Jordi Pericas Beltrán

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Enzymatically isolated vein networks from mature pea (Pisum sativum L. cv Alaska) leaves were employed to investigate the properties of sucrose loading and the effect of phytohormones and cell turgor on this process. The sucrose uptake showed two components: a saturable and a first-order kinetics system. The high affinity system (K(m), 3.3 millimolar) was(More)
The role and source of gibberellins (GAs) involved in the development of parthenocarpic fruits of Pisum sativum L. has been investigated. Gibberellins applied to the leaf adjacent to an emasculated ovary induced parthenocarpic fruit development on intact plants. The application of gibberellic acid (GA3) had to be done within 1 d of anthesis to be fully(More)
O objetivo deste estudo foi identificar os fatores percebidos por enfermeiras fumantes como facilitadores ao abandono do tabagismo, com o propósito de, posteriormente, elaborar intervenções de ajuda com maior especificidade para esse grupo. Foi realizado estudo qualitativo, por meio de entrevistas semiestruturadas, com 15 enfermeiras de cuidados primários à(More)
The (2-O)alpha-d-glucopyranoside of 1,2-propanediol and [U-(14)C]glucose were used as substrates in a reaction with almond beta-glucosidase, which resulted in the production of some (2-O)alpha-d-oligoglucosides of 1,2-propanediol. As its substrate, the beta-glucosidase preferred the glucoside isomer that rotates plane-polarized light to the right. Some of(More)
Protoplasts purified from mesocarp of nonpollinated pea (Pisum sativum L.) ovaries released acid invertase to the incubation medium. The association of the acid invertase with microsomal fractions, and the sensitivity to energy-metabolism inhibitors and to tunicamycin, indicated the secretory nature of the release process. In the presence of GA3 (10(More)
El objetivo de este trabajo fue identificar los factores percibidos por las enfermeras fumadoras como moduladores del cese tabáquico, con el fin de diseñar posteriormente intervenciones de ayuda con la máxima especificidad para este colectivo. Se realizó un estudio cualitativo mediante entrevista semiestructurada a 15 enfermeras fumadoras de atención(More)
Rhynchosporoside, a phytotoxic compound, has been isolated from cultures of Rhynchosporium secalis, the causal agent of scald disease of barley. The toxin is a cello-bioside of 1,2-propanediol. The compound may play some role in symptom expression because it was isolated from diseased plants in concentrations similar to those that could cause symptoms in(More)
The short-lived isotope(11)C (t1/2=20.4 min) has been used to study assimilate distribution in intact pea plants (Pisum sativum L.). Radiolabel was measured at the leaf fed with(11)CO2 (feed-leaf), at the ovary of the flower subtended by this leaf, and in shoot apex and roots of individual plants. Considerable(11)C-radiolabel was detected in the young(More)
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