73 research outputs found

    A Spinal Cord Astrocytoma and Its Concurrent Osteoblastic Metastases at the Time of the Initial Diagnosis: a Case Report and Literature Review

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    Bone metastasis from a spinal cord astrocytoma has been reported only twice in the English medical literature. It is generally known that bone metastasis is found after the initial diagnosis with/without intervening surgery rather than being found at the time of the diagnosis of astrocytoma. The purpose of this article is to report for the first time a case of concurrent bone metastasis from a spinal cord astrocytoma at the time of diagnosing the spinal cord astrocytoma

    A highly invasive human glioblastoma pre-clinical model for testing therapeutics

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    Animal models greatly facilitate understanding of cancer and importantly, serve pre-clinically for evaluating potential anti-cancer therapies. We developed an invasive orthotopic human glioblastoma multiforme (GBM) mouse model that enables real-time tumor ultrasound imaging and pre-clinical evaluation of anti-neoplastic drugs such as 17-(allylamino)-17-demethoxy geldanamycin (17AAG). Clinically, GBM metastasis rarely happen, but unexpectedly most human GBM tumor cell lines intrinsically possess metastatic potential. We used an experimental lung metastasis assay (ELM) to enrich for metastatic cells and three of four commonly used GBM lines were highly metastatic after repeated ELM selection (M2). These GBM-M2 lines grew more aggressively orthotopically and all showed dramatic multifold increases in IL6, IL8, MCP-1 and GM-CSF expression, cytokines and factors that are associated with GBM and poor prognosis. DBM2 cells, which were derived from the DBTRG-05MG cell line were used to test the efficacy of 17AAG for treatment of intracranial tumors. The DMB2 orthotopic xenografts form highly invasive tumors with areas of central necrosis, vascular hyperplasia and intracranial dissemination. In addition, the orthotopic tumors caused osteolysis and the skull opening correlated to the tumor size, permitting the use of real-time ultrasound imaging to evaluate antitumor drug activity. We show that 17AAG significantly inhibits DBM2 tumor growth with significant drug responses in subcutaneous, lung and orthotopic tumor locations. This model has multiple unique features for investigating the pathobiology of intracranial tumor growth and for monitoring systemic and intracranial responses to antitumor agents

    Search for periodic signals in the dielectron and diphoton invariant mass spectra using 139 fb−1 of pp collisions at √s = 13 TeV with the ATLAS detector

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    A search for physics beyond the Standard Model inducing periodic signals in the dielectron and diphoton invariant mass spectra is presented using 139 fb−1 of √s =13 TeV pp collision data collected by the ATLAS experiment at the LHC. Novel search techniques based on continuous wavelet transforms are used to infer the frequency of periodic signals from the invariant mass spectra and neural network classifiers are used to enhance the sensitivity to periodic resonances. In the absence of a signal, exclusion limits are placed at the 95% confidence level in the two-dimensional parameter space of the clockwork gravity model. Model-independent searches for deviations from the background-only hypothesis are also performed

    Search for periodic signals in the dielectron and diphoton invariant mass spectra using 139 fb−1 of pp collisions at √s = 13 TeV with the ATLAS detector

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    A search for physics beyond the Standard Model inducing periodic signals in the dielectron and diphoton invariant mass spectra is presented using 139 fb−1 of √s = 13 TeV pp collision data collected by the ATLAS experiment at the LHC. Novel search techniques based on continuous wavelet transforms are used to infer the frequency of periodic signals from the invariant mass spectra and neural network classifiers are used to enhance the sensitivity to periodic resonances. In the absence of a signal, exclusion limits are placed at the 95% confidence level in the two-dimensional parameter space of the clockwork gravity model. Model-independent searches for deviations from the background-only hypothesis are also performed

    Lope de Aguirre el eterno viajero : su trayectoria discursiva en el imaginario cultural hispĂĄnico.

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    Cette these a pour objet d'etudier la trajectoire discursive de Lope de Aguirre, le fameux rebelle basque de la periode de la Conquete de l'Amerique, dans l'imaginaire culturel hispanique du XVIe siecle a nos jours. Durement vilipende par les chroniqueurs du XVIe siecle, notre personnage sera tour a tour repris par des historiens des XVIIe et XVII1e siecles, par Simon Bolivar et un medecin de l'elite creole du XIXe siecle, et par des historiens, romanciers et cineastes du XXe siecle, qui l'utilisent dans un dialogue implicite avec le nationalisme basque, le nazisme, le franquisme, la guerre des guerrillas latino-americaine et ainsi de suite. Nous essayons donc de demontrer qu'a chaque occasion les diverses appropriations d'Aguirre repondent aux conditions sociales, politiques et historiques propres au contexte de production donne. Mais une question s'impose: pourquoi la figure d'Aguirre, un rebelle parmi d'autres, genere-t-elle un nombre aussi grand de discours et textes a son sujet? Etait-il vraiment un rebelle comme les autres? La methodologie que nous utilisons pour traiter ce theme est fort eclectique et puise, entre autres, dans la sociocritique, l'etude du personnage ainsi que du langage, les notions d'intertextualite/interdiscursivite et d'ideologie. Nous esperons demontrer qu'ici l'utilisation d'une approche multi-conceptuelle est des plus productives dans le cadre d'une critique qui se veut a la fois diachronique et textuelle

    Diagnose Ă©cologique du lac Casault, Zec Casault

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    Une diagnose Ă©cologique a Ă©tĂ© rĂ©alisĂ©e sur le lac Casault (secteurs Casault et Causapscal) de la Zec Casault dans la rĂ©gion du Bas-Saint-Laurent, en date du 29 au 31 aoĂ»t 2008. Les objectifs de cette Ă©tude Ă©taient de documenter la qualitĂ© de l’habitat de l’omble de fontaine (Salvelinus fontinalis) dans ce plan d’eau afin de vĂ©rifier si la diminution de la qualitĂ© de pĂȘche observĂ©e depuis quelques annĂ©es n’est pas le rĂ©sultat d’une dĂ©gradation du milieu. Pour ce faire, une pĂȘche expĂ©rimentale ainsi que la bathymĂ©trie du lac ont Ă©tĂ© rĂ©alisĂ©es. De plus, la morphomĂ©trie, les paramĂštres physico-chimiques, les sites de fraie potentiels, les donnĂ©es de l’inventaire ichtyologique ainsi que les statistiques de pĂȘches ont Ă©tĂ© analysĂ©s. Les donnĂ©es recueillies n’ont pas permis de dĂ©celer de problĂšme relativement Ă  l’habitat. Cependant, les statistiques d’exploitation semblent rĂ©vĂ©ler un problĂšme de non-dĂ©claration des prises par les usagers. Afin d’amĂ©liorer la situation de l’omble de fontaine sur ce plan d’eau, des recommandations sont apportĂ©es dans le prĂ©sent rapport
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