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communicable diseases

(Encyclopedia)communicable diseases, illnesses caused by microorganisms and transmitted from an infected person or animal to another person or animal. Some diseases are passed on by direct or indirect contact with ...

acculturation

(Encyclopedia)acculturation, culture changes resulting from contact among various societies over time. Contact may have distinct results, such as the borrowing of certain traits by one culture from another, or the ...

Leeuwenhoek, Antony van

(Encyclopedia)Leeuwenhoek, Antony van änˈtōnē vän lāˈvənho͞okˌ [key], 1632–1723, Dutch student of natural history and maker of microscopes, b. Delft. His use of lenses in examining cloth as a draper's a...

Yerkes Observatory

(Encyclopedia)Yerkes Observatory, astronomical observatory located in Williams Bay, Wis., on the shore of Lake Geneva. It was founded in 1892 with funds provided by Charles T. Yerkes and its first director was Geor...

Stanhope, Charles Stanhope, 3d Earl

(Encyclopedia)Stanhope, Charles Stanhope, 3d Earl stănˈəp [key], 1753–1816, British politician and inventor; grandson of the 1st earl. He was a friend of the younger William Pitt and married (1774) Pitt's sist...

dermatitis

(Encyclopedia)dermatitis dûrˌmətīˈtĭs [key], nonspecific irritation of the skin. The causative agent may be a bacterium, fungus, or parasite; it can also be a foreign substance, known as an allergen. Contact ...

thermography

(Encyclopedia)thermography thûrˌmŏgˈrəfē [key], contact photocopying process that produces a direct positive image and in which infrared rays are used to expose the copy paper. In a specially designed machine...

Helmholtz, Hermann Ludwig Ferdinand von

(Encyclopedia)Helmholtz, Hermann Ludwig Ferdinand von hĕrˈmän lo͞otˈvĭkh fĕrˈdēnänt fən hĕlmˈhôlts [key], 1821–94, German scientist. Although known especially as a physicist and biologist, he was al...

Millett, Kate

(Encyclopedia)Millett, Kate (Katharine Murray Millett), 1934–2017, American feminist author and activist, b. St. Paul, Minn., B.A. Univ. of Minn., 1956, M.A. Oxford, 1958, Ph.D. Columbia, 1968. Her pioneering fem...

spectroscope

(Encyclopedia)spectroscope, optical instrument for producing spectral lines and measuring their wavelengths and intensities, used in spectral analysis (see spectrum). When a material is heated to incandescence it e...