25,007 results match your criteria nitrous


Photoinduced linkage isomers in a model ruthenium nitrosyl complex: Identification and assignment of vibrational modes.

Spectrochim Acta A Mol Biomol Spectrosc 2021 Jul 22;263:120217. Epub 2021 Jul 22.

Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3 Acad. Lavrentiev Avenue, Novosibirsk 630090, Russian Federation.

Photoinduced NO-linkage isomers were investigated in the solid state of labelled trans-[Ru(NO)(py)F](ClO) complex by combined IR-spectroscopy and DFT calculations. Based on the experimental data and the DFT calculations of this isotopically labelled NO nitrosyl compound, we present a complete assignment of the vibrational bands of three nitrosyl linkage isomers in a range from 4000 to 200 cm. The calculated IR-spectra match well with the experimental data allowing reliable assignment of the vibrational bands. Read More

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Ontario Dentists' Practice of Sedation and General Anesthesia: Barriers to Access and Use.

J Can Dent Assoc 2021 Feb;87:l2

Background: To investigate, among Ontario dentists, (1) self-reported barriers to access to sedation and general anesthesia (GA) services and (2) their current use of sedation and GA.

Methods: Of Ontario dentists practising, 3001 were randomly selected to complete a 16-question survey by mail or online in 2011. Mixed analysis of variance (ANOVA) followed by independent-sample t tests or 1-way ANOVA evaluated the relation between dentists' views and demographic variables including sex, clinical experience and size of primary practice. Read More

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February 2021

Direct NO Reduction by a Biomimetic Iron(II) Pyrazolate MOF.

Angew Chem Int Ed Engl 2021 Aug 2. Epub 2021 Aug 2.

Ohio State University, Chemistry and Biochemistry, 100 W 18th Ave, 43210, Columbus, UNITED STATES.

A novel metal-organic framework (MOF) containing one-dimensional, Fe2+ chains bridged by dipyrazolate linkers and N,N -dimethylformamide (DMF) ligands has been synthesized. The unusual chain-type metal nodes feature accessible coordination sites on adjacent metal centers, resulting in motifs that are reminiscent of the active sites in non-heme diiron enzymes. The MOF facilitates direct reduction of nitric oxide (NO), producing nearly quantitative yields of nitrous oxide (N2O) and emulating the reactivity of flavodiiron nitric oxide reductases (FNORs). Read More

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Does biochar accelerate the mitigation of greenhouse gaseous emissions from agricultural soil? - A global meta-analysis.

Environ Res 2021 Jul 29:111789. Epub 2021 Jul 29.

Department of Soil Science, Faculty of Agriculture, Bahauddin Zakariya University, Multan, Punjab, Pakistan.

Greenhouse gaseous (GHGs) emissions from cropland soils are one of the major contributors to global warming; however, the extent and pattern of these climatic breakdowns are typically determined by the management practices in-place. The use of biochar on cropland soils holds a great promise for increasing the overall crop productivity. However, biochar applications to agricultural soil has grown in popularity as a strategy to off-set the negative feedback associated with agriculture GHGs emissions i. Read More

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Research progress and prospects for using biochar to mitigate greenhouse gas emissions during composting: A review.

Sci Total Environ 2021 Jul 26;798:149294. Epub 2021 Jul 26.

Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, PR China; International S&T Cooperation Center for Urban Alternative Water Resources Development, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, PR China. Electronic address:

Biochar possesses a unique porous structure and abundant surface functional groups, which can potentially help mitigate greenhouse gas (GHG) emissions from compost. This review summarizes the properties and functions of biochar, and the effects of biochar on common GHGs (methane (CH), carbon dioxide (CO), and nitrous oxide (NO)) and ammonia (NH, an indirect GHG) during composting. Studies have shown that it is possible to improve the mitigation of GHG emissions during composting by adjusting the biochar amount, type of raw material, pyrolysis temperature, and particle size. Read More

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Inhibition of free nitrous acid and free ammonia on polyphosphate accumulating organisms: Evidence of insufficient phosphorus removal through nitritation-denitritation.

J Environ Manage 2021 Jul 27;297:113390. Epub 2021 Jul 27.

Sanitary Engineering Laboratory, Department of Water Resources and Environmental Engineering, School of Civil Engineering, National Technical University of Athens, 5 Iroon Polytechniou, Zografou, 15780, Athens, Greece.

