Abstract
* Corresponding author. Present address: Centra de Investigacion sobre Fijacion de Nitrogeno, UNAM, Apdo. Postal 565-A, Cuernavaca, Morelos, Mexico. Fax: (73) 17 55 81. Electronic mail address: novikova{at}n2.cifini.unam.mx .
International Journal of Systematic and Evolutionary Microbiology 1994; 44(4):734 · https://doi.org/10.1099/00207713-44-4-734
* Corresponding author. Present address: Centra de Investigacion sobre Fijacion de Nitrogeno, UNAM, Apdo. Postal 565-A, Cuernavaca, Morelos, Mexico. Fax: (73) 17 55 81. Electronic mail address: novikova{at}n2.cifini.unam.mx .