T4 bacteriophage. Coloured transmission electron micrograph (TEM) of T4 bacteriophage viruses. The swollen structures are their heads,which contain DNA (deoxyribonucleic acid) inside a protein coat. Attached to these are their tails,consisting of a tube-like sheath and fine tail fibres. T4 bacteriophages are parasites of Escherichia coli,a bacteria common in the human gut. The virus attaches itself to the host bacteria cell wall by its tail fibres; the sheath then contracts,injecting the DNA into the host. The viral DNA makes the bacteria manufacture more copies of the virus. Negatively stained. Magnification unknown | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / DR LINDA STANNARD, UCT |
Taille de l’image : | 3300 px × 2369 px |
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