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1988 (1)
1979 (1)
1Author    Rudolf WinklbauerRequires cookie*
 Title    Growth Control and Pattern Regulation in the Lateral Line Systems of Xenopus  
 Abstract    In Xenopus, the supraorbital lateral line system consists of a periodic pattern of lateral line organs which is formed by the regular fragmentation of a streak-like primordium. The pattern forming mechanism which subdivides the primordium into individual organs is not capable of adjusting to the variable size of the system. Nevertheless, the number of organs per supraorbital system tends to be held constant. This is achieved by regulating the growth of the system in an appropriate manner. 
  Reference    Z. Naturforsch. 43c, 294—300 (1988); received December 22 1987 
  Published    1988 
  Keywords    Growth Control, Pattern Formation, Lateral Line System Xenopus 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0294.pdf 
 Identifier    ZNC-1988-43c-0294 
 Volume    43 
2Author    Jürgen Van Der Bosch, Ilse Sommer, Heinz Maier, Willy RahmigRequires cookie*
 Title    Density-Dependent Growth Adaptation Kinetics in 3T 3 Cell Populations Following Sudden [Ca2+] and Temperature Changes. A Comparison with SV40-3T3 Cells  
 Abstract    Lowered extracellular [Ca2+ ] causes low growth rates and low stationary cell densities in 3T3 cell cultures as compared to physiological [Ca2+ ]. Under otherwise constant conditions the extra­ cellular [Ca2+ ] determines a stable stationary cell density, which can be readied by increase of net cell number or decrease of net cell number, depending on cell density at the time of [Ca2+ ] adjustment. SV40-3T3 cells do not show this [Ca2+] dependency. At 39 °C 3T3 and SV40-3T3 cell populations show an increased growth rate at low cell densities as compared to cell popula­ tions at 35 °C. Approaching the stationary density the growth rate of both cell sorts is reduced faster at 39 °C than at 35 °C, leading to lower stationary cell densities at 39 °C than at 35 °C. A temperature change from 39 °C to 35 °C or in the opposite direction can affect the stationary cell density of 3T3 cell populations only if applied before reduction of growth rate by density-dependent growth-inhibiting principles has taken place. 
  Reference    Z. Naturforsch. 34c, 279 (1979); received December 19 1978 
  Published    1979 
  Keywords    Ca2+, Temperature, Growth Control, 3T3 Cell, SV40-3T3 Cell 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0279.pdf 
 Identifier    ZNC-1979-34c-0279 
 Volume    34