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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
#1
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
#2
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
#3
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
#4
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
https://www.readbyqxmd.com/read/28391456/characterization-of-extracellular-polymeric-substances-in-biofilms-under-long-term-exposure-to-ciprofloxacin-antibiotic-using-fluorescence-excitation-emission-matrix-and-parallel-factor-analysis
#5
Chaochao Gu, Pin Gao, Fan Yang, Dongxuan An, Mariya Munir, Hanzhong Jia, Gang Xue, Chunyan Ma
The presence of antibiotic residues in the environment has been regarded as an emerging concern due to their potential adverse environmental consequences such as antibiotic resistance. However, the interaction between antibiotics and extracellular polymeric substances (EPSs) of biofilms in wastewater treatment systems is not entirely clear. In this study, the effect of ciprofloxacin (CIP) antibiotic on biofilm EPS matrix was investigated and characterized using fluorescence excitation-emission matrix (EEM) and parallel factor (PARAFAC) analysis...
April 8, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28386240/embodiment-and-emotional-memory-in-first-vs-second-language
#6
Jenny C Baumeister, Francesco Foroni, Markus Conrad, Raffaella I Rumiati, Piotr Winkielman
Language and emotions are closely linked. However, previous research suggests that this link is stronger in a native language (L1) than in a second language (L2) that had been learned later in life. The present study investigates whether such reduced emotionality in L2 is reflected in changes in emotional memory and embodied responses to L2 in comparison to L1. Late Spanish/English bilinguals performed a memory task involving an encoding and a surprise retrieval phase. Facial motor resonance and skin conductance (SC) responses were recorded during encoding...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28382432/reliability-improvement-for-predicting-acid-forming-potential-of-rock-samples-using-static-tests
#7
Chamteut Oh, Sangwoo Ji, Chul-Min Chon, Giljae Yim, Youngwook Cheong
In predicting the acid-forming potential of rock samples, a combination of acid-base accounting (ABA) and net acid generation (NAG) tests has been commonly used. While simple and economical, this method sometimes shows low reliability such as categorizing certain samples as uncertain (UC). ABA and NAG tests were modified to selectively recover valid minerals in nature and substituted for the original tests. ABA test overestimated acid-producing capacity (in the case of weathered samples) and acid-neutralizing capacity (in the case of plagioclase-including samples) compared to the modified ABA test...
May 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28372160/characterization-of-cereal-flours-by-fluorescence-spectroscopy-coupled-with-parafac
#8
Lea Lenhardt, Ivana Zeković, Tatjana Dramićanin, Bojana Milićević, Jovana Burojević, Miroslav D Dramićanin
This paper presents parallel factor analysis (PARAFAC) of fluorescence of cereal flours. Excitation-emission matrices (EEM's) of different cereal flours (wheat, corn, rye, rice, oat, spelt, barley and buckwheat) were measured in a front-face configuration over the ultraviolet-visible spectral range. EEM's showed that flours strongly fluoresce in two spectral regions, where amino acids, tocopherols, pyridoxine and 4-aminobenzoic acid show intense emissions. 4-component PARAFAC was used to model flour fluorescence and to decompose EEM's into excitation and emission spectra of each component...
August 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28370723/persistence-of-historical-population-structure-in-an-endangered-species-despite-near-complete-biome-conversion-in-california-s-san-joaquin-desert
#9
Jonathan Q Richmond, Dustin A Wood, Michael F Westphal, Amy G Vandergast, Adam D Leaché, Lawrence R Saslaw, H Scott Butterfield, Robert N Fisher
Genomic responses to habitat conversion can be rapid, providing wildlife managers with time-limited opportunities to enact recovery efforts that use population connectivity information that reflects pre-disturbance landscapes. Such opportunities may still exist for the endemic fauna and flora of California's San Joaquin Desert, where biome conversion is nearly complete, but comprehensive genetic datasets are lacking for nearly all species in the region. To fill this knowledge gap, we studied the rangewide population structure of the endangered blunt-nosed leopard lizard Gambelia sila, a San Joaquin Desert endemic, using restriction site associated DNA (RAD), microsatellite and mtDNA data to test whether admixture patterns and estimates of effective migration surfaces (EEMS) can identify land areas with high population connectivity prior to the conversion of native xeric habitats...
