185 research outputs found

    Exploring gender bias in six key domains of academic science: an adversarial collaboration

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    Claims of gender bias in academic science have been widely published, including general descriptions of systemic societal factors that limit women—such as their roles as primary parents and caregivers—and more specific statements asserting sexism at key evaluation points of academic careers. We comprehensively reviewed the evidence in published research regarding differential treatment by gender for six key evaluation domains in the tenure-track academy: hiring, grant funding, journal acceptances, teaching ratings, recommendation letters, and salary, over a 20-year period (2000 to 2020). We focused on these specific domains because they are readily operationalizable and they are represented across a vast literature available for quantitative analysis. Contrary to omnipresent claims in top journals and the media, we found that tenure-track women are at parity with men in three domains (U.S. grant funding, journal acceptances, and recommendation letters), and women are advantaged over men in the domain of hiring. However, for teaching ratings and salary, we found evidence of bias against women. In the four domains in which we failed to find evidence of bias against women, we nevertheless acknowledge that broad societal structural factors may still impede women’s advancement in academic science. We suggest that efforts and resources to combat bias be redirected and focused on domains in which empirically demonstrable bias actually persists.Published versio

    Evaluation of encapsulated liver cell spheroids in a fluidised-bed bioartificial liver for treatment of ischaemic acute liver failure in pigs in a translational setting

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    Liver failure is an increasing problem. Donor-organ shortage results in patients dying before receiving a transplant. Since the liver can regenerate, alternative therapies providing temporary liver-support are sought. A bioartificial-liver would temporarily substitute function in liver failure buying time for liver regeneration/organ-procurement. Our aim: to develop a prototype bioartificial-liver-machine (BAL) comprising a human liver-derived cell-line, cultured to phenotypic competence and deliverable in a clinical setting to sites distant from its preparation. The objective of this study was to determine whether its use would improve functional parameters of liver failure in pigs with acute liver failure, to provide proof-of-principle. HepG2cells encapsulated in alginate-beads, proliferated in a fluidised-bed-bioreactor providing a biomass of 4-6Ă—10 10 cells, were transported from preparation-laboratory to point-of-use operating theatre (6000miles) under perfluorodecalin at ambient temperature. Irreversible ischaemic liver failure was induced in anaesthetised pigs, after portal-systemic-shunt, by hepatic-artery-ligation. Biochemical parameters, intracranial pressure, and functional-clotting were measured in animals connected in an extracorporeal bioartificial-liver circuit. Efficacy was demonstrated comparing outcomes between animals connected to a circuit containing alginate-encapsulated cells (Cell-bead BAL), and those connected to circuit containing alginate capsules without cells (Empty-bead BAL). Cells of the biomass met regulatory standards for sterility and provenance. All animals developed progressive liver-failure after ischaemia induction. Efficacy of BAL was demonstrated since animals connected to a functional biomass (+ cells) had significantly smaller rises in intracranial pressure, lower ammonia levels, more bilirubin conjugation, improved acidosis and clotting restoration compared to animals connected to the circuit without cells. In the +cell group, human proteins accumulated in pigs' plasma. Delivery of biomass using a short-term cold-chain enabled transport and use without loss of function over 3days. Thus, a fluidised-bed bioreactor containing alginate-encapsulated HepG2cell-spheroids improved important parameters of acute liver failure in pigs. The system can readily be up-scaled and transported to point-of-use justifying development at clinical scale

    Green Bank and Effelsberg Radio Telescope Searches for Axion Dark Matter Conversion in Neutron Star Magnetospheres

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    Axion dark matter (DM) may convert to radio-frequency electromagnetic radiation in the strong magnetic fields around neutron stars. The radio signature of such a process would be an ultra-narrow spectral peak at a frequency determined by the mass of the axion particle. We analyze data we collected from the Robert C. Byrd Green Bank Telescope in the L-band and the Effelsberg 100-m Telescope in the L-Band and S-band from a number of sources expected to produce bright signals of axion-photon conversion, including the Galactic Center of the Milky Way and the nearby isolated neutron stars RX J0720.4-3125 and RX J0806.4-4123. We find no evidence for axion DM and are able to set some of the strongest constraints to-date on the existence of axion DM in the highly-motivated mass range between ~5-11 ÎĽ\mueV.Comment: 7+20 pages, 2+17 figures, Supplementary Data at http://github.com/joshwfoster/RadioAxionSearc

