Results 261 to 270 of about 21,646,526 (289)
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New England Journal of Medicine, 1970
THE ability of many gram-negative bacilli to resist certain commonly used antibiotics has been shown to be mediated in large part by R factors.
D H, Smith, P, Gardner
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THE ability of many gram-negative bacilli to resist certain commonly used antibiotics has been shown to be mediated in large part by R factors.
D H, Smith, P, Gardner
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Journal of Bacteriology, 1969
Experimental infections were induced in weanling pigs orally both with nalidixic acid (NA)-sensitive and -resistant strains of Salmonella choleraesuis var. kunzendorf , designated RC221 and RC221NA, respectively. Prior to the time of infection, cultures of normal bacterial flora were isolated
H, Jarolmen, G, Kemp
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Experimental infections were induced in weanling pigs orally both with nalidixic acid (NA)-sensitive and -resistant strains of Salmonella choleraesuis var. kunzendorf , designated RC221 and RC221NA, respectively. Prior to the time of infection, cultures of normal bacterial flora were isolated
H, Jarolmen, G, Kemp
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The molecular nature of R-factors
Journal of Molecular Biology, 1966The acquisition of infectious multiple drug resistance factors by Proteus mirabilis was correlated with the addition of one or more physically recognizable, native, satellite DNA fractions. The spontaneous loss of one or more drug resistance characteristics carried by R-factors was correlated with either an apparent loss of particular density regions
Stanley Falkow +3 more
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Molecular and General Genetics MGG, 1972
Eight R factors are described which fall into four compatibility groups, distinct from previously described F-like and I-like groups. E. coli K12 carrying one of these factors, TP114, supports multiplication of the I-specific phage If1. However, TP114 is fully compatible with the I-like factor T-Δ and with all the other R factors described in this ...
N D, Grindley +2 more
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Eight R factors are described which fall into four compatibility groups, distinct from previously described F-like and I-like groups. E. coli K12 carrying one of these factors, TP114, supports multiplication of the I-specific phage If1. However, TP114 is fully compatible with the I-like factor T-Δ and with all the other R factors described in this ...
N D, Grindley +2 more
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Cancer and the unavoidable R factor
Science, 2017Cancer Etiology Most textbooks attribute cancer-causing mutations to two major sources: inherited and environmental factors. A recent study highlighted the prominent role in cancer of replicative (R) mutations that arise from a third source: unavoidable errors associated with DNA replication. Tomasetti et al.
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R Factors for Aminoglycoside Antibiotics
Journal of Infectious Diseases, 1969The definition of R factors by Japanese scientists 10 years ago opened a new chapter in the saga of antibiotic resistance among enteric bacteria [1]. This package of extrachromosomal genes, comprised of the resistance determinants, which mediate resistance to a variety of environmental hazards, and the resistance transfer factors (RTF), which mediate ...
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Independence number, connectivity, and r‐factors
Journal of Graph Theory, 1989AbstractWe show that if r ⩾ 1 is an odd integer and G is a graph with |V(G)| even such that k(G) ⩾ (r + 1)2/2 and (r + 1)2α(G) ⩽ 4rk(G), then G has an r‐factor; if r ⩾ 2 is even and G is a graph with k(G) ⩾ r(r + 2)/2 and (r + 2)α(G) ⩽ 4k(G), then G has an r‐factor (where k(G) and α(G) denote the connectivity and the independence number of G ...
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Inhibition of R-factor transfer by levallorphan
Biochemical and Biophysical Research Communications, 1971Abstract The transfer of an R-factor from Proteus Rettgeri to Escherichia coli W 677 was strongly inhibited by levallorphan at concentrations which do not affect growth of either the donor or the recipient cells. The effect is not due to the transfer of the episom itself but to inhibition of mating-pair formation.
R, Löser +2 more
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