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  • sol-gel  (2)
  • Body length  (1)
  • 1995-1999  (3)
  • 1
    Electronic Resource
    Electronic Resource
    The effect of temperature on maturation threshold body-length in Daphnia magna (1996)
    Springer
    Oecologia 108 (1996), S. 627-630 
    Details
    ISSN: 1432-1939
    Keywords: Daphnia magna ; Temperature ; Food supply ; Maturation ; Threshold ; Body length
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Aquatic invertebrates are usually larger at maturity when water temperatures are lower. For the freshwater cladoceran Daphnia, it has been suggested that a threshold size must be attained to initiate maturation, which results two instars later in the deposition of eggs into the brood chamber. This threshold size is believed to temperature on maturation threshold body-length in Daphnia magna. Daphnids were raised from birth to maturity under three constant-temperature regimes (12°C, 16°C, 22°C), and two food-level conditions. Animals were measured daily, and a body-length based maturation threshold determined for each individual. We demonstrate that mean maturation threshold length is negatively correlated with ambient water temperature. Further, daphnids with a larger threshold length tended to be larger at maturity. A maturation threshold linked to body length suggests that reduced variation in size at maturity is adaptive, even at the cost of additional variation in instar number or age at maturity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329035
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Optical Chemical Sensors Based on Sol-Gel Materials: Recent Advances and Critical Issues (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 1053-1061 
    Details
    ISSN: 1573-4846
    Keywords: sol-gel ; optical chemical sensor ; waveguide sensor ; fibre optic sensor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The use of the sol-gel process to produce materials for optical chemical sensors and biosensors is attracting considerable interest. This interest derives mainly from the design flexibility of the sol-gel process and the ease of fabrication. In most applications the sol-gel material is used to provide a microporous support matrix in which analyte-sensitive species are entrapped and into which smaller analyte molecules may diffuse. Sensors based on entrapped organic and inorganic dyes, enzymes and other biomolecules have been reported. A range of sensor configurations has been employed, including monoliths, thin films, as well as more elaborate structures. In this paper a selection is presented of recent significant developments in optical chemical sensors which employ sol-gel-derived materials. These developments include the tailoring of sol-gel materials to optimise sensor response, advanced waveguide structures and novel probe-tip sensors. Those issues which remain critical to the eventual deployment of sol-gel sensors are examined. In particular, the problems of leaching, microstructural stability, diffusion-limited response time, and susceptibility to interferents are discussed and some solutions proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018338426081
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Optical chemical sensors based on sol-gel materials: Recent advances and critical issues (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 1053-1061 
    Details
    ISSN: 1573-4846
    Keywords: sol-gel ; optical chemical sensor ; waveguide sensor ; fibre optic sensor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The use of the sol-gel process to produce materials for optical chemical sensors and biosensors is attracting considerable interest. This interest derives mainly from the design flexibility of the sol-gel process and the ease of fabrication. In most applications the sol-gel material is used to provide a microporous support matrix in which analyte-sensitive species are entrapped and into which smaller analyte molecules may diffuse. Sensors based on entrapped organic and inorganic dyes, enzymes and other biomolecules have been reported. A range of sensor configurations has been employed, including monoliths, thin films, as well as more elaborate structures. In this paper a selection is presented of recent significant developments in optical chemical sensors which employ solgel-derived materials. These developments include the tailoring of sol-gel materials to optimise sensor response, advanced waveguide structures and novel probe-tip sensors. Those issues which remain critical to the eventual deployment of sol-gel sensors are examined. In particular, the problems of leaching, microstructural stability, diffusion-limited response time, and susceptibility to interferents are discussed and some solutions proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436983
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    Paper (German National Licenses)
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