density) on overall periphytic algal species richness and on the richness of different algal groups defined by morphological traits (cell size and adherence strategy)...
2017: PloS One
https://www.readbyqxmd.com/read/28742070/growth-arrest-and-a-persister-state-enable-resistance-to-osmotic-shock-and-facilitate-dissemination-of-vibrio-cholerae
#5
Cecilia A Silva-Valenzuela, David W Lazinski, Shoshanna C Kahne, Y Nguyen, Roberto C Molina-Quiroz, Andrew Camilli
Vibrio cholerae is a water-borne bacterial pathogen and causative agent of cholera. Although V. cholerae is a halophile, it can survive in fresh water, and this has a major role in cholera epidemics through consumption of contaminated water and subsequent fecal-oral spread. After dissemination from humans back into fresh water, V. cholerae encounters limited nutrient availability and an abrupt drop in conductivity but little is known about how V. cholerae adapts to, and survives in this environment. In this work, by abolishing or altering the expression of V...
July 25, 2017: ISME Journal
https://www.readbyqxmd.com/read/28741297/maldi-ft-icr-ms-for-archaeological-lipid-residue-analysis
#6
Ester Oras, Signe Vahur, Sven Isaksson, Ivari Kaljurand, Ivo Leito
Soft-ionization methods are currently at the forefront of developing novel methods for analysing degraded archaeological organic residues. Here we present little-used soft ionisation method of matrix assisted laser desorption/ionization - Fourier transform - ion cyclotron resonance - mass spectrometry (MALDI-FT-ICR-MS) for the identification of archaeological lipid residues. It is a high-resolution and sensitive method with low limits of detection capable of identifying lipid compounds in small concentrations, thus providing a highly potential new technique for the analysis of degraded lipid components...
July 24, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28741247/contaminants-of-emerging-concern-a-review-of-new-approach-in-aop-technologies
#7
Maryam Salimi, Ali Esrafili, Mitra Gholami, Ahmad Jonidi Jafari, Roshanak Rezaei Kalantary, Mahdi Farzadkia, Majid Kermani, Hamid Reza Sobhi
The presence of contaminants of emerging concern (CECs) such as pharmaceuticals and personal care products (PPCPs), endocrine-disrupting compounds (EDCs), flame retardants (FRs), pesticides, and artificial sweeteners (ASWs) in the aquatic environments remains a major challenge to the environment and human health. In this review, the classification and occurrence of emerging contaminants in aquatic environments were discussed in detail. It is well documented that CECs are susceptible to poor removal during the conventional wastewater treatment plants, which introduce them back to the environment ranging from nanogram per liter (e...
August 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28741210/effects-of-bpf-on-steroid-hormone-homeostasis-and-gene-expression-in-the-hypothalamic-pituitary-gonadal-axis-of-zebrafish
#8
Qian Yang, Xianhai Yang, Jining Liu, Wenjuan Ren, Yingwen Chen, Shubao Shen
Bisphenol F (BPF) has been frequently detected in various environmental compartments, and previous studies found that BPF exhibits similar estrogenic and anti-androgenic effects on the mammalian endocrine system to those of bisphenol A (BPA). However, the potential disrupting effects of BPF on aquatic organisms and the underling disrupting mechanisms have not been investigated. In this study, the potential disrupting mechanisms of BPF on the hypothalamic-pituitary-gonadal (HPG) axis and liver were probed by employing the OECD 21-day short-term fecundity assay in zebrafish...
July 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28739107/hydrostatic-pressure-and-the-experimental-toxicology-of-marine-fishes-the-elephant-in-the-room
#9
Benjamin Lemaire
Hydrostatic pressure (HP) increases linearly with depth in aquatic environments, so that many fish species routinely experience moderate-to-high HP levels (i.e., from a few to dozens of MPa). Biological effects of this thermodynamic variable are evidenced by a reduced functionality of many biomolecular systems, even in barotolerant and barophilic species. It is likely that environmentally-relevant HP levels (i.e., above atmospheric) could also modulate the responsiveness to and toxic effects of pollutants in fish...
July 21, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28739105/mountains-to-the-sea-river-study-of-plastic-and-non-plastic-microfiber-pollution-in-the-northeast-usa
#10
Rachael Z Miller, Andrew J R Watts, Brooke O Winslow, Tamara S Galloway, Abigail P W Barrows
Aquatic environments are sinks for anthropogenic contamination, whether chemical or solid pollutants. Microfibers shed from clothing and other textiles contribute to this problem. These can be plastic or non-plastic origin. Our aim was to investigate the presence and distribution of both types of anthropogenic microfibers along the length of the Hudson River, USA. Surface grab samples were collected and filtered through a 0.45μm filter paper. Abundance of fibers was determined after subtraction of potential contamination...
