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https://www.readbyqxmd.com/read/29145113/denitrification-behavior-and-microbial-community-spatial-distribution-inside-woodchip-based-solid-phase-denitrification-w-spd-bioreactor-for-nitrate-contaminated-water-treatment
#1
Jiamin Zhao, Chuanping Feng, Shuang Tong, Nan Chen, Shanshan Dong, Tong Peng, Shunlong Jin
The NO3(-) removal pathway and microorganisms change along with the height of an up-flow W-SPD bioreactor was investigated in this study. Modeling and microbial community analysis were used to analyze the denitrification behavior in W-SPD bioreactor. The results showed that NO3(-) removal rate matched for zero-order (R(2) > 0.97) and first-order (R(2) > 0.94) combination Michaelis-Menten kinetics, whereas microbial reaction rate suited for modified logistic model (R(2) > 0.99). The excellent denitrification performance (92...
November 6, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29143297/impact-of-trimetazidine-treatment-on-5-year-clinical-outcomes-in-patients-with-significant-coronary-artery-spasm-a-propensity-score-matching-study
#2
Yong Hoon Kim, Ae-Young Her, Seung-Woon Rha, Byoung Geol Choi, Se Yeon Choi, Jae Kyeong Byun, Ahmed Mashaly, Yoonjee Park, Won Young Jang, Woohyeun Kim, Jah Yeon Choi, Eun Jin Park, Jin Oh Na, Cheol Ung Choi, Hong Euy Lim, Eung Ju Kim, Chang Gyu Park, Hong Seog Seo, Dong Joo Oh
OBJECTIVE: We aimed to evaluate the additive benefit of trimetazidine with well-known antispasmodic agents such as calcium channel blockers and nitrate in patients with significant coronary artery spasm (CAS) as assessed by acetylcholine provocation test up to 5 years. METHODS: A total 1727 patients with significant CAS were enrolled. They were divided into two groups: a trimetazidine group (trimetazidine, diltiazem, and nitrate, n = 695), and control group (diltiazem and nitrate, n = 473)...
November 15, 2017: American Journal of Cardiovascular Drugs: Drugs, Devices, and Other Interventions
https://www.readbyqxmd.com/read/29143202/tobacco-plants-expressing-the-maize-nitrate-transporter-zmnrt2-1-exhibit-altered-responses-of-growth-and-gene-expression-to-nitrate-and-calcium
#3
Abubakar Ibrahim, Xiao-Lu Jin, Yu-Bin Zhang, Jessica Cruz, Paveena Vichyavichien, Nwadiuto Esiobu, Xing-Hai Zhang
BACKGROUND: Nitrate uptake is a highly regulated process. Understanding the intricate interactions between nitrate availability and genetically-controlled nitrate acquisition and metabolism is essential for improving nitrogen use efficiency and increasing nitrate uptake capacity for plants grown in both nitrate-poor and nitrate-enriched environments. In this report, we introduced into tobacco (Nicotiana tabacum) the constitutively expressed maize high-affinity transporter ZmNrt2.1 gene that would bypass the tight control for the endogenous nitrate-responsive genes...
November 15, 2017: Botanical Studies (Taipei, Taiwan)
https://www.readbyqxmd.com/read/29143039/copper-nitrate-catalyzed-oxidative-coupling-of-unactivated-c-sp-3-h-bonds-of-ethers-and-alkanes-with-n-hydroxyphthalimide-synthesis-of-n-hydroxyimide-esters
#4
Xiaohe Xu, Jian Sun, Yuyan Lin, Jingya Cheng, Pingping Li, Yiyan Yan, Qi Shuai, Yuanyuan Xie
A copper nitrate-catalyzed cross-dehydrogenative coupling reaction between N-hydroxyphthalimide (NHPI) and ethers/alkanes has been described. The reaction is accomplished smoothly by using simple and green molecular oxygen as the oxidant, providing an alternative for the efficient synthesis of N-alkoxyphthalimides. In addition, it was found that when tert-butyl ethers were used as substrates, unexpected N-hydroxyimide ester derivatives were obtained in moderate to excellent yields. To further understand this unusual transformation, control experiments were performed and a plausible mechanism was proposed...
