COLLECTIVE CATERING AND MICROBIOLOGICAL CONTROL: RESULT OF SURVEYINGS AT COOKING CENTRES DURING YEAR 2010

In this article was made up statistics on food samples collected in 2010 at cooking centers and analyzed for the presence of pathogenic or non-patogenic microorganisms. The results shows that most of the samples respects the limits imposed by reg. 2073/2005, due to the good manufacturing practices and application of HACCP

Design, construction, and beam tests of a rotatable collimator prototype for high-intensity and high-energy hadron accelerators

A rotatable-jaw collimator design was conceived as a solution to recover from catastrophic beam impacts which would damage a collimator at the Large Hadron Collider (LHC) or its High-Luminosity upgrade (HL-LHC). One such rotatable collimator prototype was designed and built at SLAC and delivered to CERN for tests with LHC-type circulating beams in the Super Proton Synchrotron (SPS). This was followed by destructive tests at the dedicated High Radiation to Materials (HiRadMat) facility to validate the design and rotation functionality. An overview of the collimator design, together with results from tests without and with beam are presented

Survival in amoeba: a major selection pressure on the presence of bacterial copper and zinc resistance determinants?: identification of a "copper pathogenicity island"

The presence of metal resistance determinants in bacteria usually is attributed to geological or anthropogenic metal contamination in different environments or associated with the use of antimicrobial metals in human healthcare or in agriculture. While this is certainly true, we hypothesize that protozoan predation and macrophage killing are also responsible for selection of copper/zinc resistance genes in bacteria. In this review, we outline evidence supporting this hypothesis, as well as highlight the correlation between metal resistance and pathogenicity in bacteria. In addition, we introduce and characterize the "copper pathogenicity island" identified in Escherichia coli and Salmonella strains isolated from copper- and zinc-fed Danish pigs

A simple, but efficient aeroacoustic model of jets

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TRICHINELLOSIS: INVESTIGATION AT THE SLAUGHTERHOUSE

Trichinellosis is a zoonosic disease veiculated by a parasite nematode genre trichinella. At slaughterhouse controls are executed on sample of striated muscle, sampled with one of the methods described in Regolamento CE 2075/05. During year 2009 were analyzed 2853 samples of muscle taken from a single slaughterhouse. The results, all negatives, confirm the literature data, according which the main sources of risk do not derive from animals raised in Italy but from import of animals or food from foreign countries

Network distance and centrality shape social learning in the classroom

Social learning can help individuals to efficiently acquire knowledge and skills. In the classroom, social learning often takes place in structured settings in which peers help, support, and tutor each other. Several protocols have been developed to make peer-assisted learning (PAL) more efficient. However, little attention has been devoted to how the transfer of knowledge is shaped by the social relationship between peers, and their relative positions in the social network. To address this gap, we combined social network analysis with an experimental social learning task, in which pupils (N = 135; aged 11–19) could use social information from their peers to improve their performance. We show that pupils’ tendencies to use social information substantially decrease with the peer’s distance in the social network. This effect is mediated by subjective closeness: pupils report feeling much closer to their friends than to their non-friends, and closeness strongly enhances social learning. Our results further show that, above and beyond these effects of network distance, social information use increases with the peer’s social status (network centrality) and perceived smartness. Our results provide empirical evidence in a naturalistic setting for the role of specific network attributes in shaping pupils’ willingness to learn from their peers. These findings illustrate the value of a social network approach for understanding knowledge transfer in the classroom and can be used to structure more effective peer learning.</p