Marggraf, Andreas Sigismund

(ändrā`äs zē`gĭsmo͝ont märk`gräf'), 1709–82, German chemist, a pioneer in analytical chemistry. He proved that alumina, magnesia, and lime are distinct earths, found (1743) an improved method for the commercial preparation of phosphorus, and isolated (1746) zinc. In 1747 he announced his discovery of sugar in the beet. Marggraf directed, from 1754, the chemical laboratory of the Berlin Academy of Sciences.

Marggraf, Andreas Sigismund

Born Mar. 3, 1709, in Berlin; died there Aug. 7, 1782. German chemist. Member of the Berlin Academy of Sciences (1738) and honorary member of the St. Petersburg Academy of Sciences (1776). Marggraf perfected a means of obtaining phosphorus in 1743. In 1747, with the aid of a microscope, he discovered the presence of sugar crystals in thin sections of beet.

REFERENCE

Figurovskii, N. A. Ocherk obshchei istorii khimii. Moscow, 1969. Pages 277-80.

单词	marggraf, andreas sigismund
释义	Marggraf, Andreas Sigismund Marggraf, Andreas Sigismund (ändrā`äs zē`gĭsmo͝ont märk`gräf'), 1709–82, German chemist, a pioneer in analytical chemistry. He proved that alumina, magnesia, and lime are distinct earths, found (1743) an improved method for the commercial preparation of phosphorus, and isolated (1746) zinc. In 1747 he announced his discovery of sugar in the beet. Marggraf directed, from 1754, the chemical laboratory of the Berlin Academy of Sciences. Marggraf, Andreas Sigismund Born Mar. 3, 1709, in Berlin; died there Aug. 7, 1782. German chemist. Member of the Berlin Academy of Sciences (1738) and honorary member of the St. Petersburg Academy of Sciences (1776). Marggraf perfected a means of obtaining phosphorus in 1743. In 1747, with the aid of a microscope, he discovered the presence of sugar crystals in thin sections of beet. REFERENCE Figurovskii, N. A. Ocherk obshchei istorii khimii. Moscow, 1969. Pages 277-80.
随便看	big timbers dirt riders big time big-time bigtime basic english for communication basic english foundation basic english language basic english language skills project basic english skills test basic enlisted service date basic enlisted submarine school basic enterprise architecture methodology basic entry pay date basic environmental compliance and monitoring program basic environmental health program basic environmental policy act basic equipment list basic equipment skills assessment basicerite basicervical fracture basic esotropia basic essential obstetric care basic event basic exchange radio basic exchange radio telecommunications service