    Law of denial

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    Law’s claim of mastery over past political violence is frequently undermined by reversals of that relationship of mastery, so that the violence of the law, and especially its symbolic violence, becomes easily incorporated into longues durées of political violence, rather than mastering them, settling them, or providing closure. Doing justice to the past, therefore, requires a political and theoretical attunement to the ways in which law, in purportedly attempting to address past political violence, inscribes itself into contemporary contexts of violence. While this may be limited to an analysis of how law is an effect of and affects the political, theoretically this attunement can be further refined by means of a critique of dynamics that are internal to law itself and that have to do with how law understands its own historicity, as well as its relationship to history and historiography. This article aims to pursue such a critique, taking as its immediate focus the ECHR case of Perinçek v Switzerland, with occasional forays into debates around the criminalisation of Armenian genocide denialism in France. The Perinçek case concerned Switzerland's criminalisation of the denial of the Armenian genocide, and concluded in 2015 after producing two judgments, first by the Second Chamber, and then by the Grand Chamber of the ECHR. However, although they both found for the applicant, the two benches had very different lines of reasoning, and notably different conceptions regarding the relationship between law and history. I proceed by tracing the shifting status of 'history' and 'historians' in these two judgments, and paying attention to the deferrals, disclaimers and ellipses that structure law's relation to history. This close reading offers the opportunity for a critical reappraisal of the relationship between law, denial and violence: I propose that the symbolic violence of the law operative in memory laws is a product of that which remains unresolved in law's understanding of historicity (including its own), its self-understanding vis-à-vis the task of historiography, and its inability to respond to historical violence without inscribing itself into a history of violence, a process regarding which it remains in denial

    Gain-of-Function R225W Mutation in Human AMPKÎł3 Causing Increased Glycogen and Decreased Triglyceride in Skeletal Muscle

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    BACKGROUND: AMP-activated protein kinase (AMPK) is a heterotrimeric enzyme that is evolutionarily conserved from yeast to mammals and functions to maintain cellular and whole body energy homeostasis. Studies in experimental animals demonstrate that activation of AMPK in skeletal muscle protects against insulin resistance, type 2 diabetes and obesity. The regulatory gamma(3) subunit of AMPK is expressed exclusively in skeletal muscle; however, its importance in controlling overall AMPK activity is unknown. While evidence is emerging that gamma subunit mutations interfere specifically with AMP activation, there remains some controversy regarding the impact of gamma subunit mutations. Here we report the first gain-of-function mutation in the muscle-specific regulatory gamma(3) subunit in humans. METHODS AND FINDINGS: We sequenced the exons and splice junctions of the AMPK gamma(3) gene (PRKAG3) in 761 obese and 759 lean individuals, identifying 87 sequence variants including a novel R225W mutation in subjects from two unrelated families. The gamma(3) R225W mutation is homologous in location to the gamma(2)R302Q mutation in patients with Wolf-Parkinson-White syndrome and to the gamma(3)R225Q mutation originally linked to an increase in muscle glycogen content in purebred Hampshire Rendement Napole (RN-) pigs. We demonstrate in differentiated muscle satellite cells obtained from the vastus lateralis of R225W carriers that the mutation is associated with an approximate doubling of both basal and AMP-activated AMPK activities. Moreover, subjects bearing the R225W mutation exhibit a approximately 90% increase of skeletal muscle glycogen content and a approximately 30% decrease in intramuscular triglyceride (IMTG). CONCLUSIONS: We have identified for the first time a mutation in the skeletal muscle-specific regulatory gamma(3) subunit of AMPK in humans. The gamma(3)R225W mutation has significant functional effects as demonstrated by increases in basal and AMP-activated AMPK activities, increased muscle glycogen and decreased IMTG. Overall, these findings are consistent with an important regulatory role for AMPK gamma(3) in human muscle energy metabolism
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