Secretion mechanisms of volatile organic compounds in specialized cells of aromatic plants

The present review focuses on cells secreting volatile odorant compounds. This cell type is found in a wide variety of plants, grouped under the term aromatic plants. Such secreting cells are very diverse in morphology, from highly specialized trichomes to nonspecialized cells, including the secretory epidermal cells of petals and osmophores. In these various types of cell, the biosynthetic pathways of three main groups of volatile organic compounds are recognized: isoprenoids, fatty acid derivatives and aromatic compounds. The precise cellular localization of these pathways has not yet been elucidated in all cases, though many of the enzymes involved have already been cloned. These have been found to be frequently located in plastids but also in endoplasmic reticulum or even cytosol. Two alternative mechanisms of secretion termed granulocrine and eccrine have been postulated to exist. Recent studies support the fact that both mechanisms could exist for different compounds and different plants. This review will discuss also the route by which secreted molecules make their way through the cell wall and cuticle

Bleustein-Blanchet Marcel, Les ondes 1934-1984

Mauriat Caroline. Bleustein-Blanchet Marcel, Les ondes 1934-1984. In: Vingtième Siècle, revue d'histoire, n°6, avril-juin 1985. pp. 177-178

Miquel Pierre, Histoire de la radio et de la television

Mauriat Caroline. Miquel Pierre, Histoire de la radio et de la television. In: Vingtième Siècle, revue d'histoire, n°7, juillet-septembre 1985. Étrangers, immigres, français, sous la direction de Louis Bodin . pp. 190-191

Miquel Pierre, Histoire de la radio et de la television

Mauriat Caroline. Miquel Pierre, Histoire de la radio et de la television. In: Vingtième Siècle, revue d'histoire, n°7, juillet-septembre 1985. Étrangers, immigres, français, sous la direction de Louis Bodin . pp. 190-191

Bleustein-Blanchet Marcel, Les ondes 1934-1984

Mauriat Caroline. Bleustein-Blanchet Marcel, Les ondes 1934-1984. In: Vingtième Siècle, revue d'histoire, n°6, avril-juin 1985. pp. 177-178

Dordhain Roland, Le roman de la radio

Mauriat Caroline. Dordhain Roland, Le roman de la radio. In: Vingtième Siècle, revue d'histoire, n°2, avril 1984. pp. 135-136

Dordhain Roland, Le roman de la radio

Mauriat Caroline. Dordhain Roland, Le roman de la radio. In: Vingtième Siècle, revue d'histoire, n°2, avril 1984. pp. 135-136

Pour une histoire de la radiodiffusion en France : essai bibliographique (1921-1945)

Mauriat Caroline, Méadel Cécile. Pour une histoire de la radiodiffusion en France : essai bibliographique (1921-1945). In: Bulletin de l'Institut d'Histoire du Temps Présent, n°10, décembre 1982. pp. 44-57

Ab initio study of oxygen point defects on tungsten trioxide surface

International audienceThe gas response of tungsten trioxide (WO 3) based sensors strongly depends on the surface properties. Reconstructed surfaces and oxygen point defects at the surface of the monoclinic WO 3 are studied using a self-consistent scheme based on first-principle. The oxygen vacancy is found to be the predominant defect independently of the oxygen partial pressure. Indeed, under rich oxygen atmosphere the formation enthalpies are found to be 1.45 eV in LDA (1.28 eV in GGA) for the oxygen vacancy instead of 2.70 eV (2.42 eV) for the oxygen adatom. When the oxygen partial pressure is lowered, the oxygen vacancy formation enthalpy decreases and becomes exothermic under very O-poor condition (-1.65 eV in LDA and-1.36 eV in GGA). On the other hand, the formation enthalpy of an oxygen adatom rises. Finally, the oxygen vacancy formation acts as a n–doping by introducing negative charge carriers at the bottom of the conduction band. All these results can be very helpful in order to explain the electrical resistivity measurements

Mechanism of CO and O3 sensing on WO3 surfaces: First principle study

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