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1981 (1)
1980 (1)
1Author    Eberhard Hohaus, Wolfgang Riepe, Klaus Wessendorf, LaRequires cookie*
 Title    Massenspektrometrische Untersuchungen an Borchelaten, V [1] Fragmentierung borhaltiger aromatischer Azoverbindungen Mass Spectrometric Investigation of Boron Chelates, V [1] Fragmentation of Aromatic Azo Compounds Containing Boron M+ M+-R M+-RH A M+-C6H5N2 C6H5N2+ C6H5 +  
 Abstract    Differing fragmentation of boron chelates of aromatic azo compounds confirms the structural formulae la-7c, presented in [2]. More significant differences are caused by the substituent of the boron R (F instead of C6H5). Although certain rules can be deduced by the substitution of F for CeHs with regard to the change in intensity of the ions M+, M+-R (and others), in some cases the stable aromatic azo system causes a significant change in the fragmentation as compared with that of azomethine chelates. The chelates 7 eliminate "RH" and show no molecular ion. Apparently a second chelate ring is closed before further fragmentation can start. Fragmentation of 7 a and b is analogous to 5. Einführung Die Massenspektrometrie nimmt bei der analyti-schen Überprüfung und der Konstitutionsaufklä-rung von Borchelaten eine besondere Stellung ein, weil umfangreiches Material mit verschiedensten Komplexbildnern vorliegt. Deshalb werden die Er-gebnisse der Azochelate [2] mit denen der früher dargestellten verglichen. Die Numerierung der Che-late erfolgt nach dem Formelschema in [2]. Vergleich der Fragmentierungen Chelate 1 und 2: Das Massenspektrum von la zeigt nur eine geringe relative Intensität für das Tab. I. Nr. 
  Reference    Z. Naturforsch. 35b, 316—318 (1980); eingegangen am 8. Oktober 1979 
  Published    1980 
  Keywords    Mass Spectrometry, Boron Azo Chelates, Fragmentation 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0316.pdf 
 Identifier    ZNB-1980-35b-0316 
 Volume    35 
2Author    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