78,990 research outputs found
Non trivial examples of coupled equations for K\"ahler metrics and Yang-Mills connections
We provide non trivial examples of solutions to the system of coupled
equations introduced by M. Garc\'ia-Fern\'andez for the uniformization problem
of a triple where is a holomorphic vector bundle over a polarized
complex manifold , generalizing the notions of both constant scalar
curvature K\"ahler metric and Hermitian-Einstein metric.Comment: 17 page
Infinite dimensional mixed economies with asymmetric information
In this paper, we study asymmetric information economies consisting of both
non-negligible and negligible agents and having ordered Banach spaces as their
commodity spaces. In answering a question of Herv\'{e}s-Beloso and
Moreno-Garc\'{i}a, we establish a characterization of Walrasian expectations
allocations by the veto power of the grand coalition. It is also shown that
when an economy contains only negligible agents a Vind's type theorem on the
private core with the exact feasibility can be restored. This solves a problem
of Pesce.Comment: 23 page
Dos especies de garrapatas del g\ue9nero Amblyomma (Acari: Ixodidae) en perros del estado Aragua, Venezuela
Manzanilla J, Garc\ueda ME, Moissant E, Garc\ueda FA, Tortolero E.
2002. Two species of ticks of the genus Amblyomma (Acari: Ixodidae) on
dogs of the Aragua state, Venezuela. Entomotropica 17(2):177-180. The
first report of Amblyomma maculatum and A. parvum collected from
Rottweiler and crossbred dogs, in Aragua state are presented. This is
the first report of A. parvum on dogs in Venezuela.Manzanilla J, Garc\ueda ME, Moissant E, Garc\ueda FA, Tortolero E.
2002. Dos especies de garrapatas del g\ue9nero Amblyomma (Acari:
Ixodidae) en perros del estado Aragua, Venezuela. Entomotropica
17(2):177-180. Se presenta el primer registro de Amblyomma maculatum
y A. parvum para el estado Aragua, sobre perros de la raza Rottweiler y
mestizo respectivamente. Es el primer registro de A. parvum sobre
caninos en Venezuel
Explicit lower and upper bounds on the entangled value of multiplayer XOR games
XOR games are the simplest model in which the nonlocal properties of
entanglement manifest themselves. When there are two players, it is well known
that the bias --- the maximum advantage over random play --- of entangled
players can be at most a constant times greater than that of classical players.
Recently, P\'{e}rez-Garc\'{i}a et al. [Comm. Math. Phys. 279 (2), 2008] showed
that no such bound holds when there are three or more players: the advantage of
entangled players over classical players can become unbounded, and scale with
the number of questions in the game. Their proof relies on non-trivial results
from operator space theory, and gives a non-explicit existence proof, leading
to a game with a very large number of questions and only a loose control over
the local dimension of the players' shared entanglement.
We give a new, simple and explicit (though still probabilistic) construction
of a family of three-player XOR games which achieve a large quantum-classical
gap (QC-gap). This QC-gap is exponentially larger than the one given by
P\'{e}rez-Garc\'{i}a et. al. in terms of the size of the game, achieving a
QC-gap of order with questions per player. In terms of the
dimension of the entangled state required, we achieve the same (optimal) QC-gap
of for a state of local dimension per player. Moreover, the
optimal entangled strategy is very simple, involving observables defined by
tensor products of the Pauli matrices.
Additionally, we give the first upper bound on the maximal QC-gap in terms of
the number of questions per player, showing that our construction is only
quadratically off in that respect. Our results rely on probabilistic estimates
on the norm of random matrices and higher-order tensors which may be of
independent interest.Comment: Major improvements in presentation; results identica
Keratinocytes from human skin respond as typical immune cells after the stimulation with _Trichophyton rubrum_
_Trichophyton rubrum_ is the main agent causing dermatophytosis (1). Keratinocytes are
considered to be the first physical barrier of defense against pathogens (2). But not
only a physical barrier. They recognize antigens through Toll like receptors (TLR) (3).
