HISTORY OF MICROBIOLOGY Flashcards
which existed on earth billion years ago
over this time they evolved from microscopic forms.
They vary from appearance
ability to carry out different biochemical transformations
ability to grow in a wide different environment, and interactions in different microorganism and different forms of life.
One important ability is to quickly change their properties and adapt to changing environment
MICROORGANISMS
acquired from infected individuals
kill infected individual
VENEREAL DISEASES
lack of fuel
Undercooked pork spreads the parasite
ban eating of pork
TRICHINOSIS
After you eat trichinella larvae, they mature into adult worms in your intestine. The adults then produce larvae that migrate through various tissues, including muscle tissue.
TRICHINELLA CYST
FIRST OBSERVATIONS
Robert Hooke: ____
Leeuwenhoek: ____
CELLS & MICROBES
First report of cell structure 1665
‘Little boxes’ in cork : CELL
ROBERT HOOKE
First person to see bacteria
Pioneer of microscopy
Single lens microscope
1647
ANTON VAN LEEUWENHOEK
Beautifully crafted but had severe chromatic distortion
EARLY COMPOUND MICROSCOPE
____ and his father _____ started
experimenting with these lenses.
ZACCHARIAS JANSSEN & HANS
any damp body gives rise to living things
Miasma
ARISTOTLE
Living organisms could arise from non living matter
crocodiles from mud
HERODOTUS
small animals only
maggots from meat
mice from feed
VAN HELMONT
Italian poet physician 1668
Tested hypothesis of Spontaneous Generation
Meat in jars
three jars open to air> maggots
three jars sealed >no maggots
three jars fine net>no maggots
Concluded spontaneous generation did not still occur
FRANCESCO REDI
WHO Confirmed the experiments of Redi & Schwann
LOUIS PASTEUR
Added 20 years to the lifespan of every man woman and
improved the quality of life
Germ theory
Fermentation
Pasteurization
Rabies vaccine
LOUIS PASTEUR
WHAT ARE THE GOLDEN AGE OF MICROBIOLOGY
Fermentation
Pasteurization
Disinfection
Vaccines
Vintners thought sugar chemically converted to alcohol in
Pasteur, a chemist, was asked to help
Discovered
Yeast convert sugars to alcohol
Bacteria change alcohol to vinegar
_____ was biological process
FERMENTATION
Pasteur connected food spoilage and microbes
____ : Destroy microbes that cause spoilage by
Beer, wine, milk
Critical to development of Germ theory
PASTEURIZATION
Irish priest 1745
Said microbes spontaneously generated
Evidence
Heated chicken soup
poured into flasks
covered flasks
microbes appeared
JOHN NEEDHAM
Italian Monk 1765
Said Needham’s broths contaminated after heating
Evidence
chicken soup poured into flasks
covered flasks
then heated soup
microbes DID NOT appear
LAZARO SPALLANZANI
Concept proposed by RODULF VIRCHOW
German Scientist 1858
Virchow had No Evidence
BIOGENESIS
All organisms composed of one or more cells
Cells are smallest living things
Cells arise only from previously existing cells
Thus: all organisms are descendents of the first cells
THE CELL THEORY
Cell theory
Basic unit of life
1835 – digestive process
- hydrochloric acid
1836 – Pepsin
Role of microbes in alcohol fermentation
Pouchet argued that “Life Force” destroyed
SCHWANN EXPERIMENT
Causal relationship between microbes and disease
Disinfection controls surgical infection
Microbes cause disease
GERM THEORY OF DISEASE