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  • Articles  (22)
  • Development  (22)
  • Springer  (22)
  • American Geophysical Union (AGU)
  • Annual Reviews
  • 2005-2009
  • 1980-1984  (22)
  • 1935-1939
  • 1983  (22)
  • Biology  (22)
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  • Articles  (22)
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  • Springer  (22)
  • American Geophysical Union (AGU)
  • Annual Reviews
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  • 2005-2009
  • 1980-1984  (22)
  • 1935-1939
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  • 1
    Electronic Resource
    Electronic Resource
    Suitability of selected leguminous plants for development of Maruca testulalis larvae (1983)
    Springer
    Entomologia experimentalis et applicata 34 (1983), S. 174-178 
    Details
    ISSN: 1570-7458
    Keywords: Lepidoptera ; Pyralidae ; Maruca testulalis ; Pod borer ; Development ; Nutritional suitability ; Host plant ; Crotalaria ; Vigna unguiculata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Les possibilités de développement larvaire de Maruca testulalis sur les fleurs de huit espèces végétales ont été examinées en laboratoire. La comparaison a porté sur Crotalaria retusa, C. juncea, C. saltiana, C. misereniensis, C. mucronata, C. amazonas, Cajanus cajan et l'hôte principal de cette chenille, Vigna unguiculata. En tenant compte de la mortalité larvaire et des indices de croissance (G.I.), ces plantes ont été divisées en trois catégories principales: 1 celles provoquant une mortalité larvaire de 0–30% et ayant des G.I. ≥60%, constituent les plantes hôtes convenables (Vigna unguiculata seule); 2 les plantes qui provoquent une mortalité larvaire de 30≤50% et ont des G.I. de 30 à 60% de la plante hôte principale (Cajanus cajan, Crotalaria amazonas, C. saltiana, C. mucronata; 3 les plantes qui causent 50–100% de mortalité larvaire et dont les G.I. sont inférieurs à 30% de la plante hôte principale (Crotalaria retusa, C. juncea, C. misereniensis). Les résultats déjà publiés sur les choix du lieu de ponte des femelles et l'utilisation de C. juncea comme plante piège, sont discutés à la lumière de ces données nouvelles.
    Notes: Abstract Flowers of eight plant species were evaluated under laboratory conditions for their suitability as larval growth media for the cowpea pod borer, Maruca testulalis. The plants tested were Crotalaria retusa, C. juncea, C. saltiana, C. misereniensis, C. amazonas, Cajanus cajan and the principal host of the borer, Vigna unguiculata (cowpea), was included for comparison. Based on the data obtained on larval mortality and growth indices (GI) the plants were divided into 3 categories namely: I: Those causing 0–30% mortality and having GI value ≥60% form suitable host plants. This group only included V. unguiculata. — II: Those plant species causing 30≤50% larval mortality and having GI value 30%≤60% of the principal host plant (Cajanus cajan, Crotalaria amazonas, C. saltiana, C. mucronata). This group of species is marginally suitable as hosts. — III: Plants causing 50–100% larval mortality and having GI value ≤30% of principal host plant (C. retusa, C. juncea and C. misereniensis). Previously published data on the oviposition preference of the adult moth are discussed in the light of the present findings and the use of C. juncea as a possible trap crop.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00338666
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  • 2
    Electronic Resource
    Electronic Resource
    Cyromazine-sensitive stages of housefly development: Influence of penetration, metabolism and persistence on potency (1983)
    Springer
    Entomologia experimentalis et applicata 34 (1983), S. 251-256 
    Details
    ISSN: 1570-7458
    Keywords: Cyromazine ; Musca domestica ; Housefly ; Development ; Sensitivity ; Penetration ; Insect growth regulator
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé La cyromazine (N-cyclopropyl-1,3,5-triazine-2,4,6-triamine or CGA-72662) est un puissant inhibiteur de développement chez Musca domestica Le traitement des adultes par voie orale n'altère pas l'éclosion des œufs, mais inhibe fortement le développement des larves. Incorporée au milieu larvaire, elle donne une DL50 de 0.11 ppm. La sensibilité des pupes, traitées par application topique, décroit rapidement avec l'âge et est dépendante du solvant utilisé. Une heure après pupaison et avec le tétrahydrofuran comme vecteur, la DL50 est de 3 μg/g, soit 0.2 μg/g pour la pupe sans puparium. Comparé au méthanol. le tétrahydrofuran facilite la pénétration de la cyromazine pendant ce stade critique. La pénétration est également un facteur de la résistance des pupes agées. La toxicité de la cyromazine apparait rait donc principalement dépendante de sa vitesse de pénétration et de son accumulation dans l'organisme plutôt que de son métabolisme. Juste après pupaison, la jeune pupe chez M. domestica s'avère être un matériel sensible et pratique pour l'étude du mode d'action de la cyromazine.
