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  • Electronic Resource  (3)
  • 1975-1979  (3)
  • Commelina  (1)
  • Hypoxia  (1)
  • Calcareous soil
  • Physics
  • 1
    Electronic Resource
    Electronic Resource
    Carbon dioxide sensitivity of the central chemosensitive mechanisms (1977)
    Springer
    Pflügers Archiv 367 (1977), S. 241-247 
    Details
    ISSN: 1432-2013
    Keywords: Central chemosensitive mechanisms ; Pulmonary ventilation ; CO2 sensitivity ; Hypoxia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In urethane-anaesthetised adult albino rats ventral surface of the brainstem was stimulated chemically by increasing the local CO2 concentration and electrically. Two areas were demarcated on the ventral surface of the brainstem, one which showed an increase in pulmonary ventilation on chemical and electrical stimulation, and another which showed a decrease in pulmonary ventilation and sometimes even respiratory arrest. EEG activity recorded from the area from where increased pulmonary ventilation was obtained showed a synchronous slow wave activity during chemical stimulation and inhalation of a CO2-air mixture. This area is situated 0.5–1 mm lateral to the mid-line extending up to the rootlets of the VIIth to IXth cranial nerves. The response increased proportionately on increasing the strength of the chemical stimulus, till it reached a plateau. In carotid body denervated and chronic hypoxic animals, the magnitude of the responses was shown to be increased, probably due to increased sensitivity of the central chemosensitive mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00581361
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Abscisic acid levels and metabolism in the leaf epidermal tissue of Tulipa gesneriana L. and Commelina communis L. (1979)
    Springer
    Planta 146 (1979), S. 135-138 
    Details
    ISSN: 1432-2048
    Keywords: Abscisic acid ; Commelina ; Leaf epidermal tissue ; Radioimmunoassay (ABA) ; Tulipa ; Water stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have shown the presence of abscisic acid (ABA) in abaxial epidermal strips taken from Tulipa gesneriana and Commelina communis and that the ABA level rises in the epidermis when leaves are water stressed. ABA levels had risen 50% in the abaxial epidermis of C. communis 30 min after the leaves lost 10% of their fresh weight. Epidermis from both T. gesneriana and C. communis metabolize [14C]ABA to several products probably including phaseic acid (PA) and dihydrophaseic acid (DPA).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388223
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Redox polymerization of acrylonitrile. Kinetics of the reaction initiated by the redox system tartaric acid-V5+ (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 13 (1975), S. 2075-2086 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Kinetics of vinyl polymerization of acrylonitrile initiated by the redox system tartaric acid-V5+ have been investigated in aqueous sulfuric acid in the temperature range 30-40°C. The rates of polymerization and V5+ disappearance and the chain lengths of polyacrylonitrile were measured. From the results it is concluded that the polymerization reaction is initiated by an organic free radical arising from the V5+-tartaric acid reaction with termination by V5+ ions. A suitable kinetic scheme has been proposed, and the various rate and energy parameters were evaluated.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.170130912
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    Paper (German National Licenses)
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