November 16, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29141968/the-nitrate-independent-blood-pressure-lowering-effect-of-beetroot-juice-a-systematic-review-and-meta-analysis
#5
REVIEW
Zahra Bahadoran, Parvin Mirmiran, Ali Kabir, Fereidoun Azizi, Asghar Ghasemi
Beetroot is considered a complementary treatment for hypertension because of its high content of inorganic NO3 This systematic review and meta-analysis aimed to clarify several aspects of beetroot juice supplementation on systolic blood pressure (SBP) and diastolic blood pressure (DBP). We searched PubMed, Scopus, and Embase databases, and the reference lists of previous reviews. Randomized clinical trials that investigated the effects of beetroot juice on resting blood pressure in humans were recruited for quality assessment, meta-analyses, subgroup analyses, and meta-regressions; of these, 22 were conducted between 2009 and 2017 and included a total of 47 intervention (n = 650) and 43 control (n = 598) groups...
November 2017: Advances in Nutrition
https://www.readbyqxmd.com/read/29140076/direct-analysis-of-lignin-phenols-in-freshwater-dissolved-organic-matter
#6
Hendrik Reuter, Julia Gensel, Marcus Elvert, Dominik Zak
A novel approach for the analysis of dissolved lignin in freshwaters is presented. Lignin concentrations in natural waters are low and a lignin extraction is usually required to obtain sufficient sample for analysis. In this method, extraction and dry down of the dissolved lignin are omitted and alkaline CuO oxidation is directly performed using 15 mL water sample in a microwave digestion system, thus reducing the required amount of sample and its preparation time considerably. Low procedural blank values are obtained by solid phase extraction (SPE) of the oxidized lignin phenols on HLB sorbents...
November 15, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29139077/spatiotemporal-patterns-and-source-attribution-of-nitrogen-pollution-in-a-typical-headwater-agricultural-watershed-in-southeastern-china
#7
Wenjun Chen, Bin He, Daniel Nover, Weili Duan, Chuan Luo, Kaiyan Zhao, Wen Chen
Excessive nitrogen (N) discharge from agriculture causes widespread problems in aquatic ecosystems. Knowledge of spatiotemporal patterns and source attribution of N pollution is critical for nutrient management programs but is poorly studied in headwaters with various small water bodies and mini-point pollution sources. Taking a typical small watershed in the low mountains of Southeastern China as an example, N pollution and source attribution were studied for a multipond system around a village using the Hydrological Simulation Program-Fortran (HSPF) model...
November 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29139074/excessive-use-of-nitrogenous-fertilizers-an-unawareness-causing-serious-threats-to-environment-and-human-health
#8
Moddassir Ahmed, Muhammad Rauf, Zahid Mukhtar, Nasir Ahmad Saeed
Farmers occasionally need to add nitrogen fertilizer to their farms and gardens to make available just the precise nutrients for their plants' growth. The applications of inorganic nitrogen fertilizers to various crops have been continuously increasing since last many decades globally. Although nitrogen fertilizer contributes substantially to yield enhancement, but excessive use of this manure has posed serious threats to environment and human health. Rate of nitrogen fertilizers application has a close relationship with nitrate accumulation in surrounding environment, groundwater, as well as leafy and root vegetables...
November 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29138675/benign-effect-of-extremely-low-frequency-electromagnetic-field-on-brain-plasticity-assessed-by-nitric-oxide-metabolism-during-poststroke-rehabilitation
#9
Natalia Cichoń, Piotr Czarny, Michał Bijak, Elżbieta Miller, Tomasz Śliwiński, Janusz Szemraj, Joanna Saluk-Bijak
Nitric oxide (NO) is one of the most important signal molecules, involved in both physiological and pathological processes. As a neurotransmitter in the central nervous system, NO regulates cerebral blood flow, neurogenesis, and synaptic plasticity. The aim of our study was to investigate the effect of the extremely low-frequency electromagnetic field (ELF-EMF) on generation and metabolism of NO, as a neurotransmitter, in the rehabilitation of poststroke patients. Forty-eight patients were divided into two groups: ELF-EMF and non-ELF-EMF...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29138104/novel-mixed-vesicles-containing-lactobacilli-biosurfactant-for-vaginal-delivery-of-an-anti-candida-agent
#10
Angela Abruzzo, Barbara Giordani, Carola Parolin, Beatrice Vitali, Michele Protti, Laura Mercolini, Martina Cappelletti, Stefano Fedi, Federica Bigucci, Teresa Cerchiara, Barbara Luppi
The purpose of this work was to prepare and characterize an innovative formulation for vaginal delivery of econazole nitrate, commonly used for the treatment of Candida infections. A novel biosurfactant isolated from a vaginal Lactobacillus strain was used to prepare phosphatidylcholine based mixed vesicles. Biosurfactant was produced by Lactobacillus gasseri BC9, isolated from the vagina of a healthy premenopausal woman, and was chemically characterized by FT-IR and ESI-MS. Mixed vesicles, obtained through film rehydration and extrusion method, were characterized in terms of size, zeta potential, encapsulation efficiency, mucoadhesion properties and econazole release...
