582 documentos corresponden a la consulta.
Palabras contadas: article: 597
Giudice, J. - Leskow, F.C. - Arndt-Jovin, D.J. - Jovin, T.M. - Jares-Erijman, E.
J. Cell Sci. 2012;125(11):2786
2012
Descripción: Fil:Giudice, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
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Zorreguieta, A. - Ugalde, R.A.
J. BACTERIOL. 1986;167(3):947-951
1986
Temas: beta 1,2 glucan - polysaccharide - protein - unclassified drug - article - nonhuman - Rhizobium - Agrobacterium - Rhizobium
Descripción: Fil:Zorreguieta, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
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García-Patrone, M. - González, N.S. - Algranati, I.D.
FEBS Lett. 1972;24(1):126-130
1972
Temas: sucrose - article - binding site - cytology - density gradient centrifugation - drug effect - Escherichia coli - gel chromatography - protein binding - ribosome
Descripción: Fil:González, N.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
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Forzani, L. - Maldonado, D.
J. Math. Anal. Appl. 2002;275(2):721-732
2002
Temas: Doubling measures - Monge-Ampère measure - Real Monge-Ampère equation - Sections of convex functions - Spaces of homogeneous type
Descripción: In this article we prove a theorem on the size of the image of sections of a convex function under its normal mapping when the sections satisfy a geometric property. We apply this result to get new geometric characterizations for Monge-Ampère doubling measures. © 2002 Elsevier Science (USA). All rights reserved.
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Téllez-Iñón, M.T. - Terenzi, H. - Torres, H.N.
BBA - Enzymology 1969;191(3):765-768
1969
Temas: adenosine triphosphate - carbon - glucosyltransferase - glycogen - hexose phosphate - magnesium - nucleotidyltransferase - pyrimidine nucleotide - sorbose - sucrose
Descripción: Fil:Torres, H.N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
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Mola, L.M.
Hereditas 1995;122(1):47-55
1995
Temas: animal cell - article - chromosome bivalent - chromosome pairing - insect - male - meiosis - nonhuman - spermatogonium
Descripción: In many groups of insects with holokinetic chromosomes the meiotic process is, without doubt, either pre‐reductional or post‐reductional. In Odonata, however, the mode of orientation (axial or equatorial) and type of meiosis (pre‐ or post‐reductional) of bivalents is still controversial. Copyright © 1995, Wiley Blackwell. All rights reserved
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Lozano, G.S. - Moreno, E.F. - Schaposnik, F.A.
Phys Lett Sect B Nucl Elem Part High-Energy Phys 2001;504(1-2):117-121
2001
Temas: article - calculation - energy - model - particle radiation - quantum theory - radiation field - radiation physics
Descripción: We construct an exact regular vortex solution to the self-dual equations of the Abelian Higgs model in noncommutative space for arbitrary values of θ. To this end, we propose an ansatz which is the analogous, in Fock space, to the one leading to exact solutions for the Nielsen-Olesen vortex in commutative space. We compute the flux and energy of the solution and discuss its relevant properties. © 2001 Published by Elsevier Science B.V.
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Ledesma, D.S. - Bellini, M.
Phys Lett Sect B Nucl Elem Part High-Energy Phys 2004;581(1-2):1-8
2004
Temas: article - cosmos - evolution - Kaluza Klein theory - model - surface property - theoretical model
Descripción: We discuss a semiclassical treatment to inflationary models from Kaluza-Klein theory without the cylinder condition. We conclude that the evolution of the early universe could be described by a geodesic trajectory of a cosmological 5D metric here proposed, so that the effective 4D FRW background metric should be a hypersurface on a constant fifth dimension. © 2003 Elsevier B.V. All rights reserved.
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de Xifra, E.A.W. - Mendiara, S. - del C. Batlle, A.M.
FEBS Lett. 1972;27(2):275-278
1972
Temas: adenosine triphosphate - long chain fatty acid coenzyme A ligase - polysaccharide - succinic acid derivative - affinity chromatography - article - binding site - enzymology - kinetics - macromolecule
Descripción: Fil:del C. Batlle, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
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Cox, D. - Dickenstein, A.
Proc. Am. Math. Soc. 2005;133(11):3153-3162
2005
Temas: Toric variety
Descripción: Let X be a complete toric variety with homogeneous coordinate ring S. In this article, we compute upper and lower bounds for the codimension in the critical degree of ideals of S generated by dim(X) + 1 homogeneous polynomials that do not vanish simultaneously on X. ©2005 American Mathematical Society.
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Fraiman, D. - Pando, B. - Dargan, S. - Parker, I. - Dawson, S.P.
Biophys. J. 2006;90(11):3897-3907
2006
Temas: 1,4,5 triphosphate - calcium - phosphate - unclassified drug - animal cell - article - controlled study - dynamics - endoplasmic reticulum - fluorescence
Descripción: Puffs are localized Ca2+ signals that arise in oocytes in response to inositol 1,4,5-trisphosphate (IP3). They are analogous to the sparks of myocytes and are believed to be the result of the liberation of Ca2+ from the endoplasmic reticulum through the coordinated opening of IP3 receptor/channels clustered at a functional release site. In this article, we analyze sequences of puffs that occur at the same site to help elucidate the mechanisms underlying puff dynamics. In particular, we show a dependence of the interpuff time on the amplitude of the preceding puff, and of the amplitude of the following puff on the preceding interval. These relationships can be accounted for by an inhibitory role of the Ca2+ that is liberated during puffs. We construct a stochastic model for a cluster of IP3 receptor/channels that quantitatively replicates the observed behavior, and we determine that the characteristic time for a channel to escape from the inhibitory state is of the order of seconds. © 2006 by the Biophysical Society.
