Volume 3 - Gram positive bacteria with low G + C content (< 50%)

Three classes of the phylum Firmicutes

• •  Clostridia - tend to be anaerobic and endospore formers

•  Mollicutes - mycoplasmas (no cell walls)

•  Bacilli - Gram-positive aerobes or facultative anaerobes, rods or cocci, some endospore formers

Volume 4 - Gram positive bacteria with high G + C content (> 50-55%)

• •  All belong to the phylum Actinobacteria

•  Some are filamentous

Volume 5 - Gram negative with various morphologies

Nine phyla of which four are presented below

• • Phylum Planctomycetes - some have a membrane-bound nucleus

• Phylum Chlamydiae - obligate intracellular parasites important in disease

• Phylum Spirochaetes - helical-shaped, Gram-negative motile bacteria (axial filaments)

• Phylum Bacteroidetes - ecologically significant species are found in this phylum

 

REFERENCES:

Text Books:

1. Jeffery C. Pommerville. Alcamo's Fundamentals of Microbiology (Tenth Edition). Jones and Bartlett Student edition.

2. Gerard J. Tortora, Berdell R. Funke, Christine L. Case. Pearson - Microbiology: An Introduction. Benjamin Cummings.

Reference Books:

1. Lansing M. Prescott, John P. Harley and Donald A. Klein. Microbiology. Mc Graw Hill companies.

2. Biology, Raven and Jhonson, 6 th edition (2001)

3. Microbiology, Pelczar. M.J , Chan E.C.S, Kreig N.R, 5th edition (2007)