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  • Hydra  (7)
  • Tortricidae  (7)
  • gastrointestinal transit  (5)
  • Springer  (19)
  • Springer Nature
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  • Springer  (19)
  • Springer Nature
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  • 1
    Electronic Resource
    Electronic Resource
    Hickory shuckworm Cydia caryana: electroantennogram and flight tunnel studies of potential sex pheromone components (1987)
    Springer
    Entomologia experimentalis et applicata 44 (1987), S. 23-30 
    Details
    ISSN: 1570-7458
    Keywords: Lepidoptera ; Tortricidae ; Olethreutinae ; Cydia caryana ; sex pheromone ; electroantennogram ; flight tunnel ; behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Les réponses olfactives antennaires de Cydia caryana, mesurées par électroantennogrammes (EAG), aux alcools et acétates à carbones monounsaturés en positions 12 et 14, ont montré que le système conjugué de double liaison, (E)-8-, (E)-10- du dodecadien-1-ol acétate constitue un composé chimique strutural critique de la phéromone sexuelle de C. caryana. De plus, les acétates: (E)-8-dodecen-1-ol,(Z)-8-dodecen-1-ol,(Z)-9-dodecen-1-ol, et le (Z)-12-tetradecen-1-ol, se sont révélés en AEG comme des composés secondaires de la phéromone. L'étude par AEG de la relation dose-réponse a conduit à l'hypothèse de deux catégories de populations de récepteurs de phéromones. L'analyse comportementale des résponses des papillons mâles dans le tunnel de vol aux composés qui ont provoqués les plus forts AEG, on fait estimer que les acétates (E,E)-8,10-dodécadien-1-ol et (Z)-9-dodecen-1-ol ressemblent (ou sont) les constituants de la phéromone sexuelle de C. caryana; tandis que les (Z)-8-dodecen-1-ol et (E)-10-dodecen-1-ol sont, soit des paraphéromones, soit des constituants mineurs de la phéromone. La signification biologique du (Z)-12-tétradécen-1-ol a été difficile à interprêter avec les expériences en tunnel de vol.
    Notes: Abstract Electroantennogram (EAG) measurement of male Cydia caryana moth antennal olfactory response to monounsaturated 12 and 14 carbon alcohols and acetates indicated that the (E)-8-, (E)-10- conjugated double bond system of a dodecadien-1-ol acetate is a critical chemical structural component of the C. caryana sex pheromone. Additionally, EAG measurements implicated (E)-8-dodecen-1-ol acetate, (Z)-8-dodecen-1-ol acetate, (Z)-9-dodecen-1-ol acetate and (Z)-12-tetradecen-1-ol as potential minor pheromonal components. An EAG dosage-response study suggested that there were at least two heterologous populations of pheromone acceptors. Behavioral analysis of male moth response in a flight tunnel to compounds which evoked the stronger EAG responses suggested that (E,E)-8,10-dodecadien-1-ol acetate and (Z)-9-dodecen-1-ol acetate resemble or are C. caryana sex pheromonal components, while (Z)-8-dodecen-1-ol acetate and (E)-10-dodecen-1-ol acetate are either parapheromones or are minor pheromone components. Behavioral significance of (Z)-12-tetradecen-1-ol was difficult to interpret in the flight tunnel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00361305
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  • 2
    Electronic Resource
    Electronic Resource
    The role of nerve cell density in the regulation of bud production in hydra (1978)
    Springer
    Development genes and evolution 184 (1978), S. 95-108 
    Details
    ISSN: 1432-041X
    Keywords: Hydra ; Nerve cells ; Cell differentiation ; Budding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The role of nerve cell density in the regulation of bud production in hydra was examined. Animals with different rates of bud production were produced by altering the temperature, population density and illumination of their cultures. When the distribution of cell types was examined in animals with different rates of bud production, the density of nerve cells in those animals was found to be correlated with their rate of bud production. Transfer of animals from one environment to another resulted in immediate changes in the rate of differentiation of large interstitial cells into nerve cells. This suggests that the density of nerve cells may play a role in regulating the rate of bud production in hydra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848219
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  • 3
    Electronic Resource
    Electronic Resource
    Histological and ultrastructural studies of the basal disk of Hydra (1973)
    Springer
    Cell & tissue research 139 (1973), S. 1-27 
    Details
    ISSN: 1432-0878
    Keywords: Glandulomuscular cells ; Hydra ; Basal disk ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The glandulomuscular cells of Hydra are located exclusively in the basal disk. They are derived from epithelio-muscular cells which have been forced proximally. Light and electron microscopical studies show that prior to their destruction and elimination, the transformed epithelio-muscular cells (i.e. the glandulomuscular cells) undergo certain striking morphological and physiological changes. Golgi complexes and elements of rough E. R. increase remarkably in activity, and individually or jointly produce at least six types of morphologically different droplets. One additional type of droplet is thought to originate from neighboring digestive cells. Although the chemical nature of the individual droplets is uncertain, it is known that some are Alcian blue and PAS positive and contain hyaluronic acid. These evidences suggest the presence of an acid mucopolysaccharide material, the adhesive agent which attaches the animal to a substrate. The myonemes contain thick (200 Å in diameter) and thin (60 Å in diameter) filaments as in epithelio-muscular cells. There are also filaments of intermediate sizes and large fibers (770 Å in diameter). The myonemes are oriented radially with respect to the aboral pore and therefore in addition to contributing to the contraction and relaxation of the body column, they apparently regulate the opening and closing of the aboral pore. Although there is no evidence to substantiate the mechanism for transformation of epithelio-muscular cells to glandulomuscular cells as well as cell death of the latter cell types, these problems are discussed briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307458
