Read by QxMD icon Read


Min-Da Yu, Xiao-Song He, Bei-Dou Xi, Ru-Tai Gao, Xian-Wei Zhao, Hui Zhang, Cai-Hong Huang, Wenbing Tan
Fluorescence excitation-emission matrix (EEM) spectroscopy combined with principal component analysis (PCA) and parallel factor analysis (PARAFAC) were used to investigate the compositional characteristics of dissolved and particulate/colloidal organic matter and its correlations with nitrogen, phosphorus, and heavy metals in an effluent-dominated stream, Northern China. The results showed that dissolved organic matter (DOM) was comprised of fulvic-like, humic-like, and protein-like components in the water samples, and fulvic-like substances were the main fraction of DOM among them...
January 17, 2018: Environmental Science and Pollution Research International
Ruiping Liu, Chuan Tian, Chengzhi Hu, Zenglu Qi, Huijuan Liu, Jiuhui Qu
The presence of bromide ion (Br-) complicates the formation of disinfection by-products (DBPs) during chlorination and chloramination greatly. To better illustrate the role of Br-, Br- was introduced at different time intervals, i.e., 0min, 5min, 30min, and 24h, after dosing with chlorine (Cl2) or chloramine (NH2Cl), and the formation of trihalomethanes (THMs), haloacetic acids (HAAs), haloacetonitriles, and haloacetones was investigated during these two disinfection scenarios. Ammonia rapidly reacts with chlorine and forms low-reactivity NH2Cl, and this effect inhibits the formation of these DBPs greatly...
December 28, 2017: Science of the Total Environment
Yannick Casamayou-Boucau, Alan G Ryder
Anisotropy resolved multidimensional emission spectroscopy (ARMES) provides valuable insights into multi-fluorophore systems like proteins that have complex overlapping emission bands. The method combines multidimensional fluorescence, anisotropy, and chemometrics to facilitate the differentiation of fluorophores with very similar emission properties. Here, we address the critical issue of standardizing the chemometric methods required to accurately extract spectral and anisotropy information from fluorophore mixtures using two standard sample sets: perylene in glycerol, and a mixture of Erythrosin B and Phloxine B with overlapping emission but different anisotropies...
February 13, 2018: Analytica Chimica Acta
Geoffrey L House, Matthew W Hahn
With advances in sequencing technology, research in the field of landscape genetics can now be conducted at unprecedented spatial and genomic scales. This has been especially evident when using sequence data to visualize patterns of genetic differentiation across a landscape due to demographic history, including changes in migration. Two recent model-based visualization methods that can highlight unusual patterns of genetic differentiation across a landscape, SpaceMix and EEMS, are increasingly used. While SpaceMix's model can infer long-distance migration, EEMS' model is more sensitive to short-distance changes in genetic differentiation, and it is unclear how these differences may affect their results in various situations...
December 28, 2017: Molecular Ecology Resources
Seam Noh, Jihee Kim, Jin Hur, Yongseok Hong, Seunghee Han
The monomethylmercury (MMHg) concentrations, water quality parameters (e.g., pH, suspended particles, total phosphorus, sulfate, and chlorophyll-a), and compositions of dissolved organic matter (DOM) were analyzed to understand how the quality of DOM is related to the MMHg distributions in the surface waters of 14 reservoirs. The excitation-emission matrix (EEM) fluorescence spectroscopy identified six fluorescence peaks, and a parallel factor analysis (PARAFAC) of EEM spectra identified three components of DOM: microbial humic-like (C1), terrestrial humic-like (C2), and protein-like DOM (C3)...
December 17, 2017: Environmental Science and Pollution Research International
Shasha Liu, Yuanrong Zhu, Leizhen Liu, Zhongqi He, John P Giesy, Yingchen Bai, Fuhong Sun, Fengchang Wu
Complexation and coagulation of plant-derived dissolved organic matter (DOM) by metal cations are important biogeochemical processes of organic matter in aquatic systems. Thus, coagulation and fractionation of DOM derived from aquatic plants by Ca(II), Al(III), and Fe(III) ions were investigated. Metal ion-induced removal of DOM was determined by analyzing dissolved organic carbon in supernatants after addition of these metal cations individually. After additions of metal ions, both dissolved and coagulated organic fractions were characterized by use of fluorescence excitation emission matrix-parallel factor (EEM-PARAFAC) analysis and Fourier transform infrared (FT-IR) spectroscopy...
December 11, 2017: Environmental Pollution
Andrea Solnes Miltenburg, Lisette van der Eem, Elias C Nyanza, Sandra van Pelt, Pendo Ndaki, Namanya Basinda, Johanne Sundby
Antenatal care is essential to improve maternal and newborn health and wellbeing. The majority of pregnant women in Tanzania attend at least one visit. Since implementation of the focused antenatal care model, quality of care assessments have mostly focused on utilization and coverage of routine interventions for antenatal care. This study aims to assess the quality of antenatal care provision from a holistic perspective in a rural district in Tanzania. Structure, process and outcome components of quality are explored...
