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  • AEROSPACE MEDICINE  (2)
  • Inorganic Chemistry  (1)
  • Oscillators  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Dynamics of coupled stomatal oscillators (1982)
    Springer
    Journal of mathematical biology 15 (1982), S. 131-149 
    Details
    ISSN: 1432-1416
    Keywords: Stomate ; Oscillators ; Dynamical systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Stomata are microscopic openings in the leaves of green plants which permit gas exchange. Stomata exhibit oscillatory opening and closing behavior under certain environmental conditions in addition to a daily (diurnal) cycle. In order to explore the effects of coupling between neighboring stomata we present a mathematical model of the dynamics of a system of N coupled stomatal oscillators. An individual stomate is modeled to either remain closed, oscillate periodically, or remain open, depending on the local water potential. Coupling between neighboring stomata is accomplished in the model by taking into account the flow of water in the leaf as well as by oscillator phase coupling. Analysis of the model shows that under certain conditions it exhibits a stable spatially uniform synchronized behavior, referred to here as the in-phase mode. It is also shown that under non-uniform illumination the system may behave in a more complicated fashion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275070
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Bemerkung über das Atomgewicht des Antimons (1879)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 12 (1879), S. 2123-2124 
    Details
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.187901202237
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  • 3
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    Prevention of decompression sickness during a simulated space docking mission (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: This study has shown that repetitive exchanges between the Apollo space vehicle atmosphere of 100% oxygen at 5 psia (258 torr) and the Soyuz spacecraft atmosphere of 30% oxygen-70% nitrogen at 10 psia (533 torr), as simulated in altitude chambers, will not likely result in any form of decompression sickness. This conclusion is based upon the absence of any form of bends in seven crewmen who participated in 11 tests distributed over three 24-h periods. During each period, three transfers from the 5 to the 10 psia environments were performed by simulating passage through a docking module which served as an airlock where astronauts and cosmonauts first adapted to each other's cabin gases and pressures before transfer. Biochemical tests, subjective fatigue scores, and the complete absence of any form of pain were also indicative that decompression sickness should not be expected if this spacecraft transfer schedule is followed.
    Keywords: AEROSPACE MEDICINE
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    NASA TECHNICAL REPORTS
  • 4
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    Denitrogenation interruptions with air (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A 3-h denitrogenation period at ground-level pressure with 95% O2-5% N2, with an air interruption of 5 min or more and matched with additional denitrogenation time equal to the interruption, will later result occasionally in altitude decompression sickness ('bends') during a 2-h decompression exposure at 3.8 psia (10,058 m equivalent) with 92% O2- 8% N2. Thus the equal time or 'mirror-image' make-up time for loss of denitrogenation did not prevent bends 7 times in 17 subjects during 71 exposures with air interruptions; on the other hand, no case of bends was reported after uninterrupted denitrogenation periods. Nitrogen-loading during the interruptive period is believed to resupply the bends sites with additional nitrogen, which re-establishes conditions favoring a return to a high incidence of bends.
    Keywords: AEROSPACE MEDICINE
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    NASA TECHNICAL REPORTS
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