病原生物的相对大小 Limit of Relative sizes of Meters visibility organisms and viruses Adult roundworm 10-2 mm Helminth 10-3 1,00μmor 1 mm Eye Eukaryotic cell Yeast 100um Bacillus megaterium 1,000 nm or 10-6 1 um Prokaryotic cells Escherichia coli 10 100nm ight mIcroscope Mycoplasma 108 10 nm Virus 109 1 nm Electron microscope病原生物的相对大小