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Thema Singuläre Modulformen und involutive AlgebrenMitsos, Markos. January 2001 (has links) (PDF)
Heidelberg, Univ., Diss., 2001. / Computerdatei im Fernzugriff.
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Thema Singuläre Modulformen und involutive AlgebrenMitsos, Markos. January 2001 (has links) (PDF)
Heidelberg, Univ., Diss., 2001. / Computerdatei im Fernzugriff.
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Thema Singuläre Modulformen und involutive AlgebrenMitsos, Markos. January 2001 (has links) (PDF)
Heidelberg, Universiẗat, Diss., 2001.
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Local fusion graphs of finite groupsBallantyne, John Joseph January 2012 (has links)
Let G be a group, with X a G-conjugacy class of involutions. The local fusion graph F(G,X) has X as its vertex set, with vertices x, y in X joined by an edge if, and only if, x is not equal to y and the order of the product xy is odd. In this thesis we study these, and other related graphs, for a variety of finite groups, paying particular attention to the cases where G is a finite group. We also present a computational algorithm regarding centralisers of involutions, which makes use of local fusion graphs.
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Ein Lokal-Global-Prinzip für Involutionen und hermitesche FormenBernauer, Beatrix. January 2004 (has links)
Konstanz, Univ., Diplomarb., 2004.
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Involutions sur les variétés de dimension trois et homologie de KhovanovWatson, Liam January 2009 (has links) (PDF)
Cette thèse établit, et étudie, un lien entre l'homologie de Khovanov et la topologie des revêtements ramifiés doubles. Nous y introduisons certaines propriétés de stabilité en homologie de Khovanov, dont nous dérivons par la suite des obstructions à l'existence de certaines chirurgies exceptionnelles sur les noeuds admettant une involution
appropriée. Ce comportement, analogue à celui de l'homologie de Heegaard-Floer sous chirurgie, renforce ainsi le lien existant (dû à Ozsváth et Szabó) entre homologie de Khovanov, et homologie d'Heegaard-Floer des revêtements ramifiés doubles. Dans l'optique de poursuivre et d'exploiter plus avant cette relation, les méthodes développées dans ce travail sont appliquées à l'étude des L-espaces, et à déterminer, en premier lieu, si l'homologie de Khovanov fournit un invariant des revêtements ramifiés doubles, et en deuxième lieu, si l'homologie de Khovanov permet de détecter le noeud trivial. ______________________________________________________________________________ MOTS-CLÉS DE L’AUTEUR : Homologie de Khovanov, Homologie de Heegaard-Floer, Chirurgies de Dehn, Involutions, Variétés de dimension trois, Revêtements ramifiés doubles.
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On representability of *-regular and regular involutive rings in endomorphism rings of vector spacesNiemann, Niklas Benjamin January 2007 (has links)
Zugl.: Darmstadt, Techn. Univ., Diss., 2007
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Commuting involution graphs of certain finite simple classical groupsEverett, Alistaire Duncan Fraser January 2011 (has links)
For a group G and X a subset of G, the commuting graph of G on X, denoted by C(G,X), is the graph whose vertex set is X with x, y joined by an edge if x not equal to y and x and y commute. If the elements in X are involutions, then C(G,X) is called a commuting involution graph. This thesis studies C(G,X) when G is either a 4-dimensional projective symplectic group; a 3-dimensional unitary group; 4-dimensional unitary group over a field of characteristic 2; a 2-dimensional projective general linear group; or a 4-dimensional affne orthogonal group, and X a G-conjugacy class of involutions. We determine the diameters and structure of thediscs of these graphs.
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Le bouillonnant silence de l'être : interdépendance ontologique et processus d'individuation / The bustling silence of the being : ontological interdependence and process of individuationAdded, Serge 29 June 2016 (has links)
Heidegger considérait en 1969 que "la tentative de penser l'être sans l'étant devient une nécessité" ; cette thèse envisage de mettre en œuvre cette nécessité. L'activité de l'être (ou activité d'être) est l'objet de cette recherche d'où il ressort qu'être, c'est absorber de l'être, involuer de l'être et exprimer de l'être. Être, c'est s'individuer. Être, c'est poursuivre sans cesse un processus d'individuation, courir après, construire perpétuellement un individu qui n'advient jamais. / Heidegger considered in 1969 that "the attempt to think of the being without being it becomes a necessity"; this thesis intends to operate this "necessity". The activity of the being (or the activity to be) is the object of this search, where from it appears that being is to absorb of the being, to involuate the being and to express the being. To be is to ceaselessly become an individual who never happens.
