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Cherukuri Sowmya, Vuppalapati Lavakumar, Narayanan Venkateshan, Velayutham Ravichandiran, D V R Saigopal
In our present investigation, synthesis of nontoxic, eco friendly and cost effective silver nanoparticles, Phyllanthus acidus (P. acidus) was used as starting material. The influence of phyto-constituents present in aqueous extracts of Phyllanthus acidus was found to be effective in reduction of silver nitrate to free silver nanoparticles (PA-AgNPs). HPTLC finger print analysis reveals the presence of flavonoid, quercetin in aqueous extracts of Phyllanthus acidus. Surface plasmon racemonance exhibited λ max at 462 nm through UV-Vis spectroscopy...
April 20, 2018: Chemistry Central Journal
Zhexi Wan, Tian Li, Yutong Liu
Bioretention systems are designed to manage stormwater, but they are always subject to substantial nitrate leaching. In previous laboratory-scale experiments, nitrate removal was enhanced using wood chips as a medium. However, the ability of field-scale systems to transform and remove nitrogen species is not well understood. Here, we report a wood-chip bioretention system that accepts the natural runoff from an elevated highway. The transformation of different nitrogen species indicates that the field-scale system with wood chips also inhibits nitrogen leaching...
April 20, 2018: Environmental Science and Pollution Research International
Jinsuo Gao, Shouchun Wu, Yanling Han, Feng Tan, Yong Shi, Mengyao Liu, Xinyong Li
Increasing the amount of surface active sites of the material may be a feasible way to improve the efficiency ofthe generation of Fe2+ in the photo-Fenton process. In this work, a simple synthesis method was adopted to synthesize 3D ordered mesoporous CuFe2 O4 with large specific surface areaby using ferric nitrate and copper nitrate as the precursor and KIT-6 as the template. The synthesized materials were characterized by nitrogen adsorption-desorption, XRD, TEM, FT-IR and UV-vis DRS. The catalytic properties of the mesoporous material were thoroughly evaluated by activating hydrogen peroxide to remove sulfonamides in near neutral water...
April 1, 2018: Journal of Colloid and Interface Science
Luca Carena, Mariagrazia Proto, Marco Minella, Giovanni Ghigo, Cristina Giovannoli, Marcello Brigante, Gilles Mailhot, Valter Maurino, Claudio Minero, Davide Vione
The secondary pollutant 3,4-dichloroaniline (DCA) is produced by the biological degradation of several herbicides, including propanil in paddy fields. The enzymatic hydrolysis of propanil yields DCA with almost quantitative yield. DCA undergoes rather fast photodegradation in paddy water, mostly by direct photolysis. An exception might be represented by the cases (rather rare in paddies) of quite high nitrate concentration (around 50 mgNO3- L-1), when DCA degradation by CO3·- would play a comparable role as the direct photolysis...
April 20, 2018: Environmental Science & Technology
Meiyue Ding, Jiahang Li, Xiaodan Liu, Huiru Li, Rui Zhang, Jincai Ma
Waterborne infectious disease outbreak associated with well water contamination is a worldwide public health issue, especially for rural areas in developing countries. In the current study, we characterized 20 well water samples collected from a rural area of southern Changchun city, China, and investigated the survival potential of Escherichia coli O157:H7 in those water samples. The results showed that nitrate and ammonia concentrations in some well water samples exceed the corresponding China drinking water standards, indicating potential contamination by local agricultural farms...
April 2018: Journal of Water and Health
Yvonne M Mos, Karin Bertens Zorzano, Cees J N Buisman, Jan Weijma
Partial oxidation of defined Fe2+ solutions is a well-known method for magnetite synthesis in batch systems. The partial oxidation method could serve as basis for an iron removal process in drinking water production, yielding magnetite (Fe3 O4 ) as a compact and valuable product. As a first step toward such a process, a series of experiments was carried out, in which magnetite was synthesized from an Fe2+ solution in a 2 L continuous stirred tank reactor (CSTR) at atmospheric pressure and 32 °C. In four experiments, elevating the pH from an initial value of 5...
April 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
James Jamieson, Henning Prommer, Anna Kaksonen, Jing Sun, Adam Siade, Anna Yusov, Benjamin C Bostick
Microbially driven nitrate-dependent iron (Fe) oxidation (NDFO) in subsurface environments has been intensively studied. However, the extent to which Fe(II) oxidation is biologically catalyzed remains unclear because no neutrophilic iron-oxidizing and nitrate reducing autotroph has been isolated to confirm the existence of an enzymatic pathway. While mixotrophic NDFO bacteria have been isolated, understanding the process is complicated by simultaneous abiotic oxidation due to nitrite produced during denitrification...
