1.1 What is a microbe?

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• 1.1 What is a microbe?
• 1.2 Microbes in our lives
• 1.3 The history of microbiology

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Microbial world
Organisms (living)
Infectious agents (non-living)
eukaryotes
Prokaryotes (unicellular)
viruses
viroids
prions
Algae (unicellular or multicellular
Fungi (unicellular or multicellular
Other multicellular organisms
Eubacteria
Archaea
Protozoa (unicellular)
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The discovery of microorganisms
Antony van Leeuwenhock (1632-1723)
The first person to accurately observe and
describe microorganisms
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Morphology of a gram-positive bacterial cell
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Arrangement of Spherical Bacterial Cells
diplococci
sarcinae
streptococci
staphylococci
tetracocci
Sphericalcoccus
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Nonspore - forming rod shaped bacteria Most
nonspore forming rod shaped bacteria are Gram-
Representatives Escherchia coli Alcaligenes Prote
us Flavobacteria Pseudomonas Rhizobium Azotobacter
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Conidiospores
Conidiospores are arranged in chains at the end
of a conidiophore
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