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- Genotypic and phenotypic characterization of staphylococcus aureus in children from Northern PortugalPublication . Silva, J.; Smicht, H.; Lopo, N.; Castro, A.; Teixeira, P.
- Effet de la souche de levure sur les proprietes organoleptiques des vins issus de cinq cepages blancs portugaisPublication . Vasconcelos, I.; Moura, F.; Martins, M. C. P.; Herdeiro, M. T.; Pereira, O.; Castro, A.; Revel, G. deNeuf souches de levures commerciales, appartenant au genre Saccharomyces (six souches de S. cerevisiae et trois souches de S. bayanus), ont ete testees lors de la fermentation de moths issus de cinq cepages portugais: Loureiro, Trajadura, Pedernk Azal e Avesso. Pour un même cepage la levure d'implantation semble ne pas avoir d'influence sur la teneur en alcool et sur l'acidité totale des vins produits. Les variations des quantites produites en esters ethyliques d'acides gras (BRAG) et acetates d'alcools superieurs (AAS) peuvent varier d'un facteur 2.1 et 4.3 respectivement, pour un même cepages les teneurs maximales en AAS sont observêes avec les deux mêmes souches pour tour les cepages, a une exception pres. En ce qui concerne les alcools superieurs, les souches plus ou moths productrices different pour chaque cépage. Une etude statistique a permis d'etablir une correlation entre l'analyse chimique et l'analyse sensorielle. D'un point de vue organoleptique, les vins prefer-es sont riches en acides gras et en EEAG mais relativement pauvres en AAS.
- Genotypic and phenotypic characterization of staphylococcus aureus in children from Northern PortugalPublication . Silva, J.; Smicht, H.; Lopo, N.; Castro, A.; Teixeira, P.
- Listeria: is it a problem?Publication . Barbosa, J.; Ferreira, V.; Albano, H.; Magalhães, R.; Santos, I.; Castro, A.; Silva, J.; Almeida, G.; Teixeira, P.
- Stress response of Listeria monocytogenes to a lethal stress after a pre-exposure to sublethal conditionsPublication . Carvalheira, A.; Castro, A.; Silva, J.; Teixeira, P.
- Effet de la souche de levure sur les proprietes organoleptiques des vins issus de cinq cepages blancs portugaisPublication . Vasconcelos, I.; Moura, F.; Martins, M. C. P.; Herdeiro, M. T.; Pereira, O.; Castro, A.; Revel, G. de
- Characterization for enterotoxin production, virulence factors, and antibiotic susceptibility of Staphylococcus aureus isolates from various foods in PortugalPublication . Pereira, V.; Lopes, C.; Castro, A.; Silva, J.; Gibbs, P.; Teixeira, P.Staphylococcus aureus represents a public health challenge worldwide. The aim of this study was the characterization of different food isolates of S. aureus on the basis of their production of enterotoxins, hemolysins and resistance to antibiotics. A total of 148 coagulase-positive staphylococcal strains isolated from different food origins were identified to the species level. By multiplex PCR, 69% of the isolates were shown to be enterotoxigenic (SEs); the most common were sea seg, sea seg sei and seg sei. According to CLSI [CLSI, Clinical and Laboratory Standards Institute, 2007. Performance Standards for Antimicrobial Susceptibility Testing; Fifteenth Informational Supplement. CLSI document M100-S15. Clinical and Laboratory Standards Institute, Wayne, PA], 38% of the isolates were resistant to oxacillin ( 6 mg/mL; MRSA positives) but only 0.68% showed the presence of mecA gene. 70 and 73% of the S. aureus strains were resistant to b-lactams, ampicillin and penicillin, respectively. The virulence pattern was demonstrated to be origin and strain dependent. These findings emphasise the need to prevent the presence of S. aureus strains and SEs production in foods
- Ocorrência e caracterização de Staphylococcus aureus isolados de trabalhadores da indústria alimentarPublication . Lopo, N.; Schmid, H.; Santos, C.; Meireles, H.; Castro, A.; Silva, J.; Teixeira, P.
- Prevalence of staphylococcus aureus nasal colonisation in health care personnel from a hospital in the North of PortugalPublication . Castro, A.; Silva, J.; Teixeira, P.