Salmonella induces a switched antibody response without germinal centers that impedes the extracellular spread of infection.

T-dependent Ab responses are characterized by parallel extrafollicular plasmablast growth and germinal center (GC) formation. This study identifies that, in mice, the Ab response against Salmonella is novel in its kinetics and its regulation. It demonstrates that viable, attenuated Salmonella induce a massive early T-dependent extrafollicular response, whereas GC formation is delayed until 1 mo after infection.

The optimisation of the initial viscosity of an encapsulated glass-ionomer restorative following different mechanical mixing regimes.

Objectives: An optimisation of the mixing ratio of an encapsulated glass-ionomer restorative in terms of compressive strength, working characteristics and pore distribution following mechanical mixing with different mixing machines was undertaken.

Methods: Mean compressive fracture strengths, standard deviations and associated Weibull Moduli (m) were determined from series of 30 encapsulated specimens with varying powder/liquid mixing ratios. Working characteristics were assessed using an oscillating rheometer and scanning electron microscopy and image analysis was used to investigate the influence of the mixing ratios and mixing regime on the pore distribution.