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  • *Biomass  (2)
  • *Calcification, Physiologic  (1)
  • American Association for the Advancement of Science (AAAS)  (3)
  • National Academy of Sciences
  • 2005-2009  (3)
  • 1990-1994
  • 1980-1984
  • 1965-1969
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Publisher
  • American Association for the Advancement of Science (AAAS)  (3)
  • National Academy of Sciences
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  • 2005-2009  (3)
  • 1990-1994
  • 1980-1984
  • 1965-1969
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  • 1
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-06-02
    Description: The first appearances of aragonite and calcite skeletons in 18 animal clades that independently evolved mineralization during the late Ediacaran through the Ordovician (approximately 550 to 444 million years ago) correspond to intervals when seawater chemistry favored aragonite and calcite precipitation, respectively. Skeletal mineralogies rarely changed once skeletons evolved, despite subsequent changes in seawater chemistry. Thus, the selection of carbonate skeletal minerals appears to have been dictated by seawater chemistry at the time a clade first acquired its mineralized skeleton.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Porter, Susannah M -- New York, N.Y. -- Science. 2007 Jun 1;316(5829):1302.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth Science, University of California at Santa Barbara, Santa Barbara, CA 93106, USA. porter@geol.ucsb.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17540895" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; *Calcification, Physiologic ; Calcium/analysis ; Calcium Carbonate/*analysis ; Chemical Precipitation ; Crystallization ; *Fossils ; Invertebrates/*chemistry ; Magnesium/analysis ; Seawater/*chemistry
    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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  • 2
    Publication Date: 2007-06-16
    Description: Tilman et al. (Reports, 8 December 2006, p. 1598) argued that low-input high-diversity grasslands can provide a substantial proportion of global energy needs. We contend that their conclusions are not substantiated by their experimental protocol. The authors understated the management inputs required to establish prairies, extrapolated globally from site-specific results, and presented potentially misleading energy accounting.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Russelle, Michael P -- Morey, R Vance -- Baker, John M -- Porter, Paul M -- Jung, Hans-Joachim G -- New York, N.Y. -- Science. 2007 Jun 15;316(5831):1567; author reply 1567.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉U.S. Department of Agriculture, Agricultural Research Service, St. Paul, MN 55108, USA. michael.russelle@ars.usda.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17569846" target="_blank"〉PubMed〈/a〉
    Keywords: Agriculture ; *Biomass ; *Carbon/analysis ; Climate ; Ecosystem ; *Energy-Generating Resources ; Fabaceae/growth & development/metabolism ; Plant Development ; *Plants/metabolism ; *Poaceae/growth & development/metabolism ; Soil
    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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  • 3
    Publication Date: 2008-06-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Porter, John R -- Chirinda, Ngonidzashe -- Felby, Claus -- Olesen, Jorgen E -- New York, N.Y. -- Science. 2008 Jun 13;320(5882):1421-2; author reply 1421-2. doi: 10.1126/science.320.5882.1421.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18556534" target="_blank"〉PubMed〈/a〉
    Keywords: *Biomass ; Crops, Agricultural ; Ecosystem ; *Energy-Generating Resources ; Plant Development ; *Plants
    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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