982 resultados para Mostaert, Gillis, 1534?-1598.
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Poems.
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describebat Abrah. Ortelius.
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Title from f. 2r.
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A work on subtleties of Persian vocabulary. Discusses nuances of and differences in meaning between homographs or near-homographs and words derived from similar stems. Pronunciations, etymologies, differences in usage discussed. Poems used as examples.
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A biography of Naqshabandi shaykh Khvājah Isḥāq, written by a disciple of his.
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A collection of more than 80 short treatises by various authors on various topics as well as numerous excerpts from different sources.
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Title from caption.
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Cream laid paper. 20 x 13 cm. (16 x 8.5 cm.).
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The dichotomies Weight/Lightness and Form/Idea formed the theory and the practice of Art, existing a correspondence between them. The weight exists thanks to the existence of a form that is made of matter; in the other hand, the lightness comes from the idea that is always present when the creation exists. This dichotomies were always interconnected during the centuries, and there are variations in relevancy of form and/or idea. In sculpture´s tradition, the physical weight was a essential reality, and the idea of sculpture, without the immaterial side was underlined to the form. During the centuries, new artistic approaches were born and re-born focused on the frailty, lightness and idea of the artistic object, fact that came to cancel the classic notion of work of art. The concept of image became the focus of the esthetical experience of the subject, which alone, tended to substantiate the artistic object itself. In the same way that lightness, when taken to the extreme, and despite the tridimensionality materiality of the object, begun to relate the art with the own action of the body, the gesture of the artist, rising both to the status of art
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Animals from flies to humans adjust their development in response to environmental conditions through a series of developmental checkpoints, which alter the sensitivity of organs to environmental perturbation. Despite their importance, we know little about the molecular mechanisms through which this change in sensitivity occurs. Here we identify two phases of sensitivity to larval nutrition that contribute to plasticity in ovariole number, an important determinant of fecundity, in Drosophila melanogaster. These two phases of sensitivity are separated by the developmental checkpoint called "critical weight"; poor nutrition has greater effects on ovariole number in larvae before critical weight than after. We find that this switch in sensitivity results from distinct developmental processes. In precritical weight larvae, poor nutrition delays the onset of terminal filament cell differentiation, the starting point for ovariole development, and strongly suppresses the rate of terminal filament addition and the rate of increase in ovary volume. Conversely, in postcritical weight larvae, poor nutrition affects only the rate of increase in ovary volume. Our results further indicate that two hormonal pathways, the insulin/insulin-like growth factor and the ecdysone-signaling pathways, modulate the timing and rates of all three developmental processes. The change in sensitivity in the ovary results from changes in the relative contribution of each pathway to the rates of terminal filament addition and increase in ovary volume before and after critical weight. Our work deepens our understanding of how hormones act to modify the sensitivity of organs to environmental conditions, thereby affecting their plasticity.
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Centromeres form the site of chromosome attachment to microtubules during mitosis. Identity of these loci is maintained epigenetically by nucleosomes containing the histone H3 variant CENP-A. Propagation of CENP-A chromatin is uncoupled from DNA replication initiating only during mitotic exit. We now demonstrate that inhibition of Cdk1 and Cdk2 activities is sufficient to trigger CENP-A assembly throughout the cell cycle in a manner dependent on the canonical CENP-A assembly machinery. We further show that the key CENP-A assembly factor Mis18BP1(HsKNL2) is phosphorylated in a cell cycle-dependent manner that controls its centromere localization during mitotic exit. These results strongly support a model in which the CENP-A assembly machinery is poised for activation throughout the cell cycle but kept in an inactive noncentromeric state by Cdk activity during S, G2, and M phases. Alleviation of this inhibition in G1 phase ensures tight coupling between DNA replication, cell division, and subsequent centromere maturation.
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Hox genes are essential for the patterning of the axial skeleton. Hox group 10 has been shown to specify the lumbar domain by setting a rib-inhibiting program in the presomitic mesoderm (PSM). We have now produced mice with ribs in every vertebra by ectopically expressing Hox group 6 in the PSM, indicating that Hox genes are also able to specify the thoracic domain. We show that the information provided by Hox genes to specify rib-containing and rib-less areas is first interpreted in the myotome through the regional-specific control of Myf5 and Myf6 expression. This information is then transmitted to the sclerotome by a system that includes FGF and PDGF signaling to produce vertebrae with or without ribs at different axial levels. Our findings offer a new perspective of how Hox genes produce global patterns in the axial skeleton and support a redundant nonmyogenic role of Myf5 and Myf6 in rib formation.
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The vertebrate body is made by progressive addition of new tissue from progenitors at the posterior embryonic end. Axial extension involves different mechanisms that produce internal organs in the trunk but not in the tail. We show that Gdf11 signaling is a major coordinator of the trunk-to-tail transition. Without Gdf11 signaling, the switch from trunk to tail is significantly delayed, and its premature activation brings the hindlimbs and cloaca next to the forelimbs, leaving extremely short trunks. Gdf11 activity includes activation of Isl1 to promote formation of the hindlimbs and cloaca-associated mesoderm as the most posterior derivatives of lateral mesoderm progenitors. Gdf11 also coordinates reallocation of bipotent neuromesodermal progenitors from the anterior primitive streak to the tail bud, in part by reducing the retinoic acid available to the progenitors. Our findings provide a perspective to understand the evolution of the vertebrate body plan.
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Dissertação, Mestrado, Contabilidade e Fiscalidade, Instituto Politécnico de Santarém, Escola Superior de Gestão e Tecnologia, 2016
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Sign.: A-Z8, 2A-2F8