The effect of different fermenting microorganisms on growth of a mycotoxin-producing Aspergillus nomius was assayed. Two lactic acid bacteria, Lactobacillus fermentum and Lactobacillus rhamnosus, and Saccharomyces cerevisiae, all of which are widely used in fermentation and preservation of food, were assayed on their fungus inhibitory properties. Assays were carried out by simultaneous inoculation of one of the possible inhibiting microorganisms and the fungus or subsequent inoculation of one of the microorganisms followed by the fungus. All three microorganisms assayed showed growth inhibition of the mycotoxin-producing Aspergillus strain. L. rhamnosus O236, isolated from sheep milk and selected for its technological properties, showed highest fungal inhibition of the microorganisms assayed. The use of antifungal LAB with excellent technological properties rather than chemical preservatives would enable the food industry to produce organic food without addition of chemical substances.

The analysis of 19 physiological properties of 28 strains of Nocardia brasiliensis isolated from soil reveal differences which could be of great value in distinguishing pathogenic from nonpathogenic strains.

The isolation of Nocardia pathogenic for man in soil of Tucumán revealed the convenience of undertaking a study of their virulence, to evaluate any potential danger it may imply. Thirty three strains were studied: 28 N. brasiliensis, 3 N. asteroides and 2 N. caviae by inoculating albino Swiss mice into the footpads and intraperitoneally. The results obtained revealed the existence of Nocardia of variable aggresiveness in the soil of Tucumán.

The purpose of the present paper is to improve the understanding of the incidence of Candidosis in human infections. 85 species of Candida isolated from deep-seated and superficial Candidosis were studied. Identification was attained using the key of N. van Uden & H. Buckley (22).

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