122 research outputs found
Chemical Secretory Pathway Modulation in Plant Protoplasts
No full textthe classical Golgi pathway is not the only mechanism for vacuolar protein transport in plants because alternative transport mechanisms have been described. The existence of these alternative pathways can be demonstrated using several chemicals and here we describe the use of brefeldin A (BFA), endo-β-N-acetylglucosaminidase H (Endo-H), and tunicamycin, on isolated tobacco leaf protoplasts. Two main methods are illustrated in this chapter, protoplast pulse-chase followed by protein immunoprecipitation, and protoplast immunofluorescence
Multiplicity of solutions for a mean field equation on compact surfaces
No full textWe consider a scalar field equation on compact surfaces which have variational structure. When the surface is a torus and a physical parameter \rho belongs to (8\pi,4\pi^2), we show under some extra assumptions that, as conjectured in [De Marchis, Comm. PDE 2008], the functional admits at least three saddle points other than a local minimum
n the Ambjorn-Olesen electroweak condensates
No full textWe obtain sufficient conditions for the existence of the Ambjorn-Olesen [“On elec-
troweak magnetism,” Nucl. Phys. B315, 606–614 (1989)] electroweak N-vortices
in case N ≥ 1 and therefore generalize earlier results [D. Bartolucci and G. Taran-
tello, “Liouville type equations with singular data and their applications to periodic
multivortices for the electroweak theory,” Commun. Math. Phys. 229, 3–47 (2002);
J. Spruck and Y. Yang, “On multivortices in the electroweak theory I: Existence of
periodic solutions,” ibid. 144, 1–16 (1992)] which handled the cases N ∈ {1, 2, 3,
4}. The variational argument provided here has its own independent interest as it
generalizes the one adopted by Ding et al. [“Existence results for mean field equa-
tions,” Ann. Inst. Henri Poincare, Anal. Non Lineaire 16, 653–666 (1999)] to obtain
solutions for Liouville-type equations on closed 2-manifolds. In fact, we obtain at
once a second proof of the existence of supercritical conformal metrics on surfaces
with conical singularities and prescribed Gaussian curvature recently established by
Bartolucci, De Marchis and Malchiodi [Int. Math. Res. Not. 24, 5625–5643 (2011)].
C 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4731239
Generic multiplicity for a scalar field equation on compact surfaces
No full textWe prove generic multiplicity of solutions for a scalar field equation on compact surfaces via Morse inequalities. In particular our result improves significantly the multiplicity estimate which can be deduced from the degree-counting formula in Chen and Lin (doi:10.1002/cpa.10107). Related results are derived for the prescribed Q-curvature equatio
Multiplicity Result for a Scalar Field Equation on Compact Surfaces
No full textWe consider a scalar field equation on compact surfaces which has variational structure. When the surface is a torus and a physical parameter belongs to (8\pi,4\pi^2) we show under some extra assumptions that, besides a local minimum, the functional admits at least other two saddle points
Entrevista com Giorgio De Marchis e Gian Luigi De Rosa: tradução al di là dell’oceano
No full textNós, da Cadernos de Literatura em Tradução, decidimos apresentar uma entrevista que passa pelo caminho inverso, ou no contrafluxo do caminho ‘de/ para’ comumente tomado nas entrevistas feitas com tradutores. Nesta edição, convidamos os professores e tradutores italianos Giorgio De Marchis e Gian Luigi De Rosa para conversarem conosco sobre sua experiência na tradução do português para o italiano. Colhemos o momento do lançamento do livro de ensaios de Haroldo de Campos Traduzione, Transcreazione Saggi pela editora Oèdipus, na Itália, volume organizado por Andrea Lombardi e traduzido por ele junto a Gaetano D’Itria, para conversar com nossos entrevistados também sobre o legado de Haroldo al di là dell’oceano. Para De Marchis, a obra de Haroldo é um autêntico desafio hermenêutico ao qual se deve retornar periodicamente. Já De Rosa nos lembra que através de Haroldo percebe-se que a tradução não é somente a “transposição” de signos verbais, mas também a passagem de uma língua-cultura para outra
Existence of stationary turbulent flows with variable positive vortex intensity
No full textWe prove the existence of stationary turbulent flows with arbitrary positive vortex
circulation on non-simply connected domains. Our construction yields solutions for
all real values of the inverse temperature with the exception of a quantized set, for
which blow-up phenomena may occur. Our results complete the analysis initiated
in Ricciardi and Zecca (2016)
Supercritical Mean Field Equations on convex domains and the Onsager's statistical description of two-dimensional turbulence
No full textWe are motivated by the study of the Microcanonical Variational Principle within the Onsager's
description of two-dimensional turbulence in the range of energies where the equivalence of statistical ensembles fails.
We obtain sufficient conditions for the existence and multiplicity of solutions for the corresponding Mean Field
Equation on convex and "thin" enough domains in the supercritical (with respect to the Moser-Trudinger inequality) regime.
This is a brand new achievement since existence results in the supercritical region were previously known
{only} on multiply connected domains.
Then we study the structure of these solutions by the analysis of their linearized problems
and we also obtain a new uniqueness result for solutions of the Mean Field Equation on thin domains whose
energy is uniformly bounded from above. Finally we evaluate the asymptotic expansion of those solutions with respect
to the thinning parameter
and, combining it with all the results obtained so far, we solve the Microcanonical Variational Principle in a small
range of supercritical energies where the entropy is shown to be concave
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