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Mostrando 13-17 de 17 artigos, teses e dissertações.
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13. Evidence for an Arginine Exporter Encoded by yggA (argO) That Is Regulated by the LysR-Type Transcriptional Regulator ArgP in Escherichia coli
The anonymous open reading frame yggA of Escherichia coli was identified in this study as a gene that is under the transcriptional control of argP (previously called iciA), which encodes a LysR-type transcriptional regulator protein. Strains with null mutations in either yggA or argP were supersensitive to the arginine analog canavanine, and yggA-lac express
American Society for Microbiology.
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14. Genetic Mapping of a Defective Bacteriophage on the Chromosome of Bacillus subtilis 168
A genetic marker responsible for the killing activity of PBSX, a defective phage carried by Bacillus subtilis 168, has been located on the bacterial chromosome. Two mutant strains of B. subtilis 168, which produced tailless phage particles upon mitomycin C induction, were shown to carry lesions, designated xtl-1 and xtl-2, which were linked by transformation
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15. Characterization of a Shiga Toxin 2e-Converting Bacteriophage from an Escherichia coli Strain of Human Origin
An infectious Shiga toxin (Stx) 2e-converting bacteriophage (φP27) was isolated from Stx2e-producing Escherichia coli ONT:H− isolate 2771/97 originating from a patient with diarrhea. The phage could be transduced to E. coli laboratory strain DH5α, and we could show that lysogens were able to produce biologically active toxin in a recA-dependent manner. B
American Society for Microbiology.
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16. Linkage Groups in Bacillus pumilus Determined by Bacteriophage PBS1-Mediated Transduction
Two linkage groups were established in Bacillus pumilus NRRL B-3275 by bacteriophage PBS1 transduction. Group L contains the auxotrophic markers gly, his, and met. Group M contains the markers argO, met, ura, and cys.
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17. Spontaneous Auxotrophic and Pigmented Mutants Occurring at High Frequency in Bacillus pumilus NRRL B-3275
Broth cultures of Bacillus pumilus NRRL B-3275 (BpB1) grown at 25, 30, or 37 C contain 1 to 2% spontaneous auxotrophic mutants in both the exponential and stationary phases of growth. Of 70 such mutants isolated from cultures grown at 37 C, approximately two-thirds reverted at such a high frequency as to preclude their study. Of the remaining 22 mutants, 18