    Notes: Abstract Cyromazine is a potent inhibitor of housefly (Musca domestica L.) larval development when administered orally to adults or incorporated into larval media, and of pupal metamorphosis on topical application shortly before or after pupariation. Pupae are most sensitive to cyromazine within 1 hr after pupariation and with tetrahydrofuran as the carrier solvent, giving topical LD50 values of 3 μg/g for the total puparium plus pupa and 0.2 μg/g calculated for the pupa only. Tetrahydrofuran is more effective than methanol in facilitating rapid cyromazine penetration during this critical pupal stage. The rate of cyromazine penetration or accumulation at sensitive stages appears to be more critical than the extent of metabolism in limiting cyromazine toxicity. Houseflies shortly after pupariation provide a sensitive and convenient organism for studies on cyromazine mode of action.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00186921
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  • 3
    Electronic Resource
    Electronic Resource
    Dye-coupling between blastomeres in early embryos ofPatella vulgata (mollusca, gastropoda): Its relevance for cell determination (1983)
    Springer
    Development genes and evolution 192 (1983), S. 262-269 
    Details
    ISSN: 1432-041X
    Keywords: Mollusca ; Interaction ; Development ; Dye-coupling ; Gap junctions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary During the early development of the molluscPatella, the dorsoventral axis is established after the fifth cleavage due to direct interaction between the animal micromeres and one of the vegetal macromeres. This vegetal macromere is thereby induced to become the mesentoblast mother cell (3D). In this study we have examined intercellular communication in earlyPatella embryos by monitoring the transfer of the fluorescent dye, Lucifer Yellow, upon iontophoretic injection into blastomeres between the second and sixth cleavage. Up to the fifth cleavage dye transfer is detectable neither inin toto embryos nor in serial sections. Shortly after the fifth cleavage dye-coupling between blastomeres becomes apparent. This occurs approximately 40 min before the interaction between animal micromeres and the future mesentoblast mother cell. Inspection of serially sectioned embryos after dye-iontophoresis in either animal micromeres or in the central macromere 3D showed the absence of direct dye-transfer between these cells at the stage of interaction. The reduced rate of dye-transfer from the 3D macromere to its dorsal neighbour 2d2 suggests a bilateral symmetrical transfer pattern, the axis of which corresponds with the dorsoventral axis at the sixth cleavage. Cell deletion experiments demonstrated that the establishment of dye-coupling between the vegetal macromeres occurs independently of the interaction between animal and vegetal blastomeres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848658
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  • 4
    Electronic Resource
    Electronic Resource
    Antheridiol, RNA polymerase II and sexual development in the aquatic fungus, Achlya (1983)
    Springer
    Archives of microbiology 134 (1983), S. 314-319 
    Details
    ISSN: 1432-072X
    Keywords: Antheridiol ; RNA Polymerase II ; Development ; ELISA ; Achlya ; Transcriptional regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The fungus, Achlya, is one of the most primitive eukaryotes known to secrete and respond to diffusible steroid sex hormones (pheromones). Antheridiol, which is produced by female strains of Achlya induces male strains to differentiate male sex organs. Induction of male strains with antheridiol elicits several changes in macromolecular synthesis including a quantitative enhancement in the synthesis of poly adenylated messenger RNA. We have examined whether this quantitative change is due to the regulation of RNA polymerase II. The level of polymerase increases as a response to the pheromone. This was examined using two different approaches, one of which included an extremely sensitive enzyme-linked immunosorbant assay (ELISA). Furthermore, the specific activities of polymerase II preparations isolated from pheromone-stimulated cultures was significantly higher than the specific activities of enzyme preparations isolated from control. A comparison of the polypeptide subunit composition of polymerase II preparations isolated from both pheromone-treated and control cultures on SDS polyacrylamide gels indicated no qualitative differences. Apparent differences in the stoichiometry of two specific subunits were reproducibly observed. The subunits of 140,000 and of 69,000 stained much more intensely in RNA polymerase II preparations isolated from 4h antheridiol-treated cultures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00407809
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  • 5
    Electronic Resource
    Electronic Resource
    Control of the formation of bacteriochlorophyll, and B 875- and B 850-bacteriochlorophyll complexes in Rhodopseudomonas sphaeroides mutant strain H5 (1983)
