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  • Patterns in the Distribution of Lactase Persistence

    Patterns in the Distribution of Lactase Persistence

    Activity

    Students explore the geographic distribution of lactase persistence around the world by analyzing real data collected by scientists.

  • Mimicry in a Diverse Community of Arthropods

    Mimicry in a Diverse Community of Arthropods

    Data Point

    Researchers exposed arthropod mimics that use a golden patch to warn of unpalatability to predators with different prey preferences to determine how effective their warnings were.

  • Who Am I?

    Who Am I?

    Image of the Week

    The caterpillar of the spicebush swallowtail butterfly (Papilio trollus) mimics the rough green snake (Opheodrys aestivus).

  • Super Stoma

    Super Stoma

    Image of the Week

    The stomata of grasses (singular stoma) function more efficiently than those of other plants.

  • Ecology, Food Webs, and the Chesapeake Bay

    Ecology, Food Webs, and the Chesapeake Bay

    Lecture

    (49 min 3 sec) A discussion of the Chesapeake Bay Watershed, its complex food web, and the challenges of conserving and restoring the bay.

  • Snail Fronts and Salt Marsh Die-Offs

    Snail Fronts and Salt Marsh Die-Offs

    Data Point

    Researchers studied whether periwinkle snail fronts expand mudflats and contribute to salt marsh die-offs.

  • Lionfish Invasion

    Lionfish Invasion

    Image of the Week

    Two species of lionfish, the red lionfish (Pterois volitans) and the common lionfish (Pterois miles), have been established as invasive species off the East Coast of the United States and in the Caribbean.

  • Wash Your Hands

    Wash Your Hands

    Image of the Week

    As few as eighteen of these norovirus particles are sufficient to infect one person.

  • Red Tattoo

    Red Tattoo

    Image of the Week

    A section of stained human skin bearing a red tattoo.

  • Tracking Global Changes in Forest Cover

    Tracking Global Changes in Forest Cover

    Data Point

    Researchers used satellite imagery analyze the amount of forest that was lost annually across the globe between 2000 and 2012.

  • Spiny Cells

    Spiny Cells

    Image of the Week

    A drawing, made by Santiago Ramón y Cajal of pyramidal neurons in the cerebral cortex of a rabbit, documented the presence of dendritic spines on the surfaces of some of the cells.

  • Studying Elephant Communication

    Studying Elephant Communication

    Scientist at Work

    (6 min 43 sec) Elephants can communicate over long distances using low-frequency sounds that travel both in the air and through the ground. Scientists are studying whether elephants can “hear” and interpret these ground vibrations.

  • Tugging The Cellular Heartstrings

    Tugging The Cellular Heartstrings

    Image of the Week

    The microtubules inside cardiomyocytes buckle when the heart contracts.

  • Viral Lysis and Budding

    Viral Lysis and Budding

    Activity

    This activity outlines two demonstrations that model how enveloped and nonenveloped viruses are released from infected cells.

  • 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.

  • Cell Division and Cancer Risk

    Cell Division and Cancer Risk

    Data Point

    Cancer is typically attributed to hereditary and environmental factors, but these only explain a fraction of overall cancer risk. In this study, researchers investigated how a third factor—chance genetic mutations that occur during stem cell division—may contribute to the overall rate of cancer incidence in different body tissues.

  • 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.

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