Most microorganisms are pathogenicFalse
The majority of bacteria are harmless True
Total number of bacterial species: about 10 million to a billion
What is a microorganism?
An organism or virus too small to be seen without a microscope. (Smaller than 0.5 mm)
Ex: Bacteria, Fungi, Protozoa, Algae, and Viruses
Microbiom: collection of microbes
Human cells vs. Microbial cells = 1:10
Which statement about Michaelangelo is not correct?
A. He was an Italian sculptor, painter, architect, poet and engineer
B. His masterpiece sculptor “David”, was made between 1501 and 1504
C. He was a French sculptor and poet
D. Created the famous fresco on the ceiling of the Sistine Chapel in Rome
Branches of Microbiology
Legumes +N2-fixing microorganisms
Microorganisms have important role in cycling plant nutrients (N, P, C, S)
Cattle production depends on rumen microorganisms
Food production (Dairy products (ogurt, cheese) sauerkraut, pickles, sausage, bread, beer, wine etc.)
Bioremediation (detoxification by use of microorganisms
Genetic Engineering (manipulation of genes in order to create new products)
* Who started Microbiology?
Antoine van Leeuwenhoek a Dutch merchant
The first person to see microbes as being ALIVE!
Father of bacteriology * * What Leeuwenhoek could see?
Different shapes of bacteria
Red blood cells, spermatozoa, plant and animal cells
Magnification of his microscope was 32X
Robert Hooke’s Microscope Compared to Leeuwenhoek’s
Robert Hook introduced the compound microscope
(objective lens + ocular lens)
Robert Hook (1665) reported that the smallest biological structural unites were “little boxes”-cells
CELL THEORY- all living things are composed of cells
Golden Age of Microbiology (1830-1900)
Scientists searched for answers to the following