    Springer
    Archives of microbiology 136 (1983), S. 312-316 
    Details
    ISSN: 1432-072X
    Keywords: Rhodopseudomonas sphaeroides ; Continuous culture ; Control ; Bacteriochlorophyll ; Pigment protein complexes ; 5-Aminolevulinic acid ; Development ; Light
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rhodopseudomonas sphaeroides mutant H5 lacking 5-aminolevulinic acid synthase was employed to study the control of the formation of total bacteriochlorophyll as well as of the B875- and B850-bacteriochlorophyll protein complexes. The organisms were grown phototrophically in a chemostat where cell protein formation was limited by iron ions and bacteriochlorophyll by 5-aminolevulinic acid. 0.07 mol of bacteriochlorophyll was formed per mol of 5-aminolevulinic acid consumed. This stoichiometric relationship was not influenced by a twelve-fold variation in light energy flux. However, cell protein levels increased and, consequently, cellular specific bacteriochlorophyll contents decreased with increases in light energy flux. The ratio of B875- to B850-pigment protein complexes was inversely proportional to the velocity of 5-aminolevulinic acid supply (mol per cell protein and time) which in this system equals the velocity of 5-aminolevulinic acid consumption and the velocity of bacteriochlorophyll formation. Light had no direct effect on the ratio of B875- per B850-pigment complexes but an indirect effect via its control of protein formation. Changes in the ratio of the two pigment complexes resulted from the fact that significantly lower amounts of 5-aminolevulinic acid supplied per protein and time were required to saturate the system assembling the B875-complexes than that assembling the B850-complexes. The data suggest lack of light-dependent control in the formation of bacteriochlorophyll and its complexes subsequent to the 5-aminolevulinic acid pool.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425223
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  • 6
    Electronic Resource
    Electronic Resource
    Ontogenetic development of the pineal organ, parapineal organ, and retina of the three-spined stickleback, Gasterosteus aculeatus L. (Teleostei) (1983)
    Springer
    Cell & tissue research 233 (1983), S. 593-609 
    Details
    ISSN: 1432-0878
    Keywords: Pineal organ ; Parapineal organ ; Retina ; Photoreceptors ; Development ; Gasterosteus aculeatus L. (Teleostei)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ontogenetic developments of the pineal organ, parapineal organ, and retina were studied by the use of light and electron microscopy in embryos and fry of the teleost, Gasterosteus aculeatus, from 60 to 168 h after fertilization. Sixty to 66 h after fertilization, the primordium of the pineal complex is discernible in the diencephalic roofplate; the parapineal anlage is located rostral to the pineal anlage. Photoreceptor cells endowed with outer segments are present in the embryonic pineal organ already after 72 h, whereas outer segments of retinal photoreceptors could not be demonstrated before 144 h (hatching occurs between 120–144 h). Furthermore, neuropil formations with synaptic specializations are present in the rostral part of the pineal organ 108 h after fertilization. At 72 h, the embryonic parapineal parenchyma is already differentiated into parapinealocytes, which give rise to the parapineal tract, and glia-resembling elements. Although parapinealocytes carry cilia (9 × 2 + 0), only a single outer segment of the photoreceptor type could be demonstrated in the parapineal organ of one adult stickleback. Photoreceptors present in the pineal organ of unhatched embryos are hardly involved in visual functions, but may already at this early developmental stage serve as photoneuroendocrine transducers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00212227
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  • 7
    Electronic Resource
    Electronic Resource
    Spatial relationships between fibroblasts during the growth of rat-tail tendon (1983)
    Springer
    Cell & tissue research 234 (1983), S. 17-29 
    Details
    ISSN: 1432-0878
    Keywords: Tendon (rat) ; Development ; Fibroblasts ; Collagen ; Extracellular space
