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https://www.readbyqxmd.com/read/28718629/hadamard-transform-fluorescence-excitation-emission-matrix-spectroscopy
#1
Nicholas L P Andrews, Travis Ferguson, Alana M M Rangaswamy, Adam Bernicky, Niklas Henning, Alexander Dudelzak, Oliver Reich, Jack A Barnes, Hans-Peter Loock
We present a fluorescence excitation emission spectrometer with superior data acquisition rates over previous instruments. White light from a white light emitting diode (LED) source is dispersed onto a digital micromirror array (DMA) and encoded using binary n-size Walsh functions ("barcodes"). The encoded excitation light is used to irradiate the liquid sample and its fluorescence is dispersed and detected using a conventional array spectrometer. After exposure to excitation light encoded in n different ways, the 2-dimensional EEM spectrum is obtained by inverse Hadamard transformation...
July 18, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28710360/dom-mediated-membrane-retention-of-fluoroquinolone-as-revealed-by-fluorescence-quenching-properties
#2
Shuang Liang, Li Lu, Fangang Meng
In this study, membrane filtration tests showed that the membrane rejection degree of difloxacin hydrochloride (DFHC) increased significantly in the presence of Suwannee River DOM or Aldrich humic acid (2-10 mg-C/L). Titration experiments showed that the excitation and emission of Peak R belonging to DFHC exhibited blue shifts by 5 nm and 10 nm, respectively, in the presence of DOM. The presence of DFHC can, in turn, lead to more significant overlapping of the fluorescence peaks of the Suwannee River DOM and Aldrich humic acid...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28707563/studies-on-removal-of-phenol-sulfonic-acid-syntan-in-aqueous-medium-using-ozonation
#3
Rema Thankappan, S V Srinivasan, R Suthanthararajan, Mika Sillanpää
The removal of Phenol Sulfonic Acid-Syntan (PSAS) in terms of Chemical Oxygen Demand (COD) was studied at different pH, Ozone and initial PSAS concentrations and the optimum condition was found to be pH 7, ozone concentration of 5.2 ×10(-)(3)mmol/L and initial PSAS concentration of 500 mg/L. The increase in BOD5/COD ratio confirmed the bio-treatability of ozonated PSAS effluent. The Excitation Emission Matrix (EEM) intensity and Fourier Transmission Infra-red spectroscopy (FTIR) confirmed the generation of intermediate by-product during degradation of PSAS...
July 14, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28692882/capture-of-perchlorate-by-a-surface-modified-bio-sorbent-and-its-bio-regeneration-properties-adsorption-computations-and-biofouling
#4
Zhongfei Ren, Xing Xu, Baoyu Gao, Yanwei Li, Jian Kong, Yanan Shang, Wen Song, Qingzhu Zhang
A magnetic amine-crosslinked reed (MACR) was synthesized by an insitu precipitation method and used for perchlorate uptake. The morphological properties of clean MACR, perchlorate-saturated MACR and bio-regenerated MACR samples were determined using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and zeta potential measurements. The adsorption capacities of perchlorate by clean and bio-regenerated MACRs were determined. The density functional theory (DFT) method was employed to evaluate the binding free energies between various anions and ammonium/hydroxy groups...
July 3, 2017: Chemosphere
https://www.readbyqxmd.com/read/28666289/intractable-epilepsy-due-to-mtr-deficiency-importance-of-homocysteine-analysis
#5
Jonna Komulainen-Ebrahim, Eemeli Saastamoinen, Elisa Rahikkala, Heli Helander, Reetta Hinttala, Leila Risteli, Heikki Rantala, Johanna Uusimaa
No abstract text is available yet for this article.
