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https://www.readbyqxmd.com/read/29775933/observing-hno-3-release-dependent-upon-metal-complexes-in-malonic-acid-nitrate-droplets
#1
Xu Shao, Feng-Min Wu, Hui Yang, Shu-Feng Pang, Yun-Hong Zhang
Although the dicarboxylic acid has been reported to react with nitrate for aged internally mixed aerosols in atmosphere, the quantitative nitrate depletion dependent upon composition in particles is still not well constrained. The chemical composition evolutions for malonic acid/sodium nitrate (MA/SN), malonic acid/magnesium nitrate (MA/MN) and malonic acid/calcium nitrate (MA/CN) particles with the organic to inorganic molar ratio (OIR) of 1:1 are investigated by vacuum Fourier transform infrared spectroscopy (FTIR)...
May 9, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29775929/negative-impacts-of-elevated-nitrate-on-physiological-performance-are-not-exacerbated-by-low-ph
#2
Daniel F Gomez Isaza, Rebecca L Cramp, Craig E Franklin
Multiple environmental stressors, including nutrient effluents (i.e. nitrates [NO3 - ]) and altered pH regimes, influence the persistence of freshwater species in anthropogenically disturbed habitats. Independently, nitrate and low pH affect energy allocation by increasing maintenance costs and disrupting oxygen uptake, which ultimately results in impacts upon whole animal performance. However, the interaction between these two stressors has not been characterised. To address this, the effects of nitrate and pH and their interaction on aerobic scope and physiological performance were investigated in the blueclaw crayfish, Cherax destructor...
May 15, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29775906/bioaugmentation-with-diaphorobacter-polyhydroxybutyrativorans-to-enhance-nitrate-removal-in-a-poly-3-hydroxybutyrate-co-3-hydroxyvalerate-supported-denitrification-reactor
#3
Shusong Zhang, Xingbin Sun, Xuming Wang, Tianlei Qiu, Min Gao, Yanmei Sun, Shoutao Cheng, Qingjing Zhang
A newly isolated and identified Diaphorobacter polyhydroxybutyrativorans strain (SL-205) was employed to enhance the denitrification performance of a laboratory-scale solid-phase denitrification (SPD) reactor using poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) as a carbon source, and dynamic variations in microbial communities in the reactor were investigated. Results indicated that bioaugmentation with strain SL-205 enabled rapid reactor startup and improved denitrification performance relative to the reactor inoculated with activated sludge...
May 9, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29775547/acute-dietary-nitrate-supplementation-does-not-attenuate-oxidative-stress-or-the-hemodynamic-response-during-submaximal-exercise-in-hypobaric-hypoxia
#4
Colin R Carriker, Paige Rombach, Brooke M Stevens, Roger A Vaughan, Ann L Gibson
PURPOSE: To investigate changes in oxidative stress, arterial oxygen saturation (SaO2), blood pressure (BP), and heart rate (HR) while exercising in hypobaric hypoxia following acute dietary nitrate supplementation. METHODS: Nine well-trained (60.8±7.8 ml/kg/min) males (29±7 years) visited the lab on 3 occasions, each separated by 1 week. Visit 1 included a maximal aerobic cycling test (VO2max) and 5 five-minute increasing intensity exercise bouts in a normobaric environment (1600m)...
May 18, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29775291/reactive-uptake-of-glyoxal-by-ammonium-containing-salt-particles-as-a-function-of-relative-humidity
#5
Masao Gen, Dandan Huang, Chak Keung Chan
Reactions between dissolved ammonia and carbonyls, which form light-absorbing species in atmospheric particles, can be accelerated by actively removing water from the reaction system. Here, we examine the effects of relative humidity (RH) on the reactive uptake of glyoxal (Gly) by aqueous particles of ammonium sulfate (AS), ammonium bisulfate, sodium sulfate, magnesium sulfate, ammonium nitrate (AN), and sodium nitrate. In-situ Raman analysis was used to quantify particle-phase Gly and a colored product, 2,2'-biimidazole (BI) as a function of uptake time...
