Effects of nitrofurantoin on viability, DNA synthesis and morphology of Vibrio cholerae cells.

Nitrofurantoin caused a dose dependent inhibition of growth and decrease in viability of V. cholerae cells, the 10% (D10) and 37% (D37) survival doses being 50 and 19 micrograms/ml respectively. The drug at a concentration of 60 micrograms/ml caused 86% inhibition of DNA synthesis. Both light and electron microscopic observations revealed that treatment with nitrofurantoin (60 micrograms/ml for 1 hr at 37 degrees C) led to a significant filamentation of the V. cholerae cells, ultrastructure of the cell cytoplasm, plasma membrane and cell wall however remaining unaltered from those of untreated cells. The results are discussed in relation to DNA lesions produced by and the carcinogenic potential of the drug.

Clonación de un cDNA de interferon leucocitario humano y su estrategia de producción en E. coli / Molecular cloning of a human leukocyte interferon cDNA and its production strategy in E. coli

En el presente trabajo se describe la clonación del cDNA correspondiente al interferón leucocitario humano tipo A, preparado a partir de el RNAm purificado de un mieloblastoma. Asimismo, se detalla la estrategia seguida para la producción de esta proteína en E. coli. Para estos efectos se fusionó un adaptador de DNA sintético al cDNA de interferón, uniéndole luego el promotor y sitio de unión a ribosomas del operón de triptofano. Se determinó utilizando un sistema de minicélulas, la expresión de interferón