where N/No is the fractional survival of the spore colony-forming ability, V is the "target volume" parameter in appropriate units, I is the radiation dose, and n is an integer (Woese, 1958a, b; Donnelan and Morowitz, 1957). The second equation is derived on the assumption that the radiosensitive portion of the spore consists of n pairs of targets, and survival occurs so long as one member of e...

Para la caracterización microbiológica y molecular se aislaron e identificaron microorganismos cultivables de 4 bioinsumos comerciales provenientes del occidente norte Nicaragua. Esto involucró tipificación morfológica a través de: tinción Gram para bacterias observación esporas hongos filamentosos. Se realizó extracción secuenciación ADN (gen ADNr 16S – bacterias, región ITS1- ITS4 filamentoso...

Repeated transfers in 5 per cent peptone or asparagine media of sensitive B. megatherium cultures containing C phage have made possible the isolation of lysogenic bacteria which produce different strains of phage. This is probably due to the failure of C virus to make the lysogenic adjustment while those of its variants which can succeed are selected. Four distinct plaque types have been isolat...

The developmental stage at which cells of Bacillus megaterium are committed to continue differentiation, i.e., sporulation, depends on both the previous growth medium and the new medium to which the cells are transferred for the commitment test. The latest "stage of no return," after which cells continue differentiation, no matter how rich in nutrients the medium, is reached as soon as the fore...