composizione elementare

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• Pietro Biginelli — (July 25th 1860 –January 15th 1937) was an Italian chemist, who have discovered a three component reaction between urea, acetoacetic ester and aldehydes (Biginelli reaction). He also was studying various aspects of sanitation chemistry and… …   Wikipedia

• madrigale — {{hw}}{{madrigale}}{{/hw}}s. m. 1 Breve componimento poetico, spec. di contenuto amoroso, di vario schema metrico. 2 Composizione polifonica profana fiorita soprattutto nei secoli XVI e XVII: i madrigali di Monteverdi. ETIMOLOGIA: dal lat. tardo… …   Enciclopedia di italiano