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Hans and Zacharias Janssen
Transcript of Hans and Zacharias Janssen
Matthias Schleiden 1838
1)Matthias Schleiden discovered the plants were made up of cells
2) he wrote Contributions to Phytogenesis, in which he stated that the different parts of the plant organism are composed of cells.
3) Matthias Jakob Schleiden created what is called the cell theory. The cell theory states that all living things are made up of one or more cells.
Rudolph Virchow 1855
1)Rudolf Virchow published his now-famous aphorism omnis cellula e cellula ("every cell stems from another cell"). He also stated that all diseases involve changes in normal cells.
2)He set out methods and objectives of pathology and demonstrated that cell theory applied to diseased tissue as well as healthy
3)Rudolph Virchow suggested that all cells come from pre-existing cells. Even if the process was not fully understood then.He also stated that not all plants are made up of cells,which eventually lead to the creation of the cell theory.
Anton van Leeuwenhoek 1676-1683
1) Anton van Leeuwenhoek built and improved microscopes. While observing pond water he discovered single-celled organisms that he called animalcules. He also was one of the first people to observe bacteria cells. This contributed to the cell theory by discovering organisms with one cell
2) 1683 Anton van Leeuwenhoek discovered bacteria from a sample of saliva from his mouth
3) Anton Van Leeuwenhoek used microscopes to view pond organisms, bacteria and blood cells. He made careful sketches of what he observed.
robert hooke 1665
1) Hooke viewed a thin cutting cork he discovered empty spaces contained by walls, and termed them pores, or cells
2) Hooke calculated the number of cells in a cubic inch to be 1,259,712,000
3) Later Hooke started studing plants and came up with the idea of cells. This is the biggest contribution to the cell theory because without Hooke cells may not have been discovered for hundreds of more years.
Theodor Schwann Schwann 1836
1)Stated all animal tissues are made of cells,wrote first 2 parts of cell theory.
2) His many contributions to biology include the development of cell theory, the discovery of Schwann cells in the peripheral nervous system, the discovery and study of pepsin.
3)yeast were tiny plant-like organisms, and suggested that fermentation was a biological process.
Hans and Zacharias Janssen 1595
1) Hans and Zacharias Janssen were known for inventing the compound optical microscope. This contributed to the cell theory by making it easier and more practical to observe cells.
2) Hans and Zacharias Janssen produced the first compound microscope by combining two convex lenses within a tube
3)Hans and Zacharias Janssen Cell Theory was first discovered after they developed the microscope.
Robert brown 1831
Louis Pastaur 1864
1) Louis Pasteur contributed to the cell theory by disproving spontaneous generation. He was the first scientist to prove that cells can only form from pre-existing cells.
2) He did this by creating an experiment that showed cells would only grow in broth if air was exposed.
3) Louis Pasteur did an experiment that determined that soup exposed to air only spoiled if the air was not filtered
August Weismann 1889
1)Robert Brown was a well known Scottish botanist. He discovered the cell nucleus while looking at a plant cell. This was a contribution to the cell theory because it showed that all living things were made of one or more cells.
2) Robert was a palaeobotanist who made important contributions to botany largely through his pioneering use of the microscope.
3) His contributions include one of the earliest detailed descriptions of the cell nucleus and cytoplasmic streaming, the first observation of Brownian motion,early work on plant pollination and fertilisation,
1) Francesco Redi, an Italian physician, did an experiment to determine if rotting meat turned into flies. He found that meat cannot turn into flies and only flies could make more flies.
2)This was an important experiment because it helped to disprove the theory of spontaneous generation. It did this by showing that the rotten meat did not turn into flies and only flies could make more flies.
3)he may rightly be called the father of modern parasitology, and also regarded as the founder of experimental biology
1) August Weismann extended or "updated" the cell theory expansion from Virchow, telling that the cells have "evolution".
2)The cell theory was rejected, but Pasteur came in with his experiments of the multiplication of microorganisms, the theory was accepted.
3) August main contribution was the germ plasm theory, according to which (in a multicellular organism) inheritance only takes place by means of the germ cells
Ernst abbe 1846
1) Ernst Abbe developed a mathematical formula that allowed the calculation of the maximum possible magnification that an optical microscope could produce. He called it the Abbe Sine Condition.
2)The microscopes that Abbe and Zeiss produced based on Abbe’s calculations were the first ever built on a sound mathematical understanding of the optics of microscopy lenses.
3)When Abbe and Zeiss partnered with Otto Schott and developed new methods of eliminating optical flaws from the apochromat was born.
Joseph Jackson Lister 1830
1) He showed that multiple lenses with much less curvature could be assembled in such a way as to reduce spherical and chromatic aberration, and development of the compound microscope began in earnest.