[Microbiological analysis of blood culture obtained from children hospitalized at the Gastroenterology, Oncology and Daily Chemotherapy Wards of the Children's Memorial Health Institute in the years 1999-2002].

The aim of the study was to examine correlations between the use of different kinds of intravascular catheters and the type of microorganisms isolated from blood cultures. Blood samples obtained from gastroenterology, oncology and daily chemotherapy wards were examined. The samples were taken from catheter and peripheral blood in situations where blood infection was suspected.

Effect of null mutations in dnaK and dnaJ genes on conjugational DNA transfer, proteolysis and novobiocin susceptibility of Escherichia coli.

Escherichia coli null dnaJ and dnaKdnaJ mutants, when introduced to Hfr donor, impair its ability to DNA transfer during conjugation. The additive effect of both mutations was shown. Lack of DnaK and DnaJ chaperones also decrease the extent of proteolysis in mutant strains.