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The Microscope
Tools of the Biologist
2. Microscope
-before microscope, no one knew about
microbial world
-Leeuwenhoek perfected lenses
-Must be carried properly at all times
-Very expensive to replace
-We will use light microscopes, block light
source and image disappears
Microscope sketch
Important properties of
Microscopes
1. Magnification- the power of the
microscope to enlarge the image of an
object
2. Resolution- the power of the
microscope to show detail clearly
Compound Light Microscope Parts
and Function
1. Ocular (eyepiece)- part you look through
-contains lenses that contribute to total
magnification
-power of 10x (magnifies 10 times)
Microscope Parts and Function
2. Body tube- hollow tube that keeps the
lenses of the ocular and objectives at a
set distance
3. Nosepiece- holds objectives
Microscope Parts and Function
4. Objectives- contain lenses that contribute
to total magnification
Magnification formula- calculate total
magnification
Total mag. = ocular power X objective power
Total Magnification
Ocular Objective
10x red 4 = 40x
10x yellow 10 = 100x
10x blue 40 = 400x
*microscopes we use are parfocal- can
switch b/t lenses without much adjusting
**only use lens paper to clean objectives
Microscope Parts and Function
5. Arm- supports body tube
6. Base- supports entire microscope
(when carrying, keep hand back on base
because lamp will be hot!)
7. Stage- tray-like structure that supports
specimen/slide over stage opening
Microscope Parts and Function
8. Stage Clips- keep specimen/slide tight
against stage
9. Stage Opening- allows light to pass
through/around specimen
10.Diaphragm- controls amount of light that
reaches your eye
Microscope Parts and Function
11. Light source- provides light to create the
image that you see
12. Coarse adjustment- larger knob, that
moves 1 of 3 structures (body tube, stage,
or nosepiece) and allows for rough focus
Microscope Parts and Function
13. Fine Adjustment- smaller knob, moves
the objectives slightly and allows for fine
focusing
Microscope Classifications
• Based on how image is created
1. Light Microscope
-uses light to create specimen image
-lenses are glass or plastic
-magnification and resolution are good
(2,000x)
Benefits of Light Microscopes
• Smaller portable
• Cost effective
• Easy specimen prep (live specimens can
be used)
• Training simple/ user friendly
• Can see microscopic items
2 Types of Light Microscope
1. Simple- Has one lens
Ex: magnifying glass, Leeuwenhoek’s
microscope
2. Compound- Has 2 or more lenses
Ex: High school Biology microscope
(more lenses create better image and
better resolution)
2. Electron Microscopes
• HANDOUT
Contrast Light vs. Electron
Microscopes
• (Possible essay)
Development of the Microscope
HANDOUT
The Cell Theory
Development
1. Leeuwenhoek- First to see living cells
2. Hooke- coined the term cell while
viewing cork
3. Lamarck Put out publications that
4. Mohl indicated the cellular nature
5. Meyen of life (None of these men
given credit for cell theory)
Cell Theory Scientists
1. Schleiden (German)
-Botanist
-determined that all plants and their parts
(roots, stems, leaves, etc) are composed
of cells– plant cell drawing
Cell Theory Scientists
2. Schwann (German)
-Zoologist
-Determined that all animals and their
parts are composed of cells (tougher to
convince people of this)
Reasons for this:
1. Rounded shape- most “cells” were
square
2. No cell wall
Cell Theory Scientists
Animal cell drawing
Reason Schwann was successful was
because there was a nucleus present in
animal cell as well
Cell Theory Scientists
3. Virchow (German)
-Doctor
-determined that all cells come from pre-
existing cells
The Cell Theory
1. All living things are composed of cells
2. Cells reproduce or come from pre-
existing cells via cell division (mitosis)
3. Cells are the basic units of life or cells
are the smallest form of life
Possible essay: explain why cells are
smallest life forms

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The_Microscope.ppt

  • 2. Tools of the Biologist 2. Microscope -before microscope, no one knew about microbial world -Leeuwenhoek perfected lenses -Must be carried properly at all times -Very expensive to replace -We will use light microscopes, block light source and image disappears
  • 4. Important properties of Microscopes 1. Magnification- the power of the microscope to enlarge the image of an object 2. Resolution- the power of the microscope to show detail clearly
  • 5. Compound Light Microscope Parts and Function 1. Ocular (eyepiece)- part you look through -contains lenses that contribute to total magnification -power of 10x (magnifies 10 times)
  • 6. Microscope Parts and Function 2. Body tube- hollow tube that keeps the lenses of the ocular and objectives at a set distance 3. Nosepiece- holds objectives
  • 7. Microscope Parts and Function 4. Objectives- contain lenses that contribute to total magnification Magnification formula- calculate total magnification Total mag. = ocular power X objective power
  • 8. Total Magnification Ocular Objective 10x red 4 = 40x 10x yellow 10 = 100x 10x blue 40 = 400x *microscopes we use are parfocal- can switch b/t lenses without much adjusting **only use lens paper to clean objectives
  • 9. Microscope Parts and Function 5. Arm- supports body tube 6. Base- supports entire microscope (when carrying, keep hand back on base because lamp will be hot!) 7. Stage- tray-like structure that supports specimen/slide over stage opening
  • 10. Microscope Parts and Function 8. Stage Clips- keep specimen/slide tight against stage 9. Stage Opening- allows light to pass through/around specimen 10.Diaphragm- controls amount of light that reaches your eye
  • 11. Microscope Parts and Function 11. Light source- provides light to create the image that you see 12. Coarse adjustment- larger knob, that moves 1 of 3 structures (body tube, stage, or nosepiece) and allows for rough focus
  • 12. Microscope Parts and Function 13. Fine Adjustment- smaller knob, moves the objectives slightly and allows for fine focusing
  • 13. Microscope Classifications • Based on how image is created 1. Light Microscope -uses light to create specimen image -lenses are glass or plastic -magnification and resolution are good (2,000x)
  • 14. Benefits of Light Microscopes • Smaller portable • Cost effective • Easy specimen prep (live specimens can be used) • Training simple/ user friendly • Can see microscopic items
  • 15. 2 Types of Light Microscope 1. Simple- Has one lens Ex: magnifying glass, Leeuwenhoek’s microscope 2. Compound- Has 2 or more lenses Ex: High school Biology microscope (more lenses create better image and better resolution)
  • 17. Contrast Light vs. Electron Microscopes • (Possible essay)
  • 18. Development of the Microscope HANDOUT
  • 19. The Cell Theory Development 1. Leeuwenhoek- First to see living cells 2. Hooke- coined the term cell while viewing cork 3. Lamarck Put out publications that 4. Mohl indicated the cellular nature 5. Meyen of life (None of these men given credit for cell theory)
  • 20. Cell Theory Scientists 1. Schleiden (German) -Botanist -determined that all plants and their parts (roots, stems, leaves, etc) are composed of cells– plant cell drawing
  • 21. Cell Theory Scientists 2. Schwann (German) -Zoologist -Determined that all animals and their parts are composed of cells (tougher to convince people of this) Reasons for this: 1. Rounded shape- most “cells” were square 2. No cell wall
  • 22. Cell Theory Scientists Animal cell drawing Reason Schwann was successful was because there was a nucleus present in animal cell as well
  • 23. Cell Theory Scientists 3. Virchow (German) -Doctor -determined that all cells come from pre- existing cells
  • 24. The Cell Theory 1. All living things are composed of cells 2. Cells reproduce or come from pre- existing cells via cell division (mitosis) 3. Cells are the basic units of life or cells are the smallest form of life Possible essay: explain why cells are smallest life forms