May 18, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29775287/computational-prediction-and-analysis-for-tyrosine-post-translational-modifications-via-elastic-net
#6
Man Cao, Guodong Chen, Lina Wang, Pingping Wen, Shaoping Shi
The tyrosine residue has been identified as suffering three major post-translational modifications (PTMs) including nitration, sulfation, and phosphorylation, which could be involved in different physiological and pathological processes. Multiple tyrosine residues of the whole protein may be modified concurrently, where PTM of a single tyrosine may affect modification of other neighboring tyrosine residues. Hence, it is significant and beneficial to predict nitration, sulfation, and phosphorylation of tyrosine residues in the whole protein sequence...
May 18, 2018: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/29775122/nitration-of-mnsod-in-the-carotid-body-and-adrenal-gland-induced-by-chronic-intermittent-hypoxia
#7
Esteban A Moya, Paulina Arias, Rodrigo Iturriaga
Chronic intermittent hypoxia (CIH), main feature of obstructive sleep apnea, produces nitro-oxidative stress, which contributes to potentiate carotid body (CB) chemosensory discharges and sympathetic-adrenal-axis activity, leading to hypertension. The MnSOD enzymatic activity, a key enzyme on oxidative stress control, is reduced by superoxide-induced nitration. However, the effects of CIH-induced nitration on MnSOD enzymatic activity in the CB and adrenal gland are not known. We studied the effects of CIH on MnSOD protein and immunoreactive (MnSOD-ir) levels in the CB, adrenal gland and superior cervical ganglion (SCG), and on 3-nitrotyrosine (3-NT-ir), CuZnSOD (CuZnSOD-ir), MnSOD nitration, and its enzymatic activity in the CB and adrenal gland from male Sprague-Dawley rats exposed to CIH for 7 days...
May 1, 2018: Journal of Histochemistry and Cytochemistry: Official Journal of the Histochemistry Society
https://www.readbyqxmd.com/read/29774049/bioreactor-microbial-ecosystems-with-differentiated-methanogenic-phenol-biodegradation-and-competitive-metabolic-pathways-unraveled-with-genome-resolved-metagenomics
#8
Feng Ju, Yubo Wang, Tong Zhang
Background: Methanogenic biodegradation of aromatic compounds depends on syntrophic metabolism. However, metabolic enzymes and pathways of uncultured microorganisms and their ecological interactions with methanogenic consortia are unknown because of their resistance to isolation and limited genomic information. Results: Genome-resolved metagenomics approaches were used to reconstruct and dissect 23 prokaryotic genomes from 37 and 20 °C methanogenic phenol-degrading reactors...
2018: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/29773178/evaluation-of-changes-in-the-macro-and-micronutrients-homeostasis-of-transgenic-and-non-transgenic-soybean-plants-after-cultivation-with-silver-nanoparticles-through-ionomic-approaches
#9
Rodrigo Moretto Galazzi, Marco Aurélio Zezzi Arruda
An ionomic approach is conducted for evaluating the silver distribution, in different soybean plant compartments, as well as its influence on the homeostasis of some macro (P and S) and micro (Cu, Fe, Mn and Zn) nutrients. Silver is added to transgenic and non-transgenic soybean plants as nanoparticles or silver nitrate for comparative purposes. The transgenic plants translocate a higher amount of silver (100 and 65% for silver nanoparticles and silver nitrate expositions, respectively) than non-transgenic, and considering the treatments, the cultivation with silver nanoparticles results in a higher translocation rate (100 and 21% for transgenic and non-transgenic plants, respectively)...
July 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29772167/dynamic-oxidative-potential-of-atmospheric-organic-aerosol-under-ambient-sunlight
#10
Huanhuan Jiang, Myoseon Jang
The atmospheric process dynamically changes the chemical compositions of organic aerosol (OA), thereby complicating the interpretation of its health effects. In this study, the dynamic evolution of the oxidative potential of various OA was studied, including wood combustion particles and secondary organic aerosols (SOA) generated from different hydrocarbons (i.e. gasoline, toluene, isoprene and α-pinene). The oxidative potential of OA at different aging stages was subsequently measured by the dithiothreitol consumption (DTTm, mass normalized)...
