998 resultados para DORSTENIA-BRYONIIFOLIA MART EX MIQ


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[Missel romain (latin). 1629]

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BACKGROUND: Intimal hyperplasia (IH) is a vascular remodeling process which often leads to failure of arterial bypass or hemodialysis access. Experimental and clinical work have provided insight in IH development; however, further studies under precise controlled conditions are required to improve therapeutic strategies to inhibit IH development. Ex vivo perfusion of human vessel segments under standardized hemodynamic conditions may provide an adequate experimental approach for this purpose. Therefore, chronically perfused venous segments were studied and compared to traditional static culture procedures with regard to functional and histomorphologic characteristics as well as gene expression. MATERIALS AND METHODS: Static vein culture allowing high tissue viability was performed as previously described. Ex vivo vein support system (EVVSS) was performed using a vein support system consisting of an incubator with a perfusion chamber and a pump. EVVSS allows vessel perfusion under continuous flow while maintaining controlled hemodynamic conditions. Each human saphenous vein was divided in two parts, one cultured in a Pyrex dish and the other part perfused in EVVSS for 14days. Testing of vasomotion, histomorphometry, expression of CD 31, Factor VIII, MIB 1, alpha-actin, and PAI-l were determined before and after 14days of either experimental conditions. RESULTS: Human venous segments cultured under traditional or perfused conditions exhibited similar IH after 14 days as shown by histomorphometry. Smooth-muscle cell (SMC) was preserved after chronic perfusion. Although integrity of both endothelial and smooth-muscle cells appears to be maintained in both culture conditions as confirmed by CD31, factor VIII, and alpha-actin expression, a few smooth-muscle cells in the media stained positive for factor VIII. Cell-proliferation marker MIB-1 was also detected in the two settings and PAI-1 mRNA expression and activity increased significantly after 14 days of culture and perfusion. CONCLUSION: This study demonstrates the feasibility to chronically perfuse human vessels under sterile conditions with preservation of cellular integrity and vascular contractility. To gain insights into the mechanisms leading to IH, it will now be possible to study vascular remodeling not only under static conditions but also in hemodynamic environment mimicking as closely as possible the flow conditions encountered in reconstructive vascular surgery.

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Phenotypic and functional cell properties are usually analyzed at the level of defined cell populations but not single cells. Yet, large differences between individual cells may have important functional consequences. It is likely that T-cell-mediated immunity depends on the polyfunctionality of individual T cells, rather than the sum of functions of responding T-cell subpopulations. We performed highly sensitive single-cell gene expression profiling, allowing the direct ex vivo characterization of individual virus-specific and tumor-specific T cells from healthy donors and melanoma patients. We have previously shown that vaccination with the natural tumor peptide Melan-A-induced T cells with superior effector functions as compared with vaccination with the analog peptide optimized for enhanced HLA-A*0201 binding. Here we found that natural peptide vaccination induced tumor-reactive CD8 T cells with frequent coexpression of both memory/homing-associated genes (CD27, IL7R, EOMES, CXCR3, and CCR5) and effector-related genes (IFNG, KLRD1, PRF1, and GZMB), comparable with protective Epstein-Barr virus-specific and cytomegalovirus-specific T cells. In contrast, memory/homing-associated and effector-associated genes were less frequently coexpressed after vaccination with the analog peptide. Remarkably, these findings reveal a previously unknown level of gene expression diversity among vaccine-specific and virus-specific T cells with the simultaneous coexpression of multiple memory/homing-related and effector-related genes by the same cell. Such broad functional gene expression signatures within antigen-specific T cells may be critical for mounting efficient responses to pathogens or tumors. In summary, direct ex vivo high-resolution molecular characterization of individual T cells provides key insights into the processes shaping the functional properties of tumor-specific and virus-specific T cells.

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On October 5, 2010 there were 25,829 probationers and parolees (including special sentence) under community-based corrections field supervision statewide. As shown in the pie charts below, LSI-R offender assessments show that a sizeable percent of offenders are dissatisfied with their living accommodations – particularly for higher risk offenders.

