Biguanide-, imine-, and guanidine-based networks as catalysts for transesterification of vegetable oil

Polycationic systems based on poly(hexamethylene biguanide) (PHMBG), branched polyethyleneimine (PEI) and poly(N-vinylguanidine) (PVG) have been evaluated as heterogeneous catalysts for the transesterification of sunflower oil by methanol. Insoluble networks are synthesized via cross-linking of PHMBG by either 4,4′-methylenebis(N,N-diglycidylaniline) or polyisocyanate prepolymer, PEI with sebacoyl chloride, and PVG with 1,4-butanediol diglycidyl ether. PHMBG and its cross-linked networks appeared to be remarkably efficient catalysts, enabling 80–100% triglyceride conversion within 0.5 h at 70 °C. PEI-based networks catalyzed triglyceride transesterification with rates 8- to 12-fold slower than their PHMBG-based counterparts. The PVG-based networks, which were devoid of hydrophobic moieties, appeared to be inefficient catalysts due to limited accessibility of the basic guanidine groups to reactants. The PHMBG networks were shown to be recyclable by a simple centrifugal filtration. After 15 cycles of recovery and reuse, only 10–15% decline in performance was observed.National Center for Research Resources (Puerto Rico) (Grant P20 RR016470)National Center for Research Resources (Puerto Rico) (Grant S06 GM-08216)National Center for Research Resources (Puerto Rico) (Grant GM-08102

Construire au-delà de la Méditerranée

Suez, Abou Simbel, Le Caire, Alger, Casablanca, Istanbul... Pour la première fois, des historiens de l'architecture et des conservateurs d'archives nous permettent d'accéder à un patrimoine culturel européen exceptionnel et méconnu : les archives produites par les entreprises du bâtiment et des travaux publics actives au sud de la Méditerranée, entre 1860 et 1970. Ouvrages d'art en acier ou béton armé, cités pour ouvriers et cadres expatriés, bâtiments publics mais aussi mobilier, décors, ouvrages effectués par des artisans d'art... Toutes ces réalisations témoignent d'une époque d'intenses échanges humains, techniques, et artistiques entre l'Europe et l'arc sud-est de la Méditerranée. Photographies anciennes destinées à promouvoir le travail des entrepreneurs, photographies de chantier, dessins d'architectes, croquis et carnets documentant les innovations techniques, plaquettes publicitaires... le livre est illustré par plus de 200 dessins et photographies provenant directement des fonds d'archives des constructeurs. Cet ouvrage est le résultat du projet de coopération transnationale "ARCHING : ARchives d'INGénierie européenne" (2010-2012) conduit dans le cadre du programme Culture 2007-2013 de la Commission européenne, auquel ont participé cinq institutions : l'Ecomusée du Bois-du-Luc (Belgique), la Cité de l'architecture et du patrimoine (France), InVisu (CNRS-INHA) (France), le Dipartimento di Architettura disegno-storia-progetto de l'université de Florence (Italie), Archmuseum (Turquie).Suez, Abu Simbel, Cairo, Algiers, Casablanca, Istanbul... This work of pioneering research by architectural historians and archivists gives us access to an exceptional field of European cultural heritage: the records of buildings and public works contractors active on the southern shores of the Mediterranean between 1860 and 1970. It covers all the construction trades, from steel or reinforced concrete bridges and dams, housing for laborers and expats, and public buildings, but also furniture, decoration, and studio crafts. All of these projects attest to the intensity of the human, technical, and artistic exchanges occurring in this period between Europe and the south-eastern Mediterranean rim. This book is illustrated with over 200 rare drawings and photographs drawn directly from the builders'archives, including old photos intended to promote the contractor's business, construction site photos, architects' plans, sketches, and notes documenting technical innovations, and vintage advertising brochures, etc. This book is the product of the transnational cooperation project "ARCHING: ARChives d'INGénierie européennes" (2010-2012) carried out as part of the European Commission Culture Programme 2007-2013, in conjunction with five institutions: the Ecomusée du Bois-du-Luc (Belgium), the Cité de l'architecture et du patrimoine (France), InVisu (CNRS-INHA) (France), the Dipartimento di Architettura disegno-storia-progetto of the University of Florence (Italy) and the Archmuseum (Turkey)