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Sections of tendons from the base of the tail of rats were taken at eight time intervals from 18 days in utero until 244 days after birth and were examined in the electron microscope. For each time period, measurements were made of the relative area of fibroblasts, collagen and interstitial material, of the number of fibroblasts per unit area of tendon and of the average area of individual fibroblasts. The spatial arrangement of fibroblasts in the tendon sections was described quantitatively using the “nearest neighbor” method. Initially there was a rapid increase in the area of collagen accompanied by a decrease in the area occupied by fibroblasts but after 104 days of age these values changed very little. The numbers of fibroblasts per unit area decreased steadily from the embryo until 104 days whereas the average size of each cell increased to reach a maximum area at 40 days of age and then declined. At all time intervals cells were arranged in a regular, dispersed pattern across the tendon fascicles. Growth in width of the rat tail appears to involve the secretion of collagen and other intercellular material symmetrically around each fibroblast, so as to gradually separate the cells until a stage is reached at which cells are sufficiently far apart that there is little contact between adjacent cell processes. This may interfere with the integration of metabolic activity in the tissue. As a consequence, there is shrinkage of the cell bodies and a reduction in secretory activity so that, between 55 and 104 days of age, the tendon enters a period of terminal senescence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217399
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  • 8
    Electronic Resource
    Electronic Resource
    Ultrastructural immunocytochemical localization of fibronectin in the developing rat lung (1983)
    Springer
    Cell & tissue research 234 (1983), S. 165-177 
    Details
    ISSN: 1432-0878
    Keywords: Fibronectin ; Lung ; Development ; Ultrastructure ; Immunocytochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In a previous study changes in the macrodistribution of fibronectin during rat-lung development were examined. Using the peroxidase-antiperoxidase immunocytochemical technique, we have demonstrated the presence of fibronectin in embryonic, neonatal, and adult rat lung at the ultrastructural level. In the embryo, fibronectin is found both in an intra-and extracellular association with isolated pneumoblasts, and in a periodic distribution along the basal lamina. The neonate displays fibronectin in an intracellular association with early type-I cells and on their basal and luminal surfaces, but not in association with type-II cells. Neonatal basal lamina is diffusely labeled by anti-fibronectin antiserum. Fibronectin in adult tissue is found both intracellularly and on the basal and luminal surfaces of type-I cells but not in type-II cells. The basal lamina and interstitial connective tissue are slightly or non-reactive. These observations confirm and extend our initial suggestion that fibronectin is involved in rat-lung development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217410
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  • 9
    Electronic Resource
    Electronic Resource
    Electron microscopy of extracellular materials during the development of a sea star, Patiria miniata (Echinodermata: Asteroidea) (1983)
    Springer
    Cell & tissue research 234 (1983), S. 193-200 
    Details
    ISSN: 1432-0878
    Keywords: Sea star ; Development ; Cuticle ; Extracellular materials ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of conspicuous extracellular materials during the life history of a sea star (Patiria miniata) is described. The outer surface of the developing sea star is covered by two morphologically different cuticles that appear sequentially during ontogeny. The primary cuticle, which is about 120 nm thick and two-layered, is present from mid-blastula through the end of the larval stage. The secondary cuticle, which is about 1 μm thick and three-layered, first appears on the epidermis of the rudiment region of the larva and, after metamorphosis, covers the entire epidermis of the juvenile and adult stages. During ontogeny, there are only two conspicuous gut cuticles: the first lines the newly invaginated archenteron at the start of the gastrula stage, and the second lines the esophagus during the larval stage. A blastocoelic basal lamina first appears at mid-blastula and persists as subectodermal and subendodermal basal laminae. Ruthenium red-positive granules are detectable between the lateral surfaces of adjacent ectodermal cells during part of the gastrula stage; this transient intercellular material may possibly aid in lateral adhesion between cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217412
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  • 10
    Electronic Resource
    Electronic Resource
    Ionic currents traverse growing hyphae and sporangia of the mycelial water moldAchlya debaryana (1983)
    Springer
    Protoplasma 115 (1983), S. 65-69 
    Details
    ISSN: 1615-6102
    Keywords: Achlya ; Development ; Electrophysiology ; Sporogenesis ; Vibrating probe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary This study explores natural ionic currents traversing hyphae and sporangia during the asexual life cycle of the mycelial water moldAchlya debaryana. Ionic current enters the extending hyphal apex at a density of 1–2μAcm−2 in the form of current spikes. Current normal to the surface enters hyphae up to 600 μm behind the growing tip. A large efflux of current lasting 1–2 minutes occurs during the homogeneous stage of sporangium development. Spore release is accompanied by a few spikes of inward current. The results obtained so far suggest that the developmental processes of hyphal elongation and sporangium formation in the asexual life cycle of water molds are correlated with particular ionic currents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01293582
