Search results for "PC"

Quantification des Brettanomyces par qPCR

2017

International audience; Brettanomyces bruxellensis est une levure d’altération du vin avec de faibles besoins nutritionnels, résistante à l’éthanol et aux faibles pH, lui permettant une implantation en vin durant ou après la fermentation alcoolique (Conterno et al., 2006). B. bruxellensis est capable de produire des phénols volatils (éthyl-4-phénol, éthyl-4-gaïacol et éthyl-4-catéchol) (Oelofse et al., 2008). Ces molécules volatiles odorantes amènent un caractère phénolé et animal au vin connu sous le nom de « caractère Brett ». D’autres molécules (2-acétyltétrahydropyridine et 2-éthyltétrahydropyridine) produites par B. bruxellensis sont également responsables d’une déviation organoleptiqu…

Human neonates prefer colostrum to mature milk: Evidence for an olfactory bias toward the "initial milk"?

2021

International audience; OBJECTIVES: Colostrum is the initial milk secretion which ingestion by neonates warrants their adaptive start in life. Colostrum is accordingly expected to be attractive to newborns. The present study aims to assess whether colostrum is olfactorily attractive for 2-day-old newborns when presented against mature milk or a control. METHODS: The head-orientation of waking newborns was videotaped in three experiments pairing the odors of: (a) colostrum (sampled on postpartum day 2, not from own mother) and mature milk (sampled on average on postpartum day 32, not from own mother) (n tested newborns = 15); (b) Colostrum and control (water; n = 9); and (c) Mature milk and …

Giarraffa and Grossa di Spagna naturally fermented table olives: Effect of starter and probiotic cultures on chemical, microbiological and sensory tr…

2014

Abstract This work investigated on the effects of selected starters and of probiotic strains on the evolution of microbiota, on trend of volatile compounds and on the final sensorial traits of green table olives. The olives, belonging to Giarraffa and Grossa di Spagna cultivars, were processed according to Sicilian traditional method and the following samples were obtained: (1) un-inoculated spontaneous olives, control; (2) olives inoculated with probiotic Lactobacillus rhamnosus H25; (3) olives inoculated with commercial probiotic L. rhamnosus GG; (4) olives inoculated with Lactobacillus plantarum GC3 plus Lactobacillus paracasei BS21; and (5) olives inoculated with L. plantarum GC3 plus L…

Rapid differentiation, in situ detection and monitoring of sourdough lactobacilli from the Abruzzo region (central Italy)

2006

Sabiedrību uzvedība pieaugot saimnieciska darbības veicēju nodokļu noslodzei

2022

Pēc nodokļu slodzes pieauguma saimnieciskās darbības veicējiem sabiedrība ir neapmierināta ar situāciju, jo uzskata ka notiek neefektīva nodokļu palielināšana, lielāka daļa pašnodarbināto personu pārtrauc oficiālo saimniecisko darbību un palielina ēnu ekonomikas līmeni. Šīs darbs ar aptaujas palīdzību un valsts ekonomisko radītāju analīzi noskaidro patiesus apstākļus Latvijā. Tā pat tika noskaidrots, ka pašnodarbinātas personas apzinās, lieto un novērtē valsts pakalpojumus, kas tiek finansēti no nodokļiem. Pētījuma rezultāts noved pie secinājuma, ka palielinot efektīvi nodokļus un piedāvājot sabiedrībai sociālo aprūpi, brīvību un iespēju attīstīties palielinās sabiedrības laimes līmenis. Sa…

Dominique Hölzle. Le roman libertin au XVIIIe siècle: une esthétique de la séduction, Oxford, Voltaire Foundation, 2012, 285 pagine.

2018

Polysulfonate Cappings on Upconversion Nanoparticles Prevent Their Disintegration in Water and Provide Superior Stability in a Highly Acidic Medium

2018

The stability of organic cappings on hexagonal NaYF4:Ln3+ upconversion nanoparticles (UCNPs) is crucial for their luminescence efficiency in aqueous solutions. The capping removal quickens as the acidity of the medium increases. We demonstrate here that polysulfonates, namely poly(2-acrylamido-2-methyl-1-propanesulfonate) (PAMPS) and poly(sodium 4-styrene sulfonate) (PSS), remain anchored to the surface of NaYF4:Yb3+,Er3+/Tm3 UCNPs even at a pH as low as 2 due to strong acidity of the sulfonate anchoring groups (pKa of ca. −3). Bare UCNPs progressively disintegrate into their compositional F–, Na+, Y3+, and Ln3+ ions. Their disintegration is particularly worrying in highly diluted dispersio…

Multicolor upconversion luminescence of GdVO4:Ln3+/Yb3+ (Ln3+ = Ho3+, Er3+, Tm3+, Ho3+/Er3+/Tm3+) nanorods

2016

Lanthanide-doped GdVO4 nanorods that exhibit upconversion emission under 982 nm excitation have been prepared by a facile room-temperature chemical co-precipitation method followed by a subsequent annealing at temperatures of 600 degrees C, 800 degrees C and 1000 degrees C. Multicolor upconversion emission, including white, was achieved by tuning the concentrations of dopant lanthanide ions (Ho3+, Er3+, Tm3+ and Yb3+) in GdVO4. It is found that four GdVO4 samples emit light with the white chromaticity coordinates of (0.326, 0.339), (0.346, 0.343), (0.323, 0327) and (0.342, 0.340) respectively, under a single-wavelength NIR excitation. These coordinates are very close to the standard equal e…

Lanthanide-doped Y3Ga5O12 garnets for nanoheating and nanothermometry in the first biological window

2018

Abstract Absorption and luminescence spectra in the first biological window of Nd3+ single-doped and Er3+-Yb3+ co-doped Y3Ga5O12 nano-garnets have been studied to evaluate their potential use as simultaneous optical nanoheaters and nanothermometers in biomedicine. Nd3+-doped nano-garnets uses the 808 nm laser radiation, resonant with the largest absorption peak of the 4I9/2 → 4F5/2 transition, for both heating the nanoparticle and populating the 4F3/2 emitting level. Changes in the relative intensities of different emission peaks between Stark levels of the 4F3/2 (R1,2)→4I9/2 (Z1-5) transition can be directly related to the temperature of the nano-garnet. On the other hand, the Yb3+/Er3+com…

Hydrogen bond-mediated conjugates involving lanthanide diphthalocyanines and trifluoroacetic acid (Lnpc2@TFA): Structure, photoactivity, and stability

2020

The interaction between lanthanide diphthalocyanine complexes, LnPc2 (Ln = Nd, Sm, Eu, Gd, Yb, Lu