November 11, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29138017/angiotensin-converting-enzyme-inhibitors-enhance-the-hypotensive-effects-of-propofol-by-increasing-nitric-oxide-production
#11
Gustavo H Oliveira-Paula, Lucas C Pinheiro, Graziele C Ferreira, Waynice N P Garcia, Riccardo Lacchini, Luis V Garcia, Jose E Tanus-Santos
Propofol anesthesia is usually accompanied by hypotension. Studies have shown that the hypotensive effects of propofol increase in patients treated with angiotensin-converting enzyme inhibitors (ACEi). Given that both propofol and ACEi affect nitric oxide (NO) signaling, the present study tested the hypothesis that ACEi treatment induces pronounced hypotensive responses to propofol by increasing NO bioavailability. In this study we evaluated 65 patients, divided into three groups: hypertensive patients chronically treated with ACEi (HT-ACEi; n=21), hypertensive patients treated with other antihypertensive drugs instead of ACEi, such as angiotensin II receptor blockers, β-blockers or diuretics (HT; n=21) and healthy normotensive subjects (NT; n=23)...
November 11, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29137791/sonochemical-synthesis-and-characterization-of-new-seven-coordinated-zinc-cadmium-and-mercury-nitrate-complexes-new-precursors-for-nanostructure-metal-oxides
#12
S Mojahedi Jahromi, M Montazerozohori, A Masoudiasl, E Houshyar, S Joohari, J M White
The nitrate complexes of group 12 elements with a tridentate Schiff base ligand (L = (E)-N1-((E)-3- phenylallylidene)-N2-(2-((E)-((E)-3-phenylallylidene) amino)ethyl) ethane-1,2-diamine) were synthesized via sonochemical process and characterized by various physical and chemical methods. The structural analysis of the zinc nitrate complex by single crystal X-ray diffraction analysis shows that the central atom is seven-coordinated by three nitrogen atoms from the Schiff base ligand as well as four oxygen atoms from two different nitrate anions...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137789/sonochemical-synthesis-of-graphene-ce-tio2-and-graphene-fe-tio2-ternary-hybrid-photocatalyst-nanocomposite-and-its-application-in-degradation-of-crystal-violet-dye
#13
T P Shende, B A Bhanvase, A P Rathod, D V Pinjari, S H Sonawane
The present work deals with the preparation of graphene oxide (GO) using Hummers-Offeman method in the presence of ultrasonic irradiations. Further loading of TiO2 photocatalyst on prepared GO was accomplished which is basically oxidation reduction reaction between graphene oxide and titanium isopropoxide that leads to the formation of graphene-TiO2 nanocomposite. Graphene-Ce-TiO2 and Graphene-Fe-TiO2 nanocomposites were prepared using one step in-situ ultrasound assisted method using GO, titanium isopropoxide, cerium nitrate, ferric nitrate, and 2-propanol...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137707/use-of-chemical-conversion-for-determination-of-nitrated-aromatic-hydrocarbons-using-femtosecond-ionization-mass-spectrometry
#14
Takuya Fujii, Tomoko Imasaka, Totaro Imasaka
A sample containing nitrated aromatic hydrocarbons (NPAHs) was injected into the sample inlet port of a gas chromatograph (GC), along with hydrazine, a reducing reagent. The analytes that eluted from the GC column were measured by mass spectrometry (MS) using an ultraviolet femtosecond laser as the ionization source. When no reducing reagent was used, large numbers of polycyclic aromatic hydrocarbons (PAHs) including NPAHs were observed in the two-dimensional GC/MS display. In contrast, when hydrazine was present, reduced forms of NPAHs, which included amino PAHs, were detected...
