Search results for "multivariate"

A grape and wine chemodiversity comparison of different appellations in Burgundy: vintage vs terroir effects.

2013

Abstract This study aimed at assessing the ability of high resolution Fourier Transform Ion Cyclotron Resonance – Mass Spectrometry (FTICR–MS) to differentiate grapes and corresponding wines from distinct vineyards managed by a same producer, according to complex chemical fingerprints. Grape extracts (at harvest) and corresponding wines from four different vineyards, sampled immediately after the alcoholic fermentation over three successive vintages, were analysed by FTICR–MS. Thousands of metabolites that are specific to a given vintage, or a given class (wine, skin or must) could be revealed, thus emphasising a strong vintage effect. The same wines were reanalyzed after a few years in bot…

High precision mass measurements for wine metabolomics

2014

An overview of the critical steps for the non-targeted Ultra-High Performance Liquid Chromatography coupled with Quadrupole Time-of-Flight Mass Spectrometry (UPLC-Q-ToF-MS) analysis of wine chemistry is given, ranging from the study design, data preprocessing and statistical analyses, to markers identification. UPLC-Q-ToF-MS data was enhanced by the alignment of exact mass data from FTICR-MS, and marker peaks were identified using UPLC-Q-ToF-MS(2). In combination with multivariate statistical tools and the annotation of peaks with metabolites from relevant databases, this analytical process provides a fine description of the chemical complexity of wines, as exemplified in the case of red (P…

Reading performance and its developmental trajectories during the first and the second grade

2004

Abstract This study examined children’s reading performance and its developmental trajectories during the first and the second grade. Ninety children were tested five times on word reading and reading comprehension. Qualitatively different groups were identified through cluster analysis: Competent, Technical, and Poor Readers. The results showed that the group membership in the Competent and Technical Reader groups was relatively stable across time but less so for the Poor Reader group. Moreover, seven reading paths were identified of which three were comparatively regressive paths. The results emphasize the importance of taking into account individual variation in reading trajectories duri…

Differential activation of neural networks in an odor recognition task: an event-related fMRI study

2010

Differential activation of neural networks in an odor recognition task: an event-related fMRI study. 32. Annual meeting (AChemS)

Terahertz Biomedical Imaging: From Multivariate Analysis and Detection to Material Parameter Extraction

2017

Terahertz imaging is an interesting route for biomedical analysis. In particular, cancer imaging is a subject of study for different teams [1,2]. A work is done in Bordeaux in partnership with a hospital to do terahertz analysis of breast tissue. This work is done in reflection with time domain imaging setup with fresh samples. The aim is to accurately assess tumor margins and which could in the future allow a quick validation of the precision of the surgical procedure and know if new surgery should be performed. We have presented in a previous paper [3] the use of automatic methods of image generation with different parameters [4] in order to explore the different contrasts that exist in t…

Factors related to the relative survival of patients with diffuse large B-cell lymphoma in a population-based study in France: does socio-economic st…

2017

IF 7.702; International audience; The survival of patients with diffuse large B-cell lymphoma has increased during the last decade as a result of addition of anti-CD20 to anthracycline-based chemotherapy. Although the trend is encouraging, there are persistent differences in survival within and between the USA and European countries suggesting that non-biological factors play a role. Our aim was to investigate the influence of such factors on relative survival of patients with diffuse large B-cell lymphoma. We conducted a retrospective, multicenter, registry-based study in France on 1165 incident cases of diffuse large B-cell lymphoma between 2002 and 2008. Relative survival analyses were p…

Archéophytes et néophytes.Pour une nouvelle détermination des marqueurs polliniques de l'anthropisation. Le cas des milieux cultivés et rudéraux de F…

2007

297p. de synthèse, annexes p.299-414, 15 articles en soumission Diplôme : Dr. d'Universite

Sensory analysis of Burgundy Pinot noir wines: A comparison of orthonasal and retronasal profiling

1999

Thirty Burgundy Pinot noir wines were evaluated by quantitative descriptive profile by nose (BN) and by mouth (BM) separately, by a trained panel composed of 12 judges. A specific vocabulary of 20 terms was developed. Sensory results were analyzed and compared by univariate and multivariate statistical techniques. Principal component analyses of the mean ratings BN and BM were fairly comparable regarding correlation among variables and the position of the wines. However, five sensory characteristics seem to be more intensely perceived BM, against 6 BN. Panel discrimination of the wines and panel repeatability in the measure were found to be slightly better BN than BM. A further canonical di…

Multivariate approaches to behavioral physiology

2017

Bienestar Subjetivo de los Adolescentes: Un Estudio Comparativo entre Argentina y Brasil

2012

ResumenEl objetivo del presente estudio es conocer y comparar los niveles de bienestar subjetivo de adolescentes argentinos y brasileños. La muestra está compuesta por 640 adolescentes de ambos sexos con edades entre los 12 y 16 años, siendo el 46.3% argentinos y el 53.7% brasileños. Se han utilizado tres escalas: el Personal Wellbeing Index (PWI), la Satisfaction with Life Scale (SWLS) y la Brief Multidimensional Students’ Life Satisfaction Scale (BMSLSS). El PWI y la BMSLSS mostraron puntuaciones más altas en los adolescentes argentinos (MPWI=82.42y MBMSLSS=41.19) que en los brasileños (MPWI=80.88y MBMSLSS=40.09), y mientras que la SWLS mostró resultados semejantes (MSWLS-Arg=31.50y MSWLS…