April 20, 2018: Environmental Science & Technology
Xian-Mei Yu, Jin-Zheng Wang, Pei-Xian Nie, Xaio-Min Xue, Gui-Ping Wang, Miao An
BACKGROUND: The preharvest application of Ca-containing foliar fertilizers can reduce bitter pit (BP) incidence in apples and improve fruit quality by increasing the Ca content and decreasing both the N content and the N/Ca ratio in fruits. In this study, we aimed to investigate the control efficacy of Ca-containing fertilizers on BP incidence and the effects on the Ca and N contents in bagged 'Fuji' apple by spraying the foliar fertilizer containing calcium chloride (CaCl2 ), calcium nitrate [Ca(NO3 )2 ] or calcium formate [Ca(HCOO)2 ] at early stage [5 days after full bloom (DAFB) + 40 DAFB] and at late stage (80 DAFB + 125 DAFB)...
April 20, 2018: Journal of the Science of Food and Agriculture
Mariel Gullian Klanian, Mariana Delgadillo Diaz, Javier Aranda, Carolina Rosales Juárez
The objective of this study was to evaluate the potential of tomato plants to efficiently use the nitrogen (N) of a recirculation aquaponic system (RAS) and to evaluate the effects of foliar fertilization as a complement to the water nutrition on the growth of the two tomato cultivars. The significant effect of six macro- and seven micronutrients was evaluated on the plant growth and on the fruit yield. Two experiments were performed in a nutrient film aquaponic unit. The first experiment was designed to study the effects of foliar fertilization on the seedlings of two tomato cultivars Costoluto Genovese (CG) (Solanum lycopersicum L...
April 20, 2018: Environmental Science and Pollution Research International
Shivani Garg, James M Clomburg, Ramon Gonzalez
Convergence of market drivers such as abundant availability of inexpensive natural gas and increasing awareness of its global warming effects have created new opportunities for the development of small-scale gas-to-liquid (GTL) conversion technologies that can efficiently utilize methane, the primary component of natural gas. Leveraging the unique ability of methanotrophs that use methane as carbon and energy source, biological GTL platforms can be envisioned that are readily deployable at remote petroleum drilling sites where large chemical GTL infrastructure is uneconomical to set-up...
April 19, 2018: Journal of Industrial Microbiology & Biotechnology
Britt A Henke, Kendra A Turk-Kubo, Sophie Bonnet, Jonathan P Zehr
Nitrogen (N2 ) fixation is a major source of nitrogen that supports primary production in the vast oligotrophic areas of the world's oceans. The Western Tropical South Pacific has recently been identified as a hotspot for N2 fixation. In the Noumea lagoon (New Caledonia), high abundances of the unicellular N2 -fixing cyanobacteria group A (UCYN-A), coupled with daytime N2 fixation rates associated with the <10 μm size fraction, suggest UCYN-A may be an important diazotroph (N2 -fixer) in this region. However, little is known about the seasonal variability and diversity of UCYN-A there...
2018: Frontiers in Microbiology
Yangzhi Mo, Jun Li, Bin Jiang, Tao Su, Xiaofei Geng, Junwen Liu, Haoyu Jiang, Chengde Shen, Ping Ding, Guangcai Zhong, Zhineng Cheng, Yuhong Liao, Chongguo Tian, Yingjun Chen, Gan Zhang
Humic-like substances (HULIS) are a class of high molecular weight, light-absorbing compounds that are highly related to brown carbon (BrC). In this study, the sources and compositions of HULIS isolated from fine particles collected in Beijing, China during the 2014 Asia-Pacific Economic Cooperation (APEC) summit were characterized based on carbon isotope (13 C and 14 C) and Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR MS) analyses, respectively. HULIS were the main light-absorbing components of water-soluble organic carbon (WSOC), accounting for 80...
April 16, 2018: Environmental Pollution
Cem Senduran, Kemal Gunes, Duygu Topaloglu, Omer Hulusi Dede, Fabio Masi, Ozen Arli Kucukosmanoglu
This study performed in Sapanca Lake catchment area, used as a drinking water resource. Two highways located at northern and southern shores, and a railway at its south are significant sources of pollution. As a possible solution for protecting water quality a pocket wetland constructed and operated. Performances statistically interpreted by Spearman's Correlation test and univariate analysis of variance on collected data. The mean removal efficiencies obtaited were 52% (TSS), 4% (Nitrate), 26% (TN), -5% (TOC), 63% (TP), 4...
April 3, 2018: Chemosphere
Xiaojiang Xu, Hongyuan Zhang, Chao Ma, Hongbo Gu, Han Lou, Shangyun Lyu, Chaobo Liang, Jie Kong, Junwei Gu
In this work, a nanocarbon bridged nanomagnetite network (NC-NMN) is developed through the electrospinning of epichlorohydrin functionalized polystyrene (f-PS), followed by the direct calcination of f-PS and ferric nitrate, which is capable of superfast removing hexavalent chromium (Cr(VI)) from polluted water within only 15 s benefiting from its gridding framework, with an adsorption rate constant of 1.64 g mg-1  min-1 according to the pseudo-second-order kinetics. The well-fitted Langmuir isotherm model indicates a monolayer adsorption for Cr(VI) on NC-NMN...
