LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 71

Search options

  1. Book ; Thesis: Untersuchung Motorischer Veränderungen bei Patienten mit Normaldruckhydrozephalus im Rahmen des Spinal Tap-Test

    Aumann, Tina

    2016  

    Author's details vorgelegt von Tina Aumann
    Language German
    Size 75 Seiten, Illustrationen, Diagramme, 21 cm
    Publishing place Marburg
    Publishing country Germany
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Dissertation, Universität Marburg, 2016
    HBZ-ID HT019433249
    Database Catalogue ZB MED Medicine, Health

    More links

    Kategorien

    In stock of ZB MED Cologne/Königswinter

    Shelf markLoan statusLocation
    2017 D 946 order for loan Magazin

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  2. Article ; Online: Peeling Off Neutron Skins from Neutron-Rich Nuclei: Constraints on the Symmetry Energy from Neutron-Removal Cross Sections.

    Aumann, T / Bertulani, C A / Schindler, F / Typel, S

    Physical review letters

    2017  Volume 119, Issue 26, Page(s) 262501

    Abstract: An experimentally constrained equation of state of neutron-rich matter is fundamental for the physics of nuclei and the astrophysics of neutron stars, mergers, core-collapse supernova explosions, and the synthesis of heavy elements. To this end, we ... ...

    Abstract An experimentally constrained equation of state of neutron-rich matter is fundamental for the physics of nuclei and the astrophysics of neutron stars, mergers, core-collapse supernova explosions, and the synthesis of heavy elements. To this end, we investigate the potential of constraining the density dependence of the symmetry energy close to saturation density through measurements of neutron-removal cross sections in high-energy nuclear collisions of 0.4 to 1 GeV/nucleon. We show that the sensitivity of the total neutron-removal cross section is high enough so that the required accuracy can be reached experimentally with the recent developments of new detection techniques. We quantify two crucial points to minimize the model dependence of the approach and to reach the required accuracy: the contribution to the cross section from inelastic scattering has to be measured separately in order to allow a direct comparison of experimental cross sections to theoretical cross sections based on density functional theory and eikonal theory. The accuracy of the reaction model should be investigated and quantified by the energy and target dependence of various nucleon-removal cross sections. Our calculations explore the dependence of neutron-removal cross sections on the neutron skin of medium-heavy neutron-rich nuclei, and we demonstrate that the slope parameter L of the symmetry energy could be constrained down to ±10  MeV by such a measurement, with a 2% accuracy of the measured and calculated cross sections.
    Language English
    Publishing date 2017-12-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.119.262501
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    In stock of ZB MED Bonn / Germany

    Z 4' 58/153: Show issues

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  3. Article ; Online: Observation of the competitive double-gamma nuclear decay.

    Walz, C / Scheit, H / Pietralla, N / Aumann, T / Lefol, R / Ponomarev, V Yu

    Nature

    2015  Volume 526, Issue 7573, Page(s) 406–409

    Abstract: The double-gamma (γγ)-decay of a quantum system in an excited state is a fundamental second-order process of quantum electrodynamics. In contrast to the well-known single-gamma (γ)-decay, the γγ-decay is characterized by the simultaneous emission of two ... ...

    Abstract The double-gamma (γγ)-decay of a quantum system in an excited state is a fundamental second-order process of quantum electrodynamics. In contrast to the well-known single-gamma (γ)-decay, the γγ-decay is characterized by the simultaneous emission of two γ quanta, each with a continuous energy spectrum. In nuclear physics, this exotic decay mode has only been observed for transitions between states with spin-parity quantum numbers J(π) = 0(+) (refs 1-3). Single-gamma decays-the main experimental obstacle to observing the γγ-decay-are strictly forbidden for these 0(+) → 0(+) transitions. Here we report the observation of the γγ-decay of an excited nuclear state (J(π) = 11/2(-)) that is directly competing with an allowed γ-decay (to ground state J(π) = 3/2(+)). The branching ratio of the competitive γγ-decay of the 11/2(-) isomer of (137)Ba to the ground state relative to its single γ-decay was determined to be (2.05 ± 0.37) × 10(-6). From the measured angular correlation and the shape of the energy spectra of the individual γ-rays, the contributing combinations of multipolarities of the γ radiation were determined. Transition matrix elements calculated using the quasiparticle-phonon model reproduce our measurements well. The γγ-decay rate gives access to so far unexplored important nuclear structure information, such as the generalized (off-diagonal) nuclear electric polarizabilities and magnetic susceptibilities.
    Language English
    Publishing date 2015-10-15
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/nature15543
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    In stock of ZB MED Cologne/Königswinter

    Zs.A 26: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)
    Zs.MG 9: Show issues
    Zs.MO 244: Show issues

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  4. Article ; Online: Activity-dependent regulation of the dopamine phenotype in substantia nigra neurons.

