Microscopes Answers – Flashcards
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| Bright Field Microscopes |
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| used routinely in a laboratory |
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| Bright Field Microscope |
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| stained microorganisms are observed |
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| Bright field Microscope |
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| organisms appear dark against a bright background |
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| Bright Field Microscopes |
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| Dark Field Microscope |
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| organisms appear bright against dark background |
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| Dark Field Microscope |
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| an opaque stop inserted below the condenser, or stop is built into the condenser |
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| Dark Field Microscope |
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| only peripheral rays of light enter the condenser; the rays pass through the specimen at an angle, not directly |
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| Dark Field Microscope |
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in the disease syphilis we look for the organisms called treponemas
This is just a fast screening device to detect if the organisms are present or absent |
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Phase Microscope
used for accurate observances of |
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1. bacteria 2. parasites in clinical material 3. inclusion bodies in virus infected material 4. histological preparations It works on the principle of refractive index |
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| Phase Microscope |
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Examples
Objects such as bacteria and inclusion bodies are of different index from surrounding tissue. They will show up easy whereas normal tissue would a have to be stained to be seen. |
