Sunday 17 April 2011

The Cells (Part 1) For F.Sc

What is emergence and implication of cell theory?
Emergence and implication of cell theory
    Invention of Microscope
     The discovery of the cell is directly with the invention of the microscope. This is because most of the cells are not visible to the naked eye. The most useful microscope was invented by H.Janssen in 1590. This microscope would magnify the object third times. 
 Definition of cell
               The cell can be defined as the structural and functional unit of life. It is the smallest unit which can carry out all activity of life. Cells are the building blocks of complex multicellular organisms.
Cell biology
                The branch of biology which deals with the study of cells is called cell biology. It is one of the modern branches of biology, on which work was started by Robert Hooks (1665). 
Works of Robert Hooks
                  He reported the discovery of cell in his famous publication Micrographia.He took a piece of cork, and cut it into thin slices with the help of a sharp razor and studied them under his self-made compound microscope. He observed that the cork is composed of minutes honey comb like compartment which he termed as cells. Because they reminder him of the cells. Inhabited by monks living in a monastery.
 According to Hooks, cell is an empty space bound by ticks’ walls. Little information was added to this idea in the following century,
Contribution of Lorenz Oaken
                Lorenz Oaken was a germane scientist. In 1805, he suggested that “all living being originates from or consist of vesicles or cells”
Idea of Lamarck
                Jean Baptist de Lamarck (1890) expressed similar idea and suggested that no body can have life, if its constituent parts are not cellular tissues or are not formed by cellular tissues.
Discovery of Nucleus
                 In 1831, Robert brown reported the presence of nucleus in the cell. Due to this discovery Hooks idea about the cell as an empty space was changed. The suggested that cell is not an empty space.  

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