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  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2369-2371 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We examine effects of the exchange interaction on the thermalization dynamics of high-density photogenerated plasmas in quantum wells. A technique for simulating the transient dynamics is presented which combines the conventional Ensemble Monte Carlo method for the carrier-phonon scattering, with a molecular dynamics scheme for treating the many-body contributions to the long-range Coulomb potentials. Account is taken of the exchange-energy interactions in keeping with the exclusion principle and the Fermi nature of the system. Our results indicate that the exchange corrections slow the cooling of the photogenerated plasma at carrier densities above 1012 cm−2. The effect is due primarily to a weakening of the direct Colomb force, and demonstrates that calculations based on simple carrier–carrier scattering alone would underestimate thermalization time constants.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biology of the Cell 81 (1994), S. 89-93 
    ISSN: 0248-4900
    Keywords: actin ; calicin ; calmodulin ; cylicin ; spermatozoa ; tubulin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biology of the Cell 73 (1991), S. 15 
    ISSN: 0248-4900
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biology of the Cell 75 (1992), S. 258 
    ISSN: 0248-4900
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Solid State Electronics 31 (1988), S. 401-406 
    ISSN: 0038-1101
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Der Nervenarzt 71 (2000), S. 431-441 
    ISSN: 1433-0407
    Keywords: Schlüsselwörter Genetik ; Dystonie ; Übersicht ; Key words Genetics ; Dystonia ; Review
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary To date, at least 12 types of primary dystonia can be distinguished on a genetic basis. A 3-bp deletion in the DYT1 gene causes early onset, generalized torsion dystonia (TD), and mutations in the GTP cyclohydrolase I and the tyrosine hydroxylase genes result in dopa-responsive dystonia (DYT5). A missense change in the D2 dopamine receptor in one large family (DYT11) has recently been implicated in myoclonus-dystonia. Furthermore, seven other loci for dystonia genes have been mapped to chromosomal regions, including a locus for a mixed dystonia phenotype (DYT6), one form of focal dystonia (DYT7), three types of paroxysmal dystonia (DYT8–10), X-linked dystonia-parkinsonism (DYT3), and rapid-onset dystonia-parkinsonism (DYT12). No positive linkage results have yet been obtained for autosomal recessive TD (DYT2) and several other families of different types of dominantly inherited TD (DYT4). In addition, hereditary secondary dystonia may occur as part of familial diseases of the basal ganglia, metabolic and storage disorders, and various X-linked and other familial neurodegenerative syndromes affecting the basal ganglia. It may be anticipated that the traditional clinical and etiological classifications of dystonia will increasingly be replaced by a genetic one and that the identification of more dystonia genes may lead to a better understanding of these largely nondegenerative disorders.
    Notes: Zusammenfassung Gegenwärtig lassen sich 12 Typen von primären Dystonien (DYT1 – 12) genetisch unterscheiden. Die Deletion dreier Basenpaare im DYT1-Gen verursacht die generalisierte Torsionsdystonie (TD) mit frühem Beginn. Weiterhin konnten Mutationen im GTP-Zyklohydrolase-I- und im Tyrosinhydroxylase-Gen gefunden werden, die in Zusammenhang mit Dopa-responsiver Dystonie (DYT5) stehen, sowie eine mit myoklonischer Dystonie assoziierte Sequenzveränderung im D2-Dopaminrezeptor (DYT11). Außerdem wurden 7 weitere Dystonieloki kartiert, darunter die für einen gemischten Dystoniephänotyp (DYT6), eine Form der fokalen Dystonie (DYT7), 3 Typen von paroxysmaler Dystonie (DYT8–10), das X-chromosomal vererbte Dystonie-Parkinson-Syndrom (DYT3) und das Dystonie-Parkinson-Syndrom mit plötzlichem Beginn (DYT12). Für die autosomal-rezessive TD (DYT2) und einige größere Familien mit verschiedenen Formen dominant vererbter TD (DYT4) konnten bislang noch keine positiven Kopplungsstudien durchgeführt werden. Zusätzlich kommen erbliche, aber sekundäre Dystoniesyndrome im Rahmen von familiären Basalganglienerkrankungen, Stoffwechselstörungen und Speicherkrankheiten sowie verschiedener X-chromosomal vererbter und anderer familiärer neurodegenerativer Syndrome vor. Es ist anzunehmen, dass die klassische Einteilung der Dystonien nach klinischen und ätiologischen Kriterien mehr und mehr durch eine genetische ersetzt werden wird. Hierbei kann die Identifikation weiterer Dystoniegene zu einem besseren Verständnis dieser größtenteils nicht-degenerativen Erkrankungen beitragen.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Histochemistry and cell biology 91 (1989), S. 221-226 
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The efficiency of various postembedding procedures for actin immunogold detection was compared using testicular tissue as a model. Whatever the fixative, testes embedded in LR White resin or in Lowicryl K4M showed few differences as regard ultrastructural preservation and gave similar actin antigenicity preservation. A purified polyclonal antibody (IgG) and a monoclonal antibody (IgM) visualized with gold secondary antibody yielded high labeling intensity whereas the IgG-protein-A gold association was less efficient. Crude antisera gave a low specific staining/background ratio. Samples of testes, fixed in different conditions, were also embedded in Epon, omitting propylene oxide and lowering polymerization temperature to 40°–50° C. This slight modification improved ultrastructural preservation which was better than with hydrophilic resins, as well as made possible immunogold detection of actin though antigenicity preservation was lesser than with these resins. Thus, in Epon embedded samples actin labeling, using IgG antiactin-gold secondary antibody, was similar to that observed after hydrophilic resin-protein-A gold procedures. In addition to actin labeling of various somatic cells it was confirmed that actin is a consistent component of the subacrosomal space of spermatids during the greater part of spermiogenesis in rat.
    Type of Medium: Electronic Resource
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