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https://www.readbyqxmd.com/read/28930645/spores-and-vegetative-cells-of-phenotypically-and-genetically-diverse-i-bacillus-cereus-sensu-lato-i-are-common-bacteria-in-fresh-water-of-northeastern-poland
#1
Marek Bartoszewicz, Urszula Czyzewska
Gram-positive rods named <i>B. cereus sensu lato</i> (<i>sl</i>), are common in natural habitats and food products. It is believed that they are restricted to spores, however their ecology in aquatic habitats is still poorly investigated. Thus, the aim of the study was to assess the rain-dependent fluctuations of the concentration of <i>B. cereus sl</i> vegetative cells and spores with evaluation of their phylogenetic and population structure in relation to the toxicity and psychrotolerance...
September 20, 2017: Canadian Journal of Microbiology
https://www.readbyqxmd.com/read/28929448/acid-rock-drainage-in-nevado-pastoruri-glacier-area-huascar%C3%A3-n-national-park-per%C3%A3%C2%BA-hydrochemical-and-mineralogical-characterization-and-associated-environmental-implications
#2
Esther Santofimia, Enrique López-Pamo, Edwin Julio Palomino, Elena González-Toril, Ángeles Aguilera
The generation of acid rock drainage (ARD) was observed in an area of Nevado Pastoruri as a result of the oxidative dissolution of pyrite-rich lutites and sandstones. These ARDs are generated as abundant pyrite becomes exposed to atmospheric conditions as a result of glacier retreat. The proglacial zone contains lagoons, springs, streams and wetlands, scant vegetation, and intense fluvioglacial erosion. This work reports a comprehensive identification and the results of sampling of the lagoons and springs belonging to the microbasin, which is the headwaters of the Pachacoto River, as well as mapping results based on the hydrochemical data obtained in our study...
September 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28929288/complex-organic-pollutant-mixtures-originating-from-industrial-and-municipal-emissions-in-surface-waters-of-the-megacity-jakarta-an-example-of-a-water-pollution-problem-in-emerging-economies
#3
Larissa Dsikowitzky, Lukas Hagemann, Dwiyitno, Farida Ariyani, Hari Eko Irianto, Jan Schwarzbauer
During the last decades, the global industrial production partly shifted from industrialized nations to emerging and developing countries. In these upcoming economies, the newly developed industrial centers are generally located in densely populated areas, resulting in the discharge of often only partially treated industrial and municipal wastewaters into the surface waters. There is a huge gap of knowledge about the composition of the complex organic pollutant mixtures occurring in such heavily impacted areas...
September 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28929206/adaptive-management-of-environmental-flows-using-irrigation-infrastructure-to-deliver-environmental-benefits-during-a-large-hypoxic-blackwater-event-in-the-southern-murray-darling-basin-australia
#4
Robyn J Watts, R Keller Kopf, Nicole McCasker, Julia A Howitt, John Conallin, Ian Wooden, Lee Baumgartner
Widespread flooding in south-eastern Australia in 2010 resulted in a hypoxic (low dissolved oxygen, DO) blackwater (high dissolved carbon) event affecting 1800 kilometres of the Murray-Darling Basin. There was concern that prolonged low DO would result in death of aquatic biota. Australian federal and state governments and local stakeholders collaborated to create refuge areas by releasing water with higher DO from irrigation canals via regulating structures (known as 'irrigation canal escapes') into rivers in the Edward-Wakool system...
September 19, 2017: Environmental Management
https://www.readbyqxmd.com/read/28928974/the-influence-of-water-temperature-on-sockeye-salmon-heart-rate-recovery-following-simulated-fisheries-interactions
#5
Tanya S Prystay, Erika J Eliason, Michael J Lawrence, Melissa Dick, Jacob W Brownscombe, David A Patterson, Glenn T Crossin, Scott G Hinch, Steven J Cooke
Selective harvest policies have been implemented in North America to enhance the conservation of Pacific salmon (Oncorhynchus spp.) stocks, which has led to an increase in the capture and release of fish by all fishing sectors. Despite the immediate survival benefits, catch-and-release results in capture stress, particularly at high water temperatures, and this can result in delayed post-release mortality minutes to days later. The objective of this study was to evaluate how different water temperatures influenced heart rate disturbance and recovery of wild sockeye salmon (Oncorhynchus nerka) following fisheries interactions (i...
