Invariant Surfaces
Mostrando 13-23 de 23 artigos, teses e dissertações.
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13. Aplicações harmonicas, estruturas-f, toros e superficies de Riemann nas variedades homogeneas
In this work we study the geometry of invariant f-structures and f-holomorphic curves on flag manifolds, and the construction of the equiharmonic tori on full complex flag manifolds which are not f-holomophic for any invariant f-estructure. Moreover we relate the tournament theory with the almost-complex on a flag manifolds. We compute the second variation o
Publicado em: 2002
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14. Surfaces in E³ invariant under a one parameter group of isometries of E³
We develop a convenient surface theory in E³ in order to apply it to the class of the surfaces invariant under a one-parameter group of isometries of E³. In this way we derive intrinsic characterizations along with several results of subclasses of this class of surfaces that satisfy certain preassigned properties. In the process all results are also effort
Anais da Academia Brasileira de Ciências. Publicado em: 2000-06
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15. Metodos numericos aplicados a escoamento rotativo de gases
A numerical method to solve the linearized, steady state, axisymmetric equations of motion of a secondary flow of a gas within a rotating cylinder is presented. The boundary conditions at the solid surfaces are decomposed into symmetric and antisymmetric cases. Due to certain invariant; properties, new boundary conditions for both cases are developed at the
Publicado em: 1983
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16. Estudo de monocromadores assimetricos de raios-X
Asymmetric X-ray monochromators, firsts introduced by I. Fankuchen ( 1937 ) with the purpose of concentrating an X-ray beam have been the subject of numerous investigations. Evans, Hirsch and Kellar as early as 1948, based ther well known and hitherto unchallenged study on the hypothetic existence of a non-ref1ecting surface layer with an absorption coeffici
Publicado em: 1979
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17. CONFORMALLY INVARIANT METRICS ON RIEMANN SURFACES*
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18. Reduction of scattering to an invariant finite displacement in an ambient space-time
The scattering transformation S for a wave equation in Minkowski space M0 is reducible (rigorously in the classical case, necessarily partially heuristically in the nonlinear quantum case) to the action of a distinguished finite transformation ζ in the ambient universal cosmos M. M0 is invariantly imbedded in M, relative to any given point of observation, a
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19. Report on the Teichmüller Metric*
Let Tg be the Teichmüller space of compact Riemann surfaces of genus g. Then Tg is the space of conformal structures on a fixed surface W modulo equivalence under conformal maps homotopic to the identity. The Teichmüller modular group [unk] is the group of all orientation preserving homeomorphisms of W onto itself modulo those which are homotopic to the id
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20. Crystal structure of prokaryotic ribosomal protein L9: a bi-lobed RNA-binding protein.
The crystal structure of protein L9 from the Bacillus stearothermophilus ribosome has been determined at 2.8 A resolution using X-ray diffraction methods. This primary RNA-binding protein has a highly elongated and unusual structure consisting of two separated domains joined by a long exposed alpha-helix. Conserved, positively charged and aromatic amino acid
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21. Cathepsin S activity regulates antigen presentation and immunity.
MHC class II molecules display antigenic peptides on cell surfaces for recognition by CD4(+) T cells. Proteolysis is required in this process both for degradation of invariant chain (Ii) from class II-Ii complexes to allow subsequent binding of peptides, and for generation of the antigenic peptides. The cysteine endoprotease, cathepsin S, mediates Ii degrada
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22. Enhancing the Activity of a Protein by Stereospecific Unfolding: CONFORMATIONAL LIFE CYCLE OF INSULIN AND ITS EVOLUTIONARY ORIGINS*S⃞♦
A central tenet of molecular biology holds that the function of a protein is mediated by its structure. An inactive ground-state conformation may nonetheless be enjoined by the interplay of competing biological constraints. A model is provided by insulin, well characterized at atomic resolution by x-ray crystallography. Here, we demonstrate that the acti
American Society for Biochemistry and Molecular Biology.
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23. Antibody Recognition of Rodent Malaria Parasite Antigens Exposed at the Infected Erythrocyte Surface: Specificity of Immunity Generated in Hyperimmune Mice
In regions where malaria is endemic, inhabitants remain susceptible to repeated reinfection as they develop and maintain clinical immunity. This immunity includes responses to surface-exposed antigens on Plasmodium sp.-infected erythrocytes. Some of these parasite-encoded antigens may be diverse and phenotypically variable, and the ability to respond to this
American Society for Microbiology.