Find your PDFs fast.
Welcome to the Pubget Medical Subject Headings (MESH) browser. Click on a topic or subtopic below to explore related papers. In the gold box is the most recent paper about the current MESH term, and below are 20 related papers.
Nitrogen Compounds (11):
Recent article
Nitrogen Compounds
Organic Letters (12)24 2010
Abstract
A highly enantioselective organocatalytic intermolecular conjugate addition of oximes to β-nitroacrylates has been developed. The highly functionalized adducts obtained are valuable precursors for asymmetric synthesis, as demonstrated by the synthesis of β(2,2)-amino acids and oxaz...
|
PMID: 21080696
PDF is available here.
PDF is available here.
| < More recent | Older article > |
Abstract
The effects of supplementation with nitrogenous compounds on intake, digestibility, and microbial protein synthesis in cattle fed low-quality tropical forage were assessed. Five rumen fistulated crossbred Holstein x Gir heifers were used, with initial average live weight of 180 +/- 21 kg. Signal gra...
|
PMID: 20414721
PDF is available here.
PDF is available here.
Abstract
Our data suggest that the environment has significantly changed since the 1980s. Anthropogenic activities in the watersheds may exert a substantial influence on carbon cycling processes in estuaries and potentially the coastal ocean.
Copyright 2010 Elsevier Ltd. All rights reserved....
|
PMID: 20427060
PDF is available here.
PDF is available here.
Journal of Hazardous Materials (178)1-3 2010
Abstract
In this work, a reliable simple method has been introduced for predicting enthalpy of melting of nitroaromatic energetic compounds through their molecular structures. This method can be used for a wide range of nitroaromatics including halogenated nitroaromatic compounds. The contribution of hydroge...
|
PMID: 20117881
PDF is available here.
PDF is available here.
Abstract
I were 1.84 and 1.17 for units capital I, Ukrainian and II, respectively. The Fs value of unit II was significantly lower than the safe design value (1.25). In addition, Fs decreased with increase in the normalized height of the leachate level, h/H, where h is the height of the leachate mound and H...
|
PMID: 20053545
PDF is available here.
PDF is available here.
Abstract
The effects of temperature on nitrification in a polishing biological aerated filter (BAF) were investigated using a 75-mm diameter pilot-scale BAF with a gravel media size of 5 mm and a depth of 1.7 m. Influent soluble chemical oxygen demand (sCOD) and ammonia-nitrogen (NH3-N) concentrations were a...
|
PMID: 20540428
PDF is available here.
PDF is available here.
Abstract
An atrazine degrading bacterium, strain KU001, was obtained from a sugarcane field at the Cane and Sugar Research and Development Center at the Kasetsart University, Kamphaeng Saen campus, Thailand. Strain KU001 had a rod-to-coccus morphological cycle during growth. Biolog carbon source analysis ind...
|
PMID: 20372034
PDF is available here.
PDF is available here.
Abstract
The potential energy surfaces of chiral tetraamine Pt(II) coordination complexes were computed at the B3LYP/LANL2DZ level of theory by a systematic variation of two dihedral angles: C12-C15-C34-C37 (theta) and C24-C17-C31-C48 (psi) employing a grid resolution of 30 degrees . Potential energy surface...
|
PMID: 20333441
PDF is available here.
PDF is available here.
Terapevticheskii arkhiv (82)2 2010
Abstract
The objective data on the time course of changes in the functional characteristics (G-17 and P-1) of the gastric mucosa (GM) in patients with DPU vary with the chemical composition of noxious substances and the length of service in chemical industry. The basic therapy for PDU contributes to a positi...
|
PMID: 20387669
PDF is available here.
PDF is available here.
Abstract
The composition of aroma compounds of dry champignons (Agaricus bisporus L.) were identified using capillary gas chromatography and chromatography-mass spectrometry. In total, 56 compounds were identified. It was found that the flavor of dry mushrooms was formed by the volatile compounds produced as...
|
PMID: 20198929
PDF is available here.
PDF is available here.
Abstract
Anaerobic lagoons are commonly used for the treatment of swine wastewater. Although these lagoons were once thought to be relatively simple, their physical, chemical, and biological processes are very complex. This study of anaerobic lagoons had two objectives: (i) to quantify denitrification enzyme...
|
PMID: 21043288
PDF is available here.
PDF is available here.
