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  • A Model Microbe

    A Model Microbe

    Image of the Week

    Tetrahymena thermophila is a freshwater unicellular ciliated protozoan related to Paramecium.

  • Dengue Fever

    Dengue Fever

    Image of the Week

    A 3D model of the dengue virus reveals a shape like a soccer ball with an outer coating of glycoproteins.

  • Dengue Virus Life Cycle

    Dengue Virus Life Cycle

    Animation

    (4 min 12 sec) Dengue virus has sophisticated mechanisms for entering a cell, for replicating its RNA genome, and for translating proteins.

  • HIV life cycle

    HIV life cycle

    Animation

    (4 min 52 sec) How HIV infects a cell and replicates itself using reverse transcriptase and the host's cellular machinery.

  • AZT blocks reverse transcriptase

    AZT blocks reverse transcriptase

    Animation

    (1 min 46 sec) HIV's reverse transcriptase mistakes AZT for thymidine. Once incorporated, AZT stops reverse transcription.

  • Recombination of Viral Genome

    Recombination of Viral Genome

    Animation

    (3 min 5 sec) When two different strains of influenza infect a single cell, their genetic material can mix freely, resulting in a new third strain of influenza.