Showing 971 - 980 of 2040 Items
The Role of Social Media for Knowledge Sharing and Collaboration in Distributed Teams
Creator: Nicole Ellison
Matthew Weber
Access: Open access
- Social media are providing a medium through which individuals are reshaping how they do many things – finding romantic partners, providing social support, grieving for loved ones, even buying mundane items like toothpaste. They are also reshaping organizations – the way they function, the relationships they contain, and the ways organizations interact with external stakeholders. In this paper, we consider the changes that social media have introduced to organizational knowledge-sharing practices. We believe the social and technical affordances of social media create new challenges for organizations and necessitate research examining the ways in which: (1) technological affordances impact knowledge sharing within and between teams, (2) interpersonal and relationship development processes shape knowledge sharing among distributed team members and their individual social networks, and (3) organizational social networks influence knowledge sharing among distributed team members.
A nuclear narrative: Robert Oppenheimer, autobiography, and public authority
Date: 2010-12-01
Creator: David K. Hecht
Access: Open access
Preparing for and managing change: Climate adaptation for biodiversity and ecosystems
Date: 2013-11-01
Creator: Bruce A. Stein
Amanda Staudt
Molly S. Cross
Natalie S. Dubois
Carolyn, Enquist
Roger Griffis
Lara J. Hansen
Jessica J. Hellmann
Joshua J. Lawler
Access: Open access
- The emerging field of climate-change adaptation has experienced a dramatic increase in attention as the impacts of climate change on biodiversity and ecosystems have become more evident. Preparing for and addressing these changes are now prominent themes in conservation and natural resource policy and practice. Adaptation increasingly is viewed as a way of managing change, rather than just maintaining existing conditions. There is also increasing recognition of the need not only to adjust management strategies in light of climate shifts, but to reassess and, as needed, modify underlying conservation goals. Major advances in the development of climate-adaptation principles, strategies, and planning processes have occurred over the past few years, although implementation of adaptation plans continues to lag. With ecosystems expected to undergo continuing climate-mediated changes for years to come, adaptation can best be thought of as an ongoing process, rather than as a fixed endpoint. © The Ecological Society of America.
The (Far) Backstory of the U.S.-Colombia Free Trade Agreement
Date: 2013-10-10
Creator: Stephen Meardon
Access: Open access
- In two pairs of episodes, first in 1824 and 1846 and then in 1892 and 1935, similar U.S.-Colombia trade agreements or their enabling laws were embraced first by protectionists and then by free traders. The history of the episodes supports the view that although political institutions exist to curb de facto political power, such power may be wielded to undo the institutions’ intended effects. The doctrinal affinities and interests of political actors are more decisive determinants of the free-trade or protectionist orientation of trade agreements than the agreements’ texts or legal superstructures. The long delay from signing to passage of the current U.S.-Colombia Free Trade Agreement is another case in point.
Formation of oral and pharyngeal dentition in teleosts depends on differential recruitment of retinoic acid signaling
Date: 2010-09-01
Creator: Yann Gibert
Laure Bernard
Melanie Debiais-Thibaud
Franck Bourrat
Jean Stephane, Joly
Karen Pottin
Axel Meyer
Sylvie Retaux
David W. Stock
William R. Jackman
Pawat Seritrakul
Gerrit Begemann
Vincent Laudet
Access: Open access
- One of the goals of evolutionary developmental biology is to link specific adaptations to changes in developmental pathways. The dentition of cypriniform fishes, which in contrast to many other teleost fish species possess pharyngeal teeth but lack oral teeth, provides a suitable model to study the development of feeding adaptations. Here, we have examined the involvement of retinoic acid (RA) in tooth development and show that RA is specifically required to induce the pharyngeal tooth developmental program in zebrafish. Perturbation of RA signaling at this stage abolished tooth induction without affecting the development of tooth-associated ceratobranchial bones. We show that this inductive event is dependent on RA synthesis from aldh1a2 in the ventral posterior pharynx. Fibroblast growth factor (FGF) signaling has been shown to be critical for tooth induction in zebrafish, and its loss has been associated with oral tooth loss in cypriniform fishes. Pharmacological treatments targeting the RA and FGF pathways revealed that both pathways act independently during tooth induction. In contrast, we find that in Mexican tetra and medaka, species that also possess oral teeth, both oral and pharyngeal teeth are induced independently of RA. Our analyses suggest an evolutionary scenario in which the gene network controlling tooth development obtained RA dependency in the lineage leading to the cypriniforms. The loss of pharyngeal teeth in this group was cancelled out through a shift in aldh1a2 expression, while oral teeth might have been lost ultimately due to deficient RA signaling in the oral cavity. © FASEB.
