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  • 1
    Electronic Resource
    Electronic Resource
    Dynamic changes in the organization of microfilaments associated with the photocontrolled motility of chloroplasts in epidermal cells ofVattisneria (1996)
    Springer
    Protoplasma 195 (1996), S. 18-24 
    Details
    ISSN: 1615-6102
    Keywords: Chloroplasts ; Epidermal cell ; Microfilament ; Orientation movement ; Phytochrome ; Vallisneria gigantea Graebner
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Using time-lapse video microscopy, we performed a semiquantitative investigation of the movement of chloroplasts on the cytoplasmic layer that faces the outer periclinal wall (P side) of epidermal cells of leaves of the aquatic angiospermVallisneria gigantea Graebner. Under continuous irradiation with red light (650 nm, 0.41 W/m2), the movement of chloroplasts on the P side was transiently accelerated within 5 min. The increased movement began to decrease at around 20 min and fell below the original level after 40 to 60 min of irradiation with red light. The acceleration and deceleration of movement of chloroplasts on the P side seemed to lead directly to the increase and the subsequent decrease in the rate of migration of chloroplasts from the P side to the anticlinal layers of cytoplasm, which are responsible for the accumulation of chloroplasts on the P side, as we demonstrated previously. In the presence of inhibitors of photosynthesis, the accelerated movement of chloroplasts was maintained for as long as the chloroplasts were irradiated with red light. The rapid acceleration and deceleration of the movement of chloroplasts could be observed repeatedly with sequential irradiation with red and then far-red light (746 nm, 0.14 W/m2). Concomitantly with the loss of motility of chloroplasts on the P side, a dynamic change in the configuration of microfilaments, from a network to a honeycomb, occurred on the P side.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279183
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  • 2
    Electronic Resource
    Electronic Resource
    Monodisperse micron-sized crosslinked polystyrene particles. IV. Effect of network structure on polymerization procedure (1999)
    Springer
    Colloid & polymer science 277 (1999), S. 1205-1209 
    Details
    ISSN: 1435-1536
    Keywords: Key words Monodisperse micron-sized polystyrene particles ; Urethane acrylate ; Particle diameter ; Particle number density ; Polymerization rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Monodisperse micron-sized polystyrene particles crosslinked using urethane acrylate were produced by dispersion polymerization in ethanol solution and the effect of the crosslinked network structure on the polymerization procedure was studied. The influences of the concentrations of the initiator and urethane acrylate on the particle diameter (D n), the particle number density (N p), and the polymerization rate (R p) were found to obey the approximate relationships D n ∝ [initiator]0.43 [urethane acrylate]0.05, N p ∝ [initiator]−1.30 [urethane acrylate]0.19, and R p ∝ [initiator]0.24 ± 0.02. The power-law dependence of D n and N p on the initiator concentration showed a similar trend to that of linear polystyrene reported in the literature. Especially, it was found that urethane acrylate does not have a serious effect on D n and N p of the particles produced. The dependence of R p on the initiator concentration was observed to be higher than that of linear polystyrene, suggesting that there is still competition between heterogeneous polymerization and solution polymerization because of the crosslinked network structure of the primary particle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050511
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