The purpose of this study is to investigate the effect of Free Nitrous Acid (FNA) and Free Ammonia (FA) on enhanced biological phosphorus removal (EBPR) and in particular on the aerobic phosphorus uptake rate (PUR). To this end, a PAO-enriched biomass was developed at a lab-scale reactor in order to fuel a series of ex-situ batch experiments to test the effect of various nitrite or ammonium concentrations on the phosphorus uptake rate at different pH values. FNA was found to be a strong inhibitor of EBPR, in agreement with other studies with PUR being inhibited by 50 % under 1. Read More

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Pollution control in biochar-driven clean composting: Emphasize on heavy metal passivation and gaseous emissions mitigation.

J Hazard Mater 2021 Jul 15;420:126635. Epub 2021 Jul 15.

College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China; Swedish Centre for Resource Recovery, University of Borås, 50190 Borås, Sweden. Electronic address:

Present study was focus on the pollution control aspect of gaseous mitigation and heavy metal passivation as well as their associated bacterial communities driven by apple tree branch biochar (BB) during sheep manure composting. Six treatment was performed with distinct concentration of BB from 0%, 2.5%, 5%, 7. Read More

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Pollution in the interflow from a simple landfill in a mountainous and hilly area in Southwest China.

Sci Total Environ 2021 Jun 24;793:148656. Epub 2021 Jun 24.

Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.

Simple landfills lack pollution prevention measures and therefore continuously release pollutants into the surrounding environment. There are a large number of simple landfills in the mountainous and hilly areas in China, and the interflow accounts for a large proportion of runoff. However, the pollution in the interflow stemming from the simple landfill has not been extensively studied. Read More

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Simulating soil nitrogen fate in irrigated crop production with manure applications.

Sci Total Environ 2021 Jun 17;793:148510. Epub 2021 Jun 17.

USDA-ARS Rangeland Resources and Systems Research Unit, Fort Collins, CO 80526, United States of America.

Dairy manure is commonly applied to irrigated agricultural crops in the Magic Valley Region of southern Idaho, which has reported to impact the quality of surface and ground water. In this study, we used the Root Zone Water Quality Model (RZWQM2) to provide information about the long-term implications of manure applications. RZWQM2 was first calibrated and validated using 4 years of data from a long-term study with annual and biennial manure application rates of 18 Mg ha, 36 Mg ha, and 52 Mg ha, along with a control and conventional fertilizer treatment for crop yield, soil water and soil N. Read More

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Greenhouse gas budgets of severely polluted urban lakes in India.

Sci Total Environ 2021 Jul 12;798:149019. Epub 2021 Jul 12.

UK Centre for Ecology & Hydrology, Edinburgh, UK.

Inland waters are important sources of greenhouse gases and emissions from polluted subtropical systems may be contributing to the observed global increase in atmospheric methane concentrations. Here we detail a scoping study where dissolved concentrations of greenhouse gases methane (CH), carbon dioxide (CO) and nitrous oxide (NO) were measured in two contrasting urban lakes in Bangalore (Bengaluru), Karnataka, India, from June 2018 to February 2020. Bellandur Lake is a severely polluted system whilst Jakkur Lake has been subject to partial restoration via treatment of organic matter inputs. Read More

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Decomposition of nitrous oxide in hydrated cobalt(I) clusters: a theoretical insight into the mechanistic roles of ligand-binding modes.

Phys Chem Chem Phys 2021 Jul 29. Epub 2021 Jul 29.

Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong SAR, P. R. China.

Hydrated cobalt(i) cluster ions, [Co(H2O)n]+, can decompose the inert nitrous oxide molecule, N2O. Density functional theory suggests that N2O can anchor to Co+ of [Co(N2O)(H2O)n]+ through either O end-on (η1-OL) or N end-on (η1-NL) coordinate mode. The latter is thermodynamically more favorable resulting from a subtle π backdonation from Co+ to N2O. Read More

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Heterogeneous Formation of HONO Catalyzed by CO.

Environ Sci Technol 2021 Jul 29. Epub 2021 Jul 29.

Center for Energy and Environmental Resources, University of Texas at Austin, Austin, Texas 78712, United States.

