Now showing items 1-10 of 50
Evaluation of a new transport medium for the preservation of oral streptococci
(Elsevier, 1973-07)
The survival of pooled plaque bacteria and a mixed suspension of Streptococcus mutans, Streptococcus sanguis, Streptococcus mitis, and Streptococcus salivarius were tested in three transport media. A new, non-nutritive, ...
Two routes for synthesis of phosphoenolpyruvate from C4-dicarboxylic acids in
(Elsevier, 1974-08-19)
Mutants of defective in both phosphoenolpyruvate carboxykinase and phosphoenolpyruvate synthetase are unable to use C4-dicarboxylic acids such as succinate and malate as carbon and energy sources for growth. Revertants ...
Optimal design of feedback control by inhibition
(Springer-Verlag, 1974-06)
A recently developed, nonlinear method of systems analysis has been used to compare alternative patterns of control by feedback inhibition in otherwise equivalent unbranched biosynthetic pathways. The steady state performance ...
The predominant cultivable flora of tooth surface plaque removed from institutionalized subjects
(Elsevier, 1972-09)
Tooth surface plaque was removed from 11 institutionalized individuals and cultured on agar plates in an anaerobic chamber. The recovery of organisms on a dilute trypticase yeast extract medium (MM10), incubated anaerobically, ...
Evidence for the utilization of host tRNA(m5 U)methylase to modify tRNA coded by phage T4
(Elsevier, 1973-04)
Mutants of Escherichia coli defective only in the biosynthesis of 5-methyluridine (ribothymidine) in their transfer ribonucleic acid (tRNA) were employed to investigate whether phage T4 induces its own tRNA (m5U)methylase ...
The in-vitro effect of fungal dextranase on human dental plaque
(Elsevier, 1972-01)
Suspensions of dental plaque from eighteen children with high caries activity were hydrolyzed in vitro by a partially purified fungal dextranase isolated from Penicillium funiculosum NRRL 1768. The dextranase preparation ...
Identification of Streptococcus mutans serotypes in dental plaque by fluorescent antibody techniques
(Elsevier, 1973-06)
The presence of Streptococcus mutans in dental plaque may be related to human dental caries. The cultural identification of this organism in plaque is not likely to be used routinely in a clinical or epidemiological ...
Effects of rifampicin, streptolydigin and actinomycin D on the replication of Col E1 plasmid DNA in Escherichia coli
(Elsevier, 1973-04-15)
We recently reported (Clewell et al., 1972) on an inhibitory effect of rifampicin on Col E1 plasmid replication. The present study represents a further characterization of this phenomenon as well as a study of the effects ...
The effects of the relA gene on the synthesis of aminoacyl-tRNA synthetases and other transcription and translation proteins in Escherichia coli B
(Springer-Verlag, 1976-01)
The effects of a partial restriction of valyl-tRNA aminoacylation on the synthesis of aminoacyl-tRNA synthetases, ribosomal proteins, and other translation and transcription proteins were examined in otherwise isogenic ...
Identification and characterization of the cAMP binding proteins of yeast by photoaffinity labeling
(Elsevier, 1979-10-12)
Contrary to previous reports, we find the molecular weight of the major cAMP-binding protein in to be 54,000 daltons. A number of lower molecular weight proteins have also been identified and are believed to be breakdown ...