May 17, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29771915/inactivation-of-bpsl1039-1040-atp-binding-cassette-transporter-reduces-intracellular-survival-in-macrophages-biofilm-formation-and-virulence-in-the-murine-model-of-burkholderia-pseudomallei-infection
#11
Peechanika Pinweha, Pornpan Pumirat, Jon Cuccui, Niramol Jitprasutwit, Veerachat Muangsombut, Varintip Srinon, Usa Boonyuen, Parameth Thiennimitr, Paiboon Vattanaviboon, Felipe Cia, Sam Willcocks, Gregory J Bancroft, Brendan W Wren, Sunee Korbsrisate
Burkholderia pseudomallei, a gram-negative intracellular bacillus, is the causative agent of a tropical infectious disease called melioidosis. Bacterial ATP-binding cassette (ABC) transporters import and export a variety of molecules across bacterial cell membranes. At present, their significance in B. pseudomallei pathogenesis is poorly understood. We report here characterization of the BPSL1039-1040 ABC transporter. B. pseudomallei cultured in M9 medium supplemented with nitrate, demonstrated that BPSL1039-1040 is involved in nitrate transport for B...
2018: PloS One
https://www.readbyqxmd.com/read/29771316/toluene-degradation-by-cupriavidus-metallidurans-ch34-in-nitrate-reducing-conditions-and-in-bioelectrochemical-systems
#12
Anna Espinoza Tofalos, Matteo Daghio, Myriam González, Maddalena Papacchini, Andrea Franzetti, Michael Seeger
Bioelectrochemical remediation of hydrocarbons is a technology that exploits the ability of specific microorganisms to use as electron acceptor an electrode, thus potentially lowering the operational costs related to classical bioremediation. Several well-characterized hydrocarbonoclastic strains might be electroactive, thus their biodegradation performances in Bioelectrochemical Systems should be studied. Cupriavidus metallidurans CH34 is a model metal-resistant strain whose capacity to degrade benzene aerobically has recently been described...
May 16, 2018: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/29769540/different-clusters-of-candidatus-methanoperedens-nitroreducens-like-archaea-as-revealed-by-high-throughput-sequencing-with-new-primers
#13
Sai Xu, Chen Cai, Jianhua Guo, Wenjing Lu, Zhiguo Yuan, Shihu Hu
The newly discovered Candidatus 'Methanoperedens nitroreducens' (M. nitroreducens), mediating nitrate-dependent anaerobic oxidation of methane, is an important microorganism in linking carbon and nitrogen cycles. In order to explore the diversity of M. nitroreducens-like archaea in various environmental niches with advanced high-throughput sequencing, new primers based on alpha subunit of methyl-coenzyme M reductase gene were designed. The PCR results demonstrated that the new primers could effectively detect M...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29769381/tosr-mediated-regulation-of-adhesins-and-biofilm-formation-in-uropathogenic-escherichia-coli
#14
Courtney L Luterbach, Valerie S Forsyth, Michael D Engstrom, Harry L T Mobley
Uropathogenic Escherichia coli strains utilize a variety of adherence factors that assist in colonization of the host urinary tract. TosA (<u>t</u>ype <u>o</u>ne <u>s</u>ecretion <u>A</u>) is a nonfimbrial adhesin that is predominately expressed during murine urinary tract infection (UTI), binds to kidney epithelial cells, and promotes survival during invasive infections. The tosRCBDAEF operon encodes the secretory machinery necessary for TosA localization to the E...
June 27, 2018: MSphere
https://www.readbyqxmd.com/read/29769113/thinking-beyond-opisthorchis-viverrini-for-risk-of-cholangiocarcinoma-in-the-lower-mekong-region-a-systematic-review-and-meta-analysis
#15
REVIEW
Jennifer A Steele, Carsten H Richter, Pierre Echaubard, Parichat Saenna, Virginia Stout, Paiboon Sithithaworn, Bruce A Wilcox
BACKGROUND: Cholangiocarcinoma (CCA) is a fatal bile duct cancer associated with infection by the liver fluke, Opisthorchis viverrini, in the lower Mekong region. Numerous public health interventions have focused on reducing exposure to O. viverrini, but incidence of CCA in the region remains high. While this may indicate the inefficacy of public health interventions due to complex social and cultural factors, it may further indicate other risk factors or interactions with the parasite are important in pathogenesis of CCA...
