TORRES RUEDA , Antonio Ildefonso

La división celular es un proceso complejo, mediante el cual a partir de una célula se originan dos células hijas que, en la mayoría de los casos, son idénticas entre sí e idénticas a la célula de donde proceden. Este proceso, especialmente en las células eucarióticas, implica cambios morfológicos y fisiológicos considerables, que incluyen el...

The cortical cytoskeleton of Paramecium is characterized by a complex, polarized and asymmetrical organization. In order to analyse the cortical development of Paramecium tetraurelia during the sexual process of conjugation, different antibodies have been used to follow the development of five cortical components: basal bodies, ciliary...

The ultrastructure of the cyst wall has been studied in severa! hypotrichous ciliates. In Oxytrichafallax (Grimes, 1973),Pleurotricha sp. (Matsusaka, 1976), Stylonychia mytilus (Walker et al., 1975), Gastrostyla steinii (Walker et al., 1980) and Laurentiella acuminata (Gutierrez et al., l 980), the cyst wall is composed of four layers called,...

Actin is a cytoskeletal protein that is ubiquitous in eukaryotes, hence the corresponding genes and proteins have been isolated from numerous organisms as different as animals, plants, fungi and protozoa. Several atomic models are available for the monomeric as well as the filamentous form, and more than 70 proteins that bind actin and control...

La distribution de PADN lors de la division macronucléaire du cilié hypotriche Laurentiella acuminata a été étudiée par cytophotométrie. Le degré moyen d'inégalité de la répartition de PADN entre cellules sceurs est 10,05 p. cent. Les différences de teneur en ADN sont plus grandes entre deux cellules tirées au sort qu'entre deux cellules...

U ltrastructural study of Urostyla grandis cysts shows that the cyst wall is constitued of three layers :a fibrous ectocyst, a structurally homogeneous endocyst and a granular layer that exhibits a dispersed granular or fibrillar structure. The maintenance of only a few kinetosomes and scattered bundles of subpellicular microtubules, and other...

The cortical morphogenesis of regeneration in Histriculus similis has been studied in this work at level of electronic microscopy. The first signs of the regeneration process become evident one hour after the treatment with urea. During the early steps of the cortical morphogenesis of regeneration, the oral primordium , paroral ciliation...

Método para la detección e identificación rápida de Bacillus cereus mediante la reacción en cadena de la polimerasa en tiempo real. El método comprende (i) preparar un conjunto de tubos conteniendo cada tubo una mezcla de reacción específica para la bacteria a detectar (B. cereus), (ii) programar un aparato para el control simultáneo de...

Se ha secuenciado un fragmento de un gen de la a-tubulina, amplificado por PCR, del cil iado hipotrico Histriculus cavicola. Este fragmento, de 1182 pb, contiene un codón de terminación (UAA) en la fase de lectura, que en otros ciliados hipotricos codifica la glutamina. La comparación de los genes de la cx-tubulina de varias clases de ciliados...

The pleiotropic phenotype of an auxotrophic purL mutant (SVQ295) of Sinorhizobium fredii HH103 has been investigated. SVQ295 forms colonies that are translucent, produce more slime and absorb less Congo red than those of wild-type strain HH103. SVQ295 did not grow in minimal medium unless the culture was supplemented with thiamin and adenine or...