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52. Multiproxy reconstruction of oceanographic conditions in the southern epeiric Kupferschiefer Sea (Late Permian) based on redox-sensitive trace elements, molybdenum isotopes and biomarkers

Author

Ruebsam, W., Dickson, A., Hoyer, E., Schwark, Lorenz, Ruebsam, W., Dickson, A., Hoyer, E., and Schwark, Lorenz

Abstract

The key drivers controlling the redox state of seawater and sediment pore waters in low energy environments can be inferred from redox-sensitive trace elements (RSTE), molecular biomarkers and trace metal isotopes. Here, we apply a combination of these tools to the Upper Permian Kupferschiefer (T1) from the Thuringian Basin, deposited in the southern part of the semi-enclosed Kupferschiefer Sea. Enrichment patterns of the RSTEs molybdenum (Mo) and uranium (U) as well as biomarker data attest to the rapid development of euxinic conditions in basin settings during early T1 times, which became progressively less extreme during T1 deposition. The evolution of redox conditions in basinal settings, and the associated delay in the onset of euxinia at more shallow marginal sites, can be attributed to the interaction of sea-level change with basin paleogeography. Euxinia in the southern Kupferschiefer Sea did not lead to near-quantitative depletion of aqueous Mo, possibly due to short deepwater renewal times in the Thuringian Basin, low aqueous H2S concentrations, the continuous resupply of RSTE during transgression and declining burial rates of RSTEs throughout T1 times. Drawdown of RSTE is, however, indicated for euxinic lagoon environments. Moreover, admixture of freshwater supplied to these lagoons by rivers strongly impacted local seawater chemistry. The highest Mo-isotope compositions of ~ 1.70‰ in basin sediments allow a minimum Kupferschiefer Sea seawater composition of ~ 2.40‰ to be estimated. This composition is similar to the ~ 2.30‰ estimate for the Late Permian open ocean, and confirms a strong hydrographic connection between the epeiric Kupferschiefer Sea and the global ocean. The substantial variation in Mo-isotope signatures is paralleled by diagnostic shifts in biomarkers responding to oxygenation in different parts of the water column. Water column chemistry has been affected by variation in sea level, hydrodynamic restriction, riverine freshwater influx an

Published
2017

61. The hydrogen breath test in resistant starch research

Author

Olesen, M., Rumessen, J.J., and Gudmand-Hoyer, E.

Subjects
Starch -- Physiological aspects, Breath tests -- Evaluation
Abstract

The use of the hydrogen breath test was evaluated in resistant starch (RS) research using five healthy volunteers who were given four different samples of RS. It was shown that the results of the hydrogen breath test is dependent on the source of RS which is reflective of certain types of RS in vivo which are not susceptible to fermentation by colonic flora. This finding also suggests that some RS types may have different ways of being fermented and as such do not produce hydrogen which is detected in the test.

Published
1992

62. Acetate in venous blood for determination of carbohydrate malabsorption

Author

Rumessen, J.J., Franck, Y.S., and Gudmand-Hoyer, E.

Subjects
Acetates -- Measurement, Carbohydrates -- Physiological aspects, blood -- analysis and chemistry
Abstract

The fermentation processes of anaerobic colonic flora produce acetate which can be detected in the peripheral blood. One of the main substrates for acetate formation are carbohydrates and as such malabsorbed carbohydrates can be measured by analyzing for acetate in the blood. A study done on the potential of measuring venous acetate as an index of carbohydrate malabsorption showed that peak rises and acetate versus time curves of enzymatically determined venous acetate may be a sensitive determinant of carbohydrate malabsorption.

