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Typhus, Rocky Mountain spotted fever and Q fever With one exception, they are all obligatory intracellular parasites and were not able to be cultured without host cells. Rickettsia

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(1)

Rickettsia

With one exception, they are all obligatory

intracellular parasites and were not able to be cultured without host cells.

Typhus, Rocky Mountain spotted fever and Q fever

(2)

Wolbachia

Intracellular parasite in many insect families

Phylogenetically very close to Rickettsia

(3)

Proteobacteria with Unusual Morphology

Spirilla genus

For example, Spirillum, Magnetospirillum, Bdellovibrio

Coiled curved bacilli

Magnetotaxic properties

(4)

Bdellovibrio

They are predatory on gram negative bacteria

(5)

Proteobacteria with Sheath

Sphaerotilus and Leptothrix

Sheathed bacteria are filamentous bacteria that form their own life cycle, formed by clustering flagellated cells in clusters.

(6)

Sheathed bacteria are common in habitats such as wastewater and contaminated streams. It is also

abundant in drip filters and activated sludge tanks of wastewater treatment plants.

(7)

Bacterium and Prosthetic / Stem Bacteria

Hyphomicrobium, Caulobacter

The stem contains organisms that form various cytoplasmic extension in the form of hif

Budding Bacteria: Hyphomicrobium

(8)

Caulobacter Differentiation

A mobile cell that does not divide

A second cell with an immobile stem that can proliferate

Three regulatory proteins (GcrA, CtrA and DnaA) are responsible for this differentiation.

First, CtrA is activated by phosphating with external signals.

This activates the genes necessary for flagella synthesis and motile cell formation.

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