azote bacterialgenetics bacterialphysiologicalphenomena biologiemoléculaire congresses etc experiments fixation fixaçãodenitrogênio geneticengineering genetics genomas genomics handbooks inoculation legumes manuals microbialgeneticengineering molecularbiology nitrogen nitrogen-fixingplants nitrogenfixation plantphysiology qu70 qu70c748g1977 symbiosis w3ke433d1978n[qu70k431978n]