Streptococcus salivarius 57.I is one of the most abundant and highly ureolytic bacteria in the human mouth. It can utilize urea as the sole nitrogen source via the activity of urease. Complete genome sequencing of S. salivarius 57.I revealed a chromosome and a phage which are absent in strain SK126.

We report here the 5.19-Mb draft genome sequence of Bacillus galactosidilyticus PL133 isolated from poultry litter. The isolate was an important member of the cultivable aerobic bacteria identified to have ureolytic activity, which is responsible for ammonia generation in poultry litter residue.

The hydrolysis of urea by urease enzyme of oral bacteria is believed to have a major impact on oral microbial ecology and to be intimately involved in oral health and diseases. To begin to understand the biochemistry and genetics of oral ureolysis, a study of the urease of Streptococcus salivarius, a highly ureolytic organism which is present in large numbers on the soft tissues of the oral cav...

The paper presents the first physicochemical and microbiological studies conducted in the northern area of Svalbard (Spitsbergen). Ten sediment samples were collected from the bottom of the longest fjord in the region, Wijdefjorden. Bottom sediments from ten lakes lo− cated along the shores of Wijdefjorden and Woodfjorden were also sampled. Organic matter content (LOI), water content, temperatu...

BACKGROUND Ureolytic activity of rumen bacteria leads to rapid urea conversion to ammonia in the rumen of dairy cows, resulting possible toxicity, excessive ammonia excretion to the environment, and poor nitrogen utilization. The present study investigated immunization of dairy cows against urease in the rumen as an approach to mitigate bacterial ureolytic activity therein. RESULTS Most alpha...