Results 101 to 110 of about 149,407 (284)

NMR-Based Structural Analysis of Highly Substituted Pyridines From Kondrat'eva Aza-Diels-Alder Cycloadditions. [PDF]

Magn Reson Chem
We report the results from a kinetic and mechanistic investigation of an inverse‐electron‐demand Diels–Alder (IEDDA) cycloaddition involving an oxazole‐type diene synthesized via an Ugi–Zhu multicomponent reaction (UZ‐3CR). ABSTRACT Pyridines are a crucial class of heterocycles with widespread applications in natural products, pharmaceuticals, and ...
Suárez-Moreno GV, Méndez F, Gutierrez-Carrillo A, Rincón-Guevara MA, Amador-Sánchez YA, Islas-Jácome A, González-Zamora E.   +6 more
europepmc   +2 more sources

The planktonic food web in the Gulf of Naples based on the analysis of carbon and nitrogen stable isotope ratios

Marine Ecology, EarlyView., 2023
Abstract Plankton play a key role in marine food webs by producing and transferring organic matter and energy to higher trophic levels. To define the trophic structure and interactions within the planktonic communities in the Gulf of Naples, we determined carbon and nitrogen stable isotope ratios in particulate organic matter (POM, <20 μm ...
Louise Merquiol, Maria Grazia Mazzocchi, Isabella D'Ambra   +2 more
wiley   +1 more source

Confirmation of the Dietary Background of Beef from its Stable Isotope Signature [PDF]

, 2009
End of project reportConsumers are increasingly demanding information on the authenticity and source of the food they purchase. Molecular DNA-based technology allows animal identification, but without certification or a “paper-trail” but does not provide
Bahar, Bojlul, Begley, I.S., Moloney, Aidan P, Monahan, Frank J, Schmidt, Olaf, Scrimgeour, C.M.   +5 more
core  

Coupled channel calculations for the reaction 15N(n, n′)15N∗

Physics Letters B, 1969
Abstract Elastic and inelastic scattering cross sections for the reaction 15 N(n, n′) 15 N ∗ are calculated from 0–12 MeV using the method of coupled channels within a 1 particle-1 hole configuration space. The results are compared with those obtained by other methods of calculation.
C.B. Dover, P. Sandner
openaire   +1 more source

Unlocking fruit dimensions: Quantification of functional traits driving plant–frugivore interactions

Applications in Plant Sciences, EarlyView.
Abstract Fleshy fruits attract animals to ingest fruit, swallow the seeds, and release them in the landscape, thus facilitating seed dispersal and plant regeneration. Attraction of animal dispersers is achieved via attractants such as color or scent, and rewards like sugars, lipids, and micronutrients.
Linh M. N. Nguyen, Evangelia Linda Chronopoulou, Gabriela A. S. Escaliante, Kim Valenta, Omer Nevo   +4 more
wiley   +1 more source

Quantification of total endogenous nitrogen losses in broilers using a minimally invasive 15N-isotope dilution method

Animal
Total endogenous nitrogen (N) losses (ENLs) measurement in broilers is important for quantifying dietary true N digestibility. Basal ENLs are commonly quantified using enzymatically hydrolysed casein (EHC) or EHC-ultrafiltration (EHC-UF), whereas diet ...
M.F. Habibi, S. Dorado-Montenegro, R.P. Kwakkel, W.J.J. Gerrits, A.I. Garcia-Ruiz, S. de Vries   +5 more
doaj   +1 more source

Nitrogen removal during summer and winter in a primary facultative WSP pond: preliminary findings from 15N-labelled ammonium tracking techniques [PDF]

, 2009
Nitrogen removal mechanisms and pathways within WSP have been the focus of much research over the last 30 years. Debates and theories postulated continue to refine our knowledge regarding the cycling and removal pathways for this important nutrient, but ...
Mara, D, Newton, R, van der Linde, E
core  

The Challenging P‐Alkylation of Aromatic Phosphorus Heterocycles and Follow‐Up Reactions

ChemistryEurope, EarlyView.
P‐alkylation of λ3σ2‐phosphinines is hindered by weak nucleophilicity and scarce synthetic access, previously requiring multistep routes or extreme electrophiles. A direct ambient‐condition method is reported using 3,5‐bis(trimethylsilyl)‐phosphinine/B(C6F5)3 with esters or iso(thio)cyanates to generate stable 1‐R‐phosphininium salts.
Samantha Frank, Ádám Horváth, Duy Nguyen, Moritz J. Ernst, Simon Steinhauer, Zoltán Benkő, Christian Müller   +6 more
wiley   +1 more source

7Li(15N,14C)8Be reaction and 13,14C + 8Be nuclei interactions

Ядерна фізика та енергетика, 2017
Angular distributions of the 7Li(15N,14C)8Be reaction were measured at the energy Elab(15N) = 81 MeV. The reaction data were analyzed within coupled-reaction-channels (CRC) method. The 7Li + 15N elastic and inelastic scattering and the more important one-
А. Т. Rudchik, А. А. Rudchik, L. M. Muravynets, K. W. Kemper, К. Rusek, E. І. Koshchy, E. Piasecki, A. Trczinska, Val. М. Pirnak, О. А. Ponkratenko, V. А. Plujko, I. Strojek, A. Stolarz, S. B. Sakuta, А. P. Ilyin, u. M. Stepanenko, . V. Uleshchenko, Yu. O. Shyrma   +17 more
doaj  

Nitrogen Isotope Fractionation During Nitrate and Ammonium Uptake in Maize: Hydroponic Evidence and Implications for Ecological Investigations. [PDF]

Plant Cell Environ
ABSTRACT Understanding nitrogen (N) isotopic fractionation during plant uptake is critical for interpreting δ15N variations in terrestrial ecosystems. We investigated isotopic discrimination during ammonium (NH4+) or nitrate (NO3−) uptake in maize (Zea mays) grown hydroponically under controlled conditions with 0.2 and 2 mM to represent high and low ...
Semaoune P, Templier J, Derenne S, Evans RD, Sebilo M.   +4 more
europepmc   +2 more sources