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  • Planaria  (3)
  • 81.20.Lb  (2)
  • Springer  (5)
  • Cell Press
  • 1
    Electronic Resource
    Electronic Resource
    Effects of particle packing on the sintered microstructure (1988)
    Springer
    Applied physics 45 (1988), S. 271-275 
    Details
    ISSN: 1432-0630
    Keywords: 81.20.Ev ; 81.20.Lb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The sintering process is shown to be critically dependent on particle-packing density and porosity uniformity. Sintering experiments were conducted on compacts consisting of monodisperse, spherical TiO2 particles. Densification kinetics and microstructure evolution for two initial packing densities, 55% and 69% of theoretical, were investigated. The lower-density compacts sintered rapidly to theoretical density, yet improved particle-packing density and uniformity significantly enhanced densification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617931
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  • 2
    Electronic Resource
    Electronic Resource
    Cell autolysis and deletion in the planarian polycelis tenuis Iijima (1974)
    Springer
    Cell & tissue research 154 (1974), S. 265-274 
    Details
    ISSN: 1432-0878
    Keywords: Cell autolysis ; Deletion ; Planaria ; Acid phosphatase ; Fine structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Selective cell autolysis and deletion is described in the normal adult planarian. This appears to be a common feature and the sequence of events leading from cytoplasmic vesiculation and peripheral lysis to complete cellular breakdown is described. — In lysing cells acid phosphatase activity can be demonstrated in the cytoplasm as well as in lysosome like vacuoles and occasionally in the Golgi apparatus. The role of cell autolysis and deletion in tissue regulation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223168
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  • 3
    Electronic Resource
    Electronic Resource
    The effects of starvation on the planarian worm Polycelis tenuis iijima (1976)
    Springer
    Cell & tissue research 169 (1976), S. 193-209 
    Details
    ISSN: 1432-0878
    Keywords: Planaria ; Starvation ; Fine structure ; Biochemistry ; Cytochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Employing a combination of microscopical, biochemical and autoradiographic techniques, the primary effects of starvation on adult Polycelis tenuis have been studied. Over a five week period of starvation there is on average a 32% decrease in the size of the organism. This decrease is contributed to by a reduction in mitosis and an increase in cell shrinkage autolysis and death. During starvation (following a sharp rise in RNA synthesis) there is a distinct sequence of events; four peaks of acid phosphatase activity can be resolved. The first is associated with the immediate response of the gastrodermis to feeding; the second (after 6 to 7 days) with increased autophagy and dedifferentiation in the gland cells and with muscle lysis; the third peak (after 14 to 15 days) is contributed to largely by the lysis of cells in the gut and the fourth peak (after 25 to 26 days) is caused by an extensive lysis of the reproductive system. Fine structural changes involving increased intracellular vacuolation, autophagy, crinophagy, atrophy of muscle, increased intercellular space and loss of basement membrane matrix have been related to changes in enzyme pattern. Nerve cells appear unchanged throughout the first five weeks of starvation. Pigment and gland cells loose their characteristic granules, dedifferentiate and become morphologically similar to the undifferentiated neoblasts. Dedifferentiation and the mechanisms involved in the survival of starvation are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00214208
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  • 4
    Electronic Resource
    Electronic Resource
    The distribution of oxidizable mucosubstances and polysaccharides in the planarian Polycelis tenuis iijima (1975)
    Springer
    Cell & tissue research 161 (1975), S. 263-275 
    Details
    ISSN: 1432-0878
    Keywords: Oxidizable mucosubstances ; Fine structure ; Planaria ; X-ray microanalysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A chromic acid oxidation-silver technique was used to localize polysaccharide material in Polycelis tenuis at the electron microscope level. In the epithelium, staining was observed within apical vacuoles and on the free surfaces of the cells. A similar staining was observed in relation to the glycocalyx of the pharyngeal epithelia and that of the flame cells. Silver was deposited in the basement membrane. In the parenchyma, the major components giving a positive reaction were the cyanophil and mucous gland cells. Particularly strong silver staining (confirmed by X-ray microanalysis) was observed in the granules and Golgi apparatus of the cyanophil cells. IDPase activity was also found in relation to the Golgi apparatus and its secretory products. The overall distribution of mucopolysaccharide material was confirmed with the PAS and Alcian blue techniques. The fine structural localization of the Alcian blue was also determined using electron microscopy and X-ray microanalysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220373
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  • 5
    Electronic Resource
    Electronic Resource
    An investigation of catalytic activity in mixed metal oxide nanophase materials (1993)
    Springer
    The European physical journal 26 (1993), S. 46-50 
    Details
    ISSN: 1434-6079
    Keywords: 82.65.Jv ; 81.20.Lb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present preliminary evidence for catalytic activity by unsupported mixed metal oxide nanocrystalline materials. The results of this study show that a nanophase form of Li-MgO has begun to exhibit catalytic activity by 300 °C. This is at least 200 degrees below the temperature at which conventional Li-MgO catalysts exhibit comparable activity. Furthermore, at higher temperatures, the same nanophase composition shows enhanced activities and somewhat improved hydrocarbon selectivities over conventional Li-MgO catalysts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429104
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