5,908 research outputs found
An Examination of Conflicting Findings Between Job Satisfaction and Absenteeism: A Meta Analysis
This study, which applied meta-analytic procedures, found a significant negative relationship between certain facets of job satisfaction and absenteeism. Findings suggest that sampling errors, scale inadequacies, and the use of different measures of job satisfaction and absence are the reasons for inconsistencies in previous empirical research that examined the relationship between job satisfaction and absenteeism
Comparative study of CXC chemokines modulation in brown trout (Salmo trutta) following infection with a bacterial or viral pathogen
Acknowledgements We would like to acknowledge Richard Paley, Tom Hill and Georgina Rimmer for their collaboration during brown trout infection challenges in CEFAS-Weymouth biosecurity facilities. Bartolomeo Gorgoglione, Stephen W. Feist and Nick G. H. Taylor were supported by a DEFRA grant (F1198).Peer reviewedPostprin
Recreation of the terminal events in physiological integrin activation.
Increased affinity of integrins for the extracellular matrix (activation) regulates cell adhesion and migration, extracellular matrix assembly, and mechanotransduction. Major uncertainties concern the sufficiency of talin for activation, whether conformational change without clustering leads to activation, and whether mechanical force is required for molecular extension. Here, we reconstructed physiological integrin activation in vitro and used cellular, biochemical, biophysical, and ultrastructural analyses to show that talin binding is sufficient to activate integrin alphaIIbbeta3. Furthermore, we synthesized nanodiscs, each bearing a single lipid-embedded integrin, and used them to show that talin activates unclustered integrins leading to molecular extension in the absence of force or other membrane proteins. Thus, we provide the first proof that talin binding is sufficient to activate and extend membrane-embedded integrin alphaIIbbeta3, thereby resolving numerous controversies and enabling molecular analysis of reconstructed integrin signaling
Effects of instructional set variations on the Bichrome Test and comparison of the continuous and flash phoria techniques
Effects of instructional set variations on the Bichrome Test and comparison of the continuous and flash phoria technique
Personnel/Human Resources Management Issues Between 1927-1981: A Replication
This study represents a historical analysis of personnel/human resource topics/issues of the last 55 years. The contents of 6,412 articles published in two journals are categorized and examined Issues that have either dominated the journals or have been neglected are identified, and the importance and origination of these issues are clarified by placing them in a historical context Methodological issues of this analysis are discusse
The Spindle Assembly Checkpoint
During mitosis and meiosis, the spindle assembly checkpoint acts to maintain genome stability by delaying cell division until accurate chromosome segregation can be guaranteed. Accuracy requires that chromosomes become correctly attached to the microtubule spindle apparatus via their kinetochores. When not correctly attached to the spindle, kinetochores activate the spindle assembly checkpoint network, which in turn blocks cell cycle progression. Once all kinetochores become stably attached to the spindle, the checkpoint is inactivated, which alleviates the cell cycle block and thus allows chromosome segregation and cell division to proceed. Here we review recent progress in our understanding of how the checkpoint signal is generated, how it blocks cell cycle progression and how it is extinguished
The Need For Speed: Rapid Refitting Techniques for Bayesian Spectral Characterization of the Gravitational Wave Background Using PTAs
Current pulsar timing array (PTA) techniques for characterizing the spectrum
of a nanohertz-frequency stochastic gravitational-wave background (SGWB) begin
at the stage of timing data. This can be slow and memory intensive with
computational scaling that will worsen PTA analysis times as more pulsars and
observations are added. Given recent evidence for a common-spectrum process in
PTA data sets and the need to understand present and future PTA capabilities to
characterize the SGWB through large-scale simulations, we have developed
efficient and rapid approaches that operate on intermediate SGWB analysis
products. These methods refit SGWB spectral models to previously-computed
Bayesian posterior estimations of the timing power spectra. We test our new
methods on simulated PTA data sets and the NANOGrav -year data set, where
in the latter our refit posterior achieves a Hellinger distance from the
current full production-level pipeline that is . Our methods are
-- times faster than the production-level likelihood and scale
sub-linearly as a PTA is expanded with new pulsars or observations. Our methods
also demonstrate that SGWB spectral characterization in PTA data sets is driven
by the longest-timed pulsars with the best-measured power spectral densities
which is not necessarily the case for SGWB detection that is predicated on
correlating many pulsars. Indeed, the common-process spectral properties found
in the NANOGrav -year data set are given by analyzing only the
longest-timed pulsars out of the full pulsar array, and we find that the
``shallowing'' of the common-process power-law model occurs when
gravitational-wave frequencies higher than ~nanohertz are included.
The implementation of our methods is openly available as a software suite to
allow fast and flexible PTA SGWB spectral characterization and model selection.Comment: 19 pages, 12 figures. Submitting to Physical Review
Adaptive foveated single-pixel imaging with dynamic super-sampling
As an alternative to conventional multi-pixel cameras, single-pixel cameras
enable images to be recorded using a single detector that measures the
correlations between the scene and a set of patterns. However, to fully sample
a scene in this way requires at least the same number of correlation
measurements as there are pixels in the reconstructed image. Therefore
single-pixel imaging systems typically exhibit low frame-rates. To mitigate
this, a range of compressive sensing techniques have been developed which rely
on a priori knowledge of the scene to reconstruct images from an under-sampled
set of measurements. In this work we take a different approach and adopt a
strategy inspired by the foveated vision systems found in the animal kingdom -
a framework that exploits the spatio-temporal redundancy present in many
dynamic scenes. In our single-pixel imaging system a high-resolution foveal
region follows motion within the scene, but unlike a simple zoom, every frame
delivers new spatial information from across the entire field-of-view. Using
this approach we demonstrate a four-fold reduction in the time taken to record
the detail of rapidly evolving features, whilst simultaneously accumulating
detail of more slowly evolving regions over several consecutive frames. This
tiered super-sampling technique enables the reconstruction of video streams in
which both the resolution and the effective exposure-time spatially vary and
adapt dynamically in response to the evolution of the scene. The methods
described here can complement existing compressive sensing approaches and may
be applied to enhance a variety of computational imagers that rely on
sequential correlation measurements.Comment: 13 pages, 5 figure
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