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  • 11
    Electronic Resource
    Electronic Resource
    Estimates of egg and viable embryo production in a lacustrine perch, Perca fluviatilis (1983)
    Springer
    Environmental biology of fishes 8 (1983), S. 3-16 
    Details
    ISSN: 1573-5133
    Keywords: Mortality ; Incubation ; Hatching ; Temperature ; Carex rostrata ; Development ; Fertilisation ; Fish ; Percidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Egg production and survival of perch in the embryonic period, and spawning observations at Lochs Kinord and Davan in Scotland are described. Spawning began on 20 April in both lochs at water temperatures of 9–11°C and continued for 10 days. The length of the incubation period was related to water temperature and was described by the regression equation: log10 days to hatch = 3.0286 − 1.6728 log10 incubation temperature in °C. Perch shed eggs in a single opaque strand and egg ribbons could be censused at each loch during the spawning period. The pattern of egg strand distribution and substrate used, predominantly the macrophyte Carex rostrata, is described. From eggs collected in the lochs it is estimated that 95.3% of embryos were viable, the nonviable portion comprising 0.5% unfertilised eggs, 2.4% dead and 1.8% with abnormalities. Potential egg deposition was 13.5 and 9.7 eggs m−2 at Kinord in 1976 and 1977 respectively and 9.2 m−2 at Davan in 1976. Egg production as dry weight was assessed as 3.3 and 2.4 mg m−2 for Kinord in 1976 and 1977, and 2.2 mg m−2 for Davan in 1976. Survival form spawning to hatching in all situations was estimated as 95.3% while the figure calculated for the period from hatching to recruitment to the pelagic larval stock varied from 11.5 to 73.2%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00004941
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  • 12
    Electronic Resource
    Electronic Resource
    Cytodifferentiation of the paraventricular nucleus in the chick embryo (1983)
    Springer
    Cell & tissue research 229 (1983), S. 281-297 
    Details
    ISSN: 1432-0878
    Keywords: Paraventricular nucleus ; Hypothalamus ; Development ; Golgi study ; Ultrastructure ; Chick embryo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The developmental changes in the cytoarchitecture of the hypothalamic paraventricular nucleus of the chick embryo were studied with particular emphasis on the differentiation of the magnocellular neurons. These cells can be distinguished from the parvocellular elements starting from stages 34–35 (Hamburger and Hamilton 1951) in Golgi-impregnated specimens. At the same stages, electron microscopy reveals dense-core granules, resembling the characteristic elementary granules of the neurosecretory material in the cytoplasm of the larger neurons. In addition, a few immature synapses were observed on these magnocellular perikarya. The present observations suggest that the early onset of neurosecretion in this area may be neurally regulated during early phases of development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00214976
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  • 13
    Electronic Resource
    Electronic Resource
    Calcium-binding protein in the developing rat cerebellum (1983)
    Springer
    Cell & tissue research 233 (1983), S. 389-402 
    Details
    ISSN: 1432-0878
    Keywords: Calcium-binding protein (CaBP) ; Immunocytochemistry ; Rat cerebellum ; Development ; Vitamin D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Specific antibodies raised against a human 28 000 dalton cerebellar calcium-binding protein (CaBP) were used in an immunocytochemical study during development of the rat cerebellum. Both light and electron microscopy showed (1) that labelling was entirely restricted to the Purkinje cells, (2) that it appeared very early in Purkinje cell development, (3) that the entire cell was labelled from the tip of the smallest dendrites to the axonal terminals, and (4) that with increasing age, the immunoreaction appeared to be progressively restricted to the cell and organelle membranes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238305
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  • 14
    Electronic Resource
    Electronic Resource
    Microinjection of Lucifer yellow CH into sea urchin eggs and embryos (1983)
    Springer
    Cell & tissue research 234 (1983), S. 309-318 
    Details
    ISSN: 1432-0878
