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  • Articles  (299)
  • Temperature  (299)
  • American Association for the Advancement of Science (AAAS)  (299)
  • Wiley-Blackwell
  • 2000-2004  (299)
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  • Articles  (299)
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  • American Association for the Advancement of Science (AAAS)  (299)
  • Wiley-Blackwell
  • Springer  (14)
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  • 1
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    Climate change and latitudinal patterns of intertidal thermal stress (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-11-02
    Description: The interaction of climate and the timing of low tides along the West Coast of the United States creates a complex mosaic of thermal environments, in which northern sites can be more thermally stressful than southern sites. Thus, climate change may not lead to a poleward shift in the distribution of intertidal organisms, as has been proposed, but instead will likely cause localized extinctions at a series of "hot spots." Patterns of exposure to extreme climatic conditions are temporally variable, and tidal predictions suggest that in the next 3 to 5 years "hot spots" are likely to appear at several northern sites.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Helmuth, Brian -- Harley, Christopher D G -- Halpin, Patricia M -- O'Donnell, Michael -- Hofmann, Gretchen E -- Blanchette, Carol A -- New York, N.Y. -- Science. 2002 Nov 1;298(5595):1015-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of South Carolina, Department of Biological Sciences and Marine Sciences Program, Columbia, SC 29208, USA. helmuth@biol.sc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12411702" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bivalvia/*physiology ; *Body Temperature ; *Climate ; *Ecosystem ; Environment ; Geography ; Pacific Ocean ; Pacific States ; Seasons ; *Seawater ; Temperature ; *Water Movements
    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
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    The California Current, Devils Hole, and Pleistocene climate (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-04-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Winograd, Isaac J -- New York, N.Y. -- Science. 2002 Apr 5;296(5565):7 discussion 7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉U.S. Geological Survey, 432 National Center, 12201 Sunrise Valley Drive, Reston, VA 20192, USA. ijwinogr@usgs.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11934990" target="_blank"〉PubMed〈/a〉
    Keywords: California ; *Climate ; Geologic Sediments ; Ice ; Nevada ; Oceans and Seas ; Oxygen Isotopes ; Seawater ; Temperature ; Time
    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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    Chloride methylation by plant pectin: an efficient environmentally significant process (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-07-12
    Description: Atmospheric chloromethane (CH3Cl) plays an important role in stratospheric ozone destruction, but many uncertainties exist regarding the strengths of its sources and sinks and particularly regarding the processes generating this naturally occurring gas. Evidence is presented here that CH3Cl is produced in many terrestrial environments by a common mechanism. Abiotic conversion of chloride to CH3Cl occurs readily in plant material, with the widespread plant component pectin acting as a methyl donor. Significant CH3Cl emissions from senescent and dead leaves were observed at ambient temperatures; those emissions rose dramatically when temperatures increased. This ubiquitous process acting in terrestrial ecosystems and during biomass burning could contribute the bulk of atmospheric CH3Cl.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hamilton, John T G -- McRoberts, W Colin -- Keppler, Frank -- Kalin, Robert M -- Harper, David B -- New York, N.Y. -- Science. 2003 Jul 11;301(5630):206-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Agriculture and Rural Development for Northern Ireland, Newforge Lane, Belfast BT9 5PX, UK. jack.hamilton@dardni.gov.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12855805" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; *Biomass ; Chlorides/*chemistry ; Ecosystem ; Methyl Chloride/*chemistry ; Methylation ; Pectins/*chemistry ; Plant Leaves/*chemistry ; Poaceae/chemistry ; Temperature ; Volatilization ; Water/analysis ; Wood
    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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    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
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  • 5
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    Biomolecular interactions at phospholipid-decorated surfaces of liquid crystals (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-12-20
