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Cell Theory Timeline
Transcript of Cell Theory Timeline
He dissected the bodies of executed criminals to gain knowledge about human anatomy. Vesalius discovered that the jaw is made of one bone and that the septum does not exist.
He thought that a life force existed in all inorganic matter. He made many microscopical observations and said that "anguilles", tiny microscopic animals, could be developed spontaneously by natural forces like water and oxygen. He also experimented by heating chicken broth. At the time, people thought that heat killed all organisms, so Needham heated chicken broth to "kill all the organisms". Then, he allowed the open flask to sit out at room temperature, and organisms began to grow. He credited this to spontaneous generation.
Anton van Leeuwenheok
Dutch microscopist Antony van Leeuwenhoek published his observations of single-cell organisms. It is likely that Leeuwenhoek was the first person to observe a red blood cell and a sperm cell. Leeuwenhoek made numerous and detailed observations on his microorganisms, but more than one hundred years passed before a connection was made between the cellular structure of these creatures and the existence of them in animals or plants.
Robert Hooke studied microscopic
principles and observations and
discovered a structure, which he
named "cells." This he wrote about
in his book 'Micrographia,' published
Hans & Zacharias Janssen
Cell Theory Timeline
by: Gio Williams
This german botanist observed
that all plants were composed
of cells. Along with this he
developed the importance of the
cell nucleus, which was explained
in his book 'Beiträge zur Phytogenesis,'
He discovered the nucleus in the cells of an orchid. He realized that the nucleus is an essential part of living cells.
Oken made a further advance in the application of the a prior principle, in a book on generation (Die Zeugung), in which he maintained that "all organic beings originate from and consist of vesicles or cells."
Jean Baptist Lamarck
Recognized that all living things are made up of cells. "Thus every living body is essentially a mass of cellular tissue."
Spallanzani made many contributions to animal reproduction. He was the first to complete artificial insemination and invetro fertilization. He discovered that all cells come from pre-existing dead cells and microbes can travel through the air.
Redi discovered maggots evolve into flies. To test his theory, he left meat uncovered and found that maggots appeared. With a further study of maggots, he came to the conclusion that they grow into flies. Redi disproved the spontaneous generation theory.
He pioneered the study of molecular asymmetry; discovered that microorganisms cause fermentation and disease; originated the process of pasteurization; saved the beer, wine, and silk industries in France; and developed vaccines against anthrax and rabies.
By discovering that the cell
theory can be used for diseased
tissue as well as healthy tissue,
Rudolf Virchow came up with the
idea that every cell is made from
a pre-existing cell in 1855.
Theodor Schwann proposed that (in animals too) every structural element is composed of cells or cell products. Schwann's contribution might be regarded as the more groundbreaking, since the understanding of animal structure lagged behind that of plants. In addition, he claimed that the fundamental laws governing cells were identical between plants and animals: "A common principle underlies the development of all the individual elementary subunits of all organisms" (Harris 1999, p. 102).
Anton van Leeuwenhoek
1. Andreas Vesalius
2. Hans & Zacharias Janssen
3. Robert Hooke
4. Anton van Leeuwenhoek
5. John Needham
6. Lazzaro Spallanzani
7. Jean Baptise Lamarck
Zacharias Janssen, with the help
of his father Hans Janssen, allowed the observation of organisms,fossils, diatoms and even cells. This was due to his invention of the compound microscope.
8. Lorenz Oken
9. Robert Brown
10. Matthias Schleiden
11. Theodor Schwann
12. Rudolph Virchow
13. Louis Pasteur
14. Francesco Redi
Anton van Leeuwenhoek
Jean Baptiste Lamarck
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