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  • 1
    Electronic Resource
    Electronic Resource
    Supply and compartmentalization of potassium in mesophyll cells of the needles of spruce, Picea abies (L.) Karst. (1989)
    Springer
    Trees 3 (1989), S. 154-160 
    Details
    ISSN: 1432-2285
    Keywords: Picea abies (L.) Karst. ; Potassium ; Nutrition ; Compartmentalization ; Cell morphometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The water and potassium content and the relative vacuolar volume (α = Vvacuole/Vcell) of mesophyll cells of the needles of healthy 21-yearold spruce trees [Picea abies (L.) Karst.] were determined. In 5-year-old needles α was 0.626 ± 0.178 (ovx ± SD). Potassium concentrations in the bulk tissue water ranged from about 65 to 105 mM. Simulations were made using this information and a simple two-compartmental model of the cell with the bulk cytoplasm and the vacuole and assuming that the minimum cytoplasmic and vacuolar K+ concentrations are 100–150 mM and 10–15 mM respectively. It is shown that a K+ content of needles below 50 mmol/1 tissue water would be precarious for maintenance of normal physiological and metabolic performance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226651
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Endogenous rhythms and chaos in crassulacean acid metabolism (1992)
    Springer
    Planta 188 (1992), S. 28-38 
    Details
    ISSN: 1432-2048
    Keywords: Beat oscillator ; Chaos ; Crassulacean acid metabolism ; Endogenous rhythm ; Kalanchoë (CO2 fixation, rhythm) ; Simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Endogenous free-running regular circadian oscillations of net CO2 exchange in the crassulacean-acidmetabolism (CAM) plantKalanchoë daigremontiana Hamet et Perrier de la Bâthie under constant external conditions in continuous light have been shown to change to irregular non-predictable (chaotic) time behaviour as irradiance or temperature are raised above a critical level. A model of CAM has been constructed with pools of major metabolites of varying concentrations, flows of metabolites leading to exchange between pools, metabolite transformations determined by chemical reactions, and feedback regulations. The model is described by a system of coupled non-linear differential equations. It shows stable rhythmicity in normal dark-light cycles and in continuous light and, like theK. daigremontiana leaves in the experiments, a change to chaos as irradiance is increased. The maintenance of endogenous oscillations in the model is brought about by a hysteresis switch or beat oscillator between two stable oscillation modes. In CAM these stable modes are vacuolar malate accumulation and remobilization. The model shows that the physical nature of the beat oscillator in the leaves can be explained by the balance between active and passive transport at the tonoplast.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160709
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Endogenous rhythms and chaos in crassulacean acid metabolism (1992)
    Springer
    Planta 188 (1992), S. 28-38 
    Details
    ISSN: 1432-2048
    Keywords: Beat oscillator ; Chaos ; Crassulacean acid metabolism ; Endogenous rhythm ; Kalanchoë (CO2 fixation, rhythm) ; Simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Endogenous free-running regular circadian oscillations of net CO2 exchange in the crassulacean-acidmetabolism (CAM) plant Kalanchoë daigremontiana Hamet et Perrier de la Bâthie under constant external conditions in continuous light have been shown to change to irregular non-predictable (chaotic) time behaviour as irradiance or temperature are raised above a critical level. A model of CAM has been constructed with pools of major metabolites of varying concentrations, flows of metabolites leading to exchange between pools, metabolite transformations determined by chemical reactions, and feedback regulations. The model is described by a system of coupled non-linear differential equations. It shows stable rhythmicity in normal dark-light cycles and in continuous light and, like the K. daigremontiana leaves in the experiments, a change to chaos as irradiance is increased. The maintenance of endogenous oscillations in the model is brought about by a hysteresis switch or beat oscillator between two stable oscillation modes. In CAM these stable modes are vacuolar malate accumulation and remobilization. The model shows that the physical nature of the beat oscillator in the leaves can be explained by the balance between active and passive transport at the tonoplast.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00198936
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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