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  • 4
    Electronic Resource
    Electronic Resource
    Histological and ultrastructural studies of the basal disk of Hydra (1973)
    Springer
    Cell & tissue research 139 (1973), S. 29-45 
    Details
    ISSN: 1432-0878
    Keywords: Nerve cells ; Hydra ; Basal disk ; Epithelial cells ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In addition to glandulomuscular cells, three other cell types are found in the basal disk of Hydra. These are interstitial cells, cnidoblasts and nerve cells. Although only a few of the two former cell types are recognized in this region, the observations from this study refute previous statements to the contrary. Nerve cells are concentrated in the basal disk where they form a type of “network” system, due to the presence of bipolar, tripolar and multipolar cells. In some specimens, they assume a circular arrangement around the base of the polyp. Using morphological criteria for identifying the three types of epidermal nerve cells (neurosensory, neurosecretory and ganglionic) in other body regions, only neurosensory and neurosecretory cells are observed in the basal disk. These are indistinguishable ultrastructurally from their respective counterparts in other regions. It is possible that ganglionic cells are also present in the basal disk, but there may be few such cells. It is suggested that the three cell types originate from the budding region and these precursor cells are then forced proximally. Interstitial cells, escaping their differentiative function, do not develop apparently into other cell types of the basal disk. Cnidoblasts contain normal nematocysts but their functional ability is uncertain. Neurosensory and neurosecretory cells arise directly and independently from interstitial cells in the budding region, as evidenced by the appearance of immature nerve cells in the peduncle and their absence in the basal disk. Although viable cells may be discarded from the basal disk, it is believed that most cells die in situ and are then eliminated. The possible role of nerve cells is discussed briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307459
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  • 5
    Electronic Resource
    Electronic Resource
    The role of the nervous system in regeneration, growth and cell differentiation in Hydra (1974)
    Springer
    Cell & tissue research 150 (1974), S. 231-247 
    Details
    ISSN: 1432-0878
    Keywords: Regeneration ; Nerve cells ; Neurosecretion ; Hydra ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Major ultrastructural changes in neurons were studied during sequential periods of hypostomal regeneration in Hydra. Some neurons remain unaffected except that at certain periods following amputation, they become more active in neurosecretory production. Other neurons in various stages of differentiation were also observed. Most emphasis was placed on degenerating neurons showing a loss of organelles and destruction of the perikarya. Certain large, membrane-bounded structures (up to 1.7 μ in diameter) suggested tentatively to be of a lysosomal-like nature, may be partly responsible for the degenerative process. The neurites of these cells first assume a beaded appearance and/or contain bulbous endings. The eventual isolated fragments of neurites contain typical membrane-bounded neurosecretory droplets (850/1700 Å in diameter) which disintegrate forming particulate materials (350 Å in diameter). Following complete disruption of the neurites, some of the granules accumulate in the extracellular spaces before they are disintegrated. From the data presented in this and the preceding paper, it is suggested that these particles, derived from neurosecretory droplets, may be responsible for the stimulation of: 1) interstitial cell differentiation into neurons, 2) the increased activity in neurosecretory production in normal cells, 3) the conspicuous increase in neurite length and consequently the exaggerated degree of anastomosis, and 4) the possible capacity of neurons to regenerate neurites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222172
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  • 6
    Electronic Resource
    Electronic Resource
    Histological and ultrastructural studies of the basal disk of Hydra (1975)
    Springer
    Cell & tissue research 162 (1975), S. 107-118 
    Details
    ISSN: 1432-0878
    Keywords: Basal disk ; Gastrodermis ; Mesoglea ; Hydra ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The gastrodermis and mesoglea of the basal disk of Hydra were investigated to conclude a three-part series of papers. The gastrodermis is composed of digestive cells (most predominant cell type), mucous and nerve cells (both immature and fully differentiated). The principal function of the digestive cells appears to be storage of protein, lipid and glycogen reserves which are utilized by neighboring cells. Mucous cells apparently use some of the reserves to synthesize their secretions which lubricate cells and prevent cell damage during egestion of waste through the aboral pore. The function of the gastrodermal nerve cells is uncertain. The mesoglea of the basal disk, contains the same structural components as seen in other regions of the polyp. It is reasonable to assume that it maintains the same function of cell adhesion and migration. As the mesoglea converges on the aboral pore, it loses its structural integrity and cells are sloughed off the column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223266