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Vitiligo, a skin disorder characterized by the spontaneous destruction of melanocytes, is believed to be of autoimmune origin. We investigated the presence and functionality of CD8(+) T-cells specific for the melanocyte-associated antigens Melan-A, gp100, tyrosinase, and TRP-2 in the blood of HLA-A2(+) vitiligo patients. We enumerated antigen-specific CD8(+) T cells by major histocompatibility complex multimer staining directly ex vivo, as well as after 9 days of in vitro stimulation and assessed IFN-gamma secretion by enzyme-linked immunospot (Elispot) assay. Tyrosinase-, gp100-, or TRP-2-specific CD8(+) T cells could not be identified in the peripheral blood of individuals with vitiligo. Although Melan-A-specific T cells were detectable at levels comparable to Flu-MP-specific T cells by multimer staining, these lymphocytes did not express the skin-homing receptor cutaneous lymphocyte antigen, were phenotypically naïve (CD45RA(+)), and were unresponsive in the IFN-gamma Elispot assay, suggesting that they are unlikely to be involved in the etiopathogenesis of vitiligo.

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ABSTRACT The economic exploitation of macaw palm [Acrocomia aculeate(Jacq.) Lodd. ex Mart.] is currently in transition, from extractivism to agricultural cultivation, thus requiring studies on the fertilization of the crop. This study evaluated the response of three genotypes of macaw palm to increasing rates of nitrogen and potassium, grown in the field until the 2nd year and to establish reference contents of mineral nutrients in the leaf. The experiment was a split-plot randomized block design with five main treatments (N and K rates) and three secondary treatments (genotypes), with three replications, each plot containing three plants. Plant height, leaf number, vigor, and nutrient contents in leaf tissues were evaluated at the end of 2nd year of cultivation. Differential responses were observed among genotypes, indicating that some genotypes are more efficient in the use of mineral inputs. There was a differentiated and positive response to increasing side-dressed N and K rates in the vegetative development of macaw genotypes until the 2nd year of field cultivation, indicating variability in the species in terms of nutrient use efficiency. The N and K fertilization rate corresponding to 360 g N + 480 g K2O per plant, in four split applications over the two years of cultivation, was insufficient to induce maximum vegetative development in the three macaw genotypes. There was no variation in macro- and micronutrient contents in leaf dry matter of the three macaw genotypes.

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Currently, Iowa law lacks statutory language that would include Iowans with a criminal history as a protected class (this lack of coverage mirrors most of the nation). However, Iowa has been shown to parallel EEOC guidance that states that an employer may exclude an individual from employment on the basis of a conviction record only if the employer’s decision was “justified by business necessity.”

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Many new types of vaccines against infectious or malignant diseases are currently being proposed. Careful characterization of the induced immune response is required in assessing their efficiency. While in most studies human tumor antigen-specific T cells are analyzed after in vitro re-stimulation, we investigated these T cells directly ex vivo using fluorescent tetramers. In peripheral blood lymphocytes from untreated melanoma patients with advanced disease, a fraction of tumor antigen (Melan-A/MART-1)-specific T cells were non-naive, thus revealing tumor-driven immune activation. After immunotherapy with synthetic peptides plus adjuvant, we detected tumor antigen-specific T cells that proliferated and differentiated to memory cells in vivo in some melanoma patients. However, these cells did not present the features of effector cells as found in cytomegalovirus specific T cells analyzed in parallel. Thus, peptide plus adjuvant vaccines can lead to activation and expansion of antigen specific CD8(+) T cells in PBL. Differentiation to protective CD8(+) effector cells may, however, require additional vaccine components that stimulate T cells more efficiently, a major challenge for the development of future immunotherapy.