June 30, 2017: Neuropediatrics
https://www.readbyqxmd.com/read/28655115/characteristics-and-fate-of-natural-organic-matter-during-uv-oxidation-processes
#6
Yongtae Ahn, Doorae Lee, Minhwan Kwon, Il-Hwan Choi, Seong-Nam Nam, Joon-Wun Kang
Advanced oxidation processes (AOPs) are widely used in water treatments. During oxidation processes, natural organic matter (NOM) is modified and broken down into smaller compounds that affect the characteristics of the oxidized NOM by AOPs. In this study, NOM was characterized and monitored in the UV/hydrogen peroxide (H2O2) and UV/persulfate (PS) processes using a liquid chromatography-organic carbon detector (LC-OCD) technique, and a combination of excitation-emission matrices (EEM) and parallel factor analysis (PARAFAC)...
June 19, 2017: Chemosphere
https://www.readbyqxmd.com/read/28654809/interactions-between-stepwise-eluted-sub-fractions-of-fulvic-acids-and-protons-revealed-by-fluorescence-titration-combined-with-eem-parafac
#7
Fanhao Song, Fengchang Wu, Fei Guo, Hao Wang, Weiying Feng, Min Zhou, Yanghui Deng, Yingchen Bai, Baoshan Xing, John P Giesy
In aquatic environments, pH can control environmental behaviors of fulvic acid (FA) via regulating hydrolysis of functional groups. Sub-fractions of FA, eluted using pyrophosphate buffers with initial pHs of 3.0 (FA3), 5.0 (FA5), 7.0 (FA7), 9.0 (FA9) and 13.0 (FA13), were used to explore interactions between the various, operationally defined, FA fractions and protons, by use of EEM-PARAFAC analysis. Splitting of peaks (FA3 and FA13), merging of peaks (FA7), disappearance of peaks (FA9 and FA13), and red/blue-shifting of peaks were observed during fluorescence titration...
June 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28649045/roles-of-phytoplankton-and-macrophyte-derived-dissolved-organic-matter-in-sulfamethazine-adsorption-on-goethite
#8
Leilei Bai, Chicheng Cao, Chunliu Wang, Changhui Wang, Hui Zhang, Helong Jiang
Phytoplankton-derived dissolved organic matter (PDOM) and macrophyte-derived dissolved organic matter (MDOM) exist ubiquitously in eutrophic freshwater lakes. To understand the heterogeneous roles of individual fluorescent DOM components in the adsorption of antibiotics onto sediment minerals, the adsorptive fractionation of DOM on goethite (α-FeOOH) and its interaction with sulfamethazine (SMT) were investigated using fluorescence excitation-emission matrix combined with parallel factor analysis (EEM-PARAFAC)...
June 22, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28647245/transport-and-humification-of-dissolved-organic-matter-within-a-semi-arid-floodplain
#9
Wenming Dong, Jiamin Wan, Tetsu K Tokunaga, Benjamin Gilbert, Kenneth H Williams
In order to understand the transport and humification processes of dissolved organic matter (DOM) within sediments of a semi-arid floodplain at Rifle, Colorado, fluorescence excitation-emission matrix (EEM) spectroscopy, humification index (HIX) and specific UV absorbance (SUVA) at 254nm were applied for characterizing depth and seasonal variations of DOM composition. Results revealed that late spring snowmelt leached relatively fresh DOM from plant residue and soil organic matter down into the deeper vadose zone (VZ)...
July 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28646799/tracking-the-activity-of-the-anammox-damo-process-using-excitation-emission-matrix-eem-fluorescence-spectroscopy
#10
Yong-Ze Lu, Na Li, Zhao-Wei Ding, Liang Fu, Ya-Nan Bai, Guo-Ping Sheng, Raymond J Zeng
Coupling of anaerobic ammonium oxidation (anammox) and denitrifying anaerobic methane oxidation (DAMO) microorganisms in a hollow-fiber membrane biofilm reactor (HfMBR) is a potential strategy for simultaneous anaerobic removal of nitrogen and methane in wastewater streams. In these systems, effluents contain dissolved organic substances from anammox and DAMO microorganisms, but their characteristics and relationships have not been investigated. In the present study, excitation-emission matrix (EEM) fluorescence spectroscopy was used to characterize effluent dissolved organic matter (EfDOM) from an Anammox-DAMO HfMBR...
