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私の名前はアンディです！カリフォルニア出身ています。ビデオゲーム会社で働くソフトウェアエンジニア。よろしくお願いします。 日本を訪問します 日本人と普通に話したい 『I also speak fluent english！』 助ける英語話せます 学びましょう？
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  • Corrected

    Louis Pasteur's experiments

    Hello, today I'd like to talk about Louis Pasteur and his work to deny 'spontaneous generation'.

    'Spontaneous generation' was proposed by Aristotle in the 4th century B.C. 'Spontaneous generation' means that living things come from inanimate objects naturally. It was believed to be true by people all over the world until 16th century. In 1668, Francesco Redi made an experiment to try to deny 'spontaneous generation'. However, it was not sufficient. After the discovery of microorganisms, it became difficult to deny  completely.
    In 1861, Louis Pasteur made an experiment to research relationship between the change of organic material solution and the growth of microorganisms.

    How can 'spontaneous generation' be disproven?

    In 1861, Pasteur conducted an experiment.
    1. He put the air into a tube which was plugged with cotton. After that, microorganisms attached to the cotton.
    2. Microorganisms didn't grow in organic material solution which included heating air. However, they grew in organic material solution which included the cotton.
    3. He made the flask as shown in the figure. He added this solution to the flask and microorganisms didn't grow. However he broke a thin tube of the flask, microorganisms grew.

    Pasteur's work was a tremendous success. He refuted  'spontaneous generation' with the experiments. After that, Tyndall repeated the  experiment and 'spontaneous generation' was refuted completely.
    0 voted
    October 9, 2017
    2
  • Corrected

    presentation 1 please correct it~

    Hello, my name is mondo watanabe, and today i'd like to talk about Hideyo Noguchi and Carlos Finley and his work to research yellow fever.
    Yellow fever is the famous infection in Africa and South America. An infected person suddenly develops fever, headache, and vomiting.
    Carlos Finley, a Cuban doctor said yellow fever is transmitted by mosquitos. After that, Hideyo Noguchi researched this hypothesis and yellow fever.

    Reseach Question
    How is yellow transmitted to many people who live in a different country?

    In 1881 Carlos Finley presented the theory mosquitos transmit yellow fever. After that,  Walter Reed conducted a experiment.

    1. He gathered the blood of the infected patient
    2. He let the egg of the specific mosquito.
    3. He let a mosquito sting a subject.
    4. A few people stung by the mosquito died. 

    Conclusion and Future reseach
    Reed identified the mosquito which transmitted illness and Carlos Finley's theory was proven. 
    After that, Hideyo Noguchi researched more about yellow fever, but he was killed by that illness. Further research into Yellow Fever is needed in the future. 
    0 voted
    October 9, 2017
    1