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  • *Ecosystem  (29)
  • Kinetics  (25)
  • American Association for the Advancement of Science (AAAS)  (54)
  • 2005-2009  (35)
  • 1985-1989  (19)
  • 1980-1984
  • 2006  (35)
  • 1988  (19)
Collection
Keywords
Publisher
  • American Association for the Advancement of Science (AAAS)  (54)
  • Springer  (1)
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  • 2005-2009  (35)
  • 1985-1989  (19)
  • 1980-1984
Year
  • 1
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    Planktonic foraminifera of the California Current reflect 20th-century warming (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-01-10
    Description: It is currently unclear whether observed pelagic ecosystem responses to ocean warming, such as a mid-1970s change in the eastern North Pacific, depart from typical ocean variability. We report variations in planktonic foraminifera from varved sediments off southern California spanning the past 1400 years. Increasing abundances of tropical/subtropical species throughout the 20th century reflect a warming trend superimposed on decadal-scale fluctuations. Decreasing abundances of temperate/subpolar species in the late 20th century indicate a deep, penetrative warming not observed in previous centuries. These results imply that 20th-century warming, apparently anthropogenic, has already affected lower trophic levels of the California Current.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Field, David B -- Baumgartner, Timothy R -- Charles, Christopher D -- Ferreira-Bartrina, Vicente -- Ohman, Mark D -- New York, N.Y. -- Science. 2006 Jan 6;311(5757):63-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093, USA. dfield@mbari.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16400144" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; California ; *Climate ; *Ecosystem ; Environment ; *Eukaryota/classification ; *Geologic Sediments ; Greenhouse Effect ; Population Density ; Population Dynamics ; Principal Component Analysis ; Seasons ; Temperature ; Time Factors ; *Zooplankton/classification
    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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    The dynamic energy landscape of dihydrofolate reductase catalysis (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-09-16
    Description: We used nuclear magnetic resonance relaxation dispersion to characterize higher energy conformational substates of Escherichia coli dihydrofolate reductase. Each intermediate in the catalytic cycle samples low-lying excited states whose conformations resemble the ground-state structures of preceding and following intermediates. Substrate and cofactor exchange occurs through these excited substates. The maximum hydride transfer and steady-state turnover rates are governed by the dynamics of transitions between ground and excited states of the intermediates. Thus, the modulation of the energy landscape by the bound ligands funnels the enzyme through its reaction cycle along a preferred kinetic path.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Boehr, David D -- McElheny, Dan -- Dyson, H Jane -- Wright, Peter E -- GM56879/GM/NIGMS NIH HHS/ -- GM75995/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Sep 15;313(5793):1638-42.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology and Skaggs Institute for Chemical Biology, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16973882" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Catalysis ; Escherichia coli/*enzymology ; Kinetics ; Ligands ; Models, Molecular ; NADP/metabolism ; Nuclear Magnetic Resonance, Biomolecular ; Protein Binding ; *Protein Conformation ; Tetrahydrofolate Dehydrogenase/*chemistry/*metabolism ; Tetrahydrofolates/metabolism ; Thermodynamics
    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
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    Long-term sustainability of a high-energy, low-diversity crustal biome (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-10-21
    Description: Geochemical, microbiological, and molecular analyses of alkaline saline groundwater at 2.8 kilometers depth in Archaean metabasalt revealed a microbial biome dominated by a single phylotype affiliated with thermophilic sulfate reducers belonging to Firmicutes. These sulfate reducers were sustained by geologically produced sulfate and hydrogen at concentrations sufficient to maintain activities for millions of years with no apparent reliance on photosynthetically derived substrates.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lin, Li-Hung -- Wang, Pei-Ling -- Rumble, Douglas -- Lippmann-Pipke, Johanna -- Boice, Erik -- Pratt, Lisa M -- Sherwood Lollar, Barbara -- Brodie, Eoin L -- Hazen, Terry C -- Andersen, Gary L -- DeSantis, Todd Z -- Moser, Duane P -- Kershaw, Dave -- Onstott, T C -- New York, N.Y. -- Science. 2006 Oct 20;314(5798):479-82.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geosciences, Princeton University, Princeton, NJ, USA. lhlin@ntu.edu.tw〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17053150" target="_blank"〉PubMed〈/a〉
    Keywords: Bacteria/classification/*isolation & purification/*metabolism ; Biodiversity ; DNA, Ribosomal/analysis/genetics ; *Ecosystem ; Gold ; Hydrogen/analysis/metabolism ; Mining ; Oligonucleotide Array Sequence Analysis ; Oxidation-Reduction ; Phylogeny ; RNA, Ribosomal, 16S/genetics ; South Africa ; Sulfates/*metabolism ; Temperature ; Thermodynamics ; Time ; *Water Microbiology
    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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  • 4
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    Post-fire logging debate ignores many issues (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-10-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉DellaSala, Dominick A -- Karr, James R -- Schoennagel, Tania -- Perry, Dave -- Noss, Reed F -- Lindenmayer, David -- Beschta, Robert -- Hutto, Richard L -- Swanson, Mark E -- Evans, Jon -- New York, N.Y. -- Science. 2006 Oct 6;314(5796):51-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17023633" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Ecosystem ; Environment ; *Fires ; *Forestry ; *Trees
