Johann Wolfgang Döbereiner

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Döbereiner, Johann Wolfgang

 

Born Dec. 15, 1780, in Hof; died Mar. 24, 1849, in Jena. German chemist. Professor of chemistry, technology, and pharmacology at the University of Jena from 1810.

Between 1821 and 1823, Döbereiner discovered that finely ground platinum evoked a chemical reaction (oxidation of a mixture of the vapors of ethyl alcohol and air, explosion of a mixture of hydrogen and oxygen, and other reactions); the platinum itself did not change in the process. In 1832 he demonstrated that in the presence of finely ground platinum, sulfur dioxide is oxidized by oxygen into sulfur anhydride. In 1835, J. Berzelius called all these phenomena catalysis. Döbereiner noted (in 1817 for Ca, Sr, Ba and in 1829 for Li, Na, K; S, Se, Te; and Cl, Br, I) that if three chemically similar elements are placed in the order of their atomic weights, then the atomic weight of the middle element of such a trio is approximately equal to half the sum of the atomic weights of the outer elements. These so-called Döbereiner’s triads were the first attempt to classify elements according to their atomic weight.

WORKS

“Versuch zu einer Gruppierung der elementaren Stoffe nach ihrer Analogie.” In J. W. Döbereiner and M. Pettenkofer, Die Anfänge des natürlichen Systems der chemischen Elemente. Leipzig, 1895.

REFERENCES

Mittasch, A., and E. Theiss. Ot Devi i Debereinera do Dikona: piat’desiat let ν oblasti geterogennogo kataliza. Kharkov, 1934. (Translated from English.)
Giua, M. Istoriia khimii. Moscow, 1966. (Translated from Italian.)
References in periodicals archive ?
La biofertilizacion del cacao (Theobroma cacao L) en vivero con Azospirillum brasilense Tarrand, Krieg et Dobereiner y Glomus intraradices Schenk et Smith.
Dobereiner en Alemania (1829) los organizo en triadas (algunas aun vigentes) y establecio que la masa atomica del elemento intermedio es el promedio de los otros dos.
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[30.] Tokarnia CH, Peixoto PV, Barbosa JD, Brito MF, Dobereiner J.
[32] TOKARNIA, C.H.; BRITO, M., BARBOSA, J.D.; PEIXOTO, P.V.; DOBEREINER, J.
El otro grupo de raices fue lavado solo con ADE y en cada caso, segmentos de 1 cm, fueron introducidos hasta el centro de los viales de 10 mL con 5 mL de medio semisolido libre de nitrogeno (NFb) modificado (Dobereiner y Day, 1976) e incubados a 30 [grados]C hasta formarse una pelicula blanquecina sub-superficial, caracteristica del crecimiento de Azospirillum.
The biofertiliser microbes, namely Azospirillum and PSB, were mass multiplied in nitrogen-free bromothymol blue and Pikovskaya's broth (composition as described by Dobereiner (1995) and Pikovskaya (1948)) in an incubator shaker at 30[degrees] [+ or -] 1[degrees]C and 150 r.p.m.
(27.) Tokarnia CH, Farias M, Barbosa JD, Vargas P, Dobereiner J.
Dobereiner (1966) indica que la especificidad de este genero con la rizosfera de una planta es mas intima que en otras bacterias diazotroficas, por lo tanto su abundancia esta relacionada con la especie de planta asociada (Sariv & Ragoviv, 1963).
To better understand what such a place might actually be like, David Dobereiner, Chris Brown and I created Organicity: an illustrated prototype for localised, autonomous, sustainable, urban community infrastructure.