626 research outputs found
Turing patterns in multiplex networks
The theory of patterns formation for a reaction-diffusion system defined on a
multiplex is developed by means of a perturbative approach. The intra-layer
diffusion constants act as small parameter in the expansion and the unperturbed
state coincides with the limiting setting where the multiplex layers are
decoupled. The interaction between adjacent layers can seed the instability of
an homogeneous fixed point, yielding self-organized patterns which are instead
impeded in the limit of decoupled layers. Patterns on individual layers can
also fade away due to cross-talking between layers. Analytical results are
compared to direct simulations
Pattern formation for reactive species undergoing anisotropic diffusion
Turing instabilities for a two species reaction-diffusion systems is studied
under anisotropic diffusion. More specifically, the diffusion constants which
characterize the ability of the species to relocate in space are direction
sensitive. Under this working hypothesis, the conditions for the onset of the
instability are mathematically derived and numerically validated. Patterns
which closely resemble those obtained in the classical context of isotropic
diffusion, develop when the usual Turing condition is violated, along one of
the two accessible directions of migration. Remarkably, the instability can
also set in when the activator diffuses faster than the inhibitor, along the
direction for which the usual Turing conditions are not matched
Almost sure existence of global weak solutions for super-critical Navier-Stokes equations
In this paper we show that after suitable data randomization there exists a
large set of super-critical periodic initial data, in for some , for both 2d and 3d Navier-Stokes equations for
which global energy bounds are proved. As a consequence, we obtain almost sure
super-critical global weak solutions. We also show that in 2d these global weak
solutions are unique.Comment: 22 pages, a revised argument in Section 5, the cas
Structural and functional consequences of c-N-Ras constitutively associated with intact mitochondria
AbstractWe demonstrate that both c-N-Ras and c-K(B)-Ras are constitutively associated with purified mitochondria. c-K(B)-Ras is associated with the mitochondrial outer membrane, and c-N-Ras is associated with both the outer membrane and inner mitochondrial compartments. The mitochondrial morphology is abnormal in both c-N-Ras negative and K-Ras negative cells. Normal mitochondrial morphology was restored by targeting N-Ras to both the inner and outer mitochondrial compartments, or by ectopically expressing c-K(B)-Ras. Impaired mitochondrial function can result in increased CHOP and NFκB activity, typical for a retrograde signaling response. Both are constitutively elevated in the N-Ras negative cells, but not in the K-Ras negative background, and are restored by c-N-Ras targeted exclusively to the inner mitochondrial compartment. Surprisingly, both targeting and the ability to functionally reduce retrograde transcriptional activity were found to be independent of c-N-Ras farnesylation. Overall, these data demonstrate for the first time a (1) farnesylation independent function for c-N-Ras and (2) that N-Ras within the inner mitochondrial compartment is an essential component of the retrograde signaling system between the mitochondria and nucleus
Response of Photochemical Processes of Photosynthesis to Dinitrogen Fixation in Soybean
Fine properties of self-similar solutions of the Navier-Stokes equations
We study the solutions of the nonstationary incompressible Navier--Stokes
equations in , , of self-similar form , obtained from small and homogeneous initial
data . We construct an explicit asymptotic formula relating the
self-similar profile of the velocity field to its corresponding initial
datum
Maize IgE binding proteins: each plant a different profile?
Background: Allergies are nearly always triggered by protein molecules and the majority of individuals with documented
immunologic reactions to foods exhibit IgE hypersensitivity reactions. In this study we aimed to understand if natural
differences, at proteomic level, between maize populations, may induce different IgE binding proteins profiles among
maize-allergic individuals. We also intended to deepen our knowledge on maize IgE binding proteins.
Results: In order to accomplish this goal we have used proteomic tools (SDS-PAGE and 2-D gel electrophoresis followed
by western blot) and tested plasma IgE reactivity from four maize-allergic individuals against four different protein fractions
(albumins, globulins, glutelins and prolamins) of three different maize cultivars. We have observed that maize cultivars have
different proteomes that result in different IgE binding proteins profiles when tested against plasma from maize-allergic
individuals. We could identify 19 different maize IgE binding proteins, 11 of which were unknown to date. Moreover, we
found that most (89.5%) of the 19 identified potential maize allergens could be related to plant stress.
Conclusions: These results lead us to conclude that, within each species, plant allergenic potential varies with genotype.
Moreover, considering the stress-related IgE binding proteins identified, we hypothesise that the environment, particularly
stress conditions, may alter IgE binding protein profiles of plant components
Proteomic analysis of three Coffee Leaf Rust races with different pathogenic behavior
info:eu-repo/semantics/publishedVersio
- …