Gross, Otto

The probable existence of protactinium was predicted as early as 1871 by Mendeleev to fill up the space on his peiiodic table between thorium (at, no. 90) and uranium (at. no, 92). He termed the unconfirmed element ekatantalum. In 1926, O. Hahn predicted the properties of the element in considerable detail, including descriptions of its compounds. In 1930, Aristid v. Grosse isolated 2 milligrams of what then was termed ekatantalum pentoxide and showed that element 91 differed m all reactions with comparable amounts of tantalum compounds with exception of precipitation by NH3. However, credit for the discovery of protactinium generally is attributed to Lise Meitner and Otto Hahn in 1917,... 

Although no information was located regarding reproductive performance of Otto Euel II or its individual components, limited data are available regarding effects of propylene glycol dinitrate on the gross and microscopic structure of reproductive organs and/or revealed no treatment-related effects. 

Lee, S.L., and Otto, F.W. (1975) Gross Vortex Activities in a Simple Simulated Urban Fire, 15th International Symposium on Combustion, 25-31 August 1974, Plant Engineering, 157-161. 

Balazs GL, Grosse CU, Koch R, Reinhardt HW (1993) Acoustic emission monitoring on steel-concrete interaction. Otto Graf Journal 4 56-90... 

The seven remaining gaps in the periodic table were gradually filled, although not without further controversy in spite of the conclusive nature of Moseley s atomic number method. The first of these was element 91, discovered by Otto Hahn and Lise Meitner in 1917. The element behaved in the manner described by Mendeleev, who had given it the provisional name eka-tantalum. It now became known as protactinium but was not isolated until the year 1934 by Aristide Grosse in Germany. 

Because of poor information on the earliest osteichthyans (Gross 1968 1969 Janvier 1978 Otto 1993) and the difficulty of making homologous comparisons... 

Only two new simple quinohzidines appear to have been reported in the period under review. From the leaves of Heimia salicifolia (H.B K.) Link Otto was isolated (2S,4S,9aR)-4-(3-hydroxy-4-methoxyphenyl)quinolizi-din-2-yl acetate (1345) ([ot] 4-10.7, c 0.15, MeOH). The new alkaloid is the acetate of a kno-wn Heimia alkaloid, the alcohol 1346. In addition to full spectroscopic characterization, both the gross structure and the absolute... 

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