June 14, 2017: Water Research
https://www.readbyqxmd.com/read/28642971/high-diversity-of-bacterial-communities-in-developmental-stages-of-bactrocera-carambolae-insecta-tephritidae-revealed-by-illumina-miseq-sequencing-of-16s-rrna-gene
#11
Hoi-Sen Yong, Sze-Looi Song, Kah-Ooi Chua, Phaik-Eem Lim
Bactrocera carambolae is a highly polyphagous fruit pest of agricultural importance. This study reports the bacterial communities associated with the developmental stages of B. carambolae. The microbiota of the developmental stages were investigated by targeted 16S rRNA gene (V3-V4 region) sequencing using the Illumina MiSeq. At 97% similarity, there were 19 bacterial phyla and unassigned bacteria, comprising 39 classes, 86 orders, 159 families and 311 genera. The bacterial composition varied among the specimens of developmental stage and across developmental stages as well as exuviae...
June 23, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28577143/spectroscopic-and-molecular-characterization-of-humic-substances-hs-from-soils-and-sediments-in-a-watershed-comparative-study-of-hs-chemical-fractions-and-the-origins
#12
Morgane Derrien, Yun Kyung Lee, Jae-Eun Park, Penghui Li, Meilian Chen, Sang Hee Lee, Soo Hyung Lee, Jun-Bae Lee, Jin Hur
Optical properties and molecular composition of humic substances (HS) can provide valuable information on the sources and the history of the associated biogeochemical processes. In this study, many well-known spectral and molecular characteristics were examined in eight different HS samples, which were extracted from soils and sediments located in a forested watershed, via two advanced tools including fluorescence excitation emission matrix-parallel factor analysis (EEM-PARAFAC) and high-resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS)...
July 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28574469/fluorometric-index-for-sensing-oil-in-the-sea-environment
#13
Emilia Baszanowska, Zbigniew Otremba
Excitation-emission matrix spectroscopy (EEMS) was applied to determine the fluorometric index (FI) as a parameter indicating the presence of a source of oil pollution in a specific area of the sea. Seawater from the Polish coast (the Baltic Sea) and the same water combined with various amounts of crude oil extracted from the Baltic Sea shelf (Petrobaltic-type oil) were used in this study. The FI values were calculated for excitation and emission wavelengths found at the maximal peak, taking into account the natural seawater and the seawater artificially contaminated (for an oil-to-water ratio range of 0...
June 2, 2017: Sensors
https://www.readbyqxmd.com/read/28550631/study-on-substrate-metabolism-process-of-saline-waste-sludge-and-its-biological-hydrogen-production-potential
#14
Zengshuai Zhang, Liang Guo, Qianqian Li, Yangguo Zhao, Mengchun Gao, Zonglian She
With the increasing of high saline waste sludge production, the treatment and utilization of saline waste sludge attracted more and more attention. In this study, the biological hydrogen production from saline waste sludge after heating pretreatment was studied. The substrate metabolism process at different salinity condition was analyzed by the changes of soluble chemical oxygen demand (SCOD), carbohydrate and protein in extracellular polymeric substances (EPS), and dissolved organic matters (DOM). The excitation-emission matrix (EEM) with fluorescence regional integration (FRI) was also used to investigate the effect of salinity on EPS and DOM composition during hydrogen fermentation...
July 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28549327/achievement-performance-and-characteristics-of-microbial-products-in-a-partial-nitrification-sequencing-batch-reactor-as-a-pretreatment-for-anaerobic-ammonium-oxidation
#15
Heng Dong, Keyi Zhang, Xiao Han, Bin Du, Qin Wei, Dong Wei
This study was carried out to evaluate achievement, performance and characteristics of microbial products in a partial nitrification sequencing batch reactor as a pretreatment for anaerobic ammonium oxidation (anammox). After 100 days long-term operation, the effluent NO2(-)-N/NH4(+)N ratio of the reactor was average at 1.3 and NO3(-)-N concentration was low by controlling low dissolved oxygen (DO) concentration, which was considered as the ideal influent for anammox. Specific oxygen uptake rate (SOUR) implied that (SOUR)NH4 and (SOUR)NO2 of ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) in sludge changed from 21...