July 21, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28738564/determination-of-iodide-and-total-iodine-in-estuarine-waters-by-cathodic-stripping-voltammetry-using-a-vibrating-silver-amalgam-microwire-electrode
#11
Estrella Espada-Bellido, Zhaoshun Bi, Pascal Salaün, Constant M G van den Berg
Iodide in natural waters is an important nutrient to aquatic organisms and its determination is of relevance to marine aquaculture. For this reason it is of interest to have a simple analytical method for determination of iodide in water samples. Iodide in seawater can be determined electrochemically by cathodic stripping voltammetry (CSV) with a mercury drop electrode which has environmental drawbacks. In an attempt to minimise the use of mercury in voltammetry, a vibrating silver amalgam microwire electrode is used here for the determination by CSV of iodide speciation in natural waters including seawater...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738509/ambient-sediment-quality-conditions-in-minnesota-lakes-usa-effects-of-watershed-parameters-and-aquatic-health-implications
#12
Judy L Crane
Surficial sediments were collected from 50 randomly selected Minnesota lakes, plus four a priori reference lakes, in 2007. The lakes encompassed broad geographic coverage of the state and included a variety of major land uses in the surrounding watersheds. Sediment samples were analyzed for a suite of metals, metalloids, persistent organic pollutants, total organic carbon, and particle size fractions. In addition, a small fish survey was conducted to assess PBDEs in both whole fish and fish tissues. Sediment quality in this set of lakes ranged from good (43%) to moderate (57%) based on an integrative measure of multiple contaminants...
July 18, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28738303/bio-accumulation-of-lanthanum-from-lanthanum-modified-bentonite-treatments-in-lake-restoration
#13
G Waajen, F van Oosterhout, M Lürling
Lanthanum (La) modified bentonite (LMB) is one of the available mitigating agents used for the reduction of the phosphorus (P) recycling in eutrophic lakes. The potential toxicity of the La from LMB to aquatic organisms is a matter of concern. In this study the accumulation of La was investigated in the macrophyte Elodea nuttallii, in chironomid larvae and in several fish species during periods up to five years following in situ LMB applications. The application of LMB increased the La concentration of exposed plants and animals...
July 21, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28738203/early-detection-monitoring-for-aquatic-non-indigenous-species-optimizing-surveillance-incorporating-advanced-technologies-and%C3%A2-identifying-research-needs
#14
REVIEW
Anett S Trebitz, Joel C Hoffman, John A Darling, Erik M Pilgrim, John R Kelly, Emily A Brown, W Lindsay Chadderton, Scott P Egan, Erin K Grey, Syed A Hashsham, Katy E Klymus, Andrew R Mahon, Jeffrey L Ram, Martin T Schultz, Carol A Stepien, James C Schardt
Following decades of ecologic and economic impacts from a growing list of nonindigenous and invasive species, government and management entities are committing to systematic early- detection monitoring (EDM). This has reinvigorated investment in the science underpinning such monitoring, as well as the need to convey that science in practical terms to those tasked with EDM implementation. Using the context of nonindigenous species in the North American Great Lakes, this article summarizes the current scientific tools and knowledge - including limitations, research needs, and likely future developments - relevant to various aspects of planning and conducting comprehensive EDM...
July 21, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28738200/global-distribution-of-dissolved-organic-matter-along-the-aquatic-continuum-across-rivers-lakes-and-oceans
#15
Philippe Massicotte, Eero Asmala, Colin Stedmon, Stiig Markager
Based on an extensive literature survey containing more than 12,000 paired measurements of dissolved organic carbon (DOC) concentrations and absorption of chromophoric dissolved organic matter (CDOM) distributed over four continents and seven oceans, we described the global distribution and transformation of dissolved organic matter (DOM) along the aquatic continuum across rivers and lakes to oceans. A strong log-linear relationship (R(2)=0.92) between DOC concentration and CDOM absorption at 350nm was observed at a global scale, but was found to be ecosystem-dependent at local and regional scales...
