Results 91 to 100 of about 1,249,363 (328)
NITROGEN CYCLING IN A FOREST STREAM DETERMINED BY A 15N TRACER ADDITION [PDF]
, 2000 Nitrogen uptake and cycling was examined using a six‐week tracer addition of 15N‐labeled ammonium in early spring in Walker Branch, a first‐order deciduous forest stream in eastern Tennessee.
Meyer, Judy L. +6 more
core +1 more source
Magnetic Ordering of Ammonium Cations in NH$_4$I, NH$_4$Br and NH$_4$Cl [PDF]
J. Phys. Chem. C 123, 23655-23660 (2019)The different types of magnetism arise mainly from how electrons move and interact with each other. In this work, we show how protons (H$^+$) also exhibit magnetic behavior. We measured the magnetic susceptibility of the ammonium halides and identified pronounced increases at 232 K, 233 K and 243 K for NH$_4$I, NH$_4$Br and NH$_4$Cl, respectively ...
arxiv +1 more source
Soluble species in aerosol and snow and their relationship at Glacier 1, Tien Shan, China [PDF]
, 1998 Simultaneous sampling of aerosol (n = 20) and snow (n = 114) was made at Glacier 1, Tien Shan, between May 19 and June 29, 1996. Similar temporal patterns of some major ion (calcium, magnesium, potassium, sodium, chloride, and sulfate) concentrations ...
Dibb, Jack E. +6 more
core +3 more sources
Reorientational Dynamics and Solid-Phase Transformation of Ammonium Dicyanamide into Dicyandiamide [PDF]
, 2007 The reorientational dynamics of ammonium dicyanamide ND4[N(C≡N)2] and the kinetics as well as the mechanism of the solid-state isomerization reaction from ammonium dicyanamide into dicyandiamide (N≡C-N=C(NH2)2) was studied by means of 2H and 14N solid ...
Lotsch, Bettina V. +3 more
core +1 more source
Accurate rotational rest frequencies for ammonium ion isotopologues [PDF]
, 2018 We report rest frequencies for rotational transitions of the deuterated ammonium isotopologues NH3D+, NH2D2+ and NHD3+, measured in a cryogenic ion trap machine. For the symmetric tops NH3D+ and NHD3+ one and three transitions are detected, respectively, and five transitions are detected for the asymmetric top NH2D2+.
arxiv +1 more source
Infiltration and short-term movement of nitrogen in a silt-loam soil typical of rice cultivation in Arkansas [PDF]
, 2006 Rice production in Arkansas is one of the top three crop commodities in terms of cash receipts. Researchers and farmers report that nitrogen (N) needs to be managed according to a variety of factors with two important ones being soil and fertilizer type.
Brye, Kristofor R. +5 more
core +2 more sources
The Influence of Soap on Starch-Pigment Coated Paper [PDF]
, 1958 A literature survey is presented concerning the effects of soap on the rheological properties of coatings, and upon the physical properties of the coated paper.
Keck, Paul W.
core +1 more source
Calibration of the NDHA model to describe N2O dynamics from respirometric assays [PDF]
, 2017 The NDHA model comprehensively describes nitrous oxide (N2O) producing pathways by both autotrophic ammonium oxidizing and heterotrophic bacteria. The model was calibrated via a set of targeted extant respirometric assays using enriched nitrifying biomass from a lab-scale reactor.
arxiv +1 more source
Frontiers in Microbiology, 2015 The environmental drivers contributing to cyanobacterial dominance in aquatic systems have been extensively studied. However, understanding of toxic versus non-toxic cyanobacterial population dynamics and the mechanisms regulating cyanotoxin production ...
Lucas J Beversdorf +4 more
doaj +1 more source
The ammonolysis of esters in liquid ammonia [PDF]
, 2013 The rates of ammonolysis of alkyl benzoate and phenylacetate esters in liquid ammonia increase with the acidity of the leaving group alcohol and show relatively large Brønsted βlg values of −1.18 and −1.34, respectively, when plotted against the aqueous ...
Atherton, John +2 more
core +1 more source