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  • 1995-1999  (2)
  • 1905-1909
  • Column liquid chromatography  (1)
  • Home-navigation  (1)
  • 1
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Aldehydes, aliphatic ; 1,3-Cyclohexanedione (CHD) ; Fluorimetric detection ; Plasma analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A simple and sensitive method is proposed for the measurement of aldehydes in plasma. The plasma samples are treated with 1,3-cyclohexanedione (CHD) and after addition of the internal standard (the CHD derivative of octaldehyde) are analysed by reversed-phase high-performance liquid chromatography with an acetonitrile-water gradient as the mobile phase. Detection is by fluorimetry with excitation at 395 nm and emission at 457 nm. In plasma samples spiked with aldehydes, the calibration curves showed good linearity in the range 0–10 μg mL−1. The recoveries of aldehydes were quantitative; coefficients of within-day and between-day variation were less than 13% and 11%, respectively. Applications to human and some animal plasma samples are reported.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Artificial life and robotics 2 (1998), S. 129-133 
    ISSN: 1614-7456
    Keywords: Hippocampal neural network ; Hebbian learning ; Phase coding ; Self-orientation ; Home-navigation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract We propose an artificial neural network model for autonomous agents, i.e., mobile robots, to learn maps of environments and acquire the ability to perform home-navigation autonomously. The networks consists of two subnetworks, each of which has a similar structure with hippocampal lamellar neuronal circuits. Hebbian learning procedures self-organize the first subnetwork to output the distributed sinusoidal activity of the cells by accumulating motor information generated during movement, and the second subnetwork to output localized activity by prototyping sensory information. These patterns represent a homing vector providing the relative coordinates of the agent from a starting point, and a place code corresponding uniquely to a point of the environment. By attaching homing vectors to the sensor map, the homing vector is associated with the sensory stimuli. Then the agents can perform home-navigation autonomously by this association.
    Type of Medium: Electronic Resource
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