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排序方式: 共有10000条查询结果,搜索用时 29 毫秒
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Mohammed Mamdani Vernell Williamson Gowon O. McMichael Tana Blevins Fazil Aliev Amy Adkins Laura Hack Tim Bigdeli Andrew D. van der Vaart Bradley Todd Web Silviu-Alin Bacanu Gursharan Kalsi COGA Consortium Kenneth S. Kendler Michael F. Miles Danielle Dick Brien P. Riley Catherine Dumur Vladimir I. Vladimirov 《PloS one》2015,10(9)
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Jeannette Sutton C. Ben Gibson Emma S. Spiro Cedar League Sean M. Fitzhugh Carter T. Butts 《PloS one》2015,10(8)
Message retransmission is a central aspect of information diffusion. In a disaster context, the passing on of official warning messages by members of the public also serves as a behavioral indicator of message salience, suggesting that particular messages are (or are not) perceived by the public to be both noteworthy and valuable enough to share with others. This study provides the first examination of terse message retransmission of official warning messages in response to a domestic terrorist attack, the Boston Marathon Bombing in 2013. Using messages posted from public officials’ Twitter accounts that were active during the period of the Boston Marathon bombing and manhunt, we examine the features of messages that are associated with their retransmission. We focus on message content, style, and structure, as well as the networked relationships of message senders to answer the question: what characteristics of a terse message sent under conditions of imminent threat predict its retransmission among members of the public? We employ a negative binomial model to examine how message characteristics affect message retransmission. We find that, rather than any single effect dominating the process, retransmission of official Tweets during the Boston bombing response was jointly influenced by various message content, style, and sender characteristics. These findings suggest the need for more work that investigates impact of multiple factors on the allocation of attention and on message retransmission during hazard events. 相似文献
5.
Characterisation of Pseudomonas rhamnolipids 总被引:5,自引:0,他引:5
N B Rendell G W Taylor M Somerville H Todd R Wilson P J Cole 《Biochimica et biophysica acta》1990,1045(2):189-193
The Gram negative organism, Pseudomonas aeruginosa, is often found in the lungs of patients with cystic fibrosis and other forms of severe bronchiectasis, where it secretes a number of extracellular toxins including the mono- and dirhamnolipids. The principal monorhamnolipid from P. aeruginosa has previously been identified as rhamnosyl-3-hydroxydecanoyl-3-hydroxydecanoate (Rh-C10.C10). A number of related mono- and dirhamnolipids have been purified from cultures of a clinical isolate of P. aeruginosa and identified by fast atom bombardment and electron impact mass spectrometry: these contain the 3-hydroxyoctanoyl-3-hydroxydecanoate (C8.C10) and 3-hydroxydecanoyl-3-hydroxydodecanoate (C10.C12) homologues. Structural isomers were also present where the order of the lipid linkage was transposed (Rh-C10.C8 and Rh-C12.C10). Unsaturated mono- and dirhamnolipids containing the 3-hydroxydecanoyl-3-hydroxydodec-5-enoate (C10.C12:1) lipid were also present. 相似文献
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Andrew B. Stein Todd K. Fuller Laurie L. Marker 《Biodiversity and Conservation》2008,17(14):3579-3587
In northcentral Namibia, Waterberg Plateau Park (WPP) is a protected area that acts as a refuge for rare and endangered species,
while the farmlands surrounding the Park are managed for livestock production, but support populations of wildlife for game
farming, trophy hunting, and conservation. During June–October 2006, camera-traps were set within and surrounding WPP to assess
leopard (Panthera pardus) density (n = 19 camera stations and 946 camera-trap-nights). Fortuitously, photographic results (2,265 photos of identifiable mammal
(n = 37) and bird (n = 25) species) allowed us to assess aspects of species diversity and differences among the Park, the farmland areas along
the Waterberg Plateau escarpment, and the flatlands surrounding the escarpment. Species composition among the three areas
was markedly different, and made sense with respect to differences in habitat and management features. Camera-trapping efforts,
although intended for a narrow purpose, may also provide a rather robust record of differences in mammal and bird diversity
in adjacent habitats and can be incorporated into long-term monitoring programs. 相似文献
8.
Daneen Schaeffer Filipa Pereira Reis Sean J. Johnson Cec��lia Maria Arraiano Ambro van Hoof 《Nucleic acids research》2012,40(18):9298-9307
The 10-subunit RNA exosome is involved in a large number of diverse RNA processing and degradation events in eukaryotes. These reactions are carried out by the single catalytic subunit, Rrp44p/Dis3p, which is composed of three parts that are conserved throughout eukaryotes. The exosome is named for the 3′ to 5′ exoribonuclease activity provided by a large C-terminal region of the Rrp44p subunit that resembles other exoribonucleases. Rrp44p also contains an endoribonuclease domain. Finally, the very N-terminus of Rrp44p contains three Cys residues (CR3 motif) that are conserved in many eukaryotes but have no known function. These three conserved Cys residues cluster with a previously unrecognized conserved His residue in what resembles a metal-ion-binding site. Genetic and biochemical data show that this CR3 motif affects both endo- and exonuclease activity in vivo and both the nuclear and cytoplasmic exosome, as well as the ability of Rrp44p to associate with the other exosome subunits. These data provide the first direct evidence that the exosome-Rrp44p interaction is functionally important and also provides a molecular explanation for the functional defects when the conserved Cys residues are mutated. 相似文献
9.
Richard J. Mills Sean J. Humphrey Patrick R.J. Fortuna Mary Lor Simon R. Foster Gregory A. Quaife-Ryan Rebecca L. Johnston Troy Dumenil Cameron Bishop Rajeev Rudraraju Daniel J. Rawle Thuy Le Wei Zhao Leo Lee Charley Mackenzie-Kludas Neda R. Mehdiabadi Christopher Halliday Dean Gilham James E. Hudson 《Cell》2021,184(8):2167-2182.e22