2017: PloS One
Xiying Gou, Panyue Zhang, Yonghui Song, Feng Qian, Huibing Yu, Guangming Zeng
In this study, coagulation process was applied to treat the effluent of pharmaceutical wastewater using polymeric ferric sulfate as a coagulant. Three-dimensional excitation-emission matrix fluorescence spectroscopy coupled with parallel factor analysis (EEMs-PARAFAC) was applied to investigate the fluorescent characteristics of dissolved organic matter (DOM) from pharmaceutical wastewater and the reduction of contaminant and fluorescent variations in the coagulation process. It shows that coagulation was effective to remove contaminants in the effluent of pharmaceutical wastewater, and the optimum coagulate dosage was 0...
December 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Xujing Guo, Huibin Yu, Zongcheng Yan, Hongjie Gao, Yizhang Zhang
Accumulative fluorescence emission (AFE) spectroscopy combined with principal component analysis (PCA), second derivative and canonical correlation analysis (CCA) was firstly developed into an available tool to track variations in dissolved organic matter (DOM) fractions and contents during wastewater treatment. Samples were collected from a wastewater treatment plant with a traditional anaerobic/anoxic/oxic (A2O) process. The AFE spectroscopy deduced from the sum of intensities along the excitation wavelengths of fluorescence excitation emission matrix (EEM), could distinctly track tyrosine-like, tryptophan-like, fulvic-like substances...
December 6, 2017: Chemosphere
Hai Guo, Cheng-Gang Niu, Xiao-Ju Wen, Lei Zhang, Chao Liang, Xue-Gang Zhang, Dan-Lin Guan, Ning Tang, Guang-Ming Zeng
In this work, the novel ternary AgBr/Ag/PbBiO2Br Z-scheme photocatalysts were synthesized via a CTAB-assisted calcination process. The AgBr/Ag/PbBiO2Br composites were employed for the degradation of rhodamine B (RhB) and antibiotic bisphenol A (BPA) under visible light irradiation. Results showed that the obtained AgBr/Ag-3/PbBiO2Br displayed optimal photocatalytic performance, which could remove almost all RhB within 25 min and effectively decompose 82.3% of BPA in 120 min. Three-dimensional excitation-emission matrix fluorescence spectra (3D EEMs) were utilized for the purposes of fully grasping the behaviors of RhB molecules during the reaction process...
December 5, 2017: Journal of Colloid and Interface Science
Leqian Hu, Shuai Ma, Chunling Yin
In this work, fluorescence spectroscopy combined with multi-way pattern recognition techniques were developed for determining the geographical origin of kudzu root and detection and quantification of adulterants in kudzu root. Excitation-emission (EEM) spectra were obtained for 150 pure kudzu root samples of different geographical origins and 150 fake kudzu roots with different adulteration proportions by recording emission from 330 to 570nm with excitation in the range of 320-480nm, respectively. Multi-way principal components analysis (M-PCA) and multilinear partial least squares discriminant analysis (N-PLS-DA) methods were used to decompose the excitation-emission matrices datasets...
December 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Qingsong Xian, Penghui Li, Chen Liu, Junfang Cui, Zhuo Guan, Xiangyu Tang
Being crucial for predicting the impact of source inputs on a watershed in rainfall events, an understanding of the dynamics and characteristics of dissolved organic matter (DOM) export from the soil under particular land use types, particularly those associated with underground flows is still largely lacking. A field study was carried out using a 1500m2 slope farmland plot in the hilly area of Sichuan Basin, Southwest China. The discharge of surface runoff and fracture flow was recorded and samples were collected in four representative rainfall events...
December 5, 2017: Science of the Total Environment
Hoi-Sen Yong, Sze-Looi Song, Phaik-Eem Lim, Praphathip Eamsobhana
The tephritid fruit fly Zeugodacus tau (Walker) is a polyphagous fruit pest of economic importance in Asia. Studies based on genetic markers indicate that it forms a species complex. We report here (1) the complete mitogenome of Z. tau from Malaysia and comparison with that of China as well as the mitogenome of other congeners, and (2) the relationship of Z. tau taxa from different geographical regions based on sequences of cytochrome c oxidase subunit I gene. The complete mitogenome of Z. tau had a total length of 15631 bp for the Malaysian specimen (ZT3) and 15835 bp for the China specimen (ZT1), with similar gene order comprising 37 genes (13 protein-coding genes-PCGs, 2 rRNA genes, and 22 tRNA genes) and a non-coding A + T-rich control region (D-loop)...
