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BiologyGuide.app > HBIO1 > Bacteria & Viruses

Bacteria and Viruses

Feature

Optical microscope

Electron microscope

Radiation

Light

Electrons

Magnification

400x (max1500)

≈500 000x

Resolution

2µm

1nm / 0,001µm
Electrons have a small wavelength
Thus, higher resolution

Vacuum in microscope

Absent

Present

Specimen is

- Alive or dead
- Stained

- Dead (vacuum!)

Transmission microscope:
Electrons pass through internal
structure of specimen

Scanning microscope:
Beams of electrons are reflected
off specimens surface. Allows a
three dimensional view

Bacteria

Salmonella

Vibrio Cholera

Tuberculosis (TB)

Ability to Cause Disease

Antibiotics

Viruses

Human Immunodeficiency Virus (HIV)

Cycle of Infection