December 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29136928/prediction-of-2-ehn-content-in-diesel-biodiesel-blends-using-ftir-and-chemometrics
#15
Dan Vrtiška, Pavel Šimáček
Quantification models based on the processing of FTIR spectra by partial least squares regression (PLS) were created in order to develop a method for the determination of 2-ethylhexyl nitrate (2-EHN) in diesel fuels. The set of standards was prepared using 2-EHN, biodiesel (FAME) and various mineral diesel fuels (2-EHN free). The standards were prepared in the concentration range of 2-EHN of 0-2436mgkg(-1). The set of the standards was divided into the calibration, validation and test sets. While the calibration set was used to build the model, validation set was used in order to optimize the model parameters...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136920/forensic-utility-of-a-nitrogen-and-oxygen-isotope-ratio-time-series-of-ammonium-nitrate-and-its-isolated-ions
#16
Brittany L Grimm, Libby A Stern, Alexander J Lowe
Ammonium nitrate (AN) based fertilizers are inexpensive and easily obtained, characteristics that often lead to their use in homemade explosive devices. The stable nitrogen and oxygen isotope ratios ((15)N/(14)N and (18)O/(16)O, expressed as δ(15)N and δ(18)O) of AN have the potential to aid in forensic investigations by providing supplemental properties for sample-to-sample comparison in materials which are otherwise chemically identical. The forensic utility of stable isotope analyses depends on demonstrated variation between different sources and minimal variation within a source...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29134675/analytical-approach-dissipation-pattern-and-risk-assessment-of-pesticide-residue-in-green-leafy-vegetables-a-comprehensive-review
#17
REVIEW
Waziha Farha, A M Abd El-Aty, Md Musfiqur Rahman, Ji Hoon Jeong, Ho-Chul Shin, Jing Wang, Sung Shik Shin, Jae-Han Shim
The category of "leafy vegetables" comprises a wide range of plants, including cabbage, lettuce, leeks, spinach, Swiss chard, and kale, and it forms a significant component of the human diet. Typically, leafy vegetables are low in calories and fat, are great sources of vitamins, protein, dietary fibre, minerals (including iron, calcium, and nitrates), and are rich in phytochemicals. To counter the impact of pests on vegetables, a broad variety of pesticides is used. Because of their large surface areas, leafy vegetables are expected to have high residual pesticide levels...
November 14, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29134523/effect-of-water-constituents-on-the-degradation-of-sulfaclozine-in-the-three-systems-uv-tio2-uv-k2s2o8-and-uv-tio2-k2s2o8
#18
Liliane Ismail, Corinne Ferronato, Ludovic Fine, Farouk Jaber, Jean-Marc Chovelon
Bicarbonate, phosphate, chloride ions, and humic substances are among the constituents most widely present in natural waters. These non-target constituents can greatly affect the efficiency of advanced oxidation processes used for water decontamination due to their capacity to interfere with the adsorption of the target compounds on the surface of TiO2, absorb photons, scavenge hydroxyl radicals (·OH), and generate photochemical reactive intermediates. In this work, the effect of these constituents on the degradation of sulfaclozine (SCL) was monitored in three different AOPs systems: UV/TiO2, UV/K2S2O8, and UV/TiO2/K2S2O8...
November 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29133913/nitric-oxide-mediated-inhibition-of-antigen-presentation-from-dcs-to-cd4-t-cells-in-cancer-and-measurement-of-stat1-nitration
#19
Joseph Markowitz, Jiang Wang, Zach Vangundy, Jia You, Vedat Yildiz, Lianbo Yu, Isaac P Foote, Owen E Branson, Andrew R Stiff, Taylor R Brooks, Brandon Biesiadecki, Thomas Olencki, Susheela Tridandapani, Michael A Freitas, Tracey Papenfuss, Mitch A Phelps, William E Carson
Myeloid derived suppressor cells (MDSC) produce nitric oxide (NO) and inhibit dendritic cell (DC) immune responses in cancer. DCs present cancer cell antigens to CD4(+) T cells through Jak-STAT signal transduction. In this study, NO donors (SNAP and DETA-NONOate) inhibited DC antigen presentation. As expected, MDSC isolated from peripheral blood mononuclear cells (PBMC) from cancer patients produced high NO levels. We hypothesized that NO producing MDSC in tumor-bearing hosts would inhibit DC antigen presentation...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29132974/topical-electrophilic-nitro-fatty-acids-potentiate-cutaneous-inflammation
#20
Alicia R Mathers, Cara D Carey, Meaghan E Killeen, Sonia R Salvatore, Laura K Ferris, Bruce A Freeman, Francisco J Schopfer, Louis D Falo
Endogenous electrophilic fatty acids mediate anti-inflammatory responses by modulating metabolic and inflammatory signal transduction and gene expression. Nitro-fatty acids and other electrophilic fatty acids may thus be useful for the prevention and treatment of immune-mediated diseases, including inflammatory skin disorders. In this regard, subcutaneous (SC) injections of nitro oleic acid (OA-NO2), an exemplary nitro-fatty acid, inhibit skin inflammation in a model of allergic contact dermatitis (ACD). Given the nitration of unsaturated fatty acids during metabolic and inflammatory processes and the growing use of fatty acids in topical formulations, we sought to further study the effect of nitro-fatty acids on cutaneous inflammation...
November 10, 2017: Free Radical Biology & Medicine
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