Effect of the raw extract of Arthrinium strains (Hyphomycetes, Dematiaceae) on the growth of pathogenic bacteria in poultry feed.

Poultry feed contains a significant reservoir of bacteria and is a possible source of Salmonella typhimurium, Staphylococcus aureus and Escherichia coli, which can potentially infect farm animals and humans. The objective of this study was to determine whether the extract obtained from the culture of some Arthrinium species was able to inhibit the growth of these bacteria. The results obtained showed that the raw extracts of Arthrinium aureum, Arthrinium serenensis and Arthrinium phaeospermum inhibited the growth of Escherichia coli in poultry feed. In some cases the percentage inhibition of the growth of Escherichia coli was > 80%. With the raw extract of Arthrinium in poultry feed, the rate of growth of S. typhimurium fell to between 50% and 80%. The raw extract of A. serenensis had the lowest inhibitory activity. S. aureus counts were not affected by any Arthrinium raw extracts.

Antimicrobial activity of essences from labiates.

Bacteria, filamentous fungi and yeasts were subjected to the action of Lavandula officinalis, Melissa officinalis and Rosmarinus officinalis essences in a steam phase, using a microatmospheric technique. Due to the methodology employed, L. officinalis essence was more active in filamentous fungi than the other essential oils studied. All three essences possessed a similar degree of activity against the micro-organisms tested, though a relatively higher activity was seen in the case of M. officinalis.

[Comparative study of Trichophyton mentagrophytes and Trichophyton verrucosum]. / Estudio comparativo Trichophyton mentagrophytes y Trichophyton verrucosum.

Two species of the genus Trichophyton are described T. mentagrophytes and T. verrucosum, etiological agents of ringworm in rabbits. They are distinguished by their macroscopic and microscopic features, their ability to produce enzymes and their ability to utilize and ferment carbohydrates.