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  • American Association for the Advancement of Science  (337)
  • American Association for the Advancement of Science (AAAS)
  • 1
    Publication Date: 2018
    Description: 〈p〉Dynamic networks, where ties can be shed and new ties can be formed, promote the evolution of cooperation. Yet, past research has only compared networks where all ties can be severed to those where none can, confounding the benefits of fully dynamic networks with the presence of some dynamic ties within the network. Further, humans do not live in fully dynamic networks. Instead, in real-world networks, some ties are subject to change, while others are difficult to sever. Here, we consider whether and how cooperation evolves in networks containing both static and dynamic ties. We argue and find that the presence of dynamic ties in networks promotes cooperation even in static ties. Consistent with previous work demonstrating that cooperation cascades in networks, our results show that cooperation is enhanced in networks with both tie types because the higher rate of cooperation that occurs following the dynamics process "spills over" to those relations that are more difficult to alter. Thus, our findings demonstrate the critical role that dynamic ties play in promoting cooperation by altering behavioral outcomes even in non-dynamic relations.〈/p〉
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
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  • 2
    Publication Date: 1999-04-24
    Description: The lack of an adequate hominid fossil record in eastern Africa between 2 and 3 million years ago (Ma) has hampered investigations of early hominid phylogeny. Discovery of 2.5 Ma hominid cranial and dental remains from the Hata beds of Ethiopia's Middle Awash allows recognition of a new species of Australopithecus. This species is descended from Australopithecus afarensis and is a candidate ancestor for early Homo. Contemporary postcranial remains feature a derived humanlike humeral/femoral ratio and an apelike upper arm-to-lower arm ratio.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Asfaw, B -- White, T -- Lovejoy, O -- Latimer, B -- Simpson, S -- Suwa, G -- New York, N.Y. -- Science. 1999 Apr 23;284(5414):629-35.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Rift Valley Research Service, Post Office Box 5717, Addis Ababa, Ethiopia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10213683" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Evolution ; Bones of Upper Extremity/anatomy & histology ; Dentition ; Ethiopia ; *Fossils ; History, Ancient ; Hominidae/anatomy & histology/*classification ; Humans ; Leg Bones/anatomy & histology ; Paleodontology ; Phylogeny ; Skull/anatomy & histology ; Terminology as Topic ; Tooth/anatomy & histology
    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: 2000-08-12
    Description: Ecosystems are capital assets: When properly managed, they yield a flow of vital goods and services. Relative to other forms of capital, however, ecosystems are poorly understood, scarcely monitored, and--in many important cases--undergoing rapid degradation. The process of economic valuation could greatly improve stewardship. This potential is now being realized with innovative financial instruments and institutional arrangements.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Daily, G C -- Soderqvist, T -- Aniyar, S -- Arrow, K -- Dasgupta, P -- Ehrlich, P R -- Folke, C -- Jansson, A -- Jansson, B -- Kautsky, N -- Levin, S -- Lubchenco, J -- Maler, K G -- Simpson, D -- Starrett, D -- Tilman, D -- Walker, B -- New York, N.Y. -- Science. 2000 Jul 21;289(5478):395-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, Stanford University, Stanford, CA 94305, USA. gdaily@leland.stanford.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10939949" target="_blank"〉PubMed〈/a〉
    Keywords: Australia ; Commerce ; Conservation of Natural Resources/*economics ; Costa Rica ; *Ecosystem ; Industry ; Investments
    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
    Publication Date: 2000-03-25
    Description: The fly Drosophila melanogaster is one of the most intensively studied organisms in biology and serves as a model system for the investigation of many developmental and cellular processes common to higher eukaryotes, including humans. We have determined the nucleotide sequence of nearly all of the approximately 120-megabase euchromatic portion of the Drosophila genome using a whole-genome shotgun sequencing strategy supported by extensive clone-based sequence and a high-quality bacterial artificial chromosome physical map. Efforts are under way to close the remaining gaps; however, the sequence is of sufficient accuracy and contiguity to be declared substantially complete and to support an initial analysis of genome structure and preliminary gene annotation and interpretation. The genome encodes approximately 13,600 genes, somewhat fewer than the smaller Caenorhabditis elegans genome, but with comparable functional diversity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Adams, M D -- Celniker, S E -- Holt, R A -- Evans, C A -- Gocayne, J D -- Amanatides, P G -- Scherer, S E -- Li, P W -- Hoskins, R A -- Galle, R F -- George, R A -- Lewis, S E -- Richards, S -- Ashburner, M -- Henderson, S N -- Sutton, G G -- Wortman, J R -- Yandell, M D -- Zhang, Q -- Chen, L X -- Brandon, R C -- Rogers, Y H -- Blazej, R G -- Champe, M -- Pfeiffer, B D -- Wan, K H -- Doyle, C -- Baxter, E G -- Helt, G -- Nelson, C R -- Gabor, G L -- Abril, J F -- Agbayani, A -- An, H J -- Andrews-Pfannkoch, C -- Baldwin, D -- Ballew, R M -- Basu, A -- Baxendale, J -- Bayraktaroglu, L -- Beasley, E M -- Beeson, K Y -- Benos, P V -- Berman, B P -- Bhandari, D -- Bolshakov, S -- Borkova, D -- Botchan, M R -- Bouck, J -- Brokstein, P -- Brottier, P -- Burtis, K C -- Busam, D A -- Butler, H -- Cadieu, E -- Center, A -- Chandra, I -- Cherry, J M -- Cawley, S -- Dahlke, C -- Davenport, L B -- Davies, P -- de Pablos, B -- Delcher, A -- Deng, Z -- Mays, A D -- Dew, I -- Dietz, S M -- Dodson, K -- Doup, L E -- Downes, M -- Dugan-Rocha, S -- Dunkov, B C -- Dunn, P -- Durbin, K J -- Evangelista, C C -- Ferraz, C -- Ferriera, S -- Fleischmann, W -- Fosler, C -- Gabrielian, A E -- Garg, N S -- Gelbart, W M -- Glasser, K -- Glodek, A -- Gong, F -- Gorrell, J H -- Gu, Z -- Guan, P -- Harris, M -- Harris, N L -- Harvey, D -- Heiman, T J -- Hernandez, J R -- Houck, J -- Hostin, D -- Houston, K A -- Howland, T J -- Wei, M H -- Ibegwam, C -- Jalali, M -- Kalush, F -- Karpen, G H -- Ke, Z -- Kennison, J A -- Ketchum, K A -- Kimmel, B E -- Kodira, C D -- Kraft, C -- Kravitz, S -- Kulp, D -- Lai, Z -- Lasko, P -- Lei, Y -- Levitsky, A A -- Li, J -- Li, Z -- Liang, Y -- Lin, X -- Liu, X -- Mattei, B -- McIntosh, T C -- McLeod, M P -- McPherson, D -- Merkulov, G -- Milshina, N V -- Mobarry, C -- Morris, J -- Moshrefi, A -- Mount, S M -- Moy, M -- Murphy, B -- Murphy, L -- Muzny, D M -- Nelson, D L -- Nelson, D R -- Nelson, K A -- Nixon, K -- Nusskern, D R -- Pacleb, J M -- Palazzolo, M -- Pittman, G S -- Pan, S -- Pollard, J -- Puri, V -- Reese, M G -- Reinert, K -- Remington, K -- Saunders, R D -- Scheeler, F -- Shen, H -- Shue, B C -- Siden-Kiamos, I -- Simpson, M -- Skupski, M P -- Smith, T -- Spier, E -- Spradling, A C -- Stapleton, M -- Strong, R -- Sun, E -- Svirskas, R -- Tector, C -- Turner, R -- Venter, E -- Wang, A H -- Wang, X -- Wang, Z Y -- Wassarman, D A -- Weinstock, G M -- Weissenbach, J -- Williams, S M -- WoodageT -- Worley, K C -- Wu, D -- Yang, S -- Yao, Q A -- Ye, J -- Yeh, R F -- Zaveri, J S -- Zhan, M -- Zhang, G -- Zhao, Q -- Zheng, L -- Zheng, X H -- Zhong, F N -- Zhong, W -- Zhou, X -- Zhu, S -- Zhu, X -- Smith, H O -- Gibbs, R A -- Myers, E W -- Rubin, G M -- Venter, J C -- P50-HG00750/HG/NHGRI NIH HHS/ -- U54 HG003273/HG/NHGRI NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2000 Mar 24;287(5461):2185-95.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Celera Genomics, 45 West Gude Drive, Rockville, MD 20850, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10731132" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Transport/genetics ; Chromatin/genetics ; Cloning, Molecular ; Computational Biology ; Contig Mapping ; Cytochrome P-450 Enzyme System/genetics ; DNA Repair/genetics ; DNA Replication/genetics ; Drosophila melanogaster/*genetics/metabolism ; Euchromatin ; Gene Library ; Genes, Insect ; *Genome ; Heterochromatin/genetics ; Insect Proteins/chemistry/genetics/physiology ; Nuclear Proteins/genetics ; Protein Biosynthesis ; *Sequence Analysis, DNA ; Transcription, Genetic
    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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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-09-11
    Description: The Hayward fault, located on the east side of the San Francisco Bay, represents a natural laboratory for seismologists, because it does not sleep silently between major earthquakes. In his Perspective, Simpson discusses the study by Burgmann et al., who have used powerful new techniques to study the fault. The results indicate that major earthquakes cannot originate in the northern part of the fault. However, surface-rupturing earthquakes have occurred in the area, suggesting that they originated to the north or south of the segment studied by Burgmann et al. Fundamental questions remain regarding the mechanism by which plate tectonic stresses are transferred to the Hayward fault.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Simpson, R W -- New York, N.Y. -- Science. 2000 Aug 18;289(5482):1147-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17833401" 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
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  • 6
    Publication Date: 2001-04-28
