Search results for "PPE"
showing 10 items of 5871 documents
Catalytic reduction of nitrates and nitrites in water solution on pumice-supported Pd–Cu catalysts
2000
Abstract Two series of pumice-supported palladium and palladium–copper catalysts, prepared by impregnation with different palladium and copper precursors, were tested for the hydrogenation of aqueous nitrate and nitrite solutions. Measurements were performed in a stirred tank reactor, operating in batch conditions, in buffered water solution at atmospheric pressure and at 293 K. The activities of the catalysts were calculated in terms of nitrate and/or nitrite removal. With the monometallic Pd/pumice, the reduction of nitrite is highly selective; only 0.2% of the initial nitrite content is converted to ammonium ions. The activity in terms of turn over frequency (TOF) is higher as compared t…
ChemInform Abstract: Synthesis and Magnetic Properties of Bis(μ-hydroxo)bis((2,2′-bipyridyl)copper(II)) Squarate. Crystal Structure of Bis(μ-hydroxo)…
1990
Abstract The compound [Cu2(bipy)2(OH)2](C4O4)·5.5H2O, where bipy and C4O42− correspond to 2,2′-bipyridyl and squarate (dianion of 3,4-dihydroxy-3-cyclo- butene-1,3-dione) respectively, has been synthesized. Its magnetic properties have been investigated in the 2–300 K temperature range. The ground state is a spin-triplet state, with a singlet-triplet separation of 145 cm−1. The EPR powder spectrum confirms the nature of the ground state. Well-formed single crystals of the tetrahydrate, [Cu2(bipy)2(OH)2](C4O4)·4H2O, were grown from aqueous solutions and characterized by X-ray diffraction. The system is triclinic, space group P 1 , with a = 9.022(2), b = 9.040(2), c = 8.409(2) A, α = 103.51(2…
Temporal aspects of copper homeostasis and its crosstalk with hormones
2015
To cope with the dual nature of copper as being essential and toxic for cells, plants temporarily adapt the expression of copper homeostasis components to assure its delivery to cuproproteins while avoiding the interference of potential oxidative damage derived from both copper uptake and photosynthetic reactions during light hours. The circadian clock participates in the temporal organization of coordination of plant nutrition adapting metabolic responses to the daily oscillations. This timely control improves plant fitness and reproduction and holds biotechnological potential to drive increased crop yields. Hormonal pathways, including those of abscisic acid, gibberellins, ethylene, auxin…
The role of post-transcriptional modulators of metalloproteins in response to metal deficiencies
2021
Copper and iron proteins play a wide range of functions in living organisms. Metal assembly into metalloproteins is a complex process, where mismetalation is detrimental and energy-consuming to cells. Under metal deficiency, metal distribution is expected to reach a metalation ranking, prioritizing essential versus dispensable metalloproteins, while avoiding interferences with other metals and protecting metal-sensitive processes. In this review, we propose that posttranscriptional Modulators of Metalloprotein messenger RNA (ModMeR) are good candidates in metal prioritization under metal-limited conditions. ModMeR target high quota or redundant metalloproteins and, by adjusting their synthe…
Comparison of global responses to mild deficiency and excess copper levels in Arabidopsis seedlings
2013
[EN] Copper is an essential micronutrient in higher plants, but it is toxic in excess. The fine adjustments required to fit copper nutritional demands for optimal growth are illustrated by the diverse, severe symptoms resulting from copper deficiency and excess. Here, a differential transcriptomic analysis was done between Arabidopsis thaliana plants suffering from mild copper deficiency and those with a slight copper excess. The effects on the genes encoding cuproproteins or copper homeostasis factors were included in a CuAt database, which was organised to collect additional information and connections to other databases. The categories overrepresented under copper deficiency and copper e…
La compétence du juge de droit commun pour sanctionner la mauvaise exécution par l'institution d'arbitrage du contrat d'organisation de l'arbitrage
2019
International audience; (Civ. 1re, 13 déc. 2017, n° 16-22.131, D. 2018. 18 ; ibid. 2448, obs. T. Clay ; Rev. arb. 2018. 370, note V. Chantebout, Soc. Projet Pilote Garoubé c/ Chambre de commerce internationale)
L'accès du plaideur impécunieux à la justice arbitrale
2019
International audience; (Civ. 1re, 17 oct. 2018, n° 17-21.411, FD, Soc. Youstina moda c/ Soc. Marex SPA, D. 2018. 2448, obs. T. Clay)
Le contrôle en fait et en droit par le juge de l'annulation de la sentence dont il est prétendu qu'elle donne effet à un contrat obtenu par corruption
2015
International audience; (Paris, pôle 1, chambre 1, 4 novembre 2014, SAS Man Diesel § Turbo France c/ Société AL Maimana General trading Company Limited, inédit)
Arbitrage international. Clause compromissoire prévoyant expressément un appel de la sentence arbitrale devant la cour d'appel, Sentence rendue en Fr…
1995
International audience; (Paris, 27 oct. 1994, Société De Diseno c/ Mendes, inédit)
Le contrôle par le juge de l'annulation en fait et en droit du respect de l'ordre public par les sentences arbitrales
2020
International audience; (Paris 27 sept. 2016, n° 15/12614, SA Ancienne Maison Marcel Bauche c/ Indagro, Rev. arb. 2017. 942 ; Paris 21 févr. 2017, n° 15/01650, République du Kirghizstan c/ M. Belokon, D. 2017. 2054, obs. L. d'Avout et S. Bollée ; ibid. 2559, obs. T. Clay ; RTD com. 2019. 42, obs. E. Loquin ; Rev. arb. 2017. 915, note S. Bollée et M. Audi ; Paris 10 avr. 2018, n° 16/11182, Sté Alstom transport SA c/ Sté Alexandre Brothers Ltd, Rev. arb 2018. 574, note E. Gaillard ; D. 2018. 1934, obs. L. d'Avout, spéc. 1942 ; Paris 21 mars 2017, n° 15/17234, Min. yéménite du pétrole et des minerais c/ Sté Alkor Petroo Ltd et a., Rev. arb. 2018. 587, note P. de Vareilles-Sommières ; Paris 16 …