2017: PloS One
Tzuhua Lin, Jukka Pajarinen, Akira Nabeshima, Laura Lu, Karthik Nathan, Eemeli Jämsen, Zhenyu Yao, Stuart B Goodman
BACKGROUND: Mesenchymal stem cells (MSCs) are capable of immunomodulation and tissue regeneration, highlighting their potential translational application for treating inflammatory bone disorders. MSC-mediated immunomodulation is regulated by proinflammatory cytokines and pathogen-associated molecular patterns such as lipopolysaccharide (LPS). Previous studies showed that MSCs exposed to interferon gamma (IFN-γ) and the proinflammatory cytokine tumor necrosis factor alpha (TNF-α) synergistically suppressed T-cell activation...
December 6, 2017: Stem Cell Research & Therapy
Thomas Attin, Klaus Becker, Daniel B. Wiedemeier, Patrick R. Schmidlin, Florian J. Wegehaupt
This study analyzed the anti-erosive effect of a self-assembling peptide fibre gel. One hundred and twelve bovine enamel samples were ground flat and subjected to a three times de- and re-mineralization cycle: erosion (5min, HCl, pH2.6) alternated with storage in artificial saliva under agitation. Then, samples were covered with dif-ferent anti-erosive compounds (2min): Duraphat toothpaste (DT), Elmex Erosion Protection Tooth-paste (EET) or Elmex Gelée (EG)– all mixed with saliva (1:3)–, Elmex Erosion Protection Mouth-wash (EEM), Curodont Protect (CP; self-assem-bling peptide gel) or MI Paste Plus (MIP)...
2017: Swiss Dental Journal
Tapan D Patel, Oliver Y Chin, Soly Baredes, Jean Anderson Eloy, Yu-Lan Mary Ying
OBJECTIVE: Malignant melanoma accounts for nearly 75% of all skin cancer deaths, and the incidence is on the rise in the United States. External ear melanoma (EEM) is rare, and there is little long-term data regarding the clinical behavior of this melanoma site. This study analyzes the demographic, clinicopathologic, and survival characteristics of EEM. METHODS: The SEER database was queried for EEM cases from 1973 to 2012 (8,982 cases). Data analyzed included patient demographics, incidence trends, and survival outcomes...
November 30, 2017: Otology & Neurotology
Longlong Zhang, Qinyan Yue, Kunlun Yang, Pin Zhao, Baoyu Gao
Extracellular polymeric substances (EPS) and ciprofloxacin-degrading microbial community in the combined Fe-C micro-electrolysis and up-flow biological aerated filter (UBAF) process for the treatment of high-level ciprofloxacin (CIP) were analyzed. The research demonstrated a great potential of Fe-C micro-electrolysis-UBAF for the elimination of high-level CIP. Above 90% of CIP removal was achieved through the combined process at 100 mg L(-1) of CIP loading. In UBAF, the pollutants were mainly removed at 0-70 cm heights...
November 14, 2017: Chemosphere
Minkyu Park, Shane A Snyder
In environmental engineering and science, fluorescent excitation-emission matrix (EEM) has increasingly been utilized to characterize chromophoric dissolved organic matter (CDOM). This study aims to delineate EEM data processing, including calculation of total fluorescence (TF) which is an emerging water quality parameter often used as a surrogate for micropollutant removal by advanced water treatment processes. In addition, sample handling procedures such as storage, use of preservatives, and oxidant quenching agents were evaluated...
November 16, 2017: Chemosphere
Matthew Combs, Emily E Puckett, Jonathan Richardson, Destiny Mims, Jason Munshi-South
Human commensal species such as rodent pests are often widely distributed across cities and threaten both infrastructure and public health. Spatially-explicit population genomic methods provide insights into movements for cryptic pests that drive evolutionary connectivity across multiple spatial scales. We examined spatial patterns of neutral genome-wide variation in brown rats (Rattus norvegicus) across Manhattan, New York City (NYC) using 262 samples and 61,401 SNPs to understand: 1) relatedness among nearby individuals and the extent of spatial genetic structure in a discrete urban landscape; 2) the geographic origin of NYC rats, using a large, previously-published dataset of global rat genotypes; and 3) heterogeneity in gene flow across the city, particularly deviations from isolation-by-distance...
November 22, 2017: Molecular Ecology
Martha J M Wells, Gene A Mullins, Katherine Y Bell, Allegra K Da Silva, Eileen M Navarrete
The Neuse River, North Carolina, U.S., exemplifies a typical de facto potable reuse scenario, where drinking water sources are located downstream of treated wastewater effluent discharges. The study results imply that planned potable water reuse, whether in an indirect or direct potable reuse scenario, might provide better control over water quality than the status quo conditions. Using fluorescence excitation-emission matrix (EEM) measurements, anthropogenic influence of a wastewater treatment plant (WWTP) discharge was observed in samples near the location of drinking water treatment plant (WTP) intakes, eight or more miles downstream of the WWTP, implying that anthropogenic compounds were not fully removed or degraded by natural processes in this reach of the river...
November 17, 2017: Environmental Science & Technology
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"