May 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/28540548/influence-of-surface-properties-of-ro-membrane-on-membrane-fouling-for-treating-textile-secondary-effluent
#16
Zhonglong Yin, Cheng Yang, Chao Long, Aimin Li
Reverse osmosis (RO) is a promising technology for treating and reusing textile secondary effluent (SE). To better understand the effect of membrane surface properties on membrane fouling, the performances of three commercial polyamide thin-film composite RO membranes (BW30-4040, CPA2-4040, and RE-4040-FEN) with different roughness and hydrophilicity were investigated for treating textile SE. The RO membranes were characterized by ATR-FTIR, SEM, AFM, and contact angle, respectively. The results showed that the flux increased with an increase in the surface hydrophilicity of membrane...
July 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28432890/characterization-of-spectral-responses-of-dissolved-organic-matter-dom-for-atrazine-binding-during-the-sorption-process-onto-black-soil
#17
Yifan Wang, Xinyuan Zhang, Xing Zhang, Qingjuan Meng, Fengjie Gao, Ying Zhang
This study was aim to investigate the interaction between soil-derived dissolved organic matter (DOM) and atrazine as a kind of pesticides during the sorption process onto black soil. According to the experimental data, the adsorption capacity of Soil + DOM, Soil and DOM were 41.80, 31.45 and 9.35 mg kg(-1), separately, which indicated that DOM significantly enhanced the adsorption efficiency of atrazine by soil. Data implied that the pseudo-second-order kinetic equation could well explain the adsorption process...
April 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28417327/influence-of-land-use-and-land-cover-on-the-spatial-variability-of-dissolved-organic-matter-in-multiple-aquatic-environments
#18
Shatrughan Singh, Padmanava Dash, Saurav Silwal, Gary Feng, Ardeshir Adeli, Robert J Moorhead
Water quality of lakes, estuaries, and coastal areas serves as an indicator of the overall health of aquatic ecosystems as well as the health of the terrestrial ecosystem that drains to the water body. Land use and land cover plays not only a significant role in controlling the quantity of the exported dissolved organic matter (DOM) but also influences the quality of DOM via various biogeochemical and biodegradation processes. We examined the characteristics and spatial distribution of DOM in five major lakes, in an estuary, and in the coastal waters of the Mississippi, USA, and investigated the influence of the land use and land cover of their watersheds on the DOM composition...
April 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28402898/predicting-potential-release-of-dissolved-organic-matter-from-biochars-derived-from-agricultural-residues-using-fluorescence-and-ultraviolet-absorbance
#19
Ming Li, Afeng Zhang, Haiming Wu, Hai Liu, Jialong Lv
A combination of fluorescence excitation-emission (EEM) spectrophotometry with parallel factor analysis (PARAFAC) and UV-vis spectroscopy was used to assess dissolved organic matter (DOM) release by the wheat straw-derived biochar in various environmental conditions. The results showed that the concentration of dissolved organic carbon (DOC) extracted from the biochar ranged from 435 to 5000mgkg(-1), and the high DOM release would occur under the high temperature and alkaline environmental conditions. Four humic acid-like substances (C1, C2, C4 and C5), one fulvic acid-like substance (C3) and one tryptophan-like substance (C6) were identified by PARAFAC model...
March 31, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28400762/production-and-reutilization-of-fluorescent-dissolved-organic-matter-by-a-marine-bacterial-strain-alteromonas-macleodii
#20
Shuji Goto, Yuya Tada, Koji Suzuki, Youhei Yamashita
The recalcitrant fraction of marine dissolved organic matter (DOM) plays an important role in carbon storage on the earth's surface. Bacterial production of recalcitrant DOM (RDOM) has been proposed as a carbon sequestration process. It is still unclear whether bacterial physiology can affect RDOM production. In this study, we conducted a batch culture using the marine bacterial isolate Alteromonas macleodii, a ubiquitous gammaproteobacterium, to evaluate the linkage between bacterial growth and DOM production...
2017: Frontiers in Microbiology
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