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  • 1990-1994
  • 1980-1984  (5)
  • 1915-1919
  • 1980  (5)
  • 1
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 339 (1980), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 349 (1980), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 45 (1980), S. 390-395 
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Seasonal changes in the Crassulacean Acid Metabolism (CAM) activity and growth characteristics of Opuntia humifusa Raf. were examined under midwest climatic conditions. Twenty-four hour studies were done at monthly intervals for two years, with diurnal changes in transpiration, gas exchange, and titratable acidity monitored under natural conditions. CAM activity was observed only from April to September, but occurred regardless of changes in temperature or precipitation. The maximum rate of dark CO2 uptake occurred in May, while greatest acid fluctuations coincided with flowering, new growth, and high tissue water content in June. In spite of conditions favorable for CAM, acidification and rate of dark CO2 assimilation decreased progressively through September as stem water content dropped and shoot production ceased. No CAM was evident during sub-zero winter months and tissue water content decreased to only 65% (Ψ〈-20 bars). Winter survival of plants in test plots was found to be affected by the amount of water received the preceding growing season; the driest group showing the lowest mortality rate. Although spring and autumn were considered periods likely to exhibit CAM, it was not observed during those months just prior to or immediately following winter (Oct. and March). Acid fluctuations were minimal with CO2 being taken up during the day and released at night, indicating some degree of flexibility in the CAM activity of Opuntia humifusa.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 58 (1980), S. 1037-1042 
    ISSN: 1432-1440
    Keywords: Uremic autonomic neuropathy ; Baroreflex ; Efferent sympathetic limb ; Circulatory regulation ; Urämische autonome Neuropathie ; Baroreflex ; Sympathicus ; Kreislaufregulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die urämische autonome Neuropathie führt zu Störungen der Funktion des Baroreflexes. Aus der Literatur geht hervor, daß die wesentlichen Defekte den afferenten Reflexbogen sowie den efferenten cardialen Vagus betreffen, während die sympathische Funktion des efferenten Schenkels intakt bleibt. Eigene Befunde, an chronischen Hämodialysepatienten während Orthostase und Volumenentzug erhoben, belegen ebenfalls eine qualitativ und quantitativ adäquate Antwort des efferenten Sympathicus sowie eine erhaltene Ansprechbarkeit der Rezeptoren des Endorgans. Die autonome Neuropathie disponiert zur symptomatischen Hypotension bei Volumenentzug während der Dialysebehandlung. Zusätzlich führt die Hämodialysebehandlung selbst zu einer noch ungeklärten Hemmung der sympathischen Reaktion auf Volumenentzug. Die autonome Neuropathie disponiert bei Volumenbelastung zur arteriellen Hypertonie.
    Notes: Summary Uremic autonomic neuropathy leads to impaired function of the baroreflex. The main defect, according to literature, is located in the afferent limb of the reflex arc and in the efferent cardiac vagus nerve, whereas the sympathetic part of the efferent arc is still intact. Own results, obtained in hemodialysis patients during orthostasis and volume removal induced sympathetic stimulation, showed a qualitatively and quantitatively adequate sympathetic response and also an adequate end organ receptor response. Autonomic nervous neuropathy predisposes to volume removal related symptomatic hypotension during hemodialysis treatment. In addition hemodialysis treatment per se induces a so far unexplained interference with sympathetic response to volume removal. The autonomic neuropathy also predisposes to development of hypertension in response to volume load.
    Type of Medium: Electronic Resource
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