    Keywords: Division ; Dye coupling ; Development ; Embryo ; Microinjection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Eggs and embryos of Arbacia punctulata were microinjected with the fluorescent dye, Lucifer yellow CH, using a simple pressure injection system. When injected into eggs that were subsequently fertilized, the dye was distributed throughout all cells of the developing embryo. If one cell of a two-cell embryo was injected, dye did not diffuse into the uninjected blastomere. During subsequent development, all progeny of the injected cell contained dye resulting in an embryo that was half-fluorescent. Blue light irradiation of a two-cell embryo, one cell of which had been injected with Lucifer yellow, caused the injected blastomere to stop further divisions while the uninjected blastomere developed normally and was free of dye. These results indicate that the first two blastomeres of Arbacia embryos are not electrically coupled, nor up to the time of hatching, is there any coupling between cells in one half of the first cleavage plane and cells in the other half.
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    URL: http://dx.doi.org/10.1007/BF00213770
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  • 15
    Electronic Resource
    Electronic Resource
    Development of the larval nervous system of the sand dollar, Dendraster excentricus (1983)
    Springer
    Cell & tissue research 229 (1983), S. 145-154 
    Details
    ISSN: 1432-0878
    Keywords: Pluteus ; Nervous system ; Development ; Larva ; Echinoidea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Transformation of the gastrula to the pluteus includes development of the ability of the larva to control the direction of ciliary beat and coordinate activities of the ciliary band with activities of the esophageal muscles (48–60 h, 15°C). Glyoxylic acid-induced fluorescence shows several cells of the animal plate to contain catecholamines in the 36-h gastrula. As the ectoderm thickens to form the ciliary band (36–48 h), the catecholamine-containing cells increase in number and occur dispersed throughout the band. Tissues with the ultrastructural characteristics of nerves first become apparent associated with the ciliary band in 60-h larvae. The coincident development of coordinated behaviour and the appearance of cells with ultrastructural and histochemical characteristics of nerves suggests that the larval nervous system is derived at least in part from cells of the animal plate and develops in association with the ciliary bands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217887
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  • 16
    Electronic Resource
    Electronic Resource
    6-OHDA-induced ectopia of external granule cells in the subarachnoid space covering the cerebellum (1983)
    Springer
    Cell & tissue research 230 (1983), S. 309-336 
    Details
    ISSN: 1432-0878
    Keywords: Neural ectopia ; Cerebellum ; Granule cells ; Development ; 6-Hydroxydopamine ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The present report describes the genesis, development and topographical distribution of ectopic cells of the external granular layer in the subarachnoid space covering the rat cerebellum. Following one intracisternal injection to newborn rats of 100 μg 6-hydroxydopamine (6-OHDA), the meningeal cells degenerate and are removed by phagocytosis within 24 h post injection (p.i.), leaving the cerebellar cortex without a pia-arachnoid cover. Defects appear in the basal lamina investing the cerebellar cortex 3 to 5 days p.i., and both external granule cells and ‘sprouts’ from Bergmann-glia endfeet grow into the subarachnoid space. The latter form large, flat glial lamellae and cover extensive areas of the denuded cerebellar surface, although they do not form a glial scar over the exposed neuropil of the cerebellar cortex. The numbers of ectopic external granule cells increase within the subarachnoid space both by proliferation and a continuous efflux of cells from the cerebellar cortex. They migrate, aggregate, and ultimately develop into granule, stellate and basket cells, the morphology of which is indistinguishable from their counterparts in situ; they make specific afferent and efferent connections, both among themselves and with the underlying cerebellar cortex and brainstem. The distribution of ectopic external granule cells and their derivatives is restricted to the anterior vermal fissures and the vermal-hemispheric junctions. The present results indicate that external granule cells and their derivatives are capable of both differentiating normally and surviving in the subarachnoid space if they become associated with glial cells and establish synaptic connections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00213807
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  • 17
    Electronic Resource
    Electronic Resource
    The freeze-fractured median eminence (1983)
    Springer
    Cell & tissue research 233 (1983), S. 81-97 
    Details
    ISSN: 1432-0878
