110 research outputs found

    The Testing Culture and the Persistence of High Stakes Testing Reforms

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    The purposes of this critical analysis are to clarify why high stakes testing reforms have become so prevalent in the United States and to explain the connection between current federal and state emphases on standardized testing reforms and educational opportunities. The article outlines the policy context for high stakes examinations, as well as the ideas of testing and accountability as major tenets of current education reform and policy. In partial explanation of the widespread acceptance and use of standardized tests in the United States, we argue that there is a pervasive testing culture, in addition to other contributing factors such as administrative utility, profit motives, and political ideology. Finally, we offer a critique of high stakes testing reforms in light of concerns about equality of educational opportunity

    Ideais Contestados: entendendo as divergências morais sobre política educacional

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    No dia 23 de junho de 2003, a Suprema Corte dos Estados Unidos decidiu que a consideração de raça e etnia na seleção de alunos para as universidades é constitucional'. Seria de se esperar que, após essa decisão, os campos adversários no debate sobre a ação afirmativa dariam sua disputa por encerrada. Mas não foi isso que aconteceu. As decisões sobre os dois casos da Universidade de Michigan não encerraram o intenso conflito moral e político sobre a ação afirmativa. Na verdade, a principal estratégia dos adversários mudou: deixaram de lado os processos judiciais e passaram a promover plebiscitos em nível estadual. O debate em tomo do tema é exemplo de uma duradoura divergência de ordem moral que, provoca profundo conflito acerca de ideais como os da igualdade e da liberdade.O objetivo deste trabalho é examinar as raízes políticas e morais de divergências sobre políticas educacionais. Meu argumento é que a compreensão da natureza da divergência moral enriquece a discussão a respeito de controvérsias específicas, ligadas a políticas de tratamento ético dos estudantes. A fim de esclarecer os termos da divergência moral sobre a ação afirmativa, investigo de que forma as principais teorias políticas de justiça, que dominam o debate - a teoria política libertária e a teoria política igualitária - interpretam os ideais morais de igualdade e liberdade. Depois, examino a relação entre a divergência moral e a política educacional, dedicando especial atenção à razão pela qual é importante entender e tratar desse tema

    Rhodium(II) Proximity-Labeling Identifies a Novel Target Site on STAT3 for Inhibitors with Potent Anti-Leukemia Activity

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    Nearly 40 % of children with acute myeloid leukemia (AML) suffer relapse arising from chemoresistance, often involving upregulation of the oncoprotein STAT3 (signal transducer and activator of transcription 3). Herein, rhodium(II)-catalyzed, proximity-driven modification identifies the STAT3 coiled-coil domain (CCD) as a novel ligand-binding site, and we describe a new naphthalene sulfonamide inhibitor that targets the CCD, blocks STAT3 function, and halts its disease-promoting effects in vitro, in tumor growth models, and in a leukemia mouse model, validating this new therapeutic target for resistant AML

    Enhanced axonal response of mitochondria to demyelination offers neuroprotection:implications for multiple sclerosis

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    Axonal loss is the key pathological substrate of neurological disability in demyelinating disorders, including multiple sclerosis (MS). However, the consequences of demyelination on neuronal and axonal biology are poorly understood. The abundance of mitochondria in demyelinated axons in MS raises the possibility that increased mitochondrial content serves as a compensatory response to demyelination. Here, we show that upon demyelination mitochondria move from the neuronal cell body to the demyelinated axon, increasing axonal mitochondrial content, which we term the axonal response of mitochondria to demyelination (ARMD). However, following demyelination axons degenerate before the homeostatic ARMD reaches its peak. Enhancement of ARMD, by targeting mitochondrial biogenesis and mitochondrial transport from the cell body to axon, protects acutely demyelinated axons from degeneration. To determine the relevance of ARMD to disease state, we examined MS autopsy tissue and found a positive correlation between mitochondrial content in demyelinated dorsal column axons and cytochrome c oxidase (complex IV) deficiency in dorsal root ganglia (DRG) neuronal cell bodies. We experimentally demyelinated DRG neuron-specific complex IV deficient mice, as established disease models do not recapitulate complex IV deficiency in neurons, and found that these mice are able to demonstrate ARMD, despite the mitochondrial perturbation. Enhancement of mitochondrial dynamics in complex IV deficient neurons protects the axon upon demyelination. Consequently, increased mobilisation of mitochondria from the neuronal cell body to the axon is a novel neuroprotective strategy for the vulnerable, acutely demyelinated axon. We propose that promoting ARMD is likely to be a crucial preceding step for implementing potential regenerative strategies for demyelinating disorders.</p
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