D. Ammermann

Publications60
h-index17
Citations974
Highly Influential Citations43
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The development of the macronucleus in the ciliated protozoan Stylonychia mytilus
Ciliated protozoa are characterized by generative micronuclei and vegetative polyploid macronuclei. Micronuclei of Stylonychia mytilus contain 1 600 times as much DNA per haploid genome as E. coli.… Expand
  • 122
  • 9
Phylogenetic relationships within the class Spirotrichea (Ciliophora) inferred from small subunit rRNA gene sequences.
The small subunit rDNAs of five species belonging to the Euplotidae and eight species of the Oxytrichidae were sequenced to obtain a more detailed picture of the phylogenetic relationships within the… Expand
  • 69
  • 9
Methylated bases in the DNA of the ciliate Stylonychia mytilus.
  • 36
  • 5
Morphology and development of the macronuclei of the ciliates Stylonychia mytilus and Euplotes aediculatus
Some stages of macronuclear anlagen development, known from earlier investigations (see Fig. 1), were studied in detail. The results are: a) The giant chromosomes of Stylonychia mytilus are not… Expand
  • 54
  • 4
On the structure of oxyblepharismin and its formation from blepharismin
Abstract The blepharismins ( 1 ) from Blepharisma japonicum give the corresponding oxyblepharismins ( 2 ) on irradiation in vitro and in vivo . The chemical structures of these compounds are… Expand
  • 36
  • 2
Minichromosomal DNA replication in the macronucleus of the hypotrichous ciliate Stylonychia lemnae is independent of chromosome-internal sequences
Abstract. The origins of DNA replication in prokaryotes and eukaryotes are typically defined by cis-acting sequences. However, in ciliates, evidence suggests that the replication of short… Expand
  • 19
  • 2
Giant chromosomes in ciliates.
  • D. Ammermann
  • Biology, Medicine
  • Results and problems in cell differentiation
  • 1987
Ciliates are characterized by the occurrence of two different cell nuclei. The DNA-rich macronucleus is the “somatic nucleus” of the cell and is responsible for almost the entire cellular RNA… Expand
  • 16
  • 2
Modeling senescence in hypotrichous ciliates.
A sexually reproducing hypotrichous ciliates undergo senescence which is in general attributed to degenerative processes in the macronucleus, assuming that loss of viability is based on loss of… Expand
  • 13
  • 2
The micronucleus of the ciliate Stylonychia mytilus; its nucleic acid synthesis and its function.
  • D. Ammermann
  • Biology, Medicine
  • Experimental cell research
  • 1 July 1970
Abstract The micronuclei of Stylonychia mytilus have a G1 phase of 8–9 h and an S phase of 2 h. No G2 was observed, and micronuclear mitosis starts before macronuclear DNA synthesis has ended.… Expand
  • 51
  • 1
Characterization of two sibling species of the genus Stylonychia (Ciliata, Hypotricha): S. mytilus Ehrenberg, 1838 and S. lemnae n.sp. I: Morphology and reproductive behavior
All Stylonychia mytilus-like ciliates which were collected and sent to us during the last 20 years belonged either to S. mytilus or to a new species, S. lemnae, which is described here. The only… Expand
  • 43
  • 1