Gas-phase nitrous acid (HONO) is a major precursor of hydroxyl radicals that dominate atmospheric oxidizing capacity. Nevertheless, pathways of HONO formation remain to be explored. This study unveiled an important CO-catalysis mechanism of HONO formation, using Born-Oppenheimer molecular dynamics simulations and free-energy samplings. Read More

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The impact of coal combustion, nitrous oxide emissions, and traffic emissions on COVID-19 cases: a Markov-switching approach.

Environ Sci Pollut Res Int 2021 Jul 28. Epub 2021 Jul 28.

Department of Management, College of Business Administration, King Saud University, P.O. Box 71115, Riyadh, 11587, Saudi Arabia.

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spread to more than 200 countries with a current case fatality ratio (CFR) of more than 2% globally. The concentration of air pollutants is considered a critical factor responsible for transmitting coronavirus disease among the masses. The photochemical process and coal combustions create respiratory disorders that lead to coronavirus disease. Read More

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Safety and Utility of a Novel Nitrous Oxide Delivery System in Cosmetic Surgery: A National Survey of Physician Practices.

Dermatol Surg 2021 Jul 20. Epub 2021 Jul 20.

Laser and Skin Surgery Center of New York, New York, New York Dermatology, Laser and Vein Specialists of the Carolinas, Charlotte, North Carolina Sanctuary Plastic Surgery, Boca Raton, Florida.

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Model assisted identification of NO mitigation strategies for full-scale reject water treatment plants.

Water Sci Technol 2021 Jul;84(2):349-363

Institute for Sanitary Engineering and Waste Management, Leibniz University Hanover (ISAH), Welfengarten 1, 30163 Hannover, Germany.

In a 3-year research project, a new approach to forecast biological NO formation and emission at high-strength reject water treatment has been developed (ASM3/1_N2O). It was calibrated by extensive batch-tests and finally evaluated by long-term measurement campaigns realized at three wastewater treatment plants (WWTPs) with different process configurations for nitrogen removal of reject water. To enable a model application with common full-scale data, the nitritation-connected supplementary processes that are responsible for NO formation are not depicted in the model. Read More

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A predictive model for NO production in anammox-granular sludge reactors: Combined effects of nitrite/ammonium ratio and organic matter concentration.

J Environ Manage 2021 Jul 26;297:113295. Epub 2021 Jul 26.

Laboratory of Biological Processes, Department of Hydraulics and Sanitation, São Carlos School of Engineering, University of São Paulo, Av. João Dagnone, 1100, Jd. Santa Angelina, 13563-120, São Carlos, SP, Brazil.

Once the use of anammox reactors has been increasing on a global scale, it is important to understand the mechanisms of NO emissions and how to minimise the emissions by optimising the operating conditions. In this study, the influence of chemical oxygen demand (COD) (from 0 mgO L to 100 mgO L) and nitrite/ammonium ratio from 0.79 to 2. Read More

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Liming improves the stability of soil microbial community structures against the application of digestate made from dairy wastes.

J Environ Manage 2021 Jul 26;297:113356. Epub 2021 Jul 26.

Global Center for Food, Land and Water Resources, Research Faculty of Agriculture, Hokkaido University, Japan. Electronic address:

Lime is used to reduce soil acidification in agricultural soils. However, its effects on the soil microbial community are not well understood. Additionally, the soil microbial community is known to be influenced by fertilizers. Read More

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[Effects of Biochar Addition Under Different Water Management Conditions on NO Emission From Paddy Soils in Northern Hainan].

Huan Jing Ke Xue 2021 Aug;42(8):3943-3952

College of Tropical Crops, Hainan University, Haikou 570228, China.

Alternating dry and wet conditions affect the main processes of NO production, such as nitrification and denitrification. Such conditions are very common in tropical rice-growing areas, such as Hainan. As a type of soil amendment, biochar is widely used to improve physical and chemical properties of soil and to reduce soil greenhouse gas emissions. Read More

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[Effects of Coconut Chaff Biochar Amendment on Methane and Nitrous Oxide Emissions from Paddy Fields in Hot Areas].

Huan Jing Ke Xue 2021 Aug;42(8):3931-3942

College of Tropical Crops, Hainan University, Haikou 570228, China.

