12 research outputs found

    The Transcriptional Control of Iron Homeostasis in Plants: A Tale of bHLH Transcription Factors?

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    Iron is one of the most important micronutrients in plants as it is involved in many cellular functions (e.g., photosynthesis and respiration). Any defect in iron availability will affect plant growth and development as well as crop yield and plant product quality. Thus, iron homeostasis must be tightly controlled in order to ensure optimal absorption of this mineral element. Understanding mechanisms governing iron homeostasis in plants has been the focus of several studies during the past 10 years. These studies have greatly improved our understanding of the mechanisms involved, revealing a sophisticated iron-dependent transcriptional regulatory network. Strikingly, these studies have also highlighted that this regulatory web relies on the activity of numerous transcriptional regulators that belong to the same group of transcription factors (TF), the bHLH (basic helix-loop-helix) family. This is best exemplified in Arabidopsis where, to date, 16 bHLH TF have been characterized as involved in this process and acting in a complex regulatory cascade. Interestingly, among these bHLH TF some form specific clades, indicating that peculiar function dedicated to the maintenance of iron homeostasis, have emerged during the course of the evolution of the green lineage. Within this mini review, we present new insights on the control of iron homeostasis and the involvement of bHLH TF in this metabolic proces

    Smearing of soft cheese with Enterococcus faecium WHE 81, a multi-bacteriocin producer, against Listeria monocytogenes

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    International audienceEnterococcus faeciumWHE 81, a multi-bacteriocin producer, was tested for its antimicrobial activity onListeria monocytogenesin Munster cheese, a red smear soft cheese. The naturally delayed and superficialcontamination of this type of cheese allowed the use ofE. faeciumWHE 81 at the beginning of theripening as a surface culture. A brine solution inoculated at 105CFU ofE. faeciumWHE 81 per mL wassprayed on the cheese surface during the first smearing operation. On day 7, smearing of cheese sampleswith a brine solution at 102CFU ofL. monocytogenesper mL yielded initial cell counts of approximately50 CFU g1of the pathogen on the cheese surface. Although, in some instances,L. monocytogenescouldsurvive (<50 CFU g1) in the presence ofE. faeciumWHE 81, it was unable to initiate growth. In controlsamples however,L. monocytogenescounts often exceeded 104CFU g1. In other respects,E. faeciumWHE81, which naturally existed in Munster cheese, did not adversely impact on the ripening proces

    Pictavia Aurea

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    Este volumen, titulado Pictavia aurea, reúne 131 estudios que constituyen una granada muestra de los debates y las presentaciones en torno a la cultura hispánica del Siglo de Oro que entre los días 11 y 15 de julio de 2011 se dieron en la ciudad de Poitiers (Francia) en el marco del IX congreso de la Asociación Internacional “Siglo de Oro”. Auspiciada por la Universidad de Poitiers, a través del Centro de Estudios de la Literatura española de Entre Siglos (siglos xvii-xviii) (CELES XVII-XVIII) y el laboratorio «Formes et Représentations en Linguistique et Littérature» (FoReLL), la convocatoria reunió en la ciudad francesa a 276 participantes y a un centenar de asistentes en la novena edición del Congreso de la Asociación, que celebró entonces la efeméride del 450o aniversario del nacimiento de Luis de Góngora.A Isaías Lerner, maestro de la filología hispánic
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