Oakeshott, Berlin, and liberalism
Date: 2003-01-01
Creator: Paul Franco
Access: Open access
- This article compares the political philosophies of Michael Oakeshott and Isaiah Berlin, probably the two most important political philosophers in postwar Britain, who, strangely, had very little to do with one another during their illustrious careers. The article focuses on their respective critiques of rationalism and theories of liberal pluralism, arguing that Oakeshott provides the more consistent and philosophically satisfying account in both instances.
Modelling ecosystem services in terrestrial systems
Date: 2010-07-22
Creator: Erik J. Nelson
Gretchen C. Daily
Access: Open access
- Over the past few decades, a multi-disciplinary research community has documented the goods and services provided by ecosystems in specific sites scattered across the world. This research community has now begun to focus on creating methods and tools for mapping and valuing the ecosystem services produced on any landscape in the world. We describe some of these methods and tools and how they calculate and express ecosystem service provision and value on landscapes. We also describe methods for predicting landscape change. These predictions can be used by multi-ecosystem service models to assess potential changes and trade-offs in ecosystem service provision and values into the future. © 2010 Faculty of 1000 Ltd.
Who benefits? How interest-convergence shapes benefit-sharing and indigenous rights to sustainable livelihoods in Russia
Date: 2020-11-01
Creator: Maria S. Tysiachniouk
Laura A. Henry
Svetlana A. Tulaeva
Leah S. Horowitz
Access: Open access
- The paper examines interactions of oil companies and reindeer herders in the tundra of the Russian Arctic. We focus on governance arrangements that have an impact on the sustainability of oil production and reindeer herding. We analyze a shift in benefit-sharing arrangements between oil companies and Indigenous Nenets reindeer herders in Nenets Autonomous Okrug (NAO), Russia, as an evolution of the herders’ rights, defined as the intertwined co-production of legal processes, ideologies, and power relations. Semi-structured interviews, participant observation, and document analysis demonstrate that in NAO, benefit-sharing shifted from paternalism (dependent on herders’ negotiation skills) to company-centered social responsibility (formalized compensation rules). This shift was enabled by the adoption of a formal methodology for calculating income lost due to extractive projects and facilitated by the regional government’s efforts to develop reindeer-herding. While laws per se did not change, herders’ ability to access compensation and markets increased. This paper shows that even when ideologies of indigeneity are not influential, the use of existing laws and convergence of the government’s and Indigenous groups’ economic interests may shift legal processes and power relations toward greater rights for Indigenous groups.
Levels of DNA polymorphism vary with mating system in the nematode genus Caenorhabditis
Date: 2002-01-01
Creator: Andrew Graustein
John M. Caspar
James R. Walters
Michael F. Palopoli
Access: Open access
- Self-fertilizing species often harbor less genetic variation than cross-fertilizing species, and at least four different models have been proposed to explain this trend. To investigate further the relationship between mating system and genetic variation, levels of DNA sequence polymorphism were compared among three closely related species in the genus Caenorhabditis: two self-fertilizing species, Caenorhabditis elegans and C. briggsae, and one cross-fertilizing species, C. remanei. As expected, estimates of silent site nucleotide diversity were lower in the two self-fertilizing species. For the mitochondrial genome, diversity in the selfing species averaged 42% of diversity in C. remanei. Interestingly, the reduction in genetic variation was much greater for the nuclear than for the mitochondrial genome. For two nuclear genes, diversity in the selfing species averaged 6 and 13% of diversity in C. remanei. We argue that either population bottlenecks or the repeated action of natural selection, coupled with high levels of selfing, are likely to explain the observed reductions in species-wide genetic diversity.
Exuberant and inhibited toddlers: Stability of temperament and risk for problem behavior
Date: 2008-03-01
Creator: Cynthia A. Stifter
Samuel Putnam
Laudan Jahromi
Access: Open access
- Temperament, effortful control, and problem behaviors at 4.5 years were assessed in 72 children classified as exuberant, inhibited, and low reactive as 2-year-olds. Exuberant toddlers were more positive, socially responsive to novel persons, less shy, and rated as having more problem behaviors, including externalizing and internalizing behaviors, than other children as preschoolers. Two forms of effortful control, the ability to delay a response and the ability to produce a subdominant response, were associated with fewer externalizing behaviors, whereas expressing more negative affect (relative to positive/neutral affect) when disappointed was related to more internalizing behaviors. Interaction effects implicated high levels of unregulated emotion during disappointment as a risk factor for problem behaviors in exuberant children. © 2008 Cambridge University Press.