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  • 1
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    Phase behavior and properties of the liquid-crystal dimer 1′′,7′′-bis(4-cyanobiphenyl-4′-yl) heptane: A twist-bend nematic liquid crystal (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-09-17
    Description: Author(s): M. Cestari, S. Diez-Berart, D. A. Dunmur, A. Ferrarini, M. R. de la Fuente, D. J. B. Jackson, D. O. Lopez, G. R. Luckhurst, M. A. Perez-Jubindo, R. M. Richardson, J. Salud, B. A. Timimi, and H. Zimmermann The liquid-crystal dimer 1′′,7′′-bis(4-cyanobiphenyl-4′-yl)heptane (CB7CB) exhibits two liquid-crystalline mesophases on cooling from the isotropic phase. The high-temperature phase is nematic; the identification and characterization of the other liquid-crystal phase is reported in this paper. It is... [Phys. Rev. E 84, 031704] Published Fri Sep 16, 2011
    Keywords: Liquid crystals
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Historical overfishing and the recent collapse of coastal ecosystems (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-07-28
    Description: Ecological extinction caused by overfishing precedes all other pervasive human disturbance to coastal ecosystems, including pollution, degradation of water quality, and anthropogenic climate change. Historical abundances of large consumer species were fantastically large in comparison with recent observations. Paleoecological, archaeological, and historical data show that time lags of decades to centuries occurred between the onset of overfishing and consequent changes in ecological communities, because unfished species of similar trophic level assumed the ecological roles of overfished species until they too were overfished or died of epidemic diseases related to overcrowding. Retrospective data not only help to clarify underlying causes and rates of ecological change, but they also demonstrate achievable goals for restoration and management of coastal ecosystems that could not even be contemplated based on the limited perspective of recent observations alone.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jackson, J B -- Kirby, M X -- Berger, W H -- Bjorndal, K A -- Botsford, L W -- Bourque, B J -- Bradbury, R H -- Cooke, R -- Erlandson, J -- Estes, J A -- Hughes, T P -- Kidwell, S -- Lange, C B -- Lenihan, H S -- Pandolfi, J M -- Peterson, C H -- Steneck, R S -- Tegner, M J -- Warner, R R -- New York, N.Y. -- Science. 2001 Jul 27;293(5530):629-37.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093-0244, USA. jbcj@ucsd.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11474098" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Archaeology ; Bacteria ; Cnidaria ; Conservation of Natural Resources ; *Ecosystem ; Eutrophication ; *Fishes ; Geologic Sediments ; Humans ; *Marine Biology ; Seaweed ; Shellfish ; Time Factors
    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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    Paleoecology. Measuring past biodiversity (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-09-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jackson, J B -- Johnson, K G -- New York, N.Y. -- Science. 2001 Sep 28;293(5539):2401-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093, USA. jbcj@ucsd.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11577222" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Evolution ; Classification ; Databases, Factual ; *Ecosystem ; *Fossils ; *Invertebrates/classification ; *Marine Biology ; Oceans and Seas ; *Paleontology ; Panama ; Sampling Studies
    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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    Ecological effects of a major oil spill on panamanian coastal marine communities (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-01-06
    Description: In 1986 more than 8 million liters of crude oil spilled into a complex region of mangroves, seagrasses, and coral reefs just east of the Caribbean entrance to the Panama Canal. This was the largest recorded spill into coastal habitats in the tropical Americas. Many population of plants and animals in both oiled and unoiled sites had been studied previously, thereby providing an unprecedented measure of ecological variation before the spill. Documenation of the spread of oil and its biological begun immediately. Intertidal mangroves, algae, and associated invertebrates were covered by oil and died soon after. More surprisingly, there was also extensive mortality of shallow subtidal reef corals and infauna of seagrass beds. After 1.5 years only some organisms in areas exposed to the open sea have recovered.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jackson, J B -- Cubit, J D -- Keller, B D -- Batista, V -- Burns, K -- Caffey, H M -- Caldwell, R L -- Garrity, S D -- Getter, C D -- Gonzalez, C -- Guzman, H M -- Kaufmann, K W -- Knap, A H -- Levings, S C -- Marshall, M J -- Steger, R -- Thompson, R C -- Weil, E -- New York, N.Y. -- Science. 1989 Jan 6;243(4887):37-44.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17780421" target="_blank"〉PubMed〈/a〉
    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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    Evolutionary significance of morphospecies: a test with cheilostome bryozoa (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-05-04
    Description: Much of the controversy concerning the theory of punctuated equilibrium stems from skepticism about the biologic validity of fossil morphospecies, particularly for supposedly simple invertebrate taxa like cheilostome Bryozoa that form the bulk of the fossil record. However, evidence from breeding experiments and protein electrophoresis shows that morphospecific identity of cheilostomes is heritable and that morphospecies are genetically distinct with no indication of morphologically cryptic species. Thus paleontologists can study cheilostome evolution at the species level, and previously demonstrated pattems suggesting punctuated speciation in cheilostomes should be taken at face value.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jackson, J B -- Cheetham, A H -- New York, N.Y. -- Science. 1990 May 4;248(4955):579-83.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17791464" target="_blank"〉PubMed〈/a〉
    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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    Response (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-01-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jackson, J B -- Cheetham, A H -- New York, N.Y. -- Science. 1991 Jan 18;251(4991):319.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17733292" target="_blank"〉PubMed〈/a〉
    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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  • 7
