Microscopy Flashcards
A microscope
An instrument used to see objects too small to be seen with the naked eye
Role of Jansen and his son in developing the microscope (1590)
- Lenses placed in a tube
- Forerunner of the compound microscope
Role of Hooke in microscopy (1665)
- Observed cork compartments
- He named them ‘cells’
Role of van Leeuwenhoek in microscopy (1674)
- Simple microscopes with improved lenses (270x)
- Studied blood, yeast, insects etc.
- First to describe bacteria
Role of Schwann, Schleiden and Virchow in developing microscopy (1839)
(Grade 10 only)
Formulated the cell theory
Cell theory
(Grade 10 only)
- All living organisms are made up of cells
- the cell is the basic and smallest unit of life
- All cells develop from already existing cells
Modern additions:
- Energy flows inside cells
- DNA is passed on from cell to cell and instructs all cell activity
- All cells have the same basic chemical composition
Maximum magnification of a light microscope
1250-1500x
Role of Knott and Ruska in microscopy (1931)
- Developed the first electron microscope
- these can today magnify up to about 1 000 000x
Microscope tube
Part in which the eyepiece fits
Microscope eyepiece
The upper lens of the microscope for magnification (usually 10x)
Microscope objective
- Lower lens that is movable
- Objects can be studied with different magnifications
- e.g. 4X, 10X and 40X
Microscope nose piece
Part of the microscope that carries the objectives
Microscope clip
Keeps slides in position on the stage
Microscope arm
Handle of the microscope
Microscope coarse adjustment knob
- Moves the stage/tube with large movements to bring the object into focus
- Only used with the low power objective lens