    Description: Slit is secreted by cells at the midline of the central nervous system, where it binds to Roundabout (Robo) receptors and functions as a potent repellent. We found that migrating mesodermal cells in vivo respond to Slit as both an attractant and a repellent and that Robo receptors are required for both functions. Mesoderm cells expressing Robo receptors initially migrate away from Slit at the midline. A few hours after migration, these same cells change their behavior and require Robo to extend toward Slit-expressing muscle attachment sites. Thus, Slit functions as a chemoattractant to provide specificity for muscle patterning.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kramer, S G -- Kidd, T -- Simpson, J H -- Goodman, C S -- NS18366/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2001 Apr 27;292(5517):737-40.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Molecular and Cell Biology, 519 Life Sciences Addition, University of California, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11326102" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Body Patterning ; Cell Fusion ; Cell Movement ; Drosophila/embryology/genetics ; *Drosophila Proteins ; Embryo, Nonmammalian/cytology/metabolism ; Epidermis/embryology/metabolism ; Mesoderm/*cytology/metabolism ; Microscopy, Confocal ; Muscles/*cytology/embryology/metabolism ; Mutation ; Nerve Tissue Proteins/genetics/*metabolism ; Receptors, Immunologic/genetics/*metabolism ; Signal Transduction ; Stem Cells/metabolism/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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  • 7
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-07-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Simpson, S -- Marshall, E -- New York, N.Y. -- Science. 2001 Jul 13;293(5528):233.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11452107" target="_blank"〉PubMed〈/a〉
    Keywords: Allergy and Immunology/trends ; Humans ; *Immunity ; Immunization Programs ; *Immunologic Memory ; *Vaccines/administration & dosage/immunology
    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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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2002-04-16
    Description: Multiple environmental and endogenous inputs regulate when plants flower. The molecular genetic dissection of flowering time control in Arabidopsis has identified an integrated network of pathways that quantitatively control the timing of this developmental switch. This framework provides the basis to understand the evolution of different reproductive strategies and how floral pathways interact through seasonal progression.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Simpson, Gordon G -- Dean, Caroline -- New York, N.Y. -- Science. 2002 Apr 12;296(5566):285-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell and Developmental Biology, John Innes Centre, Norwich, NR4 7UH, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11951029" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis/genetics/growth & development/*physiology ; Arabidopsis Proteins/genetics/*metabolism ; Circadian Rhythm ; DNA-Binding Proteins/genetics/physiology ; *Gene Expression Regulation, Plant ; Genes, Plant ; Gibberellins/metabolism ; Meristem/physiology ; Mutation ; Photoperiod ; Plant Structures/physiology ; Seasons ; Temperature ; Time Factors ; Transcription Factors/genetics/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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  • 9
    Publication Date: 2002-09-21
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chapin, Douglas M -- Cohen, Karl P -- Davis, W Kenneth -- Kintner, Edwin E -- Koch, Leonard J -- Landis, John W -- Levenson, Milton -- Mandil, I Harry -- Pate, Zack T -- Rockwell, Theodore -- Schriesheim, Alan -- Simpson, John W -- Squire, Alexander -- Starr, Chauncey -- Stone, Henry E -- Taylor, John J -- Todreas, Neil E -- Wolfe, Bertram -- Zebroski, Edwin L -- New York, N.Y. -- Science. 2002 Sep 20;297(5589):1997-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉MPR Associates, Inc., Alexandria, VA 22314-3230, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12242425" target="_blank"〉PubMed〈/a〉
    Keywords: *Nuclear Energy ; *Nuclear Reactors ; *Power Plants ; Radioactive Hazard Release ; *Safety ; *Terrorism ; Ukraine ; United States
    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
    Publication Date: 1999-10-26
    Description: The discovery of a Middle to Late Triassic ( approximately 225 to 230 million years old) terrestrial vertebrate fauna from Madagascar is reported. This fauna documents a temporal interval not well represented by continental vertebrate assemblages elsewhere in the world. It contains two new prosauropod dinosaurs, representing some of the earliest dinosaur occurrences known globally. This assemblage provides information about the poorly understood transition to the dinosaur-dominated faunas of the latest Triassic.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Flynn -- Parrish -- Rakotosamimanana -- Simpson -- Whatley -- Wyss -- New York, N.Y. -- Science. 1999 Oct 22;286(5440):763-765.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geology, The Field Museum, Chicago, IL 60605, USA. Department of Biological Sciences, Northern Illinois University, DeKalb, IL 60115, USA. Departement de Paleontologie et d'Anthropologie Biologique, Universite d'Antananarivo, Antananarivo 101, Madagascar. Department of Geology, University of California, Santa Barbara, CA 93106, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10531059" 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
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