Transcript m5zn_3b23ca4f32507a2

Introduction
What is Microbiology?
Micro Bio
Too small object to be seen by
the ordinary eyes
Refers to life
Ology
Means science
Microbiology is the science studying very small living cells that
could not be seen by ordinary eyes. These cells are called:
microbes, organisms, microorganisms, or pathogens.
Definition
It is the science that deals with studying of parasites, fungi,
bacteria, and viruses that cannot be seen by the naked eye and
cause human infectious diseases.
Types:
Helmeth
protozoa
fungi
bacteria
virus &prion
Prokaryotes & eukaryotes ????????
Bacteria
Fungi
Microbes
Parasites
Parasitology
Bacteriology
Viruses
Bacterial morphology
Morphology
1) Size
2)
3)
4)
5)
6)
7)
Shape
Arrangement
Stain
Motility
Capsulated or not
Spore forming or not
Morphology
1) Size …….. In Micron
- The unit of measurement is the micrometer (µm), known
as
micron = 1/1000 of a millimeter.
so, µm = 1/1000,000 of a meter, i.e. micron = 10-6
meter?
- Bacterial cells range in size from about o.2 to 8 µm.
Morphology
1) Size
2) Shape
- Cocci
- Bacilli
- Vibrios
- Spirochetes
3)
4)
5)
6)
7)
rounded cells
elongated cells
curved rods
helical filaments
Arrangement
Stain
Motility
Capsulated or not
Spore forming or not
Morphology
1) Size
Chain
2) 2) Shape
3) Arrangement Pairs
Clusters
4) Stain
5) Motility
6) Capsulated or not
7) Spore forming or not
Morphology
1) Size
2) 2) Shape
3) Arrangement
4) Stain
5) Motility
6) Capsulated or not
7) Spore forming or not
Gram +ve
Gram -ve
Morphology
1) Size
2) 2) Shape
3) Arrangement
4) Stain
5) Motility
6) Capsulated or not
7) Spore forming or not
Structure of the bacterial cell
Prokaryotes & eukaryotes
Prokaryotes & eukaryotes
Table 1
Prokaryote
Eukanyotes
1.Nucleus
- N. membrane
- Nucleoli
- Chromosomes
Primitive
Absent
Absent
-Single, circular
-Haploid
True
Present
Present
-Multiple, linear
-Diploid
1.Cytoplasm
- Mitochondria
- enzyme system
- Ribosome
Absent
Simple
70s (30s & 50s)
Present
Complex
80s (40s & 60s)
1.Cytoplasmic M
Present with no sterol except in
mycoplasma
Present and contain sterol.
1.Cell wall
Present and contain
peptidoglycan
If present as in fungi contain
chitin.
1.Replication
Binary fission
Mitosis
1.Motility
By flagella
By different organs
1.Examples
Bacteria
Protozoa and fungi