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    Caribbean reef development was independent of coral diversity over 28 million years (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-03-15
    Description: The relationship between natural variations in coral species diversity, reef development, and ecosystem function on coral reefs is poorly understood. Recent coral diversity varies 10-fold among geographic regions, but rates of reef growth are broadly similar, suggesting that diversity is unimportant for reef development. Differences in diversity may reflect regional differences in long-term biotic history in addition to environmental conditions. Using a combination of new and published fossil and stratigraphic data, we compared changes in coral diversity and reef development within the tropical western Atlantic over the past 28 million years. Reef development was unrelated to coral diversity, and the largest reef tracts formed after extinction had reduced diversity by 50%. High diversity is thus not essential for the growth and persistence of coral reefs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Johnson, Kenneth G -- Jackson, Jeremy B C -- Budd, Ann F -- New York, N.Y. -- Science. 2008 Mar 14;319(5869):1521-3. doi: 10.1126/science.1152197.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Palaeontology, Natural History Museum, Cromwell Road, London SW7 5BD, UK. K.Johnson@nhm.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18339937" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Anthozoa/growth & development ; *Biodiversity ; Carbonates/analysis ; Caribbean Region ; *Ecosystem ; *Fossils ; *Geologic Sediments/chemistry ; Temperature ; Time
    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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  • 8
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    Trophic downgrading of planet Earth (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-07-19
    Description: Until recently, large apex consumers were ubiquitous across the globe and had been for millions of years. The loss of these animals may be humankind's most pervasive influence on nature. Although such losses are widely viewed as an ethical and aesthetic problem, recent research reveals extensive cascading effects of their disappearance in marine, terrestrial, and freshwater ecosystems worldwide. This empirical work supports long-standing theory about the role of top-down forcing in ecosystems but also highlights the unanticipated impacts of trophic cascades on processes as diverse as the dynamics of disease, wildfire, carbon sequestration, invasive species, and biogeochemical cycles. These findings emphasize the urgent need for interdisciplinary research to forecast the effects of trophic downgrading on process, function, and resilience in global ecosystems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Estes, James A -- Terborgh, John -- Brashares, Justin S -- Power, Mary E -- Berger, Joel -- Bond, William J -- Carpenter, Stephen R -- Essington, Timothy E -- Holt, Robert D -- Jackson, Jeremy B C -- Marquis, Robert J -- Oksanen, Lauri -- Oksanen, Tarja -- Paine, Robert T -- Pikitch, Ellen K -- Ripple, William J -- Sandin, Stuart A -- Scheffer, Marten -- Schoener, Thomas W -- Shurin, Jonathan B -- Sinclair, Anthony R E -- Soule, Michael E -- Virtanen, Risto -- Wardle, David A -- New York, N.Y. -- Science. 2011 Jul 15;333(6040):301-6. doi: 10.1126/science.1205106.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95060, USA. jestes@ucsc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21764740" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biodiversity ; *Ecosystem ; *Extinction, Biological ; Feeding Behavior ; *Food Chain ; Humans ; Introduced Species ; Population Dynamics ; Predatory Behavior
    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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    Ecology. Are U.S. coral reefs on the slippery slope to slime? (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-03-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pandolfi, J M -- Jackson, J B C -- Baron, N -- Bradbury, R H -- Guzman, H M -- Hughes, T P -- Kappel, C V -- Micheli, F -- Ogden, J C -- Possingham, H P -- Sala, E -- New York, N.Y. -- Science. 2005 Mar 18;307(5716):1725-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for Marine Studies and Department of Earth Sciences, University of Queensland, St. Lucia, QLD 4072, Australia. j.pandolfi@uq.edu.au〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15774744" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Anthozoa ; Biodiversity ; Biomass ; Conservation of Natural Resources ; *Ecosystem ; Eutrophication ; Fishes ; Food Chain ; Greenhouse Effect ; International Cooperation ; Public Policy ; United States ; Water Pollution
    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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  • 10
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    Global trajectories of the long-term decline of coral reef ecosystems (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-08-16
    Description: Degradation of coral reef ecosystems began centuries ago, but there is no global summary of the magnitude of change. We compiled records, extending back thousands of years, of the status and trends of seven major guilds of carnivores, herbivores, and architectural species from 14 regions. Large animals declined before small animals and architectural species, and Atlantic reefs declined before reefs in the Red Sea and Australia, but the trajectories of decline were markedly similar worldwide. All reefs were substantially degraded long before outbreaks of coral disease and bleaching. Regardless of these new threats, reefs will not survive without immediate protection from human exploitation over large spatial scales.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pandolfi, John M -- Bradbury, Roger H -- Sala, Enric -- Hughes, Terence P -- Bjorndal, Karen A -- Cooke, Richard G -- McArdle, Deborah -- McClenachan, Loren -- Newman, Marah J H -- Paredes, Gustavo -- Warner, Robert R -- Jackson, Jeremy B C -- New York, N.Y. -- Science. 2003 Aug 15;301(5635):955-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Paleobiology, MRC-121, National Museum of Natural History, Post Office Box 37012, Smithsonian Institution, Washington, DC 20013-7012, USA. pandolfi.john@nmnh.si.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12920296" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Anthozoa/*growth & development ; Conservation of Natural Resources ; Culture ; *Ecosystem ; Humans ; Population Dynamics ; Principal Component Analysis ; Time Factors
    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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