Water Science & Technology (62)10 2010
Abstract
A full-scale membrane bioreactor (1,600 m(3) d(-1)) was monitored for modelling purposes during the summer of 2006. A complete calibration of the ASM1 model is presented, in which the key points were the wastewater characterisation, the oxygen transfer and the biomass kinetics. Total BOD tests were...
|
PMID: 21076205
PDF is available here.
PDF is available here.
Abstract
We recommend an alteration to previously proposed methods in order to calculate the DPAO fraction through anaerobic-anoxic and anaerobic-aerobic batch tests. This information is expected to be valuable in studies focussed on optimising the amount of phosphorus removal achieved with simultaneous deni...
|
PMID: 20389004
PDF is available here.
PDF is available here.
Abstract
Landfill leachate can present extremely elevated concentrations of ammonium (up to 6,000 mg N-NH(4) (+) L(-1)) and a low biodegradable organic matter fraction. As an alternative to conventional systems, this wastewater can be treated on a more sustainable way by a fully autotrophic partial nitritati...
|
PMID: 20388991
PDF is available here.
PDF is available here.
Abstract
Bioaugmentation of bioreactors focuses on the removal of numerous organics, with little attention typically paid to the maintenance of high and stable nitrite accumulation in partial nitrification. In this study, a bioaugmented membrane bioreactor (MBR) inoculated with enriched ammonia-oxidizing bac...
|
PMID: 20075634
PDF is available here.
PDF is available here.
Abstract
The interactions between DNA purines (guanine and adenine) and the ruthenium complex Ru(NO)(NO(3))(3) were studied within nanostructured silica matrices prepared by a two-step sol-gel process. By infrared analysis in diffuse reflectance mode, it was proved that encapsulation induces a profound modif...
|
PMID: 19499946
PDF is available here.
PDF is available here.
Ecological Applications (19)6 2009
Abstract
We compared nitrogen (N) relations and phenology of A. gayanus and native grasses to examine the impact of invasion on N cycling and to determine possible reasons for invasiveness of A. gayanus. Andropogon gayanus produced up to 10 and four times more shoot phytomass and root biomass, with up to sev...
|
PMID: 19769102
PDF is available here.
PDF is available here.
Inorganic Chemistry (48)15 2009
Abstract
Dimeric (N(2)S)Ni complexes and the monomeric N(2)S(2) bismercaptodiazacycloheptane nickel complex, (bme-dach)Ni, serve as precursors to two N(2)-, N'-/ S- complexes where N(2) = diazacycloheptane, N' = imidazole and S = thiolate. As rare examples of nickel complexes containing a mixed thiolate/imid...
|
PMID: 19572492
PDF is available here.
PDF is available here.
Abstract
The availability and applicability of the combination of paramagnetic nitroxyl contrast agent and T(1)-weighted gradient echo (GE)-based dynamic magnetic resonance imaging (MRI) measurement for redox imaging are described. The time courses of T(1)-weighted GE MRI signal intensities according to firs...
|
PMID: 19336910
PDF is available here.
PDF is available here.
Abstract
The tetradentate tris(phosphino)silyl ligand [SiP(iPr)(3)] ([SiP(iPr)(3)] = [Si(o-C(6)H(4)P(i)Pr(2))(3)](-)) has been prepared, and its complexation with iron, cobalt, nickel, and iridium precursors has been explored. Several coordination complexes have been thoroughly characterized and are describe...
|
PMID: 19209938
PDF is available here.
PDF is available here.
Abstract
During January--March 2007, the Warren County Combined Health District (WCCHD) received 665 reports of respiratory and eye irritation from patrons and lifeguards at a hotel indoor waterpark resort in Ohio. Tests revealed normal water chemistry and air chlorine concentrations, and exposure to airborn...
|
PMID: 19194369
PDF is available here.
PDF is available here.
Microbial Ecology (57)1 2009
Abstract
To test if the quality and concentration of dissolved nitrogen (N) species could be a selective force in shaping bacterioplankton community structure, competition for various N compounds among five heterotrophic marine bacteria (Pseudomonas strains B, B25, and AX; Bacillus strain A6; Erythrobacter s...
|
PMID: 18545866
PDF is available here.
PDF is available here.
Abstract
The intensification of grassland systems is leading to serious environmental risks due to the large input of nitrogen (N) in fertilizers and the subsequent gaseous losses. Addition of nitrification inhibitors (NI) or urease activity inhibitors to fertilizers could reduce these losses to the atmosphe...
|
PMID: 19141792
PDF is available here.
PDF is available here.
