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https://www.readbyqxmd.com/read/29793118/efficient-resource-recycling-from-liquid-digestate-by-microalgae-yeast-mixed-culture-and-the-assessment-of-key-gene-transcription-related-to-nitrogen-assimilation-in-microalgae
#1
Lei Qin, Lu Liu, Zhongming Wang, Weining Chen, Dong Wei
To determine the feasibility of microalgae-yeast mixed culture using the liquid digestate of dairy wastewater (LDDW) for biofuels and single cell protein (SCP) production, the cell growth, nutrient removal and outputs evaluation of the mono and mixed culture of Chlorella vulgaris and Yarrowia lipolytica in LDDW were investigated by adding glycerol as carbon source. The results showed that the mixed culture could enhance the biological utilization efficiency of nitrogen and phosphorus, and obtain higher yield of biomass (1...
May 18, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29793069/a-2d-tank-test-on-remediation-of-nitrobenzene-contaminated-aquifer-using-in-situ-reactive-zone-with-emulsified-nanoscale-zero-valent-iron
#2
Jun Dong, Yang Dong, Chunyu Wen, Song Gao, Liming Ren, Qiburi Bao
Nitrobenzene (NB) is one of the most challenging pollutants for groundwater remediation due to its great harm and recalcitrance. Emulsified nanoscale zero-valent iron (EZVI) is considered as a promising agent for in-situ remediation of contaminated groundwater for its high reactivity, good durability and low cost. In this paper, 2D tank experiment was conducted to evaluate the effectiveness of enhanced remediation of NB-contaminated groundwater with EZVI. 9 L of EZVI solution was injected into aquifer to establish in-situ reactive zone (IRZ) before 40 d of NB contamination...
May 15, 2018: Chemosphere
https://www.readbyqxmd.com/read/29793040/quinones-and-nitroaromatic-compounds-as-subversive-substrates-of-staphylococcus-aureus-flavohemoglobin
#3
Myriam Moussaoui, Lina Misevičienė, Žilvinas Anusevičius, Audronė Marozienė, Florence Lederer, Laura Baciou, Narimantas Čėnas
In microorganisms, flavohemoglobins (FHbs) containing FAD and heme (Fe3+ , metHb) convert NO. into nitrate at the expense of NADH and O2 . FHbs contribute to bacterial resistance to nitrosative stress. Therefore, inhibition of FHbs functions may decrease the pathogen virulence. We report here a kinetic study of the reduction of quinones and nitroaromatic compounds by S. aureus FHb. We show that this enzyme rapidly reduces quinones and nitroaromatic compounds in a mixed single- and two-electron pathway. The reactivity of nitroaromatics increased upon an increase in their single-electron reduction potential (E1 7 ), whereas the reactivity of quinones poorly depended on their E1 7 with a strong preference for a 2-hydroxy-1,4-naphthoquinone structure...
May 21, 2018: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29792324/photochemical-formation-and-transformation-of-birnessite-effects-of-cations-on-micromorphology-and-crystal-structure
#4
Tengfei Zhang, Lihu Liu, WenFeng Tan, Steven L Suib, Guohong Qiu, Fan Liu
As important components with excellent oxidation and adsorption activity in soils and sediments, manganese oxides affect the transportation and fate of nutrients and pollutants in natural environments. In this work, birnessite was formed by photocatalytic oxidation of Mn2+aq in the presence of nitrate under solar irradiation. The effects of concentrations and species of interlayer cations (Na+, Mg2+, and K+) on birnessite crystal structure and micromorphology were investigated. The roles of adsorbed Mn2+ and pH in the transformation of the photosynthetic birnessite were further studied...
May 24, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29791881/effect-of-methane-partial-pressure-on-the-performance-of-a-membrane-biofilm-reactor-coupling-methane-dependent-denitrification-and-anammox
#5
Chen Cai, Shihu Hu, Xueming Chen, Bing-Jie Ni, Jiaoyang Pu, Zhiguo Yuan
Complete nitrogen removal has recently been demonstrated by integrating anaerobic ammonium oxidation (anammox) and denitrifying anaerobic methane oxidation (DAMO) processes. In this work, the effect of methane partial pressure on the performance of a membrane biofilm reactor (MBfR) consisting of DAMO and anammox microorganisms was evaluated. The activities of DAMO archaea and DAMO bacteria in the biofilm increased significantly with increased methane partial pressure, from 367 ± 9 and 58 ± 22 mg-N L-1 d-1 to 580 ± 12 and 222 ± 22 mg-N L-1 d-1 , respectively, while the activity of anammox bacteria only increased slightly, when the methane partial pressure was elevated from 0...