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Contient : N° 53 Sceau de Catherine d'Alençon, duchesse de Bavière (1416) ; Nos 56 et 57 Sceaux de Jean, duc de Calabre et de Lorraine (31 octobre 1465) et de son fils aîné ; N° 58 Sceau de Marguerite, reine d'Angleterre (1470) ; N° 59 Sceau de Bernardin Bochetel, évêque de Rennes (1564) ; N° 61 « S. Petri, Dei gratia archiepiscopi Tholosani » [Pierre V de Lion ?] ; Nos 62 et 64 Sceau de Robert d'Alençon, comte du Perche (1370 et 1375) ; Nos 72 et 81 Médailles du roi René (dessins) ; N° 73 Sceau de Jeanne, reine de Jérusalem, Sicile et Aragon (1498), avec contre-sceau ; N° 74 Sceau et contre-sceau de Louis de France, duc d'Anjou et roi de Sicile ; N° 75 Sceau d'Isabelle, comtesse du Maine et de Guise (1462), avec contresceau ; N° 76 Sceau et contre-sceau de René d'Anjou, roi de Sicile et de Jérusalem ; N° 77 « [S. Nicolai] ducis Calabrie, Lotharingie, A[ndegavie]..., » avec contre-sceau ; N° 78 Sceau de Pierre, comte d'Alençon, seigneur de Fougères, vicomte de Beaumont (1378), avec contre-sceau ; Nos 79 et 82 Sceau et contre-sceau de Louis II, roi de Jérusalem et de Sicile et comte d'Anjou (1407 et 1408) ; Nos 80 et 88 Sceau et contre-sceau de Robert, comte d'Artois ; N° 84 « S. novum Ludovici, regis Fran. filii, ducis Andegavensis et comitis Cenomannensis, » avec contre-sceau (1374) ; N° 85 Sceau et contre-sceau de Catherine, fille aînée du duc d'Alençon, « comtesse de Montfort, dame de Sonois » ; N° 86 Sceau et contre-sceau de Charles, comte du Maine (1451) ; N° 87 « Scel René d'Anjou, chlr., baron et s. de Mézières et de Thury, » avec contre-sceau ; N° 89 Sceau de Yolande reine de Jérusalem et de Sicile (1428) ; N° 94 Sceau d'Henri de Carinthie, évêque de Troyes ; cf. vol. 3101, n° 8 ; N° 101 Sceau de Charles, comte d'Alençon (1361) ; N° 112 Sceau d'Antoine de Cravant, abbé de la Trinité de Vendôme ; cf. vol. 3113, n° 7 ; N° 113 « Sigillum Johannis, episcopi Silvanectensis » [Jean Neveu † 1499, ou Jean Calveau † 1522] ; N° 115 Sceau de Jean de Tinteniac du Percher, abbé de Saint-Aubin († 1525) ; N° 120 « Scel Pierre, bastart d'Alençon » (1419) ; N° 128 « Constras. Ludovici, regis condam Francor. filii, ducis Andegavie et comit. Cenamanie. » ; N° 154 Sceau de Mathieu, évêque de Troyes (1169-1180) ; N° 257 Sceau de René, duc d'Alençon (1478)

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The mainstay of contemporary therapies for extensive occlusive arterial disease is venous bypass graft. However, its durability is threatened by intimal hyperplasia (IH) that eventually leads to vessel occlusion and graft failure. Mechanical forces, particularly low shear stress and high wall tension, are thought to initiate and to sustain these cellular and molecular changes, but their exact contribution remains to be unraveled. To selectively evaluate the role of pressure and shear stress on the biology of IH, an ex vivo perfusion system (EVPS) was created to perfuse segments of human saphenous veins under arterial regimen (high shear stress and high pressure). Further technical innovations allowed the simultaneous perfusion of two segments from the same vein, one reinforced with an external mesh. Veins were harvested using a no-touch technique and immediately transferred to the laboratory for assembly in the EVPS. One segment of the freshly isolated vein was not perfused (control, day 0). The two others segments were perfused for up to 7 days, one being completely sheltered with a 4 mm (diameter) external mesh. The pressure, flow velocity, and pulse rate were continuously monitored and adjusted to mimic the hemodynamic conditions prevailing in the femoral artery. Upon completion of the perfusion, veins were dismounted and used for histological and molecular analysis. Under ex vivo conditions, high pressure perfusion (arterial, mean = 100 mm Hg) is sufficient to generate IH and remodeling of human veins. These alterations are reduced in the presence of an external polyester mesh.