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https://www.readbyqxmd.com/read/28229949/predicting-reactivity-of-model-dom-compounds-towards-chlorine-with-mediated-electrochemical-oxidation
#1
Glen Andrew de Vera, Wolfgang Gernjak, Jelena Radjenovic
Chlorine demand of a water sample depends on the characteristics of dissolved organic matter (DOM). It is an important parameter for water utilities used to assess oxidant and/or disinfectant consumption of source waters during treatment and distribution. In this study, model compounds namely resorcinol, tannic acid, vanillin, cysteine, tyrosine, and tryptophan were used to represent the reactive moieties of complex DOM mixtures. The reactivity of these compounds was evaluated in terms of Cl2 demand and electron donating capacity (EDC)...
January 23, 2017: Water Research
https://www.readbyqxmd.com/read/28227308/analyzing-the-influence-of-curl-speed-in-fatiguing-biceps-brachii-muscles-using-semg-signals-and-multifractal-detrended-moving-average-algorithm
#2
Kiran Marri, Ramakrishnan Swaminathan, Kiran Marri, Ramakrishnan Swaminathan, Kiuuwncran Marri, Ramakrishnan Swaminathan
In this work, an attempt has been made to analyze surface electromyography (sEMG) signals of fatiguing biceps brachii muscles at different curl speeds using multifractal detrended moving average (MFDMA) algorithm. For this purpose, signals are recorded from fifty eight healthy subjects while performing curl exercise at their comfortable speed until fatigue. The signals of first and last curls are considered as nonfatigue and fatigue conditions, respectively. Further, the number of curls performed by each subject and the endurance time is used for computing the normalized curl speed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28223482/a-network-perspective-reveals-decreasing-material-diversity-in-studies-on-nanoparticle-interactions-with-dissolved-organic-matter
#3
Nicole Sani-Kast, Jérôme Labille, Patrick Ollivier, Danielle Slomberg, Konrad Hungerbühler, Martin Scheringer
Dissolved organic matter (DOM) strongly influences the properties and fate of engineered nanoparticles (ENPs) in aquatic environments. There is an extensive body of experiments on interactions between DOM and ENPs and also larger particles. [We denote particles on the nano- and micrometer scale as particulate matter (PM).] However, the experimental results are very heterogeneous, and a general mechanistic understanding of DOM-PM interactions is still missing. In this situation, recent reviews have called to expand the range of DOM and ENPs studied...
February 21, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28222865/simulated-oil-release-from-oil-contaminated-marine-sediment-in-the-bohai-sea-china
#4
Lingling Yuan, Longxi Han, Wenjie Bo, Hua Chen, Wenshen Gao, Bo Chen
There is a high degree of heavy oil partitioning into marine sediments when an oil spill occurs. Contaminated sediment, as an endogenous pollution source, can re-pollute overlying water slowly. In this study, a static oil release process and its effects in marine sediment was investigated through a series of experiments with reproductive heavy oil-contaminated marine sediment. The oil release process was accurately simulated with a Lagergren first-order equation and reached equilibration after 48h. The fitted curve for equilibrium concentration (C0) and first-order rate constant (k1) for sediment pollution levels exhibited a first-order log relationship...
February 17, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28219468/in-situ-and-in-vitro-ruminal-starch-degradation-of-grains-from-different-rye-triticale-and-barley-genotypes
#5
J Krieg, N Seifried, H Steingass, M Rodehutscord
In recent years, advances in plant breeding were achieved, which potentially led to modified nutritional values of cereal grains. The present study was conducted in order to obtain a broad overview of ruminal digestion kinetics of rye, triticale and barley grains, and to highlight differences between the grain species. In total, 20 genotypes of each grain species were investigated using in situ and in vitro methods. Samples were ground (2 mm), weighed into polyester bags, and incubated in situ 1 to 48 h in three ruminally cannulated lactating dairy cows...