July 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28738199/acute-ecotoxicity-of-coated-colloidal-goethite-nanoparticles-on-daphnia-magna-evaluating-the-influence-of-exposure-approaches
#16
V González-Andrés, M Diez-Ortiz, C Delpivo, G Janer, A Fritzsche, S Vázquez-Campos
Synthesized iron oxide nanoparticles have been proposed as an alternative to non-dispersed iron oxides for in situ environmental remediation. Their colloidal properties enable their injection into porous media, i.e. soils and aquifers, and offer a higher efficiency in removing contaminants. However, this dispersed state is also the cause of concerns over their environmental fate and toxicity, e.g., by increasing the exposure time to aquatic organisms in groundwater remediation activities. Therefore, the objective of in situ groundwater remediation is to establish local reactive barriers in the subsurface by injection by means of reactive colloids with a controllable mobility under in situ conditions and present as colloids as shortly as possible...
July 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28738143/sustained-high-nutrient-supply-as-an-allelopathic-trigger-between-periphytic-biofilm-and-microcystis-aeruginosa
#17
Yonghong Wu, Jun Tang, Junzhuo Liu, Bruce Graham, Philip G Kerr, Hong Chen
Allelopathy among aquatic organisms, especially microorganisms, has received growing attention in recent years for its role in shaping interactions with bloom-forming algae. Many studies have shown that allelopathy occurs and increases under nutrient limiting conditons. However, to date there is no reported direct evidence to indicate allelopathy occurs under the condition of constant high nutrient supply. Here we report the allelopathic action of periphytic biofilm on bloom-forming cyanobacteria (Microcystis aeruginosa), which was triggered by the stress of high nutrient conditions, and continues while nutrients are sustained at high levels (trophic state index at 159 and 171)...
July 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28737821/structure-and-reactivity-of-ru-ii-terpy-n-n-cl-cl-complexes-consequences-for-biological-applications
#18
Marta Chrzanowska, Anna Katafias, Olga Impert, Anna Kozakiewicz, Andrzej Surdykowski, Paulina Brzozowska, Alicja Franke, Achim Zahl, Ralph Puchta, Rudi van Eldik
The crystal structures of [Ru(II)(terpy)(bipy)Cl]Cl·2H2O and [Ru(II)(terpy)(en)Cl]Cl·3H2O, where terpy = 2,2':6',2''-terpyridine, bipy = 2,2'-bipyridine and en = ethylenediamine, were determined and compared to the structure of the complexes in solution obtained by multi-nuclear NMR spectroscopy in DMSOd-6 as a solvent. In aqueous solution, both chlorido complexes aquate fully to the corresponding aqua complexes, viz. [Ru(II)(terpy)(bipy)(H2O)](2+) and [Ru(II)(terpy)(en)(H2O)](2+), within ca. 2 h and ca. 2 min at 37 °C, respectively...
July 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28736815/a-widespread-cyanobacterium-supported-by-polyphasic-approach-proposition-of-koinonema-pervagatum-gen-sp-nov-oscillatoriales
#19
Bruna Buch, Mariéllen Dornelles Martins, Luis Henrique Z Branco
Several new genera originally classified as the genus Phormidium, a polyphyletic and taxonomically complex genus within the Oscillatoriales, were recently described. The simple morphology of Phormidium does not reflect its genetic diversity and the delimitation of a natural group is not possible with traditional classification systems based on morphology alone. Therefore, this study used morphological, ecological and molecular approaches to evaluate four populations morphologically similar to Ammassolinea, Kamptonema and Ancylothrix (simple, curved and gradually attenuated at the ends trichome), found in subtropical and tropical Brazilian regions...
July 24, 2017: Journal of Phycology
https://www.readbyqxmd.com/read/28735742/genotoxicity-of-gemfibrozil-in-the-gilthead-seabream-sparus-aurata
#20
A Barreto, L G Luis, A M V M Soares, P Paíga, L H M L M Santos, C Delerue-Matos, K Hylland, S Loureiro, M Oliveira
Widespread use of pharmaceuticals and suboptimal wastewater treatment have led to increased levels of these substances in aquatic ecosystems. Lipid-lowering drugs such as gemfibrozil, which are among the most abundant human pharmaceuticals in the environment, may have deleterious effects on aquatic organisms. We examined the genotoxicity of gemfibrozil in a fish species, the gilthead seabream (Sparus aurata), which is commercially important in southern Europe. Following 96-h waterborne exposure, molecular (erythrocyte DNA strand breaks) and cytogenetic (micronuclei and other nuclear abnormalities in cells) endpoints were measured...
September 2017: Mutation Research
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