Abstract
An environmental issue has arisen with M-72 malfunction on anti-tank ranges because many of these rockets break into pieces without exploding on impact, dispersing their energetic materials content on the ground surface and exposing them to transport by infiltration of rainfall and snowmelt. A case...
|
PMID: 19141797
PDF is available here.
PDF is available here.
Abstract
We investigated whether marsh surface elevation, plant community composition (annuals vs. perennials), and organic matter quantity/quality were associated with differences in denitrification rates in an urban tidal freshwater marsh of the Potomac River, United States. We measured denitrification rat...
|
PMID: 19202032
PDF is available here.
PDF is available here.
Abstract
WE constituents affected the 7.6- to 30.5-cm layer, and some leached deeper; for example, NH(4)(+)-N concentrations were 184 and 62 times higher in the shallow and deep layers, respectively. During winter stockpiling, WE-As concentrations beneath the stockpiles tripled and doubled in the 7.6- to 30....
|
PMID: 19329693
PDF is available here.
PDF is available here.
Abstract
The high N inputs to agricultural systems in many regions in 27 member states of the European Union (EU-27) result in N leaching to groundwater and surface water and emissions of ammonia (NH(3)), nitrous oxide (N(2)O), nitric oxide (NO), and dinitrogen (N(2)) to the atmosphere. Measures taken to dec...
|
PMID: 19202011
PDF is available here.
PDF is available here.
Abstract
An isotope dilution method using [1-(13)C]sodium (Na) acetate was conducted to determine the effect of feeding hop (Humulus lupulus L.) residues on plasma acetate metabolism in six adult crossbred sheep. The sheep were fed 63 g/kg BW(0.75)/d of either mixed hay (MH-diet) of orchardgrass (Dactylis gl...
|
PMID: 19365576
PDF is available here.
PDF is available here.
Abstract
We used thermodesorption gas chromatography/mass spectrometry (Td-GC/MS) to study organic compounds of low molecular mass and pyrolysis gas chromatography/mass spectrometry (Py-GC/MS) to characterize the chemical structure of macromolecules in TSP samples collected in different seasons from differen...
|
PMID: 20131595
PDF is available here.
PDF is available here.
Abstract
A constructed wetland treatment system (CWTS) has been adopted for removal of nitrogen from wastewater. The design methodologies developed for CWTS in previous studies were based on thumb rules, and first order/Monod type kinetics models. The use of kinetic models is system/environment specific. The...
|
PMID: 19633371
PDF is available here.
PDF is available here.
Water Science & Technology (60)10 2009
Abstract
Constructed wetlands, commonly known as ground filters, are well suited mostly for wastewater treatment in areas with no central sewage system. The basic difficulty with exploitation of constructed wetlands is connected with irregular hydraulic overload of its surface. However, irregular wastewater...
|
PMID: 19923767
PDF is available here.
PDF is available here.
Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment and General Theory (112)51 2008
Abstract
Combustion intermediates of two low-pressure premixed pyridine/oxygen flames with respective equivalence ratios of 0.56 (C/O/N = 1:4.83:0.20) and 2.10 (C/O/N = 1:1.29:0.20) have been identified with tunable synchrotron vacuum ultraviolet (VUV) photoionization and molecular-beam mass spectrometry tec...
|
PMID: 19053546
PDF is available here.
PDF is available here.
Abstract
The Amazon River estuary is notable at the Amazon Continental Shelf, where the presence of the large amount of water originating from the Amazon during the river's falling discharge period was made evident by the low salinity values and high nutrient levels. Even so, the presence of oceanic waters i...
|
PMID: 19039493
PDF is available here.
PDF is available here.
Abstract
A new series of asymmetric salicyl-, furanyl-, thienyl- and pyrrolyl-derived ONNO, NNNO, ONNS & NNNS donor antibacterial and antifungal Schiff-bases and their copper(II) and zinc(II) metal complexes have been synthesized and characterized. IR spectra indicated the ligands to act as quartdentate towa...
|
PMID: 19005942
PDF is available here.
PDF is available here.
Abstract
We investigated the reduction of a series of NACs with a model quinone (anthrahydroquinone-2,6-disulfonate monophenolate; AHQDS-) and a Fe(II)-catechol complex (1:2 Fe(II)-tiron complex; Fe(II)L2(6-)) over the pH range from 3 to 12 and variable reductant concentrations. Apparent kinetic isotope effe...
|
PMID: 19068817
PDF is available here.
