Now showing items 41-50 of 50
Growth of [lambda] variants with added or altered promoters in N-limiting bacterial mutants: Evidence that an N recognition site lies in the PR promoter
(Elsevier, 1976-05)
Transcription of the [lambda] genome, initiating at the early rightward promoter (PR), traverses the cII-O-P operon and extends through the Q gene. In the absence of the [lambda] N function, this transcription is prematurely ...
Effect of T4 modification of host valyl-tRNA synthetase on enzyme action in vivo
(Elsevier, 1975-10)
It has previously been found that bacteriophage T4 modifies the valyl-tRNA synthetase of its host; in this work we have examined the effects of this modification on the action of the enzyme in vivo. For this purpose we ...
A temperature sensitive nonsense mutation affecting the synthesis of a major protein of Escherichia coli K12
(Springer-Verlag, 1975-06)
A temperature sensitive nonsense (TSN) mutant of E. coli K12 has been isolated in which a major bacterial protein is not synthesized at 42° C. This protein is found in the parental strain at 42° C and in cells rendered ...
Implantation of Streptococcus mutans on tooth surfaces in man
(Elsevier, 1978)
Streptomycin-resistant strains of Streptococcus mutans were implanted as adherent growth on artificial fissures (AF). A stock culture of strain E49 (serotype a) and human isolates of serotype c strains were each implanted ...
[lambda]imm[lambda][middle dot]434: A phage with a hybrid immunity region
(Elsevier, 1973-11)
The genomes of coliphages [lambda] and [lambda]imm434 are identical with the exception of the immunity region, which codes for the respective repressors and corresponding operators. Although previous genetic studies failed ...
Feedforward inhibition in biosynthetic pathways: inhibition of the aminoacyl-tRNA synthetase by the penultimate product
(Elsevier, 1979-04-21)
Inhibition of the aminoacyl-tRNA synthetase by the penultimate product of a pathway for the biosynthesis of an amino acid has been reported for several pathways in many different types of organisms. A regulatory role for ...
Transient rates of synthesis of individual polypeptides in E. coli following temperature shifts
(Elsevier, 1978-03)
The effect of temperature shifts on the rates of synthesis of selected individual polypeptides in wild-type E. coli was studied through pulse-labeling and resolution of protein by the O'Farrell two-dimensional gel system.The ...
The salivary concentration of Streptococci mutans and Streptococci sanguis and their colonization of artificial tooth fissures in man
(Elsevier, 1977)
Artificial fissures were inserted in 3 subjects for 1-21 days. At a salivary concentration of 103 colony-forming units (CFU) Strep. mutans/ml, fissures were colonized by this organism. The proportional distribution of ...
RNA dependent DNA synthesis in cell free preparations of human leukemia cells
(Elsevier, 1971-02-19)
A cell free preparation of human leukemic cells, grown in tissue culture, incorporated H3-thymidine phosphate into an acid insoluble product which was rendered acid soluble by the action of DNAase but not KOH or RNAase. ...
Intraoral spread of Streptococcus mutans in man
(Elsevier, 1978)
Streptomycin-resistant strains of Streptococcus mutans were reliably established in 3 subjects by the use of artifical fissures (AF) containing adherent growth of the Strep. mutans strain. The intraoral spread of these ...