983 resultados para Cur met tilt


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Ms. autographe des Mémoires de Cl. Haton, publiés par F. Bourquelot dans les Documents inédits (1857). — Le ms. est incomplet ; il commence à l'année 1553 (chapitre 39) et finit à l'année 1582. A la fin (fol. 1027), est le testament de Cl. Haton, daté du 28 janvier 1605.

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Ms. autographe des Mémoires de Cl. Haton, publiés par F. Bourquelot dans les Documents inédits (1857). — Le ms. est incomplet ; il commence à l'année 1553 (chapitre 39) et finit à l'année 1582. A la fin (fol. 1027), est le testament de Cl. Haton, daté du 28 janvier 1605.

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Cerebral blood flow can be studied in a multislice mode with a recently proposed perfusion sequence using inversion of water spins as an endogenous tracer without magnetization transfer artifacts. The magnetization transfer insensitive labeling technique (TILT) has been used for mapping blood flow changes at a microvascular level under motor activation in a multislice mode. In TILT, perfusion mapping is achieved by subtraction of a perfusion-sensitized image from a control image. Perfusion weighting is accomplished by proximal blood labeling using two 90 degrees radiofrequency excitation pulses. For control preparation the labeling pulses are modified such that they have no net effect on blood water magnetization. The percentage of blood flow change, as well as its spatial extent, has been studied in single and multislice modes with varying delays between labeling and imaging. The average perfusion signal change due to activation was 36.9 +/- 9.1% in the single-slice experiments and 38.1 +/- 7.9% in the multislice experiments. The volume of activated brain areas amounted to 1.51 +/- 0.95 cm3 in the contralateral primary motor (M1) area, 0.90 +/- 0.72 cc in the ipsilateral M1 area, 1.27 +/- 0.39 cm3 in the contralateral and 1.42 +/- 0.75 cm3 in the ipsilateral premotor areas, and 0.71 +/- 0.19 cm3 in the supplementary motor area.

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Naturally acquired immune responses against human cancers often include CD8(+) T cells specific for the cancer testis antigen NY-ESO-1. Here, we studied T cell receptor (TCR) primary structure and function of 605 HLA-A*0201/NY-ESO-1(157-165)-specific CD8 T cell clones derived from five melanoma patients. We show that an important proportion of tumor-reactive T cells preferentially use TCR AV3S1/BV8S2 chains, with remarkably conserved CDR3 amino acid motifs and lengths in both chains. All remaining T cell clones belong to two additional sets expressing BV1 or BV13 TCRs, associated with alpha-chains with highly diverse VJ usage, CDR3 amino acid sequence, and length. Yet, all T cell clonotypes recognize tumor antigen with similar functional avidity. Two residues, Met-160 and Trp-161, located in the middle region of the NY-ESO-1(157-165) peptide, are critical for recognition by most of the T cell clonotypes. Collectively, our data show that a large number of alphabeta TCRs, belonging to three distinct sets (AVx/BV1, AV3/BV8, AVx/BV13) bind pMHC with equal antigen sensitivity and recognize the same peptide motif. Finally, this in-depth study of recognition of a self-antigen suggests that in part similar biophysical mechanisms shape TCR repertoires toward foreign and self-antigens.

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Cet article propose un retour méthodologique sur une enquête de terrain parmi les policiers de la ville de Lausanne (Suisse). En plus des observations conduites, des photographies ont été prises durant les patrouilles. Les images produites par le chercheur ont alors fait l'objet d'une présentation systématique aux enquêtés. Cet échange in situ autour des photographies a ouvert des pistes pour documenter empiriquement l'organisation professionnelle des regards, ainsi que les « compétences visuelles » à l'oeuvre dans le contexte du travail policier.