February 21, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28218520/alteration-of-the-copper-binding-capacity-of-iron-rich-humic-colloids-during-transport-from-peatland-to-marine-waters
#6
Francois Muller, Marco Cuscov
Blanket bogs contain vast amounts of Sphagnum-derived organic substances which can act as powerful chelators for dissolved iron and thus enhance its export to the coastal ocean. To investigate the variations in quantity and quality of these exports, adsorptive cathodic stripping voltammetry (CSV) was used to characterise the metal binding properties of molecular weight-fractionated dissolved organic matter (MW-fractionated DOM) in the catchment and coastal plume of a small peat-draining river over a seasonal cycle...
February 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28217926/reduction-oxidation-cycles-of-organic-matter-increase-bacterial-activity-in-the-pelagic-oxycline
#7
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/28217029/typographical-errors-in-article-entitled-unusual-false-positive-radioiodine-uptake-on-131-i-whole-body-scintigraphy-in-three-unrelated-organs-with-different-pathologies-in-patients-of-differentiated-thyroid-carcinoma-a-case-series
#8
https://www.readbyqxmd.com/read/28215801/differences-in-dom-of-rewetted-and-natural-peatlands-results-from-high-field-ft-icr-ms-and-bulk-optical-parameters
#9
Peter Herzsprung, Katja Osterloh, Wolf von Tümpling, Mourad Harir, Norbert Hertkorn, Philippe Schmitt-Kopplin, Ralph Meissner, Sabine Bernsdorf, Kurt Friese
Peatlands can be a potential source of dissolved organic matter (DOM) in fresh water catchment areas. The quantity and quality of DOM can differ between pristine, degraded and rewetted peatlands. Due to the large scale and continuing losses of peatlands, their conservation and restoration has been increasingly emphasized. Mostly rewetting measures are required to improve the hydrology of damaged peatlands, which is a precondition for the resettlement of peat-forming plant species. Thus, in term of DOM, there is a special need to understand how rewetting measures affect DOM characteristics and concentrations...
February 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28214421/effects-of-molecular-size-fraction-of-dom-on-photodegradation-of-aqueous-methylmercury
#10
Moon-Kyung Kim, A-Young Won, Kyung-Duk Zoh
This study investigated the photodegradation kinetics of MeHg in the presence of various size fractions of dissolved organic matter (DOM) with MW < 3.5 kDa, 3.5 < MW < 10 kDa, and MW > 10 kDa. The DOM fraction with MW < 3.5 kDa was most effective in MeHg photodegradation. Increasing UV intensity resulted in the increase of photodegradation rate of the MeHg in all size of DOM fractions. Higher rates of MeHg degradation was observed at higher pH. For the portion of MW < 3.5 kDa, the photodegradation rate of MeHg increased with increasing DOM concentration, indicating that radicals such as singlet oxygen ((1)O2) radicals can be effectively produced by DOM...
February 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28213336/linking-the-mobilization-of-dissolved-organic-matter-in-catchments-and-its-removal-in-drinking-water-treatment-to-its-molecular-characteristics
#11
Julia Raeke, Oliver J Lechtenfeld, Jörg Tittel, Marieke R Oosterwoud, Katrin Bornmann, Thorsten Reemtsma
Drinking water reservoirs in the Northern Hemisphere are largely affected by the decadal-long increase in riverine dissolved organic carbon (DOC) concentrations. The removal of DOC in drinking water treatment is costly and predictions are needed to link DOC removal efficiency to its mobilization in catchments, both of which are determined by the molecular composition. To study the effect of hydrological events and land use on the molecular characteristics of dissolved organic matter (DOM), 36 samples from three different catchment areas in the German low mountain ranges, with DOC concentrations ranging from 3 to 32 mg L(-1), were examined...
