Suitability of the nisin Z-producer lactococcus lactis subsp. lactis CBM 21 to be used as an adjunct culture for squacquerone cheese production

This research investigated the technological and safety effects of the nisin Z producer Lactococcus lactis subsp. lactis CBM 21, tested as an adjunct culture for the making of Squacquerone cheese in a pilot-scale plant. The biocontrol agent remained at a high level throughout the cheese refrigerated storage, without having a negative influence on the viability of the conventional Streptococcus thermophilus starter. The inclusion of CBM 21 in Squacquerone cheesemaking proved to be more effective compared to the traditional one, to reduce total coliforms and Pseudomonas spp. Moreover, the novel/innovative adjunct culture tested did not negatively modify the proteolytic patterns of Squacquerone cheese, but it gave rise to products with specific volatile and texture profiles. The cheese produced with CBM 21 was more appreciated by the panelists with respect to the traditional one

Voces del relato histórico : La enseñanza de la Historia desde una mirada social

Este libro se gestó a la sombra de un gran interrogante que atraviesa nuestro trabajo en el aula, puntualmente ¿cómo proporcionar a los/as estudiantes textos que sin dejar de ser rigurosos y académicos faciliten la comprensión de la Historia, Historia del Arte y Geografía? Fue en esa dirección que asumimos este desafío, ahora plasmado en su escritura, con el objetivo de generar una producción académica, pero mediada, para optimizar el acceso y la lectura de los/as estudiantes en la dinámica del proceso de enseñanza y aprendizaje. Los trabajos que integran esta producción se inscriben en una línea que persigue aunar criterios metodológicos y didácticos, propugnando el fortalecimiento de los equipos docentes en función de la enseñanza de las Ciencias Sociales en el ámbito del Bachillerato de Bellas Artes. La escritura de los capítulos adhiere a una perspectiva de abordaje del pasado descentrada de los lineamientos de la “historia única”, narrativa en torno a la cual se han solidificado determinadas memorias silenciándose otras, alternativas o discrepantes. La novelista nigeriana Chimamanda Ngozi Adichie, en su brillante conferencia titulada The dangers of a single story (2010) pone la mirada en el poder y en el rol que este ha desempeñado en la elaboración de las versiones sobre el pasado. En suma, del poder depende quiénes son los que cuentan, cómo se cuenta, cuánto se cuenta, “es la habilidad no sólo de contar la historia del otro, sino de hacer que esa sea la historia definitiva”. Por lo general, se trata de “una historia lineal y estatista, que nos impide ver que en cada momento del pasado ha existido una diversidad de futuros posibles” (Fontana, 2003, 17), que fueron proyectos alternativos que no lograron sus fines y quedaron subsumidos bajo la versión que finalmente se impuso. En esa trama, los sujetos sociales en los que se pone el foco de atención son siempre las personas “relevantes” que pertenecen a los grupos dominantes, por lo tanto, el relato histórico toma distancia de los hombres y mujeres comunes, personas de carne y hueso que también contribuyen a moldear el microcosmos del cual formaron parte.Bachillerato de Bellas Artes "Prof. Francisco A. De Santo

Testing and integrating the WLCG/EGEE middleware in the LHC computing

The main goal of the Experiment Integration and Support (EIS) team in WLCG is to help the LHC experiments with using proficiently the gLite middleware as part of their computing framework. This contribution gives an overview of the activities of the EIS team, and focuses on a few of them particularly important for the experiments. One activity is the evaluation of the gLite workload management system (WMS) to assess its adequacy for the needs of the LHC computing in terms of functionality, reliability and scalability. We describe in detail how the experiment requirements can be mapped to validation criteria, and the WMS performances are accurately measured under realistic load conditions over prolonged periods of time. Another activity is the integration of the Service Availability Monitoring system (SAM) with the experiment monitoring framework. The SAM system is widely used in the EGEE operations to identify malfunctions in Grid services, but it can be adapted to perform the same function on experiment-specific services. We describe how this has been done for some LHC experiments, which are now using SAM as part of their operations

The AMS-02 RICH Imager Prototype - In-Beam Tests with 20 GeV/c per Nucleon Ions -

A prototype of the AMS Cherenkov imager (RICH) has been tested at CERN by means of a low intensity 20 GeV/c per nucleon ion beam obtained by fragmentation of a primary beam of Pb ions. Data have been collected with a single beam setting, over the range of nuclear charges 2<Z<~45 in various beam conditions and using different radiators. The charge Z and velocity beta resolutions have been measured.Comment: 4 pages, contribution to the ICRC 200

The Ring Imaging Cherenkov detector (RICH) of the AMS experiment

The Alpha Magnetic Spectrometer (AMS) experiment to be installed on the International Space Station (ISS) will be equipped with a proximity focusing Ring Imaging Cherenkov (RICH) detector for measuring the electric charge and velocity of the charged cosmic particles. A RICH prototype consisting of 96 photomultiplier units, including a piece of the conical reflector, was built and its performance evaluated with ion beam data. Preliminary results of the in-beam tests performed with ion fragments resulting from collisions of a 158 GeV/c/nuc primary beam of Indium ions (CERN SPS) on a Pb target are reported. The collected data included tests to the final front-end electronics and to different aerogel radiators. Cherenkov rings for a large range of charged nuclei and with reflected photons were observed. The data analysis confirms the design goals. Charge separation up to Fe and velocity resolution of the order of 0.1% for singly charged particles are obtained.Comment: 29th International Conference on Cosmic Rays (Pune, India

The AMS-RICH velocity and charge reconstruction

The AMS detector, to be installed on the International Space Station, includes a Ring Imaging Cerenkov detector with two different radiators, silica aerogel (n=1.05) and sodium fluoride (n=1.334). This detector is designed to provide very precise measurements of velocity and electric charge in a wide range of cosmic nuclei energies and atomic numbers. The detector geometry, in particular the presence of a reflector for acceptance purposes, leads to complex Cerenkov patterns detected in a pixelized photomultiplier matrix. The results of different reconstruction methods applied to test beam data as well as to simulated samples are presented. To ensure nominal performances throughout the flight, several detector parameters have to be carefully monitored. The algorithms developed to fulfill these requirements are presented. The velocity and charge measurements provided by the RICH detector endow the AMS spectrometer with precise particle identification capabilities in a wide energy range. The expected performances on light isotope separation are discussed.Comment: Contribution to the ICRC07, Merida, Mexico (2007); Presenter: F. Bara

Generation of aroma compounds in sourdough: Effects of stress exposure and lactobacilli-yeasts interactions

Abstract The effects of the interaction between Saccharomyces cerevisiae LBS and Lactobacillus sanfranciscensis LSCE1 and of their responses to acid, oxidative or osmotic stress on alcohol and aroma production were assessed. The exposure of S. cerevisiae LBS and L. sanfranciscensis LSCE1 cells to oxidative, acid or osmotic sub-lethal stress gave rise to a common or specific responses. g-decalactone, 2(5H)-furanones and aldehydes were overproduced by LAB following oxidative stress. The acid stress induced both in yeasts and LAB, as well as in their co-cultures, a relevant accumulation of isovaleric and acetic acids and higher alcohols. A cross-exposure of yeasts and LAB to their preconditioned media, generated in S. cerevisiae a release of esters including esters of long-chain unsaturated fatty acids coming from membrane phospholipids. These esters were excreted also by yeasts following a pressure stress.