Results 31 to 40 of about 449,412 (331)

Computer quantum-chemical modeling of the interaction of selenium nanoparticles with quaternary ammonium compounds

open access: yesФизико-химические аспекты изучения кластеров, наноструктур и наноматериалов, 2023
In this paper, a computer quantum-chemical simulation of the interaction of selenium nanoparticles with quaternary ammonium compounds was carried out, in which models of molecular complexes, electron density distribution, as well as higher populated and ...
A.V. Blinov   +6 more
doaj   +1 more source

Selective Recognition of Ammonium over Potassium Ion with Acyclic Receptor Molecules Bearing 3,4,5-Trialkylpyrazolyl Groups

open access: yesOrganic Materials, 2022
Among the 1,3,5-trisubstituted 2,4,6-triethylbenzenes bearing pyrazolyl groups, the compounds with 3,5-dimethylpyrazolyl moieties were found to be effective receptors for ammonium ions (NH4 +).
Felix Fuhrmann   +2 more
doaj   +1 more source

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

open access: yesJournal 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   +2 more
doaj   +3 more sources

The crystal and molecular structure of ammonium titanyl oxalate [PDF]

open access: yes, 1974
Ammonium titanyl oxalate monohydrate, (NH4)2 TiO(C2O4)2·H2O, is monoclinic with cell parameters A = 13.473(2), B = 11.329(1), C = 17.646(2) Å, β = 126.66(1)°. The space group is P21/c with Z = 8, dc = 1.808 g cm−3 and dm = 1.80 g cm−3.
Gellings, P.J.   +2 more
core   +3 more sources

Cloud condensation nuclei activity, closure, and droplet growth kinetics of Houston aerosol during the Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS) [PDF]

open access: yes, 2009
In situ cloud condensation nuclei (CCN) measurements were obtained in the boundary layer over Houston, Texas, during the 2006 Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS) campaign onboard the CIRPAS Twin Otter.
Dubey, Manvendra K.   +12 more
core   +2 more sources

Effect of operational parameters and Pd/In catalyst in the reduction of nitrate using copper electrode [PDF]

open access: yes, 2017
Water with high concentration of nitrate may cause damage to health and to the environment. This study investigated how concentration, current density, flow, pH, the use of Pd/In catalyst and operating mode (constant current density and constant cell ...
Beltrame, Thiago Favarini   +5 more
core   +1 more source

N-(((1S,5R)-6,6-Dimethylbicyclo[3.1.1]hept-2-en-2-yl)methyl)-3-((1R,5S)-6,6-dimethylbicyclo[3.1.1]hept-2-ene/ane-2-carboxamido)-N,N-dimethylpropan-1-aminium Bromide

open access: yesMolbank, 2023
The synthesis of the title compounds was performed from (-)-cis-myrtanic and (-)-myrtenic acids. The compounds obtained were characterized using 1H- and 13C-NMR, IR, and high-resolution mass spectrometry.
Ilmir R. Gilfanov   +10 more
doaj   +1 more source

Pentazole and Ammonium Pentazolate: Crystalline Hydro-Nitrogens at High Pressure

open access: yes, 2017
Two new crystalline compounds, pentazole (N_{5}H) and ammonium pentazolate (NH_{4})(N_{5}), both featuring cyclo-{\rm N_{5}^{-}} are discovered using first principles evolutionary search of the nitrogen-rich portion of the hydro-nitrogen binary phase ...
Oleynik, Ivan I., Steele, Brad A.
core   +4 more sources

Nitrogen removal in marine environments: recent findings and future research challenges [PDF]

open access: yes, 2005
Respiratory reduction of nitrate (denitrification) is recognized as the most important process converting biologically available (fixed) nitrogen to N2. In current N cycle models, a major proportion of global marine denitrification (50–70%) is assumed to
Aller, Robert Curwood   +7 more
core   +3 more sources

Changes in the milk metabolome of the Giant Panda (Ailuropoda melanoleuca) with time after birth: three phases in early lactation and progressive individual differences [PDF]

open access: yes, 2015
Ursids (bears) in general, and giant pandas in particular, are highly altricial at birth. The components of bear milks and their changes with time may be uniquely adapted to nourish relatively immature neonates, protect them from pathogens, and support ...
Hou, Rong   +8 more
core   +3 more sources

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