13,666 research outputs found

    Star formation in Seyfert galaxies

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    An analysis of the IRAS data for a sample of classical (optically selected) Seyfert galaxies is presented. The IRAS fluxes at 25 micron, 60 micron, and 100 micron are found to be uncorrelated or only very weakly correlated with the UV/Optical continuum flux and the near and mid IR flux at 3.5 and 10 microns. To investigate the possibility that star formation accounts for the far IR flux, the IRAS measurements for the Seyfert galaxies are compared to IRAS observations of a sample of normal spiral galaxies, and a sample of Starburst galaxies. It is shown that the far IR luminosities and far IR colors of Seyfert galaxies are indistinguishable from those of the Starburst galaxies. Besides, normal galaxies are an order of magnitude less luminous than both the Seyfert and the Starburst galaxies. This indicates that star formation produces the bulk of the far infrared emission in Seyfert galaxies

    Suppression of displacement in severely slowed saccades

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    Severely slowed saccades in <I>spinocerebellar ataxia</I> have previously been shown to be at least partially closed-loop in nature: their long duration means that they can be modified in-flight in response to intrasaccadic target movements. In this study, a woman with these pathologically slowed saccades could modify them in-flight in response to target movements, even when saccadic suppression of displacement prevented conscious awareness of those movements. Thus saccadic suppression of displacement is not complete, in that it provides perceptual information that is sub-threshold to consciousness but which can still be effectively utilised by the oculomotor system

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    Continued Continuations of Complete Histories: Tobias Smollett and the Work of History

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    Tobias Smollett wrote one of the bestā€selling historical works of the eighteenth century: the Complete History of England and Continuation. By exploring the idea of ā€˜continuationā€™ ā€“ both as a form of publication and as a narrative technique ā€“ this article seeks to recover the work in which Smollett was engaged. To do so, it considers connections with David Hume's History of England. It suggests that, unlike Hume, Smollett attempted to sustain a media event ā€“ one that was supported by his work as both critic and translator. It is this that should be understood as Smollett's work of history

    Twenty years of airline deregulation: the impact on outlying small communities

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    Many rural communities over the years have had to endure reduced levels of scheduled transportation services to the point that some have indeed experienced a cessation of services. Accompanying the deregulation of airlines in 1978 was the expressed fear that transportation services would continue to spiral downward and various communities would lose their population bases. This study investigates the two decades of airline deregulation and the impact that that 1978 legislation has had on small communities that are situated 100 air miles or more from any hub airport. Chief among the findings are: (1) that service levels have indeed deteriorated as indicated by the fact that over one-quarter of the non hubs lost all service, (2) of those locations that retained some service, nearly two-thirds experienced reduced levels of service, and (3) the overall pattern of population growth remained approximately the same whether service was eliminated, reduced, or increased

    Isolation and characterization of microsatellites in the lichen Buellia frigida (Physciaceae), an Antarctic endemic

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    Premise of the study: Microsatellite markers were characterized for an Antarctic endemic, Buellia frigida, to investigate population structure and origin of Antarctic lichens. Methods and Results: Five primer sets were characterized. All loci were polymorphic with eight to 16 alleles per locus in a sample of 59 lichens. Conclusions: The microsatellite markers potentially provide insight into population structure and gene flow of B. frigida
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