The effect of antibiotic treatment on the in vivo selection of resistant haemolytic Escherichia coli clones in mice
✍ Scribed by Levente Emody; Monika Kerényi; István Bátai Jr.
- Book ID
- 109312508
- Publisher
- John Wiley and Sons
- Year
- 1984
- Tongue
- English
- Weight
- 269 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0378-1097
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Selection experiments between a lac+wild type and a lac-mutant of Escherichia co/i were conducted using a serial transfer procedure at two levels of total sugar concentration, i.e., 0.750 g/l and 1.0 g/l, The relative frequencies of both genotypes were assayed every 48 hours, at the time of transfer
Effects of neomycin, spectinomycin, tetracycline and chloramphenicol on the stringent control RNA synthesis and on ppGpp synthesis in the rel+-cells of Escherichia coli having a temperature-sensitive valyl-tRNA synthetase were examined. Without antibiotics, ppGpp began to accumulate and both RNA and