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In 2013, the fifth chapter "Virus" ppt courseware of the Eighth Edition of the Autumn Edition of the Eighth Edition can only be seen under an electron microscope, and only nanometers can be used to represent organisms of size. At the end of the 19th century, Russian scientist Ivanovsky discovered that the causative agent of tobacco mosaic disease can pass through the pores of the bacterial filter that various types of bacteria could not pass at that time, that is, the diseased tobacco juice passed through the bacterial filter He was still infectious afterwards, which he called a "filtered virus". In the early 20th century, scientists observed real viruses with an electron microscope.
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