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

Temperature-sensitive mutants of Escherichia coli defective in the replication of the plasmid colicinogenic factor E1 (ColE1) were isolated following mutagenesis of E. coli K12 strain carrying the ColE1 factor. Following the mutagenic treatment an enrichment procedure utilizing the replacement of thymine with bromouracil in the ColE1 DNA duplicated at the restrictive temperature was used. The mutants isolated following this enrichment step were the result of a mutation event either in the host chromosome or in the ColE1 plasmid. The host mutants fell into three phenotypic classes based on the effect each mutation had on the maintenance of a variety of other extrachromosomal DNA elements. Phenotypic class I mutations affected all E. coli plasmids, both the I and F sex factor types as well as the ColE1 factor. Phenotypic class II mutations affected the maintenance of the ColE1 and the F sex factor type plasmids and not the I type, while phenotypic class III mutations affected only ColE1 replication. None of these mutations was found to have a significant effect on the replication of the E. coli chromosome. The plasmid-linked mutations fell into two phenotypic classes on the basis of the ability of the Flac episome to complement the mutation in the ColE1 plasmid.

TEMPERATURE-SENSITIVE MUTANTS FOR THE REPLICATION OF PLASMIDS IN ESCHERICHIA COLI I. ISOLATION AND SPECIFICITY OF HOST AND PLASMID MUTATIONS