    Description: The spontaneous assembly of phospholipids at planar interfaces between thermotropic liquid crystals and aqueous phases gives rise to patterned orientations of the liquid crystals that reflect the spatial and temporal organization of the phospholipids. Strong and weak specific-binding events involving proteins at these interfaces drive the reorganization of the phospholipids and trigger orientational transitions in the liquid crystals. Because these interfaces are fluid, processes involving the lateral organization of proteins (such as the formation of protein- and phospholipid-rich domains) are also readily imaged by the orientational response of the liquid crystal, as are stereospecific enzymatic events. These results provide principles for label-free monitoring of aqueous streams for molecular and biomolecular species without the need for complex instrumentation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brake, Jeffrey M -- Daschner, Maren K -- Luk, Yan-Yeung -- Abbott, Nicholas L -- New York, N.Y. -- Science. 2003 Dec 19;302(5653):2094-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemical and Biological Engineering, University of Wisconsin, Madison, 1415 Engineering Drive, Madison, WI 53706-1607, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14684814" target="_blank"〉PubMed〈/a〉
    Keywords: 1,2-Dipalmitoylphosphatidylcholine/chemistry ; Biphenyl Compounds/*chemistry ; Calcium ; Catalysis ; Crystallization ; Fluorescence ; Glass ; Gold ; Hydrolysis ; Micelles ; Nitriles/*chemistry ; Phosphatidylcholines/chemistry ; Phospholipases A/*metabolism ; Phospholipids/*chemistry ; Quaternary Ammonium Compounds/chemistry ; Silanes/chemistry ; Temperature ; Water/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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  • 6
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    Response of a deciduous forest to the Mount Pinatubo eruption: enhanced photosynthesis (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-03-29
    Description: Volcanic aerosols from the 1991 Mount Pinatubo eruption greatly increased diffuse radiation worldwide for the following 2 years. We estimated that this increase in diffuse radiation alone enhanced noontime photosynthesis of a deciduous forest by 23% in 1992 and 8% in 1993 under cloudless conditions. This finding indicates that the aerosol-induced increase in diffuse radiation by the volcano enhanced the terrestrial carbon sink and contributed to the temporary decline in the growth rate of atmospheric carbon dioxide after the eruption.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gu, Lianhong -- Baldocchi, Dennis D -- Wofsy, Steve C -- Munger, J William -- Michalsky, Joseph J -- Urbanski, Shawn P -- Boden, Thomas A -- New York, N.Y. -- Science. 2003 Mar 28;299(5615):2035-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Environmental Sciences Division, Building 1509, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6335, USA. lianhong-gu@ornl.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12663919" target="_blank"〉PubMed〈/a〉
    Keywords: Aerosols ; *Atmosphere ; *Carbon Dioxide/metabolism ; Climate ; *Ecosystem ; Mathematics ; Models, Statistical ; Nonlinear Dynamics ; Philippines ; *Photosynthesis ; Regression Analysis ; Scattering, Radiation ; Seasons ; Sunlight ; Temperature ; Trees/*metabolism ; *Volcanic Eruptions
    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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    Comprehensive identification of human bZIP interactions with coiled-coil arrays (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-06-14
    Description: In eukaryotes, the combinatorial association of sequence-specific DNA binding proteins is essential for transcription. We have used protein arrays to test 492 pairings of a nearly complete set of coiled-coil strands from human basic-region leucine zipper (bZIP) transcription factors. We find considerable partnering selectivity despite the bZIPs' homologous sequences. The interaction data are of high quality, as assessed by their reproducibility, reciprocity, and agreement with previous observations. Biophysical studies in solution support the relative binding strengths observed with the arrays. New associations provide insights into the circadian clock and the unfolded protein response.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Newman, John R S -- Keating, Amy E -- New York, N.Y. -- Science. 2003 Jun 27;300(5628):2097-101. Epub 2003 Jun 12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12805554" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Basic-Leucine Zipper Transcription Factors ; Chromatography, High Pressure Liquid ; Circadian Rhythm ; Circular Dichroism ; Cyclic AMP Response Element-Binding Protein/chemistry/metabolism ; DNA-Binding Proteins/chemistry/isolation & purification/*metabolism ; Dimerization ; G-Box Binding Factors ; Humans ; *Leucine Zippers ; Peptides/chemistry/isolation & purification/metabolism ; *Protein Array Analysis ; Protein Binding ; Protein Folding ; Protein Structure, Tertiary ; Signal Transduction ; Temperature ; Thermodynamics ; Transcription Factors/*chemistry/isolation & purification/*metabolism
