deleterious matter

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• Purity — Pu ri*ty, n. [OE. purete, purte, OF. purt[ e], F. puret[ e], from L. puritas, fr. purus pure. See {Pure}.] The condition of being pure. Specifically: (a) freedom from foreign admixture or deleterious matter; as, the purity of water, of wine, of… …   The Collaborative International Dictionary of English

• Doulton Ware —    Sir Henry Doulton (1820 1897) enjoyed the benefits of a good education. He discovered the art of making glazed earthenware, and he revolutionized the field of sanitation. Previously, drains had been mostly channels of bricks, which absorbed… …   Dictionary of eponyms

• evolution — evolutional, adj. evolutionally, adv. /ev euh looh sheuhn/ or, esp. Brit., /ee veuh /, n. 1. any process of formation or growth; development: the evolution of a language; the evolution of the airplane. 2. a product of such development; something… …   Universalium

• radiation — radiational, adj. /ray dee ay sheuhn/, n. 1. Physics. a. the process in which energy is emitted as particles or waves. b. the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and… …   Universalium

• chemical element — Introduction also called  element,         any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.       This article considers the… …   Universalium

• heredity — /heuh red i tee/, n., pl. heredities. Biol. 1. the transmission of genetic characters from parents to offspring: it is dependent upon the segregation and recombination of genes during meiosis and fertilization and results in the genesis of a new… …   Universalium

• Senescence — refers to the biological processes of a living organism approaching an advanced age (i.e., the combination of processes of deterioration which follow the period of development of an organism). The word senescence is derived from the Latin word… …   Wikipedia

• Conservation genetics — For molecular conservation in genetics see: conservation (genetics). For the scientific journal Conservation Genetics, see Conservation Genetics (journal). Part of a series on Genetics Key components Chromosome DNA& …   Wikipedia

• Wiley Act — Pure Food and Drug Act Le Pure Food and Drud Act, aussi appelé Wiley Act, est une importante loi fédérale américaine votée en 1906 et dont l objectif est notamment : « empècher la production, la vente et le transport de nourriture, de… …   Wikipédia en Français

• Bituminous coal — is a relatively soft coal containing a tarlike substance called bitumen. It is of higher quality than lignite coal but poorer quality than anthracite coal. Bituminous coal is an organic sedimentary rock formed by diagenetic and submetamorphic… …   Wikipedia

• pregnancy — /preg neuhn see/, n., pl. pregnancies. the state, condition, or quality of being pregnant. [1520 30; PREGN(ANT) + ANCY] * * * Process of human gestation that takes place in the female s body as a fetus develops, from fertilization to birth (see… …   Universalium