Microscopes/ Microbial cell structure/ Prokaryotic cell division

Lecture 1 Pt3/4/5

Microbial sizes

Expressed as a meter (m)

• 1 m= 39.1 inches

Bacterial sizes

Expressed as micrometers (μm)

• 1μm = 1 millionth (10^-6) of a meter

Viral sizes

Expressed as nanometers (nm)

• 1 nm = 1 billionth (10^-9) of a meter

Photomicrograph

Photograph taken through the lens system of a compound microscope

Electron Microscopes

Have a much higher magnifying power than compound microscopes

• Two types: Transmission and Scanning

Transmission electron microscopes

Useful for observing the internal structures of cells

Scanning electron microscope

Useful for observing the outer surface of specimens

Cytology

Study of the microscopic structure, function and multiplication of cells

Eukaryotic Cells

Contain “true” nucleus

• Nucleoplasm, chromosomes, and a nuclear membrane

Posses a complex system of membranes and organelles