| dna restriction and modification systems in salmonella. sq, a new system derived by recombination between the sb system of salmonella typhimurium and the sp system of salmonella potsdam. | as the result of p1-mediated cotransduction with serb from salmonella potsdam to the escherichia coli/salmonella typhimurium hybird 4617, one recombinant, l4004, was isolated which had a restriction-modification (r--m) system different from the sb and sp systems of its parents, and was designated sq. the genes of sq were allelic to those of the sb system of s. typhimurium and were shown by complementation experiments to be functionally related to those of the k system of e. coli. evidence that t ... | 1976 | 784901 |
| dna restriction and modification systems in salmonella. iii. sp, a salmonella potsdam system allelic to the sb system in salmonella typhimurium. | by screening 42 salmonella strains with p3, a temperate bacteriophage with an unusually wide host range, five new dna restriction and modification systems (r-m systems) were identified in five different serotypes in kauffmann-white group c. one of these systems, sp, in a pl-sensitive strain of s. potsdam, was analyzed genetically by pl transduction methods in which sp was transferred into s. typhimurium and c. coli/s. typhimurium hybrids. it was found that the genes of the sp system were allelic ... | 1975 | 1102934 |
| two dna recognition domains of the specificity polypeptides of a family of type i restriction enzymes. | the hsd genes of salmonella typhimurium and salmonella potsdam encode related type i restriction and modification systems designated sb and sp, respectively; the polypeptide encoded by the hsds gene dictates the dna sequence recognized. the hsds genes of the sb and sp systems have a conserved sequence of around 100 base pairs flanked by two nonhomologous (variable) regions of around 500 base pairs. recombination between the hsds genes of sb and sp generated a system (sq) with a different recogni ... | 1986 | 3025838 |
| genetic recombination can generate altered restriction specificity. | a recombinant strain, isolated following the transduction of an escherichia coli recipient carrying the salmonella typhimurium (sb) specificity genes with dna from a donor having the salmonella potsdam (sp) specificity, was shown [bullas, l.r., colson, c. & van pel, a. (1976) j. gen. microbiol. 95, 166-172] to have neither sb nor sp specificity but to encode a novel restriction specificity, sq. the heteroduplex analysis of the hsds (specificity) genes of the sb and sp restriction and modificatio ... | 1984 | 6091134 |
| accessory replicons of species of salmonella and shigella. | shigella and salmonella strains isolated from clinical samples were examined. out of 42 shigella strains tested, 17 (40%) were found to be colicinogenic and another 3 were lysogenic. all three lysogens yielded a phage antigenically homologous to coliphage p2. out of 30 strains tested, only 1 was found to be resistant to both neomycin and sulfamethoxazole. out of 48 strains of salmonella tested for drug resistance, only 2 showed multiple drug resistance. in contrast to shigella isolates, the salm ... | 1982 | 7149715 |
| was the egg a plausible source for the salmonella potsdam outbreak? | | 2004 | 15460961 |
| outbreak of salmonella potsdam associated with salad dressing at a restaurant. | between 27 january and 7 february 2002, 12 cases of salmonella potsdam infection were notified to nsw health of which nine were residents of the hunter health area. interviews with two cases notified by two local doctors initiated the investigation and revealed exposure to foods from the same restaurant (restaurant a). all new south wales s. potsdam cases, those accompanying cases to restaurant a and people from restaurant a booking lists were interviewed. of the 34 people interviewed, 17 met th ... | 2003 | 15508506 |
| emergence of salmonella enterica serovar potsdam as a major serovar in waterfowl hatcheries and chicken eggs. | salmonellosis is a common food-borne illness in humans caused by salmonella-contaminated poultry and their products. in hatcheries, 110 salmonella isolates were identified, mostly from first enrichment, and few from delayed enrichment. the salmonella prevalence in goose and duck hatcheries was higher when measured by four multiplex pcr methods than by traditional culture (73.8% vs. 44.35%, p < 0.05); 97.3% of 110 isolates were salmonella potsdam of serogroup c1 and other isolates were salmonella ... | 2011 | 21793436 |