PDF is available here.
Abstract
We investigated which factors control the reactivity of Fe(II) in smectites including total Fe content Fe(II)/total Fe ratio, and excess negative charge localization using 10 nitroaromatic compounds (NACs) as reactive probe molecules. Based on evidence from this work and previous spectroscopic studi...
|
PMID: 19068821
PDF is available here.
PDF is available here.
Abstract
The extracellular alpha-amylase production by Aspergillus oryzae was studied in submerged fermentation using an Adlof-Kuhner orbital shaker. The effect of initial pH values in the range of 4 to 7.5 on enzyme production was investigated and initial pH medium of 6.2 +/- 0.1 resulted in enhanced alpha-...
|
PMID: 19260332
PDF is available here.
PDF is available here.
Abstract
Chronic exposures are associated with airway acidity, whereas acute exposures are more closely associated with oxidative stress. These results suggest that the collection of EBC may contribute to predicting the pathological state of the airways of workers exposed to acute and chronic factors....
|
PMID: 18723434
PDF is available here.
PDF is available here.
Abstract
We propose a broader model of nitrogen transformations in treatment wetlands that integrates recent discoveries. This general model is intended as a conceptual tool for those working with nitrogen pollution abatement....
|
PMID: 19004390
PDF is available here.
PDF is available here.
Biochimica et Biophysica Acta (1784)11 2008
Abstract
We identified genes of particular pathways that could be organized in operons and are co-regulated. These results showed the great potential of proteomics to describe events in G. diazotrophicus cells by looking at proteins expressed under distinct growth conditions....
|
PMID: 18662807
PDF is available here.
PDF is available here.
Abstract
The relative stability of the nitrenium ions derived from a set of 43 aromatic and heteroaromatic amines of diverse structure was evaluated by density functional theory (DFT) calculations in order to examine the role of these electrophilic intermediates on mutagenic activity. Correlations were sough...
|
PMID: 18799337
PDF is available here.
PDF is available here.
Organic Letters (10)20 2008
Abstract
A two-step procedure involving the enantioselective addition of alpha-nitro esters to imines, followed by reductive denitration, provides a convenient new enantioselective synthesis of beta-amino acids. Specifically, beta-phenyl alanine derivatives with up to 98% ee are formed in goo...
|
PMID: 18798639
PDF is available here.
PDF is available here.
Abstract
Nickel(II) and copper(II) complexes are synthesized with a novel tetradentate macrocyclic ligand, i.e. 2,6,12,16,21,22-hexaaza;3,5,13,15-tetraphenyltricyclo[15,3,1,1(7-11)] docosa;1(21),2,5,7,9,11(22),12,15,17,19-decaene (L) and characterized by the elemental analysis, magnetic susceptibility measur...
|
PMID: 18023609
PDF is available here.
PDF is available here.
Abstract
We examine the attractive interactions that occur within a given plane, and between adjacent planes. Calculations of Hartree Fock and Møller Plesset perturbation theory carried to a second-order expansion are used. Both quantum mechanical approximations are implemented with 6-31G* basis functions....
|
PMID: 18780785
PDF is available here.
PDF is available here.
Abstract
Uncertainty still exists regarding the role(s) of natural organic matter in the reduction of chemicals in anoxic environments. This work studied the effect of Suwannee river humic acid (SRHA) on the reduction of nitrobenzenes in goethite suspensions by Fe(II) species. The pseudo-first-order rate con...
|
PMID: 18800527
PDF is available here.
PDF is available here.
Water Research (42)15 2008
Abstract
The hydrogen-based membrane biofilm reactor (MBfR) has been well studied and applied for denitrification of nitrate-containing water and wastewater. Adding an oxygen-based MBfR allows total-nitrogen removal when the input nitrogen is ammonium. However, most wastewaters also contain a significant con...
|
PMID: 18684483
PDF is available here.
PDF is available here.
Abstract
A detailed investigation of the basic fraction of a CO2 extract of ambrette seeds (Abelmoschus moschatus) revealed a total of 58 nitrogen-containing compounds. The identification of these compounds was carried out by GC-MS and NMR. All the identified nitrogen-containing compounds are reported here f...
|
PMID: 18656937
PDF is available here.
PDF is available here.
Physical Review Letters (101)8 2008
Abstract
We report observations of self-sustaining spatiotemporal chemical oscillations during metal-organic chemical vapor deposition of InN onto GaN. Under constant supply of vapor precursors trimethylindium and NH3, the condensed-phase cycles between crystalline islands of InN and elemental In droplets. P...
|
PMID: 18764640
PDF is available here.
