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  • Articles  (462)
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  • Nitrogen
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  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (423)
  • Medicine  (39)
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  • Articles  (462)
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  • 1
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    Ecology. Soil fertility and hunger in Africa (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-03-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sanchez, Pedro A -- New York, N.Y. -- Science. 2002 Mar 15;295(5562):2019-20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉International Center for Research in Agroforestry, Post Office Box 30677, Nairobi, Kenya. P.sanchez@cgiar.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11896257" target="_blank"〉PubMed〈/a〉
    Keywords: Africa South of the Sahara ; Agriculture/*methods ; Biomass ; Crops, Agricultural/*growth & development ; *Ecosystem ; Fertilizers ; *Food Supply ; Forestry ; Humans ; Hunger ; Nitrogen ; Nitrogen Fixation ; Phosphates ; Plant Development ; Public Policy ; *Soil ; Trees/growth & development ; United Nations ; Zea mays/growth & development
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Assessing environmental changes in grasslands (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-03-22
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mitchell, Charles E -- Reich, Peter B -- New York, N.Y. -- Science. 2003 Mar 21;299(5614):1844-5; author reply 1844-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12649464" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; Biomass ; California ; *Carbon Dioxide ; Climate ; *Ecosystem ; Fungi/pathogenicity ; Nitrogen ; *Plant Diseases ; Plant Roots/growth & development ; Poaceae/*growth & development/*microbiology ; Temperature
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Hypoxia, fertilizer, and the Gulf of Mexico (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-05-31
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Snyder, C S -- New York, N.Y. -- Science. 2001 May 25;292(5521):1485-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11379622" target="_blank"〉PubMed〈/a〉
    Keywords: *Agriculture ; Conservation of Natural Resources ; *Fertilizers ; Nitrogen ; *Oxygen ; United States ; *Water Pollutants, Chemical
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Marine biology. Keeping the stygian waters at bay (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-03-10
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ferber, D -- New York, N.Y. -- Science. 2001 Feb 9;291(5506):968-73.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11232575" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Conservation of Natural Resources ; *Ecosystem ; Eutrophication ; *Fertilizers ; Nitrogen ; *Oxygen ; Phytoplankton/physiology ; United States ; *Water Pollutants, Chemical ; Zooplankton/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    Findings from undersea to outer space. Power from pond scum (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-03-25
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaiser, J -- New York, N.Y. -- Science. 2000 Mar 3;287(5458):1581.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10733421" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Chlamydomonas reinhardtii/*metabolism ; Hydrogen/*metabolism ; Nitrogen ; Oxygen/metabolism ; Photosynthesis
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Global biodiversity scenarios for the year 2100 (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-03-10
    Description: Scenarios of changes in biodiversity for the year 2100 can now be developed based on scenarios of changes in atmospheric carbon dioxide, climate, vegetation, and land use and the known sensitivity of biodiversity to these changes. This study identified a ranking of the importance of drivers of change, a ranking of the biomes with respect to expected changes, and the major sources of uncertainties. For terrestrial ecosystems, land-use change probably will have the largest effect, followed by climate change, nitrogen deposition, biotic exchange, and elevated carbon dioxide concentration. For freshwater ecosystems, biotic exchange is much more important. Mediterranean climate and grassland ecosystems likely will experience the greatest proportional change in biodiversity because of the substantial influence of all drivers of biodiversity change. Northern temperate ecosystems are estimated to experience the least biodiversity change because major land-use change has already occurred. Plausible changes in biodiversity in other biomes depend on interactions among the causes of biodiversity change. These interactions represent one of the largest uncertainties in projections of future biodiversity change.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sala, O E -- Chapin, F S 3rd -- Armesto, J J -- Berlow, E -- Bloomfield, J -- Dirzo, R -- Huber-Sanwald, E -- Huenneke, L F -- Jackson, R B -- Kinzig, A -- Leemans, R -- Lodge, D M -- Mooney, H A -- Oesterheld, M -- Poff, N L -- Sykes, M T -- Walker, B H -- Walker, M -- Wall, D H -- New York, N.Y. -- Science. 2000 Mar 10;287(5459):1770-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology and Instituto de Investigaciones Fisiologicas y Ecologicas vinculadas a la Agricultura, Faculty of Agronomy, University of Buenos Aires, Avenida San Martin 4453, Buenos Aires 1417, Argentina. sala@ifeva.edu.ar〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10710299" target="_blank"〉PubMed〈/a〉
