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https://www.readbyqxmd.com/read/27924432/adsorptive-properties-of-alluvial-soil-for-arsenic-v-and-its-potential-for-protection-of-the-shallow-groundwater-among-changsha-zhuzhou-and-xiangtan-cities-china
#1
Hongwei Chen, Jinhua Mei, Yueping Luo, Anni Qiu, Huan Wang
The study area is among Changsha, Zhuzhou, and Xiangtan cities, which was under agricultural use and natural conditions about 10 years ago and now is becoming part of the metropolis because of the urban expansion. This study aims to investigate the mechanisms and capabilities of the local alluvial soil layer for protecting the local shallow groundwater from arsenic pollution by field surveys and batch experiments. The field surveys showed that there was an acidic tendency of the groundwater, and phosphate, nitrate, and arsenic in the groundwater significantly increased comparing to their reference values...
December 6, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27923813/the-chemical-basis-of-thiol-addition-to-nitro-conjugated-linoleic-acid-a-protective-cell-signaling-lipid
#2
Lucia Turell, Dario A Vitturi, E Laura Coitiño, Lourdes Lebrato, Matias N Moller, Camila Sagasti, Sonia R Salvatore, Steven R Woodcock, Beatriz Alvarez, Francisco J Schopfer
Nitroalkene fatty acids are formed in vivo and exert protective and anti-inflammatory effects via reversible Michael addition to thiol-containing proteins in key signaling pathways. Nitro-conjugated linoleic acid (NO2-CLA) is preferentially formed, constitutes the most abundant nitrated fatty acid in humans and contains two carbons that could potentially react with thiols, modulating signaling actions and levels. In this work, we examined the reactions of NO2-CLA with low molecular weight thiols (glutathione, cysteine, homocysteine, cysteinylglycine and β mercaptoethanol) and human serum albumin (HSA)...
December 6, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27923576/comparison-of-heterotrophic-and-autotrophic-denitrification-processes-for-treating-nitrate-contaminated-surface-water
#3
Zheng Wang, Xiang Fei, Shengbing He, Jungchen Huang, Weili Zhou
The goal of this study was to compare the nitrogen removal rate, effluent algal growth potential (AGP), nitrous oxide (N2O) emissions and global warming potential (GWP) between two laboratory-scale bioreactors: the autotrophic denitrification biofilter (ADBF) and heterotrophic denitrification biofilter (HDBF) for treating nitrate-contaminated surface water. The comparative study of nitrogen removal rate between ADBF and HDBF was conducted by a long-term experiment, and the comparative study of the effluent AGP, N2O emissions and GWP between ADBF and HDBF were carried out by the corresponding batch tests...
December 3, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27921397/nitric-oxide-induced-by-polyamines-involves-antioxidant-systems-against-chilling-stress-in-tomato-lycopersicon-esculentum-mill-seedling
#4
Qian-Nan Diao, Yong-Jun Song, Dong-Mei Shi, Hong-Yan Qi
Polyamines (PAs) and nitric oxide (NO) are vital signals in modulating plant response to abiotic stress. However, to our knowledge, studies on the relationship between NO and PAs in response to cold stress in tomato are limited. Accordingly, in this study, we investigated the effects of putrescine (Put) and spermidine (Spd) on NO generation and the function of Spd-induced NO in the tolerance of tomato seedling under chilling stress. Spd increased NO release via the nitric oxide synthase (NOS)-like and nitrate reductase (NR) enzymatic pathways in the seedlings, whereas Put had no such effect...
2016: Journal of Zhejiang University. Science. B
https://www.readbyqxmd.com/read/27921261/attempting-to-compensate-for-reduced-neuronal-nitric-oxide-synthase-protein-with-nitrate-supplementation-cannot-overcome-metabolic-dysfunction-but-rather-has-detrimental-effects-in-dystrophin-deficient-mdx-muscle
#5
Cara A Timpani, Adam J Trewin, Vanesa Stojanovska, Ainsley Robinson, Craig A Goodman, Kulmira Nurgali, Andrew C Betik, Nigel Stepto, Alan Hayes, Glenn K McConell, Emma Rybalka
Duchenne muscular dystrophy arises from the loss of dystrophin and is characterized by calcium dysregulation, muscular atrophy, and metabolic dysfunction. The secondary reduction of neuronal nitric oxide synthase (nNOS) from the sarcolemma reduces NO production and bioavailability. As NO modulates glucose uptake, metabolism, and mitochondrial bioenergetics, we investigated whether an 8-week nitrate supplementation regimen could overcome metabolic dysfunction in the mdx mouse. Dystrophin-positive control (C57BL/10) and dystrophin-deficient mdx mice were supplemented with sodium nitrate (85 mg/l) in drinking water...
