Strikingly, at day 3, the number of LVS bacteria in blood was increased whereas the number of trkH mutant bacteria had drastically diminished.
When cell-free extracts of GBS were prepared and added to the cardiomyocytes at 1∶100 dilution, only the extracts from WT and not Δβh/c mutant bacteria had a significant effect on rate and extent (number of contractile cells per high power field) of HL-1 contractility at 1 h (Fig. 1A and B).
asdA mutants of Gram-negative bacteria have an obligate requirement for diaminopimelic acid (DAP), which is an essential constituent of the peptidoglycan layer of the cell wall of these organisms.
SodC is known to be a virulence factor in several pathogenic bacteria including Neisseria meningitides [ 27], Burkholderia cenocepacia [ 28], Salmonella enterica serovar Typhimurium and Salmonella choleraesuis [ 29] and Brucella abortus [ 30], and disruption of the sodC gene in these bacteria have generated attenuated mutants.
Some of these bacteria have well-developed and facile genetic systems for constructing mutants to determine gene function, and recombineering is a particularly effective tool.
Mutants for eat-2, as well as wild-type grown in axenic medium or in lower concentrations of bacteria, have higher activities of SOD and catalase [ 174, 179].
The bacteria have evolved.
Bacteria have progressively developed resistance.
RPMI 1640 as medium and an m.o.i. of 20 for L. monocytogenes EGD-e wild type or its Δlmo0799 mutant were used, the bacteria had been preincubated at 37°C with 0.3 M NaCl either in the dark or under exposure to blue light (λ = 455 nm) for 10 min at an illuminance of 30 microeinstein/m2/s.