Published
1992

64. ALS Elliptical wiggler

Author

Hoyer, E, Akre, J, Humphries, D, Marks, S, Minamihara, Y, Pipersky, P, Plate, D W, and Schlüter, R

Subjects
Accelerators and Storage Rings
Published
1994

65. Undulators at the ALS

Author

Hoyer, E, Akre, J, Chin, J, Gath, B, Hassenzahl, W V, Humphries, D, Kincaid, B M, Marks, S, Pipersky, P, Plate, D W, Portman, G, and Schlüter, R

Subjects
Accelerators and Storage Rings
Published
1994

74. ChemInform Abstract: Coordination Chemistry of 1,3-Dithiole-2-selone-4,5-diselenolate ( dsise) and 1,3-Dithiole-2-selone-4,5-dithiolate (dmise). Crystal and Molecular Structure of Tetrabutylammonium Bis(1,3-dithiole-2-selone-4, 5-diselenolato)nickelate(II

Author

OLK, R.-M., primary, OLK, B., additional, ROHLOFF, J., additional, REINHOLD, J., additional, SIELER, J., additional, TRUEBENBACH, K., additional, KIRMSE, R., additional, and HOYER, E., additional

Published
2010
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80. A magnetic monopole detector utilizing superconducting elements

Author

Alvarez, L. W, Antuna, M., Jr, Byrns, R. A, Eberhard, P. H, Gilmer, R. E, Hoyer, E. H, Ross, R. R, Stellrecht, H. H, and Taylor, J. D

Subjects
Instrumentation And Photography
Abstract

Electromagnetic device with superconducting elements for magnetic monopole detection in Apollo lunar samples, describing operation principle, amplifier, sample container and transport system

Published
1971

84. Feasibility Study for an Asymmetric B Factory Based on PEP

Author

Chattapadhyay, A., primary, Hitlin, D., additional, Porter, F., additional, Chin, Y.H., additional, Dell'Orco, D., additional, Forest, E., additional, Furman, M., additional, Garren, A.A., additional, Hoyer, E., additional, Kennedy, K., additional, Lambertson, G., additional, Lo, C.C., additional, Nishimura, H., additional, Oddone, P., additional, Ronan, M., additional, Sessler, A., additional, Taylor, B., additional, Taylor, C., additional, Zisman, M., additional, Barletta, W., additional, Allen, M., additional, Bloom, E., additional, Burke, D., additional, Cornacchia, M., additional, Davies-White, D., additional, Destaebler, H., additional, Donald, M.H., additional, Dorfan, J., additional, Feldman, G., additional, Rees, J., additional, Schsarz, H., additional, Sullivan, M., additional, Autin, B., additional, Tennyson, J., additional, Barbson, B., additional, and Oide, K., additional

Published
1989
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92. Labilisierung einer Carboxylgruppe der koordinierten Triethylentetramin- N, N, N′,N″, N‴, N‴ -hexaessigsäure (H6ttha): Koordinationszahlen 10 für [La(H ttha)]2- und 9 für [Dy(Httha)]2- in ihren Guanidiniumsalzen / Labilizing of a Carboxyl Group o f the Coordinated Triethylenetetramine-N, N, N′ ,N″, N‴, N‴ - hexaacetic Acid (H6ttha): Coordination Numbers 10 for [La(Httha)]2- and 9 for [Dy(Httha)]2- in their Guanidinium Salts

Author

Ruloff, R., primary, Prokop, Petra, additional, Sieler, J., additional, Hoyer, E., additional, and Beyer, L., additional

Published
1996
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96. Advanced Light Source elliptical wiggler

Author

Hoyer, E., primary, Akre, J., additional, Humphries, D., additional, Marks, S., additional, Minamihara, Y., additional, Pipersky, P., additional, Plate, D., additional, and Schlueter, R., additional

Published
1995
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98. Undulators at the Advanced Light Source

Author

Hoyer, E., primary, Akre, J., additional, Chin, J., additional, Gath, W., additional, Hassenzahl, W. V., additional, Humphries, D., additional, Kincaid, B., additional, Marks, S., additional, Pipersky, P., additional, Plate, D., additional, Portmann, G., additional, and Schlueter, R., additional

Published
1995
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