Building Beyond The Mediterranean

Suez, Abu Simbel, Cairo, Algiers, Casablanca, Istanbul... This work of pioneering research by architectural historians and archivists gives us access to an exceptional field of European cultural heritage: the records of buildings and public works contractors active on the southern shores of the Mediterranean between 1860 and 1970. It covers all the construction trades, from steel or reinforced concrete bridges and dams, housing for laborers and expats, and public buildings, but also furniture, decoration, and studio crafts. All of these projects attest to the intensity of the human, technical, and artistic exchanges occurring in this period between Europe and the south-eastern Mediterranean rim. This book is illustrated with over 200 rare drawings and photographs drawn directly from the builders'archives, including old photos intended to promote the contractor's business, construction site photos, architects' plans, sketches, and notes documenting technical innovations, and vintage advertising brochures, etc. This book is the product of the transnational cooperation project "ARCHING: ARChives d'INGénierie européennes" (2010-2012) carried out as part of the European Commission Culture Programme 2007-2013, in conjunction with five institutions: the Ecomusée du Bois-du-Luc (Belgium), the Cité de l'architecture et du patrimoine (France), InVisu (CNRS-INHA) (France), the Dipartimento di Architettura disegno-storia-progetto of the University of Florence (Italy) and the Archmuseum (Turkey).Suez, Abou Simbel, Le Caire, Alger, Casablanca, Istanbul... Pour la première fois, des historiens de l'architecture et des conservateurs d'archives nous permettent d'accéder à un patrimoine culturel européen exceptionnel et méconnu : les archives produites par les entreprises du bâtiment et des travaux publics actives au sud de la Méditerranée, entre 1860 et 1970. Ouvrages d'art en acier ou béton armé, cités pour ouvriers et cadres expatriés, bâtiments publics mais aussi mobilier, décors, ouvrages effectués par des artisans d'art... Toutes ces réalisations témoignent d'une époque d'intenses échanges humains, techniques, et artistiques entre l'Europe et l'arc sud-est de la Méditerranée. Photographies anciennes destinées à promouvoir le travail des entrepreneurs, photographies de chantier, dessins d'architectes, croquis et carnets documentant les innovations techniques, plaquettes publicitaires... le livre est illustré par plus de 200 dessins et photographies provenant directement des fonds d'archives des constructeurs. Cet ouvrage est le résultat du projet de coopération transnationale "ARCHING : ARchives d'INGénierie européenne" (2010-2012) conduit dans le cadre du programme Culture 2007-2013 de la Commission européenne, auquel ont participé cinq institutions : l'Ecomusée du Bois-du-Luc (Belgique), la Cité de l'architecture et du patrimoine (France), InVisu (CNRS-INHA) (France), le Dipartimento di Architettura disegno-storia-progetto de l'université de Florence (Italie), Archmuseum (Turquie)

Monitoring the oxidation of docosahexaenoic acid in lipids

The oxidation of free DHA, DHA mixed with PC, and DHA incorporated into PC, PE, or TG was evaluated to determine which lipid provided DHA with the best protection against oxidation. DHA was either situated at the sn-1 position, sn-2 position, or both positions of the phospholipid, whereas the TG contained DHA at all positions. All lipids were incubated as bulk lipids, in chloroform, or as an emulsion in contact with air at 25-30 degrees C for 28 d. Since DHA, which is highly sensitive to oxidation, has a great impact on our health and is desired as a food additive, the stability of this FA is of great importance. This study was mainly focused on the primary oxidation products, which were monitored as eight monohydroperoxy-DHA isomer groups, the total amount of polyhydroperoxides, and the PV. However, a measure of secondary oxidation products, the carbonyl value, was also monitored. We found that DHA was most protected against hydroperoxide formation when it was incorporated at one position of either PC or PE. In these lipids, hydroperoxide formation at carbon atoms 4, 7, 8, and 11 was completely prevented. DHA mixed with PC was also protected, although to a lesser extent, and all hydroperoxide isomers were detected. In contrast, PC and TG containing DHA at all positions should be avoided, since they were highly oxidized

Cineradiographic study of spine during cycling: Effects of changing the pedal unit position on the dorso-lumbar spine angle [Studio cineradiografico della colonna nell'attività ciclistica: Variazioni angolari del tratto di rachide dorso-lombare nelle modificazioni della posizione della pedaliera]

Purpose. Low back pain is a frequent pathology among bicyclists, probably due to unappropriate saddle position. This radiographic study was conducted to evaluate dorso-lumbar angular values in two different pedal unit positions; the first one in a bicycle frame type with pedals in front of the saddle axis and the second one with the pedals behind the saddle axis, in order to define the most physiological sitting position. Materials and methods. Ten voluntary healthy adults, ranging in age between 21 to 45 years, were randomly choosen among a group of cyclist not involved in competition and underwent serial fluoroscopic studies while cyclists sit on two different saddles of a prototype cyclette; dorso-lumbar angles at both different sitting positions were measured on film according to modified Lippmann-Cobb method using as reference the upper somatic limitant of the eleventh or twelth dorsal vertebra and the lower somatic limitant of the third lumbar vertebra. Results. Statistical analysis of the measured angles demonstrates that the differences between the dorso-lumbar spine angle in the different saddle positions are statistically significative with a coefficient correlation equals to 0.64015 and p>0.01; angular values are more physiological in the second position with pedal unit behind the saddle axis. Conclusions. The incidence and importance of low back pain in cyclists can be reduced with appropriate pedal unit position; the position with pedals behind the saddle axis permits more physiological spine angles in comparison with the classic one having the pedals in front of the saddle axis; this fact is due to a different pelvic position which coincides with lumbar angles

Inhibitors of Urokinase Type Plasminogen Activator and Cytostatic Activity from Crude Plants Extracts

molecule

Ingénieries innovantes ?

L’objectif de ce numéro est double. Il entend d’une part mettre en lumière la richesse des ressources offertes par les archives d’entreprises conservées en Europe pour l’étude des architectures européennes « hors les murs », dans la lignée d’une première exploration de fonds d’archives engagée à l’occasion du projet européen Building beyond the Mediterranean: Studying the archives of European businesses, 1860-1970 (Claudine Piaton, Ezio Godoli, David Peyceré, 2012). Il vise d’autre part à examiner les types de techniques et de savoir-faire exportés par les entreprises européennes afin de contribuer au débat autour de la question de l’innovation : les territoires extra européens ont-ils constitués des laboratoires dans lesquels étaient testées de nouvelles techniques de construction ou bien permettaient-ils simplement de diffuser à grande échelle celles déjà utilisées en Europe