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Showing 1-80 of 1066 Resources
  • Maternal Microbiota Impacts Offspring Immune System

    Maternal Microbiota Impacts Offspring Immune System

    Data Point

    In this study, scientists compared two populations of pregnant mice, one which was kept germ-free throughout pregnancy and the other which was exposed during pregnancy to a strain of E. coli to determine whether the immune systems of offspring begin to develop in utero.

  • Walk On

    Walk On

    Image of the Week

    One of the last wolf pups born on Isle Royale National Park in 2009.

  • New Brain Resolution

    New Brain Resolution

    Image of the Week

    A network of neurons in the brain of a mouse imaged using a novel microscopy technique.

  • Infection Engines

    Infection Engines

    Image of the Week

    A group of intracellular tachyzoites of the toxoplasmosis-causing parasite Toxoplasma gondii.

  • Seed Dispersal in Tropical Forests

    Seed Dispersal in Tropical Forests

    Activity

    In this activity, students use data from published studies to understand patterns of seed dispersal and apply these ideas to the design of a conservation area.

  • Role of p53 in the Cell Cycle

    Role of p53 in the Cell Cycle

    Data Point

    Researchers investigated the role of p53 in cell cycle regulation by genetically engineering a cell line with deleted copies of the p53 gene. They exposed the cell lines to DNA-damaging radiation and observed how this exposure impacted mitosis.

  • The Search for a Mutated Gene

    The Search for a Mutated Gene

    Scientists at Work

    (8 min 54 sec) How do you identify the disease-causing mutation in a patient with an inherited disease? This video illustrates the steps involved—testing for genes that are the “usual suspects,” searching for mutations in novel genes, and assessing links between genotype and phenotype.

  • I Contain Multitudes: The Series

    I Contain Multitudes: The Series

    Collection

    I Contain Multitudes offers a new lens on life. With an eye on microbes—microscopic single-celled organisms—larger creatures such as ourselves suddenly look very different. Each of us is a more of a...

  • A Wasp Mom’s Gift: Blankets of Bacteria

    A Wasp Mom’s Gift: Blankets of Bacteria

    Feature Film

    (9 min 10 sec) You don’t want to be a honeybee when the beewolf is on the prowl.

  • Mosquitoes Might SAVE Lives, Thanks To Bacteria

    Mosquitoes Might SAVE Lives, Thanks To Bacteria

    Feature Film

    (9 min 4 sec) Dengue fever is a deadly mosquito-borne virus that plagues the earth, but science is inching closer to an unlikely solution: bacteria.

  • How Giant Tube Worms Survive at Hydrothermal Vents

    How Giant Tube Worms Survive at Hydrothermal Vents

    Feature Film

    (10 min 20 sec) Deep at the bottom of the Pacific Ocean, an amazing bacterial discovery reshaped our view of life on earth.

  • Superbugs That Resist Antibiotics Can Evolve in 11 Days

    Superbugs That Resist Antibiotics Can Evolve in 11 Days

    Feature Film

    (8 min 50 sec) Antibiotics like penicillin have a critical role in medicine, but using them is not a decision to be taken lightly.

  • Termites Digest Wood Thanks To Microbes

    Termites Digest Wood Thanks To Microbes

    Feature Film

    (7 min 11 sec) The next time you spot a termite chomping down on wood, know that they’re not dining alone.

  • Fountains of Life

    Fountains of Life

    Image of the Week

    Densely packed endosymbiotic bacteria (Endoriftia persephone) in the trophosome of a tube worm living in a deep-sea hydrothermal vent.

  • Modeling Food Webs in Darién, Panama

    Modeling Food Webs in Darién, Panama

    Activity

    Students use cards to build model food webs and evaluate how ecological disturbances affect each trophic level. Also available in Spanish.

  • Snow Seeds

    Snow Seeds

    Image of the Week

    Snowflakes are generated when ice builds up on either dust particles or microorganisms in the atmosphere.

  • Friend and Foe

    Friend and Foe

    Image of the Week

    Endosymbiotic Wolbachia bacteria inhabit the germline tissue of the parasitic nematode, Brugia pahangi.

