Isolation and Properties of a Putrescine-degrading Mutant of Escherichia Coli.

Purification and Properties of a .mine cy=Ketoglutarate Transaminase from Escherichia coZi*

Putrescine can be converted to y-aminobutyraldehyde by enzymes from different sources (l-3). It. is generally believed that this conversion is catalyzed by a nonspecific diamine oxidase. The presence of such an enzyme in bacteria, however, has not been firmly established experimentally. We have previously reported that, in a mutant of Escherichia co& B selected to grow on putrescine as the sole...

Isolation, Identification and in vitro Susceptibility of Avian Escherichia coli to Selected Fluoroquinolones

Construction of an iss deleted mutant strain from a native avian pathogenic Escherichia coli O78: K80 and in vitro serum resistance evaluation of mutant

BACKGROUND: Colibacillosis, caused by different serotypes of avian pathogenic Escherichia coli (APEC), is one of the important diseases in poultry industry. The isolate O78 is the most prevalent serotype of APEC in Iran. One of the APEC virulence factors, increased serum survival (iss) gene, is related to serum resistance. The usual form of colibacillosis in avian is extraintestinal, and serum ...

Isolation of Escherichia coli O157:H7 from ground beef samples collected from beef markets, using conventional culture and polymerase chain reaction in Mashhad, northeastern Iran

  Escherichia coli O157:H7 is an important human pathogen causing haemorrhagic colitis, haemolyticuraemic syndrom and thrombotic thrombocytopenic purpura. In this study, 100 ground beef samples were collected randomly from beef markets in June 2004. For isolation of the bacteria, samples were firstly enriched in modified trypticase soy broth, followed by plating onto sorbitol MacConkey agar sup...

Isolation of lytic bacteriophages against pathogenic Escherichia coli strains in poultry in the northwest of Iran

In this study, 90 internal organ samples of poultry with symptoms of colibacillosis were obtained from Maragheh poultry farms in East Azerbaijan, Iran. In total, 70 bacterial isolates were confirmed as Escherichia coli (E. coli) strains using standard biochemical tests, and antibiotic sensitivity was determined by the disk diffusion method. Antibiotics used in this study included ampicillin, pe...