Speeding Up Microevolution: The Effects of Increasing Temperature on Selection and Genetic Variance in a Wild Bird Population

The authors show that environmental variation may lead to a positive association between the annual strength of selection and expression of genetic variance in a wild bird population, which can speed up microevolution and have important consequences for how fast natural populations adapt to environmental changes

Fermi Large Area Telescope Constraints on the Gamma-ray Opacity of the Universe

The Extragalactic Background Light (EBL) includes photons with wavelengths from ultraviolet to infrared, which are effective at attenuating gamma rays with energy above ~10 GeV during propagation from sources at cosmological distances. This results in a redshift- and energy-dependent attenuation of the gamma-ray flux of extragalactic sources such as blazars and Gamma-Ray Bursts (GRBs). The Large Area Telescope onboard Fermi detects a sample of gamma-ray blazars with redshift up to z~3, and GRBs with redshift up to z~4.3. Using photons above 10 GeV collected by Fermi over more than one year of observations for these sources, we investigate the effect of gamma-ray flux attenuation by the EBL. We place upper limits on the gamma-ray opacity of the Universe at various energies and redshifts, and compare this with predictions from well-known EBL models. We find that an EBL intensity in the optical-ultraviolet wavelengths as great as predicted by the "baseline" model of Stecker et al. (2006) can be ruled out with high confidence.Comment: 42 pages, 12 figures, accepted version (24 Aug.2010) for publication in ApJ; Contact authors: A. Bouvier, A. Chen, S. Raino, S. Razzaque, A. Reimer, L.C. Reye

Adaptive Value of Phenological Traits in Stressful Environments: Predictions Based on Seed Production and Laboratory Natural Selection

Phenological traits often show variation within and among natural populations of annual plants. Nevertheless, the adaptive value of post-anthesis traits is seldom tested. In this study, we estimated the adaptive values of pre- and post-anthesis traits in two stressful environments (water stress and interspecific competition), using the selfing annual species Arabidopsis thaliana. By estimating seed production and by performing laboratory natural selection (LNS), we assessed the strength and nature (directional, disruptive and stabilizing) of selection acting on phenological traits in A. thaliana under the two tested stress conditions, each with four intensities. Both the type of stress and its intensity affected the strength and nature of selection, as did genetic constraints among phenological traits. Under water stress, both experimental approaches demonstrated directional selection for a shorter life cycle, although bolting time imposes a genetic constraint on the length of the interval between bolting and anthesis. Under interspecific competition, results from the two experimental approaches showed discrepancies. Estimation of seed production predicted directional selection toward early pre-anthesis traits and long post-anthesis periods. In contrast, the LNS approach suggested neutrality for all phenological traits. This study opens questions on adaptation in complex natural environment where many selective pressures act simultaneously

Gamma-ray and radio properties of six pulsars detected by the fermi large area telescope

We report the detection of pulsed γ-rays for PSRs J0631+1036, J0659+1414, J0742-2822, J1420-6048, J1509-5850, and J1718-3825 using the Large Area Telescope on board the Fermi Gamma-ray Space Telescope (formerly known as GLAST). Although these six pulsars are diverse in terms of their spin parameters, they share an important feature: their γ-ray light curves are (at least given the current count statistics) single peaked. For two pulsars, there are hints for a double-peaked structure in the light curves. The shapes of the observed light curves of this group of pulsars are discussed in the light of models for which the emission originates from high up in the magnetosphere. The observed phases of the γ-ray light curves are, in general, consistent with those predicted by high-altitude models, although we speculate that the γ-ray emission of PSR J0659+1414, possibly featuring the softest spectrum of all Fermi pulsars coupled with a very low efficiency, arises from relatively low down in the magnetosphere. High-quality radio polarization data are available showing that all but one have a high degree of linear polarization. This allows us to place some constraints on the viewing geometry and aids the comparison of the γ-ray light curves with high-energy beam models

Persistence of Folly

Joel B. Lande’s Persistence of Folly challenges the accepted account of the origins of German theater by focusing on the misunderstood figure of the fool, whose spontaneous and impish jest captivated audiences, critics, and playwrights from the late sixteenth through the early nineteenth century. Lande radically expands the scope of literary historical inquiry, showing that the fool was not a distraction from attempts to establish a serious dramatic tradition in the German language. Instead, the fool was both a fixture on the stage and a nearly ubiquitous theme in an array of literary critical, governmental, moral-philosophical, and medical discourses, figuring centrally in broad-based efforts to assign laughter a proper time, place, and proportion in society. Persistence of Folly reveals the fool as a cornerstone of the dynamic process that culminated in the works of Lessing, Goethe, and Kleist. By reorienting the history of German theater, Lande’s work conclusively shows that the highpoint of German literature around 1800 did not eliminate irreverent jest in the name of serious drama, but instead developed highly refined techniques for integrating the comic tradition of the stage fool

On the Paradigmatic Force of Anomaly

No text has shaped the contemporary understanding and analytic use of anomalies as much as Thomas Kuhn’s Structure of Scientific Revolutions (1962). For Kuhn, the anomaly constitutes an exceptional moment in the ordinary course of scientific activity that eventually forces a large-scale revision of the game-rules according to which natural phenomena are investigated, explained, and predicted. Oscillating between novelty and inexplicability, Kuhn’s anomaly tests the limited character of dominant epistemic procedures and encourages the search for new norms and practices

Solgers Dialektik der tragischen Ironie und die Saekularisierung des Todes. Versuch einer kritischen Vergegenwaertigung

L'ironia \ue8 tragica, sia quando la si intende in modo artistico sia quando \ue8 vissuta nell'esperienza diretta. Ci\uf2 la rende particolarmente adatta a contribuire a una secolarizzazione della morte in modo da non viverla pi\uf9 come evento metafisico bens\uec come parte integrante della vita