What is Microbiology? Micr o BioOlog y Too small object to be seen by the ordinary eyes Refers to life Means science Microbiology is the science studying.

What is Microbiology?What is Microbiology?

Too small object to be seen by the ordinary eyes

Refers to life 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.

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.

Introduction

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 ????????

Microbes

BacteriologyBacteriology

Virology

Virology

MycologyMycology

ParasitologyParasitology

Bacterial morphology

Morphology

1) Size2 )Shape

3 )Arrangement4 )Stain

5 )Motility6 )Capsulated or not

7 )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) Size2) Shape - Cocci rounded cells

- Bacilli elongated cells - Vibrios curved rods

- Spirochetes helical filaments

3) Arrangement4 )Stain

5 )Motility6 )Capsulated or not

7 )Spore forming or not

Morphology

1) Size 2) 2) Shape

3 )Arrangement4 )Stain

5 )Motility6 )Capsulated or not

7 )Spore forming or not

Chain

Pairs

Clusters

Morphology

1) Size2) 2) Shape

3 )Arrangement4 )Stain

5 )Motility6 )Capsulated or not

7 )Spore forming or not

Gram +ve

Gram -ve

Morphology

1) Size2) 2) Shape

3 )Arrangement4 )Stain

5 )Motility6 )Capsulated or not

7 )Spore forming or not

Structure of the bacterial cell

Prokaryotes & eukaryotes

Prokaryotes & eukaryotes

Table 1ProkaryoteEukanyotes

1.Nucleus- N. membrane- Nucleoli- Chromosomes

PrimitiveAbsentAbsent-Single, circular-Haploid

TruePresentPresent-Multiple, linear-Diploid

1.Cytoplasm- Mitochondria- enzyme system- Ribosome

AbsentSimple70s (30s & 50s)

PresentComplex80s (40s & 60s)

1.Cytoplasmic MPresent with no sterol except in mycoplasma

Present and contain sterol.

1.Cell wallPresent and contain peptidoglycan

If present as in fungi contain chitin.

1.ReplicationBinary fissionMitosis

1.MotilityBy flagellaBy different organs

1.ExamplesBacteriaProtozoa and fungi