  • Genes as Medicine

    Genes as Medicine

    Short Film

    (17 min 16 sec) Watch the story of how gene therapy restored the sight of a nearly-blind young patient. Told from the perspective of two researchers who spent over 25 years working to develop this breakthrough technology, this short film chronicles their successes and challenges, and illustrates how the method works to treat inherited conditions.

  • Origins of Antibiotic Resistance

    Origins of Antibiotic Resistance

    Data Point

    Scientists collected bacteria from locations that had never been exposed to humans or modern antibiotics to determine if antibiotic resistance is newly evolved since the introduction of antibiotics or has evolved independently.

  • The Secret Life of Beewolves

    The Secret Life of Beewolves

    Image of the Week

    Cross-section through the antenna of a female beewolf, Philanthinus quattuordecimpunctatus.

  • Identifying the Key Genes for Regeneration

    Identifying the Key Genes for Regeneration

    Scientists at Work

    (9 min 55 sec) Planarians have an amazing ability to regenerate lost tissues. In this video, scientists knock out two different genes in planaria to start to understand how the process works—and they generate animals with two heads and two tails!

  • Stalking the Genetic Basis of a Trait

    Stalking the Genetic Basis of a Trait

    Activity

    In this activity students analyze data on the expression of the tb1 gene and use it to formulate an explanation as to how a specific difference in the corn version of the gene explains the phenotype of less branching.

  • The Beak of the Fish

    The Beak of the Fish

    Image of the Week

    The teeth of adult pufferfish are fused to form a beak used for crunching into hard prey such as shellfish.

  • Evolution At Warp Speed

    Evolution At Warp Speed

    Image of the Week

    Understanding the mechanisms of antibiotic resistance by bacteria is essential in the war against scary superbugs.

  • Vertebrate Declines and the Sixth Mass Extinction

    Vertebrate Declines and the Sixth Mass Extinction

    Data Point

    In this study, researchers measured species population declines on a global scale that may contribute to the sixth mass extinction.

  • BiomeViewer

    BiomeViewer

    Click & Learn

    An interactive to explore biomes, climate, biodiversity, and human impacts across the globe.

  • Eating Wood

    Eating Wood

    Image of the Week

    A soldier Dampwood termite (Zootermopsis nevadensis) in a nest gallery.

  • 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.

  • Virus Hunters: Epidemiology of Nipah Virus

    Virus Hunters: Epidemiology of Nipah Virus

    Activity

    In this activity, students will be exploring cases of Nipah virus (NiV) infection as an epidemiologist would, by collecting evidence and making calculations and predictions, based on scientific data.

  • Central Dogma and Genetic Medicine

    Central Dogma and Genetic Medicine

    Click & Learn

    This interactive uses the central dogma as a model for exploring how modern molecular biology technologies can be used to treat genetic diseases.

  • With A Little Help From My Microbiome

    With A Little Help From My Microbiome

    Image of the Week

    Koalas are able to spend most of their lives in the relative safety of eucalypt trees by virtue of a digestive system adapted to eating their leaves.

  • Fellow Travelers

    Fellow Travelers

    Image of the Week

    The human body is home to some thirty-nine trillion microbes that live in or on it.

  • What van Leeuwenhoek Saw

    What van Leeuwenhoek Saw

    Activity

    This hands-on activity helps students understand concepts related to building scale models by using cards of microorganisms and cells that were first visualized by Antonie van Leeuwenhoek.

  • Predator-Prey Relationship Dynamics

    Predator-Prey Relationship Dynamics

    Data Point

    In a study in Greenland, scientists examined whether changes in population densities of Arctic fox are related to changes in population densities of its main prey, the lemming.

  • Visualizing New Worlds

    Visualizing New Worlds

    Image of the Week

    Frederic Edwin Church’s oil painting, “The Heart of the Andes” caused quite a stir when it was unveiled in New York on April, 27, 1859

  • 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.

  • Polychromatic EM

    Polychromatic EM

    Image of the Week

    A new technique for labeling proteins and other molecules allows them to be clearly visualized and localized in cells in color using electron microscopy.

  • Tracking Genetically Modified Mosquitoes

    Tracking Genetically Modified Mosquitoes

    Activity

    Genetically modified mosquitoes have been used to reduce mosquito populations and the diseases they spread. But how can we tell if the method works? In this activity, students analyze data from a field experiment.