2017: Conservation Physiology
https://www.readbyqxmd.com/read/28926792/u-isotopes-distribution-in-the-lower-rhone-river-and-its-implication-on-radionuclides-disequilibrium-within-the-decay-series
#6
REVIEW
Mathilde Zebracki, Xavier Cagnat, Stéphanie Gairoard, Nicolas Cariou, Frédérique Eyrolle-Boyer, Béatrice Boulet, Christelle Antonelli
The large rivers are main pathways for the delivery of suspended sediments into coastal environments, affecting the biogeochemical fluxes and the ecosystem functioning. The radionuclides from (238)U and (232)Th-series can be used to understand the dynamic processes affecting both catchment soil erosion and sediment delivery to oceans. Based on annual water discharge the Rhone River represents the largest river of the Mediterranean Sea. The Rhone valley also represents the largest concentration in nuclear power plants in Europe...
September 16, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28923731/phosphorus-sorption-desorption-and-effects-of-temperature-ph-and-salinity-on-phosphorus-sorption-in-marsh-soils-from-coastal-wetlands-with-different-flooding-conditions
#7
Junhong Bai, Xiaofei Ye, Jia Jia, Guangliang Zhang, Qingqing Zhao, Baoshan Cui, Xinhui Liu
Wetland soils act as a sink or source of phosphorus (P) to the overlaying water due to phosphorus sorption-desorption processes. Litter information is available on sorption and desorption behaviors of phosphorus in coastal wetlands with different flooding conditions. Laboratory experiments were conducted to investigate phosphorus sorption-desorption processes, fractions of adsorbed phosphorus, and the effects of salinity, pH and temperature on phosphorus sorption on soils in tidal-flooding wetlands (TW), freshwater-flooding wetlands (FW) and seasonal-flooding wetlands (SW) in the Yellow River Delta...
August 24, 2017: Chemosphere
https://www.readbyqxmd.com/read/28923580/30-years-of-data-reveal-dramatic-increase-in-abundance-of-brown-trout-following-the-removal-of-a-small-hydrodam
#8
Kim Birnie-Gauvin, Martin H Larsen, Jan Nielsen, Kim Aarestrup
Humans and freshwater ecosystems have a long history of cohabitation. Today, nearly all major rivers of the world have an in-stream structure which changes water flow, substrate composition, vegetation, and fish assemblage composition. The realization of these effects and their subsequent impacts on population sustainability and conservation has led to a collective effort aimed to find ways to mitigate these impacts. Barrier removal has recently received greater interest as a potential solution to restore river connectivity, and reestablish high quality habitats, suitable for feeding, refuge and spawning of fish...
September 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28923577/quality-index-of-the-surface-water-of-amazonian-rivers-in-industrial-areas-in-par%C3%A3-brazil
#9
Adaelson Campelo Medeiros, Kleber Raimundo Freitas Faial, Kelson do Carmo Freitas Faial, Iris Danielly da Silva Lopes, Marcelo de Oliveira Lima, Raphael Mendonça Guimarães, Neyson Martins Mendonça
In this study was to evaluate the waters quality of the Murucupi River, located in urban agglomerate area and intense industrial activity in Barcarena City, Pará State. The Arapiranga River in Abaetetuba City was used as control area (Background), next to Barcarena. Was used the Water Quality Index (WQI) based on nine variables analized. Waters quality of the Arapiranga and Murucupi rivers were regular to good and bad to good, respectively. Anthropogenic influence on the Murucupi River was higher, mainly by the disposal of domestic effluents from the urban agglomerate and of the industrial waste tailing basins upstream of this river...
September 15, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28923406/negative-environmental-impacts-of-antibiotic-contaminated-effluents-from-pharmaceutical-industries
#10
Ana Bielen, Ana Šimatović, Josipa Kosić-Vukšić, Ivan Senta, Marijan Ahel, Sanja Babić, Tamara Jurina, Juan José González Plaza, Milena Milaković, Nikolina Udiković-Kolić
Effluents from pharmaceutical industries are recognized as significant contributors to aquatic pollution with antibiotics. Although such pollution has been mostly reported in Asia, knowledge on industrial discharges in other regions of the world, including Europe, and on the effects associated with such exposures is still limited. Thus, we performed chemical, microbiological and ecotoxicological analyses of effluents from two Croatian pharmaceutical industries during four seasons. In treated effluents of the company synthesizing macrolide antibiotic azithromycin (AZI), the total concentration of AZI and two macrolide by-products from its synthesis was 1-3 orders of magnitude higher in winter and springtime (up to 10...