December 5, 2016: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
https://www.readbyqxmd.com/read/27920768/the-shifts-of-diazotrophic-communities-in-spring-and-summer-associated-with-coral-galaxea-astreata-pavona-decussata-and-porites-lutea
#6
Yanying Zhang, Qingsong Yang, Juan Ling, Joy D Van Nostrand, Zhou Shi, Jizhong Zhou, Junde Dong
The coral holobiont often resides in oligotrophic waters; both coral cells and their symbiotic dinoflagellates possess ammonium assimilation enzymes and potentially benefit from the nitrogen fixation of coral-associated diazotrophs. However, the seasonal dynamics of coral-associated diazotrophs are not well characterized. Here, the seasonal variations of diazotrophic communities associated with three corals, Galaxea astreata, Pavona decussata, and Porites lutea, were studied using nifH gene amplicon pyrosequencing techniques...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27918944/groundwater-nitrate-pollution-and-human-health-risk-assessment-by-using-hhra-model-in-an-agricultural-area-ne-china
#7
Yuanzheng Zhai, Xiaobing Zhao, Yanguo Teng, Xiao Li, Junjun Zhang, Jin Wu, Rui Zuo
In order to learn the pollution circumstance of groundwater nitrate detailedly in Songnen Plain of Northeast China and estimate its potential risk to human health of local residents, a total of 389 groundwater samples were collected in 2014 and studied from residential areas and public water supply wells in 11 cities and counties in southeastern of Songnen Plain. The analysis results showed that the spatial distributions of main chemical components in groundwater had great variations with statistical concentrations in the order of TDS> HCO3> Ca> NO3> Cl> Na> SO4> Mg> K> NH4> NO2...
December 1, 2016: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/27918615/top-down-control-of-methane-emission-and-nitrogen-cycling-by-waterfowl
#8
R Scott Winton, Curtis J Richardson
Aquatic herbivores impose top-down control on the structure of wetland ecosystems, but the biogeochemical consequences of herbivory on methane (CH4 ) and nitrogen (N) are poorly known. To investigate the top-down effects of waterfowl on wetland biogeochemistry, we implemented exclosure experiments in a major waterfowl overwintering wetland in the southeastern United States over two growing seasons. We found that herbivory inhibited the oxidation of CH4 , leading to a mean increase in emission by 230% over control plots, and prevented nitrification, as indicated by low nitrate availability and undetectable emissions of nitrous oxide...
November 4, 2016: Ecology
https://www.readbyqxmd.com/read/27918294/synthesis-and-characterization-of-a-cadmium-ii-organic-supramolecular-coordination-compound-based-on-the-multifunctional-2-amino-5-sulfobenzoic-acid-ligand
#9
Gan Yin Yuan, Lei Zhang, Meng Jie Wang, Kou Lin Zhang
Much attention has been paid by chemists to the construction of supramolecular coordination compounds based on the multifunctional ligand 5-sulfosalicylic acid (H3SSA) due to the structural and biological interest of these compounds. However, no coordination compounds have been reported for the multifunctional amino-substituted sulfobenzoate ligand 2-amino-5-sulfobenzoic acid (H2asba). We expected that H2asba could be a suitable building block for the assembly of supramolecular networks due to its interesting structural characteristics...
December 1, 2016: Acta Crystallographica. Section C, Structural Chemistry
https://www.readbyqxmd.com/read/27916958/catalytic-performance-of-a-new-1d-cu-ii-coordination-polymer-cu-no%C3%A2-h%C3%A2-o-htae-4-4-bpy-for-knoevenagel-condensation
#10
Edurne S Larrea, Roberto Fernández de Luis, María I Arriortua
The {Cu(NO₃)(H₂O)}(HTae)(4,4'-Bpy) (H₂Tae = 1,1,2,2-tetraacetylethane, 4,4'-Bpy = 4,4'-Dipyridyl) 1D coordination polymer has been obtained by slow evaporation. The crystal structure consists of parallel and oblique {Cu(HTae)(4,4'-Bpy)} zig-zag metal-organic chains stacked along the [100] crystallographic direction. Copper(II) ions are in octahedral coordination environment linked to two nitrogen atoms of two bridging 4,4'-Bpy and to two oxygen atoms of one HTae molecule in the equatorial plane. The occupation of the axial positions varies from one copper atom to another, with different combinations of water molecules and nitrate anions, giving rise to a commensurate super-structure...
