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300
Beginning of Spontaneous Generation
Aristotle had the first ideas of spontaneous generation. He denied that the earth had a beginning, therefore spontaneous generation has always been occuring. Aristotle said that animals of some kinds arise directly from elements and the pneuma of the material. -
Period: 300 to
Spontaneous Generation to Cell Theory
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Jan 1, 1580
Spontaneous Generation Ideas
Jan Baptist van Helmont used experimental techniques to back the theory of Spontaneous Generation. Came up with "recipe" for mice and scorpions. -
Invention of Simple Microscope
Zacharias Jansen invented the first simple single-lens microscope and the compound two-lens microscope which made people actually able to see cells. -
Discovery of the Cell
Robert Hooke discovered and named the cell. -
Discovery of Bacteria
Anton van Leeuwenhoek discovered bacteria by taking a sample of lake water. -
Expansion of Cell Theory
Lorenz Oken was a German naturalist that stated that all organic beings come from and consist of vesicles and cells. This statement contributed to the cell theory. -
Discovery of Cell Nucleus
Robert Brown discovered the nucleus of a cell, broading the knowledge of cells. -
Proposal of Cell Theory
Theodor Schwann and Matthias Schleiden propose the idea of cell theory after studying over cells together. -
Addition to Cell Theory Involving Plants
Matthias Schleiden states that cells are the basic building blocks to plant matter. -
Expansion of Cell Theory to Animals
Theodor Schwann was a master microscopist that stated that all living things are composed of cells. This contributed to the cell theory. -
Cell Sickness and Relation to Other Cells
Rudolf Virchow discovered that a whole organism does not get sick- only certain cells or groups of cells get sick. He also made the observation that every cell stems from another cell. -
Discovery of Tissue Structure in Cellular Terms
Albrecht von Roelliker was the first to interpret the structure of tissue involving cells. He also described mitochondria. This discovery helped scientists better understand the cell structure. -
Disproval of Spontaneous Generation
Louis Pasteur denied and disproved spontaneous generation with his experiment on fermentation.
