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'Trichoplax' in keywords
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1990 (1)
1981 (1)
1Author    A. Ruthmann, K. G. Grell, G. BenwitzRequires cookie*
 Title    DNA Content and Fragmentation of the Egg Nucleus of Trichoplax adhaerens  
 Abstract    Under culture conditions the egg nucleus o f Trichoplax adhaerens reaches an unusually high and variable DNA content. Before the "fertilization membrane" is formed, the nucleus undergoes fragmentation. It is assumed that culture conditions differ from natural conditions by preventing the switch-over from the S-phase to the G 2-phase o f the cell cycle: DNA replication continues and nuclear division is impossible. Cleavage ceases at an earlier or later stage. 
  Reference    Z. Naturforsch. 36c, 564—567 (1981); received April 27 1981 
  Published    1981 
  Keywords    Trichoplax, Egg Nucleus, DNA Content, Fragmentation 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0564.pdf 
 Identifier    ZNC-1981-36c-0564 
 Volume    36 
2Author    F. E. Schulze, Heinz WenderothRequires cookie*
 Title    Cytoplasmic Vibrations Due to Flagellar Beating in Trichoplax adhaerens  
 Abstract    The dorsal epithelium of the plate-like primitive metazoon Trichoplax adhaerens is a sheet o f flat cells, each bearing a single flagellum. This layer rests largely on an intercellular fluid and is predominantly fixed at the edges o f the organism but also locally by fibre cells constituting the middle layer o f the animal. W ithin these extensile dorsal cells the counterforce o f the flagellar power stroke acting on the basal bodies subjects nearby objects to oscillatory motions. Given certain mechanical conditions, the vibrating single basal body can be compared with a springy oarlock that is rhythmically displaced with the power stroke and recoils during the recovery stroke. The basal body transmits its motion to the adjacent viscoelastic cytoplasm in which naturally coloured inclusion bodies serve as markers o f the pulsating deformation visible in the living anim al. These inclusions vibrate in the frequency range o f the flagellar beat and stop as soon as the flagella are paralyzed by chemical means. That the vibrations can only intermit­ tently be observed may be due to the varying tension of the dorsal epithelium exposed to the forces o f the contractile fibre cells. -The rhythmic cytoplasmic deformation synchronous with the flagellar action has apparently not yet been described in metazoa and could be docu­ mented by video recording. 
  Reference    Z. Naturforsch. 45c, 715—722 (1990); received February 6 1990 
  Published    1990 
  Keywords    Intracellular Particles, Flagella, Primitive Metazoan, Trichoplax 
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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-0715.pdf 
 Identifier    ZNC-1990-45c-0715 
 Volume    45