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Louis Pasteur. By Jaekyung Song 9G. Biography. Born on December 27 th , 1822 Born in Jura Grew up in Arbois Jean Pasteur, his father, was a veteran of the Napoleonic Wars His headmaster suggested that he go to École Normale Supérieure Married Marie Laurent

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Louis pasteur

Louis Pasteur

By Jaekyung Song

9G


Biography
Biography

  • Born on December 27th, 1822

  • Born in Jura

  • Grew up in Arbois

  • Jean Pasteur, his father, was a veteran of the Napoleonic Wars

  • His headmaster suggested that he go to ÉcoleNormaleSupérieure

  • Married Marie Laurent

  • Had five children, only two survived to adulthood


His first discovery
His First Discovery

  • “Pasteur's professors and fellow students were heavily involved in the study of crystals (clear, colorless glass) and their effects on light. Pasteur himself quickly focused on the study of crystals suspended in tartaric and racemic acids (both of which are formed in the process of making wine). His doctoral research led him to his first major discovery. While tartaric and racemic acids have identical chemical structure, the crystals in the two have different effects on polarized light. Pasteur was curious about how this could be, given their identical chemical structure. A closer study of both acids led Pasteur to the realization that racemic acid contained two different crystals: one was chemically identical to those in tartaric acid, the other had a chemical structure that was the mirror image of the former. This structural difference accounted for their different effects on light. It was this discovery of mirror-image molecules that first established Pasteur's scientific reputation.”


What it means
What It Means

  • Pasteur was curious of acids on crystals and light

  • Put crystals into two different acids: Tartaric and racemic acid

  • Even though the two acids had similar chemical structure, the crystal would have different effects on polar light when put in different acids

  • Closer study revealed that racemic was made of 2 crystals: a crystal similar to Tartaric, and a mirror image of the former

  • Discovery of mirror image molecules boosted his reputation


His second discovery
His Second Discovery

  • “Because of the notoriety of Pasteur's research on tartaric and racemic acids, he was approached by a local factory owner who hoped that the scientist could help him with the fermentation and preservation of his product, beet juice. The research that Pasteur embarked on for the factory owner led to his second major discovery. Up until that time, scientists had believed that yeast acted as a chemical catalyst during the process of fermentation, causing the breakdown of complex sugar molecules into simpler sugars. Pasteur concluded that yeast was not an inorganic catalyst but a living organism that consumed sugar in beet juice, leaving alcohol as a waste product. Pasteur also concluded that the juice went sour when other microorganisms, bacteria, fermented sugar into lactic acid.”


What it means1
What It Means

  • Found yeast is not a catalyst

  • Yeast is alive and eats sugars and leaves behind alcohol through fermentation

  • Bacteria makes food go sour


Some of his experiment
Some of His Experiment

  • 1. “First, Pasteur prepared a nutrient broth similar to the broth one would use in soup.”

  • 2. “Next, he placed equal amounts of the broth into two long-necked flasks. He left one flask with a straight neck. The other he bent to form an "S" shape.”





  • 6. “If spontaneous generation had been a real phenomenon, Pasteur argued, the broth in the curved-neck flask would have eventually become reinfected because the germs would have spontaneously generated. But the curved-neck flask never became infected, indicating that the germs could only come from other germs.”


  • “Pasteur separated the left and right crystal shapes from each other to form two piles of crystals: in solution one form rotated light to the left, the other to the right, while an equal mixture of the two forms canceled each other's rotation. Hence, the mixture does not rotate polarized light.”



Description of his work
Description of His Work against two deadly diseases—anthrax and rabies.”

  • His work is similar to every other scientist; he follows the scientific method


Effects on society
Effects on Society against two deadly diseases—anthrax and rabies.”

  • The cure saved many people

  • Advanced research of microbiology

  • Won Leeuwenhoek medal

  • Is a Grand Croix of the Legion of Honor


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