Results 71 to 80 of about 95,714 (157)

The Dual Origin of the Terrestrial Atmosphere

, 2003
The origin of the terrestrial atmosphere is one of the most puzzling enigmas in the planetary sciences. It is suggested here that two sources contributed to its formation, fractionated nebular gases and accreted cometary volatiles.
Abe, Anders, Ballentine, Balsiger, Bar-Nun, Bar-Nun, Benz, Bockelée-Morvan, Burnard, Busemann, Caffee, Chen, Chyba, Chyba, Dauphas, Dauphas, Dauphas, Dauphas, Dauphas, Dauphas, Delsemme, Delsemme, Eberhardt, Holland, Honda, Honda, Hunten, Hunten, Ihaka, Iro, Jagoutz, Kerridge, Kimura, Kleine, Kunz, Laufer, Marty, Marty, Marty, Maréchal, Mathew, Mathew, Matsui, Matsumoto, Mazor, Meier, Meisel, Meisel, Morbidelli, Moreira, Moreira, Nicolas Dauphas, Notesco, Notesco, Owen, Owen, Owen, Owen, Ozima, Ozima, Ozima, Pepin, Pepin, Pepin, Pepin, Pepin, Pepin, Podosek, Porcelli, Porcelli, Press, Sagan, Sarda, Sasaki, Schoenberg, Shoemaker, Swindle, Swindle, Tolstikhin, Trieloff, Walker, Wieler, Wieler, Yamamoto, Yin, Yokochi, Zahnle, Zahnle, Zahnle, Zahnle, Zahnle, Zhang   +91 more
core   +1 more source

Morphological and dietary responses of chipmunks to a century of climate change. [PDF]

, 2016
Predicting how individual taxa will respond to climatic change is challenging, in part because the impacts of environmental conditions can vary markedly, even among closely related species.
Adams, Allen, Ben-David, Ben-David, Besnard, Best, Bookstein, Botti, Brown, Burnett, Burnham, Caumul, Chen, Cheverud, Clawson, Clawson, Craig, Craine, Crimmins, Dawson, Dawson, Eastman, Edwards, Elbroch, Falconer, Fry, Goodall, Grieco, Grinnell, Hammond, Hanken, Hendry, Hijmans, Holm, Ingles, Keeling, Kelly, Klingenberg, Koch, Kopp, Lande, Lande, Lenoir, Lessels, Lynch, Marroig, Marshall, McIntyre, Millien, Monteiro, Moritz, Mousseau, O'Connell, Ozgul, Parmesan, Parmesan, Patton, Pergams, Pergams, Post, Rohlf, Root, Roux, Rowe, Rubidge, Rubidge, Sage, Schmidt-Nielsen, Smith, Staudinger, Thorne, Tingley, Wigginton, Yom-Tov, Zelditch, Zuur   +75 more
core   +1 more source

Nitrogen isotope effects induced by anammox bacteria [PDF]

Proceedings of the National Academy of Sciences, 2013
Significance Nitrogen is essential for all organisms and limits primary production in the ocean. It is mainly lost from low-oxygen environments by the activity of microorganisms that convert fixed nitrogen to N 2 gas.
Brunner, Benjamin, Contreras, Sergio, Lehmann, Moritz F., Matantseva, Olga, Rollog, Mark, Kalvelage, Tim, Klockgether, Gabriele, Lavik, Gaute, Jetten, Mike S. M., Kartal, Boran, Kuypers, Marcel M. M.   +10 more
openaire   +5 more sources

A basin‐wide carbon‐related proxy dataset in arid China

Geoscience Data Journal
Closed basin accounts for about one‐fifth of the global land area and is an important part of the global terrestrial carbon cycle. Due to its relatively close geographical environment and independent carbon cycling system, it is an ideal place to study ...
Yu Li, Yaxin Xue, Mingjun Gao, Zhansen Zhang, Simin Peng, Junjie Duan   +5 more
doaj   +1 more source

Trophic interactions of meso- and macrozooplankton and fish in the Iceland Sea as evaluated by fatty acid and stable isotope analysis [PDF]

, 2012
A trophic study was carried out in August of 2007 and 2008 on the pelagic ecosystem in the Subarctic Iceland Sea. Carbon and nitrogen stable isotopes and fatty acid biomarkers were used to study trophic linkages and the trophic ecology of the most ...
Falk Petersen, Stig, Gislason, Astthor, Petursdottir, Hildur   +2 more
core   +1 more source

The composition of the protosolar disk and the formation conditions for comets [PDF]

