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- heavy, very transparent flint glass that simulates the fire and brilliance of gemstones because it has relatively high indices of refraction and strong dispersion (separation of white light into its component colours). From a very early period the imitation of ...
- pastel
- dry drawing medium executed with fragile, finger-size sticks. These drawing crayons, called pastels, are made of powdered pigments combined with a minimum of nongreasy binder, usually gum tragacanth or, from the mid-20th century, methyl cellulose. Made in a wide range ...
- Pasternak, Boris Leonidovich
- Russian poet whose novel Doctor Zhivago helped win him the Nobel Prize for Literature in 1958 but aroused so much opposition in the Soviet Union that he declined the honour. An epic of wandering, spiritual isolation, and love amid the ...
- Pasteur, Louis
- French chemist and microbiologist whose contributions were among the most varied and valuable in the history of science and industry. It was he who proved that microorganisms cause fermentation and disease; he who originated and was the first to use ...
- Pasteurella
- genus of rod-shaped bacteria that causes several serious diseases in domestic animals and milder infections in humans. The genus was named after Louis Pasteur. Its species are microbiologically characterized as gram-negative, nonmotile, facultative anaerobes (not requiring oxygen) that have a ...
- pasteurization
- heat-treatment process that destroys pathogenic microorganisms in certain foods and beverages. It is named for the French scientist Louis Pasteur, who in the 1860s demonstrated that abnormal fermentation of wine and beer could be prevented by heating the beverages to ...
- Pasto
- city, capital of Narino department, southwestern Colombia, situated 8,291 feet (2,527 m) above sea level at the base of Galeras Volcano (14,029 feet [4,276 m]). Founded in 1539, Pasto was a royalist stronghold during the revolution against Spain. Although now ...
- Paston Letters
- the largest surviving collection of 15th-century English correspondence. It is invaluable to historians and philologists and is preserved mainly in the British Museum. Part is derived from the circle of the career soldier Sir John Fastolf (c. 1378-1459), and part ...
- Pastor, Ludwig, Freiherr Von Campersfelden
- German author of one of the monumental papal histories, Geschichte der Papste seit dem Ausgang des Mittelalters, 16 vol. (1886-1933; History of the Popes from the Close of the Middle Ages).
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