bio 30 timeline assignment

  • 2000 BCE

    water microscope

    the water microscope is invented in china.
  • 1450

    spectacles are invented

    Grinding lenses is invented in Italy and glasses are made to improve vision.
  • Compound microscope invented

    Dutch lens makers Hans and Zacharias Janssen make the first microscope.
  • Cell theory

    The origins of cell theory begin in 1665
  • discovery of cells

    discovery of cells
    In 1665 Robert Hooke discovered cells by looking at a piece of cork with a primitive microscope.
  • Micrographia

    Robert Hooke publishes Micrographia.
  • francesco redi

    francesco redi
    in 1668 Francesco redi attempted to disprove spontaneous generation by placing meats in flasks some of which were sealed. He noted that maggots only existed in the unsealed flasks where flies would be able to enter freely and lay their eggs.
  • discovery of animalcules and bacteria by Anton Van Leeuwenhoek

    In 1674 Anton Van Leeuwenhoek discovers microscopic animalcules and bacteria by looking at water with a telescope.
  • John Needham

    John Needham attempted to prove spontaneous generation by placing broth in a vial, then heating it to kill everything within the vial, and then sealed it. Days later he noted that the presence of life had formed in the broth, and said that it had come from nonlife. However Needham had not heated the vial long enough to kill all the microbes.
  • Lazzaro Spallanzani

    Spallanzani tried to disprove spontaneous generation by taking broth in two separate bottles, boiling, then sealing one bottle and leaving the other open. Days later the opened bottle started to show signs of life which could be observed with the newly invented microscope. the sealed bottle however formed no living organisms.
  • spherical aberration

    In 1830 Joseph Jackson Lister reduces the problem with spherical aberration by putting several weak lenses together
  • Basis for cell theory

    In 1838 and 1839 Matthias Schleiden and Theodor Schwann conducted studies and concluded that that all living things were made up of cells and that a cell is the smallest unit of organization in a living thing.
  • Rudolf Virchow

    In 1858 Rudolf Virchow hypothesized that new cells come from preexisting cells.
  • Pasteurization discovered

    In 1862 Louis Pasteur discovers pasteurization by taking milk and heating it to a certain temperature for a set period of time.
  • louis pasteur disproves spontaneous generation

    louis pasteur disproves spontaneous generation
    Louis Pasteur disproved spontaneous generation by using a special swan neck flask and placing a broth in it. He then boiled the broth to kill all the microorganisms within. Then he allowed the infusion to sit for a while. Because of the shape of the flask the broth was exposed to air. However no microorganisms formed. Then he put some of the broth in the neck of the bottle and then microorgansms began to appear. Proving spontaneous generation does not exist.
  • The Abbe condenser

    The Abbe condenser is invented.
  • wavelength of light

    Ernst Abbe creates a mathematical theory correlating resolution to the wavelength of light.
  • Discovery of cell mitosis and chromosomes

    In 1879 Walter Fleming discovers cell mitosis and chromosomes.
  • Postulates

    In 1885 Robert Koch discovers his famous postulates. the cholera vibrio, anthrax bacillus and the tuberculosis bacillus.
  • Kohler illumination

    Kohler illumination is invented.
  • Phase contrast microscope

    Richard Zsigmondy creates the ultra-microscope
  • first commercial uv microscope is invented.

    In 1904 the first commercial uv microscope is invented.
  • electron microscope

    In 1931 Max Knoll and Ernst Ruska invents the first ever electron microscope.
  • Phase contrast microscope

    Fritz Zernike invents the ultra microscope
  • Electron microscope

    Ernst Ruska creates the electron microscope
  • Scanning electron microscope invented

    In 1942 Ernst Ruska invents the scanning electron microscope.
  • Miller-Ury experiment

    Stanley Miller and Harold Urey. Tried to discover how life originated by conducting an experiment by simulating hypothetical conditions of the early history on earth. They used water, methane, ammonia and hydrogen. After one week they discovered that as much as 10-15% of the carbon within was now in the form of organic compounds.
  • Lynn Margulis

    Lynn Margulis
    Lynn Margulis came up with the theory of endosymbiosis. Endosymbiosis is the theory that explains the origins of chloroplast, mitochondria. And explains how eukaryotic cells came to be.
  • scanning tunneling microscope

    in 1981 the scanning tunneling microscope is invented by gerd Binnig and Heinrich Rohrer