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  • 1
    Electronic Resource
    Electronic Resource
    Exploring the Conformational Behavior of Rigid Porphyrin-Quinone Systems by High-Temperature MD Simulations and Temperature-Dependent 1H-NMR Experiments (1996)
    Springer
    Journal of molecular modeling 2 (1996), S. 383-385 
    Details
    ISSN: 0948-5023
    Keywords: High-Temperature MD Simulations ; Confor-mational Analysis ; Porphyrin-Quinone Systems ; Photosynthesis Models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Photoinduced electron transfer reactions play an important role in the primary step of the biological photosynthesis process. In an attempt to understand better the mechanism of the charge separation organic donor-acceptor molecules containing porphyrins and quinones were designed as photosynthesis models. In order to study the structure dependence of the photoinduced electron transfer twofold and fourfold bridged porphyrin-quinone systems with increasing donor-acceptor distance were synthesized (Figure 1) [1, 2, 3]. It was assumed that in these molecules the porphyrin and quinone should be linked in a rigid and well-defined orientation. To verify this assumption the conformational behavior of these systems was studied by high-temperature MD simulations in combination with conformational analysis of selected minimized structures [4, 5].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0089460020383
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of the Conformational Behavior of Sialyllactose Complexed with the two Viral Attachment Proteins Influenza A Hemagglutinin and the Murine Polyomavirus (1997)
    Springer
    Journal of molecular modeling 3 (1997), S. 408-414 
    Details
    ISSN: 0948-5023
    Keywords: Keywords: Protein-Carbohydrate interactions ; MD simulations ; Flexibility ; Sialyllactose ; Influenza A virus hemagglutinin ; Murine polyoma virus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The attachment of a virus to the host cell surface is influenced by enthalpic and entropic factors. A detailed evaluation of all possible energetic interactions including the effects of solvent molecules seems to be a promising way to gain deeper insights in the overall process of binding. Here we performed intensive molecular dynamics studies to compare the conformational space available for the unbound sialyllactose in aqueous solution and when complexed with influenza A hemagglutinin and the murine polyoma virus. In general the conformational freedom of sialyllactose is considerably reduced compared to the free state. Remarkably, two different conformations of the Siaα(2-3)Galβ glycosidic linkages are preferred (which are both populated in the free state) when complexed with either protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s008940050058
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Non-neuronal cells in the spinal cord of nude and heterozygous mice. I. Ventral horn neuroglia (1981)
    Springer
    Journal of neurocytology 10 (1981), S. 805-818 
    Details
    ISSN: 1573-7381
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A quantitative light microscopic analysis of the ventral grey matter in the lumbar spinal cord of homozygous nude (nu/nu) and heterozygous (nu/+) mice was performed to determine the possible contribution of lymphocytes to normal C.N.S. tissue. If lymphocytes were present in the neuropil, they could be mistaken for neuroglial cells. Athymic nude mice offer a good model, since they lack T-lymphocytes and symptoms of neurological involvement. Mean cell counts from 1 μm sections were tested by analysis of variance. There were no strain differences for the area and number of neurons. The total neuroglial cell count was also similar, but the number of oligodendrocytes decreased 28%, astrocytes increased 51% and microglia were unchanged in the nude compared with the heterozygous mouse. There were no qualitative differences at the ultrastructural level among the neuroglia of either strain. Either the genetic defect retards and alters neuroglial cell development, or some of the small, round dark nuclei belong to lymphocytes, which have earlier migrated into the C.N.S. parenchyma. Lymphocytes could then participate in a cell-mediated immune response with brain macrophages, which are thought to be primarily derived from mononuclear leukocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01262654
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  • 4
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    Late Quaternary sediment dating and quantification of lateral sediment redistribution applying 230Thex: A study from the eastern Atlantic sector of the Southern Ocean (1996)
    Springer
    In:  Geologische Rundschau, 85 . pp. 554-566.
    Details
    Publication Date: 2020-07-30
    Description: High-resolution records of the natural radionuclide230Th were measured in sediments from the eastern Atlantic sector of the Antarctic circumpolar current to obtain a detailed reconstruction of the sedimentation history of this key area for global climate change during the late Quaternary. High-resolution dating rests on the assumption that the230Thex flux to the sediments is constant. Short periods of drastically increased sediment accumulation rates (up to a factor of 8) were determined in the sediments of the Antarctic zone during the climate optima at the beginning of the Holocene and the isotope stage 5e. By comparing expected and measured accumulation rate of230Thex, lateral sediment redistribution was quantified and vertical particle rain rates originating from the surface water above were calculated. We show that lateral contributions locally were up to 6.5 times higher than the vertical particle rain rates. At other locations only 15% of the expected vertical particle rain rate were deposited.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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