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  • 7
    Electronic Resource
    Electronic Resource
    The general occurrence of intramitochondrial crystals in Hydra cells (1976)
    Springer
    Cell & tissue research 171 (1976), S. 499-511 
    Details
    ISSN: 1432-0878
    Keywords: Mitochondria ; Hydra ; Crystals ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Intramitochondrial crystals are found in normal Hydra as well as in animals undergoing various conditions (budding, regenerating, eserinetreated, and sexual). They appear in all regions of the animal, but seem to be more prevalent at or near the extremities: hypostome, tentacles and basal disk. They are found in all of the seven basic cell types: interstitial, cnidocyte, nerve, epithelio-muscular, gland, mucous and digestive cells. The chemical nature of the intramitochondrial crystals is unknown and their significance remains speculative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220241
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  • 8
    Electronic Resource
    Electronic Resource
    Cellular mechanisms of stimulation of bud production in Hydra by low levels of inorganic lead compounds (1977)
    Springer
    Cell & tissue research 177 (1977), S. 555-570 
    Details
    ISSN: 1432-0878
    Keywords: Hydra ; Budding ; Differentiation ; Nerve cells ; Lead
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Treatment of Hydra with subtoxic levels of inorganic lead compounds (lead nitrate and lead chloride) for periods ranging from 5 min to one hour causes a temporary increase in bud production as compared to untreated control animals. This effect can be inhibited by the addition of large amounts of calcium chloride to the culture medium. The increased rate of budding is preceded by a dramatic increase in the number of nerve cells per animal, which is first observed within six hours after lead treatment. This appears to be the result of an increased rate of mitosis in the undifferentiated interstitial cells and their subsequent differentiation into nerve cells. The total number of cells per animal also increases after exposure to lead compounds, suggesting that lead may act as a general mitotic stimulator of all dividing cell types in Hydra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220614
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  • 9
    Electronic Resource
    Electronic Resource
    The effect of density on the gastric emptying of single- and multiple-unit dosage forms (1986)
    Springer
    Pharmaceutical research 3 (1986), S. 208-213 
    Details
    ISSN: 1573-904X
    Keywords: gastrointestinal transit ; pellet density ; floating formulations, gastric emptying
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The gastric emptying of pellets and single units of different densities has been followed in healthy subjects using the technique of gamma scintigraphy. The gastric emptying of the light pellets was affected by their buoyancy in the upper part of the stomach. However, the mean gastric emptying rates of pellets and single units were not significantly affected by density. Floating or buoyant delivery systems may have little advantage over conventional systems. The presence of food in the stomach was found to be the major factor in determining the gastric emptying of single units.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1016334629169
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  • 10
    Electronic Resource
    Electronic Resource
    Filbertworm sex pheromone (1984)
    Springer
    Journal of chemical ecology 10 (1984), S. 53-61 
    Details
    ISSN: 1573-1561
    Keywords: Melissopus latiferreanus ; Lepidoptera ; Tortricidae ; Olethreutinae ; filbertworm ; sex pheromone ; sex attractant ; (E,E)-8 ; 10-dodecadien-1-ol acetate ; (E,Z)-8,10-dodecadien-1-ol acetate ; conjugated diene isomerization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract (E,E)- and (E,Z)-8,10-Dodecadien-1-ol acetates were identified in a 1∶4.3 ratio in the extract of abdominal tips of female filbert-worm moths,Melissopus latiferreanus (Walsingham). The identifications were based on electroantennogram (EAG) analysis, gas chromatography, mass spectrometry, ozonolysis, and synthesis. TheE,Z isomer produced the stronger EAG response. In the field tests of various ratios ofE,E∶E,Z, the ratio found in the extract captured the most males. The pureE,E isomer initially was not attractive by itself (〈0.1%E,Z) but became attractive after a few days, presumably because of isomerization. TheE, Z isomer (〈0.1%E,E) was attractive initially, but this compound might have isomerized faster than theE,E isomer. A study of the isomerization showed that regardless of the initial mixture of 8,10-dodecadien-1-ol acetate isomers, almost complete equilibration existed after one month. The equilibrium mixture consisted of 9%Z8,E10, 65%E8,E10, 23%E8,Z10, and 3%Z8,Z10. Concentrations in rubber septa (1∶4 ratio ofE,E toE,Z) of 0.03–3.0 mg/septum produced equivalent trap catches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987643
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