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bacteriophage

(Encyclopedia)bacteriophage băktērˈēəfājˌ [key], virus that infects bacteria and sometimes destroys them by lysis, or dissolution of the cell. Bacteriophages, or phages, have a head composed of protein, an i...

skin cancer

(Encyclopedia)skin cancer, malignant tumor of the skin. The most common types of skin cancer are basal cell carcinoma, squamous cell carcinoma, and melanoma. Rarer forms include mycosis fungoides (a type of lymphom...

acetylcholine

(Encyclopedia)acetylcholine əsētˌəlkōˈlēn [key], a small organic molecule liberated at nerve endings as a neurotransmitter. It is particularly important in the stimulation of muscle tissue. The transmission ...

Schenker, Heinrich

(Encyclopedia)Schenker, Heinrich hīnˈrĭkh shĕngkˈər [key], 1868–1935, Austro-Polish music theorist. Educated at the Vienna Conservatory, he devoted his life to teaching and research. Schenker developed the ...

nekton

(Encyclopedia)nekton: see marine biology.

plankton

(Encyclopedia)plankton: see marine biology.

benthos

(Encyclopedia)benthos: see marine biology.

zooplankton

(Encyclopedia)zooplankton: see marine biology. ...

lung cancer

(Encyclopedia)lung cancer, cancer that originates in the tissues of the lungs. Lung cancer is the leading cause of cancer death in the United States in both men and women. Like other cancers, lung cancer occurs aft...

march, in music

(Encyclopedia)march, in music, composition intended to accompany marching. The only constant characteristics of a march are duple meter and a fairly simple rhythmic design. In mood, marches range from the moving de...