April 10, 2018: Journal of Hazardous Materials
J Kucera, P Lubal, S Lis, P Taborsky
Water molecules (H2 O) often reduce luminescence lifetimes of various luminescence probes. The change of lifetime is usually caused by dynamic luminescence quenching induced by O-H oscillators which effectively take away energy from excited molecule. The process can be described by Stern-Volmer equation. We have studied selected luminescence systems where it is possible to detect considerable changes of lifetime in presence/absence of H2 O and D2 O in this work for analytical purposes. We have tested both, inorganic (Ln3+ ) and organic compounds using three different instrumentation in order to find the largest change between τH and τD ...
July 1, 2018: Talanta
Ilann Bourgeois, Joël Savarino, Nicolas Caillon, Helene Angot, Albane Barbero, Franck Delbart, Didier Voisin, Jean-Christophe Clement
Nitrogen is an essential nutrient for life on Earth, but in excess, it can lead to environmental issues (e.g., N saturation, loss of biodiversity, acidification of lakes, etc.). Understanding the nitrogen budget (i.e., inputs and outputs) is essential to evaluate the prospective decay of the ecosystem services (e.g., freshwater quality, erosion control, loss of high patrimonial-value plant species, etc.) that subalpine headwater catchments provide, especially as these ecosystems experience high atmospheric nitrogen deposition...
April 19, 2018: Environmental Science & Technology
Sheng-Nan Zhou, Jun-Xiu Lu, Xue-Qing Wang, Mei-Rong Shan, Zhang Miao, Guo-Pin Pan, Xu Jian, Peng Li, Song Ping, Xin-Yan Pang, Yong-Ping Bai, Chao Liu, Shuang-Xi Wang
Development of nitrate tolerance is a major drawback to nitrate therapy. Prostacyclin (PGI2) is a powerful vasodilator produced from prostaglandin (PGH2) by prostacyclin synthase (PGIS) in endothelial cells. This study was to determine the role of PGIS S-nitrosylation in nitrate tolerance induced by nitroglycerin (GTN). In endothelial cells, GTN increased PGIS S-nitrosylation and disturbed PGH2 metabolism, which were normalized by mutants of PGIS cysteine 231/441 to alanine (C231/441A). Clearance of NO by carboxy-PTIO or inhibition of S-nitrosylation by N-acetyl-cysteine decreased GTN-induced PGIS S-nitrosylation...
April 19, 2018: Clinical Pharmacology and Therapeutics
G Di Martino, A Piccirillo, M Giacomelli, D Comin, A Gallina, K Capello, F Buniolo, C Montesissa, L Bonfanti
Drinking water for poultry is not subject to particular microbiological, chemical and physical requirements, thereby representing a potential transmission route for pathogenic microorganisms and contaminants and/or becoming unsuitable for water-administered medications. This study assessed the microbiological, chemical and physical drinking water quality of 28 turkey farms in North-Eastern Italy: 14 supplied with tap water (TW) and 14 with well water (WW). Water salinity, hardness, pH, ammonia, sulphate, phosphate, nitrate, chromium, copper and iron levels were also assessed...
April 17, 2018: Poultry Science
Lakhwinder Singh, Atul Arya, Sumeet Gupta
BACKGROUND: Diabetes is a downregulator of atrial natriuretic peptide (ANP), resulting in reduced nitric oxide level and low expression of endothelial nitric oxide synthase by which nitric oxide level get reduced. In the present study, we examined the role of ANP in reduced nitric oxide level, which may be responsible in controlling diabetic nephropathy in rats. METHODS: Serum nitrite/nitrate ratio, blood urea nitrogen, protein in urine, urinary output, serum creatinine, serum cholesterol, kidney weight, kidney hypertrophy, renal cortical collagen content, thiobarbituric acid level, and antioxidant enzymatic activities were assessed...
April 19, 2018: Journal of Basic and Clinical Physiology and Pharmacology
Chao Peng, Anneli Sundman, Casey Bryce, Charlotte Catrouillet, Thomas Borch, Andreas Kappler
Fe(II)-organic-matter (Fe(II)-OM) complexes are abundant in the environment and may play a key role for the behavior of Fe and pollutants. Mixotrophic nitrate-reducing Fe(II)-oxidizing bacteria (NRFeOx) reduce nitrate coupled to the oxidation of organic compounds and Fe(II). Fe(II) oxidation may occur enzymatically or abiotically by reaction with nitrite that forms during heterotrophic denitrification. However, it is unknown whether Fe(II)-OM complexes can be oxidized by NRFeOx. We used cell-suspension experiments with the mixotrophic nitrate-reducing Fe(II)-oxidizing bacterium Acidovorax sp...
April 19, 2018: Environmental Science & Technology
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