Albert Niemann, Ganzfigurbildnis

Signatur des Originals: S 36/F01422

Albert Niemann, Ganzfigurbildnis

Signatur des Originals: S 36/F01423

Albert Niemann als Lohengrin, Rollenbild, Brustbild, in: Richard Wagner: Lohengrin

Signatur des Originals: S 36/F05588

Albert Niemann, Brustbild

Signatur des Originals: S 36/F05589

Albert Niemann als Tristan, Rollenbild, in: Richard Wagner: Tristan und Isolde

Signatur des Originals: S 36/F09420

Albert Niemann als Tannhäuser, Rollenbild, in: Richard Wagner: Tannhäuser und der Sängerkrieg auf Wartburg

Signatur des Originals: S 36/F09421

Albert Niemann als Lohengrin, Rollenbild, in: Richard Wagner: Lohengrin

Signatur des Originals: S 36/F09422

Albert Niemann als Siegmund, Rollenbild, in: Richard Wagner: Die Walküre

Signatur des Originals: S 36/F09423

Albert Niemann, Brustbild

Signatur des Originals: S 36/F09424

Hedwig Niemann, Rollenbild, Brustbild, Profil

Signatur des Originals: S 36/F09425

C1-C5 hydrocarbons from core gas pockets at DSDP Leg 56 Holes

C1-C5 hydrocarbons from DSDP Legs 56 and 57 sediment gas pockets were analyzed on board ship. Results suggest that the C2-C5 hydrocarbons accompanied biogenic methane and were generated at low temperatures - less than 50° C - either by microorganisms or by low-temperature chemical reactions. Neopentane, a rare constituent of petroleum, is the major C5 component (about 80%) in much of the sediment at Site 438. This compound, which appeared in smaller amounts at Sites 434, 439, 440, and 441, seems to correlate with either fractured or coarse-grained sediments. Scatter in C4 and C5 isomer ratios and generally good correlation between C3, C4 and C5 components suggest local sources for these molecules.

C1-C8 hydrocarbons in DSDP Leg 64 Holes sediments

Sediments from the Baja California Continental Margin Transect - Sites 474 and 476 - showed small amounts of C2-C8 hydrocarbons and functionalized compounds (alkenes) typical of organic-rich, Recent, cold (<30°C) marine sediments. In contrast, some samples from Sites 477, 478, 479, and Hole 481A in the Guaymas Basin, an active spreading center, showed the characteristics of thermally generated hydrocarbons. These include an increase (sometimes exponential) in amount and diversity of C2-C8 hydrocarbons and a decrease in alkenes in more thermally mature sediments. The results indicate that the injection of basaltic sills has minimal effect on C2-C8 hydrocarbon generation except in the immediate vicinity of the sill. The absence of light hydrocarbons close to the hottest sills suggests that the compounds distill away as they are formed in these areas of very active hydrothermal circulation. A sample of young sediment exposed to very high temperatures (>300°C) from deeper thermal sources at the hottest site, 477, showed a very limited hydrocarbon distribution, including primarily ethane, benzene, and toluene, together with smaller amounts of propane and butane.