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VEGF e vascularização ao longo do desenvolvimento e involução do timo em suínos / VEGF and vascularization during thymus development and involution in pigs.Machado, Marcello 10 February 2010 (has links)
O timo é um órgão essencial para a maturação, diferenciação e seleção de linfócitos T, consequentemente fundamental para o desenvolvimento da imunidade do organismo. Além do papel na manutenção da integridade tecidual, os vasos sanguíneos tímicos desempenham função no processo de migração de células precursoras de linfócitos para o interior do órgão. Sua arquitetura típica é caracterizada por grandes vasos localizados na junção corticomedular e uma fina cadeia de ramificações e anastomoses no interior do córtex, porém são pouco conhecidas as bases moleculares que induzem a formação desta particular vascularização, bem como os exatos mecanismos que desencadeiam a involução do órgão, evento relacionado a alterações nos padrões vasculares. Entretanto, tem sido demonstrado que as interações entre o estroma, que inclui o endotélio vascular, e o compartimento hematopoiético tímico desempenham papéis cruciais na funcionalidade do órgão. Sendo o VEGF um fator angiogênico essencial na formação do leito vascular tecidual e na modulação de funções diretamente relacionadas à vascularização, objetivamos neste estudo avaliar a expressão gênica e protéica deste fator de crescimento durante estágios de desenvolvimento e involução do órgão. Foram utilizadas amostras de timo suíno em 3 diferentes estágios de desenvolvimento fetal (65, 85 e 111 dias) e 2 estágios de vida pós-natal, um compreendendo fase de maturação (5 meses) e outro de involução do órgão (2 anos), compreendendo um total de 25 animais, divididos em 5 grupos (n = 5). A análise da expressão relativa do mRNA do sistema VEGF-A, acessada por meio de PCR em tempo real, apresentou modificações tempo-dependentes significativas (P<0,05) em relação ao controle endógeno GAPDH. Também foram observadas diferenças significativas (P0,05) na quantificação vascular por meio de estereologia entre as idades. A imunolocalização da proteína do VEGF e de seus receptores Flt-1 e KDR foi identificada no timo de todos os grupos experimentais e variou entre os grupos pré e pós-natais, com expressão mais rara nestes últimos, o que sugere diferenças temporais na modulação do mRNA no órgão. Assim como as células endoteliais, as células epiteliais tímicas demonstraram modulação pelo sistema VEGF-A, indicando ação parácrina e/ou autócrina deste fator de crescimento no timo. Os valores das variáveis estereológicas Sv[m] e Vv[m] do timo fetal em período próximo ao nascimento mantiveram-se maiores do que no córtex e se correlacionaram positivamente com a expressão do mRNA do KDR e negativamente com a do Flt-1 até a idade adulta. Ao contrário da expressão protéica, a expressão gênica do sistema VEGF-A pode se correlacionar negativamente com aspectos quantitativos da vascularização do timo pós-natal, como observado para o mRNA do VEGF e seu receptor Flt-1 a partir dos 5 meses de idade, quando os valores das variáveis Vv[vasos,timo], Sv[vasos,timo] e Lv[vasos,timo] diminuíram significativamente (P0,05), o que sugere uma resposta de compensação ou manutenção de uma condição hipóxica instalada no órgão. / Crucial for maturation, differentiation and selection of T lymphocytes, the thymus is an essential organ to the development of immunity. In addition to its role in the maintenance of tissue integrity, thymus blood vessels play a role in migration of T-cell precursors into the organ, and show a typical architecture characterized by the presence of large blood vessels at the corticomedullary junction and fine network of branching vessels and anastomosing arcades extending into the cortex. The molecular basis of this typical vasculature and the exact mechanisms that trigger thymus involution are both not well understood. However, it has been shown that the interactions between thymus stroma, including vascular endothelium and the hematopoietic compartment play crucial roles for normal organ function. Thus, because VEGF is an essential angiogenic factor for induction of the vascular bed and modulation of functions directly related with vascularization, the aim of this study was to assess the temporal protein and mRNA expression of VEGF and its receptors Flt-1 and KDR in the thymus during early stages of its development and involution. Samples of thymus from 3 different stages of fetal development (65, 85, and 111 days) and 2 stages of postnatal life of pigs, including one stage of maturation (5 months) and another of involution (2 years) comprising a total of 25 animals that were divided into 5 groups (n = 5). Relative mRNA expression of VEGF-A system, accessed by real-time PCR, showed temporal significant changes (P<0.05) compared to endogenous control GAPDH. Quantification of blood vessels by means of stereology also showed significant differences (P0.05) between ages. Positive immunostaining for VEGF and its receptors Flt-1 and KDR was identified in the thymus of all groups and it varied between the pre and postnatal groups with rare expression in the latter, suggesting temporal differences in the modulation of mRNA. Endothelial and epithelial cells showed modulation by the VEGF-A system, suggesting paracrine or alternatively autocrine activity of this growth factor. The values of the stereological parameters Sv[m] and Vv[m] of the thymus in fetal period around the birth remained higher than in the cortex and upregulated with mRNA expression of KDR and downregulated with mRNA expression of Flt-1 until adulthood. Unlike protein expression, gene expression gene expression of VEGF-A system can be downregulated with quantitative aspects of the postnatal thymus vascularization as observed for the mRNA of VEGF and its receptor Flt-1 from the age of 5 months, when the values of the stereological parameters Vv[vessels,thymus], Sv[vessels,thymus] and Lv[vessels,thymus] decreased significantly (P0.05), which suggests a compensatory or maintenance response to an hypoxic condition in the organ.
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