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INTRO TO CELLS, image, image, image, image, image, image, image, image,…

- - - - Scientist Robert Hooke
        
        The person who gave cells their name.
      - The term cell to refer to the box-like structure
    - - The first person to observe, living, moving cells.
      - He observe:
        
        Living single - celled.
        
        Such a bacteria.
        
        Sperm cells.
    - - All diferent parts of plants and animals are made up of cells, and are made from other cells.
        
        The German scientist Rudolf Virchow joined this theory all cells must come from other cells.
        
        Seems to have stolen this idea from the Polish scientist Robert Remak.
    - - All living things are made up of one or more cells.
      - The cell is basic unit of life.
      - New cells arise from are exiting cells.
- - - - Multiple lenses.
      - Can deflect light to produce a much larger image.
      - Glasses has an interesting consequence:
        
        Imagen oriention.
        
        It is flipped relative to the real object.
      - Complex compound microscopes may not produce an inverted image.
        
        Include an additional lens that "inverts" the image return to its normal state.
  - - - Light microscope magnify up to about 400 times actual size
    - - If you have high magnification but low resolution, you will get a larger version of a blurry image.
- - - - See an enlarged image.
      - A benefit of light microscopy is that it can be performed on living cells.
    - - Visible light passes through the sample and is used to form a image directly.
      - Use optical tricks to enchance contrast.
        
        Details of cells and tissues are easier to see.
    - - Obtain images of sample that fluorence
      - Is collected and used to form an image of a cell or tissue in fluorescence
        
        Must be labeled with a dye or fluorescent label.
    - - Uses a laser to excite a thin layer of the sampler and collect only the light.
        
        Produces a sharp image without fluorencent interference.
- - - - Are used to examine not only whole cells, but also subcellular strutures.
    - - Living cells cannot be photographed.
  - - - An creation bearn travels back and across the surface of a cell or tissue.
      - Creates a detailed image of 3D surface.
    - - It is cut into extremely thin slices and the electron bearn passes through the slice.
      - Obtain delaited images of the internal structures of cells.