English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Kelner (J. Bacteriol., 65, 252, 1953), has found that ultraviolet irradiation inhibits deoxyribonucleic acid synthesis in Escherichia coli strain B/r. He sometimes observed a resumption of this synthesis after a certain period of postirradiation incubation. This has also been reported by Kanazir and Errera (Cold Spring Harbor Symposia Quant. Biol., 21, 19, 1956). As most of the irradiated cells were inactivated one wonders whether the deoxyribonucleic acid synthesized after the cells were exposed to ultraviolet irradiation was normally functioning nucleic acid. Not all bacteria seem to behave like E. coli. Bacillus cereus strain p2 was grown at 37 C in brain heart infusion broth (Difco) which was supplemented with 1 per cent of glucose and 0.5 per cent of phosphate. The pH was kept at 7.2 by adding potassium hydroxide. The culture was vigorously stirred during the whole experiment. At a certain cell density the cells were exposed to ultraviolet irradiation. The dose rate was about 600,uwatt per cm2. After the irradiation, the cells were incubated for one generation time (50 to 60 min) and harvested. There was no noticeable inhibition of over-all growth of the culture (turbidity), growvth of the survivors (number of viable cells), or ribonucleic and deoxyribonucleic acid synthesis during this period. This is shown in tables 1 to 3. To test the hypothesis that the postirradiation-formed nucleic acids

NUCLEIC ACID SYNTHESIS IN ULTRAVIOLET-IRRADIATED BACILLUS CEREUS