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Showing 1-20 of 119 Resources
  • EarthViewer

    EarthViewer

    Click & Learn

    Download the accompanying student worksheet under "Downloads." What did Earth look like 250 million years ago? Or 1 billion years ago? Or 4.5 billion years ago? EarthViewer is an interactive tool that allows you to explore the science of Earth's deep history.

  • Top Notch Model Organism

    Top Notch Model Organism

    Image of the Week

    Close-up of cells in a fruit fly eye at the pupal stage stained with antibodies to the Notch protein.

  • Firefly Pyrotechnics

    Firefly Pyrotechnics

    Image of the Week

    Most firefly species employ characteristic patterns of bioluminescent flashes to elicit responses from potential mates.

  • Asteroid Impact?

    Asteroid Impact?

    Image of the Week

    A living foraminifer, Orbulina universa, in the act of shortening its spines in preparation for gametogenesis.

  • HIV Protease Inhibitors

    HIV Protease Inhibitors

    Activity

    This demonstration models how the HIV protease enzyme functions and how its activity is blocked by a class of anti-HIV drugs.

  • HIV Life Cycle Activities

    HIV Life Cycle Activities

    Collection

    A collection of activities and demonstrations focusing on various aspects of the human immunodeficiency virus (HIV) life cycle. They are designed to be completed individually or as part of the series...

  • Viral DNA Integration

    Viral DNA Integration

    Activity

    In this hands-on activity, students model how a double-stranded DNA copy of the HIV genome is integrated into the host cell DNA.

  • HIV Reverse Transcription and AZT

    HIV Reverse Transcription and AZT

    Activity

    Students model how the anti-HIV drug AZT (azidothymidine) interferes with the process of viral replication.

  • HIV Receptors and Co-receptors

    HIV Receptors and Co-receptors

    Activity

    This demonstration models the first step of the HIV life cycle: the binding of HIV envelope proteins to receptors on human helper T cells.

  • Sound and Vision

    Sound and Vision

    Image of the Week

    A mass of cells surrounded by blood vessels visualized in a living mouse using photoacoustic imaging.

  • Designer Proteins

    Designer Proteins

    Image of the Week

    Scientists are custom-designing proteins, like these nanocages with many green fluorescent proteins attached

  • Eat Your Vitamins

    Eat Your Vitamins

    Image of the Week

    Ascorbic acid, or Vitamin C, is an essential component of the human diet.

  • Fellowship of the Rings

    Fellowship of the Rings

    Image of the Week

    The nuclear pore is a complex of three rings of proteins that controls the passage of materials in and out of the nucleus.

  • Written in Chalk

    Written in Chalk

    Image of the Week

    The world’s chalk deposits are made of fossilized remains of the shells of tiny microscopic algae.

  • Ocean Acidification

    Ocean Acidification

    Activity

    In this hands-on activity, students simulate the effects of decreasing pH caused by rising levels of atmospheric carbon dioxide.

  • Trojan Micro Horses

    Trojan Micro Horses

    Image of the Week

    Spheres made from sugar polymers hide insulin-producing cells from attack by the immune system.

  • Bird's Eye View

    Bird's Eye View

    Image of the Week

    Unlike the human retina, in which red and green cones are randomly distributed, the five cone types of the bird’s retina are arranged in a highly regular mosaic.

  • The Shy Shark's Secret

    The Shy Shark's Secret

    Image of the Week

    The Chain catshark (Scyliorhinus retifer) fluoresces bright green when illuminated in blue light.

  • Efficacy of a Treatment for Chronic Myeloid Leukemia

    Efficacy of a Treatment for Chronic Myeloid Leukemia

    Data Point

    Dr. Brian Druker and colleagues monitored white blood cell counts in six patients with chronic myeloid leukemia treated with the drug, STI571, which blocks the activity of the cancer-causing tyrosine kinase BCR-ABL.

  • To Brine, Or Not To Brine?

    To Brine, Or Not To Brine?

    Image of the Week

    Soaking your Thanksgiving turkey in a salt solution (brine) alters the arrangement of muscle fiber protein molecules.

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