Bacillus (shape)

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Bacteria display a large diversity of cell morphologies and arrangements.

The word bacillus (plural bacilli) may be used to describe any rod-shaped bacterium, and such bacilli are found in many different taxonomic groups of bacteria. However, the name Bacillus, capitalized and italicized, refers to a specific genus of bacteria. The name Bacilli, capitalized but not italicized, can also refer to a more specific taxonomic class of bacteria that includes two orders, one of which contains the genus Bacillus.

Bacilli are usually solitary, but can combine to form diplobacilli, streptobacilli, and palisades.^[1]

There is no connection between the shape of a bacterium and its colors in the Gram staining. MacConkey agar can be used to distinguish among Gram negative bacilli such as E. coli and salmonella.^[2]

Examples of Gram positive bacilli

Clostridium species
Corynebacterium species

Examples of Gram negative bacilli

Salmonella species
Escherichia species
Pseudomonas species
Bacteroides species

References

Microbiology: Bacteria

Pathogenic bacteria

Bacterial disease
Coley's Toxins
Exotoxin
Lysogenic cycle

Human flora

Substrate preference

Oxygen preference

Structures

Cell envelope	Cell membrane Cell wall: Peptidoglycan NAM NAG DAP Gram-positive bacteria only: Teichoic acid Lipoteichoic acid Endospore Gram-negative bacteria only: Bacterial outer membrane Porin Lipopolysaccharide Periplasmic space Mycobacteria only: Arabinogalactan Mycolic acid

Outside envelope	Bacterial capsule Slime layer S-layer Glycocalyx Pilus Fimbria

Composite	Biofilm

Shapes

M: BAC

bact (clas)

gr+f/gr+a (t)/gr-p (c)/gr-o

drug (J1p, w, n, m, vacc)

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