    Aumann, Tim / Horne, Mal

    Journal of neurochemistry

    2012  Volume 121, Issue 4, Page(s) 497–515

    Abstract: Degeneration of dopamine (DA) neurons in the substantia nigra pars compacta (SNc) causes the motor symptoms of Parkinson's disease. The development of cell-replacement therapies for Parkinson's disease motor symptoms is hampered by poor acquisition and ... ...

    Abstract Degeneration of dopamine (DA) neurons in the substantia nigra pars compacta (SNc) causes the motor symptoms of Parkinson's disease. The development of cell-replacement therapies for Parkinson's disease motor symptoms is hampered by poor acquisition and retention of the DA phenotype by endogenous and transplanted neurons. Factors which regulate the DA phenotype in the adult SNc are, therefore, keenly sought. Transcription of the rate-limiting enzyme in DA synthesis, tyrosine hydroxylase, and possibly other DA genes, is known to be regulated by changes in membrane potential and intracellular Ca²⁺. Furthermore, emerging evidence indicates DA gene transcription is sensitive to fast membrane potential changes and intracellular Ca²⁺ transients, that is, those associated with normal rates and patterns of neuronal activity. In other words, the DA phenotype is activity-dependent. In this review, we highlight the importance of spatiotemporal Ca²⁺ dynamics for regulating gene expression in cells, and the possible role of fast Ca²⁺ dynamics associated with normal rates and patterns of neuronal activity. We review evidence supporting activity- and Ca²⁺-dependent regulation of the DA phenotype in cells, including SNc neurons, as well as knowledge about the molecular pathways intervening between intracellular Ca²⁺ and TH gene expression. We describe the electrophysiology of SNc DA neurons, emphasizing features that may regulate DA gene expression. We conclude by bringing together this information in a model of how neuronal activity might regulate the DA phenotype in SNc neurons.
    MeSH term(s) Animals ; Brain Chemistry/genetics ; Brain Chemistry/physiology ; Calcium Signaling/physiology ; Dopamine/genetics ; Dopamine/physiology ; Dopaminergic Neurons/physiology ; Gene Expression Regulation/physiology ; Humans ; Models, Neurological ; Phenotype ; Substantia Nigra/cytology ; Substantia Nigra/physiology ; Tyrosine 3-Monooxygenase/genetics ; Tyrosine 3-Monooxygenase/metabolism
    Chemical Substances Tyrosine 3-Monooxygenase (EC 1.14.16.2) ; Dopamine (VTD58H1Z2X)
    Language English
    Publishing date 2012-05
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 80158-6
    ISSN 1471-4159 ; 0022-3042 ; 1474-1644
    ISSN (online) 1471-4159
    ISSN 0022-3042 ; 1474-1644
    DOI 10.1111/j.1471-4159.2012.07703.x
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    In stock of ZB MED Cologne/Königswinter

    Ui II Zs.170: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  5. Article: Cerebello-thalamic synapses and motor adaptation.

    Aumann, T D

    Cerebellum (London, England)

    2003  Volume 1, Issue 1, Page(s) 69–77

    Abstract: The cerebellum's influence on voluntary movement is mediated, in large part, through the cerebello-thalamo-cortical (CTC) pathway. Of particular relevance here are those neurons in the cerebellar nuclei that project, via thalamus, to pyramidal tract ... ...

