Defective Vortex Lattices in Layered Superconductors with Point Pins at the Extreme Type-II Limit

The mixed phase of layered superconductors with no magnetic screening is studied through a partial duality analysis of the corresponding frustrated XY model in the presence of weak random point pins. Isolated layers exhibit a defective vortex lattice at low temperature that is phase coherent. Sufficiently weak Josephson coupling between adjacent layers results in an entangled vortex solid that exhibits weak superconductivity across layers. The corresponding vortex liquid state shows an inverted specific heat anomaly that we propose accounts for that seen in YBCO. A three-dimensional vortex lattice with dislocations occurs at stronger coupling. This crossover sheds light on the apparent discrepancy concerning the observation of a vortex-glass phase in recent Monte Carlo simulations of the same XY model.Comment: 4 pages, 1 figure. To appear in PRB, rapid communicatio

FDG-PET: a new diagnostic approach in hip prosthesis infection

Infection following hip arthroplasties can present a diagnostic challenge. No test is 100 % sensitive and 100 % specific; this prospective study was undertaken to evaluate the utility of FDG-PET imaging for diagnosing infected joint replacements. 24 hip joint replacements were studied prospectively and we have complete diagnoses with clinical signs and symptoms, laboratory test, radiography, joint aspiration, radionuclide imaging including FDG-PET, and histopathologic examination. 11 of 24 prostheses were infected. The sensitivity and specificity of PET for detecting infection associated with prostheses were 64,3 % and 64,7 % respectively, in our hands. FDG imaging is not useful in patients with suspected prosthetic infection like a screening tes

A Fungal Effector With Host Nuclear Localization and DNA-Binding Properties Is Required for Maize Anthracnose Development

Plant pathogens have the capacity to manipulate the host immune system through the secretion of effectors. We identified 27 putative effector proteins encoded in the genome of the maize anthracnose pathogen Colletotrichum graminicola that are likely to target the host’s nucleus, as they simultaneously contain sequence signatures for secretion and nuclear localization. We functionally characterized one protein, identified as CgEP1. This protein is synthesized during the early stages of disease development and is necessary for anthracnose development in maize leaves, stems, and roots. Genetic, molecular, and biochemical studies confirmed that this effector targets the host’s nucleus and defines a novel class of double-stranded DNA-binding protein. We show that CgEP1 arose from a gene duplication in an ancestor of a lineage of monocot-infecting Colletotrichum spp. and has undergone an intense evolution process, with evidence for episodes of positive selection. We detected CgEP1 homologs in several species of a grass-infecting lineage of Colletotrichum spp., suggesting that its function may be conserved across a large number of anthracnose pathogens. Our results demonstrate that effectors targeted to the host nucleus may be key elements for disease development and aid in the understanding of the genetic basis of anthracnose development in maize plants.Fil: Vargas, Walter Alberto. Universidad de Salamanca; España. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Sanz Martín, José M.. Universidad de Salamanca; EspañaFil: Rech, Gabriel E.. Universidad de Salamanca; EspañaFil: Armijos Jaramillo, Vinicio D.. Universidad de Salamanca; EspañaFil: Rivera Rodriguez, Lina Patricia. Universidad de Salamanca; EspañaFil: Echeverria, María de Las Mercedes. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; ArgentinaFil: Díaz Mínguez, José M.. Universidad de Salamanca; EspañaFil: Thon, Michael R.. Universidad de Salamanca; EspañaFil: Sukno, Serenella A.. Universidad de Salamanca; Españ

Tratamiento del síndrome antifosfolípido

The antiphospholipid syndrome (APS) is a disorder of recurrent thrombosis and/or pregnancy loss associated with the presence of antiphospholipid antibodies and persistently positive lupus anticoagulant, anticardiolipin or anti beta2-glycoprotein1. Oral anticoagulants are the best available and most effective treatment for the secondary prevention of recurrent venous or arterial thrombosis. Patients with APS are treated with long-term therapy to prolong the INR to 2.0-3.0. Low-molecular-weight heparin in combination with low-aspirin dose is a reasonable strategy to avoid pregnancy loss in women with this syndrome

Berezinskii-Kosterlitz-Thouless Transition in Spin-Charge Separated Superconductor

A model for spin-charge separated superconductivity in two dimensions is introduced where the phases of the spinon and holon order parameters couple gauge-invariantly to a statistical gauge-field representing chiral spin-fluctuations. The model is analyzed in the continuum limit and in the low-temperature limit. In both cases we find that physical electronic phase correlations show a superconducting-normal phase transition of the Berezinskii-Kosterlitz-Thouless type, while statistical gauge-field excitations are found to be strictly gapless. The normal-to-superconductor phase boundary for this model is also obtained as a function of carrier density, where we find that its shape compares favorably with that of the experimentally observed phase diagram for the oxide superconductors.Comment: 35 pages, TeX, CSLA-P-93-

Advancing a Transnational, Transdisciplinary and Translingual Professional Development Framework for Teaching Assistants in Writing and Spanish Programs: An Update

In 2018, we published a translingual and transdisciplinary collaborative piece that sought to respond to the call for writing and language programs to develop professional development opportunities central to multilingual writers’ needs as language learners and writers and their sophisticated and diverse language and writing abilities (Guerra, 2008; Horner et al., 2011; Kells, 2007; Tardy, 2017). We described the design, implementation, and implications of a multilingual pedagogy professional development series for teaching assistants in a transnational and multilingual context (Cavazos, et al., 2018). In this chapter, we provide an update on what has transpired since the series ended. We arrange the chapter as follows: first, we give a brief description of the institutional context where the workshops took place. Then we briefly describe the professional development series for readers unfamiliar with our first piece. After that, we provide an update on what happened after the series ended that emphasizes the impact, affordances, and challenges of implementing this type of workshop and how the authors continue to enact the core components of the proposed workshop in their disciplinary contexts and teaching practices

On property (Saw) and others spectral properties type Weyl-Browder theorems

An operator T acting on a Banach space X satisfies the property (aw) if σ(T) \ σw(T) = Ea(T), where σw(T) is the Weyl spectrum of T and Eo a(T) is the set of all eigenvalues of T of finite multiplicity that are isolated in the approximate point spectrum of T. In this paper we introduce and study two new spectral properties, namely (Saw) and (Sab), in connection with Weyl-Browder type theorems. Among other results, we prove that T satisfies property (Saw) if and only if T satisfies property (aw) and σSBF-+(T) = σw(T), where σSBF-+ (T) is the upper semi B-Weyl spectrum of T

Advancing a Transnational, Transdisciplinary and Translingual Framework: A Professional Development Series for Teaching Assistants in Writing and Spanish Programs

Considering the need for writing and language programs to develop translingual and transdisciplinary pedagogies for teacher development at the graduate level (Canagarajah, 2016; Williams & Rodrigue, 2016), the authors examine the design of a multilingual pedagogy professional development series for first-year Spanish and Writing teaching assistants (TAs). As designers of and participants in the series, the authors explore the benefits and challenges inherent in transdisciplinary and translingual conversations and discuss implications for teaching and research in language and writing instruction and teacher development. In order to advance transdisciplinary and translingual approaches as a new normal in composition studies (Tardy 2017; Horner, NeCamp, and Donahue 2011), the authors hope to provide a professional development framework that adapts to the linguistic realities of different institutional contexts and students’ lived language experiences