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  • 1
    Publication Date: 2000-07-15
    Description: The future adequacy of freshwater resources is difficult to assess, owing to a complex and rapidly changing geography of water supply and use. Numerical experiments combining climate model outputs, water budgets, and socioeconomic information along digitized river networks demonstrate that (i) a large proportion of the world's population is currently experiencing water stress and (ii) rising water demands greatly outweigh greenhouse warming in defining the state of global water systems to 2025. Consideration of direct human impacts on global water supply remains a poorly articulated but potentially important facet of the larger global change question.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vorosmarty, C J -- Green, P -- Salisbury, J -- Lammers, R B -- New York, N.Y. -- Science. 2000 Jul 14;289(5477):284-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Water Systems Analysis Group, Complex Systems Research Center, Ocean Processes Analytical Laboratory, Institute for the Study of Earth, Oceans, and Space, Earth Sciences Department, University of New Hampshire, Durham, NH 03824, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10894773" target="_blank"〉PubMed〈/a〉
    Keywords: Agriculture ; *Climate ; Conservation of Natural Resources ; Fresh Water ; Global Health ; Humans ; *Population Growth ; Socioeconomic Factors ; *Water Supply
    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: 2011-08-13
    Description: Animals that cooperate with nonrelatives represent a challenge to inclusive fitness theory, unless cooperative behavior is shown to provide direct fitness benefits. Inheritance of breeding resources could provide such benefits, but this route to cooperation has been little investigated in the social insects. We show that nest inheritance can explain the presence of unrelated helpers in a classic social insect model, the primitively eusocial wasp Polistes dominulus. We found that subordinate helpers produced more direct offspring than lone breeders, some while still subordinate but most after inheriting the dominant position. Thus, while indirect fitness obtained through helping relatives has been the dominant paradigm for understanding eusociality in insects, direct fitness is vital to explain cooperation in P. dominulus.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Leadbeater, Ellouise -- Carruthers, Jonathan M -- Green, Jonathan P -- Rosser, Neil S -- Field, Jeremy -- New York, N.Y. -- Science. 2011 Aug 12;333(6044):874-6. doi: 10.1126/science.1205140.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Life Sciences, University of Sussex, Brighton BN1 9QG, UK. ellouise.leadbeater@ioz.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21836014" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Behavior, Animal ; Biological Evolution ; *Cooperative Behavior ; Female ; *Genetic Fitness ; Male ; Microsatellite Repeats ; *Nesting Behavior ; Reproduction ; *Social Behavior ; Wasps/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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  • 3
    Publication Date: 2010-10-01
    Description: Protecting the world's freshwater resources requires diagnosing threats over a broad range of scales, from global to local. Here we present the first worldwide synthesis to jointly consider human and biodiversity perspectives on water security using a spatial framework that quantifies multiple stressors and accounts for downstream impacts. We find that nearly 80% of the world's population is exposed to high levels of threat to water security. Massive investment in water technology enables rich nations to offset high stressor levels without remedying their underlying causes, whereas less wealthy nations remain vulnerable. A similar lack of precautionary investment jeopardizes biodiversity, with habitats associated with 65% of continental discharge classified as moderately to highly threatened. The cumulative threat framework offers a tool for prioritizing policy and management responses to this crisis, and underscores the necessity of limiting threats at their source instead of through costly remediation of symptoms in order to assure global water security for both humans and freshwater biodiversity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vorosmarty, C J -- McIntyre, P B -- Gessner, M O -- Dudgeon, D -- Prusevich, A -- Green, P -- Glidden, S -- Bunn, S E -- Sullivan, C A -- Liermann, C Reidy -- Davies, P M -- England -- Nature. 2010 Sep 30;467(7315):555-61. doi: 10.1038/nature09440.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Environmental CrossRoads Initiative, City University of New York, The City College of New York, New York, New York 10035, USA. contact@riverthreat.net〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20882010" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biodiversity ; Conservation of Natural Resources/methods/*statistics & numerical data ; Fisheries ; Geography ; *Internationality ; Population Density ; *Rivers ; *Water Supply
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 2014-12-17
    Description: Can a single conversation change minds on divisive social issues, such as same-sex marriage? A randomized placebo-controlled trial assessed whether gay (n = 22) or straight (n = 19) messengers were effective at encouraging voters (n = 972) to support same-sex marriage and whether attitude change persisted and spread to others in voters' social networks. The results, measured by an unrelated panel survey, show that both gay and straight canvassers produced large effects initially, but only gay canvassers' effects persisted in 3-week, 6-week, and 9-month follow-ups. We also find strong evidence of within-household transmission of opinion change, but only in the wake of conversations with gay canvassers. Contact with gay canvassers further caused substantial change in the ratings of gay men and lesbians more generally. These large, persistent, and contagious effects were confirmed by a follow-up experiment. Contact with minorities coupled with discussion of issues pertinent to them is capable of producing a cascade of opinion change.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉LaCour, Michael J -- Green, Donald P -- New York, N.Y. -- Science. 2014 Dec 12;346(6215):1366-9. doi: 10.1126/science.1256151.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Political Science, University of California, Los Angeles (UCLA), Los Angeles, CA, USA. ; Department of Political Science, Columbia University, New York, NY, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25504721" target="_blank"〉PubMed〈/a〉
    Keywords: *Attitude ; Female ; *Homosexuality, Female ; *Homosexuality, Male ; Humans ; *Interpersonal Relations ; Male ; *Marriage ; Prejudice/*psychology ; Public Opinion ; Social Networking
    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
    ISSN: 1615-6102
    Keywords: Cortical microtubules ; Cytoskeleton ; Organ growth ; Immunofluorescence ; Graptopetalum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Cortical microtubules in the epidermis of regeneratingGraptopetalum plants were examined by in situ immunofluorescence. Paradermal slices of tissue were prepared by a method that preserves microtubule arrays and also maintains cell junctions. To test the hypothesis that cortical microtubule arrays align perpendicular to the direction of organ growth, arrays were visualized and their orientation quantified. A majority of microtubules are in transverse orientation with respect to the organ axis early in shoot development when the growth habit is uniform. Later in development, when growth habit is non-uniform and the tissue is contoured, cortical microtubules are increasingly longitudinal and oblique in orientation. Microtubules show only a minor change in orientation at the site of greatest curvature, the transition zone of a developing leaf. To assess the role of the division plane on orientation of arrays, the pattern of microtubules was examined in individual cells of common shape. Cells derived from transverse divisions have predominately transverse cortical arrays, whereas cells derived from oblique and longitudinal divisions have non-transverse arrays. The results show that, regardless of the stage of development, microtubules orient with respect to cell shape and plane of division. The results suggest that cytoskeletal function is best considered in small domains of growth within an organ.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 147 (1988), S. 77-79 
    ISSN: 1615-6102
    Keywords: Cell patterns ; Graptopetalum ; Nondestructive ; Replica ; Scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A two-step replica technique has been developed for sequential study of the epidermal cell pattern of a living plant by scanning electron microscopy. This method is nondestructive, allows periodic high resolution observation of the same developing tissue, and can precede use of any destructive technique, such as transmission electron microscopy. The replicas can be trimmed allowing observation of occluded surfaces, such as the areas between leaves, which are inaccessible in continuousin vivo studies. Here we study the developing leaf primordium ofGraptopetalum and discuss potential uses of the technique.
    Type of Medium: Electronic Resource
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