57 research outputs found
A new integral representation for quasi-periodic scattering problems in two dimensions
SobrevivĂȘncia e perfil de resistĂȘncia a antimicrobianos de Salmonella sp. isoladas em um sistema de tratamento de dejetos de suĂnos
A comparison of the ecology of Escherichia coli in the intestine of healthy unweaned pigs and pigs after weaning
A total of 51 clinically healthy pigs (14 underweaned and 37 weaned) from five litters, and aged 21 to 35 d, were studied. Escherichia coli isolates from the duodenum, jejunum, ileum, caecum and colon were differentiated on the basis of O-serogroup, biotype and resistance pattern. The complexity of the flora was influenced considerably by the presence or absence of the enterotoxigenic serotype 0149: K91, K88a,c (Abbotstown strain). When it was absent the E. coli flora of both weaned and unweaned pigs was complex with up to 25 strains being identified. The majority of these E. coli strains identified in each pig were isolated from only one of the five intestinal sites sampled. On the other hand, when the enterotoxigenic strain was present (14 pigs) it tended to dominate the E. coli flora at all levels of the intestine and this dominance was reflected in a corresponding fall in the total number of E. coli strains isolated per pig
Changes in the faecal enterococcal population of young chickens and its effect on the incidence of resistance to certain antibiotics
The effect of the management of calves on the prevalence of antibiotic-resistant strains of Escherichia coli in their faeces
The relationship between the energetic efficiency in different micro-organisms and the rate and type of metabolite overproduced
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