February 8, 2017: Water Research
https://www.readbyqxmd.com/read/28208799/microbial-detoxification-of-deoxynivalenol-don-assessed-via-a-lemna-minor-l-bioassay-through-biotransformation-to-3-epi-don-and-3-epi-dom-1
#12
Ilse Vanhoutte, Laura De Mets, Marthe De Boevre, Valdet Uka, José Diana Di Mavungu, Sarah De Saeger, Leen De Gelder, Kris Audenaert
Mycotoxins are toxic metabolites produced by fungi. To mitigate mycotoxins in food or feed, biotransformation is an emerging technology in which microorganisms degrade toxins into non-toxic metabolites. To monitor deoxynivalenol (DON) biotransformation, analytical tools such as ELISA and liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) are typically used. However, these techniques do not give a decisive answer about the remaining toxicity of possible biotransformation products. Hence, a bioassay using Lemna minor L...
February 13, 2017: Toxins
https://www.readbyqxmd.com/read/28206858/genetic-polymorphism-of-aedes-albopictus-population-inferred-from-nd5-gene-variabilities-in-subang-jaya-malaysia
#13
Nurul Adilah-Amrannudin, Mayamin Hamsidi, Nurul-Ain Ismail, Rodziah Ismail, Nazri Che Dom, Abu Hassan Ahmad, Mohd Fahmi Mastuki, Tengku Shahrul Anuar Tengku Ahmad Basri, Adira Khalid, Mohammad Muslim, Nurul Amalina Ahmad Daud, Siti Nazrina Camalxaman
This study was performed to establish the genetic variability of Aedes albopictus within Subang Jaya, Selangor, Malaysia, by using the nicotinamide adenine dinucleotide dehydrogenase 5 subunit (ND5) mitochondrial DNA (mtDNA) marker. A total of 90 samples were collected from 9 localities within an area of the Subang Jaya Municipality. Genetic variability was determined through the amplification and sequencing of a fragment of the ND5 gene. Eight distinct mtDNA haplotypes were identified. The evolutionary relationship of the local haplotypes alongside 28 reference strains was used to construct a phylogram, the analysis of which revealed low genetic differentiation in terms of both nucleotide and haplotype diversity...
December 2016: Journal of the American Mosquito Control Association
https://www.readbyqxmd.com/read/28206742/influence-of-the-mixing-energy-consumption-affecting-coagulation-and-floc-aggregation
#14
Yamuna Srinivasan Vadasarukkai, Graham A Gagnon
The operational significance of energy-intensive rapid mixing processes remains unaddressed in coagulation and flocculation of insoluble precipitates (flocs), which play an important role in the removal of impurities from drinking water supplies. In this study, the influence of rapid mixing and associated mixing energy on floc aggregation was examined for a surface water source characterized by a high fraction of aquatic humic matter. Infrared spectral analyses showed that the colloidal complexes resulting from ligand exchange between iron and dissolved natural organic matter (DOM) were not substantially influenced by the mixing energy input...
February 16, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28197941/properties-and-evolution-of-dissolved-organic-matter-during-co-composting-of-dairy-manure-and-chinese-herbal-residues
#15
Qunliang Li, Yanyu Lu, Xiaobo Guo, Guangchun Shan, Junhao Huang
Composting is an effective method in treating solid organic wastes, in which dissolved organic matter (DOM) plays an important role in transformation of organic matter and microbial activity. Therefore, an understanding of the properties and evolution of DOM during composting is crucial. In this study, DOM was studied using elemental analysis, spectroscopic analysis (UV-vis, FTIR, and pyrolysis-GC/MS), and colloidal analysis during a 120-day composting. Results showed that the content of N and O in DOM increased while C and H content declined progressively over the composting time...
February 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28193352/a-straightforward-validated-liquid-chromatography-coupled-to-tandem-mass-spectrometry-method-for-the-simultaneous-detection-of-nine-drugs-of-abuse-and-their-metabolites-in-hair-and-nails
#16
Delphine Cappelle, Mireille De Doncker, Celine Gys, Kamelia Krysiak, Steven De Keukeleire, Walid Maho, Cleo L Crunelle, Geert Dom, Adrian Covaci, Alexander L N van Nuijs, Hugo Neels
Hair and nails allow for a stable accumulation of compounds over time and retrospective investigation of past exposure and/or consumption. Owing to their long window of detection (weeks to months), analysis of these matrices can provide information complementary to blood and urine analysis or can be used in standalone when e.g. elimination from the body has already occurred. Drugs of abuse are often used together and, therefore, multi-analyte methods capable of detecting several substances and their metabolites in a single run are of importance...
