Phase contrast image of serum arrested mouse L-1210 cells engaged in spontaneous apoptosis (programmed cell death) after nutrient depletion and acid hydrolysis. The image was taken at 40X, scanned, an...

A brightfield, multi-focus stack image of a sorus of Asplenium trichomanes (maidenhair spleenwort), a small fern. A sorus is a cluster of sporangia, which produce and contain spores. Honorable Menti...

Phase contrast movie demonstrating how paramecia contractile vacuoles regulate water pressure within the protozoan's body. Water enters through the cell wall by osmosis and then passes through the cyt...

Confocal micrograph of a mast cell in human eye with conjunctivitis. This image shows a single mast cell invading conjunctival tissue in response to an inflammatory agent or pathogen. The mast cell c...

This movie shows a Crane fly Nephrotoma suturalis sperm cell at metaphase of meiosis. Images were captured every 15 seconds for 35 minutes of cell division using polarized light microscopy. Eighth Pr...

Darkfield image of spherical colonies of Nostoc commune, a bluegreen alga. Nostoc commune is a terrestrial species of cyanobacteria that in 1988 was found to harbor a previously unidentified UV-A/B ab...

Confocal micrograph of NIH-3T3 cells co-transduced with 5 fluorescent proteins. The cells were marked by co-transduction with Lentiviral Gene Ontology (LeGO) vectors expressing Cerulean (cyan), EGFP ...

A video of Arabidopsis thaliana showing a lateral root growing out of the primary root. Arabidopsis thaliana is widely used as a model organism in plant biology. This movie is created from image sta...

Live green brain coral (Goniastrea) under water. Most corals consist of many small polyps living together in a colony. One full polyp in the center is shown with four surrounding polyps. Walled coral...

Adult mouse hippocampus, a region of the brain involved in learning and memory, showing reactive astroglia (pale yellow) that have proliferated and enlarged in response to neuronal activity over time....