Diagnostik arterieller Gefäßerkrankungen mittels Klassifikation peripherer und kardialer Impedanzsignale

Verschiedene Zeitbereichsparameter sowie aus der Wavelet-Transformation gewonnene Merkmale wurden hinsichtlich ihrer Eignung zur Frühdiagnostik peripherer Gefäßerkrankungen untersucht. Der Untersuchung liegen periphere und zentrale Impedanzsignale von 78 Probanden und 74 Dialysepatienten, die im Rahmen ihrer Therapie auf entsprechende Gefäßerkrankungen untersucht wurden, zugrunde. Zur diagnostischen Entscheidungsfindung wird ein Klassifikationsbaum verwendet. Die kombinierte Betrachtung zentraler und peripherer Kurven gestattet in Verbindung mit den Wavelet-Koeffizienten eine differenziertere Beurteilung des arteriellen Gefäßsystems als bisher bekannte, auf der Analyse von Kurven nur eines Messabschnittes beruhende Methoden

Plant Cell Tissue Organ Cult.

The percentage of cells successfully transformed by Agrobacteria is usually very low (not more than 10% and usually much less; Thomas et al., 1989). In this report we show that in carrot (Daucus carota L., ssp. sativus) cell suspensions transformation efficiency was strongly improved by using cell cycle synchronized cells. Fluorodesoxyuridine (FDU) was added for 24 h to inhibit thymidine synthesis. This blocked the cell cycle at the transition from G1- to S-phase. Then the block was released by applying thymidine. A high rate of transformation was obtained when Agrobacterium tumefaciens was added concurrently with thymidine. As examples of efficient and long term foreign gene expression in transgenic cells, the reporter enzyme beta-glucuronidase (GUS) as a model as well as the major hepatitis B virus surface protein were used. Both genes were linked to the MAS promoter. In carrot cell suspensions containing the viral gene, the corresponding viral protein was produced. In roots of mature transgenic carrot plants generated through somatic embryogenesis and raised in soil as well as in callus cultures derived thereof, the viral protein was also produced

Characterization plan for Hanford spent nuclear fuel

Reprocessing of spent nuclear fuel (SNF) at the Hanford Site Plutonium-Uranium Extraction Plant (PUREX) was terminated in 1972. Since that time a significant quantity of N Reactor and Single-Pass Reactor SNF has been stored in the 100 Area K-East (KE) and K-West (KW) reactor basins. Approximately 80% of all US Department of Energy (DOE)-owned SNF resides at Hanford, the largest portion of which is in the water-filled KE and KW reactor basins. The basins were not designed for long-term storage of the SNF and it has become a priority to move the SNF to a more suitable location. As part of the project plan, SNF inventories will be chemically and physically characterized to provide information that will be used to resolve safety and technical issues for development of an environmentally benign and efficient extended interim storage and final disposition strategy for this defense production-reactor SNF

Fuel performance annual report for 1990. Volume 8

This annual report, the thirteenth in a series, provides a brief description of fuel performance during 1990 in commercial nuclear power plants. Brief summaries of fuel design changes, fuel surveillance programs, fuel operating experience and trends, fuel problems high-burnup fuel experience, and items of general significance are provided . References to additional, more detailed information, and related NRC evaluations are included where appropriate