This volume contains the proceedings of the twelfth Ada-Europe conference, held in France in 1993. The French name "Ada sans fronti res" (the only French words in the book) symbolizes the unlimitedness and novelty of Ada, as well as Europe-wide interest.  Meer

Provided here is an up-to-date survey of gene transfers in the main natural habitats, with a special reference to genetically engineered microorganisms.  Meer