  • Microbial Community Response to an Oil Spill

    Microbial Community Response to an Oil Spill

    Data Point

    Researchers monitored the succession of the microbial community in the Gulf of Mexico using data from before, during, and after the Deepwater Horizon oil spill.

  • Population Dynamics

    Population Dynamics

    Click & Learn

    Explore the exponential and the logistic growth mathematical models that describe how population changes with time.

  • Portrait of a Howler

    Portrait of a Howler

    Image of the Week

    Groups of black howler monkeys (Alouatta caraya) “howl” to each other in the Amazon rainforest during the evening and early morning hours in order to maintain neighborly distances.

  • Benefits of Schools

    Benefits of Schools

    Image of the Week

    Being in a school affords young barracuda several advantages over the solitary life.

  • Developing an Explanation for Mouse Fur Color

    Developing an Explanation for Mouse Fur Color

    Activity

    Students collect and analyze evidence for each of the major conditions for evolution by natural selection to develop an explanation for how populations change over time. 

  • 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.

  • Using Wolbachia to Suppress Mosquito Fertility

    Using Wolbachia to Suppress Mosquito Fertility

    Data Point

    In this study, researchers tested whether releasing Wolbachia-infected male Aedes albopictus (Asian tiger mosquitoes) would suppress populations of this mosquito species in their study area.

  • How Lizards Find Their Way Home

    How Lizards Find Their Way Home

    Scientists at Work

    (8 min 33 sec) When Dr. Manuel Leal removed lizards from an area in the forest, he noticed an interesting phenomenon: all the lizards seemed to be back the next day. Watch as he sets up an experiment to study how these lizards navigate home. Also available in Spanish.

  • Dad Feathers

    Dad Feathers

    Image of the Week

    The male peafowl, or peacock, invests a lot in his appearance.

  • Seed Dispersal and Habitat Fragmentation

    Seed Dispersal and Habitat Fragmentation

    Scientists at Work

    (8 min 3 sec) Watch researchers follow brown spider monkeys in a tropical forest of Colombia to determine which plant seeds they are dispersing. Seed dispersers are critical to the forest’s ability to grow and regenerate. 

  • Root Movement

    Root Movement

    Image of the Week

    Root tips constantly search the soil for water and nutrients using the power of cell division and elongation.

  • WildCam Darién

    WildCam Darién

    Click & Learn

    Researchers in Darién and Soberanía National Parks use remote trail cameras to study jaguars and their prey. You can contribute to this important research through WildCam Darién, an online citizen science platform.

  • Counting the Rings

    Counting the Rings

    Image of the Week

    An otolith from a lanternfish (Gymnoscopelus nicholsi) is used to estimate the fish’s age and growth rate.

  • Sleep Clears β-amyloid from the Brain

    Sleep Clears β-amyloid from the Brain

    Data Point

    The researchers in this study tested whether the rate of Aβ removal is higher during sleep using mice as model organisms.

  • Dragon Tale

    Dragon Tale

    Image of the Week

    A pangolin rescued from poachers near Gorongosa National Park, Mozambique.

  • Modeling Trophic Cascades

    Modeling Trophic Cascades

    Activity

    Students use cards of animal and plant species to model trophic cascades. Species examples are drawn from seven different habitats to test student understanding.

  • Single Mother

    Single Mother

    Image of the Week

    A queen bee may produce as many as 60,000 offspring during her lifetime.

  • Trophic Cascades in Salt Marsh Ecosystems

    Trophic Cascades in Salt Marsh Ecosystems

    Scientists at Work

    (10 min 1 sec) Ecologist Brian Silliman uses manipulative field experiments to reveal that salt marsh ecosystems are under top down control from consumers and predators.

  • Larval Biscuit

    Larval Biscuit

    Image of the Week

    A pluteus larva of the sea biscuit, Clypeaster subdepressus, an echinoderm closely related to sea urchins.

  • Riverine Food Webs – How Flow Rates Affect Biomass

    Riverine Food Webs – How Flow Rates Affect Biomass

    Scientists at Work

    (9 min 15 sec) Ecologist Mary Power studies the Eel River in Northern California to figure out the connection between river flows and biodiversity.

  • 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

    Scientists 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.

  • 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.

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