March 30, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28361397/integration-of-coagulation-and-adsorption-for-removal-of-n-nitrosodimethylamine-ndma-precursors-from-biologically-treated-municipal-wastewater
#10
Miaomiao Wang, Yingjie Meng, Defang Ma, Yan Wang, Fengli Li, Xing Xu, Chufan Xia, Baoyu Gao
This study investigated the N-nitrosodimethylamine (NDMA) formation potential of various dissolved organic matter (DOM) fractions in biologically treated municipal wastewater by UF fractionation, XAD-8 resin adsorption isolation, and excitation and emission matrix (EEM) fluorescence spectroscopy. Removal of various NDMA precursor fractions was also analyzed to evaluate the efficiency of traditional water treatment processes (coagulation, adsorption, and coagulation-adsorption). Results showed that NDMA were mainly formed by low molecular weight (MW) fractions (<30 kDa) and hydrophilic fractions (HiS) in biologically treated municipal wastewater...
March 30, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28351133/monitoring-the-behavior-of-emerging-contaminants-in-wastewater-impacted-rivers-based-on-the-use-of-fluorescence-excitation-emission-matrixes-eem
#11
Massimiliano Sgroi, Paolo Roccaro, Gregory V Korshin, Federico G A Vagliasindi
This study investigated the applicability of fluorescence indexes based on the interpretation of excitation emission matrices (EEMs) by PARAFAC analysis and by selecting fluorescence intensities at a priori defined excitation/emission pairs as surrogates for monitoring the behavior of emerging organic compounds (EOCs) in two catchment basins impacted by wastewater discharges. Relevant EOC and EEM data were obtained for a 90 km stretch of the Simeto River, the main river in Sicily, and the smaller San Leonardo River, which was investigated for a 17 km stretch...
April 6, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28340733/migration-test-of-bisphenol-a-from-polycarbonate-cups-using-excitation-emission-fluorescence-data-with-parallel-factor-analysis
#12
M L Spagnuolo, F Marini, L A Sarabia, M C Ortiz
Bisphenol A (BPA) is one of the most largely produced chemical in the world; it is used to make plastics and epoxy resins. The endocrine disruptor potential of BPA is well known, but recent researches suggest a relationship between chronic exposure to BPA, genotoxic activity and epigenetic modifications. The main source of exposure to BPA includes food contact materials (FCM). Thus simple and robust test methods are needed to improve the migration test of BPA. In this work, a non-separative, easy, fast and inexpensive spectrofluorimetric method based on the second order calibration of excitation-emission fluorescence matrices (EEMs) was proposed for the determination of BPA...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28334671/fast-tracking-the-molecular-weight-changes-of-humic-substances-in-coagulation-flocculation-processes-via-fluorescence-eem-parafac
#13
Bilal Aftab, Jin Hur
The removal of a commercial humic acid (HA) and changes in its chemical composition were examined for coagulation/flocculation (C/F) processes based on jar tests using two different coagulants at a wide range of pH. ZrCl4 showed a better performance in eliminating HA than Al2SO4 with the same removal rates at lower dosages. The highest removal rates were found at a neutral pH range (5.0-6.5). The HA was further decomposed into three different humic-like components (C1, C2, and C3) by excitation emission matrix coupled with parallel factor analysis (EEM-PARAFAC)...
March 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/28319761/dynamic-changes-of-dissolved-organic-matter-in-membrane-bioreactors-at-different-organic-loading-rates-evidence-from-spectroscopic-and-chromatographic-methods
#14
Tahir Maqbool, Jinwoo Cho, Jin Hur
Excitation emission matrix-parallel factor analysis (EEM-PARAFAC) and size exclusion chromatography (SEC) were utilized to explore the dynamics in extracellular polymeric substances (EPS), soluble microbial products (SMP), and effluent for the membrane bioreactors at two different organic loading rates (OLRs). Combination of three different fluorescent components explained the compositional changes of dissolved organic matter. The lower OLR resulted in a higher production of tryptophan-like component (C1) in EPS, while the opposite trends were found for the other two components (humic-like C2 and tyrosine-like C3), signifying the role of C1 in the endogenous condition...
March 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28299571/impacts-of-potassium-ferrate-vi-on-the-growth-and-organic-matter-accumulation-production-and-structural-changes-in-the-cyanobacterium-microcystis-aeruginosa
#15
Shu-Yu Liu, Jingling Xu, Wen-Li Chen, Berthold E David, Minghong Wu, Fang Ma
Cyanobacterial blooms generated by nutrient addition into aquatic systems pose serious risks to ecosystems and human health. Though there are established chemical, physical, and biological means of eradication, more efficient and environmentally friendly measures are desired. This study investigates the effect of potassium ferrate(VI) on the growth and intracellular and extracellular organic matter accumulations of the cyanobacterium Microcystis aeruginosa. Cultures were inoculated with three separate concentrations of potassium ferrate(VI) (3, 15, 30 mg L(-1)) and monitored by measuring chlorophyll-a (Chl-a) and intracellular/extracellular dissolved organic carbon...
