Results 71 to 80 of about 149,407 (284)

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., Mulholland, Patrick J., Peterson, Bruce J., Sanzone, Diane M., Tank, Jennifer L., Webster, Jackson R., Wollheim, Wilfred M.   +6 more
core   +1 more source

Solving the woolly mammoth conundrum: amino acid 15N-enrichment suggests a distinct forage or habitat [PDF]

, 2015
Understanding woolly mammoth ecology is key to understanding Pleistocene community dynamics and evaluating the roles of human hunting and climate change in late Quaternary megafaunal extinctions. Previous isotopic studies of mammoths’ diet and physiology
Longstaffe, Fred J, Metcalfe, Jessica Z, Schwartz-Narbonne, Rachel, Zazula, Grant   +3 more
core   +2 more sources

A Perspective on the Applications of Triphasic Gas Storage in Electrochemical Systems

Advanced Science, EarlyView.
Gas storage in microporous materials positioned locally at an electrode or electrocatalyst surface enhances electrochemical processes. Abstract Microporous materials store gases under dry conditions (e.g., hydrogen or oxygen via physisorption), but in some cases microporous materials also show triphasic (e.g., in a solid|gas|liquid system) gas storage ...
Zhongkai Li, Corin T. Scott, Taku Suzuki‐Osborne, John P. Lowe, Dominic Taylor, Mariolino Carta, Neil B. McKeown, Andrew D. Burrows, Lucia H. Mascaro, Frank Marken   +9 more
wiley   +1 more source

Pyridine Into Pyrrole Transformation Induced Within the Confinement of the Macrocycle

Angewandte Chemie, EarlyView.
This work demonstrates the nontrivial reactivity of pyridine incorporated into a porphyrin framework. The most significant achievement is the contraction of the six‐membered ring to a pyrrole ring, which is a phenomenon of great interest to researchers in this field.
Paulina Krzyszowska, Agata Burska‐Jabłońska, Mateusz Oberski, Michał J. Białek, Lechosław Latos‐Grażyński, Karolina Hurej   +5 more
wiley   +2 more sources

Elastic and inelastic scattering of 15n ions by 11B at 84 MeV [PDF]

Ядерна фізика та енергетика, 2014
Angular distributions of the 11B + 15N elastic and inelastic scattering were measured at Elab (15N) = 84 MeV. The data were analyzed within the optical model and coupled-reaction-channels method.
A. T. Rudchik, O. V. Herashchenko, K. A. Chercas, A. A. Rudchik, S. Kliczewski, Val. M. Pirnak, E. Piasecki, K. Rusek, A. Trczińska, S. B. Sakuta, R. Siudak, I. Strojek, A. Stolarz, E. I. Koshchy, A. O. Barabash, A. P. Ilyin, O. A. Ponkratenko, Yu. M. Stepanenko, V. V. Uleshchenko, Yu. O. Shyrma, J. Choiński, A. Szczurek   +21 more
doaj  

Recuperação do nitrogênio (15N) da uréia e da palhada por soqueira de cana-de-açúcar (Saccharum spp.) [PDF]

Revista Brasileira de Ciência do Solo, 2003
Desenvolveu-se um experimento com vistas em avaliar a utilização do nitrogênio mineralizado da palhada (15N) e do nitrogênio da uréia (15N) aplicada em soqueira de cana-de-açúcar.
G. J. C. Gava, P. C. O. Trivelin, A. C. Vitti, M. W. Oliveira   +3 more
doaj   +1 more source

Isotopic fractionation of carbon, deuterium and nitrogen : a full chemical study

, 2015
Context. The increased sensitivity and high spectral resolution of millimeter telescopes allow the detection of an increasing number of isotopically substituted molecules in the interstellar medium. The 14N/ 15N ratio is difficult to measure directly for
Hickson, K. M., Loison, J. C., Roueff, E.   +2 more
core   +2 more sources

Measurement of 1323 and 1487 keV resonances in 15N({\alpha}, {\gamma})19F with the recoil separator ERNA [PDF]

, 2017
The origin of fluorine is a widely debated issue. Nevertheless, the ^{15}N({\alpha},{\gamma})^{19}F reaction is a common feature among the various production channels so far proposed.
Best, A., Buompane, R., CRISTALLO, Sergio, D'Onofrio, A., De Cesare, M., Di Leva, A., Duarte, J. G., ERNA Collaboration, Gasques, L. R., Gialanella, L., Imbriani, G., Morales-Gallegos, L., Pezzella, A., Porzio, G., Rapagnani, D., Roca, V., Romoli, M., Schürmann, D., STRANIERO, Oscar, Terrasi, F.   +19 more
core   +2 more sources

Generating Dynamic Structures Through Physics‐Based Sampling of Predicted Inter‐Residue Geometries

Advanced Science, EarlyView.
While static structure prediction has been revolutionized, modeling protein dynamics remains elusive. trRosettaX2‐Dynamics is presented to address this challenge. This framework leverages a Transformer‐based network to predict inter‐residue geometric constraints, guiding conformation generation via physics‐based iterative sampling. The resulting method
Chenxiao Xiang, Wenkai Wang, Zhenling Peng, Jianyi Yang   +3 more
wiley   +1 more source

Effect of four plant species on soil 15N-access and herbage yield in temporary agricultural grasslands [PDF]

, 2013
Positive plant diversity-productivity relationships have been reported for experimental semi-natural grasslands (Cardinale et al. 2006; Hector et al. 1999; Tilman et al. 1996) as well as temporary agricultural grasslands (Frankow-Lindberg et al.
A Hector, A Hector, A Jumpponen, AH Fitter, BE Frankow-Lindberg, BJ Cardinale, C Palmborg, C Roscher, D Nyfeler, D Nyfeler, D Tilman, D Tilman, DC Whitehead, DS Powlson, F Paynel, F Wichern, G Carlsson, G Hardarson, G Hardarson, H Høgh-Jensen, H Høgh-Jensen, H. Høgh-Jensen, HE Brown, HJ Boeck De, HL Kristensen, J Rasmussen, J Ruijven van, J. Eriksen, J. Rasmussen, J. Rasmussen, K Pirhofer-Walzl, K Thorup-Kristensen, K. Pirhofer-Walzl, K. Søegaard, KJ Moore, KM Pollock, L Kirwan, L Kutschera, L Kutschera, L Mommer, M Braun, M Fried, M Scherer-Lorenzen, MA Huston, MB Peoples, PM Chalk, RH Skinner, S Felten von, S Felten von, S Felten von, S Naeem, SA Schnitzer, TE Crews, VD Picasso   +53 more
core   +1 more source