    Keywords: Neuroendocrine system ; Median eminence ; Neurohemal contact zone ; Development ; Freeze-fracture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The neurohemal contact area of the median eminence was examined in adult, young, neonatal, and fetal rats in freeze-fracture preparations. While no specializations of the membranes of axonic terminals abutting on the perivascular space were observed, adjacent areas of the same membranes are rich in signs of hormone release. Signs of exocytosis are defined in the manner of Theodosis et al. (1978). Exocytotic pits with a single dense granule as a core are identified on P-faces along with mounds on corresponding E faces. These features appear near the time of birth, are especially numerous at 3 days, 3 weeks, and 5 weeks, and continue in lesser numbers into adulthood. Even more numerous and appearing even earlier, by the last day of fetal life, were P-face clusters of large particles usually in a pit, and pits without particles. These fall into 2 significantly different categories distinguished by the size of the pit. E face counterparts are large and small protuberances, respectively. Fenestrae of adult size and distribution are observed along the endothelium of portal vessels from the 20th day of fetal life on. Their frequency correlates well with other structural manifestations of a median eminence ready for the onset of functional activity at about the time of birth (Monroe and Paull 1974).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222234
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  • 18
    Electronic Resource
    Electronic Resource
    Ontogenetic studies on the topographical heterogeneity of somatostatin-containing neurons in rat hypothalamus (1983)
    Springer
    Cell & tissue research 233 (1983), S. 347-354 
    Details
    ISSN: 1432-0878
    Keywords: Development ; Somatostatin neuron ; Hypothalamus ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ontogeny of the somatostatin-containing neuron system was investigated by light-microscopic immunohistochemistry. During development, immunoreactive somatostatin-containing neurons arise from three discrete regions of the neuroepithelium of the third ventricle and show a chronological difference. The neurons are first evident within the third ventricle floor on day 12.5 of gestation; they move thereafter to the arcuate nucleus. The second generation occurs in the dorsal region of the arcuate nucleus during days 17.5–19.5; these neurons migrate sequentially into the arcuate-ventromedial nuclear region. The third generation is recognized in the neuroepithelial cell layer of the rostral hypothalamus on day 17.5 of gestation; these cells move to the periventricular area. This latter generation is most prominent during days 3–6 after birth, and some of the cells are seen sporadically even up to day 20. The first two generations give rise to the somatostatin neuron system in the arcuate-ventromedial nuclear region, while the latter gives rise to that in the rostral periventricular region in the adult rat hypothalamus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238301
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  • 19
    Electronic Resource
    Electronic Resource
    Neural control of embryonic acetylcholine receptor and skeletal muscle (1983)
    Springer
    Cell & tissue research 228 (1983), S. 1-12 
    Details
    ISSN: 1432-0878
    Keywords: Avian skeletal muscle ; Development ; Acetylcholine receptor ; Innervation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The manner by which motor neurons exert control over the distribution and number of acetylcholine receptors, and muscle development was investigated in the superior oblique muscle of white Peking duck embryos. Clusters of receptors in the normally developing muscle first appeared on day 10 of incubation as determined with I125 α-bungarotoxin autoradiography. The initial appearance of receptor clusters coincided with the arrival of motor nerve fibers in the muscle. Clusters of receptors also appeared in normal fashion in muscles made aneural by destruction of motor neurons on day 7. But after day 14 these clusters had disappeared and no new clusters were seen thereafter in the aneural muscle. Receptor clusters persisted throughout development in muscle in which neuromuscular transmission was blocked with either curare or botulinum toxin and in muscles denervated on day 10.5, i.e., shortly after the initial nerve-muscle contact but prior to the onset of muscle activity. A progressive increase in the total number of receptors and in the total amount of protein occurred during the course of normal development. However, the specific activity of the receptor protein declined sharply following innervation on day 10. The total number of receptors and the specific activity of the receptor was affected depending on whether the motor neurons were destroyed before or after innervation and following chronic blockade of neuromuscular transmission. The half-life of the receptor protein was similar in normal, aneural, and paralyzed muscles (26, 25, 26 h, respectively). Measurements of total protein indicated that essentially no muscle growth occurred in the complete absence of innervation. Paralyzed muscles continued to develop but at a slower pace.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206259
