Spontaneous Generation and Cell Theory 1. Tradition thought is very hard to overcome- even with solid evidence to support new ideas * Social pressure has effect on acceptance of scientific ideas and technological advancements * Science is a social/political enterprise * New ideas often met with resistance * Sometimes ostracisms‚ persecution‚ death * Microscope helped to overturn some strange ideas * Disease processes * "spontaneous
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for greater magnification‚ of upto 200x. This increased magnification and resolution has allowed him to view bacteria‚ and this time the scientific community accepted the findings due to the resolution of the images. In 1838‚ German scientists‚ Theodor Schwann and Mattibias Schleiden‚ discussed the similarities in the animal and plant cells that they were observing through their compound light microscopes. They observed that both cells contained nuclei‚ and this provided them with the basis of their
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Delft‚ Holland and had little or no scientific education. Leeuwenhoek also confirmed the discovery of capillary systems. Theodor Schwann a German physiologist born in Neuss and educated at the universities of Bonn‚ Wurzburg‚ and Berlin‚ Schwann was involved in the study of the structure of plant and animal tissues. Along with Matthias Jakob Schleiden a German botanist‚ Schwann proposed the cell theory. The cell theory has three parts: 1. All organisms are composed of cells. 2. Cells are
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cells? 6. What did Anton van Leeuwenhoek discover? 7. A Scanning Tunneling Microscope (STM) can magnify a specimen up to how many times? 8. What did Matthias Schleiden discover? 9. What did Theodor Schwann discover? 10. What did Rudolf Virchow discover? 11. Who helped develop the cell theory? 12. What does the cell theory state? 13. What is magnification? 14. How do the lenses in light microscopes
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The discovery of cells and their structure is linked to the development of microscopes‚ which allowed scientists to observe microscopic cells. In the mid 1600s‚ in the Netherlands‚ the scientist Antonie van Leeuwenhoek developed the first known microscope using a single magnifying lens. He is described as the first microbiologist because he was the first to observe microscopic cells that we now know to be bacteria and blood cells. Van Leeuwenhoek shared the designs of his microscope‚ as well as his
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animal echolocation). He was the pioneer of the original study of echolocation‚ though his study was limited to what he could observe. Later scientists moved onto studies of the sensory mechanisms and processing of this information. Theordore Schwann seeing
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initial development of the theory‚ during the mid-17th century‚ was made possible by advances in microscopy; the study of cells is called cell biology. Cell theory is one of the foundations of biology.The observations of Hooke‚ Leeuwenhoek‚ Schleiden‚ Schwann‚ Virchow‚ and others led to the development of the cell theory. The cell theory is a widely accepted explanation of the relationship between cells and living things. The three tenets to the cell theory are as described below: All living organisms
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The Cell Theory The Cell Theory‚ formed by Anton van Leeuwenhoek‚ Robert Hooke‚ Matthias Schleiden‚ Theodore Schwann‚ and Rudolf Virchow‚ refers to the idea that cells are the basic unit of structure in every living organism. The theory justifies three principles: all living organisms are composed of one or more cells; the cell is the most basic unit of structure‚ function‚ and organization in all organisms; and all cells come from pre-existing‚ living cells. The formation of the cell theory
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6. “Robust knowledge requires both consensus and disagreement.” Discuss the claim with reference to two areas of knowledge. Robust Knowledge is the knowledge that is relevant and accepted by actors in the context of its application. This is achieved when the knowledge is credible‚ noticeable‚ and produced in a legitimate way. Knowledge is credible when it is accepted globally by a majority and is passed down from person to person. Knowledge is noticeable in everyone’s everyday experience and encounters
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microscope made by Hans and Zacharias Janssen. • 1676 Leeuwenhoek (Dutch) saw micro organisms under a microscope in a drop of pond water. • 1824 Henri Dutrochet (French) suggested that all organisms are composed of cells. • 1838 Schleiden and Schwann (German) further advanced idea that all organisms are made of cells. Increasing evidence. E.g. first researcher to view single yeast cells budding and producing new cells. From that time on‚ cells regarded as building block of life. • 1859 Rudolph
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