In 1665 , Robert Hooke observed incision of the stem Quercus suber cork using a microscope . He found the empty spaces in the thick walled observations . Robert Hooke called the empty spaces with cellulae term means cell . Robert Hooke discovered cells are the cells that have died cork . Note the Fig. Since that discovery , some scientists are racing to find out more about the cell .
Cork cells ( top ) and Robert
Dutch scientist called Antonie van Leeuwenhoek (1632-1723) designed a single -lens microscope small . Microscope was used to observe the straw soaking water . He found that moving organisms in the water , which was then called bacteria . Antonie van Leeuwenhoek was the first to discover the living cell .
Leeuwenhoek microscope
The development of discoveries about cells induce the development of the perception of the cell . From this he went on theories about the cell . Some theories about the cell as follows .
a. Unity Is a cell or Structural Unit of Living Things
This theory was put forward by Jacob Schleiden (1804-1881) and Theodor Schwan ( 1810-1882 ) . Schleiden 1839 , the German botanist , make observations of the microscopic plant cells . At the same time Theodor Schwan observations of animal cells . From their observations draw the following conclusion .
1 ) Every living thing is composed of cells .
2 ) The cell is the smallest structural unit of living beings .
3 ) a single -celled organism is composed of a cell , other organisms are composed of more than one cell called a multicellular organism .
b . Functional unit cell As Sentient Beings
Max Schultze (1825-1874) stated that protoplasm is the physical basis of life . Protoplasm is not only the structural part of the cell, but also an important part of the cell as a place of ongoing chemical reactions of life . Based on this theory comes the cells which states that the cell is the functional unity of life .
c . As the unit cell of Living Growth
Rudolph Virchow (1821-1902) Omnis cellula ex found cellulae ( all cells come from cells previously ) .
d . Heredity unit cell As Sentient Beings
Science and technology promotes discovery units of inheritance contained in the nucleus , the chromosomes . In the chromosomes are genes that are hereditary units . Through this discovery came the theory that the cell is the unit of heredity of living beings . Findings that support the development of the cell theory as follows .
- Robert Brown ( 1812 ) , the Scottish biologist , discovered a small object floating in the liquid cell which he called the nucleus .
- Felix Durjadin ( 1835 ) , assumed that the most important part of the cell is the cell fluid is now called protoplasm .
- John Purkinye ( 1787-1869 ) , the first to propose the term protoplasm to name the egg embryonic material .
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