Search results for " HOMO"
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Conservation of the positions of metazoan introns from sponges to humans
2002
Abstract Sponges (phylum Porifera) are the phylogenetic oldest Metazoa still extant. They can be considered as reference animals (Urmetazoa) for the understanding of the evolutionary processes resulting in the creation of Metazoa in general and also for the metazoan gene organization in particular. In the marine sponge Suberites domuncula , genes encoding p38 and JNK kinases contain nine and twelve introns, respectively. Eight introns in both genes share the same positions and the identical phases. One p38 intron slipped for six bases and the JNK gene has three more introns. However, the sequences of the introns are not conserved and the introns in JNK gene are generally much longer. Intron…
Regulation of motility of cells from marine sponges by calcium ions
1996
Sponges are known not to contain muscle and nerve cells. Since sponge cells are characterized by high motility we determined the effect of intracellular calcium ion concentration ([Ca2+]i) on their motility. Addition of the Ca2+ ionophore ionomycin to dissociated cells from the marine sponge Suberites domuncula caused in Ca(2+)-containing artificial seawater (ASW) an increase in motility from 0.2 micron/min (absence of the ionophore) to 3.7 microns/min (presence of ionomycin). When the experiments were performed in Ca(2+)-free medium, no effect of ionomycin could be observed. In parallel experiments the changes of [Ca2+]i using the dye Fura-2 were measured. The experiments revealed that ion…
Changes of meaning due to changes of articles: A study of singular count nouns in post-verbal position in Italian
2009
'Essi fecero un muro' vs. 'Essi fecero muro': on the surface, these Italian sentences differ only for the presence of an article before the post-verbal noun (PVN) 'muro', literally 'wall'. Despite this minor divergence, their VPs vary greatly in meaning: the former can be rendered as 'They built a wall', the latter as 'They put up resistance'. In Italian, many other nouns behave as 'muro' does above. The meanings come from distinct structures: PVNs preceded by an article are direct objects. Bare PVNs, at times the very same noun, can either pass tests for direct object-hood or show distinct syntactic ties with the verb.