Brief Reports
Copyright ©The Author(s) 1999.
World J Gastroenterol. Oct 15, 1999; 5(5): 445-447
Published online Oct 15, 1999. doi: 10.3748/wjg.v5.i5.445
Table 1 Properties of the boarded E. coli strains
A2Ara (lac proB)strA/FlacI-proA+B+
A3Ara (lac proB)strA/FlacIqpro+
CSH108Ara (gpt-lac)gyrA argEamproB/FlacI-Z-proA+B+
Table 2 The Arg+ reversion frequency of strain CSH108 in different boarding ways
SampleGroupArg+ reversion frequency (× 10-8)
Boarding sampleGroup I2.9
Group II1.8
Group III26.3
Ground controlA(1)1.2
Table 3 The occurrence of Lac+ phenotype among Arg+ revertants
SampleGroupTotal No. of Arg+ reversionNo. of Lac+Lac+/Arg+ (%)
Boarding sampleGroup I602541.7
Group II1395237.4
Group III38437697.9
Ground controlA(1)361438.9
Table 4 The survival and frequency of LacI- mutant from A3 strain
SampleGroupSurvival (× 108)LacI- frequency (× 10-8)
Boarding sampleGroup I3.60.4
Group II5.5240.0
Group III3.015.8
Ground controlA(1)3.6