Genetic variation in tropical Meloidogyne spp. as shown by RAPDs

La technique des RAPD a été utilisée pour évaluer la variabilité intra- et inter-spécifique chez des lignées de #Meloidogyne tropicaux. La reproductibilité de la technique a été évaluée ; pour chaque couple "amorce - ADN testé", l'ADN des différentes lignées de #Meloidogyne testées n'est pas en cause pour expliquer les différences de reproductibilité ; ce sont les amorces qui en sont responsables, certaines se révélant meilleures que d'autres en terme de reproductibilité des résultats et donc de fiabilité. #M. arenaria montre la variabilité intraspécifique la plus importante ; quelques amorces seulement suffisent à distinguer les espèces bien que les données produites par certaines d'entre elles révèlent plus de similitude entre certaines lignées de #M. arenaria et de #M. javanica qu'au sein même du groupe de lignées de #M. arenaria. Trois lignées virulentes de #M. arenaria peuvent être distinguées tant des autres lignées, non virulentes, de #M. arenaria que des autres lignées de #M. javanica, #M. incognita, #M. mayaguensis et #M. hapla. La comparaison des données obtenues sur le même jeu de lignées par RFLP et RAPD révèle des valeurs équivalentes en terme de différence interspécifique mais la technique des RAPD met en évidence une variation plus importante au niveau intraspécifique. (Résumé d'auteur

Oral Challenge with Trimethoprim-Sulfamethoxazole in Patients with “Sulfa” Antibiotic Allergy

Letter to the Edito

The potential effects of Community Hub for Smart Mobility (CHSM) on travel mode choice for accessing transit: a case study of Austin, TX

The Smart Mobility Hub is part of the Smart Cities movement of creating shared mobility in cities. These hubs allow access for e-mobility with e-scooters, e-bikes, and charging stations to provide micro-mobility to neighborhoods struggling with the first-mile problem of public transit accessibility. Access to modes other than cars can provide services to those without vehicle access and circumvent car dependency's negative externalities by providing a connection point within a community. The case study will focus on creating a base model for Austin's neighborhood, Georgian Acres. The base model will serve to study the hub in an underserved community. Studying the hub's impact could lead to more creation of these hubs within the Austin area to create a network of Smart Mobility Hubs. It is essential to understand the hub's impact on the neighborhood's mobility patterns and the ability to fulfill the goals of creating Smart Cities that focus on shared mobility, accessibility, and sustainability.Community and Regional Plannin

An RFLP study of relationships between species, populations and resistance-breaking lines of tropical species of Meloidogyne

Afin d'établir l'identité de certaines espèces de #Meloidogyne, caractérisées par le phénotype estérasique pVI et pouvant se développer sur certains cultivars résistants, six de ces lignées sont comparées par RFLP à dix lignées de #M. incognita, sept de #M. arenaria, quatre de #M. javanica, une de #M. hapla et une de #M. mayaguensis. Deux groupes très homogènes sont identifiés : le premier comprend les lignées de #M. incognita, le deuxième les lignées pVI et la lignée de #M. mayaguensis; un troisième, plus variable, regroupe les lignées appartenant à #M. arenaria et à #M. javanica. Les lignées se développant sur cultivars résistants et dotées du phénotype pVI apparaissent comme une espèce distincte, #M. mayaguensis$, et non comme la conséquence de la sélection, par l'usage de cultivars résistants, de variants parmi les espèces tropicales. (Résumé d'auteur

Supernovae as a probe of particle physics and cosmology

It has very recently been demonstrated by Csaki, Kaloper and Terning (CKT) that the faintness of supernovae at high redshift can be accommodated by mixing of a light axion with the photon in the presence of an intergalactic magnetic field, as opposed to the usual explanation of an accelerating universe by a dark energy component. In this paper we analyze further aspects of the CKT mechanism and its generalizations. The CKT mechanism also passes various cosmological constraints from the fluctuations of the CMB and the formation of structure at large scales, without requiring an accelerating phase in the expansion of the Universe. We investigate the statistical significance of current supernova data for pinning down the different components of the cosmological energy-momentum tensor and for probing physics beyond the standard models.Comment: 17 pages, LaTeX, 4 figures; v2: typos corrected, minor changes, references added; v3: updated figures, details regarding fits include

Soft-mode anisotropy in the negative thermal expansion material ReO3

We use a symmetry-motivated approach to analyse neutron pair distribution function data to investigate the character of the soft phonon modes in negative thermal expansion (NTE) material ReO3. This analysis shows that its local structure is dominated by an in-phase octahedral tilting mode and that the octahedral units are far less flexible to scissoring type deformations than in the related NTE compound ScF3. The lack of flexibility in ReO3 restricts the NTE-driving phonons to a smaller region of reciprocal space, limiting the magnitude and temperature range of NTE. These results support the idea that structural flexibility is an important factor in NTE materials. Surprisingly, our results show that the local fluctuations, even at elevated temperatures, respect the symmetry and order parameter direction of the initial pressure induced phase transition in ReO3. The result indicates that the dynamic motions associated with rigid unit modes are highly anisotropic in these systems

Tracing the evolution of nearby early-type galaxies in low density environments. The Ultraviolet view from GALEX

We detected recent star formation in nearby early-type galaxies located in low density environments, with GALEX Ultraviolet (UV) imaging. Signatures of star formation may be present in the nucleus and in outer rings/arm like structures. Our study suggests that such star formation may be induced by different triggering mechanisms, such as the inner secular evolution driven by bars, and minor accretion phenomena. We investigate the nature of the (FUV-NUV) color vs. Mg2 correlation, and suggest that it relates to "downsizing" in galaxy formation.Comment: Conference "UV Universe 2010" S. Petersburg 31 May - 3 June, 2010 Accepted for publication in Astrophysics & Space Science . The final publication is available at http://www.springerlink.co