December 1, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27916719/syringe-test-screening-of-microbial-gas-production-activity-cases-denitrification-and-biogas-formation
#11
Kjetill Østgaard, Viktoria Kowarz, Wang Shuai, Ingrid A Henry, Michal Sposob, Hildegunn Hegna Haugen, Rune Bakke
Mass produced plastic syringes may be applied as vessels for cheap, simple and large scale batch culture testing. As illustrated for the cases of denitrification and of biogas formation, metabolic activity was monitored by direct reading of the piston movement due to the gas volume formed. Pressure buildup due to friction was shown to be moderate. A piston pull and slide back routine can be applied before recording gas volume to minimize experimental errors due to friction. Inoculum handling and activity may be conveniently standardized as illustrated by applying biofilm carriers...
December 1, 2016: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/27916563/vitamin-c-intake-modify-the-impact-of-dietary-nitrite-on-the-incidence-of-type-2-diabetes-a-6-year-follow-up-in-tehran-lipid-and-glucose-study
#12
Zahra Bahadoran, Parvin Mirmiran, Asghar Ghasemi, Mattias Carlström, Fereidoun Azizi, Farzad Hadaegh
BACKGROUND: There is no epidemiological study on the association between dietary nitrate (NO3) and nitrite (NO2) and intakes and the risk of type 2 diabetes (T2D). OBJECTIVE: The aim of this study was therefore to examine the potential effect of dietary NO3 and NO2 on the occurrence of T2D. DESIGN: This longitudinal study was conducted within the framework of the Tehran Lipid and Glucose Study (TLGS) on 2139 T2D-free adults, aged 20-70 years, followed for a median of 5...
December 1, 2016: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/27916273/identification-of-agnors-and-cytopathological-changes-in-oral-lichen-planus-lesions
#13
Stefânia Jeronimo Ferreira, Maria Ângela Naval Machado, Antônio Adilson Soares de Lima, Aline Cristina Batista Rodrigues Johann, Ana Maria Trindade Grégio, Luciana Reis Azevedo-Alanis
OBJECTIVE: To evaluate cytopathological changes in epithelial cells of the oral mucosa of patients with oral lichen planus (OLP) compared with patients without OLP. SUBJECTS AND METHODS: Swabs were collected from the oral mucosa of 20 patients with OLP (case group) and 20 patients without OLP (control group) using liquid-based cytology. After Papanicolaou staining, the smears were characterized based on Papanicolaou classification and degree of maturation. Nuclear area (NA) measurements, cytoplasmic area (CA) measurements, and the NA/CA ratio were determined from 50 epithelial cells per slide...
December 1, 2016: Acta Histochemica
https://www.readbyqxmd.com/read/27916129/application-of-a-macrocyclic-compound-bambus-6-uril-in-tailor-made-liquid-membranes-for-highly-selective-electromembrane-extractions-of-inorganic-anions
#14
Andrea Šlampová, Vladimír Šindelář, Pavel Kubáň
A tailor-made liquid membrane consisting of a resistive organic solvent (nitrobenzene, NB) and a highly selective non-ionic macrocyclic compound (bambus[6]uril, BU6) was employed for electromembrane extraction (EME) of inorganic anions. BU6 facilitates strong host-guest interactions of its internal cavity with selected inorganic anions only and its presence in the liquid membrane ensured excellent selectivity of the EME process. EME transfers were directly related to association constants between BU6 and inorganic anions and nearly absolute selectivity was achieved for EMEs of iodide, bromide and perchlorate...
January 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27915453/effects-of-chronic-nitric-oxide-synthase-inhibition-on-v-o2max-and-exercise-capacity-in-mice
#15
M Wojewoda, K Przyborowski, B Sitek, A Zakrzewska, L Mateuszuk, J A Zoladz, S Chlopicki
Acute inhibition of NOS by L-NAME (N(ω)-nitro-L-arginine methyl ester) is known to decrease maximal oxygen consumption (V'O2max) and impair maximal exercise capacity, whereas the effects of chronic L-NAME treatment on V'O2max and exercise performance have not been studied so far. In this study, we analysed the effect of L-NAME treatment, (LN2 and LN12, respectively) on V'O2max and exercise capacity (in maximal incremental running and prolonged sub-maximal incremental running tests), systemic NO bioavailability (plasma nitrite (NO2(-)) and nitrate (NO3(-))) and prostacyclin (PGI2) production in C57BL6/J mice...