March 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28288284/sweet-potato-ipomoea-batatas-attenuates-diet-induced-aortic-stiffening-independent-of-changes-in-body-composition
#16
Tyler Garner, An Ouyang, Adam J Berrones, Marilyn S Campbell, Bing Du, Bradley S Fleenor
We hypothesized a sweet potato intervention would prevent high fat diet-induced aortic stiffness, which would be associated with decreased arterial oxidative stress and increased mitochondrial uncoupling. Young (8-week old) C57BL/6J mice were randomly divided into 4 groups: low fat (LF, 10% fat), high fat (HF, 60% fat), low fat sweet potato (LFSP, 10% fat containing 260.3 ug/kcal SP), or high fat sweet potato diet (HFSP, 60% fat containing 260.3 ug/kcal SP) for 16 weeks. Compared to LF and LFSP, HF and HFSP fed mice had increased body mass and percent fat mass with lower percent lean mass (all, P<0...
March 13, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28279609/qualitative-and-quantitative-analysis-of-extracellular-polymeric-substances-in-partial-nitrification-and-full-nitrification-reactors
#17
Dong Wei, Tao Yan, Keyi Zhang, Ya Chen, Na Wu, Bin Du, Qin Wei
In present study, two column-type sequencing batch reactors with alternative anoxic/aerobic phases were operated and compared under partial nitrification and full nitrification modes by controlling different dissolved oxygen (DO) conditions. During steady state, the characterizations of extracellular polymeric substances (EPS) from two reactors were qualitatively and quantitatively analyzed through chemical and spectroscopic approaches. Data implied that partial nitrification reactor had relatively higher total nitrogen (TN) removal efficiency and loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS) contents...
February 28, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28273576/performance-of-microwave-treatment-for-disintegration-of-cephalosporin-mycelial-dreg-cmd-and-degradation-of-residual-cephalosporin-antibiotics
#18
Chen Cai, Huiling Liu, Bing Wang
Significant amounts of cephalosporin mycelial dreg (CMD) are still being generated from biopharmaceutical processes, representing both an economic and environmental burden for pharmaceutical factories. This study investigates the microwave (MW) treatment of CMD at a relatively mild temperature (100°C) within 15min. The results reveal that the MW treatment disintegrates the CMD efficiently and that the residual cephalosporin C (CPC) is almost degraded after sufficient irradiation. MW heating temperature strongly influences the polymer's release...
February 24, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28259078/spectral-characteristics-of-dissolved-organic-matter-in-various-agricultural-soils-throughout-china
#19
Jiakai Gao, Chenglong Liang, Guangzhu Shen, Jialong Lv, Haiming Wu
Dissolved organic matter (DOM) plays an essential role in many environmental processes, particularly in soil ecosystems. In the present study, ultraviolet-visible (UV-Vis) spectroscopy and parallel factor analysis (PARAFAC) of three-dimensional fluorescence excitation-emission matrices (3D-EEMs) were used to characterize DOM extracted from various agricultural soils across four climate regions of China. The maximum (86.01 mg L(-1)) and minimum (17.39 mg L(-1)) dissolved organic carbon (DOC) concentrations were found in soils from Jiangsu and Yunnan, respectively...
March 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/28252936/fluorescence-approach-for-the-determination-of-fluorescent-dissolved-organic-matter
#20
Chen Qian, Long-Fei Wang, Wei Chen, Yan-Shan Wang, Xiao-Yang Liu, Hong Jiang, Han-Qing Yu
Excitation-emission matrix (EEM) fluorescence spectroscopy coupled with parallel factor (PARAFAC) analysis has been widely applied to characterize dissolved organic matter (DOM) in aquatic and terrestrial systems. However, its application in environmental samples is limited because PARAFAC is not able to handle nontrilinear EEM data, leading to the overestimated number of components and incorrect decomposition results. In this work, a new method, parallel factor framework-clustering analysis (PFFCA), is proposed to resolve this problem...
March 14, 2017: Analytical Chemistry
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