    Abstract The cerebellum's influence on voluntary movement is mediated, in large part, through the cerebello-thalamo-cortical (CTC) pathway. Of particular relevance here are those neurons in the cerebellar nuclei that project, via thalamus, to pyramidal tract neurons in primary motor cortex. Several lines of evidence implicate cerebello-thalamic (CT) synaptic plasticity as a neural substrate underlying movement adaptation in adult animals. CT synapses exhibit a number of structural characteristics suggestive of a capacity for both formation of new synapses, and alterations in efficacy of transmission across existing synapses. Long-term potentiation can be evoked across CT synapses in vitro by high frequency stimulation, albeit in young animals. Evidence regarding the contribution of CT synaptic plasticity to two different types of movement adaptation in adult animals is conflicting. Adaptation involving a strengthening and re-coordination of voluntary movement is associated with an increase in density of CT synaptic boutons and an increase in number of synaptic vesicles available for immediate neurotransmitter release within each bouton. On the other hand, adaptation involving associative conditioning of a reduced sensorimotor neural circuit is associated with plasticity at thalamo-cortical but not CT synapses. These conflicting findings may reflect differences in the extent of synaptic re-organization that occurs at thalamic versus cortical levels, differences in the neural circuitry mediating each behavior, and/or differences in the spatio-temporal convergence of activity in the thalamus during the adaptive processes. It is concluded that CT synaptic plasticity can underlie movement adaptation if the adaptation requires reorganization of the cerebellum's influence on cerebral cortex.
    MeSH term(s) Adaptation, Physiological/physiology ; Animals ; Cerebellar Nuclei/physiology ; Cerebellar Nuclei/ultrastructure ; Humans ; Motor Cortex/physiology ; Motor Cortex/ultrastructure ; Movement/physiology ; Neural Pathways/physiology ; Neural Pathways/ultrastructure ; Neuronal Plasticity/physiology ; Presynaptic Terminals/physiology ; Presynaptic Terminals/ultrastructure ; Synaptic Transmission/physiology ; Ventral Thalamic Nuclei/physiology ; Ventral Thalamic Nuclei/ultrastructure
    Language English
    Publishing date 2003-07-14
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2112586-7
    ISSN 1473-4222
    ISSN 1473-4222
    DOI 10.1080/147342202753203104
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    In stock of ZB MED Cologne/Königswinter

    Zs.A 5795: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  6. Book: Reactions with fast radioactive beams of neutron-rich nuclei

    Aumann, Thomas

    (GSI-Preprint ; 2005,12)

    2005  

    Author's details T. Aumann. Gesellschaft für Schwerionenforschung mbH
    Series title GSI-Preprint ; 2005,12
    Language English
    Size 38 S, graph. Darst, 30 cm
    Publisher GSI
    Publishing place Darmstadt
    Document type Book
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  7. Book: Manifestation of the halo structure in momentum distributions from 6-He fragmentation

    Aumann, T

    (GSI-Preprint ; 98-17)

    1998  

    Institution Gesellschaft für Schwerionenforschung
    Author's details Gesellschaft für Schwerionenforschung mbH. T. Aumann
    Series title GSI-Preprint ; 98-17
    Language English
    Size 15 S, graph. Darst
    Publisher GSI
    Publishing place Darmstadt
    Document type Book
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  8. Book: Giant resonances in unstable oxygen isotopes

    Aumann, T

    (GSI-Preprint ; 98-54)

    1998  

    Institution Gesellschaft für Schwerionenforschung
    Author's details Gesellschaft für Schwerionenforschung mbH, Darmstadt. T. Aumann
    Series title GSI-Preprint ; 98-54
    Language English
    Size 8 S
    Publisher Ges. für Schwerionenforschung mbH
    Publishing place Darmstadt
    Document type Book
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  9. Article ; Online: FAIR - from a few-body perspective

    Stöhlker Th. / Peters K. / Langanke K. / Aumann T.

    EPJ Web of Conferences, Vol 3, p

    2010  Volume 01006

    Abstract: In the next years the Facility for Antiproton and Ion Research FAIR will be constructed at the GSI Helmholtzzentrum fur Schwerionenforschung in Darmstadt, Germany. This new accelerator complex will allow for unprecedented and pathbreaking research in ... ...

    Abstract In the next years the Facility for Antiproton and Ion Research FAIR will be constructed at the GSI Helmholtzzentrum fur Schwerionenforschung in Darmstadt, Germany. This new accelerator complex will allow for unprecedented and pathbreaking research in hadronic, nuclear, and atomic physics as well as in applied sciences. This manuscript will discuss some of these research opportunities, with a focus on few-body physics.
    Keywords Physics ; QC1-999 ; Science ; Q ; DOAJ:Physics (General) ; DOAJ:Physics and Astronomy
    Language English
    Publishing date 2010-04-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  10. Book: Few-neutron removal from 238U at relativistic energies

    Aumann, T

    (Preprint / Gesellschaft für Schwerionenforschung mbH, GSI ; 95-19)

    1995  

    Institution Gesellschaft für Schwerionenforschung
    Author's details Gesellschaft für Schwerionenforschung mbH. T. Aumann
    Series title Preprint / Gesellschaft für Schwerionenforschung mbH, GSI ; 95-19
    Language English
    Size 18 S, graph. Darst, 30 cm
    Edition Preprint
    Publisher GSI
    Publishing place Darmstadt
    Document type Book
    Note Literaturverz. S. 16 - 18
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

To top