These Closterium algae are elongate desmids formed by two hemicells that are mirror images of each other. Although there is only a single central nucleus, each semicell has one or two axial, ridged c...

Scanning electron microscope image of longitudinal section of Oryza sativa (rice) stem. Image shows cuts through the vascular cells and cortex cells. Starch granules are visible inside the vascular ce...

Rendered 3D projection of a confocal z-series taken of rhizome (underground portion of the stem) of Convallari majalis (Lily of the Valley). The green objects represent reconstructed chloroplasts; ce...

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...

Electron micrograph of corn stunt spiroplasma (CSS, Spiroplasma kunkelii, Class Mollicutes) in sieve elements and other phloem cells of infected maize leaves. CIL:19124, from the same image group, is ...

This is a region of a (semithin) longitudinal section of onion root taken from the meristematic zone; this is the undifferentiated region of plant tissue from which new cells are formed. Therefore, it...

Mouse zona pellucida. This image shows a zona pellucida surrounding a mouse oocyte. The sample has been labeled with an antibody to ZP3, one of the three glycoproteins in the zona pellucida. The image...

A light micrograph of a thin slice through a cup fungus called Peziza. It grows on decaying wood and organic matter and reproduces itself by producing ascospores. This section shows the fungus' spore ...

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...

Electron micrograph of corn stunt spiroplasma (CSS, Spiroplasma kunkelii, Class Mollicutes) in sieve elements and other phloem cells of infected maize roots. CIL:19125, from the same image group, is a...