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339 results on '"Ochs R"'

1. Driving current through single organic molecules

Author

Reichert, J., Ochs, R., Beckmann, D., Weber, H. B., Mayor, M., and Loehneysen, H. v.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We investigate electronic transport through two types of conjugated molecules. Mechanically controlled break-junctions are used to couple thiol endgroups of single molecules to two gold electrodes. Current-voltage characteristics (IVs) of the metal-molecule-metal system are observed. These IVs reproduce the spatial symmetry of the molecules with respect to the direction of current flow. We hereby unambigously detect an intrinsic property of the molecule, and are able to distinguish the influence of both the molecule and the contact to the metal electrodes on the transport properties of the compound system., Comment: 4 pages, 5 figures

Published
2001
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11. Changes of Energy Metabolism and Regional Cerebral Blood Flow Studied by Positron Emission Tomography in the Interictal Phase of Partial Epilepsy

Author

Yamamoto, Y. L., Ochs, R., Ammann, W., Meyer, E., Evans, A. C., Cooke, B., Izawa, M., Kato, A., Gloor, P., Feindel, W. H., Diksic, M., Thompson, C. J., Gybels, Jan, editor, Hitchcock, Edward R., editor, Ostertag, Christoph, editor, Rossi, Gian Franco, editor, Siegfried, Jean, editor, and Szikla, Gabor, editor

Published
1984
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17. Nuclear changes in necrotic HL-60 cells

Author

BORTUL R, BILLI A. M, TABELLINI G, OCHS R. L, COCCO L, MARTELLI A. M., ZWEYER, MARINA, BAREGGI, RENATO, Bortul, R, Zweyer, Marina, BILLI A., M, Tabellini, G, OCHS R., L, Bareggi, Renato, Cocco, L, and Martelli, A. M.

Published
2001

35. The extreme nearfield of an acoustic diffraction grating

Author

Ochs, R. L., Jr, Maynard, J. D, Williams, E. G, and Hughes, W. J

Subjects
Acoustics
Abstract

An expression for the transmitted sound field near (within a fraction of a wavelength) an array of slits is derived under the assumption that the normal component of the particle velocity is the same, in the slits, as if no grating were present and zero everywhere else in the plane of the grating. The expression is in the form of an inverse Fourier transform and can be evaluated quickly using a standard fast-Fourier-transform (FFT) algorithm. Using this technique, the sound pressure on the axis of symmetry normal to the grating was evaluated for a plane-wave incident at various angles with respect to the normal to the grating, and the results were found to provide an excellent qualitative (and to a significant degree quantitative) description of some experimental measurements. Extensions of the method to oscillating pistons of arbitrary (but planar) configuration in a rigid baffle are indicated.

Published
1983
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37. Nucleolar antigens and autoantibodies in hepatocellular carcinoma and other malignancies

Author

Imai, H., Ochs, R. L., Kiyosawa, K., Furuta, S., Nakamura, R. M., and Tan, E. M.

Subjects
Male, Carcinoma, Hepatocellular, Antibodies, Neoplasm, Antigens, Neoplasm, Blotting, Western, Liver Neoplasms, Fluorescent Antibody Technique, Humans, Female, Middle Aged, Cell Nucleolus, Research Article, Autoantibodies
Abstract

Patients with hepatocellular carcinoma (HCC), gastrointestinal, lung, and ovarian cancers were shown to have autoantibodies to nuclear and nucleolar antigens as detected by immunofluorescence on cell substrates. The frequency of antinuclear antibodies (ANAs) was significantly higher (P less than 0.001) in patients with HCC (57/184 = 31%) than in patients with chronic hepatitis or liver cirrhosis (25/187 = 13%). Although a range of fluorescence patterns was observed, a higher percentage of nucleolar fluorescence was detected in HCC, and three of these nucleolar antigens were identified. They were NOR-90, nucleolus organizer region doublet polypeptides of 93 and 89 kDa involved in RNA polymerase I transcription; fibrillarin, a 34 kDa protein of the nucleolar U3 ribonucleoprotein particle which is engaged in preribosomal RNA processing; and nucleophosmin/protein B23, a 37 kDa polypeptide which is associated with ribosome maturation and cellular proliferation. All these antigens are nucleolar components that are engaged in some aspect of ribosome biosynthesis. Since autoantibodies to these nucleolar antigens have also been found in systemic autoimmune diseases, they do not represent autoimmune reactions unique to cancer but might reflect reaction pathways related to immune responses that are antigen-driven. The ANA response in HCC appears to be dynamic reactions to this antigen-drive since some patients with chronic liver disease showed seroconversion to ANA positivity, marked increase in titer and/or change in antibody specificity preceding or coincident with clinical detection of HCC. These changes in ANA showed a close temporal relationship with transformation from long-established chronic liver disease to HCC.

Published
1992

38. Risks of in-vitro production of cattle and swine embryos:aberrations in chromosome numbers, ribosomal RNA gene activation and perinatal physiology

Author

Hyttel, P., Viuff, D., Laurincik, J., Schmidt, M., Dybdahl Thomsen, P., Avery, B., Callesen, H., Rath, D., Niemann, H., Rosenkrantz, C., Schellander, K., Ochs, R. L., Greve, T., Hyttel, P., Viuff, D., Laurincik, J., Schmidt, M., Dybdahl Thomsen, P., Avery, B., Callesen, H., Rath, D., Niemann, H., Rosenkrantz, C., Schellander, K., Ochs, R. L., and Greve, T.

Published
2000

39. Activation of ribosomal RNA genes in preimplantation cattle and swine embryos

Author

Hyttel, P., Laurincik, J., Viuff, D., Fair, T., Zakhartchenko, V., Rosenkranz, C., Avery, B., Rath, D., Niemann, H., Dybdahl Thomsen, P., Shellander, K., Callesen, H., Wolf, E., Ochs, R. L., Greve, T., Hyttel, P., Laurincik, J., Viuff, D., Fair, T., Zakhartchenko, V., Rosenkranz, C., Avery, B., Rath, D., Niemann, H., Dybdahl Thomsen, P., Shellander, K., Callesen, H., Wolf, E., Ochs, R. L., and Greve, T.

Published
2000

46. Nucleolus formation in bovine and porcine embryos

Author

Hyttel, P., Laurincik, J, Rosenkrantz, C., Ochs, R. L., Avery, B., Niemann, H, Greve, T., Rath, D., Hyttel, P., Laurincik, J, Rosenkrantz, C., Ochs, R. L., Avery, B., Niemann, H, Greve, T., and Rath, D.

Published
1999

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