Search results for "AROMA"
showing 10 items of 1006 documents
Analiza wpływu podstawników na aromatyczność pierścieni nitrowych i aminowych pochodnych karbazolu
2017
Przedmiotem przeprowadzonych badań była analiza wpływu podstawników na aromatyczność pierścieni pochodnych karbazolu. Związki te charakteryzują się dobrymi właściwościami optycznymi i fotoprzewodnictwem, stąd też są obiektem badań w inżynierii materiałowej. W pracy sprawdzono jak charakter elektronowy podstawnika, miejsce podstawienia oraz orientacja względem płaszczyzny pierścieni karbazolu ma wpływ na zmiany w n-elektronowej delokalizacji w obrębie całego układu karbazolu. Przeanalizowano podstawniki o charakterze elektrono-akceptorowym (-NO2) i elektrono-donorowym (-NH2) lokując je w pięciu pozycjach pierścienia karbazolowego w ułożeniu równoległym i prostopadłym. Na podstawie wartości i…
Occurrence and removal of organic pollutants in sewages and landfill leachates
2002
Sewages of different composition and the effluents of four sewage treatment plants (STPs), plus sewage sludges were analysed for semivolatile organic priority pollutants. Furthermore, 11 landfill leachates were analysed to evaluate their contribution to sewage pollutants when co-treated. Bis(2-ethylhexyl) phthalate (DEHP) was the pollutant occurring at highest concentrations (up to 122 microg/l) and it was present in all sewages and leachates; concentrations of other phthalates were usually below 17 microg/l. Some polycyclic aromatic hydrocarbons (PAH) (<1 microg/l) and 2,6-dinitrotoluene (< or =5.9 microg/l) were also present in many of the sewages and leachates. Phthalates were present in…
Efecto de los análogos de la GnRH sobre la expresión de la aromatasa en células de la granulosa de pacientes con endometriosis
2015
La aromatasa juega un papel fundamental en el establecimiento de la calidad ovocitaria, la cual puede estar alterada en las mujeres infértiles con endometriosis. Por otro lado, la administración prolongada de agonistas de GnRH previo a la fecundación in vitro en estas pacientes, ha demostrado que aumentaba la tasa de gestación aproximadamente cuatro veces. En este estudio se ha comparado la expresión del gen CYP19A1 ( que codifica a la aromatasa) en las células de la granulosa mural (CGM) y en las células de cúmulo (CC), los niveles de estradiol, testosterona y androstenediona en el líquido folicular, la calidad ovocitaria y embrionaria, y la tasa de fecundación de pacientes con endometrios…
Mechanisms involved in lipid accumulation and apoptosis induced by 1-nitropyrene in Hepa1c1c7 cells
2011
International audience; 1-Nitropyrene (1-NP) is a nitro-polycyclic aromatic hydrocarbon (nitro-PAH) present in diesel exhaust and bound to particular matter in urban air. We show that 1-NP and the referent PAH benzo(a)pyrene (BP) induce apoptosis and a lipid accumulation dependent on cytochrome P450 1A1-metabolites in mouse hepatoma cells, whereas 1-amino-pyrene had no effect. The caspase inhibitor, N-benzyloxycarbonyl-Val-Ala-Asp(O-Me) fluoromethyl ketone (Z-VAD-fmk), inhibits 1-NP-induced apoptosis, but failed to alter 1-NP-triggered lipid accumulation determined by Nile red staining. We further show that cholesterol and fatty acid contents are modified after nitro-PAH exposure and that 1…
Partition of volatile compounds in pea globulin–maltodextrin aqueous two-phase system
2014
International audience; This study is based on the assumption that the off-flavour of pea proteins might be decreased using the retention of volatile compounds by a mixture with another biopolymer. The partition of volatile compounds in an aqueous system containing pea protein and maltodextrins was followed under thermodynamic incompatibility conditions. Firstly, the phase diagram of the system was established. Then, the partition of aroma compounds between the phase rich in protein and the phase rich in maltodextrin was measured by SPME–GC–MS. There was a transfer of volatile compounds during phase separation. Variations of pH were also used to vary the retention of volatile compounds by p…
Candida antarctica Lipase A-Based Enantiorecognition of a Highly Strained 4-Dibenzocyclooctynol (DIBO) Used for PET Imaging
2020
The enantiomers of aromatic 4-dibenzocyclooctynol (DIBO), used for radiolabeling and subsequent conjugation of biomolecules to form radioligands for positron emission tomography (PET), were separated by kinetic resolution using lipase A from Candida antarctica (CAL-A). In optimized conditions, (R)-DIBO [(R)-1, ee 95%] and its acetylated (S)-ester [(S)-2, ee 96%] were isolated. In silico docking results explained the ability of CAL-A to differentiate the enantiomers of DIBO and to accommodate various acyl donors. Anhydrous MgCl2 was used for binding water from the reaction medium and, thus, for obtaining higher conversion by preventing hydrolysis of the product (S)-2 into the starting materi…
STUDY OF Β-GLUCOSIDASE IN CELLULAR AND ACELLULAR FORM FOR WINEMAKING APPLICATIONS
2005
Fantasia sarjakuvissa
2021
Goût et préférences du consommateur âgé
2017
Revue; Goût et préférences du consommateur âgé. Sixième journée mondiale de la déglutition :
Sorption kinetic of aroma compounds by edible bio-based films from marine-by product macromolecules: Effect of relative humidity conditions
2019
International audience; Edible films based on gelatin and chitosan have high gas and aroma barrier properties. This study focused on their capability to sorbed/retain aroma compounds (1-hexanal, 2-hexen-1-ol, 1-hexanol, 3-hexanone and phenol) at three relative humidity level (≤2%, 53% or 84% RH). Whatever the relative humidity condition, the order of sorption is keton (3-hexanone) < aldehyde (1-hexanal) < aliphatic alcohols (2-hexen-1-ol and 1-hexanol) < phenol. This order could be related to the intrinsic chemical properties of aroma compounds. The increase in moisture enhanced the sorption at the highest RH for all the aroma compounds. However, a competition between water and aliphatic al…