    Keywords: Agriculture ; Animals ; Atmosphere ; Carbon Dioxide ; Climate ; *Ecosystem ; Fresh Water ; Models, Biological ; Nitrogen
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    Forecasting agriculturally driven global environmental change (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-04-17
    Description: During the next 50 years, which is likely to be the final period of rapid agricultural expansion, demand for food by a wealthier and 50% larger global population will be a major driver of global environmental change. Should past dependences of the global environmental impacts of agriculture on human population and consumption continue, 10(9) hectares of natural ecosystems would be converted to agriculture by 2050. This would be accompanied by 2.4- to 2.7-fold increases in nitrogen- and phosphorus-driven eutrophication of terrestrial, freshwater, and near-shore marine ecosystems, and comparable increases in pesticide use. This eutrophication and habitat destruction would cause unprecedented ecosystem simplification, loss of ecosystem services, and species extinctions. Significant scientific advances and regulatory, technological, and policy changes are needed to control the environmental impacts of agricultural expansion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tilman, D -- Fargione, J -- Wolff, B -- D'Antonio, C -- Dobson, A -- Howarth, R -- Schindler, D -- Schlesinger, W H -- Simberloff, D -- Swackhamer, D -- New York, N.Y. -- Science. 2001 Apr 13;292(5515):281-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology, Evolution and Behavior, University of Minnesota, 1987 Upper Buford Circle, St. Paul, MN 55108, USA. tilman@lter.umn.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11303102" target="_blank"〉PubMed〈/a〉
    Keywords: *Agriculture ; *Ecosystem ; *Environment ; Eutrophication ; Fertilizers ; Forecasting ; Fresh Water ; Nitrogen ; Pesticides ; Phosphorus ; Regression Analysis
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Planetary science. Exploring other worlds to learn more about our own (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-06-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Muller-Wodarg, Ingo C F -- New York, N.Y. -- Science. 2006 Jun 2;312(5778):1319-20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Space and Atmospheric Physics Group, Imperial College London, London SW7 2BW, UK. i.mueller-wodarg@imperial.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16741101" target="_blank"〉PubMed〈/a〉
    Keywords: *Atmosphere ; Carbon Dioxide ; Earth (Planet) ; Environment ; *Extraterrestrial Environment ; Mars ; Nitrogen ; Oxygen ; *Solar System
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    A clathrate reservoir hypothesis for Enceladus' south polar plume (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-12-16
    Description: We hypothesize that active tectonic processes in the south polar terrain of Enceladus, the 500-kilometer-diameter moon of Saturn, are creating fractures that cause degassing of a clathrate reservoir to produce the plume documented by the instruments on the Cassini spacecraft. Advection of gas and ice transports energy, supplied at depth as latent heat of clathrate decomposition, to shallower levels, where it reappears as latent heat of condensation of ice. The plume itself, which has a discharge rate comparable to Old Faithful Geyser in Yellowstone National Park, probably represents small leaks from this massive advective system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kieffer, Susan W -- Lu, Xinli -- Bethke, Craig M -- Spencer, John R -- Marshak, Stephen -- Navrotsky, Alexandra -- New York, N.Y. -- Science. 2006 Dec 15;314(5806):1764-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geology, University of Illinois at Urbana-Champaign, 1301 West Green Street, Urbana, IL 61801, USA. skieffer@uiuc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17170301" target="_blank"〉PubMed〈/a〉
    Keywords: Carbon Dioxide ; Extraterrestrial Environment ; Gases ; *Ice ; Mathematics ; Methane ; Models, Theoretical ; Nitrogen ; Pressure ; *Saturn ; Spacecraft ; Temperature ; Water
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Planetary science. Enceladus--oasis or ice ball? (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-06-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kieffer, Susan W -- Jakosky, Bruce M -- New York, N.Y. -- Science. 2008 Jun 13;320(5882):1432-3. doi: 10.1126/science.1159702.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geology, University of Illinois, Urbana, IL 61802, USA. skieffer@uiuc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18556539" target="_blank"〉PubMed〈/a〉
    Keywords: Carbon ; Elements ; *Exobiology ; Extraterrestrial Environment ; Hydrogen ; Ice ; *Life ; Nitrogen ; Oxygen ; *Saturn ; *Solar System ; Temperature ; *Water
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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