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Microbial World and You
Chapter 1
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What is Microbiology?
Micro - too small to be seen with the naked eye
Bio - life ology - study of
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Organisms included in the study of Microbiology 1. Bacteria 2. Protozoans 3. Algae 4. Parasites 5. Yeasts and Molds
• Fungi
6. Viruses
Bacteriology Protozoology Phycology Parasitology
Mycology Virology
Microorganisms - Microbes - Germs
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5 Kingdoms of Living Organisms
1. Animalia 2. Plantae 3. Fungi 4. Protista 5. Monera - Bacteria and Cyanobacteria
Eukaryotic vs. Prokaryotic
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5 Characteristics of Life
1. Cells 2. Maintain structure by taking up chemicals
and energy from the environment 3. Respond to stimuli in the external
environment 4. Reproduce and pass on their organization
to their offspring 5. Evolve and adapt to the environment
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Taxonomic Classification
Kingdom Phylum Class Order Family Genus species
Man Animalia Chordata Mammalia Primate Hominidae Homo sapien
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Taxonomic Classification
Kingdom Phylum Class Order Family Genus species
Cat Animalia Chordate Mammalia Carnivora Felidae Felis domestica
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Binomial System of Taxonomic Classification Use only the Genus and species Homo sapien Felis domestica Escherichia coli Genus and species are either underlined or
italicized Genus is always capitilized species is never capitilized
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Classification System 3 Domains 1978 Carl Woese
• 1. Bacteria • Unicellular prokaryotes with cell wall containing
peptidoglycan
• 2. Archaea• Unicellular prokaryotes with no peptodoglycan in
cell wall
• 3. Eukarya• Protista• Fungi• Plantae• Animalia
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Bacteria - what comes to mind? Diseases Infections Epidemics Food Spoilage Only 1% of all known bacteria cause human
diseases About 4% of all known bacteria cause plant
diseases 95% of known bacteria are non-pathogens
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Microbes Benefit Humans
1.Bacteria are primary decomposers - recycle nutrients back into the environment (sewage treatment plants)
2. Microbes produce various food products • cheese, pickles, sauerkraut, green olives• yogurt, soy sauce, vinegar, bread• Beer, Wine, Alcohol
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3. Microbes are used to produce Antibiotics
Penicillin
Mold • Penicillium notatum
1928 Alexander Fleming
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4. Bacteria synthesize chemicals that our body needs, but cannot synthesize
Example: E. coli• B vitamins - for metabolism• Vitamin K - blood clotting
Escherichia coli• Dr. Escherich• Colon (intestine)
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5. Biochemistry and Metabolism
Very simple structure rapid rate of reproduction provides “instant” data
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6. Microbial Antagonism
Our normal microbial flora prevents potential pathogens from gaining access to our body
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7. Insect Pest Control
Using bacteria to control the growth of insects
Bacillus thuringiensis • caterpillars• bollworms• corn borers
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8. Bioremediation
Using microbes to clean up pollutants and toxic wastes
Exxon Valdez - 1989
2 Genera• Pseudomonas sp.• Bacillus sp.
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9. Recombinant DNA TechnologyGene TherapyGenetic Engineering
Bacteria can be manipulated to produce enzymes and proteins they normally would not produce• Insulin• Human Growth Hormone• Interferon
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10. Microbes form the basis of the food chain Marine and fresh water microorganisms
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Microbes do benefit us, but they are also capable of causing many diseases Pneumonia Whooping Cough Botulism Typhoid Fever Measles Cholera Scarlet Fever Mumps Syphilis Gonorrhea Herpes 1 Chlamydia Tuberculosis Herpes 2 Meningitis Tetanus RMSV Strep Throat Lyme Disease AIDS Black Plague Diarrhea Gangrene
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History of the Study of Microorganisms 1665 Robert Hooke
• “little boxes” - “cells”• Cell Theory - all living things are made up of
cells
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Anton van Leeuwenhoek 1674
- 1st person to actually see living microorganisms
“wee animalcules”
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Spontaneous Generation
Theory that life just “spontaneously” developed from non-living matter
Example:• toads, snakes and mice - moist soil• flies and maggots - manure and decaying flesh
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Experiments to disprove Spontaneous Generation Francesco Redi 1668
Rudolph Virchow 1858• Theory of Biogenesis
• Cells can only arise from preexisting cells
Louis Pasteur 1861
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Pasteur designed special “swan-necked flasks” with a boiled meat infusion
Shape of flask allowed air in (vital force) but trapped dust particles which may contain microbes
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Germ Theory of Disease Hard for people to believe that diseases
were caused by tiny invisible “wee animalcules”
Diseases, they thought, were caused by:• demons• witchcraft• bad luck• the wrath of God• curses• evil spirits
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Robert Koch - 1st to prove that bacteria actually caused diseases 1876 Microbial Etiology of Infectious Disease
• etiology - the cause of a disease
Established “scientific rules” to show a cause and effect relationship between a microbe and a disease• Koch’s Postulates
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Koch’s Postulates 1. The same organisms must be found in all
cases of a given disease. 2. The organism must be isolated and
grown in pure culture. 3. The isolated organism must reproduce
the same disease when inoculated into a healthy susceptible animal.
