IPA-kyselylomake valinnoista ja osallistumisesta jokapäiväisessä elämässä. Toimintakyvyn itsearviointimenetelmä aikuisille, joilla on fyysisiä toimintarajoitteita

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The symbolization of central approximants in the IPA

Approximants that can be considered weaker versions of voiced fricatives (termed here ‘frictionless continuants’) are poorly served by the IPA in terms of symbolization as compared to semi-vowel approximants. In this paper we survey the central approximants and the symbols and diacritics used to transcribe them; we focus on evidence for the use of non-rhotic frictionless continuants in both natural language (by which we mean non-clinical varieties) and disordered speech; and we suggest some possible unitary symbols for those that currently require the use of a hard-to-read lowering diacritic beneath the symbol for the corresponding voiced fricative.

El proyecto de innovación de Amsterdam (IPA).

Se desarrolla el Proyecto de Innovación de Ámsterdam (IPA), llevado a cabo en 1971 con el objeto de disminuir los problemas que los hijos de los trabajadores experimentan en la enseñanza, y aumentar sus posibilidades de desarrollo. Su duración fue de siete años y en él participaron: juntas escolares, personal docente, alumnos y padres de escuelas de primaria y párvulos de barrios de trabajadores, el Centro de Asesoramiento para la Enseñanza en Ámsterdam y el Instituto de Investigación para la Psicología Aplicada. El IPA ofrece soluciones orientadas a cambios sociales y escolares. Especialmente se tratan los aspectos pedagógicos, dejando al margen las políticas a nivel urbano y nacional. Se desarrollan los medios, procedimientos y estructuras, utilizando las normas de investigación activa, con el fin de disminuir los problemas educativos de los hijos de los trabajadores.

Tabla g[ene]ral sobre tots los 13 libres, autor fray Fr[ancis]co Eximenez, natural de Gerona del Princ[ipa]do de Cataluña, religioso fran[cisca]no [Manuscrito]

Tít. tomado de principio del texto

The secreted Ipa complex of Shigella flexneri promotes entry into mammalian cells.

The bacterial pathogen Shigella flexneri causes bacillary dysentery in humans by invading coloncytes. Upon contact with epithelial cells, S. flexneri elicits localized plasma membrane projections sustained by long actin filaments which engulf the microorganism. The products necessary for Shigella entry include three secretory proteins: IpaB, IpaC, and IpaD. Extracellular IpaB and IpaC associate in a soluble complex, the Ipa complex. We have immunopurified this Ipa complex on latex beads and found that they were efficiently internalized into HeLa cells. Like S. flexneri entry, uptake of the beads bearing the Ipa complex was associated with membrane projections and polymerization of actin at the site of cell-bead interaction and was dependent on small Rho GTPases. These results indicate that a secreted factor can promote S. flexneri entry into epithelial cells.

Disulfide oxidoreductase activity of Shigella flexneri is required for release of Ipa proteins and invasion of epithelial cells.

Secretion of IpaB, IpaC, and IpaD proteins of Shigella flexneri, essential for the invasion of epithelial cells, requires a number of proteins encoded by the spa and mxi loci on the large plasmid. Introduction of dsbA::Tn5 into S.flexneri from Escherichia coli K-12 reduced invasiveness, which resulted from a decrease in the capacity to release IpaB, IpaC, and IpaD proteins into the external medium. Examination of the surface-presented Ipa proteins of the dsbA mutant, however, revealed Ipa proteins at levels similar to those on wild-type cells. Since the defective phenotype was similar to that of the spa32 mutant of S. flexneri and the Spa32 sequence possessed two Cys residues, the effect of dsbA mutation of the folding structure of Spa32 under reducing conditions and on the surface expression of Spa32 was investigated. The results indicated that Spa32 was a disulfide-containing protein whose correctly folded structure was required for its presentation on the outer membrane. Indeed, replacing either one of the two Cys residues in Spa32 with Ser by site-directed mutagenesis reduced its capacity to release Ipa proteins into the external medium and led to the accumulation of Spa32 protein in the periplasm. These results indicated that the DsbA protein performs an essential function during the invasion of mammalian cells, by facilitating transport of the Spa32 protein across the outer membrane.