Leeuwenhoek was also the first person, using a microscope, to observe clearly and to describe red blood cells in humans and other animals, as well as sperm cells.
In addition, he studied the structure of plants, the compound eyes of insects, and the life cycles of fleas, aphids, and ants.1833: English Botanist Robert Brown discovered the nucleus in plant cells.
Even today the study of cells reveals more detail, and its secrets, which are in fact the secrets of life itself, are revealed with ever increasing clarity.
1665: English Scientist and Microscopist Robert Hooke described a honeycomb-like network of cellulae (Latin for little storage rooms) in cork slice using his primitive compound microscope.
Born in Hamburg and educated in law at Heidelberg, Schleiden left law practice to study botany, which he then taught at the University of Jena from 1839 to 1862. Before that time cells escaped notice because of their small size.With the invention of the microscope and its subsequent improvement, cells became visible and many new discoveries were made about them.Cells are organisms and all organisms consist of one or more cells. The cell is the basic unit of structure for all organisms and that plants and animals consist of combinations of these organisms which are arranged in accordance with definite rules In other words, the cell is the basic unit of life.This statement was the second generalization concerning cells and is the most important in the development of biology. Schwann, Theodor (1810-82), German physiologist, generally considered the founder of modern histology, the study of the structure of plant and animal tissues.
Leeuwenhoek was the first person to observe single-celled animals (protozoa) with a microscope.He described them in a letter to the Royal Society, which published his detailed pictures in 1683.1838: Matthias Jakob Schleiden, a German botanist, concluded that all plant tissues are composed of cells and that an embryonic plant arose from a single cell. He declared that the cell is the of all plant matter.In 1662 Hooke was appointed curator of experiments of the Royal Society and served in this position until his death.
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