May 17, 2018: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/29768855/facile-synthesis-and-characterization-of-zro%C3%A2-nanoparticles-via-modified-co-precipitation-method
#16
M Ramachandran, R Subadevi, Wei-Ren Liu, M Sivakumar
The crystalline Zirconium oxide (ZrO2) nano particles were synthesized using optimized content of Zirconium nitrate (Zr(NO3)2·3H2O) with varying KOH concentration (0.5, 1 and 1.5 M) by co-precipitation method. The thermal history of the precursor was carefully analyzed through Thermogravimetric (TG/DTA) measurement. The as prepared samples were characterized to ensure structural, functional, morphological, compositional, chemical composition and band gap by X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), Laser Raman, scanning electron microscopy (SEM), High resolution Transverse Electron Microscopy (HR-TEM), X-ray photo electron spectroscopy (XPS), EDX, Photo luminescence spectroscopy (PL)...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29768452/tyrosine-nitration-of-cytosolic-peroxidase-is-probably-triggered-as-a-long-distance-signaling-response-in-sunflower-seedling-cotyledons-subjected-to-salt-stress
#17
Prachi Jain, Satish C Bhatla
Present work focuses on tissue and concentration-dependent effect of nitric oxide (NO) on the modulation of cytosolic peroxidase (POD; EC 1.11.1.7) activity in 2-day old etiolated sunflower (Helianthus annuus L.) seedlings. Exogenously supplied NO (in the form of sodium nitroprusside [SNP] or diethylenetriamine NONOate [DETA]; 125 to 500 μM) results in noteworthy enhancement in seedling growth in a concentration dependent manner irrespective of salt-stress and differentially affects POD activity in 2-day old seedling cotyledons...
2018: PloS One
https://www.readbyqxmd.com/read/29768227/dual-application-of-shewanella-oneidensis-mr-1-in-green-biosynthesis-of-pd-nanoparticles-supported-on-tio-2-nanotubes-and-assisted-photocatalytic-degradation-of-methylene-blue
#18
Xiaojie Song, Xianyang Shi, Mi Yang
Biosynthesised nanocomposites have attracted growing interests attributed to their 'green' synthesis nature in recent years. Shewanella oneidensis MR-1, a dissimilatory metal-reducing bacterium, was used to reduce palladium (II) nitrate to palladium (0) nanoparticles (Pd NPs) under anaerobic conditions, resulting in the in situ formation of Pd NPs immobilised on TiO2 nanotubes (TNTs) (Pd/TNTs nanocomposites). The Pd/TNTs nanocomposites were characterised by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, energy dispersive X-ray, and electron spin resonance, respectively...
June 2018: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29768222/green-synthesis-of-silver-nanoparticles-using-flower-extract-of-malva-sylvestris-and-investigation-of-their-antibacterial-activity
#19
Hassan Mahmoodi Esfanddarani, Abolghasem Abbasi Kajani, Abdol-Khalegh Bordbar
High-quality colloidal silver nanoparticles (AgNP) were synthesised via a green approach by using hydroalcoholic extracts of Malva sylvestris . Silver nitrate was used as a substrate ion while the plant extract successfully played the role of reducing and stabilising agents. The synthesised nanoparticles were carefully characterised by using transmission electron microscopy, atomic-force microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy and UV-vis spectroscopy. The maximum absorption wavelengths of the colloidal solutions synthesised using 70 and 96% ethanol and 100% methanol, as extraction solvents, were 430, 485 and 504 nm, respectively...
June 2018: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29767980/hno-3-hfip-a-nitrating-system-for-arenes-with-direct-observation-of-%C3%AF-complex-intermediates
#20
Le Lu, Huixin Liu, Ruimao Hua
This report describes an efficient nitrating system for the nitration of arenes at room temperature by using an equivalent of nitric acid in HFIP (1,1,1,3,3,3-hexafluoroisopropanol). The π-complex intermediate of an arene with a nitronium ion stabilized by HFIP can be directly observed by UV-vis spectra and is supported by theoretical calculations.
May 16, 2018: Organic Letters
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