May 20, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29790340/%C3%AE-diimines-as-versatile-derivatizable-ligands-in-ruthenium-ii-p-cymene-anticancer-complexes
#6
Lorenzo Biancalana, Lucinda K Batchelor, Tiziana Funaioli, Stefano Zacchini, Marco Bortoluzzi, Guido Pampaloni, Paul J Dyson, Fabio Marchetti
α-Diimines are among the most robust and versatile ligands available in synthetic coordination chemistry, possessing finely tunable steric and electronic properties. A series of novel cationic ruthenium(II) p-cymene complexes bearing simple α-diimine ligands, [(η6 - p-cymene)RuCl{κ2 N-(HCNR)2 }]NO3 (R = Cy, [1]NO3 ; R = 4-C6 H10 OH, [2]NO3 ; R = 4-C6 H4 OH, [3]NO3 ), were prepared in near-quantitative yields as their nitrate salts. [2]NO3 displays high water solubility. The potential of the α-diimine ligand in [3]NO3 as a carrier of bioactive molecules was investigated via esterification reactions with the hydroxyl groups...
May 23, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29789796/removal-of-nitrate-in-simulated-water-at-low-temperature-by-a-novel-psychrotrophic-and-aerobic-bacterium-pseudomonas-taiwanensis-strain-j
#7
Tengxia He, Qing Ye, Quan Sun, Xi Cai, Jiupai Ni, Zhenlun Li, Deti Xie
Low temperatures and high pH generally inhibit the biodenitrification. Thus, it is important to explore the psychrotrophic and alkali-resisting microorganism for degradation of nitrogen. This research was mainly focused on the identification of a psychrotrophic strain and preliminary explored its denitrification characteristics. The new strain J was isolated using the bromothymol blue solid medium and identified as Pseudomonas taiwanensis on the basis of morphology and phospholipid fatty acid as well as 16S rRNA gene sequence analyses, which is further testified to work efficiently for removing nitrate from wastewater at low temperature circumstances...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29789462/identifying-the-driving-factors-of-water-quality-in-a-sub-watershed-of-the-republican-river-basin-kansas-usa
#8
Morgen W V Burke, Mojtaba Shahabi, Yeqian Xu, Haochi Zheng, Xiaodong Zhang, Jeffrey VanLooy
Studies have shown that the agricultural expansion and land use changes in the Midwest of the U.S. are major drivers for increased nonpoint source pollution throughout the regional river systems. In this study, we empirically examined the relationship of planted area and production of three dominant crops with nitrate flux in the Republican River, Kansas, a sub-watershed of Mississippi River Basin. Our results show that land use in the region could not explain the observed changes in nitrate flux in the river...
May 22, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29789008/pharmacological-effects-of-n-2-2-2-2-6-dichlorophenyl-amino-phenyl-acetyl-oxy-ethyl-hyaluronamide-diclofenac-etalhyaluronate-si-613-a-novel-sodium-hyaluronate-derivative-chemically-linked-with-diclofenac
#9
Keiji Yoshioka, Tomochika Kisukeda, Ryoji Zuinen, Yosuke Yasuda, Kenji Miyamoto
BACKGROUND: Osteoarthritis (OA) is the most common joint disorder worldwide and one of the leading causes of disability in the elderly. We have investigated the novel sodium hyaluronate derivative chemically linked with diclofenac (DF), diclofenac etalhyaluronate (SI-613), which is a potentially safer and more effective treatment for OA knee pain. In this study, we evaluated the pharmacological effects of SI-613 in experimental arthritis models. METHODS: We compared the analgesic and anti-inflammatory effects of intra-articularly administered SI-613, hyaluronic acid (HA), and of orally administered diclofenac sodium (DF-Na) in rat silver nitrate-induced arthritis model and rabbit antigen-induced arthritis model...