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  • 20
    Electronic Resource
    Electronic Resource
    Development of the capillary system in the neurohypophysis of the rat (1983)
    Springer
    Cell & tissue research 228 (1983), S. 685-696 
    Details
    ISSN: 1432-0878
    Keywords: Neurohypophysis (rat) ; Development ; Blood vessels ; Perivascular space
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The development of the vascular system in the neurohypophysis of the rat shows three periods of structural differentiation. The first period lasts until the 17th fetal day. During this period the superficial and the border plexuses are formed, and rapid vascularization of the neural lobe anlage takes place. The end of this period is marked by the formation of the perivascular space. The second period lasts from the 18th fetal day until the 10th day after birth. Its initial phase is characterized by the appearance of the first endothelial pores. During this period the formation of the internal capillaries proceeds, together with the maturation of the previously formed vascular elements. The third period lasts from the 10th postnatal day until the end of the first month after birth. At the end of this period the vascular net of the neural lobe has attained its fully developed state. The results of this study, together with data from previous investigations, lead to the conclusion that at the 18th fetal day the neural lobe displays signs of functional activity, and that the maturation of the vascular network in the neural lobe occurs more rapidly than the maturation of its other structural components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00211484
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  • 21
    Electronic Resource
    Electronic Resource
    Embryonic development of the smooth and striated musculatures of the chicken iris (1983)
    Springer
    Cell & tissue research 229 (1983), S. 37-59 
    Details
    ISSN: 1432-0878
    Keywords: Sphincter pupillae ; Smooth muscle ; Development ; Chicken
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Both smooth muscle and striated muscle are present in the iris of the chick embryo. The two types of musculature form mixed clusters which include undifferentiated cells and many nerve fibres, but they are structurally quite distinct and have different origins. The smooth musculature originates around the 10th day from a laminar invagination (iridial lamella) of the posterior epithelium, and is therefore an ectodermal derivative. The striated musculature appears slightly later than the smooth musculature and originates from undifferentiated cells which are regarded as mesenchymal. After the 15th day in ovo the smooth musculature stops growing; its cells become confined to an area very near the pupillary margin and many develop pigment granules in the sarcoplasm. Many smooth muscle cells seem to undergo regressive changes; however, cells with the typical appearance of visceral muscle cells are still present in the iris of 3-month-old chickens. High density of innervation and vasculari/ation, wide range of striated muscle fibre diameters, presence of lipid vacuoles and of large clusters of mitochondria in the striated fibres, occurrence of peripheral couplings of the sarcoplasmic reticulum, and presence of numerous fibroblast processes in the interstices between fibres, characterize the sphincter pupillae of the mature iris.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217879
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  • 22
    Electronic Resource
    Electronic Resource
    Synaptic development and microtubule organization (1983)
    Springer
    Cell & tissue research 231 (1983), S. 93-102 
    Details
    ISSN: 1432-0878
    Keywords: Synapses ; Microtubules ; Presynaptic dense projections ; Development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Using techniques for enhanced microtubular preservation (albumin pretreatment of Gray) occipital and pyriform cortices of rats were studied by electron microscopy at various stages of development. A close structural relationship was seen between microtubules (mts), focal membrane densities, synaptic vesicles, and presynaptic dense projections (pre-dps) during maturation. Mts were seen in the neonates to be focused onto the inner surface of immature axonic profiles merging or sometimes fragmenting there. Focal densities occur at these attachment sites and thereafter synaptic vesicles clothe the mts and abut onto these presumed primordial pre-dps. Thus, mts may contribute to the initial formation of pre-dps as well as their maintenance in the adult and may act to channel the first synaptic vesicles to the site of eventual synaptic contact and transmitter release.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215777
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