990 resultados para Agricola, Gnaeus Julius, 40-93.


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Ink on linen; location, type, amounts of plantings; signed; 49 x 17 cm.; Scale: 1" = 40' [from photographic copy by Lance Burgharrdt]

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Ink on linen; location, types of plantings; tennis court, bridges, gardens; signed; 92 x 71 cm.; Scale: 1" = 40' [from photographic copy by Lance Burgharrdt]

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von Oscar Peschel

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Simple stirring of a mixture of the alkynyl(phenyl)iodonium salts 1 with 2-aminopyrimidine 2 in chloroform under reflux for two hours in the presence of K2CO3 gave, after workup, the 2-substituted imidazo[1,2-]pyrimidines 3 in moderate to good yields. A possible mechanism for the formation of 3 involves the intramolecular cyclization of the intermediate alkylidenecarbene 6.

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C2-C8 hydrocarbon concentrations (about 35 compounds identified, including saturated, aromatic, and olefinic compounds) from 27 shipboard-sealed, deep-frozen core samples of DSDP Hole 603B off the east coast of North America were determined by a gas-stripping/thermovaporization method. Total yields representing the hydrocarbons dissolved in the pore water and adsorbed on the mineral surfaces of the sediments vary from 22 to 2400 ng/g of dryweight sediment. Highest yields are measured in the two black shale samples of Core 603B-34 (hydrogen index of 360 and 320 mg/g Corg, respectively). In organic-carbon-normalized units these samples have hydrocarbon contents of 12,700 and 21,500 ng/g Corg, respectively, indicating the immaturity of their kerogens. Unusually high organic-carbonnormalized yields are associated with samples that are extremely lean in organic carbon. It is most likely that they are enriched by small amounts of migrated light hydrocarbons. This applies even to those samples with high organic-carbon contents (1.3-2.2%) of Sections 603B-28-4, 603B-29-1, 603B-49-2, and 603B-49-3, because they have an extremely low hydrocarbon potential (hydrogen index between 40 and 60 mg/g Corg). Nearly all samples were found to be contaminated by varying amounts of acetone that is used routinely in large quantities on board ship during core-cutting procedures. Therefore, 48 samples from the original set of 75 collected had to be excluded from the present study.

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Combined media on photographic paper. 40" x 30"

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Combined media on photographic paper. 40" x 30" Private Collection

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Combined media on photographic paper. 40" x 30" Private Collection

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Combined media on photographic paper. 40" x 30" Private Collection

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Combined media on photographic paper. 40" x 30" Private Collection

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Combined media on photographic paper. 40" x 30" (shaped) Private Collection

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Combined media on photographic paper. 30" x 40" (shaped) Private Collection