April 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28187392/reductive-immobilization-of-pertechnetate-in-soil-and-groundwater-using-synthetic-pyrite-nanoparticles
#17
Lijuan Huo, Wenbo Xie, Tianwei Qian, Xiaohong Guan, Dongye Zhao
Radioactive technetium ((99)Tc) is of intense concern because of its toxicity and high mobility in the environment. Reduction of Tc(VII) to Tc(IV) decreases the mobility and availability of technetium in soil and groundwater. In this study, pyrite nanoparticles (FeS2) were synthesized, characterized and tested for immobilizing/removing (99)Tc(VII) in soil and groundwater through batch and column experiments. Influences of particle dosage, dissolved organic matter (DOM), and pH on the reductive immobilization kinetics were examined...
February 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28187391/dissolved-organic-matter-affects-the-bioaccumulation-of-copper-and-lead-in-chlorella-pyrenoidosa-a-case-of-long-term-exposure
#18
Wen Shi, Zanfang Jin, Shiyin Hu, Xiaoman Fang, Feili Li
This study evaluated the impact of dissolved organic matter (DOM) of varying molecule weights (MWs) on long-term exposure to Cu and Pb in Chlorella pyrenoidosa. Citric acid, fulvic acid, and humic acid, in the order of increasing MWs, were selected to represent DOM. The results showed that DOM with larger MWs had stronger inhibitory effects on the bioavailability of Cu to algae. However, the biosorption isotherm of Pb in the presence of DOM was different: as Pb equilibrium concentration increased, the biosorption capacity increased sharply to a maximum, then decreased...
February 2, 2017: Chemosphere
https://www.readbyqxmd.com/read/28186141/spatial-variations-in-the-molecular-diversity-of-dissolved-organic-matter-in-water-moving-through-a-boreal-forest-in-eastern-finland
#19
Jun'ichiro Ide, Mizue Ohashi, Katsutoshi Takahashi, Yuko Sugiyama, Sirpa Piirainen, Pirkko Kortelainen, Nobuhide Fujitake, Keitaro Yamase, Nobuhito Ohte, Mina Moritani, Miyako Hara, Leena Finér
Dissolved organic matter (DOM) strongly affects water quality within boreal forest ecosystems. However, how the quality of DOM itself changes spatially is not well understood. In this study, to examine how the diversity of DOM molecules varies in water moving through a boreal forest, the number of DOM molecules in different water samples, i.e., rainwater, throughfall, soil water, groundwater, and stream water was determined using Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) in Norway spruce and Scots pine stands in eastern Finland during May and June 2010...
February 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28186120/dimerisation-induced-formation-of-the-active-site-and-the-identification-of-three-metal-sites-in-eal-phosphodiesterases
#20
Dom Bellini, Sam Horrell, Andrew Hutchin, Curtis W Phippen, Richard W Strange, Yuming Cai, Armin Wagner, Jeremy S Webb, Ivo Tews, Martin A Walsh
The bacterial second messenger cyclic di-3',5'-guanosine monophosphate (c-di-GMP) is a key regulator of bacterial motility and virulence. As high levels of c-di-GMP are associated with the biofilm lifestyle, c-di-GMP hydrolysing phosphodiesterases (PDEs) have been identified as key targets to aid development of novel strategies to treat chronic infection by exploiting biofilm dispersal. We have studied the EAL signature motif-containing phosphodiesterase domains from the Pseudomonas aeruginosa proteins PA3825 (PA3825(EAL)) and PA1727 (MucR(EAL))...
February 10, 2017: Scientific Reports
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