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Nuclear transformations induced in E. coli K12S and K12S(λ26) by ultraviolet radiations and x-rays have been studied with ultrathin sections in the electron microscope. The nucleoplasm keeps its normal aspect during "fragmentation" and during "condensation" of the nucleus into the "vesicular" form. Serial sections show that the "fragmented" nucleus consists in reality of only one very tortuous vacuole. No difference either in the shape or in the fine structure of the nucleus could be observed between the lysogenic strain and the non-lysogenic strain. A high concentration of NaCl has a "condensation" effect on the fragmented nuclei and decreases the induction rate.

the journal of cell biology/the journal of cell biology

ETUDE AU MICROSCOPE ELECTRONIQUE DES TRANSFORMATIONS NUCLEAIRES DE <i>E. COLI</i> K12 S ET K12 S (λ26) APRES IRRADIATION AUX RAYONS ULTRAVIOLETS ET AUX RAYONS X

ETUDE AU MICROSCOPE ELECTRONIQUE DES TRANSFORMATIONS NUCLEAIRES DE E. COLI K12 S ET K12 S (λ26) APRES IRRADIATION AUX RAYONS ULTRAVIOLETS ET AUX RAYONS X