September 9, 2017: Water Research
https://www.readbyqxmd.com/read/28922515/increased-resource-use-efficiency-amplifies-positive-response-of-aquatic-primary-production-to-experimental-warming
#11
James M Hood, Jonathan P Benstead, Wyatt F Cross, Alexander D Huryn, Philip W Johnson, Gísli M Gíslason, James R Junker, Daniel Nelson, Jón S Ólafsson, Chau Tran
Climate warming is affecting the structure and function of river ecosystems, including their role in transforming and transporting carbon (C), nitrogen (N), and phosphorus (P). Predicting how river ecosystems respond to warming has been hindered by a dearth of information about how otherwise well-studied physiological responses to temperature scale from organismal to ecosystem levels. We conducted an ecosystem-level temperature manipulation to quantify how coupling of stream ecosystem metabolism and nutrient uptake responded to a realistic warming scenario...
September 18, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28920171/an-investigation-of-the-host-specificity-of-metacercariae-of-species-of-apophallus-digenea-heterophyidae-in-freshwater-fishes-using-morphological-experimental-and-molecular-methods
#12
Diána Sándor, Kálmán Molnár, David I Gibson, Csaba Székely, Gábor Majoros, Gábor Cech
Metacercariae of species of the genus Apophallus Lühe, 1909, infecting the fins and skin of freshwater fishes, frequently cause black spot disease. Two species, Apophallus muehlingi (Jägerskiöld, 1899) and A. donicus (Skrjabin & Lindtrop, 1919), are known to occur in Hungarian fishes. It has generally been thought that metacercariae of A. muehlingi infect cyprinid fishes, whereas those of A. donicus develop in percids. As part of a morphological, experimental and molecular study, metacercariae were collected from 99 infected specimens of five cyprinid hosts (Abramis brama, Blicca bjoerkna, Chondrostoma nasus, Squalius cephalus, Scardinius erythrophthalmus) and 18 infected specimens of two percid hosts (Gymnocephalus cernua, Perca fluviatilis) in Hungarian natural waters (Lake Balaton, River Danube)...
September 17, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28918639/identification-of-novel-hydrogen-substituted-polyfluoroalkyl-ether-sulfonates-in-environmental-matrices-near-metal-plating-facilities
#13
Yongfeng Lin, Ting Ruan, Aifeng Liu, Guibin Jiang
Environmental occurrence and behaviors of 6:2 chlorinated polyfluoroalkyl ether sulfonate (Cl-6:2 PFESA, with trade name F-53B) have been received increasing attention recently. Nevertheless, its potential fates under diversified conditions remain concealed. In this study, susceptibility of Cl-6:2 PFESA to reductive dehalogenation was tested in an anaerobic super-reduced cyanocobalamin assay. A rapid transformation of dosed Cl-6:2 PFESA was observed, with a hydrogen-substituted polyfluoroalkyl ether sulfonate (1H-6:2 PFESA) identified as the predominant product by a non-target screening workflow...
September 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28918635/optimization-of-the-determination-method-for-dissolved-cyanobacterial-toxin-bmaa-in-natural-water
#14
Boyin Yan, Zhiquan Liu, Rui Huang, Yongpeng Xu, Dongmei Liu, Tsair-Fuh Lin, Fuyi Cui
There is a serious dispute on the existence of β-N-methylamino-L-alanine (BMAA) in water, which is a neurotoxin that may cause Amyotrophic lateral sclerosis/Parkinson's disease (ALS/PDC) and Alzheimer' disease. It is believed that a reliable and sensitive analytical method for the determination of BMAA is urgently required to resolve this dispute. In the present study, the solid phase extraction (SPE) procedure and the analytical method for dissolved BMAA in water were investigated and optimized. The results showed both derivatized and underivatized methods were qualified for the measurement of BMAA and its isomer in natural water, and the limit of detection and the precision of the two methods were comparable...
September 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28918336/total-and-cytosolic-concentrations-of-twenty-metals-metalloids-in-the-liver-of-brown-trout-salmo-trutta-linnaeus-1758-from-the-karstic-croatian-river-krka
#15
Zrinka Dragun, Vlatka Filipović Marijić, Nesrete Krasnići, Dušica Ivanković, Damir Valić, Jakov Žunić, Damir Kapetanović, Irena Vardić Smrzlić, Zuzana Redžović, Ivana Grgić, Marijana Erk
Total and cytosolic concentrations of twenty metals/metalloids in the liver of brown trout Salmo trutta (Linnaeus, 1758) were studied in the period from April 2015 to May 2016 at two sampling sites on Croatian river Krka, to establish if river water contamination with metals/metalloids downstream of Knin town has influenced metal bioaccumulation in S. trutta liver. Differences were observed between two sites, with higher concentrations of several elements (Ag, As, Ca, Co, Na, Se, Sr, V) found downstream of Knin town, whereas few others (Cd, Cs, Mo, Tl) were, unexpectedly, increased at the Krka River spring...
