[In vitro study of antagonistic activity of bifidobacteria against Campylobacter and Escherichia coli causing gastroenteritis in children]. / Etude in vitro de l'antagonisme bactérien des bifidobactéries vis à vis des Campylobacter et Escherichia coli responsables de gastro-entérites infantiles.

Bifidobacteria represents the major constituents of the human intestinal microflora. It's a non mobile Gram (+) bacteria, which interest almost of the research about the relationships between the intestinal flora and human health. Bifidobacteria has an inhibition activity on the growth of the Campylobacter and E. coli G.E.I., in case of children gastro-intestinal infections by mixed cultivation in reconstituted infant milk adapted for the first age. This activity is the result of a group of mechanisms acting at the same time, it's probably the following: Competition of the nutrients indispensable for bacterial growth, action of the produced acid do not favorite the growth of the active pathogens germs (bactériocine) with acid pH.

[Refinement and study of the performance of a "Mycoplasma UG" kit for the research on urogenital Mycoplasmas]. / Mise au point et étude de performance d'un kit "Mycoplasma UG" pour la recherche des Mycoplasmes uro-génitaux.

The pathogenic role of genital Mycoplasmas is no more disputably. The diagnosis is based on the culture which may present some technical difficulties. The present study consist in a perfecting of a miniaturised system called "Mycoplasma UG" for the research, identification and titration of genital Mycoplasmas. The performance of the kit is studied with an important number of different types samples by comparison with the commercial kit "Mycoplasma Duo" and the classic reference method. The results obtained are satisfactory and constitute an important element in favour of a more advanced validation before the kit's trading.