Based on the rice-vegetable crop rotation model, in-situ measurements of nitrous oxide (NO) and methane (CH) emissions were conducted in double-cropping rice fields in Hainan to determine the impact of coconut chaff biochar on greenhouse gas emissions. The experiment involved four treatments:conventional farming fertilization (CON), nitrogen fertilizer combined with 20 t ·hm biochar (B1), nitrogen fertilizer combined with 40 t ·hm biochar (B2), and no nitrogen fertilizer, as the control (CK). The NO and CH emissions were measured using static chamber-gas chromatography during the two paddy seasons, and the global warming potential (GWP) and greenhouse gas intensity (GHGI) were also estimated. Read More

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[Effect of Elevated CO on NO Emissions from Different Rice Cultivars in Rice Fields].

Huan Jing Ke Xue 2021 Aug;42(8):3924-3930

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.

Using the free air CO enrichment (FACE) platform, an in-situ field experiment was conducted to explore the impacts of elevated CO mole fraction ([CO]) on NO emissions from strongly and weakly responsive rice cultivars. Under elevated [CO], grain yield of the strongly responsive rice cultivars increased significantly, by more than 30%, whereas the weakly responsive cultivars showed a growth rate of 10%-15%. The four treatments comprised A-W (normal [CO]+weakly responsive cultivar), F-W (elevated [CO]+weakly responsive cultivar), A-S (normal [CO]+strongly responsive cultivar), and F-S (elevated [CO]+strongly responsive cultivar). Read More

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Production of -NaNO and NaNO by Ball Milling NaO and NO in Alkali Metal Halide Salts.

ACS Omega 2021 Jul 8;6(28):18248-18252. Epub 2021 Jul 8.

Department of Chemistry, University of Miami, Coral Gables, Florida 33124, United States.

Ball milling of sodium oxides and alkali metal halide salts under a pressure of 2 atm nitrous oxide at temperatures of 38 ± 4 °C is reported. After 2.5 h of ball milling, FTIR data for both NO and NO additions show conclusively that -NaNO is formed based on excellent agreement with data reported earlier by Jansen and Feldmann who prepared pure crystalline -NaNO by reaction of sodium oxide and nitrous oxide for 2 h at 360 °C in a tube furnace. Read More

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Temporal triggers of NO emissions during cyclical and seasonal variations of a full-scale sequencing batch reactor treating municipal wastewater.

Sci Total Environ 2021 Jul 18;797:149093. Epub 2021 Jul 18.

Department of Civil and Environmental Engineering, Hanyang University, Seongdong-gu, Seoul 04763, Republic of Korea. Electronic address:

To investigate the major triggers of nitrous oxide (NO) production in a full-scale wastewater treatment plant, NO emissions and wastewater characteristics (ammonia, nitrite, nitrate, total nitrogen, dissolved inorganic carbon, dissolved organic carbon, pH, temperature, dissolved oxygen and specific oxygen uptake rate), the results of variations in the cycling of a sequential batch reactor (SBR, where only full nitrification was performed), were monitored seasonally for 16 months. Major triggers of NO production were investigated based on a seasonal measured database using a random forest (RF) model and sensitivity analysis, which was applied to identify important input variables. As the result of seasonal monitoring in the full-scale SBR, the NO emission factor relative to daily total nitrogen removal ranged from 0. Read More

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Nitrous oxide fluxes from long-term limed soils following P and glucose addition: Nonlinear response to liming rates and interaction from added P.

Sci Total Environ 2021 Jul 16;797:148933. Epub 2021 Jul 16.

Department of Agroecology, Aarhus University, Blichers Allé 20, 8830 Tjele, Denmark; iCLIMATE, Aarhus University Interdisciplinary Centre for Climate Change, Blichers Allé 20, 8830 Tjele, Denmark.

Liming of acidic soils to regulate pH for crop growth may decrease emissions of nitrous oxide (NO) due to direct effects of pH on the synthesis of NO reductases by denitrifying bacteria. However, liming also changes general pH-dependent soil properties, including availability of phosphorus (P), with a feedback on NO fluxes that remains largely unknown. Here we used a mesocosm approach to study the combined role of liming and P in regulating NO fluxes from denitrification in an arable coarse sandy soil where NO emissions under field condition coincided with rainfall events and irrigation, which facilitated anoxia. Read More

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Solid-gas reactions for nitroxyl (HNO) generation in the gas phase.

J Inorg Biochem 2021 Jul 9;223:111535. Epub 2021 Jul 9.

