| [tetracycline-resistant plasmid of salmonella enteritidis isolated in kumamoto city]. | we isolated salmonella choleraesuis subsp. choleraesuis serovar. enteritidis (s. enteritidis) from a mass of cases which broke out in september, 1991 in kumamoto city. the isolates were shown to hold plasmids on which a tetracycline (tc)-resistant gene was located. the plasmid, about 9 kb in size, was capable of expressing the gene in escherichia coli, unstable in s. enteritidis and escherichia coli. thus in order to investigate the creeping prevalence of the tc-resistant plasmid in kumamoto cit ... | 1994 | 7829903 |
| comparison of salmonella isolation rates in different types of egg-layer hen houses in chiba, japan. | this study investigated the differences in salmonella isolation rates in environmental samples taken from several types of hen houses in chiba, japan. in addition, for the detailed epidemiologic survey, environmental samples, hens, and rodents were collected from salmonella-contaminated windowless houses on three farms. as a result, salmonella was isolated from four (80%) of five farms with windowless hen houses; salmonella enteritidis was isolated from a single windowless house. in contrast, on ... | 2001 | 11332483 |
| mutagenic potentials of amberlite xad-2-resin extracts obtained from river and drinking waters in the northwest district of chiba, japan. | amberlite xad-2 resin extracts of river and drinking water sampled from the northwest district of chiba prefecture in each month during the period from january to december 2008 were investigated to characterize and determine their mutagenic potentials and polycyclic aromatic hydrocarbon (pah) levels. the extracts from the river water were shown to be mutagenic in salmonella typhimurium ta98 (a flameshift mutagen) without s9 mix, with higher mutagenic responses in summer and early fall seasons. w ... | 2010 | 21139331 |