1. Lysteria monocytogenes and Shigella flexerni
use actin based motility to spread to other cells
-Cause diarrhea, vomiting, fever, and can lead to menningitis and spontaneous abortions
-Causes death in immunocompromised people (children, elderly, AIDS patients)
-Produce a protein that encourages production of actin filaments at the cell surface
-Propels bacteria through the cytoplasm (Comet tails)
-Rams into the cytoplasmic membrane and pushes through into the next cell
-Avoids much of the immune system
Movies:

2. Vibrio fischeri and its host, the bobtail squid
Close up of single bacterium (Vibrio)
Bacteria (Vibrio) glowing on a petri dish
Light organs on squid belly use
Vibrio to reflect the same
wavelength of light as the moon, hiding their shadow from preditors
A squid that uses glowing bacteria
to avoid being eaten (the glow from
the bacteria mimics the moonlight so the
squid can’t be seen from below-just looks
like moonlight from below)

3. Vibrio and its host, the Pineapple fish
Pineapple fish-lower jaw contains a photophore where
Vibrio reside. The bioluminescence attracts zooplankton.
-glows orange during the day, blue green by night.

4. The angler fish uses bioluminescent bacteria to attract prey

5. Quorum sensing in Vibrio
Bioluminescence is very expensive so the cells only want to bioluminesce when
other cells are around. No point if they’re not in the squid light organ.

6. The amazing Myxococcus xanthus

7. Myxococcus
Myxococcus xanthus cell
A Myxococcus swarm

8. Aggregation and “rippling” of Myxococcus

9. Fruiting bodies Myxococcus fruiting bodies
Dictyostellum discoideum-slime mold fruiting bodies (amoeba)

10. Slime mold fruiting bodies
Dictyostellum discoideum-slime mold fruiting bodies (amoeba)

11. Sporulation sites on the surfaces of WT colonies.
Bacillus fruiting bodies
Bacillus fruiting body. A sporulation gene was fused with lacZ
and the cells were plated on medium containing x-gal. You can
see the where sporulation occurs by the dark blue color
Branda S S et al. PNAS 2001;98:

12. Movies http://www.youtube.com/watch?v=oVGEFGzS7Wo&feature=related

13. Healthy ant

14. Zombie ants