    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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    Coral reef death during the 1997 Indian Ocean Dipole linked to Indonesian wildfires (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-08-16
    Description: Geochemical anomalies and growth discontinuities in Porites corals from western Sumatra, Indonesia, record unanticipated reef mortality during anomalous Indian Ocean Dipole upwelling and a giant red tide in 1997. Sea surface temperature reconstructions show that although some past upwelling events have been stronger, there were no analogous episodes of coral mortality during the past 7000 years, indicating that the 1997 red tide was highly unusual. We show that iron fertilization by the 1997 Indonesian wildfires was sufficient to produce the extraordinary red tide, leading to reef death by asphyxiation. These findings highlight tropical wildfires as an escalating threat to coastal marine ecosystems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Abram, Nerilie J -- Gagan, Michael K -- McCulloch, Malcolm T -- Chappell, John -- Hantoro, Wahyoe S -- New York, N.Y. -- Science. 2003 Aug 15;301(5635):952-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia. nerilie.abram@anu.edu.au〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12920295" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Anthozoa/*growth & development ; Atmosphere ; Biomass ; Dinoflagellida/growth & development ; *Ecosystem ; *Eutrophication ; *Fires ; Indian Ocean ; Indonesia ; Iron ; Phytoplankton/growth & development ; Population Dynamics ; Temperature
    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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    Catalytic reduction of dinitrogen to ammonia at a single molybdenum center (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-07-05
    Description: Dinitrogen (N2) was reduced to ammonia at room temperature and 1 atmosphere with molybdenum catalysts that contain tetradentate [HIPTN3N]3- triamidoamine ligands (such as [HIPTN3N]Mo(N2), where [HIPTN3N]3- is [(3,5-(2,4,6-i-Pr3C6H2)2C6H3NCH2CH2)3N]3-) in heptane. Slow addition of the proton source [(2,6-lutidinium)(BAr'4), where Ar' is 3,5-(CF3)2C6H3]and reductant (decamethyl chromocene) was critical for achieving high efficiency ( approximately 66% in four turnovers). Numerous x-ray studies, along with isolation and characterization of six proposed intermediates in the catalytic reaction under noncatalytic conditions, suggest that N2 was reduced at a sterically protected, single molybdenum center that cycled from Mo(III) through Mo(VI) states.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yandulov, Dmitry V -- Schrock, Richard R -- GM 31978/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2003 Jul 4;301(5629):76-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12843387" target="_blank"〉PubMed〈/a〉
    Keywords: Ammonia/*chemistry ; Atmospheric Pressure ; Catalysis ; Chromium/chemistry ; Electrons ; Ligands ; Magnetic Resonance Spectroscopy ; Molybdenum/*chemistry ; Nitrogen/*chemistry ; Nitrogenase/metabolism ; Organometallic Compounds/chemistry ; Oxidation-Reduction ; Protons ; Temperature
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Demography of dietary restriction and death in Drosophila (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-09-23
    Description: Dietary restriction (DR) increases life-span in organisms from yeast to mammals, presumably by slowing the accumulation of aging-related damage. Here we show that in Drosophila, DR extends life-span entirely by reducing the short-term risk of death. Two days after the application of DR at any age for the first time, previously fully fed flies are no more likely to die than flies of the same age that have been subjected to long-term DR. DR of mammals may also reduce short-term risk of death, and hence DR instigated at any age could generate a full reversal of mortality.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mair, William -- Goymer, Patrick -- Pletcher, Scott D -- Partridge, Linda -- New York, N.Y. -- Science. 2003 Sep 19;301(5640):1731-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, University College London, Darwin Building, Gower Street, London WC1E 6BT, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14500985" target="_blank"〉PubMed〈/a〉
    Keywords: *Aging ; Animals ; *Caloric Restriction ; Demography ; *Diet ; Drosophila/*physiology ; Female ; *Longevity ; Male ; Mortality ; Reproduction ; Risk ; Temperature ; Time Factors
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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