The activation of this TLR, present on the surface of the keratinocytes, induce the
expression of different pro-inflammatory cytokines, co-stimulatory molecules and
antimicrobial peptides such as [beta]-defensins (4).
The main objective of this work is to determine if lipopolysaccharides of G – bacteria
(LPS), lipotheichoic acid from G+ bacteria (LTA), and conidias, isolated from _T. rubrum_
were able to activate the expression of TLR2 and TLR6 on the cell surface of a primary
culture of human keratinocytes through Flow cytometry. Furthermore we are looking for
the presence of [beta]-defensins 1 and 2, IL-1b and IL-8 in the supernatant, of the above
mentioned culture of cells, by Western blot.
From the flow cytometry data, the preliminary results showed an important dispersion
in terms of proliferation, increase in size and granularity of keratinocytes, from primary
cultures of skin from healthy donors, stimulated 6 hours with conidias of _T. rubrum_, and
LTA, but not when non stimulated, or stimulated with LPS (Fig 1).
When keratinocytes from primary cultures of skin from healthy donors were cultivated
48 hours, it was found dispersion in terms of proliferation, increase in size and
granularity when stimulated with conidias of _T. rubrum_, and LPS but not when non
stimulated, or stimulated with LTA (Fig 2).
The keratinocytes expressed increased levels of TLR2 and TLR6 when were
stimulated with LTA and less to _T. rubrum_, in the 6 hours cultures, but this last cells still
showed increased size (Fig 3).
The Keratinocytes expressed increased levels of TLR2 in the 48 hours cultures when
were stimulated with LPS and _T. rubrum_.(Fig 4)
Besides, [beta]-defensin-2 was detected in the supernatant of cultures of keratinocytes
stimulated with LPS (Fig 5).
It can preliminary be concluded that keratinocytes from primary cultures of human skin from healthy donors, are cells that respond as typical immune cells, after stimulation
with _T. rubrum_, LTA and LPS in different conditions, and that this mechanism may be
very important, for the protection of local environment. 

References
1.- Arenas R., Dermatofitosis en México. Rev Iberoam Micol 2002; 19: 63-67.
2.- Kupper T. and Fuhlbrigge R. Immune surveillance in the skin: mechanims and clinical consecuences.
Nat Rev Immunol 2004; 4: 211-222
3.- Kôllish G., Naderi B., Voelcker V., Wallich R., Behrendt H., Ring J., Bauer S., Jacob T., Mempel M. and
Olelrt M. Various members of the Toll-Like receptor family contribute to the innate immune response of
human epidermal keratinocytes. Immunology 2005; 114: 531-541.
4.- Akira, S. and Takeda K. 2004. Toll-like Receptor Signalling. Nature Reviews Immunology 4:499-511
Locally projective monoidal model structure for complexes of quasi-coherent sheaves on P^1(k)
We will generalize the projective model structure in the category of
unbounded complexes of modules over a commutative ring to the category of
unbounded complexes of quasi-coherent sheaves over the projective line.
Concretely we will define a locally projective model structure in the category
of complexes of quasi-coherent sheaves on the projective line. In this model
structure the cofibrant objects are the dg-locally projective complexes. We
also describe the fibrations of this model structure and show that the model
structure is monoidal. We point out that this model structure is necessarily
different from other known model structures such as the injective model
structure and the locally free model structure
La nuova disciplina del lavoro a tempo parziale e del lavoro a termine in Spagna
Nota al testo della legge. SOMMARIO: 1. Nota introduttiva di Carmen Agut Garc\ueda e Michele Tiraboschi. \u2013 2. Allegato. Real Decreto Ley n. 5/2001 del 2 marzo 2001, de 2 de marzo, de medidas urgentes de reforma del mercado de trabajo para el incremento del empleo y la mejora de su calidad
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