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  • Anti-ageing  (1)
  • Buccal oscillations  (1)
  • Conflicting demands  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Respiration Physiology 26 (1976), S. 285-301 
    ISSN: 0034-5687
    Keywords: Breathing pattern ; Buccal oscillations ; Electromyography ; Mechanics of breathing ; Olfaction ; Rib movements ; Ventilation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1939
    Keywords: Suspension-feeding ; Boundary layers ; Drag ; Conflicting demands ; Larval black flies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We tested whether larval black flies actively control the positioning of their feeding appendages (labral fans), and if so, whether their posture represents a balance between the conflicting demands of drag and feeding. We compared the postures of live larvae with the postures of larvae killed by heat-shock in three different flow regimes in a laboratory experiment; we assumed that the postures of heat-killed larvae approximated a passive response to drag. The average height of the labral fans above the bed declined significantly in faster flows, and was significantly greater in live than dead larvae. There was also a significant interaction effect, since the difference between the fan heights of live and dead larvae was greater in slower flows. Two mechanisms may contribute to this result. Larvae in slower flows have to increase their fan heights more than larvae living in faster flows to achieve comparable increases in velocity and thus particle flux. In addition, muscular strength may limit the feeding postures larvae can assume. The fan heights of live larvae also varied depending on the concentration of food particles: larvae exposed to low food concentrations held their fans higher above the bed than did larvae exposed to high food concentrations in the same flow regime. This change in posture is due neither to an uneven particle concentration in the boundary layer nor to added drag from particles trapped in the labral fans. Collectively, our results indicate that these suspension feeders actively control their feeding posture, and suggest that these varying postures represent a dynamic balance between the conflicting needs of minimizing drag and maximizing feeding.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Plant growth regulation 32 (2000), S. 257-265 
    ISSN: 1573-5087
    Keywords: Anti-ageing ; Cytokinin ; Reactive oxygen species ; Hydroxyl radical. kinetin ; N6 – furfuryladenine ; Oxidative damage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In this paper we review the data on the structure and properties of N6-furfuryladenine (kinetin, K) accumulated during the last forty years. In 1955, kinetin was isolated from DNA as an artifactual rearrangement product of the autoclaving process. Subsequently, its cytokinin activity has been established, demonstrating a wide variety of biological effects, including those on gene expression, inhibition of auxin action, stimulation of calcium flux, the cell cycle, and as an anti-stress and anti-ageing compound. Recently, our views on this very well known plant hormone have changed. There are new data, which show that it occurs in cellular DNA as the product of oxidative, secondary modification and a secondary reaction of DNA. Also new results on the biological function of kinetin have been reported. Various biological effects produced by this hormone in vitro and in vivo have made kinetin even more scientifically interesting and commercially attractive as an ingredient of many beauty cosmetics.
    Type of Medium: Electronic Resource
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