May 22, 2018: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29787677/synergistic-exposure-of-return-sludge-to-anaerobic-starvation-sulfide-and-free-ammonia-to-suppress-nitrite-oxidizing-bacteria
#10
Dries Seuntjens, Michiel Van Tendeloo, Ioanna Chatzigiannidou, Jose Carvajal-Arroyo, Sander Vandendriessche, Siegfried E Vlaeminck, Nico Boon
A key step towards energy-positive sewage treatment is the development of mainstream partial nitritation/anammox, a nitrogen removal technology where aerobic ammonium-oxidizing bacteria (AerAOB) are desired, while nitrite-oxidizing bacteria (NOB) are not. To suppress NOB, a novel return-sludge treatment was investigated. Single and combined effects of sulfide (0-600 mg S L-1), anaerobic starvation (0-8d) and a free ammonia (FA) shock (30 mg FA-N L-1 for 1h) were tested for immediate effects and long-term recovery...
May 22, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29787426/actinide-contaminated-skin-comparing-decontamination-efficacy-of-water-cleansing-gels-and-dtpa-gels
#11
A Tazrart, M A Bolzinger, S Lamart, S Coudert, J F Angulo, V Jandard, S Briançon, N M Griffiths
Skin contamination by alpha-emitting actinides is a risk to workers during nuclear fuel production and reactor decommissioning. Also, the list of items for potential use in radiological dispersal devices includes plutonium and americium. The actinide chemical form is important and solvents such as tributyl phosphate, used to extract plutonium, can influence plutonium behavior. This study investigated skin fixation and efficacy of decontamination products for these actinide forms using viable pig skin in the Franz cell diffusion system...
July 2018: Health Physics
https://www.readbyqxmd.com/read/29786913/new-insights-into-the-anion-transport-selectivity-and-mechanism-of-tren-based-tris-thio-ureas
#12
Laura Jowett, Ethan Howe, Xin Wu, Nathalie Busschaert, Philip Alan Gale
The anion transport properties of a series of previously reported tren-based anionophores have been revisited using new assays designed to measure anion uniport. This study provides new insights into the transport mechanism and selectivity of this important class of transporters. Specifically, we report the chloride and nitrate transport selectivity of these systems and quantify sulfate transport to determine EC50 values for sulfate transport for the first time. Two new assays were developed to study bicarbonate transport allowing accurate quantification of chloride/bicarbonate exchange...
May 22, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29786633/the-effect-of-nitrate-supplementation-on-exercise-tolerance-and-performance-a-systematic-review-and-meta-analysis
#13
Gavin P Van De Walle, Matthew D Vukovich
Van De Walle, GP and Vukovich, MD. The effect of nitrate supplementation on exercise tolerance and performance: a systematic review and meta-analysis. J Strength Cond Res 32(6): 1796-1808, 2018-The purpose of this article was to systematically review the current literature and evaluate the overall efficacy of nitrate supplementation on exercise tolerance and performance by meta-analysis. Studies were eligible for inclusion if they met the following criteria: (a) were an experimental trial published in an English peer-reviewed journal; (b) compared the effects of inorganic nitrate consumption with a non-bioactive supplement control or placebo; (c) used a quantifiable measure of exercise performance; and (d) was carried out in apparently healthy participants without disease...
June 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29785845/bromate-and-nitrate-bio-reduction-coupled-with-poly-%C3%AE-hydroxybutyrate-production-in-a-methane-based-membrane-biofilm-reactor
#14
Chun-Yu Lai, Pan-Long Lv, Qiu-Yi Dong, Shi Lei Yeo, Bruce E Rittmann, He-Ping Zhao
This work demonstrates bromate (BrO3-) reduction in a methane (CH4)-based membrane biofilm reactor (MBfR), and it documents contrasting impacts of nitrate (NO3-) on BrO3- reduction, as well as formation of poly--hydroxybutyrate (PHB), an internal C- and electron-storage material. When the electron donor, CH4, was in ample supply, NO3- enhanced BrO3- reduction by stimulating the growth of denitrifying bacteria (Meiothermus, Comamonadaceae, and Anaerolineaceae) able to reduce BrO3- and NO3- simultaneously...
