Results 41 to 50 of about 1,918,798 (195)

The depth specific significiance, relative abundance and phylogeography of anaerobic ammonium oxidation (anammox) in marine and estuarine sediments [PDF]

, 2009
PhDThe availability of fixed forms of nitrogen is critical to the regulation of primary production. Until recently, denitrification (the sequential reduction of NO3 -, through NO2 - , to di-nitrogen gas) was recognised as the only significant pathway
Rooks, Christine
core   +4 more sources

Synthesis of some biologically active 2,4’-bipyridine-5-carbonitriles carrying the 4-hydroxyphenylthio moiety [PDF]

Journal of the Serbian Chemical Society, 2009
A series of new 4-aryl-2’-[(4-hydroxyphenyl)thio]-6oxo-1,6-dihydro-2,4’-bipyridine-5-carbonitriles (3a–k) and 6-amino-4aryl-2’-[(4-hydroxyphenyl)thio]-2,4’-bipyridine-5-carbonitriles (4a–h) were synthesized from 4-hydroxythiophenol (1). The reaction of 4-
T. KARABASANAGOUDA, AIRODY VASUDEVA ADHIKARI, G. PARAMESHWARAPPA   +2 more
doaj   +3 more sources

quaternary ammonium compounds

, 2014
Citation: 'quaternary ammonium compounds' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.Q05003 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms ...
Lennart Kaj, Petra Wallberg, Eva Brorström-Lundén   +2 more
openaire   +3 more sources

Carboxylates and the uptake of ammonium by excised maize roots [PDF]

, 1975
The effect of carboxylates (organic acid anions) on NH 4 uptake was studied by changing the carboxylate level of roots prior to uptake experi ments. Succinate was the most effective stimulator of ammonium uptake.
Breteler, H.
core  

Critical Coalescence Concetration (CCC) as a parameter for evaluation of selected quaternary ammonium compounds [PDF]

, 2013
The objective of this paper was to determine the Critical Coalescence Concentration (CCC) of surfactants such as N(dodecyloxycarboxymethyl) N,N,N-(trimethylammonium) bromide (DMGM- 12), N-[2-(dodecyoxycarboxy)ethyl] N,N,N-(trimethylammonium) bromide ...
Szyszka, D., Danuta Szyszka
core   +1 more source

The Relation Between the Quantity of Ammonium Compounds in Tobacco and the Nitrogen Monoxide (NO) Levels in the Smoke of Cigarettes Marketed in the Netherlands

Contributions to Tobacco and Nicotine Research, 2006
It has been suggested that ammonium compounds in tobacco generate nitrogen monoxide (NO) in cigarette smoke. This causes the smoke to retain the broncho-dilatory properties of the tobacco, which leads to an increased uptake of nicotine and thus to a ...
van Amsterdam JGC, Brunt TM, Verlaan APJ, Cleven RFMJ, Opperhuizen A, Vleeming W   +5 more
doaj   +1 more source

Nitrogen regulation of protein–protein interactions and transcript levels of GlnK PII regulator and AmtB ammonium transporter homologs in Archaea [PDF]

, 2013
Gene homologs of GlnK PII regulators and AmtB-type ammonium transporters are often paired on prokaryotic genomes, suggesting these proteins share an ancient functional relationship.
Soppa, Jörg, Lange, Christian, Maupin-Furlow, Julie, Pedro-Roig, Laia, Pedro Roig, Laia, Bonete, María-José, Bonete, María José   +6 more
core   +1 more source

Leaves play a central role in the adaptation of nitrogen and sulfur metabolism to ammonium nutrition in oilseed rape (Brassica napus)

BMC Plant Biology, 2017
Background The coordination between nitrogen (N) and sulfur (S) assimilation is required to suitably provide plants with organic compounds essential for their development and growth.
Inmaculada Coleto, Marlon de la Peña, Jon Rodríguez-Escalante, Iraide Bejarano, Gaëtan Glauser, Pedro M. Aparicio-Tejo, M. Begoña González-Moro, Daniel Marino   +7 more
doaj   +1 more source

ammonium compounds

, 2014
Citation: 'ammonium compounds' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.A00290 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
openaire   +1 more source

Methods for determining cationic surface solids (critical review)

Український журнал військової медицини
The purpose of this articule to summarize and systematize information on methods for identification and quantification of quaternary ammonium compounds. Results.
O. V. Kovalska, M. Ye. Blazheyevskіy, E. O. Tsapko   +2 more
doaj   +1 more source