1996i-243 2003h-958 advisorycommittees bacterialphysiologicalphenomena biotechnology congresses environmentalaspects fixation geneticallymodified geneticengineering genetics lacticacidbacteria lactobacillus lactococcus metabolism methods microbial microbialbiotechnology microbialgenetics nitrogen nitrogen-fixingmicroorganisms nitrogenfixation organisms plantgeneticengineering publicpolicy qu70c748g1977 recombinantmicroorganisms riskassessment riskmanagement