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  • 1
    Digitale Medien
    Digitale Medien
    Reaction of dienes with selenium dioxide. 2. Unexpected 8-oxa-3-selenabicyclo[3.2.1]octanes from linalool (1993)
    s.l. : American Chemical Society
    The @journal of organic chemistry 58 (1993), S. 7942-7944 
    Details
    ISSN: 1520-6904
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/jo00079a052
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  • 2
    Digitale Medien
    Digitale Medien
    Widespread Horizontal Connections Arising from Layer 5/6 Border Inverted Cells in Rabbit Visual Cortex (1992)
    Oxford, UK : Blackwell Publishing Ltd
    European journal of neuroscience 4 (1992), S. 0 
    Details
    ISSN: 1460-9568
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Herein we describe the inverted cells [defined as those projection neurons having a major dendritic shaft abpially oriented (Bueno-López et al., Eur. J. Neurosci., 3, 415, 1991)] originating a unique set of cortical connections characterized by extraordinarily widespread horizontal distribution. Single and multiple injections of wheatgerm agglutinin - horseradish peroxidase were made in areas 17 and 18 and the resulting retrograde labelling in the cortex was analysed. The findings were assessed in independent control experiments in which Fluoro-Gold was used as retrograde tracer. Following single injections in area 17 several separate patches of labelled cells comprising layers 2–6 were consistently found in area 18. In addition to these associational cells a number of labelled cells appeared at the layer 5/6 border but were distributed over most of the tangential extent of the visual occipital cortex. This widespread pattern was particularly striking in brains after multiple injections. In these brains a conspicuous band of labelled cells at the 5/6 border radiated from the injection sites, making up an apparently continuous horizontal sheet that intersected the striate - extrastriate boundary and merged with the patches of labelled cells in area 18 and beyond. Most of the cells in the 5/6 border band were inverted cells (82%; n= 2081). Injections in area 18 failed to produce such a widespread set of labelled cells in area 17. The functional significance of these connections furnished by the 5/6 border inverted cells remains to be determined, but their distribution would allow for convergent/divergent binding interactions both intra-areally (within area 17) and inter-areally (from area 18 to area 17).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-9568.1992.tb00870.x
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  • 3
    Digitale Medien
    Digitale Medien
    Targets and Laminar Distribution of Projection Neurons with ‘Inverted’ Morphology in Rabbit Cortex (1991)
    Oxford, UK : Blackwell Publishing Ltd
    European journal of neuroscience 3 (1991), S. 0 
    Details
    ISSN: 1460-9568
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: This study examines the axonal projections of so-called inverted pyramids and other neurons with their major dendritic shaft oriented in the direction of the white matter (‘inverted cells’) in the adult rabbit cortex. Single injections of horseradish peroxidase wheat germ agglutinin were made into cortical or subcortical sites. The resulting retrograde labelling in the cortex was analysed and the distribution across areas and layers of inverted cells contributing to each of these projections was estimated. In addition, the radial distribution of inverted cells was independently determined from rapid Golgi-impregnated and Nissl-stained material. All three procedures revealed that inverted cells lay overwhelmingly in infragranular layers, but congregated at the border between layers 5 and 6. Inverted cells, identified by retrograde labelling, seldom furnished non-telencephalic centres; in contrast, these cells constituted a major source for the projections to the ipsi- or the contralateral cortex, the claustrum or the nucleus caudatus. In general, each set of inverted cells (when defined by its specific destination as a group) was located below the typically oriented cells whose axons were aimed at the same target. Thus, the inverted cells of the rabbit cortex are characterized not only by their unique morphology and their corticocortical, corticoclaustral and corticostriatal projections, but also by their distinctive radial locations. These findings suggest that inverted cells, even though possibly composed of different cell types, are a specific class of projection neurons.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-9568.1991.tb00829.x
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  • 4
    Digitale Medien
    Digitale Medien
    Existence of Solutions of a Kinetic Equation Modeling Cometary Flows (1999)
    Springer
    Journal of statistical physics 96 (1999), S. 361-376 
    Details
    ISSN: 1572-9613
    Schlagwort(e): kinetic equation ; wave–particle collision operator ; cometary flows ; cosmic rays ; quasilinear plasma theory ; approximate solution ; dispersive lemma
