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  • Electronic Resource  (14)
  • 1975-1979  (14)
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of medicinal chemistry 22 (1979), S. 301-306 
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Nuclear and Particle Science 26 (1976), S. 385-456 
    ISSN: 0066-4243
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Meccanica 10 (1975), S. 183-187 
    ISSN: 1572-9648
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Summary The problem of optimality of Lyapunov Functionals is posed in terms of the requirements of a specific problem. The optimizationprocess is based on a method used to construct Lyapunov Functionals called “Path Integral Synthesis” proposed by the authors. By starting with a gradient of a functional, defined in terms of a set of free parameters, the optimization procedure is performed by choosing those free parameters to optimize (in the term of the requirements of the problem) the resulting stability region in the space of the physical parameters of the problem. Practical applications to linear parabolic problems are performed in order to illustrate such procedure.
    Notes: Sommario Il problema dell'ottimizzazione dei Funzionali di Lyapunov è posto nei termini specifici del problema particolare. Il processo di ottimizzazione è basato sul “Path Integral Synthesis,” un metodo per la costruzione di Funzionali di Lyapunov elaborato dagli autori. Partendo da una generica forma del gradiente del funzionale definito in termini di un gruppo di parametri, il procedimento di ottimizzazione viene effettuato scegliendo questi parametri in modo da ottimizzare (nei termini specifici del problema) la regione di stabilità nello spazio dei parametri fisici che regolano la stabilità del problema. Applicazioni a problemi pratici descritti da equazioni lineari paraboliche sono svolte per illustrare il procedimento.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Anatomy and embryology 157 (1979), S. 291-309 
    ISSN: 1432-0568
    Keywords: Chick embryo ; Leg bud ; Cell migration ; Myogenic stem cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The migration of myogenic stem cells into the leg anlagen of chick embryos between stages 16–20 of Hamburger and Hamilton was examined. SEM and TEM studies reveal that cell migration starts at stage 16 from the just-formed somites 26–28. The migrating myogenic cells are elongated and oriented in a medio-lateral direction. The leading ends branch into filopodia which contact a fibrillar network. At first, single cells migrate; later on the cells leaving the ventro-lateral edge of the dermatome migrate in strands and have specialized contacts between them. After reaction with ruthenium red and concanavalin A the migrating cells show a thick surface coat to which ruthenium red-positive particles are attached. The surface coat may be important in the interactions among the migrating cells as well as between the cells and the substrate. The migration of myogenic stem cells was found to take place in a matrix of collagenous fibrils and ruthenium red-positive particles, probably containing glycosaminoglycans. At the onset of migration the fibrillar network exhibits a preferred mediolateral orientation. Therefore, it may be concluded that this alignment of the fibrils influences the direction of cell migration.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Anatomy and embryology 153 (1978), S. 179-193 
    ISSN: 1432-0568
    Keywords: Chick embryo ; Origin of wing musculature ; Myogenic stem cells ; Cell migration ; Collagen fibrils
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In chick embryos undifferentiated myogenic stem cells migrate from the ventrolateral somite respectively dermatome edge into the prospective wing region after the second day of incubation. At first, single cells that are elongated in mediolateral direction, later also small groups of cells, are found in the space between somites and somatopleura at the wing bud level. The leading ends of the migrating cells are formed like finger-shaped lobopodia as well as flattened lamellipodia from which thin filopodia arise. The main structural features of the cell processes are microtubules and microfilaments predominantly oriented parallel to the long axis of the cells. The filopodia are found to be in close connection with the surrounding network of collagen fibrils. Since the main strands of the fibrils show a mediolateral orientation, it may be assumed that the direction of cell migration depends on the arrangement of the collagen fibrils.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Anatomy and embryology 150 (1977), S. 171-186 
    ISSN: 1432-0568
    Keywords: Avian embryo ; Wing bud myogenesis ; Somitic cells ; Quail ; Chick marker system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Interspecific grafts of somites, as well as parts of the somatic plate mesoderm, have been made between quail and chick embryos (stages 12–14 H.H.) at the level of the prospective wing bud in order to examine the relationship between somites and wing bud myogenesis. The stability of the natural quail nuclear labelling makes it possible to follow the developmental fate of grafted mesodermal cells in the host embryo. Embryos examined after subsequent incubation periods of 3–7 days show the following distribution of somatic and somitic cells within the wing bud: as soon as the three zones of different cell density within the mesoderm can be distinguished, cells of somitic origin are limited to the prospective myogenic are which is made up of a mixed population of somatic and somitic cells, whereas the prospective chondrogenic area as well as the subectodermal zone only consists of cells originated from the somatic plate mesoderm. After further incubation, single muscle blastema are present which were also seen to be a mixture of somatic and somitic cells. The cells of muscular bundles are of somitic origin, while the muscle connective tissue cells are derived from the somatic plate mesoderm. After grafting into the coelomic cavity or on the chorio-allantoic membrane, fragments of the somatic plate mesoderm previously isolated from quail embryos (stage 14 H.H.) at the level of the prospective wing bud exhibit well developed skeletal elements, but fail to differentiate any musculature. These experimental investigations support previous evidence for a somitic origin of wing bud myogenic cells. Histological and scanning electron microscopic studies of the brachial somites and the adjacent somatic plate mesoderm of chick embryo (stages 13–15 H.H.) reveal that migration of still undifferentiated somitic cells into the brachial somatic plate mesoderm begins to take place in embryos at stage 14.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 31 (1975), S. 1083-1086 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The early differentiation of the connective tissue was investigated in the perinotochordal zone of 2–3 day-old chick embryos. After characterizing the different tissue components by transmission electron microscopy, their arrangement and distribution were examined by SEM. The results are discussed with regard to the role of the extracellular material in embryonic tissue interactions.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 34 (1978), S. 241-242 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The origin of the structures of the abdominal wall in avian embryos was studied by using the quail-chick marker system. It was concluded that the muscles originate from somitic cells while tendons, fasciae and the intramuscular fibroblasts, as also the remaining connective tissue, derive from the somatic plate mesoderm.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 34 (1978), S. 893-893 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 34 (1978), S. 514-516 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The formation of the myotomes to chick embryos was studied by using experimental and scanning electron microscope techniques. With the aid of the quail-chick marker system, it was demonstrated that the dermatome gives rise to the myotome plate. SEM studies support the conclusion that the myotome cells originate only from the edges of the dermatome.
    Type of Medium: Electronic Resource
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