December 3, 2016: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/27915250/importance-of-fumarate-and-nitrate-reduction-regulatory-protein-for-proliferation-for-intestinal-proliferation-of-vibrio-vulnificus
#16
Takehiro Kado, Takashige Kashimoto, Kohei Yamazaki, Shunji Ueno
The sepsis caused by Vibrio vulnificus is characterized by an average incubation period of 26 hours and a high mortality rate exceeding 50%. The fast growth and dissemination of V. vulnificus in vivo lead to poor clinical outcomes in patients. Therefore, elucidation of the proliferation mechanisms of this organism in vivo may lead to development of an effective therapeutic strategy. In this study, we focused on the low oxygen concentration in the intestinal milieu because of its drastic difference from that in the air...
December 2, 2016: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/27914783/achievement-of-high-nitrite-accumulation-via-endogenous-partial-denitrification-epd
#17
Jiantao Ji, Yongzhen Peng, Bo Wang, Shuying Wang
This study proposed a novel strategy for achievement of partial denitrification driven by endogenous carbon sources in an anaerobic/anoxic/aerobic activated sludge system. Results showed that in the steady-stage, the nitrate-to-nitrite transformation ratio (NTR) was kept at around 87% without nitrate in the effluent. During the anaerobic period, exogenous carbon sources was completely taken up, accompanied by the consumption of glycogen and production of polyhydroxyalkanoates (PHAs). During the anoxic period, nitrate was reduced to nitrite by using PHAs as carbon sources, followed by the replenishment of glycogen...
November 19, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27914726/removal-of-2-mib-and-geosmin-by-electrogenerated-persulfate-performance-mechanism-and-pathways
#18
Lingjun Bu, Shiqing Zhou, Zhou Shi, Lin Deng, Naiyun Gao
In this study, the degradation of 2-methylisoborneol (2-MIB) and geosmin (GSM) was evaluated by electrochemical oxidation (EO) using boron-doped diamond (BDD) electrode. Both 2-MIB and GSM could be degraded efficiently in sulfate electrolyte compared to inert nitrate or perchlorate electrolytes, implying that in-situ generated persulfate may be responsible for contaminants degradation. The observed linear relationship between 2-MIB (GSM) degradation rates and persulfate generation rates further proved that the in-situ generated persulfate enhanced 2-MIB (GSM) degradation...
November 30, 2016: Chemosphere
https://www.readbyqxmd.com/read/27914646/in-the-eye-of-the-beholder-assessing-the-water-quality-of-shoreline-parks-around-the-island-of-montreal-through-citizen-science
#19
D Lévesque, A Cattaneo, G Deschamps, C Hudon
As a part of the FreshWater Watch project aiming to promote volunteers' water monitoring in 25 cities around the world, St. Lawrence River water quality was characterized at 28 public shoreline parks around Montreal Island, Quebec, Canada. This involved training of 69 citizen scientists by researchers of the Université de Montréal in five one-day sessions. Shoreline sampling yielded 174 data points over three summers (May 2013 to November 2015). Water turbidity, nitrate and phosphate concentrations were measured in situ, together with the thickness and type of beach-cast vegetation, and the relative abundance of different types of beach litter...
November 30, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27912902/evolution-of-the-clinical-profile-of-patients-with-acute-heart-failure-treated-in-spanish-emergency-departments
#20
R Escoda, Ò Miró, F J Martín-Sánchez, J Jacob, P Herrero, V Gil, J M Garrido, M J Pérez-Durá, M Fuentes, P Llorens
OBJECTIVE: To analyse the changes in epidemiology, outpatient and emergency department clinical care, and outcomes of patients treated for acute heart failure (AHF) in Spanish hospital emergency departments (HEDs) between 2007 and 2014. METHOD: A multicentre cohort study was conducted that consecutively included patients with AHF diagnosed in 9HEDs during 4 periods (2007, 2009, 2011 and 2014). The study analysed the changes observed in 20 variables corresponding to baseline data, outpatient care and emergency care data and outcome data...
November 29, 2016: Revista Clínica Española
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