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Development of the Cell Theory

Development of the Cell Theory. Biology 11. History. Middle ages - magnifying lenses 1590 – first compound microscope Required to view microscopic organisms 1665 – Hooke discovered cells. Spontaneous Generation. Living organisms could suddenly arise from non-living materials

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Development of the Cell Theory

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  1. Development of the Cell Theory Biology 11

  2. History • Middle ages - magnifying lenses • 1590 – first compound microscope • Required to view microscopic organisms • 1665 – Hooke discovered cells

  3. Spontaneous Generation • Living organisms could suddenly arise from non-living materials • Believed until 19th century • Maggots on rotting meat • Frogs & salamanders appear in mud • Mushrooms on logs • Mice from a dirty shirt & wheat

  4. Four Parts of the Cell Theory • All living organisms are composed of one or more cells. • Cells are the basic units of structure and function in all organisms. • All cells are derived from pre-existing cells. • In a multicellular organism, the activity of the entire organism depends on the total activity of its independent cells.

  5. Asking Questions • 500 BC • Ancient Greece supports scholars • Ask questions about life & nature • Seek answers through observations & thought • Not experiments

  6. Aristotle • Greek philosopher • 384 – 322 BC • 334 BC • Classified all living things • Plant or animal • Believed in spontaneous generation

  7. Roger Bacon • English philosopher • 1214 – 1294 • 1268 • First wrote about eyeglasses

  8. Magnifying Images • 1590 • Dutch eyeglass makers • Hans & Zaccharias Janssen • Invented first compound microscope • Used two lenses • Magnified 10x

  9. King Charles II • English monarch • 1602 • Founded “Royal Society of London for the Promotion of Natural Knowledge” • Shared & debated knowledge • Used books, letters, meetings

  10. Robert Hooke • English scientist • 1635 – 1703 • 1665 • Published book – Micrographia • Illustrated cork images from microscope • Coined term “cells” • Empty room-like compartments

  11. Antony van Leeuwenhoek • Dutch scientist • 1632 – 1723 • 1666/1667 • Read Hooke’s book • Designed microscopes • Six times more magnifying power

  12. Francesco Redi • Italian scientist • 1629 – 1697 • 1668 • Experiments disproved spontaneous generation • Maggots do not appear in meat if no contact with flies

  13. Redi’s Experiment

  14. van Leeuwenhoek (… again!) • Wrote letters to Royal Society • 1673/1674 • Described “animalcules” in water • Bacteria & protozoa • Hooke later confirmed findings

  15. … van Leeuwenhoek (… again!) • 1683 • Examined plaque from teeth • “Many very little living animalcules, very prettily a-moving” • Discovered bacteria

  16. John Needham • English naturalist & priest • 1713 – 1781 • 1748 • Experiments supported spontaneous generation

  17. John Needham’s Experiment

  18. Lazzaro Spallanzani • Italian biologist • 1729 – 1799 • 1748 • Experiments disproved Needham & spontaneous generation • Boiled broth longer

  19. 1770’s • Microscope mechanical advancements • Sturdier & easier to use • Not as advanced or clear as van Leeuwenhoek’s

  20. Jane Haldiman • English science writer • 1809 • Developed textbooks about science • Used terms “cell”, “cellular system”, “cell tissue”

  21. Robert Brown • Scottish botanist • 1773 – 1858 • 1831 • All cells contain a nucleus

  22. Matthias Jacob Schleiden • German botanist • 1804 – 1881 • 1838 • Wrote “All plants are made of cells”

  23. Theodor Schwann • German physiologist • 1810 – 1882 • 1839 • Wrote “All animals are made of cells”

  24. Alexander Carl Henrich Braun • German botanist • 1805 – 1877 • 1845 • Wrote “The cell is the basic unit of life”

  25. Jugo von Mohl • German biologist • 1805 – 1872 • 1846/1847 • Described protoplasm (cytoplasm) and cell membrane

  26. William Henry Perkin • English chemistry student • 1838 – 1907 • 1856 • Developed a purple dye • Used to stain slide specimens

  27. Rudolph Virchow • German physiologist • 1821 – 1902 • 1858 • Stated (in short) … “All cells come from pre-existing cells” • Disagree with spontaneous generation

  28. Louis Pasteur • French biologist • 1822 – 1895 • 1860 • Finally disproved spontaneous generation • Living organisms DO NOT come from non-living matter • Prize from Paris Academy of Sciences

  29. Louis Pasteur’s Experiment

  30. Schleiden Plants are made up of cells Schwann Animals are made up of cells Virchow All cells come from other cells Indirect Credit: Hooke Discovery of cells van Leeuwenhoek Microscope improvements Cell Theory Scientists

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