Karsten sentence example

karsten
  • In 1842 Karsten discovered that lead could be desilverized by means of zinc. His invention, however, only took practical form in1850-1852through the researches of Parkes, who showed how the zinc-silver-lead alloy formed could be worked and the desilverized lead freed from the zinc it had taken up. In the Parkes process only 5% of the original lead need be cupelled.
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  • The specific gravity of zinc cannot be expected to be perfectly constant; according to Karsten, that of pure ingot is 6.915, and rises to 7.191 after rolling.
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  • Michaelis, he was compensated for this by the esteem of Frederick the Great, of Lessing, Karsten Niebuhr, and many foreign scholars.
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  • Experiments made in Germany by Karsten, Jobst and Vulpius have shown that it is possible to obtain in that country opium of excellent quality, containing from 8 to 13% of morphia.
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  • Karsten also ascertained by experiments made at Bogota on C. lancifolia that the barks of one district were sometimes devoid of quinine, while those of the same species from a neighbouring locality yielded 32 to 42% of the sulphate; moreover, Dr De Vrij found that the bark of C. officinalis cultivated at Utakamand varied in the yield of quinine from I to 9%.
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  • In certain species of Gnetum described by Karsten the megaspore contains a peripheral layer of protoplasm, in which scattered nuclei represent the female reproductive cells; in Gnetum Gnemon a similar state of things exists in the upper half of the megaspore, while the lower half agrees with the megaspore of Welwitschia in being full of prothallus-tissue, which serves merely as a reservoir of food.
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  • Scarlett Johansson was born November 22, 1984 in Manhattan, New York, to Karsten and Melanie Johansson.
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