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A global existence theorem is presented for a kinetic problem of the form ∂ t f+v·∇ x f=Q(f), f(t=0)=f 0, where Q(f) is a simplified model wave–particle collision operator extracted from quasilinear plasma physics. Evaluation of Q(f) requires the computation of the mean velocity of the distribution f. Therefore, the assumptions on the data are such that vacuum regions, where the mean velocity is not well defined, are excluded. Also the initial data are assumed to have bounded total energy. As additional results conservation laws for mass, momentum, and energy are derived, as well as an entropy dissipation law and the propagation of higher order moments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1004584719071
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  • 5
    Digitale Medien
    Digitale Medien
    On the macroscopic dynamics induced by a model wave-particle collision operator (1998)
    Springer
    Continuum mechanics and thermodynamics 10 (1998), S. 153-178 
    Details
    ISSN: 1432-0959
    Schlagwort(e): AMS Subject classification:41A60, 35Q20, 76P05
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: The macroscopic dynamics of a kinetic equation involving a model wave-particle collision operator of plasma physics is investigated. The Chapman-Enskog asymptotics is first considered in the framework of a hydrodynamic scaling. The obtained macroscopic model still involves a kinetic variable, the particle energy in the rest frame of the fluid, but shares similarities with the compressible Navier-Stokes equation of gas dynamics. Then a diffusive scaling is examined under the hypothesis of small perturbations of a global equilibrium. In this case, the macroscopic model couples the usual incompressible Navier-Stokes with a diffusion equation for the energy distribution function of the particles, constrained by an extended version of the Boussinesq relation. In both cases, the effect of a Lorentz force term is developed, in the perspective of plasma physical modelling.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001610050087
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  • 6
    Digitale Medien
    Digitale Medien
    Identification of Hox Gene Sequences in the Sea Cucumber Holothuria glaberrima Selenka (Holothuroidea: Echinodermata) (2000)
    Springer
    Marine biotechnology 2 (2000), S. 231-240 
    Details
    ISSN: 1436-2236
    Schlagwort(e): Key words: Deuterostomes, echinoderms, holothuroids, paralogous group, partial homeodomain, orthologues
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Abstract: The Echinodermata is a unique animal group forming an early branch in the deuterostomes phylogenetic tree. In echinoids and asteroids a single Hox cluster with nine cognates of the vertebrate Hox paralogous groups has been reported, but no data are available from other echinoderm classes. We report here nine Hox-type sequences from the sea cucumber Holothuria glaberrima, a member of the class Holothuroidea. Partial homeodomain sequences were amplified by polymerase chain reaction from genomic DNA and from a regenerating gastrointestinal tract complementary DNA library. Sequence analyses suggest that the holothuroid cluster has at least three genes of the anterior, one of the medial, and five of the posterior groups. This is the first evidence of five posterior sequences in echinoderms.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s101269900027
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  • 7
    facet.materialart.
    Unbekannt
    Pelagic and benthic communities of the Antarctic ecosystem of Potter Cove: Genomics and ecological implications (2017)
    ELSEVIER SCIENCE BV
    In:  EPIC3Marine Genomics, ELSEVIER SCIENCE BV, 33, pp. 1-11, ISSN: 1874-7787
    Details
    Publikationsdatum: 2017-06-30
    Beschreibung: Molecular technologies are more frequently applied in Antarctic ecosystem research and the growing amount of sequence-based information available in databases adds a new dimension to understanding the response of Antarctic organisms and communities to environmental change. We apply molecular techniques, including fingerprinting, and amplicon and metagenome sequencing, to understand biodiversity and phylogeography to resolve adaptive processes in an Antarctic coastal ecosystem from microbial to macrobenthic organisms and communities. Interpretation of the molecular data is not only achieved by their combination with classical methods (pigment analyses or microscopy), but furthermore by combining molecular with environmental data (e.g., sediment characteristics, biogeochemistry or oceanography) in space and over time. The studies form part of a long-term ecosystem investigation in Potter Cove on King-George Island, Antarctica, in which we follow the effects of rapid retreat of the local glacier on the cove ecosystem. We formulate and encourage new approaches to integrate molecular tools into Antarctic ecosystem research, environmental conservation actions, and polar ocean observatories.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev , info:eu-repo/semantics/article
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    ARTIKEL (OA)
  • 8
    facet.materialart.
    Unbekannt
    Age determined from the daily deposition of concentric rings on common octopus (Octopus vulgaris) beaks (2001)
    U.S. Dept. of Commerce
    In:  Fishery Bulletin, 99 (4). pp. 679-684.
    Details
    Publikationsdatum: 2021-07-02
    Materialart: Article , PeerReviewed
    Format: text
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    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
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