Chapter 3 Section 1 Microscopes. Units of Measure Metric system of measurement International...
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Transcript of Chapter 3 Section 1 Microscopes. Units of Measure Metric system of measurement International...
![Page 1: Chapter 3 Section 1 Microscopes. Units of Measure Metric system of measurement International System of Measurement SI Base Unit is the Meter (m)](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649f045503460f94c18797/html5/thumbnails/1.jpg)
Chapter 3
Section 1 MicroscopesSection 1 Microscopes
![Page 2: Chapter 3 Section 1 Microscopes. Units of Measure Metric system of measurement International System of Measurement SI Base Unit is the Meter (m)](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649f045503460f94c18797/html5/thumbnails/2.jpg)
Units of Measure
Metric system of measurement International System of Measurement SI
Base Unit is the Meter (m) Kilometer = 1,000 m (2/3 of a mile) Centimeter = .01 m (1/2 diameter of
penny) Millimeter = .001 m (width of pencil tip) Micrometer = .000001m (bacteria cell) Nanometer = .000000001 m (water
mol.)
![Page 3: Chapter 3 Section 1 Microscopes. Units of Measure Metric system of measurement International System of Measurement SI Base Unit is the Meter (m)](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649f045503460f94c18797/html5/thumbnails/3.jpg)
Light Microscopes
Light passes through one or more lenses to produce an enlarged image of a specimen
![Page 4: Chapter 3 Section 1 Microscopes. Units of Measure Metric system of measurement International System of Measurement SI Base Unit is the Meter (m)](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649f045503460f94c18797/html5/thumbnails/4.jpg)
Electron Microscopes
Forms an image of a specimen using a beam of electrons rather than light
3 Types Transmission
electron microscopes (TEM)
Scanning electron microscope (SEM)
Scanning tunneling microscope
![Page 5: Chapter 3 Section 1 Microscopes. Units of Measure Metric system of measurement International System of Measurement SI Base Unit is the Meter (m)](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649f045503460f94c18797/html5/thumbnails/5.jpg)
Micrographs
The image produced by the microscope Type of microscope Magnification Name of object
Light Microscope 320 magnification Amoeba
![Page 6: Chapter 3 Section 1 Microscopes. Units of Measure Metric system of measurement International System of Measurement SI Base Unit is the Meter (m)](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649f045503460f94c18797/html5/thumbnails/6.jpg)
Magnification & Resolution Magnification
Makes the image appear larger than its actual size
Resolution A measure of the clarity of an image
High magnification & good resolution are needed to view details of extremely small objects clearly.
![Page 7: Chapter 3 Section 1 Microscopes. Units of Measure Metric system of measurement International System of Measurement SI Base Unit is the Meter (m)](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649f045503460f94c18797/html5/thumbnails/7.jpg)
Limitations of Microscopes Light microscopes: lower
magnification power but can view LIVING cells
Electron microscopes: higher magnification but cannot view living cells
![Page 8: Chapter 3 Section 1 Microscopes. Units of Measure Metric system of measurement International System of Measurement SI Base Unit is the Meter (m)](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649f045503460f94c18797/html5/thumbnails/8.jpg)
Light Microscope
Ocular lens - closest to the eye
Objective lens - closest to the specimen
Both magnify 40x objective &
10x ocular = 400x magnification
![Page 9: Chapter 3 Section 1 Microscopes. Units of Measure Metric system of measurement International System of Measurement SI Base Unit is the Meter (m)](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649f045503460f94c18797/html5/thumbnails/9.jpg)
Electron Microscopes
Can magnify 200,000x Both electron beam and specimen
must be placed in a vacuum chamber Living cells cannot be viewed 3 Types
Scanning Electron Microscopes (SEM) Transmission Electron Microscopes (TEM) Scanning Tunneling microscopes
![Page 10: Chapter 3 Section 1 Microscopes. Units of Measure Metric system of measurement International System of Measurement SI Base Unit is the Meter (m)](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649f045503460f94c18797/html5/thumbnails/10.jpg)
Scanning Electron Microscope
Specimen is coated with a thin layer of metal
3-D image of cell surfaces
Black & white image that can be artificially colored
![Page 11: Chapter 3 Section 1 Microscopes. Units of Measure Metric system of measurement International System of Measurement SI Base Unit is the Meter (m)](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649f045503460f94c18797/html5/thumbnails/11.jpg)
Thin metal coating
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SEM of Human Blood
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Foot of a House Fly SEM x300
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Transmission Electron Microscope
Cross section of specimen
Non living Stain with metal ions Electrons pass
through specimen & form image
Image is in black & white (Can be enhanced with color)
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Corona Virus (TEM)
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Cytoplasm of Liver Cell (TEM)
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Bacteriophages (TEM)
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Golgi Apparatus (TEM)
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Scanning Tunneling Microscope
3D image of the specimen’s surface
Can be used on living organisms
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Scanning Tunneling Image