History of Invention Cells

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 .