PDF is available here.
Abstract
Periodic mesoporous organosilicas incorporating diethylbenzene bridges in their pore walls were applied for the adsorption of nitroenegetic targets from aqueous solution. The materials were synthesized by co-condensing 1,4-bis(trimethoxysilylethyl)benzene (DEB) with 1,2-bis(trimethoxysilyl)ethane to...
|
PMID: 18590292
PDF is available here.
PDF is available here.
Abstract
A novel CESH-producing strain was isolated for biotransforming cis-epoxysuccinate to D(-)-tartaric acid. It was assigned to genus Bordetella and named Bordetella sp. BK-52. The optimal conditions were found to be 30 degrees C, pH 7.0, fermentation time 36 h, carbon source of saccharose, inorganic ni...
|
PMID: 18956758
PDF is available here.
PDF is available here.
Abstract
Copper(I) imidate and amidate complexes of chelating N,N-donor ligands, which are proposed intermediates in copper-catalyzed amidations of aryl halides, have been synthesized and characterized by X-ray diffraction and detailed solution-phase methods. In some cases, the complexes adopt neutral, three...
|
PMID: 18597458
PDF is available here.
PDF is available here.
Journal of Organic Chemistry (73)15 2008
Abstract
We examined its gas phase acidity and proton affinity using quantum mechanical calculations and mass spectrometric experimental methods. We measure two acidities for epsilonA: a more acidic site (DeltaH(acid) = 332 kcal mol(-1); DeltaG(acid) = 325 kcal mol(-1)) and a less acidic site (DeltaH(acid) =...
|
PMID: 18593189
PDF is available here.
PDF is available here.
Analytica Chimica Acta (621)2 2008
Abstract
A multivariate model to characterise nitroaromatics and related compounds based on molecular descriptors was calculated. Descriptors were collected from literature and through empirical, semi-empirical and density functional theory-based calculations. Principal components were used to describe the d...
|
PMID: 18573379
PDF is available here.
PDF is available here.
Water Research (42)14 2008
Abstract
Dissolved organic nitrogen (DON), which may act as a nutrient and a disinfection by-product precursor, accounts for most of the dissolved nitrogen in nitrified-denitrified wastewater effluents. To gain insight into the behavior of wastewater-derived DON in engineered and natural systems, samples fro...
|
PMID: 18672263
PDF is available here.
PDF is available here.
Water Research (42)14 2008
Abstract
Triggers of severe nitrification in distribution systems are still not clearly understood. Recently, the biostability concept was proposed to explain the chloramine residual below which signs of nitrification would be seen. To improve understanding, mildly nitrifying bulk water samples (nitrite less...
|
PMID: 18649914
PDF is available here.
PDF is available here.
Abstract
Approximately 80 different crop species are grown in the United States in widely differing geographic areas, climatic and edaphic conditions, and management practices. Although the majority of cultivated acreage in the United States is planted with only about 10 primary crops, uncertainties associat...
|
PMID: 18720648
PDF is available here.
PDF is available here.
Environmental Pollution (154)3 2008
Abstract
Abstract
Synthesis and in vitro anti-Helicobacter pylori activity of N-[5-(5-nitro-2-heteroaryl)-1,3,4-thiadiazol-2-yl]thiomorpholines 5-7(a-c) and some related compounds 8a-c and 9a-c were described. The anti-H. pylori activity of target compounds along with commercially available antibiotics such as metron...
|
PMID: 18192086
PDF is available here.
PDF is available here.
Abstract
Novel 1-aryl-3-(5-nitro-2-thienyl)-4-aroyl-pyrazoles 7 have been synthesized by the 1,3-dipolar cycloaddition of 3-arylsydnones 3 with 1-aryl-3-(5-nitro-2-thienyl)-2-propyn-1-ones 6. The newly synthesized compounds were well characterized by elemental analysis, IR, (1)H NMR and mass spectral studies...
|
PMID: 17923171
PDF is available here.
PDF is available here.
Abstract
We investigated the effects of addition of ethanol and NaCl solution (hereafter 'salt'), and of freezing and drying, on carbon and nitrogen isotopic values in blood of the spectacled petrel Procellaria conspicillata, and compared these with those from simultaneously growing feathers. The mean delta(...
|
PMID: 18642324
PDF is available here.
PDF is available here.