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Anastasio, M. - Cabrelli, C. - Paternostro, V.
J. Math. Anal. Appl. 2010;370(2):530-537
2010
Temas: Fiber spaces - LCA groups - Range functions - Shift-invariant space - Translation invariant space
Descripción: This article generalizes recent results in the extra invariance for shift-invariant spaces to the context of LCA groups. Let G be a locally compact abelian (LCA) group and K a closed subgroup of G. A closed subspace of L2(G) is called K-invariant if it is invariant under translations by elements of K. Assume now that H is a countable uniform lattice in G and M is any closed subgroup of G containing H. In this article we study necessary and sufficient conditions for an H-invariant space to be M-invariant. As a consequence of our results we prove that for each closed subgroup M of G containing the lattice H, there exists an H-invariant space S that is exactly M-invariant. That is, S is not invariant under any other subgroup M' containing H. We also obtain estimates on the support of the Fourier transform of the generators of the H-invariant space, related to its M-invariance. © 2010 Elsevier Inc.
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Cueto, P.H. - Mendez, B.S.
APPL. ENVIRON. MICROBIOL. 1990;56(2):578-580
1990
Temas: acetic acid - bromate - bromide - solvent - article - bacterium mutant - clostridium acetobutylicum - fermentation - methodology - nonhuman
Descripción: Clostridium acetobutylicum ATCC 10132 mutants altered in acetic acid synthesis or in the shift to solventogenesis were directly selected by a proton suicide method after mutagenic treatment, by using bromide and bromate as selective agents. The mutants were characterized according to their solvent and acid production. On the selection plates they differed in colony phenotype from the parent strain.
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Herscovich, E. - Solotar, A.
J. Algebra 2007;315(2):852-873
2007
Descripción: In this article we prove derived invariance of Hochschild-Mitchell homology and cohomology and we extend to k-linear categories a result by Barot and Lenzing concerning derived equivalences and one-point extensions. We also prove the existence of a long exact sequence à la Happel and we give a generalization of this result which provides an alternative approach. © 2007 Elsevier Inc. All rights reserved.
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Chelala, C.A. - Torres, H.N.
BBA - Enzymology 1969;178(2):423-426
1969
Temas: adenine nucleotide - adenosine triphosphate - creatine phosphate - cyclic AMP - glucosyltransferase - glycogen - magnesium - mercaptoethanol - phosphatase - theophylline
Descripción: Fil:Chelala, C.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
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Schweigmann, N. - Pietrokovsky, S. - Conti, O. - Escosteguy, M. - Bottazzi, V. - Solarz, N. - Wisnivesky-Colli, C.
Mem. Inst. Oswaldo Cruz 1997;92(2):151-152
1997
Temas: animal - animal disease - Argentina - article - Chagas disease - comparative study - male - opossum - parasitology - prevalence
Descripción: Fil:Schweigmann, N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
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Matuk Herrera, R.
Lect. Notes Comput. Sci. 2012;7441 LNCS:543-550
2012
Temas: Gradual changes - Hierarchical architectures - Lateral geniculate nucleus - Natural environments - Ring-shaped pattern - Visual-processing - Image analysis - Computer vision
Descripción: In this article, the performance of hierarchical architectures for computer vision of biological inspiration is analyzed. In particular, the role of the lateral geniculate nucleus (LGN) for the robustness in the recognition of ring shaped patterns under gradual changes in illumination was analyzed. Changes in illumination are common in everyday environments and thus, it is a crucial factor to be considered for the recognition of objects in everyday environments. © 2012 Springer-Verlag.
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Gros, E.G. - Deulofeu, V. - Galmarini, O.L. - Frydman, B.
Experientia 1968;24(4):323-324
1968
Temas: antibiotic agent - glycoside - hexose - hydrazone derivative - article - chemistry - nuclear magnetic resonance spectroscopy - stereoisomerism - Antibiotics - Chemistry, Pharmaceutical
Descripción: Fil:Gros, E.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
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Cortina, E.
J. Math. Anal. Appl. 1983;92(2):435-444
1983
Descripción: We obtain in this article theorems on linear fractional transformations of j-expansive matrix-valued functions wich provide a procedure to synthetize linear passive 2n-ports. In particular, these results permit us to solve the problem of Darlington realizations of transfer-scattering matrices of linear passive 2n-ports on the basis of the synthesis of transfer-scattering matrices of linear 4n-ports without losses. It is a pleasure to acknowledge our debt to the remarkable paper [4] by Arov. © 1983.
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Correa, D.H. - Lozano, G. - Moreno, E.F. - Schaposnik, F.A.
Phys Lett Sect B Nucl Elem Part High-Energy Phys 2001;515(1-2):206-212
2001
Temas: article - calculation - cosmological phenomena - elementary particle - mathematical analysis - space - theory - time
Descripción: We discuss the 't Hoof ansatz for instanton solutions in noncommutative U (2) Yang-Mills theory. We show that the extension of the ansatz leading to singular solutions in the commutative case, yields to non self-dual (or self-antidual) configurations in noncommutative space-time. A proposal leading to selfdual solutions with Q = 1 topological charge (the equivalent of the regular BPST ansatz) can be engineered, but in that case the gauge field and the curvature are not Hermitian (although the resulting Lagrangian is real). © 2001 Published by Elsevier Science B.V.
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