Invention of the Microscope
    Invention of the Microscope
  • The microscope was invented by a trio of Dutch 
   eyeglass makers in the late 1500s and 
   magnified objects up to 9x
  • The invention of the microscope allowed 
   scientists to view cells for the first time.
  • In 1665, Robert Hooke published his drawings of 
   cells, but these were the cell walls of cork cells; 
   the cells were no longer living
  • In the early 1670s, Anton van Leeuwenhoek was 
   the first person to examine living cells
       Types of Microscopes
        Types of Microscopes
   • There are two types 
    of microscopes:
    – Light microscopes
    – Electron 
     microscopes
       Light Microscope
       Light Microscope
  • Uses either sunlight or artificial light to 
   view objects.
  • The object being viewed must be thin 
   enough for light to pass through.
  • The advantage of a light microscope is 
   that it can magnify many microscopic 
   organisms while they are still alive.
  • The disadvantage of this microscope is 
   that it can only magnify about 1000x.
      Electron Microscope
      Electron Microscope
  • These microscopes either:
   –pass electrons through a thin slice of an 
    object (transmission electron microscope 
    or TEM)
   –examine the outside of an object (scanning 
    electron microscope or SEM)
  • The advantage of this microscope is that 
   they can magnify objects up to one million 
   times their actual size.
   Electron Microscope (cont.)
   Electron Microscope (cont.)
  • The biggest disadvantage of this 
   microscope is that specimens must be 
   fixed in position and placed in a vacuum 
   so organisms can not be alive.