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Cell division in cultured cells.
Differential interference contrast (DIC) microscopy of live human cells. Chromosomes are seen in the central dividing cell. One frame per 10 sec. Magnification 600x.
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Vorticella sp. living in in clusters on the root of Duckweed (Lemna sp.) in west Wales, each stalk is individually attached to the root surface.
The stalk is made up of an external sheath that contains a fluid and a spirally arranged contractile fibril called a myoneme that contracts when stimulated. When disturbed, the vorticella contracts and the stalk thread is shortened,...