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Microbiology 155
Chapter 1
An Introduction to the World of Microbiology
1. Archaebacteria
Archaebacteria – Very small bacteria that are
adapted to extreme conditions
Thermophiles- extreme heat
Halophiles – high concentrations of salt
Methanogens – live in a hostile environment and
produce methane gas as a by product of their
life style
Sulfur loving bacteria – live in high
concentrations of sulfurous gases
2. Bacteria
• Eubacteria – True bacteria – Includes
environmental bacteria such as nitrogen
fixing bacteria and bacteria of decay
and decomposition as well as pathogens.
• Cyanobacteria – Formerly known as blue
green algae – small, unicellular algae
found in ponds, lakes, streams, and the
ocean. Essential to the web of life
Prokaryote cells
•Are very small and undifferentiated
• Lack a nuclear membrane
• Lack cellular organelles like
mitochondria
• Have unique cell walls and cell
membranes
• Have only one circular chromosome
Bacterial Growth= Cell Division
Binary fission
Bacterial cells can be seen with a
light microscope or an electron
microscope
3. Eukarya
•
•
•
•
•
Includes
Protozoans
Algae
Fungi
Animals and Plants
Algae
Eukaryote cells with
cellulose cell wall
Aquatic environment
Microbes that Cause Disease
•
•
•
•
•
Viruses- acellular
Bacteria
Fungi
Protozoans
Worms( Helminths )
Viruses
Blepharisma, large protozoan
Paramecium
Amoeba
Malaria
Schsiotosomes, a
parasitic worm
Candiasis, yeast
Historical Roots of Microbiology
1660: Robert Hooke (1635-1703) published "Micrographia", containing
drawings and detailed observations of biological materials made with the
best compound microscope and illumination system of the time.
1676: Anton von Leeunhoek (1632-1723) was the first person to observe
microorganisms.
1883: Carl Zeiss pioneered developments in microscopy (such as immersion
lenses and apochromatic lenses which reduce chromatic aberration) which
perist until the present day.
1931: Ernst Rusko -constructed the first electron microscope.
1688: Francesco Redi (1626-1678) was an Italian physician who
refuted the idea of spontaneous generation by showing that
rotting meat carefully kept from flies will not spontaneously
produce maggots.
1836: Theodor Schwann (1810-1882) helped develop the cell
theory of living organisms, namely that that all living organisms
are composed of one or more cells and that the cell is the
basic functional unit of living organisms.
1861: Louis Pasteur (1822-1895) famous experiments with
swan-necked flasks finally proved that microorganisms do not
arise by spontaneous generation.
Redi’s
Experiment
Edward Jenner
1546: Hieronomus Fracastoro (Girolamo Fracastoro) wrote "On
Contagion" ("De contagione et contagiosis morbis et curatione"), the
the first known discussion of the phenomenon of contagious infection.
1835 Agostino Bassi de Lodi showed that a disease affecting silkworms
was caused by a fungus - the first microorganism to be recognized as a
contagious agent of animal disease.
1847: Ignaz Semmelweis (1818-1865), a Hungarian physician who
decided that doctors in Vienna hospitals were spreading childbed
fever while delivering babies. He started forcing doctors under his
supervision to wash their hands before touching patients.
1857: Louis Pasteur proposed the "germ theory" of disease.
1867: Joseph Lister (1827-1912) introduced antiseptics in surgery. By
spraying carbolic acid on surgical instruments, wounds and dressings,
he reduced surgical mortality due to bacterial infection considerably
Lister’s Carboxylic spray
Sterile Surgery
Pasteur Fermentation
Beer and Bread
1876: Robert Koch (1843-1910). German bacteriologist was the first
to cultivate anthrax bacteria outside the body using blood serum
at body temperature. Building on pasteur's "germ theory", he
subsequently published
"Koch's postulates" (1884), the critical test for the involvement of a
microorganism in a disease:
The agent must be present in every case of the disease.
The agent must be isolated and cultured in vitro.
The disease must be reproduced when a pure culture of the agent is
inoculated into a susceptible host.
The agent must be recoverable from the experimentally-infected
host.
Fields of Microbiology
Bacteriology
Virology
Epidemiology
Immunology
Parasitology
Protozoology
Mycology
Virology
Modern Microbiology
Recombinant DNA technology and
genetic engineering
Biotechnology