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  • Signal transduction  (2)
  • phosphate  (2)
  • Columnar defects  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Ising model for cooperative processing of extracellular information by protein-tyrosine kinases and cell adhesion molecules
    Amsterdam : Elsevier
    Biosystems 33 (1994), S. 89-98 
    Details
    ISSN: 0303-2647
    Schlagwort(e): Extracellular matrix ; Ising model ; Monte Carlo simulation ; Receptor tyrosine kinases ; Signal transduction ; Tumor associated antigens (CEA) ; growth factors
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1016/0303-2647(94)90049-3
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Structured biological modelling: a method for the analysis and simulation of biological systems applied to oscillatory intracellular calcium waves
    Amsterdam : Elsevier
    Biosystems 27 (1992), S. 145-169 
    Details
    ISSN: 0303-2647
    Schlagwort(e): Oscillatory calcium waves ; Signal transduction ; Stochastic simulation ; Structured Biological Modelling ; Systems analysis
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1016/0303-2647(92)90070-F
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Reassessment of root competition for P of field-grown maize in pure and mixed cropping (1988)
    Springer
    Plant and soil 106 (1988), S. 299-301 
    Details
    ISSN: 1573-5036
    Schlagwort(e): lupin ; maize ; phosphate ; root competition
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract Root competition for phosphate (P) in the field was calculated with maize i) as singly grown plants, ii) in pure cropping and iii) in mixed cropping with lupin. The experimentally determined parameters used for this purpose were thein situ root-distance pattern as registered by autoradiography and the P-depletion cylinder around a maize root as determined autoradiographically under radial diffusional flow. The results do not indicate any competition for P between roots of adjacently grown plants in either pure or mixed cropping. On the other hand, the P-depletion cylinders of approximately one third of the roots of an individual maize plant were found to overlap. However, when allowance was made for the concentration gradients within a depletion cylinder, the actual competition for phosphate was less than 1%.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02371230
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Development and replenishment of the P-depletion zone around the primary root of maize during the vegetation period (1987)
    Springer
    Plant and soil 101 (1987), S. 247-255 
    Details
    ISSN: 1573-5036
    Schlagwort(e): freeze-cutting ; dynamics ; depletion zone ; root longevity ; maize ; P-deficiency ; phosphate ; radioautography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract The dynamics of the development and replenishment of P-depletion zones around the primary root of maize (Zea mays L. cv ‘Garbo’) was studied during a vegetation period (80 days) under greenhouse conditions in a loamy sand of low P-availability. A recently described freeze-cutting technique was used to determine radial diffusion of labelled phosphate to the primary root. The development of the depletion zone was biphasic. In the initial phase after two days of growth of the primary root in a soil layer labelled with33P a minimum of isotopically exchangeable P (EP) was observed which had decreased to about 30% of its original amount at the root surface. At that time the corresponding P-concentration in the soil solution was calculated to be as low as 5×10−7 M. The depletion zone had already spread 0.4 mm from the root surface. During the second phase, between the 10th and 20th day of plant growth the concentration of EP at the root surface increased slowly but did not change markedly. However, the depletion zone continued to spread and after the 20th day of growth reached its maximal diameter (1.07 mm from the root surface) but remained completely within the root hair cyclinder; the single root hairs never exceeded 1.14 mm in length. The biphasic growth of the depletion zone was probably caused by proton extrusion of the root tip. Acidification of the soil solution from pH 5.8 to about 3.9 results in an about 3-fold rise of the concentration of desorbed phosphate and might also have activated acidophilic P-translocators of the root during the initial phase. Anion over cation uptake normally prevailing during the later stage of root development might resulted in a rise of the soil pH within the root hair zone. Consequently P-availability, as well as P-uptake capacity declined, but P-uptake by the seminal root still continued until the 20th day. Subsequently, the P-concentration within the depletion zone increased again while simultaneously its extent was reduced until it was almost completely replenished after 60 days indicating a loss of P-uptake capacity of the primary root. Within the root tissue33P was accumulated to about twice the concentration of that in the undepleted soils. This accumulation corresponded to periods of high uptake due to the development of root laterals. In the root cortex a high P-content was observed during the first 30 days of growth. At the onset of the reproductive stage of the plant the P-content of the shoot and especially in the developing seeds rose considerably at the cost of phosphate stored in the root cortex. The accumulation of33P in the root tissue indicated that nutrient gain was mainly achieved during the early stages of plant development and that P was temporarily stored to some extent within the root system.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02370652
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    The influence of columnar defects on the critical current density in (Bi, Pb)2Sr2Ca2Cu3O10 + δAg tapes (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 783-786 
    Details
    ISSN: 1572-9605
    Schlagwort(e): Columnar defects ; critical current density ; tapes ; 2223 BPSCCO ; pinning energy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract An excellent tool to enhance the critical current density in superconductors is the controlled introduction of defects by irradiation damage. Irradiation with 2.65 GeV Au ions provides the generation of amorphous line defects. Polycrystalline (Bi, Pb)2Sr2Ca2Cu3O10 + δ Ag tapes processed by the powder-in-tube technique were irradiated up to doses of 3.5× 1011 Au ions/cm2 at a temperature of 100 K. On the one hand, our irradiation experiments were performed to investigate the degree ofj c enhancement and, on the other hand, to examine the flux pinning mechanism in (Bi, Pb)2Sr2Ca2Cu3O10 + δ tapes. Characterization of the samples was performed by magnetization measurements using a vibrating sample magnetometer (VSM) up to 13 T in a temperature range between 5 and 100 K. Further, we have measured the relaxation of the magnetic moment before and after irradiation to determine the influence of columnar defects on the activation energyU. A comparison of the irradiation-induced effects with previous results obtained on Bi2Sr2CaCu2O8 + δ irradiation experiments is included.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01320869
    Standort Signatur Erwartet Verfügbarkeit
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