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Anding Li, Yan Zhang, Beihai Zhou, Kailing Xin, Yingnan Gu, Weijie Xu, Jie Tian
The molecular weight of dissolved organic matter (DOM) is one of the essential factors controlling the properties of metal complexes. A continuous ultrafiltration experiment was designed to study the properties of Cu complexes with different molecular weights in a river before and after eutrophication. The results showed that the concentration of DOM increased from 26.47 to 38.20 mg/L during the eutrophication process, however, DOM was still dominated by the small molecular weight fraction before and after eutrophication...
May 21, 2018: Bulletin of Environmental Contamination and Toxicology
Dominik Göbel, Nils Clamor, Boris J Nachtsheim
A highly regioselective functionalization of 7-bromofluorene-2-carbaldehydes, potent organic chromophores, in position C3 using a mild ortho-metallation strategy (DoM) with TMPMgCl·LiCl has been developed. This approach allows the preparation of highly functionalized fluorene derivatives by conversion of the in situ generated metalated species with various electrophiles giving a fast access to novel organic phosphorescent dyes.
May 22, 2018: Organic & Biomolecular Chemistry
Vera Kovacevic, André J Simpson, Myrna J Simpson
Organophosphate esters (OPEs) are frequently detected in aquatic environments. Hydrophobic OPEs with high octanol-water partition coefficients (Log KOW ) will likely sorb to dissolved organic matter (DOM) and consequently alter OPE bioavailability and sub-lethal toxicity. ¹H nuclear magnetic resonance (NMR)-based metabolomics was used to evaluate how DOM (5 mg organic carbon/L) alters the metabolic response of Daphnia magna exposed to sub-lethal concentrations of three individual OPEs with varying hydrophobicity...
May 19, 2018: Metabolites
Michael R Brooker, Krista Longnecker, Elizabeth B Kujawinski, Mary Evert, Paula J Mouser
Phosphorus loads are strongly associated with the severity of harmful algal blooms in Lake Erie, a Great Lake with shared boundaries in the United States and Canada. The annual phosphorus loads are predominantly supplied from agricultural sources. Inorganic and total phosphorus measurements have historically been used to estimate nonpoint and point source contributions, with organic phosphorus often neglected. Here, we used ultrahigh resolution mass spectrometry to characterize the dissolved organic matter (DOM) and specifically dissolved organic phosphorus (DOP) composition of several nutrient pollutant source materials and aqueous samples in a Lake Erie tributary...
May 21, 2018: Environmental Science & Technology
Mark Waldron, Cameron Ralph, Owen Jeffries, Jamie Tallent, Nicola Theis, Stephen David Patterson
This study investigated the effects of leucine or leucine + glutamine supplementation on recovery from eccentric exercise. In a double-blind independent groups design, 23 men were randomly assigned to a leucine (0.087 g/kg; n = 8), leucine + glutamine (0.087 g/kg + glutamine 0.3 g/kg; n = 8) or placebo (0.3 g/kg maltodextrin; n = 7) group. Participants performed 5 sets of drop jumps, with each set comprising 20 repetitions. Isometric knee-extensor strength, counter-movement jump (CMJ) height, delayed-onset muscle soreness (DOMS) and creatine kinase (CK) were measured at baseline, 1, 24, 48 h and 72 h post-exercise...
May 16, 2018: Amino Acids
H J Smith, M Dieser, D M McKnight, M D SanClements, C M Foreman
Vast expanses of Earth's surface are covered by ice, with microorganisms in these systems affecting local and global biogeochemical cycles. We examined microbial assemblages from habitats fed by glacial meltwater within the McMurdo Dry Valleys, Antarctica, and on the west Greenland Ice Sheet, (GrIS) evaluating potential physicochemical factors explaining trends in community structure. Microbial assemblages present in the different Antarctic dry valley habitats were dominated by Sphingobacteria and Flavobacteria, while Gammaproteobacteria and Sphingobacteria prevailed in west GrIS supraglacial environments...
May 14, 2018: FEMS Microbiology Ecology
Seyong Lee, Younghee Roh, Kyoung-Woong Kim
Mercuric species, Hg(II), interacts strongly with dissolved organic matter (DOM) through the oxidation, reduction, and complexation that affect the fate, bioavailability, and cycling of mercury, Hg, in aquatic environments. Despite its importance, the reactions between Hg(II) and DOM have rarely been studied in the presence of different concentrations of chloride ions (Cl- ) under anoxic conditions. Here, we report that the extent of Hg(II) reduction in the presence of the reduced DOM decreases with increasing Cl- concentrations...
