Results 1 to 10 of about 3,419,267 (98)

R Factors in Hospital Infection [PDF]

BMJ, 1972
In order to assess the clinical importance of R factors 524 "coliform" infections were studied in a general hospital. Of these, 95 were caused by Pseudomonas aeruginosa. Among the remaining 429, 43% were caused by drug-resistant enterobacteria; resistance was frequently multiple and determined by transmissible R factors.
F M, Anderson, N, Datta, E J, Shaw
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Host Ranges of R Factors [PDF]

Journal of General Microbiology, 1972
SUMMARY: All R factors so far described can be transmitted to Escherichia coli. F-like R factors are transmissible to the Proteus group but not to the Pseudomonadaceae. Among fi - R factors, I-like plasmids are not transferable to Proteus although they mediate conjugation, allowing transfer of other plasmids to this group. They are not transmissible to
N, Datta, R W, Hedges
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R Factors from Serratia Marcescens [PDF]

Journal of General Microbiology, 1975
In recent years, Serratia marcescens has become established in certain localities as an agent of hospital infection and cross-infection (Clayton & von Graevenitz, 1966; Wilfert, Barrett & Kass, 1968; Davis, Foltz & Blakemore, 1970; Wilkowske, Washington, Martin & Ritts, 1970). In general, strains of S.
R W, Hedges, V, Rodriguez-Lemoine, N, Datta   +2 more
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R Factors from Proteus morganii [PDF]

Journal of General Microbiology, 1973
Summary: Twenty-eight R factors transmissible to Escherichia coli K12 were derived from 178 naturally occurring strains of Proteus morganii and evidence was found of non-transmissible resistance plasmids in some strains. Nine plasmids were assigned to group N; one P. morganii strain carried two N plasmids which were incompatible in reference strains of
R W, Hedges, N, Datta, J N, Coetzee, S, Dennison   +3 more
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Unstable Mutants of R Factor [PDF]

Japanese Journal of Microbiology, 1969
ABSTRACTThirty mutants sensitive to tetracycline were obtained from an R100 factor capable of conferring resistance to tetracycline (TC), chloramphenicol (CM), streptomycin (SM) and sulfanilamide (SA). Among the TC sensitive mutants, three showed a high frequency of spontaneous loss from host strains.
H, Hashimoto, S, Iyobe, S, Mitsuhashi
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R Factors from Proteus rettgeri [PDF]

Journal of General Microbiology, 1972
SUMMARY: Of 12 R factors transferred from wild strains of Proteus rettgeri to Escherichia coli K12, all were fi - Five were of the N-compatibility group; three belonged to a newly defined group T, of which Rts1 is the prototype; one belonged to group W. The other three constituted at least one compatibility group, not previously described.
J N, Coetzee, N, Datta, R W, Hedges
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R factors from Providence [PDF]

Microbiology, 2000
Of more than 100 R factors transferred from naturally occurring Providence strains, approximately 60 % belonged to the A-C compatibility complex. Plasmids of groups F1, J, N, P and X, and the prototype of a new group G were also transferred. The Providence R factor set differs from those of Proteus rettgeri and P.
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Facilitation of the Transfer of R Factor by the Resident R Factor [PDF]

Journal of Bacteriology, 1970
Transfer of some R factors were shown to be facilitated by resident R factors. The sex factor itself may be responsible for this phenomenon.
M, Yoshikawa, K, Sakai
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Trimethoprim Resistance determined by R Factors [PDF]

BMJ, 1972
R factors conferring a high level of resistance to trimethoprim have been identified in one strain of Escherichia coli and one of Klebsiella aerogenes , both isolated from infected urines.
M P, Fleming, N, Datta, R N, Grüneberg
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Origin of Haemophilus influenzae R factors [PDF]

Journal of Bacteriology, 1981
The Haemophilus influenzae R plasmids specifying resistance against one, two, or three antibiotics which have emerged in different parts of the world were shown to have closely related but not identical plasmid cores. The gene for ampicillin resistance in the H.
R, Laufs, F C, Riess, G, Jahn, R, Fock, P M, Kaulfers   +4 more
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