May 22, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29785647/mrna-analysis-of-genes-encoded-with-phytochelatin-synthase-pcs-in-rice-seedlings-exposed-to-chromium-the-role-of-phytochelatins-in-cr-detoxification
#15
Xiao-Zhang Yu, Qin-Long Ling, Yan-Hong Li, Yu-Juan Lin
Transcriptional changes of genes encoded with phytochelatins synthase (PCS) was investigated in rice seedlings exposed to potassium chromate Cr(VI) or chromium nitrate Cr(III) using qRT-PCR. Our study demonstrates that both Cr variants initiated different responses of phytochelatin content and PCS activities in rice tissues. Six putative PCS genes were expressed differentially in response to both Cr species. Comparing gene expression between root/shoots, only LOC_Os05g34290.1 and LOC_Os06g01260.1 genes were expressed in similar patterns in Cr(VI) treatment, while none of them were expressed equally in Cr(III) treatments...
May 21, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29785596/biochar-reduces-nitrate-level-in-red-beet
#16
Josef Maroušek, Ladislav Kolář, Marek Vochozka, Vojtěch Stehel, Anna Maroušková
Impacts of red beet consumption both on human and animal health are subject of intense research. In particular, products that are not heat-processed contain plethora of bioactive compounds that hold promise against numerous degenerative and aging-associated diseases. However, high level of nitrates (typically more than 2 g NO3 - kg-1 ) whose health effects are perceived with reasoned objections counterbalance these benefits. Following the above, from a certain level, the increased consumption of red beet has contrary impacts, creating a limiting factor not only from the economic point of view but also in terms of beneficial compounds intake...
May 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29785503/prolonged-forearm-ischemia-attenuates-endothelium-dependent-vasodilatation-and-plasma-nitric-oxide-metabolites-in-overweight-middle-aged-men
#17
Zainie Aboo Bakkar, Jonathan Fulford, Phillip E Gates, Sarah R Jackman, Andrew M Jones, Bert Bond, Joanna L Bowtell
PURPOSE: Repeated cycles of endothelial ischemia-reperfusion injury and the resulting respiratory burst contribute to the irreversible pathophysiology of vascular diseases, and yet, the effects of ischemia reperfusion on vascular function, oxidative stress, and nitric oxide (NO) bioavailability have not been assessed simultaneously. Therefore, this study sought to examine the effects of prolonged forearm occlusion and subsequent reperfusion on NO-dependent brachial artery endothelial function...
May 21, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29784958/polycomb-repressive-complex-2-attenuates-the-very-high-expression-of-the-arabidopsis-gene-nrt2-1
#18
Fanny Bellegarde, Léo Herbert, David Séré, Erwann Caillieux, Jossia Boucherez, Cécile Fizames, François Roudier, Alain Gojon, Antoine Martin
PRC2 is a major regulator of gene expression in eukaryotes. It catalyzes the repressive chromatin mark H3K27me3, which leads to very low expression of target genes. NRT2.1, which encodes a key root nitrate transporter in Arabidopsis, is targeted by H3K27me3, but the function of PRC2 on NRT2.1 remains unclear. Here, we demonstrate that PRC2 directly targets and down-regulates NRT2.1, but in a context of very high transcription, in nutritional conditions where this gene is one of the most highly expressed genes in the transcriptome...
May 21, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29784404/evaluation-of-a-flow-through-dialysis-probe-for-sampling-and-sample-preparation-hyphenation-to-ion-chromatography
#19
Inga Markeviciute, Wolfgang Frenzel
A commercially available dialysis probe has, for the first time, been evaluated for sampling and sample preparation in combination with ion chromatography (IC). In operation the probe is immersed into the sample solution and a receiver liquid is propelled through the probe behind a suitable dialysis membrane. Small inorganic anions (fluoride, chloride, nitrite, bromide, nitrate, sulfate, phosphate) are transferred across the membrane into the receiver liquid and carried towards the injection valve of the IC system...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784357/a-sensitively-non-enzymatic-amperometric-sensor-and-its-application-in-living-cell-superoxide-anion-radical-detection
#20
Xinhe Liu, Miaomiao Ran, Guoan Liu, Xiuhui Liu, Zhonghua Xue, Xiaoquan Lu
Here, we report a nanocomposite composed of silver nanoparticles and multi-walled carbon nanotubes (AgNPs/MWNTs) utilized as an efficient electrode material for sensitive detection superoxide anion (O2 •- ). The procedure to synthesize AgNPs/MWNTs nanocomposites was green and facile. In the presence of functionalized multi-wall carbon nanotubes (MWNTs), silver nanoparticles (AgNPs) were in situ generated by chemical reduction of silver nitrate with glucose as a reducing and stabilizing agent to give the desired AgNPs/MWNTs nanocomposites...
August 15, 2018: Talanta
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