May 14, 2018: Environmental Geochemistry and Health
Olivier Dupuy, Wafa Douzi, Dimitri Theurot, Laurent Bosquet, Benoit Dugué
Introduction: The aim of the present work was to perform a meta-analysis evaluating the impact of recovery techniques on delayed onset muscle soreness (DOMS), perceived fatigue, muscle damage, and inflammatory markers after physical exercise. Method: Three databases including PubMed, Embase , and Web-of-Science were searched using the following terms: ("recovery" or "active recovery" or "cooling" or "massage" or "compression garment" or "electrostimulation" or "stretching" or "immersion" or "cryotherapy") and ("DOMS" or "perceived fatigue" or "CK" or "CRP" or "IL-6") and ("after exercise" or "post-exercise") for randomized controlled trials, crossover trials, and repeated-measure studies...
2018: Frontiers in Physiology
Harshad V Kulkarni, Natalie Mladenov, Saugata Datta, Debashis Chatterjee
Arsenic (As) mobilization in the Bengal Basin aquifers has been studied for several decades due to the complex redox bio-geochemistry, dynamic hydrogeology and complex nature of dissolved organic matter (DOM). Earlier studies have examined the changes in groundwater As in the dry season before monsoon and during the wet season after monsoonal recharge. To investigate the more immediate influence of recharge during the active monsoon period on As mobilization and DOM character, groundwater samples were analyzed in the pre-monsoon and during the active monsoon period...
May 10, 2018: Science of the Total Environment
Weiqin Zhu, Wu Yao, Xuyang Shen, Weiwen Zhang, Huiting Xu
In this work, a mixture of pig manure and 13 C-labeled rice straw was vermicomposted with Eisenia fetida for 40 days. The results showed that after they acclimated to the vermicomposting environment, the earthworms helped to degrade the substrate residues. After 40 days, the vermicomposting led to much higher pH, EC, C/N, available K, available P, available Zn, and CEC values but much lower available N and available Cu values in the substrate residues compared to the initial values. The earthworms accumulated 13 C, Cu, and Zn with a heavy metal enrichment capacity in the order of Cu > Zn...
May 10, 2018: Environmental Science and Pollution Research International
Anthony Lynn, Samantha Garner, Nichola Nelson, Trevor N Simper, Anna C Hall, Mayur K Ranchordas
Background: Emerging evidence indicates that fruits rich in polyphenols may attenuate exercise-induced muscle damage and associated markers of inflammation and soreness. This study was conducted to determine whether bilberry juice (BJ), which is particularly rich in polyphenols, reduces markers of muscle damage in runners completing a half marathon. Methods: A total of 21 recreationally trained runners (age 30.9 ± 10.4 y; mass 71.6 ± 11.0 kg; M = 16; F = 5) were recruited to a single blind, randomised, placebo-controlled, parallel study...
2018: Journal of the International Society of Sports Nutrition
Shuran He, Yongtao Li, Liping Weng, Jinjin Wang, Jinxian He, Yonglin Liu, Kun Zhang, Qihong Wu, Yulong Zhang, Zhen Zhang
In present study, the feasibility of applying a natural adsorbent with Fe3+ modification (Fe3+ -modified argillaceous limestone, FAL) on the competitive adsorption of heavy metals (i.e., Cd2+ , Pb2+ and Ni2+ ) was evaluated. The current results revealed an efficient adsorption on Cd2+ , Pb2+ and Ni2+ in mono-metal system. Further experiments demonstrated a high selectivity of Pb2+ during the competitive adsorption of Cd2+ , Pb2+ and Ni2+ . The adsorption selectivity of the metal ions followed the order of Pb ≫ Cd > Ni...
May 6, 2018: Science of the Total Environment
Erik Bannert, Tanja Tesch, Jeannette Kluess, Janine Winkler, Jana Frahm, Susanne Kersten, Stefan Kahlert, Lydia Renner, Hermann-Josef Rothkötter, Sven Dänicke
The aim of this study was to investigate the potential modulatory effect of E. coli lipopolysaccharides (LPS) on residues of deoxynivalenol (DON), de-epoxy-deoxynivalenol (DOM-1), zearalenone (ZEN) and its metabolites α-zearalenol (α-ZEL), β-zearalenol (β-ZEL), zearalanone (ZAN), α-zearalanol (α-ZAL) and β-zearalanol (β-ZAL) after pre- or post-hepatic administration along the gastrointestinal axis. Fifteen barrows were exposed to a naturally mycotoxin contaminated diet (4.59 mg DON/kg feed and 0.22 mg ZEN/kg feed) and equipped with jugular (ju) and portal (po) catheters...