September 14, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28918279/seasonal-variation-of-chloro-s-triazines-in-the-hartbeespoort-dam-catchment-south-africa
#16
Cornelius Rimayi, David Odusanya, Jana M Weiss, Jacob de Boer, Luke Chimuka
Seasonal variation of eight chloro-s-triazine herbicides and seven major atrazine and terbuthylazine degradation products was monitored in the Hartbeespoort Dam catchment using gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-mass spectrometry (LC-MS/MS). Lake, river and groundwater were sampled from the Hartbeespoort Dam catchment over four seasons and the downstream Jukskei River was monitored during the winter season. Triazine herbicide concentrations in the Hartbeespoort Dam were in the order atrazine>simazine>propazine>ametryn>prometryn throughout the four seasons sampled...
September 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28917800/%C3%AE-cyclodextrins-incorporated-multi-walled-carbon-nanotubes-modified-electrode-for-the-voltammetric-determination-of-the-pesticide-dichlorophen
#17
Karolina Sipa, Mariola Brycht, Andrzej Leniart, Paweł Urbaniak, Agnieszka Nosal-Wiercińska, Bartłomiej Pałecz, Sławomira Skrzypek
In this work, a glassy carbon electrode modified with β-cyclodextrins and multi-walled carbon nanotubes (β-CDs/MWCNTs/GCE) was constructed and applied for the square-wave adsorptive stripping voltammetric (SWAdSV) determination of the pesticide dichlorophen (Dcp). For the first time, this compound was electrochemically investigated. The voltammetric measurements were conducted in phosphate buffer (PBS) at pH 6.5 as a supporting electrolyte, and SWAdSV technique parameters were optimized. A linear calibration curve in the wide concentration range from 5...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917764/coupling-dispersive-liquid-liquid-microextraction-to-inductively-coupled-plasma-atomic-emission-spectrometry-an-oxymoron
#18
David Martínez, Daniel Torregrosa, Guillermo Grindlay, Luis Gras, Juan Mora
Coupling dispersive liquid-liquid micro-extraction (DLLME) to inductively coupled plasma atomic emission spectrometry (ICP-AES) is usually troublesome due to the limited plasma tolerance to the organic solvents usually employed for metal extraction. This work explores different coupling strategies allowing the multi-element determination by ICP-AES of the solutions obtained after DLLME procedures. To this end, three of the most common extractant solvents in DLLME procedures (1-undecanol, 1-butyl-3-methyl-imidazolium hexafluorophosphate and chloroform) have been selected to face most of the main problems reported in DLLME-ICP-AES coupling (i...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917749/trace-determination-of-volatile-polycyclic-aromatic-hydrocarbons-in-natural-waters-by-magnetic-ionic-liquid-based-stir-bar-dispersive-liquid-microextraction
#19
Juan L Benedé, Jared L Anderson, Alberto Chisvert
In this work, a novel hybrid approach called stir bar dispersive liquid microextraction (SBDLME) that combines the advantages of stir bar sorptive extraction (SBSE) and dispersive liquid-liquid microextraction (DLLME) has been employed for the accurate and sensitive determination of ten polycyclic aromatic hydrocarbons (PAHs) in natural water samples. The extraction is carried out using a neodymium stir bar magnetically coated with a magnetic ionic liquid (MIL) as extraction device, in such a way that the MIL is dispersed into the solution at high stirring rates...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917735/trace-analysis-of-nitrite-ions-in-environmental-samples-by-using-in-situ-synthesized-zein-biopolymeric-nanoparticles-as-the-novel-green-solid-phase-extractor
#20
Amir Hatamie, Mahmoud Nassiri, Meghdad Doust Alivand, Amit Bhatnagar
For the first time, a novel green method using Zein biopolymeric nanoparticles as a green dispersive solid-phase extractor is reported for the separation and preconcentration of trace amount of nitrite (NO2(-)) ions in ppb levels. The Zein protein is a biodegradable hydrophobic plant protein that is obtained from corn and is composed of a number of hydrophobic amino acids. Zein bionanoparticles were synthesized in an anti-solvent process and used as a new biosorbent in the extraction technique. In the proposed technique, by using a standard method at first, a mixture of 1-naphthylamine and sulphanilic acid as selective regents was added to the samples, and in the presence of the nitrite ion, a red azo product was formed...
January 1, 2018: Talanta
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