4. The original organism must again be isolated from the experimentally infected animal.
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Exceptions to Koch’s Postulates
1. Some organisms have never been grown in pure culture on artificial media
Treponema pallidum - Syphilis
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Mycobacterium leprae Leprosy
Never been grown in pure culture on artificial media
Abdominal cavity of the Seven Banded Armadillo
Exceptions to Koch’s Postulates
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Exceptions to Koch’s Postulates
In exclusively human diseases, it is not morally acceptable to inoculate a deadly pathogen into a “human guinea pig”
HIV
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Koch established the Microbial Etiology of 3 important diseases of his day
1. Cholera (fecal-oral disease)• Vibrio cholerae
2. Tuberculosis (pulmonary infection)• Mycobacterium tuberculosis
3. Anthrax (sheep and cattle)• Bacillus anthracis
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Anthrax Bacillus anthracis
• Gram (+), non-motile, aerobic, spore forming rod
• Streptobacilli with central spores
• Livestock • Sheep, cattle, goats
• Humans• Handle hides, wool, goat hair, handicrafts from the Middle
East made from animal products
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3 Forms of Human Anthrax
1. Cutaneous Anthrax• Enters thru cut or
abrasion
• Results in painless ulcer (1-3 cm) with black (necrotic) center
• About 20% mortality rate in untreated cases
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2. Gastrointestinal Anthrax• Contaminated meat
• Abdominal pain, fever, vomiting blood, severe diarrhea
• 25% to 60% mortality rate
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3. Inhalation Anthrax• Initial symptoms
resemble common cold
• Progress to severe breathing problems and shock
• Usually results in death 1-2 days after onset of acute symptoms
• Mortality rate 99% in untreated cases
• Treatment usually not effective after symptoms are present
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Anthrax as a Biological Weapon Deadly if not treated early Spores can be produced in large quantities using basic
knowledge of biology Spores may remain viable for years (60 at least) Spores can be spread
• Missiles, rockets, bombs, mail, crop dusters ? No cloud or color No smell No taste Antibiotics – only effective if administered early (within
24 –48 hours)
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Koch - 1st to use Agar to solidify culture media
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Golden Age of Microbiology 1857 - 1914
Pasteur• Pasteurization
• Fermentation
Joseph Lister• Phenol to treat surgical wounds – 1st attempt to control infections
caused by microoganisms
Robert Koch• Koch’s Postulates
Edward Jenner• vaccination
Paul Erlich• 1st synthetic drug used to treat infections
• Salvarsan - arsenic based chemical to treat Syphilis• “salvation” from Syphilis
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Naming of Bacteria
Genus and species - Binomial System of Taxonomic Classification
Information usually given:• 1. Describes an organism• 2. Identifies a habitat• 3. Honors a scientist or researcher
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Bacterial Morphology
Bacilli
Cocci
Spiral
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Arrangements Staphylo Strepto Diplo Sarcinae Tetrad
Vibrio comma shaped bacter bacilli bacterium bacilli
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Staphylococcus aureus
Staphylococcus epidermidis
Streptococcus pneumoniae
Vibrio cholerae
Rhodospirillium rubrum
Bacillus subtilis
Micrococcus luteus
Escherichia coli Bacillus anthrasis Salmonella enteridis Streptococcus
pyogenes Steptococcus lactis Streptococcus faecalis Erlichia canis Campylobacter jujuni Helicobacter pylori Enterobacter
aerogenes
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