Anna Maria Pirrone

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This paper reports on a successful application of fluorescent in situhybridization (FISH) with three repetitive DNA probes (ribosomal DNA (rDNA), (GATA)nand (TTAGGG)n) in the chromosomes of Fasciolaria lignaria(Mollusca: Prosobranchia: Neogastropoda). rDNA FISH consistently identified four chromosome pairs per spread in the three examined specimens. The(More)
A cytogenetical study was carried out on the chromosomes and nuclear DNA amounts of the terrestrial earthworms Octodrilus complanatus and Eisenia foetida (Annelida: Oligochaeta: Lumbricidae). Chromosomes were studied using Giemsa staining, banding methods and fluorescent in situ hybridization (FISH) with two repetitive DNA probes [rDNA and (TTAGGG)n]. rDNA(More)
Regeneration of mammalian digit tips is well described; however, associated cellular or molecular events have not been studied in humans. We describe an in vitro human fetal model of response to digit tip amputation, and report expression of the transcription repressor Msx1 in the developing and regrowing human digit tip. Human fetal digits from specimens(More)
Spermatogonial and metaphase I chromosomes of the lumbricid earthworm Octodrilus complanatus (Annelida: Oligochaeta) were examined using fluorescent in situ hybridization (FISH) with three repetitive DNA probes-5S rDNA, 18S-26S rDNA, and (TTAGGG)(n). Single-color FISH consistently mapped one chromosome pair per spread using either 5S rDNA or 18S-26S rDNA as(More)
Treatment of embryos of Paracentrotus lividus with a concentration of ZnSO4 which causes animalization, strongly inhibits the initiation of ribosomal RNA synthesis. The vegetalizing agent LiCl does not seem clearly to affect the synthesis of this RNA. In mit ZnSO4 animalisierten Embryonen von Paracentrotus lividus ist der Beginn der ribosomalen RNS-Synthese(More)
The production of heat-shock proteins in sea urchin embryos is accompanied by the appearance at the polysomal level of their relative mRNAs, as shown by their translation in a cell-free system; thus suggesting that the regulation of their production occurs at a transcriptional level. The mechanism for the inhibition of the bulk protein synthesis and for its(More)