, 2015
Conditions in the protosolar nebula have left their mark in the composition of cometary volatiles, thought to be some of the most pristine material in the solar system.
A. Dutrey, A. Kouchi, A.E. Glassgold, A.G.G.M. Tielens, A.I. Vasyunin, A.L. Cochran, A.N. Heays, A.Z. Dolginov, B. Silvi, B.P. Bonev, B.P. Bonev, B.P. Bonev, C. Alexander, C. Ceccarelli, C. Ceccarelli, C. Ceccarelli, C. Dominik, C. Qi, C. Qi, C. Qi, C. Qi, C. Salyk, C. Tornow, C. Tornow, C. Tornow, C. Walsh, C. Walsh, C.E. Woodward, C.P. Dullemond, D. Bockelée-Morvan, D. Bockelée-Morvan, D. Bockelée-Morvan, D. Bockelée-Morvan, D. Bockelée-Morvan, D. Gautier, D. Harsono, D. Heinzeller, D. Hutsemékers, D. Kozlowski, D. Semenov, D. Semenov, D.C. Lis, E. Gibb, E. Herbst, E. Jehin, E. Lellouch, E. Roueff, E. S. Wirström, E. Zicler, E.D. Young, E.K. Jessberger, E.L. Gibb, E.S. Wirström, E.S. Wirström, F. Hersant, F. Pauzat, F.C. Adams, F.J. Ciesla, F.J. Ciesla, G. Buntkowsky, G. Bussolin, G. Cremonese, G. Kresse, G. Kresse, G. Notesco, G.J. Flynn, G.J. Villanueva, G.L. Villanueva, G.S. Mathews, H. Kawakita, H. Kawakita, H. Kawakita, H. Kawakita, H. Yurimoto, H. Yurimoto, I. Gregorio-Monsalvo de, I. Pater de, I. Pater de, J. Crovisier, J. Crovisier, J. Crovisier, J. Crovisier, J. Crovisier, J. Schönke, J.-E. Lee, J.C. Mottram, J.E. Heidenreich III, J.F. Hawley, J.F. Hawley, J.I. Lunine, J.J. Kavelaars, J.K.J. Fogel, J.P. Perdew, J.R. Lyons, J.R. Najita, J.S. Carr, J.S. Lewis, J.S. Mathis, K. Altwegg, K. France, K. Hashimoto, K. Nagashima, K. Saigo, K. Willacy, K. Willacy, K. Willacy, K. Willacy, K. Willacy, K. Willacy, K.D. McKeegan, K.I. Öberg, K.M. Chick, K.M. Pontoppidan, K.M. Pontoppidan, K.M. Pontoppidan, K.M. Pontoppidan, K.Y. Furuya, L. Pagani, L. Paganini, L. Podio, L.I. Cleeves, L.I. Cleeves, L.I. Cleeves, L.R. Nittler, M. Ali-Dib, M. Ali-Dib, M. Asplund, M. Calatayud, M. Doronin, M. Hassig, M. Ilgner, M. Ilgner, M. Ilgner, M. Pettini, M.A. DiSanti, M.F. A’Hearn, M.J. Mumma, M.J. Mumma, M.J. Mumma, M.R. Hogerheijde, M.V. Persson, N. Biver, N. Dello Russo, N. Dello Russo, N. Dello Russo, N. Fray, N. Iro, N. Watanabe, N.J. Turner, N.J. Turner, N.J. Turner, O. Mousis, O. Mousis, O. Mousis, O. Mousis, O. Mousis, O. Mousis, O. Mousis, O. Mousis, O. Mousis, O. Mousis, O. Mousis, P. Caselli, P. D’Alessio, P. Eberhardt, P. Eberhardt, P. Gast, P. Hartogh, P. Theulé, P.M. Woods, P.M. Woods, R. Hueso, R. Llusar, R. Meier, R. Meier, R. Visser, R. Visser, R. Visser, R.N. Clayton, R.N. Clayton, S. B. Charnley, S. Casassa, S. Casassa, S. Grimme, S. Gulkis, S. Inutsuka, S. N. Milam, S. Wyckoff, S.A. Balbus, S.B. Charnley, S.B. Charnley, S.B. Charnley, S.B. Charnley, S.B. Charnley, S.D. Rodgers, S.E. Dodson-Robinson, T. Albertsson, T. Albertsson, T. Albertsson, T. Bredichin, T. Hama, T. Lee, T. Owen, T.J. Millar, Th. Henning, U. Marboeuf, U. Marboeuf, U. Marboeuf, V. Akimkin, V. Taquet, V. Taquet, V. Wakelam, V. Zubko, W.-H. Ip, W.D. Langer, W.M. Irvine, Y. Aikawa, Y. Aikawa, Y. Aikawa, Y. Aikawa, Y. Aikawa, Y. Aikawa, Y. Alibert, Y. Alibert, Y. Ellinger, Y. Ellinger, Y. Shinnaka, Y.L. Radeva   +227 more
core   +3 more sources

Food webs in forest and pasture streams in the Waikato region, New Zealand: A study based on analyses of stable isotopes of carbon and nitrogen, and fish gut contents. [PDF]

, 1997
Stable isotopes of carbon (C) and nitrogen (N) were studied in 11 stream communities in the Waikato region of New Zealand. From comparisons of mean d13C and d15N values, food webs in the shaded, forest streams were clearly based on allochthonous material
Biggs B., Lester P. J., Main M. L.
core   +2 more sources

Identification of nitrate sources and transformation in karst cave water using hydrochemistry and NO3− isotopes (δ15N/δ18O) combined with a Bayesian mixing model

All Earth
Nitrogen mainly exists as nitrate in aqueous environments. In karst areas, nitrate pollution caused by anthropogenic activities severely endangers aqueous systems.
Dan Su, Zhongfa Zhou, Xiaohuan Gong, Lihui Yan, Shengjun Ding, Hui Dong, Ye Zhang, Xiaoduo Wang   +7 more
doaj   +1 more source

Composite Millicharged Dark Matter

, 2013
We study a composite millicharged dark matter model. The dark matter is in the form of pion-like objects emerging from a higher scale QCD-like theory.
Kouvaris, Chris
core   +1 more source

The Nitrogen Isotopic Composition of Tissue and Shell‐Bound Organic Matter of Planktic Foraminifera in Southern Ocean Surface Waters

Geochemistry, Geophysics, Geosystems, 2020
We present the first nitrogen isotope (δ15N) measurements of planktic foraminifera, paleoceanographically important zooplankton, from the nutrient‐rich waters of the modern Southern Ocean. Foraminifera were collected from net tows in the Subantarctic and
Sandi M. Smart, Sarah E. Fawcett, Haojia Ren, Ralf Schiebel, Emily M. Tompkins, Alfredo Martínez‐García, Luca Stirnimann, Alakendra Roychoudhury, Gerald H. Haug, Daniel M. Sigman   +9 more
doaj   +1 more source