Experientia

, Volume 33, Issue 10, pp 1314–1316 | Cite as

Chromatin ultrastructure of lower vertebrates

  • Maria Luiza Beçak
  • K. Fukuda
  • Sylvia Mendes Carneiro
Biologica

Summary

Meiotic and mitotic chromosomes from amphibians and snakes were studied by electron microscopy. By using water spreading, preceded by a mild NaCl pretreatment, we showed: 1. ‘Beads on a string’ arrangement of the chromatin fibres; 2. The presence of loops at pachytene chromomeres as well as during metaphase of both mitosis and first meiosis; 3. Transcriptional activity for non-ribosomal RNA on peripheral loops during the middle pachytene.

Keywords

Microscopy Electron Microscopy Transcriptional Activity Mitotic Chromosome Lower Vertebrate 

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Copyright information

© Birkhäuser Verlag 1977

Authors and Affiliations

  • Maria Luiza Beçak
    • 1
  • K. Fukuda
    • 1
  • Sylvia Mendes Carneiro
    • 1
  1. 1.Serviço de GenéticaInstituto ButantanSão Paulo(Brazil)

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