June 2018: Archives of Animal Nutrition
Nicole Sani-Kast, Patrick Ollivier, Danielle Slomberg, Jérôme Labille, Konrad Hungerbühler, Martin Scheringer
To assess the environmental fate of engineered nanoparticles (ENPs), it is essential to understand their interactions with dissolved organic matter (DOM). The highly complex nature of the interactions between DOM and ENPs and other particulate matter (PM) requires investigating a wide range of material types under different conditions. However, despite repeated calls for an increased diversity of the DOM and PM studied, researchers increasingly focus on certain subsets of DOM and PM. Considering the discrepancy between the calls for more diversity and the research actually carried out, we hypothesize that materials that were studied more often are more visible in the scientific literature and therefore are more likely to be studied again...
2018: PloS One
Yan Zhu, Yousef I Hassan, Suqin Shao, Ting Zhou
Deoxynivalenol (DON) is a type B trichothecene mycotoxin that is commonly detected in grains infested with Fusarium species. The maximum tolerated levels of DON in the majority of world's countries are restricted to 0.75 mg kg-1 within the human food chain and to less than 1-5 mg kg-1 in animal feed depending on the feed material and/or animal species due to DON's short and long-term adverse effects on human health and animal productivity. The ability to accurately analyze DON and some of its fungal/bacterial metabolites is increasingly gaining a paramount importance in food/feed analysis and research...
May 1, 2018: Journal of Chromatography. A
Baile Xu, Fei Liu, Philip C Brookes, Jianming Xu
Microplastics have a great potential to sorb organic pollutants from the adjacent environment. In this study, the sorption of tetracycline, a polar and ionizable antibiotic, on three types of microplastics (polyethylene (PE), polypropylene (PP) and polystyrene (PS)) were investigated in batch sorption experiments. The sorption isotherms were well fitted by the Langmuir model, indicating that not only hydrophobic interactions but also other interactions (e.g. electrostatic interactions) played important roles in the sorption process...
May 2, 2018: Environmental Pollution
Wei Wu, Hongjie Sheng, Chenggang Gu, Yang Song, Sabine Willbold, Yan Qiao, Guangxia Liu, Wei Zhao, Yu Wang, Xin Jiang, Fang Wang
The widespread use of plastic film, especially in agricultural practices, has resulted in phthalic acid esters (PAEs) pollution, which poses risks for greenhouse soils. Application of composted manure is a common agricultural practice that adds extraneous dissolved organic matter (DOM) to the soil, however, the effect of extraneous DOM on the behavior of PAEs in agricultural soil is not clear. Dibutyl phthalate (DBP) was used as a model compound to investigate the effect and mechanism of extraneous DOM on the adsorption kinetics and isotherms of PAEs in two types of soils, through batch experiments and characterization of extraneous DOM and soils using fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR)...
August 1, 2018: Science of the Total Environment
Pablo Lodeiro, Eric P Achterberg, Carlos Rey-Castro, Mohammad S El-Shahawi
The aggregation behaviour of polymer-coated silver nanoparticles (AgNPs) was characterized in NaCl solutions, and in two seawaters of different salinities and dissolved organic matter (DOM) contents. Representative organic coatings i.e. tannic acid (TA), alginic acid (ALG), two gum Arabic samples (GAL and GAH), branched polyethylenimine (BPEI), and non-ionic surfactants (reference material NM-300K) were selected to cover a wide range of zeta-potentials. The stability in NaCl solutions, as determined from the rate of variation in hydrodynamic size within a timeframe of one hour, followed the order BPEI≫NM-300K≈GAL≫ALG≈TA≫GAH...
August 1, 2018: Science of the Total Environment
Linjian Ou, Xiaohong Liu, Jingjing Li, Xianling Qin, Lei Cui, Songhui Lu
Brown tides of Aureococcus anophagefferens have occurred annually in the coastal waters of Qinhuangdao since 2009. High levels of dissolved organic matter (DOM) are always measured during bloom periods. Study focusing on the effect of DOM on the occurrences of brown tides in this area is scare by far. To analyze the efficiency of DOM hydrolysis by different groups of microorganisms and the possible influence of DOM on the formation of brown tides, extracellular enzymes such as α, β-glucosidases (α, β-GLUs), leucine aminopeptidase (LAP) and alkaline phosphatase (AP) as well as other environmental parameters were analyzed during a pre-bloom period of A...
April 2018: Harmful Algae
Ana Serra Silva, Maria Pitta Groz, Paula Leandro, Carlos A Assis, Rui Figueira
The collection of the Museu Oceanográfico D. Carlos I is a historical specimen, instrument, and document collection that has been housed at the Aquário Vasco da Gama since 1935. The collection is largely the result of several scientific campaigns conducted by Dom Carlos de Bragança between 1896 and 1907. Specifically, the ichthyological collection consists of 675 surviving catalogue records of specimens caught, acquired or offered to D. Carlos I between 1892 to 1907, and includes the type specimen for Odontaspis nasutus Bragança, 1904 (junior synonym of Mitsukurina owstoni Jordan, 1898), along with several specimens of deep sea species...
2018: ZooKeys
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