    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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    Marine parks need sharks? (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-04-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chapman, Demian D F -- Pikitch, Ellen K -- Babcock, Elizabeth A -- New York, N.Y. -- Science. 2006 Apr 28;312(5773):526-8; author reply 526-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16645076" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Anthozoa ; Biomass ; Caribbean Region ; *Conservation of Natural Resources ; *Ecosystem ; Fisheries ; *Fishes ; Predatory Behavior ; *Sharks
    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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    Ongoing threats to endemic species (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-04-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Scott, J Michael -- Goble, Dale D -- New York, N.Y. -- Science. 2006 Apr 28;312(5773):526.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16645074" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Conservation of Natural Resources ; *Ecosystem ; Environment ; Erythrina/growth & development/*parasitology ; Hawaii ; Wasps/*pathogenicity
    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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    Top-down vs. bottom-up effects in kelp forests (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-09-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Foster, Michael S -- Edwards, Matthew S -- Reed, Daniel C -- Schiel, David R -- Zimmerman, Richard C -- New York, N.Y. -- Science. 2006 Sep 22;313(5794):1737-9; author reply 1737-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16990533" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; California ; Climate ; *Ecosystem ; Eukaryota ; Fishes ; Food Chain ; Invertebrates ; *Kelp ; *Seawater
    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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    Comment on "Statistical independence of escalatory ecological trends in Phanerozoic marine invertebrates" (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-11-11
    Description: The analysis of Madin et al. (Reports, 12 May 2006, p. 897) of Phanerozoic diversity failed to support expected correlations between carnivores and noncarnivores, leading the authors to reject escalation as an important macroevolutionary process. The test, however, is based on a flawed model of causality, and the ecological groups are improperly delineated with regard to the hypothesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roopnarine, Peter D -- Angielczyk, Kenneth D -- Hertog, Rachel -- New York, N.Y. -- Science. 2006 Nov 10;314(5801):925; author reply 925.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Invertebrate Zoology and Geology, California Academy of Sciences, 875 Howard Street, San Francisco, CA 94103, USA. proopnarine@calacademy.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17095679" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Biological ; Animals ; Biodiversity ; *Biological Evolution ; *Ecosystem ; *Fossils ; *Invertebrates ; Predatory Behavior ; *Seawater ; Statistics as Topic
    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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    Opposing effects of native and exotic herbivores on plant invasions (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-03-11
    Description: Exotic species are widely assumed to thrive because they lack natural enemies in their new ranges. However, a meta-analysis of 63 manipulative field studies including more than 100 exotic plant species revealed that native herbivores suppressed exotic plants, whereas exotic herbivores facilitated both the abundance and species richness of exotic plants. Both outcomes suggest that plants are especially susceptible to novel, generalist herbivores that they have not been selected to resist. Thus, native herbivores provide biotic resistance to plant invasions, but the widespread replacement of native with exotic herbivores eliminates this ecosystem service, facilitates plant invasions, and triggers an invasional "meltdown."〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Parker, John D -- Burkepile, Deron E -- Hay, Mark E -- New York, N.Y. -- Science. 2006 Mar 10;311(5766):1459-61.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Biology, Georgia Institute of Technology, Atlanta, GA 30332, USA. jdp52@cornell.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16527979" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biodiversity ; Ecology ; *Ecosystem ; Feeding Behavior ; Invertebrates/physiology ; *Plant Physiological Phenomena ; Vertebrates/physiology
    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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    Induction of an antibody that catalyzes the hydrolysis of an amide bond (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-09-02
    Description: Catalysis of amide bond hydrolysis is of singular importance in enzymology. An antibody was induced to an analog of a high-energy intermediate anticipated along the reaction coordinate of amide hydrolysis. This antibody is an amidase with high specificity and a large rate enhancement (250,000) relative to the uncatalyzed reaction. This reaction represents the kinetically most difficult hydrolysis reaction yet catalyzed by an antibody.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Janda, K D -- Schloeder, D -- Benkovic, S J -- Lerner, R A -- New York, N.Y. -- Science. 1988 Sep 2;241(4870):1188-91.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, Research Institute of Scripps Clinic, La Jolla, CA 92037.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3413482" target="_blank"〉PubMed〈/a〉
    Keywords: Amidohydrolases/metabolism ; Animals ; Antibodies, Monoclonal/biosynthesis/*physiology ; Antibody Specificity ; Antigens/immunology ; *Catalysis ; Chemical Phenomena ; Chemistry ; Hemocyanin/analogs & derivatives/immunology ; Hydrolysis ; Immunization ; Kinetics ; Mice ; Organophosphorus Compounds/immunology ; Substrate Specificity
    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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