been tested on bees to specify its optimum concentration
in apiaries studies, so as not to cause toxicological risks
to bees and not to overcome taste threshold in honey
(Bogdanov et al., 1999) as well as other undesirable effects
such us resistance factors, resulting for the indiscriminate
use of antibiotics.
Acknowledgements
The authors would like to thank Dr Gabriel Gutkind
(UBA) for his orientation in bioautography technique
and Dr Diana Fasce for IR advice. Also Claudia Faverin
and Adriana Cano for the assistance in providing the
statistical analysis and some anonymous reviewers. This
work was supported by UNMDP, ANPCyT and CONICET