Departamento de Química Inorgánica, Analítica, y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, INQUIMAE-CONICET, Ciudad Universitaria, Pab. 2, C1428EHA Buenos Aires, Argentina. Electronic address:

We present a novel nitroxyl (HNO) generation method, which avoids the need of using a liquid system or extreme experimental conditions. This method consists of the reaction between a gaseous base and an HNO donor (Piloty's acid) in the solid phase, allowing the formation of gaseous HNO in a fast and economical way. Detection of HNO was carried out indirectly, measuring the nitrous oxide (NO) byproduct of HNO dimerization using infrared spectroscopy, and directly, using mass spectrometry techniques and an electrochemical HNO sensor. Read More

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Structural characterization and mechanisms of macrophage immunomodulatory activity of a pectic polysaccharide from Cucurbita moschata Duch.

Carbohydr Polym 2021 Oct 2;269:118288. Epub 2021 Jun 2.

College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; National Engineering Research Center for Fruits and Vegetables Processing, Beijing 100083, China. Electronic address:

A pectic polysaccharide (named CMDP-4b) with a molecular weight of 31.97 kDa was extracted from Cucurbita moschata Duch and purified by column chromatography. On the basis of methylation, Fourier-transform infrared, monosaccharide composition, and one- and two-dimensional nuclear magnetic resonance spectroscopy analyses, the structure of CMDP-4b was determined to be composed of an α-1,4-linked homogalacturonan backbone, which was slightly acetylated and highly methyl-esterified, and branched at the O-3 position of the →4)-α-D-GalpA-6-OMe-(1→. Read More

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October 2021

Long-Term Fertilization Alters Nitrous Oxide Cycling Dynamics in Salt Marsh Sediments.

Environ Sci Technol 2021 Aug 22;55(15):10832-10842. Epub 2021 Jul 22.

Department of Geosciences, Princeton University, Princeton 08544, New Jersey, United States.

Salt marsh sediments are known hotspots for nitrogen cycling, including the production and consumption of nitrous oxide (NO), a potent greenhouse gas and ozone-depleting agent. Coastal eutrophication, particularly elevated nitrogen loading from the application of fertilizers, is accelerating nitrogen cycling processes in salt marsh sediments. Here, we examine the impact of long-term fertilization on nitrogen cycling processes with a focus on NO dynamics in a New England salt marsh. Read More

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Important reminder: nitrous oxide (NO) as a cause of functional vitamin B deficiency.

BMJ Case Rep 2021 Jul 21;14(7). Epub 2021 Jul 21.

Internal Medicine, Hurley Medical Center, Flint, Michigan, USA

A 32-year-old woman who misused multiple substances, including nitrous oxide (NO), sought medical advice after she subacutely developed bilateral lower extremity weakness without a sensory level but with ataxia-her significant other developed similar symptoms with vitamin B deficiency due to NO intake. Laboratory results revealed macrocytic anaemia despite normal B and folate levels, with serum markers pointing towards functional cobalamin deficiency. Spinal MRIs and cerebrospinal fluid analysis were unremarkable. Read More

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Drug-Induced Peripheral Neuropathy: Diagnosis and Management.

Curr Cancer Drug Targets 2021 Jul 20. Epub 2021 Jul 20.

Department of Internal Medicine Naef K. Basile Cancer Institute American University of Beirut Medical Center Riad El Solh 1107 2020 Beirut, Lebanon.

Peripheral neuropathy comes in all shapes and forms and is a disorder which is found in the peripheral nervous system. It can have an acute or chronic onset depending on the multitude of pathophysiologic mechanisms involving different parts of nerve fibers. A systematic approach is highly beneficial when it comes to cost-effective diagnosis. Read More

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Persistence and spread of tetracycline resistance genes and microbial community variations in the soil of animal corrals in a semi-arid planted forest.

FEMS Microbiol Ecol 2021 07;97(8)

Department of Natural Resources, Gilat Research Center, Agriculture Research Organization, Mobile, Post Negev 8531100, Israel.

At the spring, goat and sheep herds are transferred to planted forests, in a semi-arid region in the northern Negev Desert, Israel, to reduce herbaceous biomass and, fire risk. The herds are held overnight in corrals for about 4 months, enriching the soil with organic matter and nitrogen. This research examined the effect of these enrichments on soil bacterial community structure (BCS) and the abundance of tetracycline resistance genes (TRGs) in active and abandoned corrals (1-10-years-old). Read More

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